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Bacteria-immunoglobulin-lymphocyte interactions--new aspects

A Forsgren, G Banck, A Grubb

Scandinavian Journal of Infectious Diseases. Supplementum

|January 1, 1980

Summary

Many bacterial species stimulate human lymphocyte DNA synthesis and antibody production, primarily affecting B-cells. Bacterial interactions with immunoglobulin (IgD, IgM) and HLA antigens on B-cells likely mediate this immune response.

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Area of Science:

Immunology
Microbiology

Background:

Bacterial components can activate lymphocytes, but the specific mechanisms and bacterial targets remain incompletely understood.
Lymphocyte activation is crucial for adaptive immunity, involving complex interactions between immune cells and external stimuli.

Purpose of the Study:

To investigate the mitogenic effects of various bacterial species on human lymphocytes.
To identify bacterial structures and host cell surface molecules involved in lymphocyte activation.

Main Methods:

Lymphocyte DNA synthesis assays were performed on human blood lymphocytes exposed to 30 bacterial species.
Plaque assays were used to detect polyclonal antibody production.
Binding assays investigated the interaction of bacterial species with immunoglobulin (IgD, IgM) and HLA antigens.

Main Results:

18 of 30 bacterial species stimulated DNA synthesis and polyclonal antibody production in lymphocytes, primarily B-cells.
Significant binding of IgD and IgM was observed between certain bacteria (e.g., N. catarrhalis, H. influenzae) and lymphocytes.
Bacteria demonstrated binding to HLA-A, -B, and -D antigens, suggesting a role for these molecules in the interaction.

Conclusions:

Certain bacteria possess mitogenic properties that stimulate B-lymphocyte proliferation and polyclonal antibody production.
Bacterial interactions with IgD, IgM, and HLA antigens on the lymphocyte surface are implicated in mediating this immune stimulation.

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