Related Articles Mature IGF-I excels in promoting functional muscle recovery from disuse atrophy compared to pro-IGF-IA.
J Appl Physiol (1985). 2013 Dec 26;
Authors: Park S, Brisson BK, Liu M, Spinazzola JM, Barton ER
Abstract
Prolonged disuse of skeletal muscle results in atrophy, and once physical activity is resumed, there is increased susceptibility to injury. Insulin-like growth factor-I (IGF-I) is considered a potential therapeutic target to attenuate atrophy during unloading and enhance rehabilitation upon reloading of skeletal muscles, due to its multi-pronged actions on satellite cell proliferation, differentiation and survival, as well as its actions on muscle fibers to boost protein synthesis and inhibit protein degradation. However, the form of IGF-I delivered may alter the success of treatment. Using the hindlimb suspension model of disuse atrophy, we compared the efficacy of two IGF-I forms in protection against atrophy and enhancement of recovery: mature IGF-I (IGF-IS) lacking the C-terminal extension, called the E-peptide, and IGF-IA which is the predominant form retaining the E-peptide. Self-complementary adeno-associated virus (AAV) harboring the murine Igf1 cDNA constructs were delivered to hindlimbs of adult female C57BL6 mice 3 days prior to hindlimb suspension. Hindlimb muscles were unloaded for 7 days and then reloaded for 3, 7, and 14 days. Loss of muscle mass following suspension was not prevented by either IGF-I construct. However, IGF-IS expression maintained soleus muscle force production. Further, IGF-IS treatment caused rapid recovery of muscle fiber morphology during reloading and maintained muscle strength. Analysis of gene expression revealed that IGF-IS expression accelerated the down-regulation of atrophy-related genes compared to untreated or IGF-IA treated samples. We conclude that mature-IGF-I may be a better option than pro-IGF-IA to promote skeletal muscle recovery following disuse atrophy.
PMID: 24371018 [PubMed - as supplied by publisher]
More...
Insulin like growth factors
IGF-1
Igf-1r3
This has been a World Class Bodybuilding automated thread
J Appl Physiol (1985). 2013 Dec 26;
Authors: Park S, Brisson BK, Liu M, Spinazzola JM, Barton ER
Abstract
Prolonged disuse of skeletal muscle results in atrophy, and once physical activity is resumed, there is increased susceptibility to injury. Insulin-like growth factor-I (IGF-I) is considered a potential therapeutic target to attenuate atrophy during unloading and enhance rehabilitation upon reloading of skeletal muscles, due to its multi-pronged actions on satellite cell proliferation, differentiation and survival, as well as its actions on muscle fibers to boost protein synthesis and inhibit protein degradation. However, the form of IGF-I delivered may alter the success of treatment. Using the hindlimb suspension model of disuse atrophy, we compared the efficacy of two IGF-I forms in protection against atrophy and enhancement of recovery: mature IGF-I (IGF-IS) lacking the C-terminal extension, called the E-peptide, and IGF-IA which is the predominant form retaining the E-peptide. Self-complementary adeno-associated virus (AAV) harboring the murine Igf1 cDNA constructs were delivered to hindlimbs of adult female C57BL6 mice 3 days prior to hindlimb suspension. Hindlimb muscles were unloaded for 7 days and then reloaded for 3, 7, and 14 days. Loss of muscle mass following suspension was not prevented by either IGF-I construct. However, IGF-IS expression maintained soleus muscle force production. Further, IGF-IS treatment caused rapid recovery of muscle fiber morphology during reloading and maintained muscle strength. Analysis of gene expression revealed that IGF-IS expression accelerated the down-regulation of atrophy-related genes compared to untreated or IGF-IA treated samples. We conclude that mature-IGF-I may be a better option than pro-IGF-IA to promote skeletal muscle recovery following disuse atrophy.
PMID: 24371018 [PubMed - as supplied by publisher]
More...
Insulin like growth factors
IGF-1
Igf-1r3
This has been a World Class Bodybuilding automated thread
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