促卵泡素对雏鸡原始卵泡形成的影响

Effects of follicle stimulation hormone on primordial follicle formation in chicks

  • 摘要: 【目的】 探究促卵泡素(FSH)对雏鸡原始卵泡形成的影响,为开展雏鸡卵巢的早期发育及提高蛋鸡产蛋性能的研究提供理论依据。【方法】 将40只刚出壳雏鸡随机分为试验组(FSH)和对照组(CK),分别肌肉注射20 IU/mLFSH和生理盐水。试验开始后0和5.5 d称取雏鸡体重,5.5 d采集雏鸡卵巢组织进行石蜡切片、HE染色和转录组测序(RNA-Seq)分析。通过生物信息学分析筛选差异表达基因(DEGs),并进行GO功能注释和KEGG信号通路富集分析。将DEGs上传STRING数据库构建蛋白互作(PPI)网络。最后通过实时荧光定量PCR检测基因相对表达量。【结果】 与CK组相比,FSH组雏鸡体重无显著变化(P>0.05,下同),卵巢体积明显增大。HE染色结果表明,FSH组卵巢皮质较厚,卵巢组织更致密,原始卵泡数量增多且体积增大,能明显看到原始卵泡结构。2组雏鸡卵巢中共存在617个DEGs,FSH组有107个,CK组有510个。GO功能注释和KEGG信号通路富集分析结果表明,DEGs注释到的GO功能条目可分为生物学过程、细胞组分和分子功能三大类,主要富集到PI3K-AKT、Wnt/β-catenin、MEK/ERK和MEK1/2/ERK1/2信号通路。实时荧光定量PCR结果显示,与CK组相比,FSH组DAZL和PIWIL1基因相对表达量极显著降低(P<0.01,下同),SMAD2、ZP1CYP17A1基因相对表达量显著(P<0.05)或极显著升高,FSHR基因相对表达量无显著变化。【结论】 FSH可能是通过影响颗粒细胞增殖、类固醇生成和血管生成等多条卵泡发育相关信号通路来促进雏鸡原始卵泡形成,其对CYP17A1、SMAD2ZP1等基因的调控可能是其促进原始卵泡生成的主要分子机制之一。

     

    Abstract: 【Objective】 To investigate the effect of follicle stimulating hormone(FSH)on the formation of primordial follicles in chicks,which could provide theoretical basis for research on the early development of the ovary in chicks and the improvement of egg-laying performance in laying hens. 【Method】 Forty freshly fledged chicks were randomly divided into test group(FSH)and control group(CK),and were injected intramuscularly with equal amounts of 20 IU/ mL FSH and saline respectively. The chicks were weighed at 0 and 5.5 d after the start of the experiment,and the ovarian tissues were collected at 5.5 d for paraffin sectioning,HE staining and transcriptome sequencing(RNA-Seq)analysis. Differen‐ tially expressed genes(DEGs)were screened by bioinformatics analysis,and GO function annotation analysis and KEGG signal pathway enrichment analysis were performed. The DEGs were uploaded to the STRING database to construct the protein interaction(PPI)network. Finally,the relative gene expression was detected by real-time fluorescence quantitative PCR. 【Result】 Compared with the CK group,there was no significant change in the body weight of the chicks in the FSH group(P>0.05,the same below),and the volume of the ovary increased greatly;HE staining results showed that the ovarian cortex was thicker in the FSH group,the ovarian tissues were denser,the number of primordial follicles was increased and their volume was enlarged and the primordial follicular structure could be clearly seen. There were 617 DEGs in the ovaries of the 2 groups,107 in the FSH group and 510 in the CK group. The analysis of GO function annotation and KEGG signal pathway enrichment showed that the GO function entries annotated by DEGs could be classified into 3 major categories:biological processes,cellular components and molecular functions,and were mainly enriched in the signal pathways such as PI3K-AKT,Wnt/β-catenin,MEK/ERK and MEK1/2/ERK1/2. The results of real-time fluores‐ cence quantitative PCR showed that compared with the CK group,the relative expression of DAZL and PIWIL1 genes in the FSH group was extremely significantly decreased(P<0.01,the same below),the relative expression of SMAD2,ZP1 and CYP17A1 genes was significantly(P<0.05)or extremely significantly increased,and there was no significant change in the relative expression of FSHR genes. 【Conclusion】 FSH may promote the formation of primordial follicles in chicks by affecting several signal pathways related to follicular development,such as granulosa cell proliferation,steroidogenesis and angiogenesis,and its regulation of genes such as CYP17A1,SMAD2 and ZP1 may be one of the main molecular mechanisms to promote primordial folliculogenesis.

     

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