The Open Biomedical Engineering Journal




ISSN: 1874-1207 ― Volume 13, 2019
RESEARCH ARTICLE

Amyloid-Negative Dementia in the Elderly is Associated with High Accumulation of Tau in the Temporal Lobes



Jun Takeuchi1, Takayuki Kikukawa1, Haruna Saito1, Itsuki Hasegawa1, Akitoshi Takeda1, Hiroyuki Hatsuta1, Joji Kawabe2, Yasuhiro Wada3, Aya Mawatari3, Ami Igesaka3, Hisashi Doi3, Yasuyoshi Watanabe3, Hitoshi Shimada4, Soichiro Kitamura4, Makoto Higuchi4, Tetsuya Suhara4, Yoshiaki Itoh1, *
1 Department of Neurology, Osaka City University Graduate School of Medicine, Asahimachi 1-4-3, Abenoku, Osaka, japan
2 Department of Nuclear Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
3 RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
4 Department of Functional Brain Imaging Research (DOFI), Clinical Research Cluster, National Institute of Radiological Sciences (NIRS), National Institutes for Quantum and Radiological Science and Technology (QST), Chiba, Japan

Abstract

Background:

We previously reported that among cases clinically diagnosed with Alzheimer’s disease, the proportion of amyloid beta (Aβ) -negative case increases in the elderly population. Tauopathy including Argyrophilic Grain Disease (AGD) and Neurofibrillary Tangle-Predominant Dementia (NFTPD), may be the leading causes of such dementia.

Objective:

To evaluate the involvement of tau, we studied tau accumulation in Amyloid-Negative Dementia Cases in the Elderly (ANDE) with Positron Emission Tomography (PET).

Methods:

Seven cases with slowly progressive dementia who were older than 80 years and were negative for Aβ were studied. In one case, autopsy obtained 2 years after the PET examination revealed neurofibrillary tangles limited around the parahippocampal gyrus. Four cases showed strong laterality in magnetic resonance imaging atrophy (clinical AGD), while the other three cases had no significant laterality in atrophy (clinical NFTPD). Age-corrected PET data of healthy controls (HC; n = 12) were used as control. Tau accumulation was evaluated with [11C]PBB3-PET.

Results:

High accumulation was found in the lateral temporal cortex in ANDE. In autopsy case, scattered neurofibrillary tangles were found in the parahippocampal gyrus. In addition, there was a very high accumulation of PBB3 in the large area of bilateral parietal lobes, although no corresponding tau component was found in the autopsied case.

Conclusion:

Relatively high burden of tau deposition was commonly observed in the lateral temporal cortex and parietal cortex of ANDE, part of which may explain dementia in these subjects. [11C]PBB3 may be useful in detecting tauopathy in ANDE.

Keywords: Amyloid PET, [11C]PBB3, Dementia, Elderly, Positron Emission Tomography, Tau PET.


Article Information


Identifiers and Pagination:

Year: 2019
Volume: 13
First Page: 55
Last Page: 66
Publisher Id: TOBEJ-13-55
DOI: 10.2174/1874120701913010055

Article History:

Received Date: 04/12/2018
Revision Received Date: 02/03/2019
Acceptance Date: 10/03/2019
Electronic publication date: 28/03/2019
Collection year: 2019

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© 2019 Takeuchi et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address correspondence to this author at the Department of Neurology, Osaka City University Graduate School of Medicine, Asahimachi 1-4-3, Abenoku, Osaka, Japan; Tel: +81666465599; Email: y-itoh@med.osaka-cu.ac.jp




1. INTRODUCTION

Alzheimer’s Disease (AD) is the leading cause of dementia, and the prevalence of clinically diagnosed AD nearly doubles for every 5 years for those older than 65 years [1T. Ohara, J. Hata, D. Yoshida, N. Mukai, M. Nagata, T. Iwaki, T. Kitazono, S. Kanba, Y. Kiyohara, and T. Ninomiya, "Trends in dementia prevalence, incidence, and survival rate in a Japanese community", Neurology, vol. 88, no. 20, pp. 1925-1932.[http://dx.doi.org/10.1212/WNL.0000000000003932] [PMID: 28424 272] -4B. Winblad, P. Amouyel, S. Andrieu, C. Ballard, C. Brayne, H. Brodaty, A. Cedazo-Minguez, B. Dubois, D. Edvardsson, H. Feldman, L. Fratiglioni, G.B. Frisoni, S. Gauthier, J. Georges, C. Graff, K. Iqbal, F. Jessen, G. Johansson, L. Jönsson, M. Kivipelto, M. Knapp, F. Mangialasche, R. Melis, A. Nordberg, M.O. Rikkert, C. Qiu, T.P. Sakmar, P. Scheltens, L.S. Schneider, R. Sperling, L.O. Tjernberg, G. Waldemar, A. Wimo, and H. Zetterberg, "Defeating Alzheimer’s disease and other dementias: A priority for European science and society", Lancet Neurol., vol. 15, no. 5, pp. 455-532.[http://dx.doi.org/10.1016/S1474-4422(16)00062-4] [PMID: 26987 701] ]. Most of the epidemiological reports are based on the clinical diagnosis of dementia, such as using the criteria from the Diagnostic and Statistical Manual of Mental Disorders (third and fourth editions) and the National Institute of Neurological and Communicative Disorders and Stroke and the Alzheimer’s disease and Related Disorders Association [1T. Ohara, J. Hata, D. Yoshida, N. Mukai, M. Nagata, T. Iwaki, T. Kitazono, S. Kanba, Y. Kiyohara, and T. Ninomiya, "Trends in dementia prevalence, incidence, and survival rate in a Japanese community", Neurology, vol. 88, no. 20, pp. 1925-1932.[http://dx.doi.org/10.1212/WNL.0000000000003932] [PMID: 28424 272] , 5M. Yamada, H. Sasaki, Y. Mimori, F. Kasagi, S. Sudoh, J. Ikeda, Y. Hosoda, S. Nakamura, and K. Kodama, "Prevalence and risks of dementia in the Japanese population: RERF’s adult health study Hiroshima subjects", J. Am. Geriatr. Soc., vol. 47, no. 2, pp. 189-195.[http://dx.doi.org/10.1111/j.1532-5415.1999.tb04577.x] [PMID: 9988 290] -8G.M. McKhann, D.S. Knopman, H. Chertkow, B.T. Hyman, C.R. Jack Jr, C.H. Kawas, W.E. Klunk, W.J. Koroshetz, J.J. Manly, R. Mayeux, R.C. Mohs, J.C. Morris, M.N. Rossor, P. Scheltens, M.C. Carrillo, B. Thies, S. Weintraub, and C.H. Phelps, "The diagnosis of dementia due to Alzheimer’s disease: Recommendations from the National Institute on Aging-Alzheimer’s Association workgroups on diagnostic guidelines for Alzheimer’s disease", Alzheimers Dement., vol. 7, no. 3, pp. 263-269.[http://dx.doi.org/10.1016/j.jalz.2011.03.005] [PMID: 21514250] ].

Table 1
Demographic data on cases with dementia in the elderly and healthy controls.


