title: Bone cells required for osteoclastic resorption but not for osteoclastic differentiation.
abstract: It is generally considered that osteoblastic cells are essential for osteoclast formation. We tested the ability of hemopoietic tissue to differentiate osteoclastic characteristics in the absence of osteoblastic cells. We found that large numbers of calcitonin-receptor positive (CTRP) cells can be induced by prostaglandin E2 and 1,25(OH)2 vitamin D3, in cultures of hemopoietic mouse spleen. Moreover, spleen stromal cells were equivalent to bone marrow stromal cells in CTRP-cell induction. The spleen CTRP cells did not resorb bone, but were rapidly induced to full resorptive activity upon osteoblast addition. Thus, bone cells may not be essential for osteoclast formation, but rather are required to activate and regulate the resorptive function of mature osteoclasts.
authors.affiliation: Department of Histopathology, St. George's Hospital Medical School, London, United Kingdom.
authors.forename: J M
authors.initials: JM
authors.lastname: Owens
authors.forename: A C
authors.initials: AC
authors.lastname: Gallagher
authors.forename: T J
authors.initials: TJ
authors.lastname: Chambers
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D001862:Bone Resorption; D002117:Calcitriol / Q000494:pharmacology; D002454:Cell Differentiation; D002460:Cell Line; D018920:Coculture Techniques; D015232:Dinoprostone / Q000494:pharmacology; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000502:physiology; D007700:Kinetics; D051379:Mice; D010010:Osteoclasts / Q000166:cytology* / Q000187:drug effects; D018003:Receptors, Calcitonin / Q000502:physiology; D013154:Spleen / Q000166:cytology
chemical_list: D018003:Receptors, Calcitonin; D002117:Calcitriol; D015232:Dinoprostone