Abstract
Osteoclasts attach to the bone surface and resorb bone by secreting protons into an isolated subosteoclastic compartment. Previous studies have shown the presence of a vacuolar type H+-ATPase, and a functional Cl−-HCO −3 anion exchanger in the osteoclast. In the present studies, using a monoclonal antibody to the 31-kDa subunit of H+-ATPase and a rabbit antiserum to the erythrocyte band-3 protein (Cl−-HCO −3 anion exchanger) we have immunocytochemically localized the respective pumps in bone sections obtained from chickens fed a normal or a calcium-deficient diet for 4 weeks. Our results indicate that although H+-ATPase is either evenly distributed throughout the osteoclast or is more polarized at its ruffled membrane juxtaposed to the bone surface, the band-3 protein immunoreactivity is always localized to the plasma membrane which is not attached to the bone surface (basolateral membrane). Four weeks of a calcium-deficient diet resulted in a significant increase in the percentage of osteoclasts that were polarized for the H+-ATPase pump at their ruffled membrane, and a trend toward increased total number of osteoclasts, although the latter did not reach statistical significance (P =0.09). These changes were not accompanied by a significant increase in the intensity of staining for H+-ATPase. Band-3 protein immunoreactivity was always prominent, limited to the basolateral membrane, and did not alter with calcium-deficient diet or with changes in the degree of H+-ATPase polarization.
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Parts of this work have been presented in the American Society of Nephrology in November 1992
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Bastani, B., Ross, F.P., Kopito, R.R. et al. Immunocytochemical localization of vacuolar H+-ATPase and Cl−-HCO −3 anion exchanger (erythrocyte band-3 protein) in avian osteoclasts: Effect of calcium-deficient diet on polar expression of the H+-ATPase pump. Calcif Tissue Int 58, 332–336 (1996). https://doi.org/10.1007/BF02509381
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DOI: https://doi.org/10.1007/BF02509381