Compared with the pathological diagnosis, the specificity of these clinical criteria ranges from 44.3% to 70.8% [8G.M. McKhann, D.S. Knopman, H. Chertkow, B.T. Hyman, C.R. Jack Jr, C.H. Kawas, W.E. Klunk, W.J. Koroshetz, J.J. Manly, R. Mayeux, R.C. Mohs, J.C. Morris, M.N. Rossor, P. Scheltens, M.C. Carrillo, B. Thies, S. Weintraub, and C.H. Phelps, "The diagnosis of dementia due to Alzheimer’s disease: Recommendations from the National Institute on Aging-Alzheimer’s Association workgroups on diagnostic guidelines for Alzheimer’s disease", Alzheimers Dement., vol. 7, no. 3, pp. 263-269.[http://dx.doi.org/10.1016/j.jalz.2011.03.005] [PMID: 21514250] -10P.T. Nelson, E. Head, F.A. Schmitt, P.R. Davis, J.H. Neltner, G.A. Jicha, E.L. Abner, C.D. Smith, L.J. Van Eldik, R.J. Kryscio, and S.W. Scheff, "Alzheimer’s disease is not “brain aging”: Neuropathological, genetic, and epidemiological human studies", Acta Neuropathol., vol. 121, no. 5, pp. 571-587.[http://dx.doi.org/10.1007/s00401-011-0826-y] [PMID: 21516511] ]. Novel fluid and imaging biomarkers to detect amyloid β (Aβ) and tau are known to increase the accuracy of the diagnosis of dementia [11A.D. Henriques, A.L. Benedet, E.F. Camargos, P. Rosa-Neto, and O.T. Nóbrega, "Fluid and imaging biomarkers for Alzheimer’s disease: Where we stand and where to head to", Exp. Gerontol., vol. 107, pp. 169-177.[http://dx.doi.org/10.1016/j.exger.2018.01.002] [PMID: 29307736] -14C. Ritchie, N. Smailagic, A.H. Noel-Storr, Y. Takwoingi, L. Flicker, S.E. Mason, and R. McShane, "Plasma and cerebrospinal fluid amyloid beta for the diagnosis of Alzheimer’s disease dementia and other dementias in people with mild cognitive impairment (MCI)", Cochrane Database Syst. Rev., no. 6, p. CD008782.[http://dx.doi.org/10.1002/14651858.CD008782.pub4] [PMID: 24913 723] ]. We previously reported that among cases clinically diagnosed with AD, the number of Aβ-negative cases increases with age [15T. Mino, H. Saito, and J. Takeuchi, "Cerebral blood flow abnormality in clinically diagnosed Alzheimer’s disease patients with or without amyloid β accumulation on positron emission tomography", Neurol. Clin. Neurosci., vol. 5, pp. 55-59.[http://dx.doi.org/10.1111/ncn3.12107] ]. These Aβ-negative cases are not included in AD pathologically [16H. Braak, and E. Braak, "Neuropathological stageing of Alzheimer-related changes", Acta Neuropathol., vol. 82, no. 4, pp. 239-259.[http://dx.doi.org/10.1007/BF00308809] [PMID: 1759558] ] nor by the recent clinical definition of AD used by the National Institute on Aging and Alzheimer’s Association research framework using biomarkers [8G.M. McKhann, D.S. Knopman, H. Chertkow, B.T. Hyman, C.R. Jack Jr, C.H. Kawas, W.E. Klunk, W.J. Koroshetz, J.J. Manly, R. Mayeux, R.C. Mohs, J.C. Morris, M.N. Rossor, P. Scheltens, M.C. Carrillo, B. Thies, S. Weintraub, and C.H. Phelps, "The diagnosis of dementia due to Alzheimer’s disease: Recommendations from the National Institute on Aging-Alzheimer’s Association workgroups on diagnostic guidelines for Alzheimer’s disease", Alzheimers Dement., vol. 7, no. 3, pp. 263-269.[http://dx.doi.org/10.1016/j.jalz.2011.03.005] [PMID: 21514250] , 17C.R. Jack Jr, D.A. Bennett, K. Blennow, M.C. Carrillo, B. Dunn, S.B. Haeberlein, D.M. Holtzman, W. Jagust, F. Jessen, J. Karlawish, E. Liu, J.L. Molinuevo, T. Montine, C. Phelps, K.P. Rankin, C.C. Rowe, P. Scheltens, E. Siemers, H.M. Snyder, and R. Sperling, "NIA-AA Research Framework: Toward a biological definition of Alzheimer’s disease", Alzheimers Dement., vol. 14, no. 4, pp. 535-562.[http://dx.doi.org/10.1016/j.jalz.2018.02.018] [PMID: 29653606] , 18R.A. Sperling, P.S. Aisen, L.A. Beckett, D.A. Bennett, S. Craft, A.M. Fagan, T. Iwatsubo, C.R. Jack Jr, J. Kaye, T.J. Montine, D.C. Park, E.M. Reiman, C.C. Rowe, E. Siemers, Y. Stern, K. Yaffe, M.C. Carrillo, B. Thies, M. Morrison-Bogorad, M.V. Wagster, and C.H. Phelps, "Toward defining the preclinical stages of Alzheimer’s disease: Recommendations from the National Institute on Aging-Alzheimer’s Association workgroups on diagnostic guidelines for Alzheimer’s disease", Alzheimers Dement., vol. 7, no. 3, pp. 280-292.[http://dx.doi.org/10.1016/j.jalz.2011.03.003] [PMID: 21514248] ].

