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Zinc deficiency contributes to blunted myogenesis in chronic kidney disease

ABSTRACT: Frailty in patients with chronic kidney disease (CKD) greatly exacerbates disease comorbidities and increases probability of death. Prior research underscores molecular alterations in skeletal muscle physiology that may underly frailty and poor intervention response in this patient population. CKD can negatively affect satellite cell abundance and function, reducing skeletal muscle injury resilience and adaptive capacity. Pathogenic drivers of compromised satellite cell abundance and activity in patients with CKD remain largely unknown. To address this gap in knowledge, we isolated primary myogenic progenitor cells (MPCs) from patients with CKD and control participants. We also sought to define cell-extrinsic and intrinsic processes that may underlie myogenic deficits. We performed RNA sequencing on MPCs from control participants cultured in control serum, MPCs from control participants cultured in CKD serum, and MPCs from CKD participants cultured in control serum. We identified zinc mishandling as a shared pathway between control cells treated with CKD serum and CKD cells treated with control serum. Consistent with these observations, we found zinc deficiency and attenuated myogenesis in MPCs from patients with CKD. Finally, we showed that zinc supplementation partially restores the myogenic capacity of MPCs from patients with CKD. Together, these data highlight the importance of zinc metabolism in myogenesis and identify a novel mechanism whereby CKD pathogenesis impedes MPC differentiation.

ORGANISM(S): Homo sapiens

PROVIDER: GSE310640 | GEO | 2026/01/28

REPOSITORIES: GEO

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	GSE310640_gene_count.xls.gz	Xls

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Project description:Context: Although androgen treatment increases muscle mass in HIV-infected men, the underlying mechanisms are poorly understood. Analysis of genome-wide microarray data obtained from skeletal muscle biopsies can be used to profile androgen-regulated pathways. Objective: To identify genes and pathways associated with testosterone treatment and myogenesis in the context of HIV-infected men using genome-wide microarray analysis of skeletal muscle biopsies. Results: A significant weight gain was observed in subjects treated with testosterone compared to placebo (+2.05 kgs and â??1.07 kgs, respectively; P = 0.003) as well as gains in DEXA lean; mass (2.93 kgs vs. 0.35 kgs, respectively; P = 0.003). Microarray expression profiles and RTPCR validation of RNA after 14 days of treatment indicated that several gene sets including; transcriptional control, myogenesis, adipogenesis, insulin signaling, apoptosis, cell cycle, chromatin remodeling, and stress response genes were differentially expressed with testosterone treatment. Protein expression analysis of myogenic differentiation and protein synthesis markers (MyoD, Myogenin, phosphorylated p38 MAPK and phosphorylated AKT) in muscle biopsies and skeletal muscle cells treated with DHT confirmed that testosterone engages; a network of pro-myogenic genes. Conclusions: Testosterone-associated gain in muscle mass in HIV-infected men engaged a network of regulatory pathways involved in broad transcriptional control, myogenesis, insulin signaling, chromatin remodeling, and stress response. Further evaluation of precise signaling intermediates within androgen regulated pathways may help to better define improvements in muscle mass, both in healthy and HIV infected patients. Experiment Overall Design: Design, Setting, and Participants: 44 HIV+ men with weight loss were randomized to receive either 300mg testosterone enanthate or placebo injections IM weekly for 16 weeks. Muscle Experiment Overall Design: biopsies were obtained at baseline and on treatment day 14. A random subset of specimens was chosen for microarray analysis; changes in selected genes were confirmed by reverse transcriptase - polymerase chain reaction (RT-PCR), and western blot analysis. Human skeletal Experiment Overall Design: myogenic precursor cells (SkMCs) were cultured in vitro in the presence of dihydrotestosterone (DHT) to evaluate activation of myogenic protein expression. Experiment Overall Design: Main outcome measures: Relative RNA levels in skeletal muscle biopsies were measured by expression profiling with microarrays and expression levels were validated in samples using quantitative RT-PCR. Further confirmation of changes in key myogenic biomarkers was obtained in DHT treated SkMCs.

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Zinc deficiency contributes to blunted myogenesis in chronic kidney disease

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