E-ISSN 2146-8362
 

Original Research 


Fine Architectonics and Protein Turnover Rate in Myofibrils of Glucocorticoid-Caused Myopathic Rats

Priit Kaasik, Maria Umnova, Karin Alev, Anne Selart, Teet Seene.

Cited by (3)

Abstract
Objective: The purpose of this study was to assess the relationship between the synthesis and degradation rate of thick and thin myofilaments, and changes in fine architectonics of myofibrils of glycolytic muscle fibers of glucocorticoid caused myopathic rats. Methods: Male Wistar rats receive dexamethasone to induce myopathy. Protein synthesis rate degradation and structure of myofibrils was measured. Results: Myofibrils from glycolytic muscle fibers of 16-week-old male rats of the Wistar Strain were used for analysis. Myofibrils of glucocorticoid caused myopathic rats were thinner than in the control group (1.10 0.05 m2 and 2.56 0.08 m2, respectively) and thick and thin myofilaments in myopathic muscle disappeared from 22.0 2.7% of the myofibrils cross-section area. In the control group, myofilaments were absent from 1.8 0.5%. In the myopathic group, a positive correlation was found between the area of myofibrils where myofilaments disappeared and the myofibrillar protein degradation rate (r=0.849; p<0.001). A positive correlation was found between myofibrils cross-sectional area and thick myofilaments synthesis rate (r=0.933; p<0.001). Conclusions: Increased myofibrillar protein degradation rate, decreased myosin heavy chain (MyHC) and actin synthesis rate and a decrease in MyHC IIb isoform relative content in myopathic glycolytic muscle are related to qualitative remodeling of the myofibrillar apparatus in myopathic glycolytic muscle fibers.

Key words: Glucocorticoid myopathy, glycolytic fiber, myofibril architectonics, protein turnover rate


 
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How to Cite this Article
Pubmed Style

Priit Kaasik, Maria Umnova, Karin Alev, Anne Selart, Teet Seene. Fine Architectonics and Protein Turnover Rate in Myofibrils of Glucocorticoid-Caused Myopathic Rats. J Interdiscip Histopathol. 2012; 1(1): 5-10. doi:10.5455/jihp.20120606081246


Web Style

Priit Kaasik, Maria Umnova, Karin Alev, Anne Selart, Teet Seene. Fine Architectonics and Protein Turnover Rate in Myofibrils of Glucocorticoid-Caused Myopathic Rats. http://www.ejmjih.com/?mno=19363 [Access: December 12, 2018]. doi:10.5455/jihp.20120606081246


AMA (American Medical Association) Style

Priit Kaasik, Maria Umnova, Karin Alev, Anne Selart, Teet Seene. Fine Architectonics and Protein Turnover Rate in Myofibrils of Glucocorticoid-Caused Myopathic Rats. J Interdiscip Histopathol. 2012; 1(1): 5-10. doi:10.5455/jihp.20120606081246



Vancouver/ICMJE Style

Priit Kaasik, Maria Umnova, Karin Alev, Anne Selart, Teet Seene. Fine Architectonics and Protein Turnover Rate in Myofibrils of Glucocorticoid-Caused Myopathic Rats. J Interdiscip Histopathol. (2012), [cited December 12, 2018]; 1(1): 5-10. doi:10.5455/jihp.20120606081246



Harvard Style

Priit Kaasik, Maria Umnova, Karin Alev, Anne Selart, Teet Seene (2012) Fine Architectonics and Protein Turnover Rate in Myofibrils of Glucocorticoid-Caused Myopathic Rats. J Interdiscip Histopathol, 1 (1), 5-10. doi:10.5455/jihp.20120606081246



Turabian Style

Priit Kaasik, Maria Umnova, Karin Alev, Anne Selart, Teet Seene. 2012. Fine Architectonics and Protein Turnover Rate in Myofibrils of Glucocorticoid-Caused Myopathic Rats. Journal of Interdisciplinary Histopathology, 1 (1), 5-10. doi:10.5455/jihp.20120606081246



Chicago Style

Priit Kaasik, Maria Umnova, Karin Alev, Anne Selart, Teet Seene. "Fine Architectonics and Protein Turnover Rate in Myofibrils of Glucocorticoid-Caused Myopathic Rats." Journal of Interdisciplinary Histopathology 1 (2012), 5-10. doi:10.5455/jihp.20120606081246



MLA (The Modern Language Association) Style

Priit Kaasik, Maria Umnova, Karin Alev, Anne Selart, Teet Seene. "Fine Architectonics and Protein Turnover Rate in Myofibrils of Glucocorticoid-Caused Myopathic Rats." Journal of Interdisciplinary Histopathology 1.1 (2012), 5-10. Print. doi:10.5455/jihp.20120606081246



APA (American Psychological Association) Style

Priit Kaasik, Maria Umnova, Karin Alev, Anne Selart, Teet Seene (2012) Fine Architectonics and Protein Turnover Rate in Myofibrils of Glucocorticoid-Caused Myopathic Rats. Journal of Interdisciplinary Histopathology, 1 (1), 5-10. doi:10.5455/jihp.20120606081246





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