IL-32α is the shortest and most abundant of four potential splice variants of the proinflammatory cytokine IL-32 (previously called NK4) with a predicted unmodified size of 15 kDa. Potential modifications include myristoylation and N-glycosylation. The IL-32α shows increased potency at inducing CXCL2/MIP-2 and CXCL8 expression in PBMC relative to uncleaved IL-32α. Transfected IL-32α was more likely to be cellassociated as compared to IL-32β, suggesting an intracellular function. IL-32 is induced by mitogens in peripheral lymphocytes, by IFNγ in epithelial cells, or by IL-12 with IL-18 in NK cells and in turn induces cytokine expression.
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