Abstract:
:The physiologically active form of vitamin D3, 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) has influence over osteoclastogenesis and myelopoiesis, but the regulational mechanism is not well-defined. In this report, formation of osteoclast-like (OCL) cells from primitive myeloid colony-forming cells (PM-CFC) as mediated by 1,25(OH)2D3 was examined. Our results present in this report clearly show that 1,25(OH)2D3 dose-dependently stimulated OCL cell formation when added to suspension cultures of individually replated PM-CFC colonies. Marrow cells were plated with either granulocyte-macrophage colony-stimulating factor (GM-CSF) or the human bladder carcinoma cell line 5637 conditioned medium (5637 CM) as the source of colony-stimulating activity. The 1,25(OH)2D3 effect of osteoclast differentiation was associated with a concomitant decrease in clonogenic growth of myelopoietic progenitors in response to colony-stimulating activity. Secondly, the effect of adding the known stimulator of hematopoiesis, interleukin-1beta (IL-1beta) and/or 1,25(OH)2D3 on human myeloid colony growth was assessed. IL-1beta enhanced the formation of primitive myeloid colonies in response to GM-CSF by 160%. On the other hand, 1,25(OH)2D3 dose-dependently inhibited both GM-CSF- and 5637 CM-driven myeloid colony formation by as much as 90% at 100 nM. Addition of IL-1beta to GM-CSF-stimulated cultures dampened the inhibitory effect of 1,25(OH)2D3. The inhibition of myeloid clonogenic growth by 1,25(OH)2D3 was almost abolished (89%) by simultaneously adding anti-tumor necrosis factor-alpha monoclonal antibody (anti-TNF-alpha MoAb) to the culture medium. These results collectively suggest divergent roles for 1,25(OH)2D3 in osteoclastogenesis and myelopoiesis, promoting the differentiation of OCL cells from primitive myeloid cells but inhibiting the proliferation of later myeloid progenitor cells. This inhibition of myeloid progenitors may be mediated by TNF-alpha.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Qi DY,Perkins SL,Kling SJ,Russell RGsubject
Has Abstractpub_date
1999-03-01 00:00:00pages
387-95issue
3eissn
0730-2312issn
1097-4644pii
10.1002/(SICI)1097-4644(19990301)72:3<387::AID-JCBjournal_volume
72pub_type
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