Human B cells and macrophages cooperate in T-cell-independent type 2 response.

Abstract:

:We have analysed separately the role of B-cell receptor (BCR) stimulation and the soluble second signal in the T-cell-independent type 2 (TI-2) B-cell response. We were able to show that human B cells and macrophages (Mphi) could function together in TI-type microbial response. Interestingly, BCR cross-linking of peripheral blood (PB) B cells enhanced IgG production induced by Mphi-derived growth factors whereas interleukin (IL)-12 + IL-18 had milder effect on IgG production. We demonstrated that B-cell-derived soluble mediators primed lipopolysaccharide (LPS)-stimulated Mphi for tumour necrosis factor-alpha (TNF-alpha) and IL-6 production significantly better than IFN-gamma, confirming the role of B cells in the activation of Mphi. We could show that human PB B cells were active cytokine producers and could be induced to produce interferon (IFN)-gamma mRNA in the presence of known Mphi cytokines, like IL-12 and IL-18. BCR stimulation also stabilized and enhanced the IFN-gamma mRNA production induced by IL-12 and IL-18. In addition, our novel finding was that a known Mphi cytokine, IL-10, induced the expression of IFN-gamma mRNA from human B-cell line (HF28R0) cells. In summary, we propose a model for the active role of B cells in the induction of the inflammatory response during TI antigen challenge in close collaboration with Mphi.

journal_name

Scand J Immunol

authors

Mättö M,Raunio AR,Postila V,Huttunen K,Hirvonen MR,Pelkonen J

doi

10.1111/j.1365-3083.2007.02057.x

subject

Has Abstract

pub_date

2008-03-01 00:00:00

pages

209-17

issue

3

eissn

0300-9475

issn

1365-3083

pii

SJI2057

journal_volume

67

pub_type

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