To determine whether sepimostat mesilate inhibits activation of the complement pathways, and to
evaluate the effectiveness of sepimostat mesilate on the development of glomerulonephritis in NZB/W F1 mice.
We used the Wielisa complement functional kit to assess the inhibitory effect of sepimostat mesilate on
activation of the complement pathways. Groups of 10 NZB/NZW mice (age 18-22 weeks) were given sepimostat mesilate
(200 μg/dose) or glucose (control) five times a week for 5 weeks after onset of proteinuria.
Sepimostat mesilate dose-dependently inhibited the activity of all complement pathways. Administration of
sepimostat mesilate after disease onset lowered the levels of blood urea nitrogen (243.2 ± 63.1 versus 120.9 ± 22.1 μg/dl;
p<0.0001), C4d (0.244 ± 0.083 versus 0.153 ± 0.059 ng/dl; p=0.011), and delayed the development of proteinuria (0.822 ±
0.116 versus 0.470 ± 0.093 mg/mouse/day; p=0.046) at the end of treatment (22 weeks of age). After discontinuation of
administration, blood urea nitrogen, C4d level, and proteinuria rapidly became elevated with no difference between the
groups. Eventually, mortality was similar between treated and untreated mice.
Sepimostat mesilate could be a therapeutic option for lupus nephritis.
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