FURTHER OBSERVATIONS ON OXIDATIVE ENZYME ACTIVITIES IN DECALCIFIED BONE AND TEETH

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Abstract
There was considerable cytochrome-oxidase, glyceraldehyde-3-phosphate-dehydrogenase and dihydrolipoic-dehydrogenase activity in various cells of bones and teeth of mice. Osteoclasts revealed relatively strongest enzyme activity; but ameloblasts, osteoblasts, odontoblasts, mesenchymal cells of the dental pulp and osteocytes showed enzyme activities (decreasing in intensity approximately in this order). There was relatively slight dihydroorotate-dehydrogenase activity in the osteoclasts, ameloblasts and odontoblasts, while other cells in bone and teeth were essentially negative. This demonstrates the capability of calcified tissues to utilize different enzymatically controlled metabolic pathways.