电压门控钾离子通道对卵巢黄素化颗粒细胞增殖、分泌及凋亡的影响

目的 探讨电压门控钾离子通道(Kv)对人绒毛膜促件腺激素(hCG)诱导的卵巢黄素化颗粒细胞增殖、分泌及凋亡的影响.方法 收集2007年11月至2008年2月行体外受精-胚胎移植患者的卵泡液共25份,密度梯度法获得卵巢黄素化颗粒细胞,采用RT-PCR技术检测颗粒细胞中KvmRNA的表达.将培养贴壁后的颗粒细胞按干预方式分为空白组、4氨基吡啶(4-AP)组、hCG组和hCG+4-AP组共4组,hCG和4-AP的终浓度分别为1250 U/L、5 nmol/L.培养24 h后,采用化学发光法测定各组孕酮水平;采用流式细胞仪和分光光度法检测各组颗粒细胞的凋亡情况;采用四甲基偶氮唑监(MTT)比色法检测各组颗粒细胞的增殖、抑制情况.结果 (1)培养24 h后,空白组、4-AP组、hCG组和hCG+4.AP组颗粒细胞中的孕酮水平分别为(547 ±64)、(206 ±32)、(1991±172)和(763 ±79)nmol/L.4-AP组、hCG组分别与空白组比较,差异均有统计学意义(P<0.01);hCG+4-AP组与hCG组比较,差异也有统计学意义(P<0.01).(2)培养24 h后,4-AP组颗粒细胞抑制率为19.7%,与空白组(0)比较,差异有统计学意义(P<0.05);hCG+-AP组为34.6%,与hCG组(0)比较,差异也有统计学意义(P<0.01).4-AP组、hCG+4-AP组的颗粒细胞增殖率分别为80.3%、68.2%,分别与空白组(100%)比较,差异均有统计学意义(P<0.05、P<0.01);hCG组(100.4%)高于空白组,但差异无统计学意义(P>0.05).(3)培养24 h后颗粒细胞的凋亡率及半胱氨酸天冬氨酸蛋白酶(caspase-3)活性,4-AP组分别为(40±5)%和0.049 ±0.009,均高于空白组[(17±4)%和0.029±0.008],hCG+4-AP组[(25±4)%和0.039±0.008]也均高于hCG组[(15 ±3)%和0.022 ±0.007],差异均有统计学意义(P<0.01).结论 4-AP能够抑制卵巢黄素化颗粒细胞和经hCG诱导的颗粒细胞的孕酮分泌,町能与其抑制增殖、促进凋亡有关.Kv在卵巢黄素化颗粒细胞分泌、增殖及凋亡过程中起重要的作用.

Influence of 4-aminopyridine on human ovarian luteinized granulosa cell proliferation, production, and apoptosis through inhibiting voltage-gated K+ channel

Objective To study the influence of 4-aminopyridine(4-AP)on proliferation,production,and apoptosis through inhibiting voltage-gated K+channel(Kv)in ovarian luteinized granulosa cells.nethods Ovarian luteinized granulosa cells were recovered from 25 women with regular menses who underwent in vitro fertilization programme.The cultured granulosa cells were divided into 4 groups:blank group,4-AP treated group,human chorionic gonadotropin(hCG)-induced group and hCG+4-AP cotreated group.The final concentrations of hCG and 4-AP were 1250 U/L and 5 nmol/L respectively.The progesterone production WaS detected by the chemoluminescence method.The expression of Kv mRNA on human ovarian luteinized granulosa cell was detected by RT.PCR The influence on the early apoptosis of gTanulosa cells bv 4-AP was observed by flow eytometry.Cellular caSpage-3 activities were observed with colorimetric method and the inhibition of the cell proliferation was studied using methyl thiazolyl tetrazolium(MTT)method.Results(1)Kv mRNA wag expressed in granulosa cell.(2)The progesterone production64),(206±32),(1991±172)and(763±79)nmol/L,respectively after24 hours culture.Exposure of the(3)The flow cytometry analysis and the cellular caapase-3 A405 showed that 4-AP increased the percentage ofearly phase apoptosis(P<0.01):4-AP treated group VS blank group[(40±5)%and 0.049 ±0.009]VS[(17±4)% and 0.029±0.008],hCG+4-AP CO-treated group VS hCG-induced group[(25±4)%and0.039 ±0.0081 VS[(15±3)%and 0.022 ±0.007].(4)24 hours after treated with 4-AP and hCG,theinhibitory rate of cultured granulosa cells of 4-AP treated group was higher than the blank group(19.7%VS0).and that of hCG+4-AP co-treated group was obviously higher than hCG-induced group(34.6% VS O,P<0.01).Conclusions The voltage-gated K+ channels expressed by ovarian luteinized granulosa cellplay an important role in cell proliferation,production,and apoptosis.4-AP may inhibit differentiation ofprogesterone in granulosa ceHs through the inhibition of proliferation and induction of apoptosis.