Abstract:
:Skeletal muscle, the main protein reservoir in the body, is a tissue that exhibits high plasticity when exposed to changes. Muscle proteins can be mobilized into free amino acids when skeletal muscle wasting occurs, a process called skeletal muscle atrophy. This wasting is an important systemic or local manifestation under disuse conditions (e.g., bed rest or immobilization), in starvation, in older adults, and in several diseases. The molecular mechanisms involved in muscle wasting imply the activation of specific signaling pathways which ultimately manage muscle responses to modulate biological events such as increases in protein catabolism, oxidative stress, and cell death by apoptosis. Many factors have been involved in the generation and maintenance of atrophy in skeletal muscle, among them angiotensin II (Ang-II), the main peptide of renin-angiotensin system (RAS). Together with Ang-II, the angiotensin-converting enzyme (ACE) and the Ang-II receptor type 1 (AT-1 receptor) are expressed in skeletal muscle, forming an important local axis that can regulate its function. In many of the conditions that lead to muscle wasting, there is an impairment of RAS in a global or local fashion. At this point, there are several pieces of evidence that suggest the participation of Ang-II, ACE, and AT-1 receptor in the generation of skeletal muscle atrophy. Interestingly, the Ang-II participation in muscle atrophy is strongly ligated to the regulation of hypertrophic activity of factors such as insulin-like growth factor 1 (IGF-1). In this article, we reviewed the current state of Ang-II and RAS function on skeletal muscle wasting and its possible use as a therapeutic target to improve skeletal muscle function under atrophic conditions.
journal_name
Curr Protein Pept Scijournal_title
Current protein & peptide scienceauthors
Cabello-Verrugio C,Córdova G,Salas JDdoi
10.2174/138920312803582933subject
Has Abstractpub_date
2012-09-01 00:00:00pages
560-9issue
6eissn
1389-2037issn
1875-5550pii
CPPS-EPUB-20120910-1journal_volume
13pub_type
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