Effect of the flavonoid (+)cyanidanol-3 on procollagen biosynthesis and transport in normal and ataxia telangiectasis cultured skin fibroblasts.

The synthesis and secretion of procollagen into the medium of cultures of human skin fibroblasts from normal individuals and from patients with the genetic disorder, ataxia telangiectasia, are markedly inhibited by the flavonoid (+)cyanidanol-3. Those proteins which were secreted into the medium in the presence of cyanidanol were resistant to collagenase treatment (noncollagenous proteins). Polyacrylamide gel electrophoresis revealed the presence of only one noncollagenous protein of 66,000 daltons in the medium of cyanidanol-treated cells as compared with the nine other polypeptides found in the medium of untreated cells.