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Journal of Biomedicine and Biotechnology
Volume 2011 (2011), Article ID 393405, 7 pages
http://dx.doi.org/10.1155/2011/393405
Research Article

Transversal Stiffness and Beta-Actin and Alpha-Actinin-4 Content of the M. Soleus Fibers in the Conditions of a 3-Day Reloading after 14-Day Gravitational Unloading

State Scientific Center of Russian Federation-Institute of Biomedical Problems, Russian Academy of Sciences, 76-a, Khoroshevskoye shosse, Moscow 123 007, Russia

Received 2 April 2011; Revised 7 July 2011; Accepted 22 July 2011

Academic Editor: J.-P. Jin

Copyright © 2011 I. V. Ogneva. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of the work was to analyze the structural changes in different parts of the sarcolemma and contractile apparatus of muscle fibers by measuring their transversal stiffness by atomic force microscopy in a three-day reloading after a 14-day gravity disuse, which was carried out by hind-limbs suspension. The object of the study was the soleus muscle of the Wistar rat. It was shown that after 14 days of disuse, there was a reduction of transversal stiffness of all points of the sarcolemma and contractile apparatus. Readaptation for 3 days leads to complete recovery of the values of the transversal stiffness of the sarcolemma and to partial value recovery of the contractile apparatus. The changes in transversal stiffness of sarcolemma correlate with beta-actin and alpha-actinin-4 in membrane protein fractions.