The classical amyloid hypothesis of AD suggests that oligomer or accumulated Aβ is the first and common pathway to induce neurodegeneration [19D.J. Selkoe, "The molecular pathology of Alzheimer’s disease", Neuron, vol. 6, no. 4, pp. 487-498.[http://dx.doi.org/10.1016/0896-6273(91)90052-2] [PMID: 1673054] -21D.J. Selkoe, and J. Hardy, "The amyloid hypothesis of Alzheimer’s disease at 25 years", EMBO Mol. Med., vol. 8, no. 6, pp. 595-608.[http://dx.doi.org/10.15252/emmm.201606210] [PMID: 27025652] ]. Tau accumulation and neuronal dysfunction may follow such Aβ accumulation [22C.A. Lemere, F. Lopera, K.S. Kosik, C.L. Lendon, J. Ossa, T.C. Saido, H. Yamaguchi, A. Ruiz, A. Martinez, L. Madrigal, L. Hincapie, J.C. Arango, D.C. Anthony, E.H. Koo, A.M. Goate, D.J. Selkoe, and J.C. Arango, "The E280A presenilin 1 Alzheimer mutation produces increased A β 42 deposition and severe cerebellar pathology", Nat. Med., vol. 2, no. 10, pp. 1146-1150.[http://dx.doi.org/10.1038/nm1096-1146] [PMID: 8837617] , 23C.A. Lemere, J.K. Blusztajn, H. Yamaguchi, T. Wisniewski, T.C. Saido, and D.J. Selkoe, "Sequence of deposition of heterogeneous amyloid β-peptides and APO E in Down syndrome: Implications for initial events in amyloid plaque formation", Neurobiol. Dis., vol. 3, no. 1, pp. 16-32.[http://dx.doi.org/10.1006/nbdi.1996.0003] [PMID: 9173910] ]. However, this sequence was mainly confirmed in hereditary AD [24D.C. Ryman, N. Acosta-Baena, P.S. Aisen, T. Bird, A. Danek, N.C. Fox, A. Goate, P. Frommelt, B. Ghetti, J.B. Langbaum, F. Lopera, R. Martins, C.L. Masters, R.P. Mayeux, E. McDade, S. Moreno, E.M. Reiman, J.M. Ringman, S. Salloway, P.R. Schofield, R. Sperling, P.N. Tariot, C. Xiong, J.C. Morris, and R.J. Bateman, "Symptom onset in autosomal dominant Alzheimer disease: A systematic review and meta-analysis", Neurology, vol. 83, no. 3, pp. 253-260.[http://dx.doi.org/10.1212/WNL.0000000000000596] [PMID: 24928 124] , 25R.J. Bateman, C. Xiong, T.L.S. Benzinger, A.M. Fagan, A. Goate, N.C. Fox, D.S. Marcus, N.J. Cairns, X. Xie, T.M. Blazey, D.M. Holtzman, A. Santacruz, V. Buckles, A. Oliver, K. Moulder, P.S. Aisen, B. Ghetti, W.E. Klunk, E. McDade, R.N. Martins, C.L. Masters, R. Mayeux, J.M. Ringman, M.N. Rossor, P.R. Schofield, R.A. Sperling, S. Salloway, and J.C. Morris, "Clinical and biomarker changes in dominantly inherited Alzheimer’s disease", N. Engl. J. Med., vol. 367, no. 9, pp. 795-804.[http://dx.doi.org/10.1056/NEJMoa1202753] [PMID: 22784036] ] and may not be applied to sporadic AD. Indeed, we previously reported that age-related accumulation of tau may precede robust Aβ accumulation, leading to AD [26T. Kikukawa, H. Saito, and I. Hasegawa, "Localized Accumulation of Tau without Amyloid-beta in Aged Brains Measured with [C]11PBB3 and [11C]PiB Positron Emission Tomography", J. Alzheimers Dis. Parkinsonism, vol. 7, p. 6.[http://dx.doi.org/10.4172/2161-0460.1000401] ]. Furthermore, the failure of many clinical trials targeting Aβ indicates that Aβ may not be the primary cause [27S. Salloway, R. Sperling, N.C. Fox, K. Blennow, W. Klunk, M. Raskind, M. Sabbagh, L.S. Honig, A.P. Porsteinsson, S. Ferris, M. Reichert, N. Ketter, B. Nejadnik, V. Guenzler, M. Miloslavsky, D. Wang, Y. Lu, J. Lull, I.C. Tudor, E. Liu, M. Grundman, E. Yuen, R. Black, and H.R. Brashear, "Two phase 3 trials of bapineuzumab in mild-to-moderate Alzheimer’s disease", N. Engl. J. Med., vol. 370, no. 4, pp. 322-333.[http://dx.doi.org/10.1056/NEJMoa1304839] [PMID: 24450891] -30M.F. Egan, J. Kost, P.N. Tariot, P.S. Aisen, J.L. Cummings, B. Vellas, C. Sur, Y. Mukai, T. Voss, C. Furtek, E. Mahoney, L. Harper Mozley, R. Vandenberghe, Y. Mo, and D. Michelson, "Randomized trial of verubecestat for mild-to-moderate alzheimer’s disease", N. Engl. J. Med., vol. 378, no. 18, pp. 1691-1703.[http://dx.doi.org/10.1056/NEJMoa1706441] [PMID: 29719179] ].

Neuropathologically, cerebrovascular diseases, primary Age-Related Tauopathy (PART), and α-synucleinopathy are the leading causes of non-amyloid dementia [6Y. Matsui, Y. Tanizaki, H. Arima, K. Yonemoto, Y. Doi, T. Ninomiya, K. Sasaki, M. Iida, T. Iwaki, S. Kanba, and Y. Kiyohara, "Incidence and survival of dementia in a general population of Japanese elderly: The Hisayama study", J. Neurol. Neurosurg. Psychiatry, vol. 80, no. 4, pp. 366-370.[http://dx.doi.org/10.1136/jnnp.2008.155481] [PMID: 18977 814] , 31M. Dani, D.J. Brooks, and P. Edison, "Suspected non-Alzheimer’s pathology - Is it non-Alzheimer’s or non-amyloid?", Ageing Res. Rev., vol. 36, pp. 20-31.[http://dx.doi.org/10.1016/j.arr.2017.02.003] [PMID: 28235659] -33S.C. Burnham, P. Bourgeat, V. Doré, G. Savage, B. Brown, S. Laws, P. Maruff, O. Salvado, D. Ames, R.N. Martins, C.L. Masters, C.C. Rowe, and V.L. Villemagne, "Clinical and cognitive trajectories in cognitively healthy elderly individuals with suspected non-Alzheimer’s disease pathophysiology (SNAP) or Alzheimer’s disease pathology: A longitudinal study", Lancet Neurol., vol. 15, no. 10, pp. 1044-1053.[http://dx.doi.org/10.1016/S1474-4422(16)30125-9] [PMID: 27450 471] ]. Among these, age-related tau accumulation without Aβ in the medial temporal lobe, basal forebrain, and brainstem is postulated to represent PART [34J.F. Crary, J.Q. Trojanowski, J.A. Schneider, J.F. Abisambra, E.L. Abner, I. Alafuzoff, S.E. Arnold, J. Attems, T.G. Beach, E.H. Bigio, N.J. Cairns, D.W. Dickson, M. Gearing, L.T. Grinberg, P.R. Hof, B.T. Hyman, K. Jellinger, G.A. Jicha, G.G. Kovacs, D.S. Knopman, J. Kofler, W.A. Kukull, I.R. Mackenzie, E. Masliah, A. McKee, T.J. Montine, M.E. Murray, J.H. Neltner, I. Santa-Maria, W.W. Seeley, A. Serrano-Pozo, M.L. Shelanski, T. Stein, M. Takao, D.R. Thal, J.B. Toledo, J.C. Troncoso, J.P. Vonsattel, C.L. White III, T. Wisniewski, R.L. Woltjer, M. Yamada, and P.T. Nelson, "Primary age-related tauopathy (PART): A common pathology associated with human aging", Acta Neuropathol., vol. 128, no. 6, pp. 755-766.[http://dx.doi.org/10.1007/s00401-014-1349-0] [PMID: 25348064] -37K.A. Josephs, M.E. Murray, N. Tosakulwong, J.L. Whitwell, D.S. Knopman, M.M. Machulda, S.D. Weigand, B.F. Boeve, K. Kantarci, L. Petrucelli, V.J. Lowe, C.R. Jack Jr, R.C. Petersen, J.E. Parisi, and D.W. Dickson, "Tau aggregation influences cognition and hippocampal atrophy in the absence of beta-amyloid: A clinico-imaging-pathological study of primary age-related tauopathy (PART)", Acta Neuropathol., vol. 133, no. 5, pp. 705-715.[http://dx.doi.org/10.1007/s00401-017-1681-2] [PMID: 28160067] ]. The concept of PART covers cases with normal cognitive function to those with profound cognitive impairment. The latter cases are reported to include Argyrophilic Grain Disease (AGD) [38K.A. Jellinger, "Dementia with grains (argyrophilic grain disease)", Brain Pathol., vol. 8, no. 2, pp. 377-386.[http://dx.doi.org/10.1111/j.1750-3639.1998.tb00161.x] [PMID: 9546 294] -41R.D. Rodriguez, C.K. Suemoto, M. Molina, C.F. Nascimento, R.E. Leite, R.E. de Lucena Ferretti-Rebustini, J.M. Farfel, H. Heinsen, R. Nitrini, K. Ueda, C.A. Pasqualucci, W. Jacob-Filho, K. Yaffe, and L.T. Grinberg, "Argyrophilic grain disease: Demographics, clinical, and neuropathological features from a large autopsy study", J. Neuropathol. Exp. Neurol., vol. 75, no. 7, pp. 628-635.[http://dx.doi.org/10.1093/jnen/nlw034] [PMID: 27283329] ] and Neurofibrillary Tangle-Predominant Dementia (NFTPD) [42K.A. Jellinger, and C. Bancher, "Senile dementia with tangles (tangle predominant form of senile dementia)", Brain Pathol., vol. 8, no. 2, pp. 367-376.[http://dx.doi.org/10.1111/j.1750-3639.1998.tb00160.x] [PMID: 9546 293] -45I. Santa-Maria, A. Haggiagi, X. Liu, J. Wasserscheid, P.T. Nelson, K. Dewar, L.N. Clark, and J.F. Crary, "The MAPT H1 haplotype is associated with tangle-predominant dementia", Acta Neuropathol., vol. 124, no. 5, pp. 693-704.[http://dx.doi.org/10.1007/s00401-012-1017-1] [PMID: 22802095] ].

