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Aging alters macrophage properties in human skeletal muscle both at rest and in response to acute resistance exercise.
- Source :
-
Experimental gerontology [Exp Gerontol] 2006 Mar; Vol. 41 (3), pp. 320-7. Date of Electronic Publication: 2006 Feb 02. - Publication Year :
- 2006
-
Abstract
- Macrophages are involved in skeletal muscle repair through pro-inflammatory and alternative functions. We tested the hypothesis that aging alters the abundance and properties of skeletal muscle macrophages that will influence their functional response to acute resistance exercise. Total macrophages (CD 68+), as well as pro- (CD 11b+) and anti-inflammatory (CD 163+) subpopulations and associated cytokine mRNAs were quantified in vastus lateralis biopsies from young (N=17) and elderly (N=17) males pre- and 72 h post-exercise. Pre-exercise, young muscle tended to possess a greater number of macrophages, whereas elderly muscle possessed higher levels of IL-1 beta (P=0.001), IL-1 RA (P=0.003), and IL-10 (P=0.028). Post-exercise, total macrophages did not change in either group, however, the number of CD 11b+ (P=0.039) and CD 163+ (P=0.026) cells increased 55 and 29%, respectively, but only in the young. IL-1 beta (P=0.006), IL-10 (P=0.016), and AMAC-1 (P=0.044) also increased, approximately two-fold, and again only in the young. Quantitation of CD 11b+ and CD 163+ cells suggests that the majority of resident macrophages possess alternative functions, and a small subpopulation participates in the inflammatory response. Both subpopulations increased their activity post-exercise, exclusively in the young. These findings suggest that aging results in a defective regulation of muscle macrophage function, both at baseline and in response to resistance exercise, that may limit muscle hypertrophy in older adults.
- Subjects :
- Adult
Aged
Antigens, CD immunology
Antigens, Differentiation, Myelomonocytic immunology
Biomarkers analysis
CD11b Antigen immunology
Cell Count
Chemokines, CC analysis
Humans
Immunohistochemistry methods
Interleukin-1 immunology
Interleukin-10 analysis
Interleukin-1beta analysis
Interleukin-6 analysis
Macrophage Activation immunology
Male
Muscle, Skeletal cytology
Muscle, Skeletal immunology
RNA, Messenger analysis
Receptor, Macrophage Colony-Stimulating Factor immunology
Receptors, Cell Surface immunology
Receptors, Interleukin-1 antagonists & inhibitors
Aging physiology
Exercise physiology
Macrophages immunology
Muscle, Skeletal physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0531-5565
- Volume :
- 41
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Experimental gerontology
- Publication Type :
- Academic Journal
- Accession number :
- 16457979
- Full Text :
- https://doi.org/10.1016/j.exger.2005.12.007