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• W1838792204 abstract "Please cite this paper as: Vartanian, Stepanova, Grigorieva, Solomko, Belkin, Baryshnikov, and Lichinitser (2011). Melanoma Vasculogenic Mimicry Capillary-Like Structure Formation Depends on Integrin and Calcium Signaling. Microcirculation. 18(5), 390–399. Objective: We recently demonstrated that the formation of CLSs in vitro, which are thought to be a reconstitution of VM, is controlled by VEGFA. CLS formation also requires the extracellular matrix signals, presumably transduced by integrins. Both pathways are affected by Ca2+. Therefore, we directly tested the roles of Ca2+ and integrin in melanoma VM. Methods: The investigation was performed by immunocytochemical, histochemical, and 3D co-culture assays. We have also used an in vivo animal model. Results: The extracellular and intracellular Ca2+ chelators, EGTA and BAPTA-AM, prevented CLS formation on Matrigel, caused actin rearrangement, and completely destroyed the preformed CLS. Addition of colcemid or cytochalasin D prevented the CLS formation and destroyed the preformed CLS network. Herein, we also show that blocking antibodies to ανβ3 and ανβ5 integrins disrupted the CLS network. Control blocking antibody to β1 integrin had no effect. In vivo experiments indicated that Ca2+ chelation dramatically reduced the signs of VM in melanoma tumors grafted in mice. Conclusions: Our results indicate that the formation of CLS is tightly regulated by extracellular and intracellular Ca2+ levels; ανβ3 and ανβ5 integrins are primarily responsible for CLS formation, whereas β1 integrin does not participate in CLS formation." @default.
• W1838792204 created "2016-06-24" @default.
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• W1838792204 date "2011-07-01" @default.
• W1838792204 modified "2023-09-23" @default.
• W1838792204 title "Melanoma Vasculogenic Mimicry Capillary-Like Structure Formation Depends on Integrin and Calcium Signaling" @default.
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• W1838792204 doi "https://doi.org/10.1111/j.1549-8719.2011.00102.x" @default.
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