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Asynchronous Functional, Cellular and Transcriptional Changes After a Bout of Eccentric Exercise in the Rat

Overview
Journal J Physiol
Specialty Physiology
Date 2003 Sep 30
PMID 14514871
Citations 37
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Abstract

Thirty eccentric contractions (ECs) were imposed upon rat dorsiflexors (n = 46) by activating the peroneal nerve and plantarflexing the foot ~40 deg, corresponding to a sarcomere length change over the range 2.27-2.39 microm for the tibialis anterior and 2.52-2.66 microm for the extensor digitorum longus. Animals were allowed to recover for one of 10 time periods ranging from 0.5 to 240 h, at which time muscle contractile properties, immunohistochemical labelling and gene expression were measured. Peak isometric torque dropped significantly by ~40 % from an initial level of 0.0530 +/- 0.0009 Nm to 0.0298 +/- 0.0008 Nm (P < 0.0001) immediately after EC, and then recovered in a linear fashion to control levels 168 h later. Immunohistochemical labelling of cellular proteins revealed a generally asynchronous sequence of events at the cellular level, with the earliest event measured being loss of immunostaining for the intermediate filament protein, desmin. Soon after the first signs of desmin loss, infiltration of inflammatory cells occurred, followed by a transient increase in membrane permeability, manifested as inclusion of plasma fibronectin. The quantitative polymerase chain reaction (QPCR) was used to measure transcript levels of desmin, vimentin, embryonic myosin heavy chain (MHC), myostatin, myoD and myogenin. Compared to control levels, myostatin transcripts were significantly elevated after only 0.5 h, myogenic regulatory factors significantly elevated after 3 h and desmin transcripts were significantly increased 12 h after EC. None of the measured parameters provide a mechanistic explanation for muscle force loss after EC. Future studies are required to investigate whether there is a causal relationship among desmin loss, increased cellular permeability, upregulation of the myoD and desmin genes, and, ultimately, an increase in the desmin content per sarcomere of the muscle.

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References
1.
McPherron A, Lawler A, Lee S . Regulation of skeletal muscle mass in mice by a new TGF-beta superfamily member. Nature. 1997; 387(6628):83-90. DOI: 10.1038/387083a0. View

2.
Lieber R, Friden J . Selective damage of fast glycolytic muscle fibres with eccentric contraction of the rabbit tibialis anterior. Acta Physiol Scand. 1988; 133(4):587-8. DOI: 10.1111/j.1748-1716.1988.tb08446.x. View

3.
Lynn R, Morgan D . Decline running produces more sarcomeres in rat vastus intermedius muscle fibers than does incline running. J Appl Physiol (1985). 1994; 77(3):1439-44. DOI: 10.1152/jappl.1994.77.3.1439. View

4.
HUXLEY A . Muscle structure and theories of contraction. Prog Biophys Biophys Chem. 1957; 7:255-318. View

5.
Rudnicki M, Braun T, Hinuma S, Jaenisch R . Inactivation of MyoD in mice leads to up-regulation of the myogenic HLH gene Myf-5 and results in apparently normal muscle development. Cell. 1992; 71(3):383-90. DOI: 10.1016/0092-8674(92)90508-a. View