microRNA-501 controls myogenin+/CD74+ myogenic progenitor cells during muscle regeneration

The role of non-coding RNAs in muscle aging: regulatory mechanisms and therapeutic potential

Muscle aging is a complex physiological process that leads to the progressive decline in muscle mass and function, contributing to debilitating conditions in the elderly such as sarcopenia. In recent years, non-coding RNAs (ncRNAs) have been increasingly recognized as major regulators of muscle aging and related cellular processes. Here, we comprehensively review the emerging role of ncRNAs, including microRNAs (miRNAs), long non-coding RNAs (lncRNAs), and circular RNAs (circRNAs), in the regulation of muscle aging. We also discuss how targeting these ncRNAs can be explored for the development of novel interventions to combat age-related muscle decline. The insights provided in this review offer a promising avenue for future research and therapeutic strategies aimed at improving muscle health during aging.

MicroRNA, miR-501 regulate the V(D)J recombination in B cells

The stringent regulation of RAGs (Recombination activating genes), the site-specific endonuclease responsible for V(D)J recombination, is important to prevent genomic rearrangements and chromosomal translocations in lymphoid cells. In the present study, we identify a microRNA, miR-501, which can regulate the expression of RAG1 in lymphoid cells. Overexpression of the pre-miRNA construct led to the generation of mature miRNAs and a concomitant reduction in RAG1 expression, whereas inhibition using anti-miRs resulted in its enhanced expression. The direct interaction of the 3'UTR of miR-501 with RAG1 was confirmed by the reporter assay. Importantly, overexpression of miRNAs led to inhibition of V(D)J recombination in B cells, revealing their impact on the physiological function of RAGs. Of interest is the inverse correlation observed for miR-501 with RAG1 in various leukemia patients and lymphoid cell lines, suggesting its possible use in cancer therapy. Thus, our results reveal the regulation of RAG1 by miR-501-3p in B cells and thus V(D)J recombination and its possible implications on immunoglobulin leukemogenesis.