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Magnesium transport and homeostasis-related gene expression in skeletal muscle of young and old adults: analysis of the transcriptomic data from the PROOF cohort Study. | LitMetric

AI Article Synopsis

  • Magnesium (Mg) is crucial for many biological functions, with a significant portion found in skeletal muscle, and its transport and homeostasis are essential for overall body Mg regulation.
  • A study compared gene expression related to Mg transport in young (22 y) and older men (73 y), revealing minimal changes in gene levels with age, except for a slight decrease in one gene (Slc41a3) in older individuals.
  • The research highlighted a decline in correlations between Mg transport genes and various physiological and muscle traits in older men, suggesting a potential impairment in muscle Mg homeostasis and resilience in aging.

Article Abstract

Magnesium (Mg) is critical for a number of biological processes and 25% body Mg is located in the skeletal muscle. Mg transport and homeostasis systems (MgTHs) regulate intracellular Mg concentration and muscle MgTHs are thus related to whole body Mg homeostasis. Nonetheless, few studies have investigated the regulation of muscle MgTHs under (patho)physiological conditions. Herein, we assessed the relationship between the expression of MgTHs genes (Trpm6, Trpm7, Magt1, Mrs2, Cnnm1-4, Slc41a1-3) and relevant pathways in human sarcopenia, which is one of the most dramatic physiologic changes affecting the human body. Transcriptomic data were compared between young adult (YO, 22 y, n = 11) and old (EL, 73 y, n = 13) men from the PROOF cohort. MgTH mRNA levels did not change with aging, with the exception of a slight decrease for Slc41a3. Nevertheless, interindividual variations of mRNA levels revealed strong correlations between MgTHs in the YO group, while few were maintained in the EL muscle. Moreover, in the YO muscle, different clusters of MgTH mRNAs strongly correlated with divers physiological (BMI, blood pressure) and muscle characteristics (intramyocellular droplets, capillarization); however, most correlations changed or disappeared in the EL muscle. Further investigations of the whole transcriptome identified several sets of mRNAs correlated with defined MgTHs. There again was a sharp difference between YO and EL muscles, as the number of mRNAs correlated with MgTHs strongly decreased with aging. Gene ontology analyses of these sets of correlated mRNAs revealed 6 biological processes common to YO and EL, 3 specific to the YO (RNA processing, translation, respiration), and 2 (regulation of catabolic process, Wnt signaling) to the EL muscle. Overall, these observations lead to questions about potential resilience to muscle Mg homeostasis in the elderly.

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Source
http://dx.doi.org/10.1684/mrh.2019.0458DOI Listing

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