AIM: Glucocorticoid (GC) resistant ulcerative colitis (UC) remains a serious disease and is difficult to manage. Although the molecular basis of GC insensitivity is still unknown, GC receptors (GR and GR) may play an important role in it. This study was aimed to investigate the relationship between the expression of GR and GR in colonic mucosal cells of patients with UC, the efficacy of GC therapy and the intensity of inflammation.
METHODS:Twenty-five cases of UC were classified into: GC sensitive (n = 16) and GC resistant (n = 9) cases. Patients consisted of mild (n = 6), moderate (n = 8) and severe (n = 11) cases. GR and GR expression in colonic mucosal specimens were investigated by immunohistochemistry, and compared between GC resistant and sensitive groups, and also among various degrees of inflammation.
RESULTS:All cases were positive for GR and GR expression. Both positive association between GR expression and the response of UC to GC and strong negative association between GR expression and the response of UC to GC were identified. There was no significant association between GR/GR expression and the degree of inflammation of UC.
CONCLUSION:These findings suggest that both GR and GR may play an important role in the action of GC, and that GR functions as a dominant negative inhibitor of GR. Expression of GR and GR in colonic mucosal cells of patients with UC may serve as predictors of glucocorticoid response, but can not function as markers of inflammatory intensity.