Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (5): 1247-1257.doi: 10.11843/j.issn.0366-6964.2021.05.011

• ANIMAL GENETICS AND BREEDING • Previous Articles     Next Articles

Regulation of miR-186-5p on Proliferation and Differentiation of Porcine Primary Preadipocytes

CAI Chunbo, LIU Min, YANG Yang, ZHANG Wanfeng, GAO Pengfei, CAO Guoqing, LI Bugao, GUO Xiaohong*   

  1. College of Animal Science, Shanxi Agricultural University, Taigu 030801, China
  • Received:2020-08-05 Online:2021-05-23 Published:2021-05-22

Abstract: The study aimed to explore the regulation and mechanism of miR-186-5p on the proliferation and adipogenic differentiation of porcine primary preadipocytes. The neck subcutaneous fat of 7-day-old healthy Mashen boar was collected and the primary preadipocytes were isolated and cultured. The primary preadipocytes were divided into 4 groups, which were transfected with miR-186-5p mimics (mimics) and its control group (mimics NC), miR-186-5p inhibitor (inhibitor) and its control group (inhibitor NC). CCK8 and scratch test were used to analyze the proliferation effect of porcine primary preadipocytes. Oil red O staining was used to detect the adipogenic differentiation ability. qPCR was used to detect the expression of proliferation and adipogenic differentiation related genes. The target genes of miR-186-5p were predicted, and the interaction between miR-186-5p and target genes was detected by dual luciferase reporter assay. When mimics were transfected into porcine primary preadipocytes, the expression of miR-186-5p significantly increased(P<0.01); meanwhile the cell proliferation ability and expression of proliferation related genes, proliferating cell nuclear antigen (PCNA), cyclin-dependent kinases 4 (CDK4), and the target gene sirtuins 2 (SIRT2) significantly decreased(P<0.01); however, the adipogenic differentiation ability and expression of adipogenic differentiation related genes, peroxisome proliferators-activated receptor γ (PPARγ), sterol regulatory element binding transcription factor 1 (SREBF1), CCAAT enhancer binding protein β (C/EBPβ), fatty acid-binding protein 4 (FABP4) and lipoprotein lipase (LPL) significantly increased(P<0.01). When the primary preadipocytes were transfected with inhibitor, the expression of miR-186-5p significantly decreased(P<0.01); meanwhile the cell proliferation ability and expression of PCNA, CDK4 and SIRT2 significantly increased(P<0.05 or P<0.01); while the adipogenic differentiation ability and expression of PPARγ, SREBF1, C/EBPβ, FABP4 and LPL significantly decreased(P<0.01). Transfection of miR-186-5p mimics significantly inhibited the activity of luciferase in SIRT2-Wt-psiCHECK-2, but did not affect the activity of luciferase in SIRT2-Mut-psiCHECK-2. The results show that miR-186-5p can target the 3'UTR of SIRT2 and decrease the expression of SIRT2, which can inhibit the proliferation of Mashen pig primary preadipocytes and promote their adipogenic differentiation.

Key words: miR-186-5p, Mashen pigs, primary preadipocytes, proliferation, adipogenic differentiation, target gene

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