Stem cell secretome treatment improves whole‐body metabolism, reduces adiposity, and promotes skeletal muscle function in aged mice

Aging coincides with the progressive loss of muscle mass and strength, increased adiposity, and diminished physical function. Accordingly, interventions aimed at improving muscle, metabolic, and/or physical health are of interest to mitigate the adverse effects of aging. In this study, we tested a s...

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Veröffentlicht in:Aging cell 2024-06, Vol.23 (6), p.e14144-n/a
Hauptverfasser: Fennel, Zachary J., Bourrant, Paul‐Emile, Kurian, Anu Susan, Petrocelli, Jonathan J., Hart, Naomi M. M. P., Yee, Elena M., Boudina, Sihem, Keirstead, Hans S., Nistor, Gabrielle, Greilach, Scott A., Berchtold, Nicole C., Lane, Thomas E., Drummond, Micah J.
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container_issue 6
container_start_page e14144
container_title Aging cell
container_volume 23
creator Fennel, Zachary J.
Bourrant, Paul‐Emile
Kurian, Anu Susan
Petrocelli, Jonathan J.
Hart, Naomi M. M. P.
Yee, Elena M.
Boudina, Sihem
Keirstead, Hans S.
Nistor, Gabrielle
Greilach, Scott A.
Berchtold, Nicole C.
Lane, Thomas E.
Drummond, Micah J.
description Aging coincides with the progressive loss of muscle mass and strength, increased adiposity, and diminished physical function. Accordingly, interventions aimed at improving muscle, metabolic, and/or physical health are of interest to mitigate the adverse effects of aging. In this study, we tested a stem cell secretome product, which contains extracellular vesicles and growth, cytoskeletal remodeling, and immunomodulatory factors. We examined the effects of 4 weeks of 2×/week unilateral intramuscular secretome injections (quadriceps) in ambulatory aged male C57BL/6 mice (22–24 months) compared to saline‐injected aged‐matched controls. Secretome delivery substantially increased whole‐body lean mass and decreased fat mass, corresponding to higher myofiber cross‐sectional area and smaller adipocyte size, respectively. Secretome‐treated mice also had greater whole‐body physical function (grip strength and rotarod performance) and had higher energy expenditure and physical activity levels compared to control mice. Furthermore, secretome‐treated mice had greater skeletal muscle Pax7+ cell abundance, capillary density, collagen IV turnover, reduced intramuscular lipids, and greater Akt and hormone sensitive lipase phosphorylation in adipose tissue. Finally, secretome treatment in vitro directly enhanced muscle cell growth and IL‐6 production, and in adipocytes, it reduced lipid content and improved insulin sensitivity. Moreover, indirect treatment with secretome‐treated myotube culture media also enhanced muscle cell growth and adipocyte size reduction. Together, these data suggest that intramuscular treatment with a stem cell secretome improves whole‐body metabolism, physical function, and remodels skeletal muscle and adipose tissue in aged mice. In this study, we show that the 4‐week administration of a stem cell secretome, made up of exosomes, growth, immune, and extracellular matrix factors, robustly ameliorated several hallmarks of aging in male mice resulting in improvements in physical function, metabolism, adiposity, and skeletal muscle remodeling.