To explore the contribution of tau to Amyloid-Negative Dementia in the Elderly (ANDE), we studied tau accumulation with a radiopharmaceutically significant tracer, 2-[(1E, 3E)-4-[6-[11C] methylamino] pyridin-3-yl]buta-1,3-dien-1-yl]-1,3-benzothiazol-6-ol ([11C]PBB3), for Positron Emission Tomography (PET) [46M. Maruyama, H. Shimada, T. Suhara, H. Shinotoh, B. Ji, J. Maeda, M.R. Zhang, J.Q. Trojanowski, V.M. Lee, M. Ono, K. Masamoto, H. Takano, N. Sahara, N. Iwata, N. Okamura, S. Furumoto, Y. Kudo, Q. Chang, T.C. Saido, A. Takashima, J. Lewis, M.K. Jang, I. Aoki, H. Ito, and M. Higuchi, "Imaging of tau pathology in a tauopathy mouse model and in Alzheimer patients compared to normal controls", Neuron, vol. 79, no. 6, pp. 1094-1108.[http://dx.doi.org/10.1016/j.neuron.2013.07.037] [PMID: 24050400] -49H. Shimada, S. Kitamura, H. Shinotoh, H. Endo, F. Niwa, S. Hirano, Y. Kimura, M.R. Zhang, S. Kuwabara, T. Suhara, and M. Higuchi, "Association between Aβ and tau accumulations and their influence on clinical features in aging and Alzheimer’s disease spectrum brains: A [11C]PBB3-PET study", Alzheimers Dement. (Amst.), vol. 6, pp. 11-20.[http://dx.doi.org/10.1016/j.dadm.2016.12.009] [PMID: 28138509] ].

2. MATERIALS AND METHOD

2.1. Ethics

Written informed consent was obtained from all participants or from close family when the participants were cognitively impaired. The present study was approved by the Institutional Research Ethics Committee of Osaka City University Graduate School of Medicine (IRB# 3009).

2.2. Healthy Controls

Subjectively Healthy Controls (HC) without a history of brain disorders were openly recruited as candidates. Detailed medical histories were obtained through interviews conducted by a board-certified neurologist. Thorough neurological examinations, including general cognitive function tests, were performed by the same neurologist. The Mini-Mental State Examination (MMSE), revised Hasegawa Dementia Scale (HDS-R) [50T. Hosokawa, Y. Yamada, A. Isagoda, and R. Nakamura, "Psychometric equivalence of the Hasegawa Dementia Scale-Revised with the Mini-Mental State Examination in stroke patients", Percept. Mot. Skills, vol. 79, no. 1 Pt 2, pp. 664-666.[http://dx.doi.org/10.2466/pms.1994.79.1.664] [PMID: 7808907] ], and Rivermead Behavioral Memory Test (RBMT) [51N.M. Steibel, M.R. Olchik, M.S. Yassuda, G. Finger, and I. Gomes, "Influence of age and education on the Rivermead Behavioral Memory Test (RBMT) among healthy elderly", Dement. Neuropsychol., vol. 10, no. 1, pp. 26-30.[http://dx.doi.org/10.1590/s1980-57642016dn10100005] [PMID: 29213 427] ] were conducted by qualified clinical psychologists (MA, NK). Blood samples were collected to evaluate general physical conditions. Magnetic Resonance Images (MRIs) were also evaluated.

Exclusion criteria were as follows: 1) history of any brain diseases, history of brain surgery, or head trauma requiring hospitalization; 2) high risks for cerebrovascular diseases, including poorly controlled diabetes, dyslipidemia, and high blood pressure; 3) any neurological findings suggesting brain disorders; 4) cognitive test (MMSE, HDS-R, and RBMT) indicating border-zone or worse level; and 5) MRI lesions including asymptomatic lacunas, severe white matter lesion, many cerebral microbleeds and atrophy beyond average for their age. 6) Amyloid PET imaging was employed for the exclusion of enrollment. No other biomarkers were examined in the HC group.

2.3. ANDE

Seven cases with slowly progressive dementia who were older than 80 years and were negative for Aβ were evaluated (age 83.5±2.1 years, 5 male, 2 female; (Table 1). The MMSE score was 19.9±4.5 and the disease duration was 5.4±3.3 years.

In one case (case 1), an autopsy was obtained 2 years after the PET examination. The section of the brain was examined with Gallyas Braak silver 4 and immunostained using the following antibodies; phosphorylated tau (p-tau; AT-8, 1:100, monoclonal; Innogenetics, Ghent, Belgium), Aβ (Aβ11-28, monoclonal; IBL, Maebashi, Gunma, Japan), phosphorylated α-synuclein (p Syn#64, polyclonal, 1:20,000; Wako, Osaka, Japan), and phosphorylated TDP-43 (p-TDP-43) (pSer409/410, monoclonal, 1:10,000; Cosmo Bio, Tokyo, Japan).

Fig. (1)
Region of Interest (ROI). Each ROI was manually delineated on standard MR images to which individual PET data was standardized after acquisition of individual MR images. LTC: Lateral Temporal Cortex, FRC: Frontal Cortex, PCG: Posterior Cingulate Gyrus, PC: Precuneus, PAR: Parietal Cortex, PHG: Parahippocampal Gyrus.


Among cases without an autopsy, three cases showed strong laterality in hippocampal atrophy on MRI, and AGD was clinically suspected. The left side showed greater atrophy in all cases. The other 3 cases had no significant laterality in hippocampal atrophy (probable NFTPD).

