Effect of 1,25-dihydroxyvitamin D_3 on immune intervention in NOD mice / 中华内分泌代谢杂志

ABSTRACT

Objective To investigate the preventive effect of 1,25-dihydroxyvitamin D_3 〔1,25-(OH)_2D_3〕 on type 1 diabetes in cyclophosphamide-treated NOD mice. Methods Twenty female NOD mice were administered 280 mg/kg cyclophosphamide by a single intraperitoneal injection at the beginning of the experiment and then divided into two equal groups. Group 1 received intraperitoneal injection of 5 ?g/kg 1,25-(OH)_2D_3 every other day; Group 2 received the intraperitoneal injection of peanut oil in the same volume as control. When the experiment was finished on the 30th day, the incidence of diabetes and the degree of insulitis were observed. The expressions of bcl-2 and bax in islets were detected with immunohistochemical technique. The apoptosis rate of spleen T lymphocyte was also measured by flow cytometry quantitative analysis. Results Intraperitoneal injections of 1,25-(OH)_2D_3 to NOD mice reduced the incidence of diabetes (10% vs 70%, P