Bta-miR-24-3p Controls the Myogenic Differentiation and Proliferation of Fetal, Bovine, Skeletal Muscle-Derived Progenitor Cells by Targeting ACVR1B.

Xin Hu,Yahui Wang,Lupei Zhang,Lingyang Xu,Xing Fu,Qian Li,Ling Ren,Junya Li,Luc Willems,Qiyuan Yang,Yishen Xing

doi:10.3390/ani9110859

Abstract

Simple SummaryMicroRNAs play pivotal roles in skeletal muscle development, but the molecular basis of their functions in fetal bovine skeletal muscle development is largely unknown. Here, we report a mechanistic study of bta-miR-24-3p, a key miRNA regulator of the myogenic differentiation of fetal bovine platelet-derived growth factor receptor alpha negative (PDGFRα-) progenitor cells. We isolated progenitor cells from the bovine fetal longissimus dorsi muscle and purified them with PDGFRα antibodies to remove fibro-adipogenic progenitors. We observed elevated bta-miR-24-3p expression during differentiation, and bta-miR-24-3p overexpression led to promoted myogenic differentiation but suppressed proliferation. Moreover, activin receptor type 1B (ACVR1B) was identified as a direct target of bta-miR-24-3p, and ACVR1B-silencing cells exhibited similar phenotypes to bta-miR-24-3p-overexpressing bovine PDGFRα- progenitor cells. These results extended our understanding on the roles of miRNA in fetal muscle development. The method of removing fibro-adipogenic progenitors in our study will also provide useful information for other investigators.MicroRNAs modulate a variety of cellular events, including skeletal muscle development, but the molecular basis of their functions in fetal bovine skeletal muscle development is poorly understood. In this study, we report that bta-miR-24-3p promotes the myogenic differentiation of fetal bovine PDGFRα- progenitor cells. The expression of bta-miR-24-3p increased during myogenic differentiation. Overexpression of bta-miR-24-3p significantly promoted myogenic differentiation, but inhibited proliferation. A dual-luciferase assay identified ACVR1B as a direct target of bta-miR-24-3p. Similarly, knocking down ACVR1B by RNA interference also significantly inhibited proliferation and promoted the differentiation of bovine PDGFRα- progenitor cells. Thus, our study provides a mechanism in which bta-miR-24-3p regulates myogenesis by inhibiting ACVR1B expression.

Highlights

The fetal stage is crucial for skeletal muscle development, because the majority of skeletal muscle fibers form during this stage [1]
Our results demonstrate that bta-miR-24-3p inhibits bovine PDGFRα- progenitor cell proliferation and improves their differentiation by targeting ACVR1B
To investigate the expression of bta-miR-24-3p during myogenesis, PDGFRα- progenitor cells were isolated from the longissimus dorsi tissue of bovine fetus, according to a previous study [21], and myogenic differentiation was induced in vitro

Summary

Introduction

The fetal stage is crucial for skeletal muscle development, because the majority of skeletal muscle fibers form during this stage [1]. Bta-miR-378 could promote bovine skeletal muscle-derived satellite cell (bMDSC) differentiation by suppressing DNA polymerase alpha 2 (POLA2) expression [12]. MiR-143 regulates bovine muscle satellite cell (MSCs) differentiation and proliferation by directly targeting insulin like growth factor binding protein 5 (IGFBP5) [10]. MiR-148-3p could inhibit the proliferation and enhance the apoptosis of bovine muscle cells by targeting Kruppel like factor 6 (KLF6) [11]. These findings point to a role of miRNAs in bovine skeletal muscle development

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