2.4. PET Data Acquisition

[11C]PBB3 and [11C]Pittsburgh compound-B (2-[4-([11C] methylamino) phenyl]-1,3-benzothiazol-6-ol, [11C]PiB) were produced based on the previously reported method [46M. Maruyama, H. Shimada, T. Suhara, H. Shinotoh, B. Ji, J. Maeda, M.R. Zhang, J.Q. Trojanowski, V.M. Lee, M. Ono, K. Masamoto, H. Takano, N. Sahara, N. Iwata, N. Okamura, S. Furumoto, Y. Kudo, Q. Chang, T.C. Saido, A. Takashima, J. Lewis, M.K. Jang, I. Aoki, H. Ito, and M. Higuchi, "Imaging of tau pathology in a tauopathy mouse model and in Alzheimer patients compared to normal controls", Neuron, vol. 79, no. 6, pp. 1094-1108.[http://dx.doi.org/10.1016/j.neuron.2013.07.037] [PMID: 24050400] , 52H. Hashimoto, K. Kawamura, N. Igarashi, M. Takei, T. Fujishiro, Y. Aihara, S. Shiomi, M. Muto, T. Ito, K. Furutsuka, T. Yamasaki, J. Yui, L. Xie, M. Ono, A. Hatori, K. Nemoto, T. Suhara, M. Higuchi, and M.R. Zhang, "Radiosynthesis, photoisomerization, biodistribution, and metabolite analysis of 11C-PBB3 as a clinically useful PET probe for imaging of tau pathology", J. Nucl. Med., vol. 55, no. 9, pp. 1532-1538.[http://dx.doi.org/10.2967/jnumed.114.139550] [PMID: 24963128] , 53Y. Kimura, M. Ichise, H. Ito, H. Shimada, Y. Ikoma, C. Seki, H. Takano, S. Kitamura, H. Shinotoh, K. Kawamura, M.R. Zhang, N. Sahara, T. Suhara, and M. Higuchi, "PET Quantification of Tau Pathology in Human Brain with 11C-PBB3", J. Nucl. Med., vol. 56, no. 9, pp. 1359-1365.[http://dx.doi.org/10.2967/jnumed.115.160127] [PMID: 26182966] ]. [11C]PBB3-and [11C]PiB-PET images were acquired with a Siemens Biograph16 scanner (Siemens/CTI, Knoxville, TN, USA) and with an Eminence-B PET scanner (Shimadzu Co., Kyoto, Japan), respectively. For tau imaging, [11C]PBB3 in the range of 370 MBq (Body Weight ≤50kg) to 555 MBq (Body Weight ≥70kg) was intravenously injected in a dimly lit room to avoid photoracemization. A 60-minute PET scan was performed in the list mode. The acquired data were sorted into dynamic data of 6×10 s, 3×20 s, 6×60 s, 4×180 s, 8×300 s frames. For Aβ imaging, each subject received 400 to 500 MBq of [11C]PiB intravenously over 1 minute. After the injection, static scan image acquisition was performed for 50 to 70 minutes. PET images for [11C]PBB3 and [11C]PiB were reconstructed by filtered back projection using a 4-mm Full Width at Half Maximum (FWHM) Hanning filter and a 5-mm FWHM Gaussian filter with attenuation and scatter correction, respectively.

2.5. MRI Acquisition

MRI data were obtained with a 1.5 or 3-Tesla magnetic resonance scanner (MAGNETOM Avanto, Siemens Healthcare, Erlangen, Germany or Ingenia, Philips Healthcare, Best, The Netherlands). Three-dimensional volumetric acquisition of a T1- weighted gradient echo sequence (repetition time range/echo time range, 6.5 ms/3.2 ms; field of view [frequency × phase], 240 mm×240 mm; matrix, 256×256; contiguous axial slices of 1.5 mm thickness) was performed.

2.6. Image Processing

All images were processed using PMOD software version 3.7 (PMOD Technologies Ltd., Zurich, Switzerland) [54W.H. Choi, Y.H. Um, W.S. Jung, and S.H. Kim, "Automated quantification of amyloid positron emission tomography: A comparison of PMOD and MIMneuro", Ann. Nucl. Med., vol. 30, no. 10, pp. 682-689.[http://dx.doi.org/10.1007/s12149-016-1115-6] [PMID: 27567617] -56Y. Wang, Z. Shi, and N. Zhang, "Spatial patterns of hypometabolism and amyloid deposition in variants of alzheimer’s disease corresponding to brain networks: A prospective cohort study", Mol. Imaging Biol., .[http://dx.doi.org/10.1007/s11307-018-1219-6] [PMID: 29869063] ] and Statistical Parametric Mapping software (SPM12, Wellcome Department of Cognitive Neurology, London, UK), operating on the MATLAB software environment (version R2016b; MathWorks, Natick, MA, USA) [57F. Gallivanone, P.A. Della Rosa, and I. Castiglioni, "Statistical voxel-based methods and [18F]FDG PET brain imaging: frontiers for the diagnosis of AD", Curr. Alzheimer Res., vol. 13, no. 6, pp. 682-694.[http://dx.doi.org/10.2174/1567205013666151116142039] [PMID: 26567733] ]. Acquired [11C]PBB3 and [11C]PiB images were transformed into the standard brain using PMOD, and then, SUVR images were generated with the cerebellar cortex as a reference region using the frame-summation of dynamic image for 30 to 50 minutes after [11C]PBB3 injection and for 50 to 70 minutes after [11C]PiB injection. SUVR level of each VOI was calculated in manually set ROI as shown in Fig. (1). To facilitate the visual presentation of SUVR images, [11C]PBB3 accumulation outside of the masked brain was eliminated. Mask images of the brain, set on MRI images of each case, were transformed to match the standard brain.

Each T1-weight MRI was segmented and anatomically normalized to MNI152 standard space (Montreal Neurological Institute, Montreal, QC, Canada) using SPM12 and Diffeomorphic Anatomical Registration Through Exponentiated Lie Algebra (DARTEL) [58J. Ashburner, "A fast diffeomorphic image registration algorithm", Neuroimage, vol. 38, no. 1, pp. 95-113.[http://dx.doi.org/10.1016/j.neuroimage.2007.07.007] [PMID: 17761 438] ]. The [11C]PBB3-SUVR images were co-registered to individual T1-weighted MRI using PMOD and then normalized to MNI space using the same parameters as those for MRI (flow fields method) with smoothing at 8-mm full-width-at-half-maximum.

Fig. (2)
Group comparison between the group with ANDE (n=7) and HC (n=12). A. Significantly high accumulation of tau is observed in large area of bilateral parietal cortices and limited area of the right frontal lobe. B. Cortical projection of SPM analysis reveals significant accumulation of tau diffusely (red: p<0.01).


2.7. Criteria for Aβ Accumulation

Aβ accumulation was visually evaluated based on the Japanese Alzheimer’s Disease Neuroimaging Initiative (J-ADNI) Visual Criteria for [11C]PiB-PET (J- ADNI _ PETQC _ Ver1.1) modified from ADNI PET core criteria [59W.J. Jagust, D. Bandy, and K. Chen, "The ADNI PET Core", Alzheimers Dement., vol. 6, pp. 221-229.[http://dx.doi.org/10.1016/j.jalz.2010.03.003] [PMID: 20451870] ]. Four regions selected for the assessment were the precuneus-posterior cingulate gyrus, frontal lobe, lateral temporal lobe, and lateral parietal lobe. When the accumulation in one of the above 4 cerebral cortices was higher than that in the white matter just below the cortex, the case was determined as positive. When none of the 4 cortices had higher accumulation than the white matter, the case was confirmed as negative.

