Nov 1, 1977

The role of three genetically distinct collagen types in endochondral ossification and calcification of cartilage

The Journal of Bone and Joint Surgery. British Volume
K von der Mark, H von der Mark

Abstract

The role of three genetically distinct collagen types in the formation of endochondral bone and in calcification and resorption of cartilage has been assessed. Using antibodies specific to types I, II and III collagen we have demonstrated in the embryonic chick tibia that endochondral bone formation began with deposition of type III collagen in lacunae of hypertropic chondrocytes by invading bone-marrow-derived cells. This was followed by the deposition of type I collagen, which is the collagenous constituent of endochondral osteoid. At later stages of development endochondral osteoid was found in the epiphysial growth plate in apparently intact lacunae of hypertrophic chondrocytes; this indicated that the latter might contribute to the synthesis of osteoid type I collagen. Immuno-histological staining for collagen types, and von Kossa staining for calcium phosphate on parallel sections, demonstrated that type I and type II collagen matrices were substrates for calcification. Endochondral bone (with type I collagen) was found on scaffolding of both uncalcified and calcified cartilage (with type II collagen), indicating that calcification of endochondral osteoid and of the underlying cartilage occurred independentyl. Spicules of...Continue Reading

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Mentioned in this Paper

Embryo
Immunofluorescence Assay
Trabecular Substance of Bone
Endochondral Ossification
Hypertrophic Cardiomyopathy
Collagen Diseases
Hypertrophy
Chondrocyte
Osteoid
Zyderm

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