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IL-8, also known as chemokine CXCL8, is a cytokine secreted by macrophages and epithelial cells. IL-8 binds to interleukin-8 receptor α（IL8RA, also called CXCR1） and interleukin-8 receptor β（IL8RB, also known as CXCR2）, resulting in cytochemotaxis neutrophils to regulate inflammatory responses. IL-8 also has a strong pro-angiogenesis effect.IL-8 is almost undetectable under physiological conditions, but under inflammatory conditions, IL-8 levels are rapidly increased by TNF-α, IL-1β and other effects. IL-8 binds to CXCR1 and CXCR2 to promote tumor growth, progression, metastasis and drug resistance through a series of mechanisms. IL-8 plays an important role in the pathogenesis of bronchitis and cystic fibrosis. This product is the recombinant human IL-8 protein expressed from human 293 cells （HEK293）.