Thiobenzothiazole-modified Hydrocortisones Display Anti-inflammatory Activity with Reduced Impact on Islet {beta}-cell Function [Metabolism]

April 7th, 2015 by Burke, S. J., May, A. L., Noland, R. C., Lu, D., Brissova, M., Powers, A. C., Sherrill, E. M., Karlstad, M. D., Campagna, S. R., Stephens, J. M., Collier, J. J.

Glucocorticoids (GCs) signal through the glucocorticoid receptor (GR) and are administered clinically for a variety of situations, including inflammatory disorders, specific cancers, rheumatoid arthritis, and organ/tissue transplantation. However, GC therapy is also associated with additional complications, including steroid-induced diabetes. We hypothesized that modification of the steroid backbone is one strategy to enhance the therapeutic potential of GR activation. Towards this goal, two commercially unavailable, thiobenzothiazole-containing derivatives of hydrocortisone (termed MS4 and MS6) were examined using 832/13 rat insulinoma cells and rodent and human islets. We found that MS4 had transrepression properties, but lacked transactivation ability, while MS6 retained both transactivation and transrepression activities. In addition, MS4 and MS6 both displayed anti-inflammatory activity. Furthermore, MS4 displayed reduced impact on islet β-cell function in both rodent and human islets. Similar to dexamethasone, MS6 promoted adipocyte development in vitro, whereas MS4 did not. Moreover, neither MS4 nor MS6 activated the PECPK gene in primary rat hepatocytes. We conclude that modification of the functional groups attached to the D-ring of the hydrocortisone steroid nucleus produces compounds with altered structure-function GR agonist activity with decreased impact on insulin secretion, reduced adipogenic potential, but with preservation of anti-inflammatory activity.