title: Preparation and characterization of a mouse osteoclast-like multinucleated cell population.
abstract: We have reported that numerous tartrate-resistant acid phosphatase-positive osteoclast-like multinucleated cells (TRAP+ MNCs) are formed when mouse osteoblastic cells and spleen cells are cocultured in the presence of 1 alpha,25-dihydroxyvitamin D3 [1 alpha,25-(OH)2D3] (Endocrinology 123:2600, 1988). In this study, we prepared a TRAP+ MNC population using a modified coculture system and examined its osteoclastic properties. TRAP+ MNCs were formed in cocultures of mouse osteoblastic cells and marrow cells on 10 cm collagen gel-coated dishes. The TRAP+ MNC population was prepared by treating the dishes with 0.2% bacterial collagenase followed by density gradient centrifugation. The yield of TRAP+ MNCs was 20,000-40,000 cells per dish, much higher than that of osteoclasts (OCLs) isolated from neonatal rat bones (approximately 1000 cells per head). The purity of TRAP+ MNCs was 5.6 +/- 0.6% in cell number and about 30% in the number of nuclei. The recovery of TRAP+ MNCs after density gradient centrifugation was 30-40%. Acid production by MNCs was demonstrated by vital staining with acridine orange. Numerous resorption pits were formed when the MNC population was cultured for 48 h on bone slices. Autoradiography using [125I]salmon calcitonin (CT) showed abundant CT binding in most TRAP+ MNCs. Saturation analysis of [125I]salmon CT indicated a dissociation constant Kd for TRAP+ MNCs of 8.9 +/- 0.7 x 10(-10) M and 16.5 +/- 1.5 x 10(6) binding sites per cell. These results were similar to the Kd value (3.5 x 10(-10) M) and the number of binding sites (3.3 x 10(6) per cell) in isolated rat OCLs. Displacement curves for [125I]salmon CT with unlabeled salmon and human CT were similar in MNC and OCL preparations. Salmon and human CT increased cAMP production (maximal response: slmon CT at 10(-10) M, human CT at 10(-8) M; ED50s: salmon CT, 2.2 x 10(-11) M, human CT, 1.3 x 10(-9) M) in the MNC preparation. These results indicate that a large number of mouse TRAP+ MNCs possessing OCL characteristics can be easily prepared from in vitro cultures. This procedure will facilitate examination of mammalian OCL functions.
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism*; D000165:Acridine Orange; D000818:Animals; D001345:Autoradiography; D001665:Binding Sites; D001854:Bone Marrow Cells; D001862:Bone Resorption; D002116:Calcitonin / Q000378:metabolism; D002478:Cells, Cultured; D002499:Centrifugation, Density Gradient; D051379:Mice; D010006:Osteoblasts / Q000166:cytology; D010010:Osteoclasts / Q000166:cytology* / Q000502:physiology; D051381:Rats; D017208:Rats, Wistar; D018003:Receptors, Calcitonin; D011956:Receptors, Cell Surface / Q000378:metabolism; D013194:Staining and Labeling
chemical_list: D018003:Receptors, Calcitonin; D011956:Receptors, Cell Surface; D002116:Calcitonin; D000135:Acid Phosphatase; D000165:Acridine Orange