牛卵泡颗粒细胞CART与候选受体的分子对接及其功能
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国家自然科学基金项目(31873002);山西省应用基础研究计划面上项目(20210302123380);山西省现代农业产业技术体系建设专项


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    摘要:

    通过同源建模预测牛卵泡颗粒细胞(GCs)可卡因–苯丙胺转录肽(CART)与候选受体ZMPSTE24的三维结构,运用分子对接技术分析二者的结合模式,探究其分子互作关系;选取3头健康成年母牛,分离GCs,转染TEDDM1、CMKLR1、AGTR2、ZMPSTE24沉默序列,提取总RNA,并采用qRT–PCR检测TEDDM1、AGTR2、CMKLR1、ZMPSTE24等4个候选受体沉默后mRNA的相对表达量;采用CCK–8法测定各试验组和对照组GCs增殖情况;采用ELISA法检测各组培养液中雌激素(E2)的质量浓度,研究此4个候选受体在牛卵泡GCs中的功能。结果表明:ZMPSTE24与CART存在1个结合位点、9个盐桥、17个氢键;4个候选受体试验组的mRNA相对表达量均极显著(P<0.01)低于siNC组和空白组的,表明TEDDM1、CMKLR1、AGTR2、ZMPSTE24在GCs中沉默效果良好;TEDDM1、CMKLR1、AGTR2、ZMPSTE24沉默后,各试验组的细胞增殖率和培养液中E2质量浓度均极显著(P<0.01)低于阳性对照组(不加CART)的。可见,4个候选受体基因沉默后,CART对GCs增殖和E2分泌仍具有抑制作用。

    Abstract:

    The three-dimensional structure of Cocaine Amphetamine Transcription Peptide(CART) and the candidate receptor ZMPSTE24 in bovine follicular granulosa cells(GCs) were predicted using homologous modeling. The binding mode between these two molecules was analyzed through Macromolecular docking technology to explore their molecular interactions. Follicular GCs were isolated from three healthy adult cows and transfected with silenced sequences for TEDDM1, CMKLR1, AGTR2 and ZMPSTE24. Total RNA was extracted, and qRT-PCR was employed to assess the relative mRNA expression after silencing the four candidate receptors(TEDDM1, AGTR2, CMKLR1 and ZMPSTE24). The proliferation of GCs in both experimental and control groups was evaluated using the CCK-8 method. Additionally, the mass concentration of estrogen(E2) in the culture medium of each group was determined using the ELISA method, aiming to investigate the functions of these four candidate receptors in bovine follicular GCs. The results revealed one binding site, nine salt bridges, and seventeen hydrogen bonds between ZMPSTE24 and CART. The relative mRNA expression levels of the four candidate receptor test groups were significantly(P<0.01) lower than those of the siNC group and blank group, confirming effective silencing of TEDDM1, CMKLR1, AGTR2 and ZMPSTE24 in GCs. Following the silencing of TEDDM1, CMKLR1, AGTR2 and ZMPSTE24, the cell proliferation rate and E2 mass concentration in the culture medium of each experimental group were significantly(P<0.01) reduced compared to the positive control group(without CART). These findings indicated that even after the silencing of the four candidate receptor genes, CART continues to exert inhibitory effects on GCs proliferation and E2 secretion.

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郝琴琴,任静,成俊丽,朱芷葳,许冬梅,贾雪纯,李鹏飞.牛卵泡颗粒细胞CART与候选受体的分子对接及其功能[J].湖南农业大学学报:自然科学版,2023,49(4):.

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  • 在线发布日期: 2023-09-05
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