Abstract
Murine splenic B cells did not constitutively express IL-1 activity. After culture with anti-Ig and T cell-conditioned media and then fixation, B cells expressed membrane IL-1 and were able to stimulate growth of the IL-1-dependent T cell clone D10. Expression of membrane IL-1 required stimulation of B cells for 2 days before fixation. Significant IL-1 activity was detectable in freeze-thaw lysates of identical B cell preparations by 12 h. B cells also released IL-1 into the culture media. In situ hybridization studies by using probes to murine IL-1α and IL-1β genes supported these observations. Thus, messenger RNA for IL-1α and IL-1β rose in parallel, were detected between 6 and 24 h of culture, and declined to low levels by 30 h. Despite the presence of mRNA for IL-1α and IL-1β, only IL-1α had functional activity as determined by the use of a mAb to IL-1α. IL-2 was found to be an essential component of the T cell-derived supernatant. Although IL-4 or TNF did not induce significant B cell IL-1 expression, they both caused a modest, but reproducible enhancement when added in combination with IL-2. IFN-γ, by contrast, partially inhibited IL-1 induction.
Original language | English |
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Pages (from-to) | 3361-3368 |
Number of pages | 8 |
Journal | Journal of Immunology |
Volume | 142 |
Issue number | 10 |
State | Published - 1989 |