This gene is a member of the integrin beta chain family and encodes a single-pass type I membrane protein with a VWFA domain and four cysteine-rich repeats. This protein noncovalently binds to an alpha subunit to form a heterodimeric integrin complex. In general, integrin complexes mediate cell-cell and cell-extracellular matrix interactions and this complex plays a role in human airway epithelial proliferation. Alternatively spliced variants which encode different protein isoforms have been described; however, not all variants have been fully characterized.[1] Additionally, it has been shown to interact with RhoGDI1 to alter the activation of Rho GTPases to promote Glioblastoma cell invasiveness. Uncoupling the αvβ8-RhoGDI1 interaction has been seen to block GBM cell invasion by hyperactivating Rho GTPases.[2]
Clinical significance
High expression levels of ITGB8 are associated with high angiogenic and poorly invasiveglioblastoma tumors. Conversely low expression of ITGB8 correlates with highly invasive but low angiogenic tumors.[3]
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Pilewski JM, Latoche JD, Arcasoy SM, Albelda SM (1997). "Expression of integrin cell adhesion receptors during human airway epithelial repair in vivo". Am. J. Physiol. 273 (1 Pt 1): L256–63. PMID9252563.
Cambier S, Mu DZ, O'Connell D, et al. (2001). "A role for the integrin alphavbeta8 in the negative regulation of epithelial cell growth". Cancer Res. 60 (24): 7084–93. PMID11156415.
Jarad G, Wang B, Khan S, et al. (2003). "Fas activation induces renal tubular epithelial cell beta 8 integrin expression and function in the absence of apoptosis". J. Biol. Chem. 277 (49): 47826–33. doi:10.1074/jbc.M204901200. PMID12324452.
Hillier LW, Fulton RS, Fulton LA, et al. (2003). "The DNA sequence of human chromosome 7". Nature. 424 (6945): 157–64. doi:10.1038/nature01782. PMID12853948.
Rual JF, Venkatesan K, Hao T, et al. (2005). "Towards a proteome-scale map of the human protein-protein interaction network". Nature. 437 (7062): 1173–8. doi:10.1038/nature04209. PMID16189514.
Yan W, Shao R (2006). "Transduction of a mesenchyme-specific gene periostin into 293T cells induces cell invasive activity through epithelial-mesenchymal transformation". J. Biol. Chem. 281 (28): 19700–8. doi:10.1074/jbc.M601856200. PMID16702213.