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M. P. ; Yee, Elena M. ; Boudina, Sihem ; Keirstead, Hans S. ; Nistor, Gabrielle ; Greilach, Scott A. ; Berchtold, Nicole C. ; Lane, Thomas E. ; Drummond, Micah J.</creator><creatorcontrib>Fennel, Zachary J. ; Bourrant, Paul‐Emile ; Kurian, Anu Susan ; Petrocelli, Jonathan J. ; Hart, Naomi M. M. P. ; Yee, Elena M. ; Boudina, Sihem ; Keirstead, Hans S. ; Nistor, Gabrielle ; Greilach, Scott A. ; Berchtold, Nicole C. ; Lane, Thomas E. ; Drummond, Micah J.</creatorcontrib><description>Aging coincides with the progressive loss of muscle mass and strength, increased adiposity, and diminished physical function. Accordingly, interventions aimed at improving muscle, metabolic, and/or physical health are of interest to mitigate the adverse effects of aging. In this study, we tested a stem cell secretome product, which contains extracellular vesicles and growth, cytoskeletal remodeling, and immunomodulatory factors. We examined the effects of 4 weeks of 2×/week unilateral intramuscular secretome injections (quadriceps) in ambulatory aged male C57BL/6 mice (22–24 months) compared to saline‐injected aged‐matched controls. Secretome delivery substantially increased whole‐body lean mass and decreased fat mass, corresponding to higher myofiber cross‐sectional area and smaller adipocyte size, respectively. Secretome‐treated mice also had greater whole‐body physical function (grip strength and rotarod performance) and had higher energy expenditure and physical activity levels compared to control mice. Furthermore, secretome‐treated mice had greater skeletal muscle Pax7+ cell abundance, capillary density, collagen IV turnover, reduced intramuscular lipids, and greater Akt and hormone sensitive lipase phosphorylation in adipose tissue. Finally, secretome treatment in vitro directly enhanced muscle cell growth and IL‐6 production, and in adipocytes, it reduced lipid content and improved insulin sensitivity. Moreover, indirect treatment with secretome‐treated myotube culture media also enhanced muscle cell growth and adipocyte size reduction. Together, these data suggest that intramuscular treatment with a stem cell secretome improves whole‐body metabolism, physical function, and remodels skeletal muscle and adipose tissue in aged mice. 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In this study, we tested a stem cell secretome product, which contains extracellular vesicles and growth, cytoskeletal remodeling, and immunomodulatory factors. We examined the effects of 4 weeks of 2×/week unilateral intramuscular secretome injections (quadriceps) in ambulatory aged male C57BL/6 mice (22–24 months) compared to saline‐injected aged‐matched controls. Secretome delivery substantially increased whole‐body lean mass and decreased fat mass, corresponding to higher myofiber cross‐sectional area and smaller adipocyte size, respectively. Secretome‐treated mice also had greater whole‐body physical function (grip strength and rotarod performance) and had higher energy expenditure and physical activity levels compared to control mice. Furthermore, secretome‐treated mice had greater skeletal muscle Pax7+ cell abundance, capillary density, collagen IV turnover, reduced intramuscular lipids, and greater Akt and hormone sensitive lipase phosphorylation in adipose tissue. Finally, secretome treatment in vitro directly enhanced muscle cell growth and IL‐6 production, and in adipocytes, it reduced lipid content and improved insulin sensitivity. Moreover, indirect treatment with secretome‐treated myotube culture media also enhanced muscle cell growth and adipocyte size reduction. Together, these data suggest that intramuscular treatment with a stem cell secretome improves whole‐body metabolism, physical function, and remodels skeletal muscle and adipose tissue in aged mice. 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subjects Adipocytes
adipogenesis
Adipose tissue
Adiposity - drug effects
Aging
AKT protein
Animals
Body fat
Cell culture
Cell growth
Cell size
Collagen (type IV)
Culture media
Cytoskeleton
Energy expenditure
fibrosis
Immunomodulation
Kinases
Lipids
Male
metabolic rate
Mice
Mice, Inbred C57BL
MicroRNAs
Muscle, Skeletal - drug effects
Muscle, Skeletal - metabolism
Myotubes
NMR
Nuclear magnetic resonance
Phosphorylation
Physical activity
Quadriceps muscle
sarcopenia
Secretome
Secretome - metabolism
Skeletal muscle
Stem cells
Stem Cells - metabolism
Vascular endothelial growth factor
title Stem cell secretome treatment improves whole‐body metabolism, reduces adiposity, and promotes skeletal muscle function in aged mice
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