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The article focuses on the growing concerns about the integrity of scientific research worldwide, particularly regarding the handling of errors and retractions in published papers. Retraction Watch provides a valuable service by promptly highlighting challenges to recent publications, covering topics such as self-plagiarism, data manipulation, and mismanaged research studies.

Mechanical perturbation triggers activation of resident myogenic stem cells to enter the cell cycle through a cascade of events including hepatocyte growth factor (HGF) release from its extracellular tethering and the subsequent presentation to signaling‐receptor c‐met. Here, we show that with aging, extracellular HGF undergoes tyrosine‐residue (Y) nitration and loses c‐met binding, thereby disturbing muscle homeostasis. Biochemical studies demonstrated that nitration/dysfunction is specific to HGF among other major growth factors and is characterized by its locations at Y198 and Y250 in c‐met‐binding domains. Direct‐immunofluorescence microscopy of lower hind limb muscles from three age groups of rat, provided direct in vivo evidence for age‐related increases in nitration of ECM‐bound HGF, preferentially stained for anti‐nitrated Y198 and Y250‐HGF mAbs (raised in‐house) in fast IIa and IIx myofibers. Overall, findings highlight inhibitory impacts of HGF nitration on myogenic stem cell dynamics, pioneering a cogent discussion for better understanding age‐related muscle atrophy and impaired regeneration with fibrosis (including sarcopenia and frailty). [ABSTRACT FROM AUTHOR]

This document is the cover legend for an article titled "Age-related nitration/dysfunction of myogenic stem cell activator HGF" published in the journal Aging Cell. The article, authored by Alaa Elgaabari et al., explores the impact of aging on the function of a protein called HGF, which is involved in the activation of stem cells responsible for muscle regeneration. The research suggests that age-related nitration of HGF may contribute to the decline in muscle regeneration observed in older individuals. The article includes a list of all the authors involved in the study. [Extracted from the article]