p38 MAPK抑制剂对热应激雌性雏鸡主要生殖激素分泌的影响

为探究p38 MAPK抑制剂SB203580对热应激雌性雏鸡主要生殖激素分泌的影响,将72只1日龄文昌鸡母雏随机分为对照组(CK)、热应激组(HS)和抑制剂组(HS+I),从第三周开始,每天中午12:00对HS、HS+I组雏鸡进行热应激2 h,每周龄末在热应激前30 min给HS+I组雏鸡腹腔注射SB203580(5 ...     

小型猪复合麻醉剂对大鼠中枢神经系统p-p38MAPK蛋白表达的影响

为研究小型猪复合麻醉剂(XFM)对大鼠中枢神经系统p-p38蛋白表达的影响,将30只大鼠分为对照组(C组)和麻醉剂组(M组),M组又分为4个亚组:M1组(注射XFM后大鼠翻正反射消失即刻)、M2组(注射XFM后大鼠翻正反射消失后1h)、M3组(注射XFM后大鼠翻正反射恢复即刻)和M4组(注射XFM后大鼠翻正反射恢复后1h),各组大鼠到达预定的时间点后分别采取脑组织,应用RT-PCR法检测脑内p38 mRNA转录量,应用Western blot方法检测中枢神经系统中p-p38蛋白的表达量。大鼠注射XFM后,与对照组比较,试验组大鼠大脑皮层和丘脑p38mRNA转录量显著降低(P0.05),在苏醒过程中有所恢复,但仍显著低于对照组(P0.05);大脑皮层和丘脑内p-p38蛋白的相对表达量,在M1、M2组的时间点显著低于对照组(P0.05或P0.01);大鼠注射XFM后,与对照组比较,试验组大鼠小脑、海马、脑干内p38mRNA转录量显著升高(P0.05),在苏醒过程中仍显著高于对照组(P0.05);小脑、海马、脑干内p-p38蛋白的表达量,在M1组、M2组、M3组显著升高,与对照组相比差异显著(P0.05或P0.01),在M4组表达量下降,与对照组相比差异不显著(P0.05)。结果表明,XFM诱导大鼠大脑皮层、丘脑内p38 mRNA及p-p38蛋白表达下调,p38 mRNA及磷酸化蛋白的改变可能是XFM作用的机制之一。     

miR-24-3p对猪颗粒细胞雌二醇合成的作用

旨在探究miR-24-3p对猪颗粒细胞雌二醇合成的影响。本试验收集180日龄健康母猪的卵巢组织,每次试验取20对卵巢进行颗粒细胞的分离培养,将miR-24-3p的mimics及inhibitor转染进颗粒细胞,通过ELISA、RT-qPCR、Western blot、双荧光素酶报告试验等技术探究miR-24-3p对猪颗粒细胞雌二醇合成的作用。结果表明,过表达miR-24-3p可显著促进雌二醇的合成(P<0.01),并加快StAR、CYP19A1和CYP11A1的转录和翻译(P<0.05);而干扰miR-24-3p则显著抑制雌二醇的合成(P<0.05),并显著下调CYP11A1、CYP19A1的mRNA和蛋白水平(P<0.05)。进一步研究发现,TOP1是miR-24-3p的直接靶基因,过表达miR-24-3p可显著抑制TOP1的表达(P<0.05),干扰miR-24-3p可显著上调TOP1的表达(P<0.05)。而过表达TOP1则可减弱miR-24-3p对颗粒细胞雌二醇合成的促进作用(P<0.05)。综上所述,miR-24-3p通过靶向TOP1...     

