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Effect of Growth Hormone on the Distribution of Decorin and Biglycan during Odontogenesis in the Rat Incisor

Department of Dentistry, The University of Queensland, Turbot Street, Brisbane, QLD 4072, Australia

H. Li

Department of Dentistry, The University of Queensland, Turbot Street, Brisbane, QLD 4072, Australia

P.M. Bartold

Department of Dentistry, The University of Queensland, Turbot Street, Brisbane, QLD 4072, Australia

W.G. Young

Department of Dentistry, The University of Queensland, Turbot Street, Brisbane, QLD 4072, Australia

M.J. Waters

Department of Physiology & Pharmacology, The University of Queensland, Turbot Street, Brisbane, QLD 4072, Australia

Previous studies have shown that growth hormone can influence the expression of N-acetylgalactosamine-containing molecules in the extracellular matrix of developing rat incisors. N-acetylgalactosamine is a principal component of proteoglycans containing chondroitin sulfate and dermatan sulfate, as well as of some glycoproteins. Since chondroitin sulfate proteoglycans are identifiable components in enamel, dentin, and cementum, we have tested the hypothesis that growth hormone modulates their expression in developing rat incisors. The distribution of the chondroitin-sulfate-rich proteoglycans, decorin and biglycan, was investigated. We used the Lewis dwarf rat as a model because their circulating growth hormone levels are markedly reduced. Polyclonal antibodies against decorin and biglycan were used to localize these two proteoglycans. Semi-quantitative assessments of the staining patterns and intensities were made for each proteoglycan within compartments of the developing teeth. In normal Lewis rats, decorin and biglycan differentially expressed throughout the enamel organ, dental papilla, and dental follicle. Decorin displayed a wide distribution throughout all three regions and was closely associated with different cellular components. In contrast, biglycan showed little association with cells and was identified in the predentin and osteoid matrices. The expression of both proteoglycans was dramatically decreased in the growth-hormone-deficient animals. Administration of growth hormone to the dwarf rats markedly elevated the expression of both proteoglycans, approximating the distribution and intensity of staining seen in normal animals. These findings confirm that growth hormone status can modulate the expression of decorin and biglycan, and hence matrix deposition, in the rat tooth.

Key Words: odontogenesis • tooth • growth hormone • proteoglycan

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Journal of Dental Research, Vol. 74, No. 10, 1636-1643 (1995)
DOI: 10.1177/00220345950740100301


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Zhang, C.Z. Articles by Waters, M.J. Search for Related Content PubMed PubMed Citation Articles by Zhang, C.Z. Articles by Waters, M.J. Social Bookmarking                         What's this?