title: Bone-resorbing cytokines enhance release of macrophage colony-stimulating activity by the osteoblastic cell MC3T3-E1.
abstract: It has been observed that bone resorption in response to interleukin 1 (IL 1) or tumor necrosis factor (TNF) is accompanied by an increase in osteoclast number. Because the osteoclast is of hemopoietic lineage, recruitment could be regulated by colony-stimulating factors, one of which may be macrophage colony-stimulating factor (M-CSF). In this study, we show that the constitutive release of M-CSF activity by the osteoblastic cell MC3T3-E1 is enhanced by the presence of recombinant IL 1 alpha, recombinant TNF alpha, or by the concurrent presence of purified transforming growth factor beta (TGF beta) and epidermal growth factor (EGF). Increased release of CSF by the osteoblast in response to these agents may provide a signal for the growth and maturation of osteoclast precursors leading to subsequent bone resorption.
authors.affiliation: Department of Pathophysiology, University of Berne, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Felix
authors.forename: H
authors.initials: H
authors.lastname: Fleisch
authors.forename: P R
authors.initials: PR
authors.lastname: Elford
mesh_terms: D000818:Animals; D001685:Biological Factors / Q000494:pharmacology*; D001862:Bone Resorption / Q000187:drug effects*; D002478:Cells, Cultured; D003115:Colony-Stimulating Factors / Q000378:metabolism*; D016207:Cytokines; D004815:Epidermal Growth Factor / Q000494:pharmacology; D007375:Interleukin-1 / Q000494:pharmacology; D016173:Macrophage Colony-Stimulating Factor; D010006:Osteoblasts / Q000187:drug effects / Q000378:metabolism*; D015291:Transforming Growth Factors / Q000494:pharmacology; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D001685:Biological Factors; D003115:Colony-Stimulating Factors; D016207:Cytokines; D007375:Interleukin-1; D014409:Tumor Necrosis Factor-alpha; D004815:Epidermal Growth Factor; D015291:Transforming Growth Factors; D016173:Macrophage Colony-Stimulating Factor