Modulation of bcl-xL in tumor cells regulates angiogenesis through CXCL8 expression

Giorgini, Simona; Trisciuoglio, Daniela; Gabellini, Chiara; Desideri, Marianna; Castellini, Laura; Colarossi, Cristina; Zangemeister-Wittke, Uwe; Zupi, Gabriella; Del Bufalo, Donatella (2007). Modulation of bcl-xL in tumor cells regulates angiogenesis through CXCL8 expression. Molecular cancer research, 5(8), pp. 761-71. Philadelphia, Pa.: American Association for Cancer Research AACR 10.1158/1541-7786.MCR-07-0088

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In this paper, we investigated whether bcl-xL can be involved in the modulation of the angiogenic phenotype of human tumor cells. Using the ADF human glioblastoma and the M14 melanoma lines, and their derivative bcl-xL-overexpressing clones, we showed that the conditioned medium of bcl-xL transfectants increased in vitro endothelial cell functions, such as proliferation and morphogenesis, and in vivo vessel formation in Matrigel plugs, compared with the conditioned medium of control cells. Moreover, the overexpression of bcl-xL induced an increased expression of the proangiogenic interleukin-8 (CXCL8), both at the protein and mRNA levels, and an enhanced CXCL8 promoter activity. The role of CXCL8 on bcl-xL-induced angiogenesis was validated using CXCL8-neutralizing antibodies, whereas down-regulation of bcl-xL through antisense oligonucleotide or RNA interference strategies confirmed the involvement of bcl-xL on CXCL8 expression. Transient overexpression of bcl-xL led to extend this observation to other tumor cell lines with different origin, such as colon and prostate carcinoma. In conclusion, our results showed that CXCL8 modulation by bcl-xL regulates tumor angiogenesis, and they point to elucidate an additional function of bcl-xL protein.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Pharmacology
UniBE Contributor:	Zangemeister-Wittke, Uwe
Subjects:	600 Technology > 610 Medicine & health
ISSN:	1541-7786
ISBN:	17699103
Publisher:	American Association for Cancer Research AACR
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 14:54
Last Modified:	05 Dec 2022 14:16
Publisher DOI:	10.1158/1541-7786.MCR-07-0088
PubMed ID:	17699103
Web of Science ID:	000248862100001
URI:	https://boris.unibe.ch/id/eprint/22998 (FactScience: 38520)