Bone cells required for osteoclastic resorption but not for osteoclastic differentiation

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 E(2) and 1,25(OH)(2)vitamin D-3, 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. (C) 1996 Academic Press, Inc.