Altered posttranslational modifications of collagen in keloid.
Journal Article (Journal Article)
Keloid is a tissue with an excessive accumulation of collagen. In this study, we have partially characterized post-translational modifications of type I collagen in human keloid in order to pursue their potential involvement in this pathology. The levels of lysyl hydroxylation of the helical portions of alpha 1 and alpha 2 chains of type I collagen in keloid were significantly higher than those of normal, while the levels of prolyl hydroxylation were identical between these two groups. The contents of the major reducible cross-links in dermal collagen, dehydro-hydroxylysinonorleucine and dehydro-histidinohydroxymero-desmosine, were both significantly higher in keloids (up to sixfold) than those of normal. In addition, significant amounts of hydroxylysine-aldehyde derived cross-links that are characteristic of skeletal tissue collagens, dehydro-dihydroxylysinonorleucine (about 0.3 mole/mole of collagen) and pyridinoline (about 0.1 mole/mole of collagen), were found in keloids. These results indicate that keloid-forming cells are phenotypically different from those in normal dermis and that the collagen produced is highly cross-linked. The increased cross-linking provides the fibrils with more stability that may result in an accumulation of collagen.
Full Text
Duke Authors
Cited Authors
- Uzawa, K; Marshall, MK; Katz, EP; Tanzawa, H; Yeowell, HN; Yamauchi, M
Published Date
- August 28, 1998
Published In
Volume / Issue
- 249 / 3
Start / End Page
- 652 - 655
PubMed ID
- 9731191
International Standard Serial Number (ISSN)
- 0006-291X
Digital Object Identifier (DOI)
- 10.1006/bbrc.1998.8955
Language
- eng
Conference Location
- United States