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. 1995 Jul 15;309(Pt 2):649–656. doi: 10.1042/bj3090649

Synthesis and release of hyaluronic acid by Swiss 3T3 fibroblasts.

J R Kitchen 1, R L Cysyk 1
PMCID: PMC1135780  PMID: 7626032

Abstract

Hyaluronic acid (HA) and its synthesis were studied in intact Swiss 3T3 mouse fibroblasts and isolated membranes. HA chains in culture medium, attached to cells and in isolated membranes, were determined to possess average M(r) values of 5.2 x 10(6), 1.8 x 10(6) and 0.14 x 10(6) respectively. Log cells were determined to possess 680,000 HA molecules/cell, and to release 120,000 HA chains/h. The time required for intact cells to synthesize and release a complete HA chain was approximately 4 h, with elongation proceeding at a rate of 57 dimers/min. The amount of cell-associated HA of various cell populations correlated strongly with their rate of HA release into culture media and with the HA synthetase activity determined for their membranes. Prevention of protein synthesis with cycloheximide decreased the rate of HA synthesis of log cells and HA synthetase activity of isolated membranes by 50% within 2-3 h. Because of the similarity between the biological lifetime of HA synthetase and the time required to synthesize a HA chain, we propose a model where each synthetase makes only one HA chain; after synthesis of a complete HA chain, HA synthetase activity is terminated as its HA chain is released from the cell.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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