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Cancer Res. 2019 Apr 15;79(8):1884-1898. doi: 10.1158/0008-5472.CAN-18-2553. Epub 2019 Feb 14.

MDH1 and MPP7 Regulate Autophagy in Pancreatic Ductal Adenocarcinoma.

Author information

1
Molecular Cell Biology of Autophagy Laboratory, The Francis Crick Institute, London, United Kingdom.
2
Tumour Cell Death Laboratory, Cancer Research UK Beatson Institute, Glasgow, United Kingdom.
3
High Throughput Screening, The Francis Crick Institute, London, United Kingdom.
4
Adult Stem Cell Laboratory, The Francis Crick Institute, London, United Kingdom.
5
Flow Cytometry, The Francis Crick Institute, London, United Kingdom.
6
Korcsmaros Group, Earlham Institute, Norwich, United Kingdom.
7
Korcsmaros Group, Quadram Institute, Norwich, United Kingdom.
8
Department of Chronic Diseases, Metabolism and Ageing, KU Leuven, Belgium.
9
Molecular Cell Biology of Autophagy Laboratory, The Francis Crick Institute, London, United Kingdom. Sharon.tooze@crick.ac.uk.
#
Contributed equally

Abstract

Pancreatic ductal adenocarcinoma (PDAC) is driven by metabolic changes in pancreatic cells caused by oncogenic mutations and dysregulation of p53. PDAC cell lines and PDAC-derived xenografts grow as a result of altered metabolic pathways, changes in stroma, and autophagy. Selective targeting and inhibition of one of these may open avenues for the development of new therapeutic strategies. In this study, we performed a genome-wide siRNA screen in a PDAC cell line using endogenous autophagy as a readout and identified several regulators of autophagy that were required for autophagy-dependent PDAC cell survival. Validation of two promising candidates, MPP7 (MAGUK p55 subfamily member 7, a scaffolding protein involved in cell-cell contacts) and MDH1 (cytosolic Malate dehydrogenase 1), revealed their role in early stages of autophagy during autophagosome formation. MPP7 was involved in the activation of YAP1 (a transcriptional coactivator in the Hippo pathway), which in turn promoted autophagy, whereas MDH1 was required for maintenance of the levels of the essential autophagy initiator serine-threonine kinase ULK1, and increased in the activity upon induction of autophagy. Our results provide a possible explanation for how autophagy is regulated by MPP7 and MDH1, which adds to our understanding of autophagy regulation in PDAC. SIGNIFICANCE: This study identifies and characterizes MPP7 and MDH1 as novel regulators of autophagy, which is thought to be responsible for pancreatic cancer cell survival.

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