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. 1993 Sep;61(9):3843–3853. doi: 10.1128/iai.61.9.3843-3853.1993

Borrelia burgdorferi outer surface lipoproteins OspA and OspB possess B-cell mitogenic and cytokine-stimulatory properties.

Y Ma 1, J J Weis 1
PMCID: PMC281085  PMID: 8359905

Abstract

Sonicated Borrelia burgdorferi was previously reported to possess both B-cell mitogenic and interleukin-6 (IL-6) stimulatory activities. In this report, two outer surface lipoproteins, OspA and OspB, were purified from B. burgdorferi and assessed for the presence of these functions. OspA was purified from two strains, an OspB-deficient variant of HB19 and N40, while OspB was purified from the N40 strain. All lipoprotein preparations were free of endotoxin contamination, and polymyxin B failed to inhibit responses, indicating that media contamination was not contributing to biological assays. All three preparations were able to stimulate proliferation of mononuclear cells from naive C3H/HeJ and BALB/c mice. Depletion experiments indicated that the responding cells were B lymphocytes and not T lymphocytes. Purified OspA and OspB stimulated immunoglobulin M production by splenocyte cultures from naive mice, a property also previously attributed to sonicated B. burgdorferi. OspA and OspB also stimulated the production of IL-6 and tumor necrosis factor alpha by bone marrow-derived macrophages from BALB/c and C3H/HeJ mice. Cytokine production was enhanced by the presence of gamma interferon in the cultures, indicating that the magnitude of responses to these lipoproteins may be modulated by cytokines in the microenvironment of infected tissues. Human endothelial cells produced IL-6 when incubated with OspA and OspB, indicating that non-hematopoietic lineage cells can respond to the lipoproteins. Purified OspA and OspB had approximately equal activity, with responses detected in the range of 10 ng of lipoprotein per ml to 1 microgram of lipoprotein per ml. Comparison with published dose responses for lipoproteins purified from Escherichia coli indicates that OspA and OspB purified from B. burgdorferi are much more potent. The high potency of the B. burgdorferi lipoproteins and the ability of the spirochete to invade tissues and persist argue that they could be important in the localized events contributing to the pathology of Lyme disease.

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Selected References

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