牦牛p38MAPK在雌性主要生殖器官中的表达

旨在研究p38MAPK在母牦牛主要生殖器官中的表达情况,了解其表达差异性,为牦牛的繁殖性能研究提供相关基础资料。本研究采集卵泡期、黄体期、妊娠期成年健康母牦牛(各2头)主要生殖器官样品,免疫组化技术检测p38MAPK蛋白的表达部位;qRT-PCR和Western-blot技术对其基因和蛋白进行相对表达量测定。结果:1)免疫组化结果显示,p38MAPK蛋白在牦牛的卵巢、输卵管和子宫均呈阳性表达;2)qRT-PCR结果表明,p38MAPK基因在卵巢中的表达量卵泡期显著高于妊娠期(P0.05);在输卵管中的表达量黄体期显著高于卵泡期和妊娠期(P0.05);在子宫中的表达量妊娠期极显著高于卵泡期和黄体期(P0.01);3)Western-blot结果显示,p38MAPK蛋白在卵巢中的表达量卵泡期极显著高于黄体期和妊娠期(P0.01);在输卵管中的表达量黄体期极显著高于卵泡期和妊娠期(P0.01);在子宫中的表达量妊娠期极显著高于卵泡期和黄体期(P0.01)。结果表明,p38MAPK在母牦牛同一生殖器官的不同繁殖阶段其表达存在差异性,其可能参与了牦牛卵泡发育、黄体功能发挥以及胚胎着床和发育等一系列生殖过程,为牦牛的繁殖性能研究提供相关基础资料。     

猪卵泡闭锁期间凋亡因子对颗粒细胞的影响

在哺乳动物卵巢中,约有99%的卵泡经历一个"闭锁"的退化过程,在卵泡发育期间仅有少数发育、排卵.多数未知的分子机制(包括细胞死亡配体-受体系统)是控制哺乳动物闭锁卵泡上颗粒细胞凋亡的主要因素,在猪卵巢颗粒细胞的报道中至少有5种细胞死亡配体-受体系统.文章阐述了猪卵泡闭锁期间凋亡因子对颗粒细胞的影响.     

一氧化氮对猪腔前卵泡颗粒细胞凋亡的影响

本试验旨在研究在培养液中添加不同浓度的NO供体硝普钠(sodium nitro-prusside,SNP)(0、0.001、0.01、0.1、1.0 mmol/L)处理,研究培养4 d后的腔前卵泡颗粒细胞凋亡情况。结果表明,1.0 mmol/L SNP组凋亡率显著高于其他各组(P0.05),而0.001 mmol/L SNP组凋亡率显著低于其他各组(P0.05)。说明高浓度的SNP对猪腔前卵泡颗粒细胞凋亡起促进作用,低浓度的SNP起抑制作用。     

丹参地上部分丹酚酸A的抗炎活性及对p38MAPK通路的影响

为了观察丹参地上部分提取物丹酚酸A(SAA)对脓毒症的影响及对p38 MAPK通路的调控作用,试验采用脂多糖(LPS)诱导体内、外脓毒症模型,分为空白组(生理盐水或细胞培养液)、LPS(LPS 100 ng/mL)组、SAA各剂量(125,5,25,1μg/mL)组、阳性对照地塞米松(200μg/mL)组,采用MTT法检测SAA对RAW264.7细胞活性的影响,ELISA法检测肿瘤坏死因子α(TNF-α)、白细胞介素(IL)-6、IL-10的含量,H.E.染色法观察SAA对肺脏组织的影响,采用Western-blot方法检测其对p38 MAPK通路的调控作用。结果表明:与LPS组比,地塞米松组和SAA各剂量组细胞活性均有提高,差异显著或极显著(P0.05或P0.01),且呈剂量依赖性;与LPS组比,地塞米松组和SAA各剂量组TNF-α、IL-6含量显著或极显著降低(P0.05或P0.01),地塞米松组和SAA各剂量组(除SAA 5μg/mL组外)IL-10含量均极显著升高(P0.01);SAA能够减轻肺脏充血及肿胀情况;p38 MAPK通路在体内、外均被抑制。说明SAA能够改善LPS对细胞活性的影响,对脓毒症模型中TNF-α、IL-6的生成具有抑制作用,对IL-10的生成具有促进作用,其机制与p38 MAPK的表达有关。     

