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Physical Exercise Affects Cell Proliferation in Lumbar Intervertebral Disc Regions in Rats.
MedLine Citation:
PMID:  22366967     Owner:  NLM     Status:  Publisher    
ABSTRACT: Study Design. Descriptive experimental study.Objective. The aim of this study was to investigate the effect of exercise on cell proliferation in different areas of the IVD and recruitment of cells possibly active in regeneration of normal rat lumbar IVDs.Summary of Background Data. Little is known about the effects of physical exercise on lumbar intervertebral disc (IVD) tissue. Recently, stem cell niches in the perichondrium area of the IVD were identified and cells in these niches have been suggested to be involved in the normal regeneration of the IVD.Methods. Thirty Sprague-Dawley rats were exposed to 5-bromo-2-deoxyuridine (BrdU) diluted in the drinking water during 14 days. Fifteen rats ran on a treadmill daily for 50 min/day, 5 days/week (exercise group) and 15 non-exercised rats served as controls. Immunohistochemical analyses (anti-BrdU antibody) were performed at 9, 14, 28, 56 and 105 days after the start of the exercise protocol. BrdU positive cells were counted in the stem cell niche area (SN), peripheral region of epiphyseal cartilage area (pEC), the annulus fibrous outer and inner area (AFo and AFi). Data were analyzed by two-way ANOVA (significance level; p<0.05).Results. The BrdU positive cell numbers in the SN and AFo region were increased in discs from the exercising group on days 14 (p<0.01) and 105 (p<0.05) and at day 14 (p<0.01) in the pEC region as compared to controls.Conclusions. Physical exercise was shown to have positive effects on cell proliferation in intervertebral discs with involvement of various disc regions, indicating a differential response by disc tissue to exercise depending on anatomical location and tissue characteristics.
Nobuyuki Sasaki; Helena Barreto Henriksson; Eva Runesson; Karin Larsson; Miho Sekiguchi; Shin-Ichi Kikuchi; Shin-Ichi Konno; Björn Rydevik; Helena Brisby
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-23
Journal Detail:
Title:  Spine     Volume:  -     ISSN:  1528-1159     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-2-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7610646     Medline TA:  Spine (Phila Pa 1976)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Department of Orthopaedics, Institute of Clinical Sciences, University of Gothenburg, Gothenburg, Sweden 2The Institute of Biomedicine, Department of Clinical Chemistry and Transfusion medicine, University of Gothenburg, Gothenburg, Sweden 3Department of Orthopaedic Surgery, Fukushima Medical University, School of Medicine, Fukushima, Japan.
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