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

Inhibition of β1 integrin and IL-3Rβ common subunit interaction hinders tumour angiogenesis.

UBERTI, BARBARA;DENTELLI, Patrizia;ROSSO, Arturo;TROMBETTA, Antonella;TOGLIATTO, Gabriele Maria;OLGASI, CRISTINA;BARALE, CRISTINA;CASTELLI, Ada;DEFILIPPI, Paola;BRIZZI, Maria Felice
2010

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
Associazione di Biologia Cellulare e del Differenziamento: Mechanisms of Signal Trasduction
Fiesole (FI)
26-27 marzo 2010
Associazione di Biologia Cellulare e del Differenziamento: Mechanisms of Signal Trasduction
HIRSCH & ARCANGELI
16
16
b.Uberti; P.Dentelli; A.Rosso; A.Trombetta; G.Togliatto; C.Olgasi; C.Barale; A.Castelli; P.Defilippi; M.F.Brizzi
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/78529
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