Interleukin-4 enhances anti-IgM stimulation of B cells by improving cell viability and by increasing the sensitivity of B cells to the anti-IgM signal.

Abstract:

:The lymphokine IL-4 is a potent enhancer of anti-IgM-induced B cell proliferation. Although the mechanism of this enhancement is not known, a commonly held view suggests that IL-4 acts together with anti-IgM as a costimulating factor for the activation of a subpopulation of B cells. To evaluate this hypothesis we examined the effect of IL-4 on the proportion of B cells stimulated to divide by different doses of anti-IgM using flow cytometry in combination with measurements of tritiated-thymidine incorporation. The results suggest a novel and surprisingly simple model for the mode of action of IL-4. Our analysis revealed that at high saturating anti-IgM concentrations, the proportion of live B cells which enter into S phase of the cell cycle is the same (approximately 65%) for cells cultured with or without IL-4. Cultures containing IL-4, however, exhibit a twofold increase in thymidine uptake over cultures without IL-4. This increase can be explained completely by the ability of IL-4 to enhance the viability of small dense B cells over the first 24 hr from approximately 50 to 90% of the starting cell number. Normalizing the maximum response levels obtained with and without IL-4 reveals that B cells incubated with IL-4 exhibit a 10-fold decrease in the concentration of anti-IgM required to stimulate the half-maximum proliferation level. Furthermore, evaluation of the number of cells in S phase by flow cytometry and analysis of the kinetics of cell proliferation revealed that the increased response effected by IL-4 at lower anti-IgM concentrations was due to a greater number of proliferating B cells rather than the same number of cells undergoing a faster division rate. We also found a highly nonlinear relationship between B cell number and proliferative response, implying a requirement for an additional, cell cooperation-mediated, activating signal for maximum B cell proliferation. IL-4 enhanced proliferation by the same proportion at all cell concentrations indicating that it does not replace or alter this requirement for cell cooperation. Taken together these results suggest that anti-IgM in combination with a second unidentified cell-cooperation-dependent signal leads to proliferation of up to 65% of small resting B cells. IL-4 does not provide an essential activation signal but serves to raise the sensitivity of B cells to the anti-IgM-generated signal.(ABSTRACT TRUNCATED AT 400 WORDS)

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Hodgkin PD,Go NF,Cupp JE,Howard M

doi

10.1016/0008-8749(91)90327-8

subject

Has Abstract

pub_date

1991-04-15 00:00:00

pages

14-30

issue

1

eissn

0008-8749

issn

1090-2163

pii

0008-8749(91)90327-8

journal_volume

134

pub_type

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