The effect of miR-205a with RUNX2 towards proliferation and differentiation of chicken chondrocytes in thiram-induced tibial dyschondroplasia.

Tibial dyschondroplasia (TD) is a kind of metabolic bone disease in fast-growing broilers, which seriously restricts the development of poultry industry. Our previous studies have revealed a significant upregulation of miR-205a in TD cartilage tissue, suggesting its potential role as a regulatory factor in the pathogenesis of TD. However, the precise function implications and underlying regulatory mechanism remain elusive. Therefore, this study aims to elucidate the biological functions and regulatory mechanisms of miR-205a in the progression of TD by employing mehtodologies such as qRT-PCR, CCK-8 assay, EdU assays, and flow cytometry. The findings demonstrated that the transfection of miR-205a overexpression plasmid reduced chondrocytes growth and development in TD while enhancing apoptosis; conversely, blocking miR-205a had opposite effects. RUNX2 was identified as a target gene of miR-205a through biosynthesis and dual luciferase assays, and its overexpression helps chondrocytes in TD grow and develop. However, when both miR-205a and RUNX2 were overexpressed, the regulatory effect of RUNX2 was significantly suppressed. In conclusion, miR-205a plays a role in slowing the growth and development of chondrocytes in TD by targeting and reducing RUNX2 expression, which helps to initiate and progress TD.