By David W. L. Hukins (eds.)
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Extra resources for Calcified Tissue
Except under extraordinary circumstances, osteoclasts are unable to excavate non-mineralised substances, and it has been suggested that this thin layer of collagen acts as a barrier to their gaining access to the mineralised bone matrix. It is proposed that, in response to appropriate stimuli (possibly parathormone), endosteal cells secrete collagenases which break down this collagen layer, exposing mineralised bone and thus facilitating osteoclastic resorption (Chambers, 1980). Although this concept is still speculative, there is no question that exposed mineralised material, wherever it may occur, is the single most potent stimulus to osteoclasis.
1982). The coupling of bone formation to bone resorption: a critical analysis of the concept and of its relevance to the pathogenesis of osteoporosis. Metab. Bone Dis. Ret. , 4, 1-6 40 Calcified Tissue Peck, W. , Shen, V. and Rifas, L. (1983). Locally elaborated factors in the co-ordination of bone cell activity. In Clinical Disorders of Bone and Mineral Metabolism (eds B. Frame and J. T. Potts), Excerpta Medica, Amsterdam, pp. 179-82 Pommer, G. (1925). Untersuchhung iiber Osteomalacia und Rachitis nebst Beitragen zur Kenntis der Knochrenresorption und apposition im verschiedenen Altersperioden und der durchbohrenden Gefiisse.
And Arnaud, C. D. (1982). Parathyroid hormone receptor in intact embryonic chick bones: characterisation and cellular localisation. J. , 94, 379-86 Vanderwiel, C. J. (1980). An ultrastructural study of the components which make up the resting surface of bone. Metab. Bone Dis. Rei. , 25, 109-16 3 Scanning X-ray microradiography and microtomography of calcified tissues J. C. Elliott, P. Anderson, R. D. Dover INTRODUCTION The rigidity of a calcified tissue derives almost entirely from its mineral content.