American Association for Cancer Research
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Supplementary Figures 1-7 from Pancreatic Stellate Cells Radioprotect Pancreatic Cancer Cells through β1-Integrin Signaling

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posted on 2023-03-30, 20:12 authored by Tine S. Mantoni, Serena Lunardi, Osama Al-Assar, Atsushi Masamune, Thomas B. Brunner
Supplementary Figures 1-7 from Pancreatic Stellate Cells Radioprotect Pancreatic Cancer Cells through β1-Integrin Signaling

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ARTICLE ABSTRACT

Pancreatic ductal adenocarcinoma (PDAC) is characterized by a strong desmoplastic reaction where the stromal compartment often accounts for more than half of the tumor volume. Pancreatic stellate cells (PSC) are a central mediator of desmoplasia. There is increasing evidence that desmoplasia is contributing to the poor therapeutic response of PDAC. We show that PSCs promote radioprotection and stimulate proliferation in pancreatic cancer cells (PCC) in direct coculture. Our in vivo studies show PSC-dependent radioprotection in response to a single dose and to fractionated radiation. Abrogating β1-integrin signaling abolishes the PSC-mediated radioprotection in PCCs. Furthermore, this effect is independent of PI3K (phosphoinositide 3-kinase) but dependent on FAK. Taken together, we show for the first time that PSCs promote radioprotection of PCCs in a β1-integrin–dependent manner. Cancer Res; 71(10); 3453–8. ©2011 AACR.