The Masticatory Contractile Load Induced Expression and Activation of Akt1/PKB alpha in Muscle Fibers at the Myotendinous Junction within Muscle-Tendon-Bone Unit

作者：Korkmaz Yueksel; Klinz Franz J; Moghbeli Mehrnoush; Addicks Klaus; Raab Wolfgang H M; Bloch Wilhelm^*

来源：Journal of Biomedicine and Biotechnology, 2010, 163203.

DOI：10.1155/2010/163203

The cell specific detection of enzyme activation in response to the physiological contractile load within muscle-tendon-bone unit is essential for understanding of the mechanical forces transmission from muscle cells via tendon to the bone. The hypothesis that the physiological mechanical loading regulates activation of Akt1/PKB alpha at Thr308 and at Ser473 in muscle fibers within muscle-tendon-bone unit was tested using quantitative immunohistochemistry, confocal double fluorescence analysis, and immunoblot analysis. In comparison to the staining intensities in peripheral regions of the muscle fibers, Akt1/PKB alpha was detected with a higher staining intensity in muscle fibers at the myotendinous junction (MTJ) areas. In muscle fibers at the MTJ areas, Akt1/PKB alpha is dually phosphorylated at Thr308 and Ser473. The immunohistochemical results were confirmed by immunoblot analysis. We conclude that contractile load generated by masticatory muscles induces local domain-dependent expression of Akt1/PKB alpha as well as activation by dually phosphorylation at Thr308 and Ser473 in muscle fibers at the MTJ areas within muscle-tendon-bone unit.

• 出版日期2010