Document Detail

Calcaneal tendon regions exhibit different MMP-2 activation after vertical jumping and treadmill running.
MedLine Citation:
PMID:  19685505     Owner:  NLM     Status:  MEDLINE    
Increased activity of matrix metalloproteinases (MMPs) -2 and -9 was found in calcaneal tendon after physical training. However, little attention has been given to the distinct biomechanical and tissue structure of the calcaneal tendon's proximal and distal regions. Herein, we evaluated the effect of two types of physical activities on tendon morphology and matrix metalloproteinase activities in the proximal and distal regions of rat calcaneal tendon, separately. Adult male Wistar rats from control, water-adapted, vertical-jumping, and treadmill-running groups were sacrificed after 1 or 4 days of physical exercise, 6 hr after the end of that day's exercise session. Tendons were processed for histology, morphometry, and gelatin zymography. Tendons from adapted and trained animals showed active secretory cells and increased thickness, cellularity, and blood vessel volume fraction of peritendinous sheath, but without inflammatory process. In the proximal region, both pro- and active MMP-2 were increased after vertical jumping, but only pro-MMP-2 was increased after treadmill running. In contrast, in the distal region, both exercise types increased the activity of pro- and active MMP-2, especially treadmill running, which increased the active MMP-2 by about 11- and eightfold, respectively, after 1 and 4 days of training. No activity of MMP-9 was observed in either tendon region in this study. In conclusion, distal and proximal regions of calcaneal tendon exhibit differential intensities of tissue remodeling after treadmill running or vertical jumping and MMP-2, in the absence of inflammation, plays a major role in this adaptive response.
Olga Cristina De Mello Malheiro; Camila Tateishi Giacomini; Luis Antonio Justulin; Fl??via Karina Delella; Maeli Dal-Pai-Silva; S??rgio Luis Felisbino
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Anatomical record (Hoboken, N.J. : 2007)     Volume:  292     ISSN:  1932-8494     ISO Abbreviation:  Anat Rec (Hoboken)     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-09-29     Completed Date:  2009-12-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101292775     Medline TA:  Anat Rec (Hoboken)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1656-62     Citation Subset:  IM    
S??o Paulo State University (UNESP), School of Science and Technology, Department of Physical Education, Presidente Prudente, SP, Brazil.
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MeSH Terms
Achilles Tendon / enzymology*
Enzyme Activation
Extracellular Matrix / metabolism
Matrix Metalloproteinase 2 / metabolism*
Matrix Metalloproteinase 9 / metabolism*
Motor Activity*
Rats, Wistar
Reg. No./Substance:
EC Metalloproteinase 2; EC protein, rat; EC Metalloproteinase 9

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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