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Am J Physiol Regul Integr Comp Physiol 280: R1292-R1300, 2001;
0363-6119/01 $5.00
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Vol. 280, Issue 5, R1292-R1300, May 2001

Acute exercise induced changes in rat skeletal muscle mRNAs and proteins regulating type IV collagen content

S. O. A. Koskinen1, W. Wang1, A. M. Ahtikoski1, M. Kjær2, X. Y. Han1, J. Komulainen3, V. Kovanen4, and T. E. S. Takala1,5

1 Neuromuscular Research Center, Department of Biology of Physical Activity, 4 Department of Health Sciences, University of Jyväskylä, 40351 Jyväskylä, 3 LIKES Research Center for Sport and Health Sciences, 40700 Jyväskylä, 5 Department of Sports Medicine, Deaconess Institute of Oulu, 90100 Oulu, Finland; 2 Sports Medicine Research Unit, Bispebjerg Hospital, 2400 Copenhagen NV, and Copenhagen Muscle Research Centre, Rigshospitalet, 2100 Copenhagen Ø, Denmark

This experiment tested the hypothesis that running-induced damage to rat skeletal muscle causes changes in synthesis and degradation of basement membrane type IV collagen and to proteins regulating its degradation. Samples from soleus muscle and red and white parts of quadriceps femoris muscle (MQF) were collected 6 h or 1, 2, 4, or 7 days after downhill running. Increased muscle beta -glucuronidase activity indicated greater muscle damage in the red part of MQF than in the white part of MQF or soleus. In the red part of MQF, type IV collagen expression was upregulated at the pretranslational level and the protein concentration decreased, whereas matrix metalloproteinase-2 (MMP-2), a protein that degrades type IV collagen, and tissue inhibitor of metalloproteinase-2 (TIMP-2), a protein that inhibits degradation, were increased in parallel both at mRNA and protein levels. Type IV collagen mRNA level increased in the white part of MQF and soleus muscle. The protein concentration increased in the white part of MQF and was unchanged in soleus muscle. MMP-2 and TIMP-2 changed only slightly in the white part of MQF and soleus muscle. The changes seem to depend on the severity of myofiber injury and thus probably reflect reorganization of basement membrane compounds.

matrix metalloproteinase; tissue inhibitor of metalloproteinase; damage; collagen degradation


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