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. 1990 Jul 1;269(1):175–181. doi: 10.1042/bj2690175

Regulation of procollagen synthesis and processing during ascorbate-induced extracellular matrix accumulation in vitro.

D Chan 1, S R Lamande 1, W G Cole 1, J F Bateman 1
PMCID: PMC1131548  PMID: 2375750

Abstract

Procollagen biosynthesis and matrix deposition were studied in long-term human skin fibroblast cultures exposed to ascorbic acid. Ascorbic acid specifically stimulated types I and III collagen synthesis, reaching a maximum at day 2 and maintaining a specific high rate of production until day 10 of ascorbate exposure, after which collagen production declined. The increased level of collagen synthesis after different exposure times could also be achieved by only brief treatment (10 h) of parallel scorbutic (ascorbic-acid-deficient) cultures with ascorbic acid. This brief exposure did not result in increased collagen mRNA, thus demonstrating that the ascorbate-induced increase in collagen synthesis at all stages of ascorbic acid exposure was due to post-transcriptional mechanisms, most likely a rapid increase in type 1 collagen mRNA translational efficiency. This mechanism, rather than the transcriptional activation, was the primary response and is adequate to explain the ascorbate-induced increase in collagen synthesis. These data also demonstrate that the presence of a collagenous extracellular matrix was not involved in this collagen biosynthetic regulation. During long-term exposure (18 days) to ascorbic acid, a substantial cross-linked collagenous matrix formed, following an approximately sigmoidal time course. The most rapid matrix deposition occurred during the later days of exposure when the rate of collagen synthesis was decreasing, suggesting that the presence of a pre-existing matrix is important for further collagen accumulation. Procollagen was also efficiently processed to collagen during this phase, demonstrating that efficient procollagen processing is an important regulatory event in collagen matrix deposition.

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Selected References

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