Table 3: Substances which can increase CAMP gene expression.

          Substance           References
          1,25-dihydroxyvitamin D3            [23, 28]
          Butyrate            [29, 31]
          Trichostatin A            [31]
          Lithocholic acid            [32]
          Lipopolysaccaharide            [25]
          Interleukin-6            [25]
          Retinoic acid            [25]