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. 1981 Dec;78(12):7360–7364. doi: 10.1073/pnas.78.12.7360

Ultrastructural identification of extension aminopropeptides of type I and III collagens in human skin.

R Fleischmajer, R Timpl, L Tuderman, L Raisher, M Wiestner, J S Perlish, P N Graves
PMCID: PMC349266  PMID: 7038677

Abstract

Human skin was labeled with purified antibodies against type II and III collagens and against their extension aminopropeptides by using the ferritin technique. Both aminopropeptides were visualized mainly along thin collagenous fibrils (diameter, 20-40 nm) and rarely in nonfibrillar regions of the skin. The labeling showed a periodicity of 60-65 nm resembling the D (67 nm) stagger of collagen molecules. Blocking of antibodies with aminopropeptides and treatment of tissues with procollagen NH2-terminal protease abolished labeling. Antibodies against type I collagen uniformly labeled approximately equal to 80% of the fibrils (diameter, 20-80 nm), while reaction with antibodies against type III collagen was restricted to thin fibrils. It is currently thought that the aminopropeptides of procollagen molecules are cleaved after they are released from the cell and before fibril formation. Our data indicate that aminopropeptides are removed at the fibrillar level and that fibril growth can be regulated by extracellular procollagen processing.

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

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