MiR-145 regulates steroidogenesis in mouse primary granulosa cells by targeting Arpc5 and subsequent cytoskeleton remodeling

• Main Authors: Lanfang MA (Author), Shuo WANG (Author), Jun YANG (Author), Weicheng TANG (Author), Zhangying WU (Author), Lili CAO (Author), Aiyue LUO (Author), Fangfang FU (Author), Shuhong YANG (Author), Shixuan WANG (Author)
• Format: Book
• Published: The Society for Reproduction and Development, 2023-04-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.
• Notes: 0916-8818; 1348-4400; 10.1262/jrd.2022-137
• Keywords: arpc5; cytoskeleton; granulosa cell; microrna (mir)-145; steroidogenesis; Reproduction; QH471-489; Internal medicine; RC31-1245
• Source: The Journal of Reproduction and Development, Vol 69, Iss 3, Pp 154-162 (2023)

MicroRNA (miR)-145 is enriched in the follicular granulosa cells (GCs) of 3-week-old mice. Downregulating miR-145 inhibits the proliferation and differentiation of GCs and induces evident changes in their cytoskeleton. In this study, we examined how miR-145 induces cytoskeletal changes in mouse GCs and its potential mechanism in regulating GC steroidogenesis. We found that actin related protein 2/3 complex subunit 5 (Arpc5) is a target of miR-145. The miR-145 antagomir increased ARPC5 expression but not β-ACTIN, β-TUBULIN, and PAXILLIN expression. Arpc5 overexpression inhibited GC proliferation, differentiation, and progesterone synthesis. Furthermore, the expression of progesterone synthesis-associated enzymes was downregulated in the Arpc5 overexpression group, and the GC cytoskeleton exhibited evident changes. We conclude that Arpc5, a new target of miR-145, regulates primary GC proliferation and progesterone production by regulating the cytoskeleton remodeling.