In vitro formation of hybrid fibrils of type V collagen and type I collagen. Limited growth of type I collagen into thick fibrils by type V collagen.

Type V collagen and type I collagen were obtained from human placentas by pepsin treatment, followed by salt fractionation. The precipitates formed at 37 degrees C from a mixed solution of type V collagen and type I collagen, reacted with antibodies to either type V collagen or type I collagen. The precipitates seen by electron microscopy were fine flexible fibrils, with a D-periodic banding pattern. The average diameter of hybrid fibrils was smaller than 50 nm, when the proportion of type V collagen exceeded that of type I collagen. Type V collagen directly interacts with type I collagen in forming hybrid fibrils, resulting in limitation of the growth of type I collagen fibrils into thicker fibrils. We propose that the fibrils with a predominant type V collagen content may occur in the pericellular environment of various tissues, as a basic structure in connecting basal laminae with interstitial collagen fibrils.

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