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The gram-negative bacterium Bartonella henselae is capable of causing angiogenic lesions as a result of infection. Previously, it has been shown that B. henselae infection can result in production of the chemokine interleukin-8 (IL-8). In this study, we demonstrated that monocytes, endothelial cells, and hepatocytes produce IL-8 in response to B. henselae infection. We also investigated the role of IL-8 in B. henselae-induced endothelial cell proliferation and capillary tube formation. Both in vitro angiogenesis assays were IL-8 dependent. B. henselae-mediated inhibition of apoptosis, as indicated by gene expression of Bax and Bcl-2, was also shown to be IL-8 dependent in endothelial cells. Furthermore, infection of endothelial cells with B. henselae stimulated upregulation of the IL-8 chemokine receptor CXCR2. Infection of human endothelial cells by B. henselae resulting in IL-8 production likely plays a central role in the ability of this organism to cause angiogenesis during infection.

Autocrine Role for Interleukin-8 in Bartonella henselae -Induced Angiogenesis