冯友亮尹营营王新生王沛涛.双酚A 干扰大鼠生精过程时TJ 渗透性屏障的体外研究[J].,2012,12(8):1430-1434 |
双酚A 干扰大鼠生精过程时TJ 渗透性屏障的体外研究 |
BPA Disturb TJ- Permiablity of Rat Sertoli Cells DuringSpermatogenesis in Vitro |
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DOI: |
中文关键词: 双酚A 精子形成 紧密连接 支持细胞连接蛋白 |
英文关键词: Bisphenol A Spermatogenesis Tight junction Sertoli cell junctional proteins |
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中文摘要: |
目的:研究体外大鼠睾丸支持细胞紧密连接蛋白(SCJP)在类雌激素- 双酚A(BPA) 干扰下的损伤机制。方法:对Wistar 大鼠
睾丸支持细胞(Sertoli 细胞)离体原代培养4-5d,通过双室培养模型建立体外紧密连接(TJ)渗透性屏障,并测量其跨上皮电阻值
(TER)反应紧密连接结构的形成及BPA 对紧密连接的损害程度。设溶剂(DMSO)做阴性对照, 以终浓度为25μM、100μM 的BPA
作用于支持细胞24h,MTT 法测不同浓度BPA 作用的Sertoli 细胞增殖活性。Western bloting 观察occludin、ZO-1、Cx43 表达的变
化。结果:成功分离并培养Wistar 大鼠睾丸支持细胞,并建立良好的体外TJ 屏障模型。双室培养支持细胞上皮TER 值在培养的
d4 达到顶峰,然后在d4-9 维持相对较稳定的状态,d4 以200μM,100μM,25μM BPA 染毒,分别于染毒后24,48,72,96 和120h
测TER:与DMSO 溶剂对照组相比,200μM,100μM 的BPA 组TER 值明显下降(P<0.05),而25μM 的BPA 组在染毒后TER 值
无明显变化(P>0.05)。MTT 结果显示:经不同浓度BPA 作用24h 后,Sertoli 细胞的吸光度(OD 值)随着染毒剂量的增加而逐渐
降低。102 、103μM 浓度组与溶剂对照组有显著性差异(P<0.05),而10-2、10-1、100、101μM 组和溶剂对照组无显著性差异(P>
0.05)。Western blot 结果显示:occludin、ZO-1、Cx43 在各剂量组均有表达,与溶剂对照组相比,occludin、ZO-1 表达均分别随作用剂
量的增加而降低:25μM 组、100μM 组与溶剂对照组相比,差异均存在显著性(P<0.05);100μM 组与25μM 组相比,差异亦存在
显著性(P<0.05)。Cx43 的表达却随染毒剂量的增加而增加,与溶剂对照组相比,25μM 组表达无明显增加(P>0.05),而100μM 组
则明显增加(P<0.05);与25μM 组相比,100μM 组表达明显增加(P<0.05)。结论:双酚A 可通过损伤支持细胞连接蛋白正常表
达,破坏了TJ 屏障渗透性,从而影响正常的精子形成过程。 |
英文摘要: |
Objective: To investigate the effects of BPA exposure on the testicular expression of Sertoli cell junctional proteins
(SCJP) in male rats during spermatogenesis. Methods: Primary sertoli cells were isolated and cultured from Wistar rat for 4-5 days, and
the tight junction-permeability barrier was established by dual-chamber culture model. The effect of BPA on tight junctions was
measured by the method of transepithelial electrical resistance (TER) assay. With a series of concentration BPA (0,25,and 100μM)
co-incubating the Sertoli cells in vitro for 24h, cell proliferative activity was assessed with MTT assay, and the expression of occludin,
ZO-1, Cx43 were determined by Western blotting. Results: BPA perturbs the integrity of the TJ-permeablity in Sertoli cells in vitro,
which was associated with the decline of selected proteins at the tight junction, and gap junction at the blood-testis barrier. The
expression of Cx43 increased while the expression of occludin and ZO-1 reduced in the Sertoli cell following BPA treatment.
Conclusion: The present study showed that occludin, ZO-1 and specifically Cx43 could be early targets for BPA, which may be one of
the contributing factors leading to impairment in spermatogenesis. |
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