β-Hydroxy-β-methylbutyrate reduces myonuclear apoptosis during recovery from hind limb suspension-induced muscle fiber atrophy in aged rats

Yanlei Hao, Janna R. Jackson, Yan Wang, Neile Edens, Suzette L. Pereira, Stephen Alway

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

βHydroxy-β-methylbutyrate (HMB) is a leucine metabolite shown to reduce protein catabolism in disease states and promote skeletal muscle hypertrophy in response to loading exercise. In this study, we evaluated the efficacy of HMB to reduce muscle wasting and promote muscle recovery following disuse in aged animals. Fisher 344×Brown Norway rats, 34 mo of age, were randomly assigned to receive either Ca-HMB (340 mg/kg body wt) or the water vehicle by gavage (n = 32/group). The animals received either 14 days of hindlimb suspension (HS, n = 8/diet group) or 14 days of unloading followed by 14 days of reloading (R; n = 8/diet group). Nonsuspended control animals were compared with suspended animals after 14 days of HS (n = 8) or after R (n = 8). HMB treatment prevented the decline in maximal in vivo isometric force output after 2 wk of recovery from hindlimb unloading. The HMB-treated animals had significantly greater plantaris and soleus fiber cross-sectional area compared with the vehicle-treated animals. HMB decreased the amount of TUNEL-positive nuclei in reloaded plantaris muscles (5.1% vs. 1.6%, P<0.05) and soleus muscles (3.9% vs. 1.8%, P<0.05). Although HMB did not significantly alter Bcl-2 protein abundance compared with vehicle treatment, HMB decreased Bax protein abundance following R, by 40% and 14% (P<0.05) in plantaris and soleus muscles, respectively. Cleaved caspase-3 was reduced by 12% and 9% (P<0.05) in HMB-treated reloaded plantaris and soleus muscles, compared with vehicle-treated animals. HMB reduced cleaved caspase-9 by 14% and 30% (P<0.05) in reloaded plantaris and soleus muscles, respectively, compared with vehicle-treated animals. Although, HMB was unable to prevent unloading-induced atrophy, it attenuated the decrease in fiber area in fast and slow muscles after HS and R. HMB's ability to protect against muscle loss may be due in part to putative inhibition of myonuclear apoptosis via regulation of mitochondrial-associated caspase signaling.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume301
Issue number3
DOIs
StatePublished - Sep 1 2011
Externally publishedYes

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Muscular Atrophy
Suspensions
Skeletal Muscle
Extremities
Apoptosis
Hindlimb Suspension
Muscles
Caspase 14
Diet
bcl-2-Associated X Protein
Caspase 9
In Situ Nick-End Labeling
Caspases
Leucine
Caspase 3
Hypertrophy
Atrophy
Proteins
Water

All Science Journal Classification (ASJC) codes

  • Physiology
  • Physiology (medical)

Cite this

β-Hydroxy-β-methylbutyrate reduces myonuclear apoptosis during recovery from hind limb suspension-induced muscle fiber atrophy in aged rats. / Hao, Yanlei; Jackson, Janna R.; Wang, Yan; Edens, Neile; Pereira, Suzette L.; Alway, Stephen.

In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology, Vol. 301, No. 3, 01.09.2011.

Research output: Contribution to journalArticle

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