脂肪酸参与糖尿病状态下肝细胞上CYP1A2功能与表达的上调

Fatty acid participates in up-regulation of diabetes on function and expression of CYP1A2

目的糖尿病上调肝脏CYP1A2的功能与表达,但机制尚未明确。本研究拟从脂肪酸角度,通过体外研究初步探索糖尿病上调肝脏CYP1A2功能与表达的作用机制。方法通过测定CYP1A2底物非那西丁代谢水平考察肝细胞HepG2和Fa2N-4细胞上CYP1A2的酶活性,通过荧光实时定量PCR方法检测细胞上CYP1A2 mRNA表达水平。分别用糖尿病大鼠(Ⅰ型和Ⅱ型)和正常大鼠血清培养HepG2细胞48 h,考察细胞上CYP1A2的功能。在培养基中加入不同浓度的饱和脂肪酸(软脂酸和硬脂酸)和不饱和脂肪酸(油酸和亚油酸)培养HepG2和Fa2N-4细胞48 h,测定细胞上CYP1A2的功能与表达。结果Ⅰ型和Ⅱ型糖尿病大鼠血清培养的HepG2细胞上CYP1A2酶活性明显增高。高浓度的脂肪酸均可增加2种细胞上CYP1A2功能与表达。结论糖尿病状态下脂肪酸浓度的异常变化可能是影响肝脏CYP1A2功能与表达上调的原因之一,本研究为进一步探索糖尿病状态下肝脏CYP1A2改变机制提供了一定的基础。

Aim To investigate the mechanism of dia-betes changing the hepatic CYP1 A2 through in vitro cell culture study.Methods The function of CYP1 A2 in HepG2 and Fa2N-4 cells were evaluated by determi-ning the level of phenacetin metabolism,and the mR-NA expression of CYP1 A2 in cells was detected by real time PCR.HepG2 cells were co-cultured with serum of diabetic rats（type 1 and type 2）and normal rats,then the CYP1 A2 function in cells were evaluated.Then, the HepG2 and Fa2N-4 cells were co-cultured with a series of concentrations of saturated （including palmitic acid and stearic acid）and unsaturated fatty acids（in-cluding oleic acid and linoleic acid）for 48 h,and the function and expression of CYP1 A2 in the cells were compared.Results It was found that the activities of CYP1 A2 were higher in cells incubated with diabetic serum of both type.All high concentration of fatty acids could increase the function and expression of CYP1 A2 in both HepG2 and Fa2N-4 cells.Conclusion It is speculated that the abnormal level of fatty acids under diabetic state might be part of the reasons why diabetes change the hepatic CYP1 A2,which provides the basis for future study.