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- Title
Inhibition of β1 integrin and IL-3Rβ common subunit interaction hinders tumour angiogenesis.
- Authors
Uberti, B; Dentelli, P; Rosso, A; Defilippi, P; Brizzi, M F
- Abstract
Integrin/cytokine receptor interaction provides permissive signals leading to neoangiogenesis, and integrins are crucial for differentiation of endothelial progenitor cells (EPCs). It is known that the inflammatory interleukin-3 (IL-3), released in the tumoral microenvironment, contributes to both angiogenesis and vasculogenic processes. Herein, we generated IL-3 receptor beta common (IL-3Rβc) extracellular domain-derived fusion proteins (Fc) to elucidate the molecular mechanisms regulating these processes. Three different Fc were generated, containing the entire extracellular domain of IL-3Rβc (Fc1.4), a fragment corresponding to domains 1-3 (Fc1.3) and a fragment corresponding to domain 4 (Fc4), respectively. The ability of the fusion proteins to interfere with IL-3Rβc/β1 integrin interaction was assessed on endothelial cells (ECs), EPCs and murine-derived ECs. Pull-down experiments showed that Fc1.4 and Fc4 fusion proteins specifically interacted with β1 integrin. Fc4 and Fc1.4 fragments prevented IL-3-mediated EPC expansion, arterial morphogenesis and tumour-derived EC migration, without affecting cell adhesion. Fc4 in vivo inhibited the IL-3-mediated vasculogenic process, as well as inflammatory and tumour vascular growth. In conclusion, these data identify the β1 integrin-interacting domain in the juxta-membrane IL-3Rβc extracellular domain, and provide the rational for targeting this interaction to impair vascular growth.
- Subjects
INTEGRINS; INTERLEUKIN-3; TUMORS; NEOVASCULARIZATION; CYTOKINES; MOLECULAR dynamics; BIOLOGICAL membranes
- Publication
Oncogene, 2010, Vol 29, Issue 50, p6581
- ISSN
0950-9232
- Publication type
Article
- DOI
10.1038/onc.2010.384