ABSTRACT
Objective To investigate the effects of differentiated 3T3-L1 adipoeytes on inflammation of rat islet cells,as well as the protective effect of a-lipoic acid on the inflammation in vitro.Methotis Rat islet cells were divided into three groups:the control group,the experimental co-culture system group(cocuhured with differentiated mature 3T3-LI adipoeytes)and the intervention group (cocuhured with mature 3T3-LI adipocytes containing 4 μg/ml a-lipoic acid).Insulin releasing lest wag performed for estinmting the function of islet cells in culture supernatant of difierent groups.At the same time,the expression level of IKKIβin islet cells Was detected by western blot and realtime PCR.Results There was significant decrease of insulin stimulation index (SI) in experimental co-culture system group compared with the control group and intervention group(1.0 ±0.1 vs 2.6±0.2,2.5±0.5 respectively;P<0.01),while,the mRNA(4.62±0.60 vs1.00±0.46 and 2.25±0.75;P<0.01)and protein expression of IKKβ were significandy increased in the experimental group as compared with the other two groups.Conclusions In the co-culture system of adipocytes/islet cells,impaired function of islet cells could be induced by IKKβ activation,IKKβ Was a key molecule in inflamnmtion signal pathway in islet cells and could be activated by 3T3-LI adipocytes.a-lipoic acid Was able to reverse the impaired function of islet cells by suppressing IKKβ expression.