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Age-related changes in human skeletal muscle transcriptome and proteome are more affected by chronic inflammation and physical inactivity than primary aging

ABSTRACT: Evaluation of the influence of primary and secondary aging on the manifestation of molecular and cellular hallmarks of aging is a challenging and currently unresolved issue. Our study represents the first demonstration of the distinct role of primary aging and both chronic inflammation and physical inactivity – the most important drivers of secondary aging, in the regulation of transcriptomic and proteomic profiles in human skeletal muscle. To achieve this purpose, young healthy people (n=15), young (n=8) and older (n=37) patients with knee/hip osteoarthritis, a model to study the effect of long-term inactivity and chronic inflammation on the vastus lateralis muscle, were included in the study. It was revealed that widespread and substantial age-related changes in gene expression (~4,000 genes regulating mitochondrial function, proteostasis, cell membrane, secretory and immune response) were related to the long-term physical inactivity and chronic inflammation rather than primary aging. Primary aging contributed mainly to the regulation of genes (~200) encoding nuclear proteins (regulators of DNA repair, RNA processing, and transcription), mitochondrial proteins (genes encoding respiratory enzymes, mitochondrial complex assembly factors, regulators of cristae formation and mitochondrial reactive oxygen species production), as well as regulators of proteostasis. It was found that proteins associated with aging were regulated mainly at the post-transcriptional level. The set of putative primary aging genes and their potential transcriptional regulators can be used as a resource for further targeted studies investigating the role of individual genes and related transcription factors in the emergence of a senescent cell phenotype.

ORGANISM(S): Homo sapiens

PROVIDER: GSE242202 | GEO | 2024/01/29

REPOSITORIES: GEO

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Project description:Age is the primary risk factor for many chronic diseases and cognitive decline during brain aging may increase dementia risk. Hallmarks of brain aging including neuronal dysfunction and glial contribute to reduced cognitive function, and there is a persistent lack of effective treatments. Bioactive plant compounds called “nutraceuticals” can target age-related cellular processes and may protect cognitive function. Apigenin is a flavone found in plants such as chamomile and can inhibit hallmarks of aging such as cellular senescence, mitochondrial dysfunction, and impaired proteostasis. However, the underlying mechanisms of apigenin in the brain are not fully understood. Here, we characterized brain transcriptome changes in young and old mice given apigenin in drinking water and examined potential mechanisms in human astrocytes. Consistent with previous studies, we observed improved novel object recognition in old mice treated with apigenin versus old controls. Transcriptome analyses in old controls found differentially expressed genes related to immune responses, inflammation, and cytokine regulation versus young. Fewer differences were observed in old apigenin-treated versus old controls, but these changes were related to development, behavior, and antiviral responses. The majority of upregulated genes in old mice were downregulated with apigenin treatment and associated with immune responses. Similarly, the genes that were reduced with aging, but increased in old apigenin-treated mice were related to pathways important for neurological function/disease, cellular maintenance, and homeostatic signaling. We also found that glial cells drove the majority of the transcriptome differences with aging and apigenin-treatment. To explore the mechanism of action for apigenin in glial cells, we treated replicatively aged astrocytes with apigenin and observed reduced markers of inflammation and cellular senescence. Collectively, our data support the role of apigenin as a protector of cognitive and neuronal function protectant through the suppression of neuroinflammatory genes and proteins and may be especially important in non-neuronal cells.

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Age-related changes in human skeletal muscle transcriptome and proteome are more affected by chronic inflammation and physical inactivity than primary aging

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