Notch4 affects the proliferation and differentiation of deer antler chondrocytes through the Smad3/lncRNA27785.1 axis

Long non-coding RNA play an importantr role in the differentiation of chondrocytes. This study aims to explore the role of long non-coding RNA in the transcriptional regulation of Notch4. In previous studies, it has been found that Notch signal can be used as the downstream of TGF-β signal to affect the proliferation and differentiation of deer antler chondrocytes, but the specific mechanism remains unclear. Here we found that lncRNA27785.1 was involved in the regulation of TGF-β/ Smad3 signal and Notch4 gene. The overexpression lncRNA27785.1 can negatively regulate the expression of Notch4 to inhibit cell proliferation and differentiation, while interference with lncRNA27785.1 can promote the expression of Notch4 gene to promote the proliferation and differentiation of chondrocytes. Subsequently, through luciferase experiment and CHIP experiment, we found that lncRNA27785.1 is regulated by Smad3 transcription, and Smad3 inhibited the expression of lncRNA27785.1. In addition, activated TGF-β signaling can reduce the inhibitory effect of lncRNA27785.1 on Notch4 signaling. In summary, we found that lncRNA27785.1 and TGF-β/Smad3 play an important role in Notch4 signaling. Our findings provided evidence to explain how TGF-β signaling regulate the Notch signaling pathway to influence chondrocyte proliferation and differentiation by a specific lncRNA27785.1.