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Tumor Biology |
Department of Pathology and Laboratory Medicine (D.J.B.) and Laboratory of Molecular Neuro-Oncology, Departments of Neurosurgery and Hematology/Oncology, and Winship Cancer Institute (A.C.B., E.G.V.M.), Emory University School of Medicine, Atlanta, GA 30322, USA
2 Send correspondence to Erwin G. Van Meir, Laboratory of Molecular Neuro-Oncology, Winship Cancer Institute, Emory University School of Medicine, 1365-C Clifton Road NE, Room C-5078, Atlanta, GA 30322, USA (evanmei{at}emory.edu).
Abstract
Interleukin-8 (IL-8, or CXCL8), which is a chemokine with a defining CXC
amino acid motif that was initially characterized for its leukocyte
chemotactic activity, is now known to possess tumorigenic and proangiogenic
properties as well. In human gliomas, IL-8 is expressed and secreted at high
levels both in vitro and in vivo, and recent experiments suggest it is
critical to glial tumor neovascularity and progression. Levels of IL-8
correlate with histologic grade in glial neoplasms, and the most malignant
form, glioblastoma, shows the highest expression in pseudopalisading cells
around necrosis, suggesting that hypoxia/anoxia may stimulate expression. In
addition to hypoxia/anoxia stimulation, increased IL-8 in gliomas occurs in
response to Fas ligation, death receptor activation, cytosolic
Ca2+, TNF-
, IL-1, and other cytokines and various cellular
stresses. The IL-8 promoter contains binding sites for the transcription
factors NF-
B, AP-1, and C-EBP/NF-IL-6, among others. AP-1 has been
shown to mediate IL-8 upregulation by anoxia in gliomas. The potential tumor
suppressor ING4 was recently shown to be a critical regulator of
NF-B-mediated IL-8 transcription and subsequent angiogenesis in
gliomas. The IL-8 receptors that could contribute to IL-8-mediated tumorigenic
and angiogenic responses include CXCR1 and CXCR2, both of which are G-protein
coupled, and the Duffy antigen receptor for cytokines, which has no defined
intracellular signaling capabilities. The proangiogenic activity of IL-8
occurs predominantly following binding to CXCR2, but CXCR1 appears to
contribute as well through independent, small-GTPase activity. A precise
definition of the mechanisms by which IL-8 exerts its proangiogenic functions
requires further study for the development of effective IL-8-targeted
therapies.
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