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Intravital imaging to monitor therapeutic response in moving hypoxic regions resistant to PI3K pathway targeting in pancreatic cancer

Abstract

Application of advanced intravital imaging facilitates dynamic monitoring of pathway activity upon therapeutic inhibition. Here, we assess resistance to therapeutic inhibition of the PI3K pathway within the hypoxic microenvironment of pancreatic ductal adenocarcinoma (PDAC) and identify a phenomenon whereby pronounced hypoxia-induced resistance is observed for three clinically relevant inhibitors. To address this clinical problem, we have mapped tumor hypoxia by both immunofluorescence and phosphorescence lifetime imaging of oxygen-sensitive nanoparticles and demonstrate that these hypoxic regions move transiently around the tumor. To overlay this microenvironmental information with drug response, we applied a FRET biosensor for Akt activity, which is a key effector of the PI3K pathway. Performing dual intravital imaging of drug response in different tumor compartments, we demonstrate an improved drug response to a combination therapy using the dual mTORC1/2 inhibitor AZD2014 with the hypoxia-activated pro-drug TH-302.

Type Journal
Authors Conway, J. R. W.; Warren, S. C.; Herrmann, D.; Murphy, K. J.; Cazet, A. S.; Vennin, C.; Shearer, R. F.; Killen, M. J.; Magenau, A.; Melenec, P.; Pinese, M.; Nobis, M.; Zaratzian, A.; Boulghourjian, A.; Da Silva, A. M.; Del Monte-Nieto, G.; Adam, A. S. A.; Harvey, R. P.; Haigh, J. J.; Wang, Y.; Croucher, D. R.; Sansom, O. J.; Pajic, M.; Caldon, C. E.; Morton, J. P.; Timpson, P.
Responsible Garvan Author A/Prof Paul Timpson
Publisher Name Cell Reports
Published Date 2018-06-12
Published Volume 23
Published Issue 11
Published Pages 3312-3326
Status Published in-print
DOI 10.1016/j.celrep.2018.05.038
URL link to publisher's version https://www.ncbi.nlm.nih.gov/pubmed/?term=10.1016%2Fj.celrep.2018.05.038
OpenAccess link to author's accepted manuscript version https://publications.gimr.garvan.org.au/open-access/14641