Abstract
Cultured normal human fibroblasts during in vitro aging exhibited increased proportions of heparan sulfate (HS; a glycosaminoglycan (GAG) species) in the cell-associated GAG pool, coincident with decreased cell growth activity. An analysis of GAG metabolism demonstrated that human fibroblasts during aging became relatively rich in HS due to an alteration in the profile of GAG synthesis. HS became relatively enriched and hyaluronic acid (HA) relatively depleted through a decrease in HA synthase activity. An experimental enrichment of human fibroblast cultures with exogenous HS brought about an arrest of the cells in the G0/G1 phase and a decrease in the rate of S phase entry, coincident with aged cell growth behaviour. These results suggest that the change in HA synthesis is responsible, at least to some extent, for the growth reduction during aging of normal human fibroblasts.
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Matuoka, K., Hasegawa, N., Namba, M. et al. A decrease in hyaluronic acid synthesis by aging human fibroblasts leading to heparan sulfate enrichment and growth reduction. Aging Clin Exp Res 1, 47–54 (1989). https://doi.org/10.1007/BF03323875
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DOI: https://doi.org/10.1007/BF03323875