Linked Life Data

8500548

Source:http://linkedlifedata.com/resource/pubmed/id/8500548

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pubmed-article:8500548pubmed:abstractTextAscorbic acid has been shown to stimulate collagen synthesis in monolayer cultures of human dermal fibroblasts. In the present studies, we examined whether the presence of a collagen matrix influences this response of dermal fibroblasts to ascorbic acid. Fibroblasts and collagen were mixed and allowed to gel and contract for 6 days to form a matrix prior to determining the concentration and time dependence for ascorbic acid to affect collagen synthesis by fibroblasts within the matrix. Collagen synthesis was stimulated at levels at or above 10 microM ascorbic acid and was maximal after 2 days of treatment. This concentration and time dependence is similar to that of cells grown in monolayer cultures. The effects of transforming growth factor-beta (TGF-beta) and fibroblast growth factor (FGF) were also examined in this model. TGF-beta increased and FGF inhibited collagen synthesis in the gels, as has been shown for cells in monolayer cultures. The effects of potential inhibitors of lipid peroxidation induced by ascorbic acid were also examined in these matrices and compared to previous results obtained in monolayer cultures. Propyl gallate, cobalt chloride, alpha,alpha-dipyridyl, and alpha-tocopherol inhibited the ascorbic acid-mediated stimulation of collagen synthesis while mannitol had no effect. Natural retinoids inhibited total protein synthesis without the specific effect on collagen synthesis that was seen in monolayer cultures. These results indicate that ascorbic acid stimulates collagen synthesis in fibroblasts grown in a collagen matrix in a manner similar to that found in monolayer cultures. In contracting collagen gels, however, the magnitude of the effect is less and retinoids do not specifically inhibit collagen synthesis.lld:pubmed
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pubmed-article:8500548pubmed:articleTitleRegulation of collagen synthesis in human dermal fibroblasts in contracted collagen gels by ascorbic acid, growth factors, and inhibitors of lipid peroxidation.lld:pubmed
pubmed-article:8500548pubmed:affiliationDepartment of Biochemistry, University of Medicine & Dentistry of New Jersey, Robert Wood Johnson Medical School, Piscataway 08854.lld:pubmed
pubmed-article:8500548pubmed:publicationTypeJournal Articlelld:pubmed
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