| Altered REDD1, myostatin and Akt/mTOR/FoxO/MAPK Signaling in Streptozotocin-induced Diabetic Muscle Atrophy. | |
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MedLine Citation:
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PMID: 22068602 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Type 1 diabetes, if poorly controlled, leads to skeletal muscle atrophy, decreasing the quality of life. We aimed to search highly responsive genes in diabetic muscle atrophy in a common diabetes model and to further characterize associated signaling pathways. Mice were sacrificed 1, 3 or 5 weeks after streptozotocin or control. Gene expression of calf muscles was analyzed using microarray, and protein signaling with western blotting. We identified translational repressor protein REDD1 (Regulated in Development and DNA Damage responses) that increased 7-8 fold and was associated with muscle atrophy in diabetes. The diabetes-induced increase in REDD1 was confirmed at the protein level. This result was accompanied with the increased gene expression of DNA damage/repair pathways and decreased expression in ATP production pathways. Concomitantly, increased phosphorylation of AMPK and dephosphorylation of Akt/mTOR/S6K1/FoxO pathway of proteins were observed together with increased protein ubiquitination. These changes were especially evident during the first 3 weeks, along with the strong decrease in muscle mass Diabetes also induced an increase in myostatin protein and decreased MAPK signaling. These, together with decreased serum insulin and increased serum glucose, remained altered throughout the 5 week period. In conclusion, diabetic myopathy induced by streptozotocin led to alteration of multiple signaling pathways. Of those, increased REDD1 and myostatin together with decreased Akt/mTOR/FoxO signaling are associated with diabetic muscle atrophy. The increased REDD1 and decreased Akt/mTOR/FoxO signaling followed a similar time-course and, thus, may be explained, in part, by increased expression of genes in DNA damage/repair and possibly also decrease in ATP-production pathways. |
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Authors:
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Juha J Hulmi; Mika Silvennoinen; Maarit Lehti; Riikka Kivelä; Heikki Kainulainen |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-11-8 |
Journal Detail:
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Title: American journal of physiology. Endocrinology and metabolism Volume: - ISSN: 1522-1555 ISO Abbreviation: - Publication Date: 2011 Nov |
Date Detail:
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Created Date: 2011-11-9 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100901226 Medline TA: Am J Physiol Endocrinol Metab Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1University of Jyväskylä |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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