miR-15a对猪卵泡颗粒细胞BDNF基因表达的影响

为探索miR-15a对猪卵泡发育的影响,选取健康大卵泡、中等卵泡和闭锁卵泡,研究不同卵泡中miR-15a的相对表达量以及其是否对卵巢颗粒细胞中有BDNF表达具有调节作用。分别抽取直径3-5 mm、大于5 mm健康卵泡和3-5 mm闭锁猪卵泡,采用q PCR检测发现闭锁卵泡中miR-15a表达显著升高。免疫组化结果显示中等健康卵泡颗粒细胞上BDNF、Tr KB均有表达,而在靠近卵泡腔的凋亡颗粒细胞BDNF免疫阳性反应较弱。分离培养猪卵巢颗粒细胞,过表达miR-15a能显著上调BDNF基因表达水平,Bcl-2基因表达有下降趋势但差异不显著;抑制miR-15a表达能显著抑制BDNF、bcl-2基因表达水平。Western-Blot结果发现,过表达miR-15a显著下调BDNF蛋白水平,而抑制miR-15a表达则能显著上调BDNF蛋白水平。实验结果显示miR-15a可能经由其靶基因BDNF参与猪卵泡的发育和闭锁。     

miR-495-3p对山羊卵巢颗粒细胞功能的影响

旨在探究miR-495-3p对山羊卵巢颗粒细胞功能的影响及作用机制.本研究选取健康的3～4月龄大足黑山羊母羊,收集卵巢颗粒细胞,利用miR-495-3p模拟物(mimics)和抑制物(inhibitor)构建过表达和抑制模型,通过流式细胞术检测细胞凋亡和周期,ELISA分析颗粒细胞的雌二醇(E2)和孕酮(P4)分泌,采...     

The Influence of Opioid Peptides on Steroidogenesis in Porcine Granulosa Cells

The present studies were undertaken to examine the influence of mu (beta-endorphin, DAMGO, FK 33-824), delta (met-enkephalin, leu-enkephalin, DPLPE) and kappa opioid receptor agonists (dynorphin A, dynorphin B, U 50488) used at different doses (1-1000 nM) alone and in combination with LH (100 ng/ml) on steroidogenesis in porcine granulosa cells derived from large follicles. The effects of mu, delta and kappa receptor agonists on both basal and LH-induced progesterone (P4) secretion were negligible. Agonists of mu opioid receptors reduced basal androstenedione (A4), testosterone (T) and oestradiol (E2) release. Co-treatment with LH entirely abolished the inhibitory effect of these agonists on A4 and E2 secretion and resulted in an increase in T release. The addition of delta receptor agonists was followed by a decrease in basal A4, T and E2 secretion. The cells incubated in the presence of LH increased the androgen production and abrogated the inhibitory effect of delta agonists on E2 output. Basal A4, T and E2 release was also suppressed by kappa receptor agonists. The presence of LH in culture media extended the inhibitory effect of these opioids on E2 output and caused either abolition of the inhibitory influence of kappa agonists or even augmentation of both androgen release in response to the opioids. In conclusion, these data support the involvement of three major types of opioid receptors in the regulation of porcine granulosa cell steroidogenesis.     

猪三种不同直径卵泡中颗粒细胞的比较研究

为探究不同直径有腔卵泡中猪卵巢颗粒细胞的生理机能差异,以期为后续生殖毒理学研究奠定基础。采用剖剪法获取猪卵巢内三种直径范围的有腔卵泡（小型〈2mm,中型2-5mm,大型≥5mm）并获得颗粒细胞,台盼蓝染色方法计算细胞存活率,倒置显微镜下观察细胞形态并计算细胞纯度,实时定量方法检测促卵泡刺激素受体基因（FSHR）及促黄体生成素受体基因（LHR）的表达进一步鉴定颗粒细胞,四甲基偶氮唑蓝（MTT）法测定细胞生长曲线。结果显示从大中小三种不同直径有腔卵泡中获得的猪卵巢颗粒细胞存活率分别为68%、75%、72%,纯度分别为97%、95%、90%;细胞生长曲线表明,从24h开始进入对数生长期,并于120h达到最大值,且中型卵泡中获得的颗粒细胞生长增殖状态最佳;实时定量结果显示FSHR在猪三种直径的有腔卵泡颗粒细胞中均表达阳性,且呈现差异。     

