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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Gene expression in distinct regions of rat tendons in response to jump training combined with anabolic androgenic steroid administration

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Author(s):
Marqueti, Rita de Cassia [1] ; Heinemeier, Katja Maria [2, 3] ; Quaglioti Durigan, Joao Luiz [1] ; de Andrade Perez, Sergio Eduardo [1] ; Schjerling, Peter [2, 3] ; Kjaer, Michael [2, 3] ; Carvalho, Hernandes Faustino [4] ; Selistre-de-Araujo, Heloisa Sobreiro [1]
Total Authors: 8
Affiliation:
[1] Univ Fed Sao Carlos, Dept Physiol Sci, BR-13560 Sao Carlos, SP - Brazil
[2] Univ Copenhagen, Bispebjerg Hosp, Inst Sports Med Copenhagen, Dept Orthoped Surg, Fac Hlth Sci, Copenhagen - Denmark
[3] Univ Copenhagen, Ctr Healthy Aging, Copenhagen - Denmark
[4] Univ Estadual Campinas, Dept Anat Cell Biol Physiol & Biophys, Campinas, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY; v. 112, n. 4, p. 1505-1515, APR 2012.
Web of Science Citations: 14
Abstract

The aim of this study was to evaluate the expression of key genes responsible for tendon remodeling of the proximal and distal regions of calcaneal tendon (CT), intermediate and distal region of superficial flexor tendon (SFT) and proximal, intermediate and distal region of deep flexor tendon (DFT) submitted to 7 weeks of jumping water load exercise in combination with AAS administration. Wistar male rats were grouped as follows: sedentary (S), trained (jumping water load exercise) (T), sedentary animals treated with AAS (5 mg/kg, twice a week) and animals treated with AAS and trained (AAST). mRNA levels of COL1A1, COL3A1, TIMP-1, TIMP-2, MMP-2, IGF-IEa, GAPDH, CTGF and TGF-beta-1 were evaluated by quantitative PCR. Our main results indicated that mRNA levels alter in different regions in each tendon of sedentary animals. The training did not alter the expression of COL1A1, COL3A, IGF-IEa and MMP-2 genes, while AAS administration or its combination with training reduced their expression. This study indicated that exercise did not alter the expression of collagen and related growth factors in different regions of rat tendon. Moreover, the pattern of gene expression was distinct in the different tendon regions of sedentary animals. Although, the RNA yield levels of CT, SFT and DFT were not distinct in each region, these regions possess not only the structural and biochemical difference, but also divergence in the expression of key genes involved in tendon adaptation. (AU)