甘油三酯对体外培养大鼠胰岛细胞功能的影响

目的研究甘油三酯对胰岛细胞分泌功能的影响。方法体外分离SD大鼠胰岛细胞并进行单层细胞培养,以不同浓度(0、0.5、2.5、5.0 10.0 mmol/L)甘油三酯与胰岛细胞共同孵育72 h后,进行葡萄糖负荷试验,放射免疫法检测培养液中胰岛素水平,以评价胰岛细胞功能变化;同时采用油红染色方法,光镜下观察细胞内脂肪堆积情况。结果低糖(2.8 mmol/L)刺激下,甘油三酯对胰岛细胞的胰岛素分泌无明显影响,高糖(27.8 mmol/L)负荷下,高浓度甘油三酯(5.0、10.0 mmol/L)可抑制胰岛细胞的胰岛素分泌(P<0.05);油红染色见甘油三酯处理组胰岛细胞内均有脂肪堆积,尤以高浓度组明显。结论甘油三酯可导致体外培养胰岛细胞内脂肪堆积,抑制细胞的分泌功能。

Effect of triglycerides on rat islet cell function in vitro

Objective To study the effect of triglycerides (TGs) on the function of in vitro cultured rat islet cells. Methods SD rat islet cells were isolated for monolayer cell culture and treated with TGs at different concentrations (0, 0.5, 2.5, 5.0, 10.0 mmol/L) for 72 h. Insulin level in the cell culture media was measured after glucose loading test, and the deposition of fat droplets in the islet cells observed by oil red O-staining. Results No obvious effect was observed after a 72-h incubation of the islet cells with TGs at low glucose level (2.8 mmol/L), while with the stimulation of high-level glucose (27.8 mmol/L), the insulin secretion was significantly inhibited by TGs of higher concentrations (5.0, 10.0 mmol/L). The deposition of fat droplets was found in the islet cells after incubation with TGs, with TGs of higher concentrations. Conclusion TGs induces deposition of fat droplets in islet cells in vitro, and may inhibit the insulin-secreting function of the cells.