2.8. Voxel-Wise Analysis of [11C]PBB3

Voxel-wise comparison of [11C]PBB3 accumulation data was performed between the ANDE and HC group by 2-sample t-test using SPM12 [60A. Maass, S. Landau, S.L. Baker, A. Horng, S.N. Lockhart, R. La Joie, G.D. Rabinovici, and W.J. Jagust, "Comparison of multiple tau-PET measures as biomarkers in aging and Alzheimer’s disease", Neuroimage, vol. 157, pp. 448-463.[http://dx.doi.org/10.1016/j.neuroimage.2017.05.058] [PMID: 28587 897] ]. In addition, [11C]PBB3 data from individual ANDE case was compared with the HC group by Jack-knife analysis using SPM12 [61M.S. Mega, I.D. Dinov, J.C. Mazziotta, M. Manese, P.M. Thompson, C. Lindshield, J. Moussai, N. Tran, K. Olsen, C.I. Zoumalan, R.P. Woods, and A.W. Toga, "Automated brain tissue assessment in the elderly and demented population: Construction and validation of a sub-volume probabilistic brain atlas", Neuroimage, vol. 26, no. 4, pp. 1009-1018.[http://dx.doi.org/10.1016/j.neuroimage.2005.03.031] [PMID: 15908 234] ]. In both analyses, the threshold for significance was set at P<0.05 Family-Wise Error (FWE)-corrected at a cluster-level following P<0.01 uncorrected at the voxel level.

2.9. Statistical Analysis of Regional SUVR

In each regional SUVR, age correction was performed using by the linear regression set for the data of HC. Details are described elsewhere [26T. Kikukawa, H. Saito, and I. Hasegawa, "Localized Accumulation of Tau without Amyloid-beta in Aged Brains Measured with [C]11PBB3 and [11C]PiB Positron Emission Tomography", J. Alzheimers Dis. Parkinsonism, vol. 7, p. 6.[http://dx.doi.org/10.4172/2161-0460.1000401] ]. In short, the age-dependent linear increase in regional SUVR was found in all ROI’s in the HC group and the linear regression curve was calculated to the data in each ROI. Age correction for SUVR in each case was made based on the linear curve. Group comparison was made between HC and AGD or between HC and NFTPD. To evaluate the effect of atrophy on apparent [11C]PBB3 accumulation in AGD, each side was separately analyzed. Accumulation of [11C]PBB3 on the side of less atrophy was compared with that of more atrophy by paired t-test.

3. RESULTS

We found that there was a very high burden of tau in the lateral temporal cortex in ANDE. Scattered neurofibrillary tangles were confirmed in this region in an autopsied case. In addition, diffuse PBB3 accumulation was found in the bilateral parietal lobes, precuneus, and parahippocampal gyrus. No corresponding tau pathology was confirmed in the autopsied case in these regions, suggesting possible undetermined binding pathology in ANDE.

3.1. Demographical Data and MRI Findings

Table 1 shows the demographical data of ANDE and HC. Cases of ANDE were older than HC. The method for age correction in the image analysis was stated above. Four cases out of 7 in ANDE had an MMSE score less than or equal to 20 points. Four cases of clinical AGD had longer disease duration, and higher MMSE score than NFTPD cases, reflecting the general characteristic of these diseases. Due to the small sampling size, a statistical comparison was not made.

3.2. Tau Accumulation in ANDE

There is a very high burden of tau in the diffuse area of the bilateral parietal lobes in ANDE by voxel-wise comparison with HC (Fig. 2). Mild accumulation was found in the frontal lobes and lateral temporal lobes on both sides. Accumulation in the cortices neighboring the sagittal sinus and the transverse sinus may reflect spillover of nonspecific accumulation in the sinuses. Cortical accumulation was observed to be centered on the gyrus, not on the sulcus, excluding the possibility of vascular spillover on the cortex.

Fig. (3)
Regional [11C]PBB3 SUVR values in ANDE and HC. Significantly high accumulation was found in the parietal cortex, precuneus and the lateral temporal cortex of NFTPD (p<0.05). To evaluate effect of atrophy on apparent [11C]PBB3 accumulation, each side was separately analyzed in cases with AGD. Less/ More indicate side of less or more atrophy on MRI. No correlation was found. Open square indicates significantly high accumulation compared to NC.


Fig. (4)
Tau PET of Case1 (autopsy case). (A) High accumulation of tau was found on the right side of the parietal, frontal and lateral temporal lobes (B). Cortical atrophy was predominant on the left side (C).


Fig. (5)
Very limited number of senile plaques positive for Aβ11-28 were found in the temporal lobe (A) and parietal lobe (B). Neurofibrillary tangle was moderately found in the parahippocampal gyrus (Gallyas staining) (C) and was positive for AT8 staining for phosphorylated tau (D).


3.3. Regional SUVR of [11C]PBB3 in ANDE and HC

The SUVR of AGD and NFTPD was compared with that in HC. Significantly high accumulation was found in the parietal cortex, precuneus and the lateral temporal cortex of NFTPD (P<0.05) (Fig. 3).

To evaluate the effect of atrophy on apparent [11C]PBB3 accumulation, each side was analyzed separately in cases with AGD. In most cases, a great difference in [11C]PBB3 accumulation was seen between the sides, but no correlation was found between the side of atrophy and level of tau accumulation (Fig. 3).

In addition, the level of individual SUVR was compared with the distribution of tau accumulation in HC. The open square in Fig. (3) indicates significantly high accumulation in the parietal lobe, frontal lobe, and parahippocampal gyrus.

No correlation was found between MMSE and SUVR in AGD as well as in NFTPD.

3.4. Autopsy Case

PET study revealed tau accumulation at the right lateral temporal lobe, frontal lobe and, parietal lobe (Fig. 4A,B). Cortical atrophy was predominant on the left side (Fig. 4C), where an apparent accumulation of tau was less severe.

Pathologically, a very limited number of senile plaques immunopositive for Aβ11-28 were found in the temporal lobe (Fig. 5A), occipital lobe and parietal lobe (Fig. 5B; Braak amyloid stage A). Neurofibrillary tangles were scattered in the parahippocampal gyrus (Gallyas-Braak silver staining, Fig. 5C; Braak neurofibrillary stage II) and were immunopositive for AT8 antibody (Fig. 5D) [16H. Braak, and E. Braak, "Neuropathological stageing of Alzheimer-related changes", Acta Neuropathol., vol. 82, no. 4, pp. 239-259.[http://dx.doi.org/10.1007/BF00308809] [PMID: 1759558] , 62H. Braak, I. Alafuzoff, T. Arzberger, H. Kretzschmar, and K. Del Tredici, "Staging of Alzheimer disease-associated neurofibrillary pathology using paraffin sections and immunocytochemistry", Acta Neuropathol., vol. 112, no. 4, pp. 389-404.[http://dx.doi.org/10.1007/s00401-006-0127-z] [PMID: 16906426] , 63F. Gallyas, "Silver staining of Alzheimer’s neurofibrillary changes by means of physical development", Acta Morphol. Acad. Sci. Hung., vol. 19, no. 1, pp. 1-8.[PMID: 4107507] ]. Neither argyrophilic grain, Lewy body, nor TDP-43 positive structure was found. In conclusion, pathological diagnosis was mild ageing change.

3.5. Subtypes of ANDE

Four cases were diagnosed as having AGD based on clinical course and neuroimaging findings. These cases showed significantly high tau accumulation on either side of the temporal lobe (Fig. 6). The side of higher tau accumulation was on the atrophied side in 3 of 4 cases, suggesting the dominantly affected side.

