In vivo Modulation with Anti-Interleukin-1 (IL-1) Receptor (p80) Antibody 35F5 ofthe Response to IL-1. The Relationship of Radioprotection, Colony-Stimulating Factor, and IL-6

摘要

Interleukin-1 (IL-1) is radioprotective and induces both circulating colony-stimulating factor(s) (CSF) and IL-6 in mice. We evaluated the relationship among these three responses to IL-1 using anti-IL 1 receptor antibody 35F5. This antibody in vitro blocks responses of T cells and fibroblasts, but not of B cells or myeloid cell lines, to IL-1. Administration of 35F5 alone before irradiation reduced the number of surviving mice compared with those not treated with 35F5, demonstrating that endogenous IL-1 participates in the natural resistance to radiation. Thirty micrograms of 35F5 per mouse also reduced by 92% the survival of irradiated mice pretreated with 0.3 micrograms of IL01. Similarly, 30 micrograms of 35F5 reduced by 96% to 98% the induction of IL-6 by IL-1. In contrast, 30 micrograms of 35F5 resulted in only moderate reduction of circulating CSF. Consequently, the level of circulating CSF after 35F5 treatment was still equivalent to levels of CSF that were induced by doses of IL-1 in the radioprotective range. Keywords: Reprints (js)