Beclin 1 Promotes Endosome Recruitment of Hepatocyte Growth Factor Tyrosine Kinase Substrate to Suppress Tumor Proliferation
AuthorsMatthew-Onabanjo, Asia N
Carlisle, Anne E.
Lee, Michael J
Shaw, Leslie M.
UMass Chan AffiliationsProgram in Molecular Medicine
Graduate School of Biomedical Sciences, MD/PhD Program
Program in Systems Biology
Medical Scientist Training Program
Department of Molecular, Cell and Cancer Biology
Document TypeJournal Article
MetadataShow full item record
AbstractBeclin 1 has nonautophagic functions that include its ability to regulate endocytic receptor trafficking. However, the contribution of this function to tumor suppression is poorly understood. Here, we provide in vivo evidence that Beclin 1 suppresses tumor proliferation by regulating the endocytic trafficking and degradation of the EGFR and transferrin (TFR1) receptors. Beclin 1 promoted endosomal recruitment of hepatocyte growth factor tyrosine kinase substrate (HRS), which was necessary for sorting surface receptors to intraluminal vesicles for signal silencing and lysosomal degradation. In tumors with low Beclin 1 expression, endosomal HRS recruitment was diminished and receptor function was sustained. Collectively, our results demonstrate a novel role for Beclin 1 in impeding tumor growth by coordinating the regulation of key growth factor and nutrient receptors. These data provide an explanation for how low levels of Beclin 1 facilitate tumor proliferation and contribute to poor cancer outcomes. SIGNIFICANCE: Beclin 1 controls the trafficking fate of growth regulatory receptors to suppress tumor proliferation.
Cancer Res. 2020 Jan 15;80(2):249-262. doi: 10.1158/0008-5472.CAN-19-1555. Epub 2019 Nov 19. Link to article on publisher's site
Permanent Link to this Itemhttp://hdl.handle.net/20.500.14038/49891