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Chick osteoblasts contain fluoride-sensitive acid phosphatase activity

MW Lundy, KH Lau, HC Blair and DJ Baylink

Department of Medicine, Loma Linda University, California 92357.

We used histological and biochemical methods to determine the cellular origin of bone matrix fluoride-sensitive acid phosphatase in chicken bone. Embryonic chicken calvariae were embedded in plastic and sections stained for acid phosphatase at various concentrations of substrate and fluoride. Acid phosphatase activity was observed in osteoblasts and osteoclasts but not in fibroblasts. Striking inhibition of osteoblastic acid phosphatase occurred at 100 microM fluoride, a concentration that had no apparent effect on osteoclastic acid phosphatase. Inhibition of osteoblastic and osteoclastic acid phosphatase by fluoride was also examined using extracts of embryonic chicken calvarial cells, mouse osteoblasts (MC3T3-El cell line), and purified chick osteoclasts, respectively. Fluoride is a partial competitive inhibitor of both chicken and mouse osteoblastic acid phosphatases, with apparent inhibition constants of 10-100 microM. These concentrations of fluoride correspond to those that increase bone formation in vitro and in vivo. In contrast, the apparent inhibition constant for fluoride of osteoclastic acid phosphatase was much higher (i.e., 0.5 mM). In summary, this study demonstrates that chicken osteoblasts contain an acid phosphatase that is sensitive to inhibition by low concentrations (i.e., microM) of fluoride.

Volume 36, Issue 9, pp. 1175-1180, 09/01/1988
Copyright © 1988 by The Histochemical Society


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J.S. Schultz
Chemical Sensors and Biosensors for Fluoride: Current Status and Developing Technologies
Advances in Dental Research, June 1, 1994; 8(1): 100 - 104.
[Abstract] [PDF]



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