In contrast, 3 cases of NFTPD revealed tau accumulation on the bilateral temporal lobes and parietal lobes (Fig. 7). MRI showed mild atrophy on the bilateral parahippocampal gyrus.

4. DISCUSSION

4.1. General Comments

To explore the mechanism of dementia often found in the ANDE, we studied the possible involvement of tau with PET. Compared to the age-corrected HC, we found that tau accumulation is significantly high in the parietal lobe of cases with dementia. Together with the lesion at the precuneus and temporal lobe in some cases, we speculate that the tau accumulation detected with [11C]PBB3-PET induces dementia. We previously reported that these ANDEs result in milder dementia and progress more slowly than AD [64J. Takeuchi, H. Shimada, S. Ataka, J. Kawabe, H. Mori, K. Mizuno, Y. Wada, S. Shiomi, Y. Watanabe, and T. Miki, "Clinical features of Pittsburgh compound-B-negative dementia", Dement. Geriatr. Cogn. Disord., vol. 34, no. 2, pp. 112-120.[http://dx.doi.org/10.1159/000341577] [PMID: 22947919] ]. Furthermore, amyloid targeting therapy must be ineffective in amyloid negative dementia. Therefore, distinguishing between these 2 pathophysiologies is critical.

The concept of SNAP (Suspected Non-Alzheimer Pathology) covers young as well as old cases [31M. Dani, D.J. Brooks, and P. Edison, "Suspected non-Alzheimer’s pathology - Is it non-Alzheimer’s or non-amyloid?", Ageing Res. Rev., vol. 36, pp. 20-31.[http://dx.doi.org/10.1016/j.arr.2017.02.003] [PMID: 28235659] , 33S.C. Burnham, P. Bourgeat, V. Doré, G. Savage, B. Brown, S. Laws, P. Maruff, O. Salvado, D. Ames, R.N. Martins, C.L. Masters, C.C. Rowe, and V.L. Villemagne, "Clinical and cognitive trajectories in cognitively healthy elderly individuals with suspected non-Alzheimer’s disease pathophysiology (SNAP) or Alzheimer’s disease pathology: A longitudinal study", Lancet Neurol., vol. 15, no. 10, pp. 1044-1053.[http://dx.doi.org/10.1016/S1474-4422(16)30125-9] [PMID: 27450 471] , 65M. Schöll, S.N. Lockhart, D.R. Schonhaut, J.P. O’Neil, M. Janabi, R. Ossenkoppele, S.L. Baker, J.W. Vogel, J. Faria, H.D. Schwimmer, G.D. Rabinovici, and W.J. Jagust, "PET imaging of tau deposition in the aging human brain", Neuron, vol. 89, no. 5, pp. 971-982.[http://dx.doi.org/10.1016/j.neuron.2016.01.028] [PMID: 26938442] ]. It also includes cases with normal cognitive function as well as those with mild to severe dementia. By definition, ANDE in the present study is included in SNAP.

Fig. (6)
A case with AGD. (A) Tau accumulation was found on the right temporal lobe (arrows) and parietal lobe. (B) Cortical projection reveals significant accumulation of tau diffusely on the right parietal lobe. (C) MRI reveals hippocampal atrophy on the right side.


Fig. (7)
A case with NFTPD. (A) Tau accumulation was found on the bilateral temporal lobes. (B) Cortical projection reveals significant accumulation of tau diffusely on the bilateral parietal lobes. (C) MRI reveals bilateral hippocampal atrophy.


4.2. Pathological Mechanisms for Tau Accumulation

An autopsy was obtained in only 1 case, in which neurofibrillary tangles were observed at the parahippocampal gyrus. [11C]PBB3-PET also revealed tau accumulation in the same lesion. Three cases of clinical NFTPD showed significant [11C]PBB3 accumulation at lateral temporal lobe. These are the typical distributions of neurofibrillary tangle in NFTPD, suggesting the possibility that [11C]PBB3 detects tau in the neurofibrillary tangle in these cases.

Four cases of clinical AGD showed inconsistent results of [11C]PBB3 accumulation, some high and the others low. The side of atrophy does not coincide with that of high [11C]PBB3. High accumulation of AGD may induce cerebral atrophy, but further atrophy may reduce apparent tau accumulation, even below the level of the opposite side. Partial volume effect might enhance this apparent reduction on [11C]PBB3 images. Similar effects of cortical atrophy on apparently less tau accumulation may explain the opposing laterality in the autopsied case.

Parietal accumulation of PBB3 was significant in ANDE. Unexpectedly, no tau pathology was found in the parietal lobe of the autopsied case. In the present study, the average age of ANDE was higher than that of HC. Although the age-dependent increase in PBB3 binding was corrected with the linear regression curve, aging effect may be stronger than expected in this region. Another possibility is that undetermined pathology with PBB3 binding in ANDE might have developed in the parietal cortex. Further pathological study is warranted.

4.3. Tau Accumulation in Aging, Amyloid-Negative Dementia and AD

We previously reported that tau accumulates with age in the region related to AD [26T. Kikukawa, H. Saito, and I. Hasegawa, "Localized Accumulation of Tau without Amyloid-beta in Aged Brains Measured with [C]11PBB3 and [11C]PiB Positron Emission Tomography", J. Alzheimers Dis. Parkinsonism, vol. 7, p. 6.[http://dx.doi.org/10.4172/2161-0460.1000401] ]. This is in good accordance with the previous reports by Jagust WJ et al. regarding [18F]-AV-1451 [65M. Schöll, S.N. Lockhart, D.R. Schonhaut, J.P. O’Neil, M. Janabi, R. Ossenkoppele, S.L. Baker, J.W. Vogel, J. Faria, H.D. Schwimmer, G.D. Rabinovici, and W.J. Jagust, "PET imaging of tau deposition in the aging human brain", Neuron, vol. 89, no. 5, pp. 971-982.[http://dx.doi.org/10.1016/j.neuron.2016.01.028] [PMID: 26938442] -67B. Hall, E. Mak, S. Cervenka, F.I. Aigbirhio, J.B. Rowe, and J.T. O’Brien, "in vivo tau PET imaging in dementia: Pathophysiology, radiotracer quantification, and a systematic review of clinical findings", Ageing Res. Rev., vol. 36, pp. 50-63.[http://dx.doi.org/10.1016/j.arr.2017.03.002] [PMID: 28315409] ]. In the present study, we additionally found a further accumulation of tau in these regions, especially in the parietal lobe, in ANDE patients for the first time. Recently, age-related tau accumulation without Aβ in the medial temporal lobe, basal forebrain and, the brainstem is postulated to represent Primary Age-Related Tauopathy (PART) [34J.F. Crary, J.Q. Trojanowski, J.A. Schneider, J.F. Abisambra, E.L. Abner, I. Alafuzoff, S.E. Arnold, J. Attems, T.G. Beach, E.H. Bigio, N.J. Cairns, D.W. Dickson, M. Gearing, L.T. Grinberg, P.R. Hof, B.T. Hyman, K. Jellinger, G.A. Jicha, G.G. Kovacs, D.S. Knopman, J. Kofler, W.A. Kukull, I.R. Mackenzie, E. Masliah, A. McKee, T.J. Montine, M.E. Murray, J.H. Neltner, I. Santa-Maria, W.W. Seeley, A. Serrano-Pozo, M.L. Shelanski, T. Stein, M. Takao, D.R. Thal, J.B. Toledo, J.C. Troncoso, J.P. Vonsattel, C.L. White III, T. Wisniewski, R.L. Woltjer, M. Yamada, and P.T. Nelson, "Primary age-related tauopathy (PART): A common pathology associated with human aging", Acta Neuropathol., vol. 128, no. 6, pp. 755-766.[http://dx.doi.org/10.1007/s00401-014-1349-0] [PMID: 25348064] , 35J.F. Crary, "Primary age-related tauopathy and the amyloid cascade hypothesis: The exception that proves the rule?", J Neurol Neuromedicine, vol. 1, no. 6, pp. 53-57.[http://dx.doi.org/10.29245/2572.942X/2016/6.1059] [PMID: 27819 070] , 68R.F. Buckley, B. Hanseeuw, A.P. Schultz, P. Vannini, S.L. Aghjayan, M.J. Properzi, J.D. Jackson, E.C. Mormino, D.M. Rentz, R.A. Sperling, K.A. Johnson, and R.E. Amariglio, "Region-specific association of subjective cognitive decline with tauopathy independent of global β-amyloid burden", JAMA Neurol., vol. 74, no. 12, pp. 1455-1463.[http://dx.doi.org/10.1001/jamaneurol.2017.2216] [PMID: 28973551] ]. The concept of PART covers the case with normal cognitive function to that with profound cognitive impairment. [11C]PBB3 may detect this whole spectrum of PART.

