title: In vivo activation of murine peritoneal B1 cells by the filarial nematode phosphorylcholine-containing glycoprotein ES-62.
abstract: Mice were subcutaneously implanted with osmotic pumps loaded with ES-62, an immunomodulatory phosphorylcholine (PC)-containing glycoprotein secreted by filarial nematodes. The concentration of ES-62 was set to give a serum level within the range found for PC-containing molecules during natural filarial nematode infection of humans. Peritoneal B1 cells were recovered from the mice and the effect of exposure to ES-62 on a number of parameters determined ex vivo. B1 cells exposed to ES-62 showed an increase in spontaneous proliferation that was enhanced by ex vivo exposure to F(ab')(2) fragments of anti-IgM antibodies (anti-IgM), to activate via the antigen receptor, or LPS. Consistent with this, cell-cycle analysis indicated that cells pre-exposed to ES-62 showed increased cell-cycle progression following stimulation with anti-IgM. Pre-exposed cells also showed an increase in both spontaneous and anti-IgM induced IL-10 secretion. Taken together, these data indicate that ES-62 activates murine B1 cells in vivo. Conversely, we have previously shown conventional (B2) B cells to be rendered hypo-responsive by in vivo exposure to ES-62 and the different effect on the two cell types is discussed in relation to the nature of the antibody response arising during filarial nematode infection.
authors.affiliation: Department of Immunology, Strathclyde Institute of Biomedical Sciences, University of Strathclyde, Glasgow, UK.
authors.forename: Emma H
authors.initials: EH
authors.lastname: Wilson
authors.forename: ElaD
authors.initials: E
authors.lastname: Katz
authors.forename: Helen S
authors.initials: HS
authors.lastname: Goodridge
authors.forename: Margaret M
authors.initials: MM
authors.lastname: Harnett
authors.forename: William
authors.initials: W
authors.lastname: Harnett
mesh_terms: D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000378:metabolism; D016175:B-Lymphocyte Subsets / Q000166:cytology / Q000276:immunology*; D002455:Cell Division; D004247:DNA / Q000096:biosynthesis; D006023:Glycoproteins / Q000008:administration & dosage / Q000276:immunology*; D015801:Helminth Proteins / Q000008:administration & dosage / Q000276:immunology* / Q000302:isolation & purification; D016753:Interleukin-10 / Q000096:biosynthesis; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C
chemical_list: D000888:Antibodies, Anti-Idiotypic; C435884:ES-62 protein, Acanthocheilonema viteae; D006023:Glycoproteins; D015801:Helminth Proteins; C044203:anti-IgM; D016753:Interleukin-10; D004247:DNA