title: Enhancement of murine bone marrow macrophage differentiation by beta-endorphin.
abstract: The present study was performed to investigate the effect of beta-endorphin on macrophage colony-stimulating factor (M-CSF)-induced differentiation of macrophages from bone marrow cells in a semisolid culture system. beta-endorphin increased the number of macrophage colonies when bone marrow cells were cultured in the presence of M-CSF plus lipopolysaccharide (LPS). This was not the case with LPS-unresponsive C3H/HeJ mouse bone marrow cells. alpha-endorphin and gamma-endorphin were as effective as beta-endorphin in enhancing the colony formation. Exogenous interleukin-1 (IL-1), but neither IL-6 nor tumor necrosis factor (TNF), collaborated with beta-endorphin even in the absence of LPS, suggesting that IL-1 is a primary mediator of the effect of LPS. Indeed, anti-IL-1 antibody abolished the collaborative effect of beta-endorphin with LPS. Moreover, IL-1 was effective even for C3H/HeJ mouse bone marrow cells. Naloxone, an antagonist of endorphins for opioid-receptors, completely abrogated the effect of beta-endorphin. In a single-cell culture system, the collaboration between beta-endorphin and IL-1 was revealed by the increase in number and size of macrophage colonies, but collaboration between beta-endorphin and LPS did not occur. These results indicate that, in mixed cell culture, beta-endorphin acts in concert with paracrinal IL-1 induced by LPS to enhance M-CSF-dependent macrophage differentiation from immature precursor cells.
authors.affiliation: Department of Zoology, Faculty of Science, Kyoto University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hagi
authors.forename: K
authors.initials: K
authors.lastname: Inaba
authors.forename: H
authors.initials: H
authors.lastname: Sakuta
authors.forename: S
authors.initials: S
authors.lastname: Muramatsu
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D005260:Female; D006410:Hematopoiesis / Q000187:drug effects*; D066298:In Vitro Techniques; D007375:Interleukin-1 / Q000494:pharmacology; D015850:Interleukin-6 / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D016173:Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D008264:Macrophages / Q000166:cytology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008811:Mice, Inbred DBA; D009270:Naloxone / Q000494:pharmacology; D011957:Receptors, Opioid / Q000502:physiology; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology; D018822:alpha-Endorphin / Q000494:pharmacology; D001615:beta-Endorphin / Q000494:pharmacology*; D018823:gamma-Endorphin / Q000494:pharmacology
chemical_list: D007375:Interleukin-1; D015850:Interleukin-6; D008070:Lipopolysaccharides; D011957:Receptors, Opioid; D014409:Tumor Necrosis Factor-alpha; D009270:Naloxone; D001615:beta-Endorphin; D018822:alpha-Endorphin; D018823:gamma-Endorphin; D016173:Macrophage Colony-Stimulating Factor