Interleukin 4 inhibits the proliferation but not the differentiation of activated human B cells in response to interleukin 2

doi:10.1084/jem.168.4.1321

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Interleukin 4 inhibits the proliferation but not the differentiation of activated human B cells in response to interleukin 2

T Defrance, B Vanbervliet, JP Aubry and J Banchereau
UNICET, Laboratory for Immunological Research, Dardilly, France.

The combined effect of IL-4 and IL-2 on proliferation of anti-IgM antibody or Staphylococcus aureus strain Cowan I (SAC)-preactivated B cells was investigated. It was observed that in most cases, rIL-2 used at optimal concentration induced higher levels of tritiated thymidine ([3H]TdR) uptake than rIL-4 used at optimal concentration. When rIL-4 and rIL-2 were added together, it was repeatedly found that B cell proliferation induced by rIL-2 was significantly reduced and was, in most cases, comparable with the proliferation induced by rIL-4 alone. Cell cycle studies demonstrated that rIL-4 significantly reduced the number of cells entering S and G2/M phases of the cell cycle upon rIL-2 stimulation. B cell blasts preincubated for 24 or 48 h with rIL-4 displayed a reduced proliferation in response to rIL-2. In contrast, preculture of resting B cells with rIL-4 did not impair their subsequent proliferation in response to rIL-2 plus insolubilized anti- IgM antibody. This suggests that rIL-4 can only exert its inhibitory effect once B cells have received an activation signal. The differentiative activity of rIL-2 measured on B cell blasts preactivated for 2 d with SAC was not altered by rIL-4, which suggests that rIL-4 did not exert its inhibitory activity on rIL-2-induced B cell proliferation by enhancing rIL-2-mediated differentiation. Delayed addition of a neutralizing anti-IL-4 antiserum demonstrated that a period of contact of at least 24 h between IL-4 and B cell blasts was necessary for the development of the antagonistic effect of IL-4 on IL- 2-mediated growth of activated B cells. These data demonstrate that IL- 4 antagonizes the B cell growth-promoting effect of IL-2 without affecting the differentiation of preactivated B cells in response to IL- 2.
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