Abstract：
:Treatment of adherent peripheral blood mononuclear cells (PBMCs) with macrophage colony stimulating factor (M-CSF) and receptor activator of NF-kappaB ligand (RANKL) stimulates the formation of multinucleate osteoclast-like cells. Treatment with M-CSF alone results in the formation of macrophage-like cells. Through the use of Atlas human cDNA expression arrays, genes regulated by RANKL were identified. Genes include numerous cytokines and cytokine receptors (RANTES and CSF2R proportional, variant ), transcription factors (nuclear factor of activated T-cells cytoplasmic 1 (NFATc1) and GA binding protein transcription factor alpha (GABPalpha)), and ribosomal proteins (60S L17 and 40S S20). Real-time PCR analysis showed significant correlation (R2 of 0.98 P < 0.01) with array data for all genes tested. Time courses showed differential activation patterns of transcription factors with early induction of FUSE binding protein 1 (FBP) and c-Jun, and later steady upregulation of NFATc1 and GABP by RANKL. Treatment with cyclosporin A, a known NFATc1 inhibitor, resulted in a blockade of osteoclast formation. The mononuclear cells resulting from high cyclosporin treatment (1,000 ng/ml) were cathepsin K (CTSK) and tartrate-resistant acid phosphatase (TRAP) positive but expression of calcitonin receptor (CTR) was downregulated by more than 30-fold. Constant exposure of M-CSF- and RANKL-treated cells to GM-CSF resulted in inhibition of osteoclast formation and the downregulation of CTSK and TRAP implicating the upregulation of CSF2R in a possible feedback inhibition of osteoclastogenesis.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Day CJ,Kim MS,Stephens SR,Simcock WE,Aitken CJ,Nicholson GC,Morrison NAdoi
10.1002/jcb.10780subject
Has Abstractpub_date
2004-02-01 00:00:00pages
303-15issue
2eissn
0730-2312issn
1097-4644journal_volume
91pub_type
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