Abstract
Inhibin A regulates follicular development, and its expression level is related to physiological activities, such as the recruitment, selection, and predominance during follicular development. Therefore, examining inhibin A and its regulatory effects on the reproductive performance of poultry is crucial. In this study, we measured the mRNA and protein abundances of INHA and INHBA in the chicken reproductive system and determined the hormone secretion and apoptosis of follicular granulosa cells (GCs) after being treated with inhibin A protein, and flow cytometry was performed to analyze GC apoptosis in INHA-specific small RNA interference (siRNA). We detected that INHA and INHBA were mainly expressed in chicken follicles. The highest INHA mRNA abundance was found in the fifth largest preovulatory follicle (F5) (P < 0.05). INHBA mRNA expression in the largest preovulatory follicle (F1) was significantly higher than those in other follicles (P < 0.05). Similar results were found for INHA and INHBA protein expression in those follicles (P < 0.05). Treatment with inhibin A protein increased the activity of GCs in a dose-dependent manner (P < 0.05), which was characterized by decreased gene expression of pro-apoptotic factors Bax and Caspase-3 (P < 0.05) and increased expression of proliferation genes Bcl-2 and PCNA (P < 0.05). Additionally, inhibin A significantly increased the secretion of progesterone and estradiol (P < 0.05). RNAi-mediated knockdown of INHA increased apoptosis in GCs via a Caspase-3-dependent mitochondrial pathway.
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Funding
This research was supported the Modern Agricultural Industry Technology System (CARS-41), the National Natural Science Foundation of China (Grant No. 31872347), and the Sichuan Provincial Improving Poverty Founding (Grant No. 2017NFP0211). We deeply appreciate Dr. Wei Zhang from Department of Animal Science, the University of Maryland for giving great comments on this manuscript.
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XZ and ZC conceived and designed the experiments; XZ, ZC, and LL performed the experiments; ZC, QZ, YW, HY, DL, YT, and GS analyzed the data; ZC and XZ wrote the paper.
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All experimental procedures in the present study complied with the recommendations of the Animal Care and Use Committee of Sichuan Agricultural University, and the study was approved by the Animal Care and Use Committee of Sichuan Agricultural University (Sichuan, China) under permit no. YCS-B2018102013.
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Cui, Z., Liu, L., Zhu, Q. et al. Inhibin A regulates follicular development via hormone secretion and granulosa cell behaviors in laying hens. Cell Tissue Res 381, 337–350 (2020). https://doi.org/10.1007/s00441-020-03207-8
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DOI: https://doi.org/10.1007/s00441-020-03207-8