In contrast, we previously reported that amyloid and tau accumulation begins in Mild Cognitive Impairment (MCI due to AD) and reaches the high level in AD [26T. Kikukawa, H. Saito, and I. Hasegawa, "Localized Accumulation of Tau without Amyloid-beta in Aged Brains Measured with [C]11PBB3 and [11C]PiB Positron Emission Tomography", J. Alzheimers Dis. Parkinsonism, vol. 7, p. 6.[http://dx.doi.org/10.4172/2161-0460.1000401] ]. Amyloid and tau may interact with each other to develop further lesions in AD [69O.G. Tatarnikova, M.A. Orlov, and N.V. Bobkova, "Beta-amyloid and tau-protein: Structure, interaction, and prion-like properties", Biochemistry (Mosc.), vol. 80, no. 13, pp. 1800-1819.[http://dx.doi.org/10.1134/S000629791513012X] [PMID: 26878581] -71B.J. Hanseeuw, R.A. Betensky, A.P. Schultz, K.V. Papp, E.C. Mormino, J. Sepulcre, J.S. Bark, D.M. Cosio, M. LaPoint, J.P. Chhatwal, D.M. Rentz, R.A. Sperling, and K.A. Johnson, "Fluorodeoxyglucose metabolism associated with tau-amyloid interaction predicts memory decline", Ann. Neurol., vol. 81, no. 4, pp. 583-596.[http://dx.doi.org/10.1002/ana.24910] [PMID: 28253546] ].

4.4. Characteristics of [11C]PBB3

One of the drawbacks of [11C]PBB3 is that it accumulates at cerebral sinuses including the superior sagittal sinus and transverse sinus [72N. Okamura, R. Harada, K. Furukawa, S. Furumoto, T. Tago, K. Yanai, H. Arai, and Y. Kudo, "Advances in the development of tau PET radiotracers and their clinical applications", Ageing Res. Rev., vol. 30, pp. 107-113.[http://dx.doi.org/10.1016/j.arr.2015.12.010] [PMID: 26802556] -74E.R. Zimmer, A. Leuzy, S. Gauthier, and P. Rosa-Neto, "Developments in Tau PET Imaging", Can. J. Neurol. Sci., vol. 41, no. 5, pp. 547-553.[http://dx.doi.org/10.1017/cjn.2014.15] [PMID: 25424 608] ]. The extent of accumulation varies between cases. Low accumulation can be eliminated by masking the accumulation at the sinuses, although high accumulation can affect the apparent measurement of the cerebral cortex. In the present study, high accumulation neighboring superior sagittal sinus and transverse sinus in the occipital lobe was considered an artifact.

The limited dynamic range of [11C]PBB3 to detect tau accumulation also may overlook smaller lesion or milder accumulation [48M. Ono, N. Sahara, K. Kumata, B. Ji, R. Ni, S. Koga, D.W. Dickson, J.Q. Trojanowski, V.M. Lee, M. Yoshida, I. Hozumi, Y. Yoshiyama, J.C. van Swieten, A. Nordberg, T. Suhara, M.R. Zhang, and M. Higuchi, "Distinct binding of PET ligands PBB3 and AV-1451 to tau fibril strains in neurodegenerative tauopathies", Brain, vol. 140, no. 3, pp. 764-780.[PMID: 28087578] ]. In the present study, tau accumulation was smaller and a milder lesion at parahippocampal gyrus and lateral temporal cortex may be underestimated in the study of [11C]PBB3. Possible overestimation of aging effect on tau accumulation at these lesions may additionally reduce the significance [26T. Kikukawa, H. Saito, and I. Hasegawa, "Localized Accumulation of Tau without Amyloid-beta in Aged Brains Measured with [C]11PBB3 and [11C]PiB Positron Emission Tomography", J. Alzheimers Dis. Parkinsonism, vol. 7, p. 6.[http://dx.doi.org/10.4172/2161-0460.1000401] ]. Further development of more sensitive tracer is warranted [75L. Saint-Aubert, L. Lemoine, K. Chiotis, A. Leuzy, E. Rodriguez-Vieitez, and A. Nordberg, "Tau PET imaging: Present and future directions", Mol. Neurodegener., vol. 12, no. 1, p. 19.[http://dx.doi.org/10.1186/s13024-017-0162-3] [PMID: 28219440] ].

4.5. Study Limitation

Pathology was confirmed only in 1 case, in which neurofibrillary tangles were identified abundantly in the parahippocampal gyrus but not so many in the parietal lobe. There might be some gap between [11C]PBB3 accumulation and pathological changes. Although the distribution of tau by [11C]PBB3 in cases with NFTPD in the present study is consistent with the distribution of lesion in the previous pathological reports, further pathological confirmation is warranted. Subjects were chosen from patients with clinical NFTPD and AGD at an outpatient clinic. A greater number of subjects with ANDE in general should be studied to draw definite conclusions.

CONCLUSION

A relatively high burden of tau deposition was commonly observed in the lateral temporal cortex of ANDE, which may explain dementia in these subjects. [11C]PBB3 may be useful in detecting tauopathy in these cases.

ETHICS APPROVAL AND CONSENT TO PARTICIPATE

The present study was approved by the Institutional Research Ethics Committee of Osaka City University Graduate School of Medicine (IRB# 3009).

HUMAN AND ANIMAL RIGHTS

No animals/humans were used for studies that are the basis of this research.

CONSENT FOR PUBLICATION

Written informed consent was obtained from all participants or from close family when the participants were cognitively impaired.

CONFLICT OF INTEREST

The author declares no conflict of interest, financial or otherwise.

FUNDING

The present study was financially supported by the NIRS/QST grant (Japan Agency for Medical Research and Development 16768966), in which Osaka City University was involved as a collaborating facility.

ACKNOWLEDGEMENTS

The authors thank Ms. M. Ando and Ms. N. Kotani (Osaka City University) for psychological tests.

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