B cell growth-promoting activity of recombinant human interleukin 4 - PubMed (original) (raw)
. 1987 Aug 15;139(4):1135-41.
- PMID: 3112225
B cell growth-promoting activity of recombinant human interleukin 4
T Defrance et al. J Immunol. 1987.
Abstract
Human interleukin 4 (IL-4), also known as B cell stimulatory factor 1, is a T cell-derived glycoprotein consisting of 129 amino acids for which a cDNA has been recently isolated. IL-4 displays little or no B cell growth factor (BCGF) activity in the standard anti-IgM costimulatory assay using suboptimal concentrations of soluble anti-IgM antibody whereas the low m.w. BCGF is very active. When insolubilized anti-IgM was used as the costimulating agent, both IL-4 and the low m.w. BCGF were found to promote B cell proliferation. Human IL-4 is able to induce the proliferation of B lymphocytes preactivated for either 1 day with insolubilized anti-IgM antibody or for 3 days with Staphylococcus aureus strain Cowan I. However, IL-4 is poorly mitogenic for B cells preactivated for 1 day with the Staphylococcus strain whereas the low m.w. BCGF strongly enhances the proliferation of these B cells. These two findings demonstrate that the preactivation signal necessary to induce human B cells to proliferate in response to IL-4 is critical. The increased tritiated thymidine ([3H]dThd) uptake in preactivated B cell cultures with IL-4 reflects cel proliferation because cell cycle analysis demonstrates that IL-4 induces activated B cells to enter the S and G2/M phases of the cell cycle and the addition of IL-4 to preactivated B cell cultures permits the recovery of three- to fourfold more B cells after 4 days of culture. IL-4 and the low m.w. BCGF act in concert to induce the proliferation of anti-IgM-preactivated B cells as demonstrated by [3H]dThd uptake and cell cycle analysis. In striking contrast to the demonstrated antagonistic effect of interferon-gamma on the IL-4-induced expression of the low affinity receptor for IgE (Fc epsilon RL/CD23), on B cells, it was found that interferon-gamma enhanced the IL-4-induced proliferation of anti-IgM-preactivated B cells. Finally, it was found that IL-4 had to be present continuously during the culture period to exert an optimal growth-promoting effect on B cell blasts. As a conclusion, IL-4 is able to induce the proliferation of an appropriately activated subpopulation of human B cells.
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