Cited by 117Muscle Physiology and DisordersNutrition and Health in AgingImmune cells in cancer

Skewed macrophage polarization in aging skeletal muscle

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Cui, Chang‐Yi, Driscoll, Riley K., Piao, Yulan, Chia, Chee W., Gorospe, Myriam, Ferrucci, Luigi·2019·Aging Cell

Abstract

Skeletal muscle aging is a major cause of disability and frailty in the elderly. The progressive impairment of skeletal muscle function with aging was recently linked to a disequilibrium between damage and repair. Macrophages participate in muscle tissue repair, first as pro-inflammatory M1 subtype and then as anti-inflammatory M2 subtype. However, information on the presence of macrophages in skeletal muscle is still sporadic and the effect of aging on macrophage phenotype remains unknown. In this study, we sought to characterize the polarization status of macrophages in skeletal muscle of persons across a wide range of ages. We found that most macrophages in human skeletal muscle are M2, and that this number increased with advancing age. On the contrary, M1 macrophages declined with aging, making the total number of macrophages invariant with older age. Notably, M2 macrophages colocalized with increasing intermuscular adipose tissue (IMAT) in aging skeletal muscle. Similarly, aged BALB/c mice showed increased IMAT and M2 macrophages in skeletal muscle, accompanied by slightly increased collagen protein production. Collectively, we report that polarization of macrophages to the major M2 subtype is associated with IMAT and propose that increased M2 in aged skeletal muscle may impact upon muscle metabolism associated with aging.

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Authors
Cui, C., Driscoll, R. K., Piao, Y., Chia, C. W., Gorospe, M., & Ferrucci, L.
Affiliations
National Institutes of Health (US)
Corresponding author
Ferrucci, Luigi
Venue
Aging Cell
Publisher
Wiley
Published
2019-09-02
Volume
18
Issue
6
Pages
e13032-e13032
ISSN
  • 1474-9718 (ISSN-L)
  • 1474-9726
OpenAlex
W2972043015
Cited by
117
References
36
Citations by year
2026: 20 · 2025: 11 · 2024: 20 · 2023: 18 · 2022: 17 · 2021: 18 · 2020: 12 · 2019: 1
FWCI
3.97
Type
journal article
Language
en
Open access
Locations
  • Aging Cell (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Institute on Aging
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
Keywords
skeletal muscle aging, macrophage polarization, M2 macrophages, M1 macrophages, intermuscular adipose tissue, muscle repair, collagen deposition, muscle metabolism, frailty, human skeletal muscle
MeSH terms
Adult, Aged, Aged, 80 and over, Aging, Animals, Humans, Macrophage Activation, Macrophages, Mice, Inbred BALB C, Middle Aged, Cellular Senescence, Muscle, Skeletal, Mice, Healthy Volunteers

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