title: Influences of Polyactin A on activities of human monocytes in vitro.
abstract: Effects of Polyactin A (PAA) on abilities of human monocytes to synthesize and secrete interleukin-1 (IL-1) and to modulate natural killer (NK) cell activity in large granular lymphocytes (LGL) were investigated in vitro. Over a wide range of concentrations (0.01-100 micrograms.ml-1), PAA directly induced IL-1 synthesis and secretion, showing the maximal effect at 10 micrograms.ml-1, and evidently synergized with lipopolysaccharides (LPS) of E coli in stimulation of IL-1 production by human monocytes. The manifestation of PAA pretreated autologous monocytes in modulation of NK cell activity was closely related to PAA concentration. A boosting effect of PAA-treated monocytes on NK activity was observed when PAA 10-100 micrograms.ml-1 were used for pretreatment of monocytes, while an inhibitory influence of monocytes was found when PAA 0.01-0.1 microgram.ml-1 were used. These results demonstrate significant effects of PAA on functions of human monocytes, enhancing IL-1 production and affecting their regulative activity on NK cell cytotoxicity.
authors.affiliation: Department of Microbiology and Immunology, West China University of Medical Sciences, Chengdu.
authors.forename: Q L
authors.initials: QL
authors.lastname: Hu
authors.forename: H
authors.initials: H
authors.lastname: Wang
authors.forename: Y S
authors.initials: YS
authors.lastname: Wang
authors.forename: R X
authors.initials: RX
authors.lastname: Chen
authors.forename: W M
authors.initials: WM
authors.lastname: Shen
authors.forename: P
authors.initials: P
authors.lastname: Wang
mesh_terms: D000276:Adjuvants, Immunologic / Q000494:pharmacology*; D000328:Adult; D000818:Animals; D003602:Cytotoxicity, Immunologic; D005260:Female; D006020:Glycopeptides / Q000494:pharmacology*; D006801:Humans; D007375:Interleukin-1 / Q000096:biosynthesis*; D007694:Killer Cells, Natural / Q000276:immunology; D004915:Leukemia, Erythroblastic, Acute / Q000276:immunology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009000:Monocytes / Q000378:metabolism* / Q000502:physiology; D014407:Tumor Cells, Cultured
chemical_list: D000276:Adjuvants, Immunologic; D006020:Glycopeptides; D007375:Interleukin-1; C064233:polyactin A