Abstract
Calcitonin receptors have been characterized for the first time in isolated osteoclasts. These receptors have been demonstrated by autoradiographic and biochemical methods, and the cells have also been shown to respond to calcitonin with a dose-dependent increase in cyclic AMP. The receptors in rat osteoclasts are specific and of high affinity (dissociation constant, Kd, 1 to 6 X 10(-10) M), and are present in greater numbers than in any cell previously studied (greater than 10(6) per cell). Chemical cross-linking of 125I-labeled salmon calcitonin to osteoclasts using disuccinimidyl suberate resulted in identification of a receptor component with a relative molecular weight of 80,000-90,000. By counting grains in autoradiographic experiments, we found that greater than 80% of specifically bound radioactivity was associated with multinucleate osteoclasts and the remainder was associated with mononuclear cells that are not osteoblasts, but that may be osteoclast precursors.
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Selected References
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