颗粒细胞对卵泡发育的影响

卵泡发育是一个复杂的生理过程,通过间隙连接,颗粒细胞在卵母细胞的生长发育过程中起营养作用,并促进卵母细胞的成熟;颗粒细胞和膜细胞的相互作用是卵泡发育和维持正常功能的重要条件。作为卵泡发育的标志,颗粒细胞的生长分化是原始卵泡启动和生长的关键,并通过受体介导途径调控生长期卵泡的发育及卵泡闭锁,从而在卵泡发育过程中起重要的调控作用。     

miR-10b和BDNF对山羊卵巢颗粒细胞活性的影响

为研究miR-10b对山羊卵巢颗粒细胞活性的影响,从已建立的多羔(3～5只)和单羔奶山羊发情期卵巢组织差异表达的miRNAs文库中筛选出差异表达显著的miR-10b,并利用生物信息学和实时定量PCR等技术,研究miR-10b在单羔和多羔奶山羊中的相对表达水平及其靶基因表达和卵巢颗粒细胞活性。结果显示:miR-10b在单羔奶山羊卵巢组织中的相对表达量显著高于多羔奶山羊卵巢组织中的相对表达量(P0.05);miR-10b通过抑制脑源性神经营养因子(BDNF)基因的表达,实现对卵巢颗粒细胞活性的抑制作用。试验结果阐释了miR-10b作用于奶山羊卵巢颗粒细胞的机理,为后续研究山羊卵巢的卵泡发育提供了依据。     

花生四烯酸对家禽卵泡颗粒细胞的影响

花生四烯酸是一类顺式多不饱和脂肪酸,是动物细胞膜磷脂的重要组成部分。在家禽生产中,花生四烯酸作为一种必需脂肪酸调控家禽的生长发育;而且作为功能性营养因子,通过在禽蛋中的蓄积来满足人体需求。除了作为前列腺素合成的前体物调节动物生殖过程外,花生四烯酸在调节卵泡颗粒细胞功能的过程中也起重要作用。     

Maternal Liver Damage Delays Meiotic Resumption in Bovine Oocytes through Impairment of Signalling Cascades Originated from Low p38MAPK Activity in Cumulus Cells

The main objective of the present study is to investigate the molecular mechanism underlying the delay in progression of nuclear maturation in oocytes derived from cows with damaged livers (DL cows), which was previously reported. In present study, delayed progression of nuclear maturation of oocytes derived from DL cows relative to oocytes derived from cows with healthy livers (HL cows) was accompanied by low maturation promoting factor (MPF) activity (0.43 fold, p < 0.05). When cumulus cells were removed from cumulus‐oocyte complexes and the denuded oocytes were cultured, there was no difference in the progression of nuclear maturation between the two liver conditions. In addition, gap junctional communication (GJC) between the oocyte and cumulus cells was higher in DL cows than in HL cows at 3 and 7 h of in vitro maturation (IVM) (p < 0.05). Supplementation of IVM medium with epidermal growth factor (EGF) increased the ratio of germinal vesicle breakdown (GVBD) of oocytes derived from DL cows to the level seen in oocytes derived from HL cows. Additionally, the level of p38MAPK phosphorylation at 0 h of IVM was significantly lower in cumulus cells derived from DL cows than in cumulus cells derived from HL cows (HL cows, 53.5%; DL cows, 28.9%; p < 0.05). Thus, a low level of p38MAPK phosphorylation in cumulus cells induced slow GJC closure between oocyte and cumulus cells, which resulted in slow meiotic maturation of oocytes derived from DL cows.     

Immunohistochemical Localization of Androgen Receptor in Two Subpopulations of Porcine Granulosa Cells In Vitro

In the ovarian follicles of mammals, androgens are utilized as substrates for estrogen synthesis or can act via androgen receptor (AR). Within the ovary, granulosa cells generally display the strongest immunoreactivity for AR protein. Therefore, the aim of the present study was to analyse possible changes in the intensity of AR staining in cultured mural and antral granulosa cells isolated from follicles at various stages of development. Porcine ovaries were obtained at a local slaughterhouse and the follicles were classified as small, medium and large dependently on their diameter. Isolated granulosa cells were separated into two populations, mural and antral, and then the cells were cultured during 48 h. After this time the cells were fixed and immunostained to visualize the AR. Androgen receptor immunostaining was detected in both, antral and mural granulosa cell cultures isolated from follicles at all stages of the development. In the mural granulosa cultures the immunostaining was comparatively weaker than that in the antral granulosa cells originating from all types of follicles. Our results provide immunohistochemical evidence that antral granulosa layer is the main site of AR immunoexpression.