Systemic hypoxia alters gene expression levels of structural proteins and growth factors in knee joint cartilage |
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Authors: | Hofstaetter Jochen G Wunderlich Livius Samuel Raymond E Saad Fawzy A Choi Yeong-Hoon Glimcher Melvin J |
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Institution: | Laboratory for Skeletal Disorders and Rehabilitation, Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02215, USA. Jochen.Hofstaetter@childrens.harvard.edu |
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Abstract: | We investigated the effects of short- (8- and 24-h) and long-term (3 weeks) exposure to systemic normobaric hypoxia (13%) on the gene expression level of structural proteins and growth factors in knee joint cartilage of rabbits. Collagen type Ia2, II, and Va1, TGF-beta1, and b-FGF were upregulated after short-term hypoxia in both menisci, but not in articular cartilage. In contrast, long-term hypoxia downregulated gene expression level of collagens, aggrecan, and growth factors in articular cartilage and meniscal fibrocartilage. Interestingly, gene expression levels of non-collagenous proteins biglycan, decorin, and versican were not affected by short-term or by long-term hypoxia in knee joint cartilage. The present study suggests that changes in oxygen level differentially affect gene expression levels of growth factors, collagens, and non-collagenous proteins in normal knee joint cartilage in rabbits. |
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Keywords: | Knee Cartilage Meniscus Collagen Aggrecan Hypoxia Biglycan Versican Decorin |
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