Humanization of mouse anti-human IL-8 antibody and development of anti-inflammatory agent against cytokine regulatory factor, NFkB

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IL-8 is essentially involved in neutrophil-dependent tissue damage in acute inflammatory reactions. We established the humanized mouse anti-human IL-8 by mean of complementarity determining region grafting and succeeded to purify the large amount of this antibody. For the application of this antibody on various clinical condition, we established various acute inflammatory ananimal models. Especially, we have established preclinical condition animal models such as acute respiratory distress syndrom-like lung injury and brain reperfusion injury. In these models, we showed that anti-IL-8 antibody treatment almostly prevented these injury. These results strongly suggest the possibility of clinical application of humarized anti-human IL-8 antibody against acute inflammatory dieases.We have identified a kinase in cell extracts from the LPS-stimulated human monocytic cell line, THP-1, that specifically bind and phosphorylates IkBa. LPS-stimulation transiently enhanced the IkBa-bound kinase activity in THP-1 cells. Mutation analysis of IkBa and competition experiments with the synthetic peptides identified major phosphorylation site by the bound kinase as Ser and Thr residues in the C-terminal acidic domain of IkBa. Moreover, this IkBa-boundkinase is novel kinase but not Ikka, b which are related to signal pathway of TNF-a and IL-1. So that we try to purify the kinase SDS-PAGE analysis showed that the kinase. is 40 Kd. We are now analyzing the amino acid squence of the sample and trying to clone the gene.