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Phosphatases within the cartilage of the mandibular condyle of the mouse.

The histological aspects of endochondral ossification are fairly well known, while histochemical, biochemical and electron microscopic investigations regarding the mechanism of its various phases are still in progress. There is now an upsurge of interest in the role played by various hydrolytic enzymes in the process of mineralization and ossification. It has been recently suggested by Matsuzawa & Anderson (1971) and by Thyberg & Friberg (1972) that the mechanism of calcification in cartilage is enzymic and that alkaline phosphatase, adenosine triphosphatase (ATPase) and acid phosphatase may play a role in the calcification mechanism. Furthermore, Wuthier et al. (1972) suggested that inorganic pyrophosphatase might also have a role in the above process, and that a neutral pyrophosphatase appears at the onset of calcification. The purpose of the present study was to describe the pattern of distribution of phosphatases in the condylar cartilage of young mice. An attempt was made to relate the activity of these enzymes to the process of cartilage calcification.