☆ 4.8 Article

SORLA regulates endosomal trafficking and oncogenic fitness of HER2

NATURE COMMUNICATIONS (2019)

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NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -

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NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-10275-0

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Multidisciplinary Sciences

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  1. Academy of Finland
  2. Academy of Finland CoE for Translational Cancer Research
  3. ERC CoG grant [615258]
  4. Sigrid Juselius Foundation
  5. Orion Research Foundation
  6. Finnish Cancer Organization
  7. Turku Doctoral Program of Molecular Medicine (TuDMM)
  8. Finnish Cultural Foundation

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The human epidermal growth factor receptor 2 (HER2) is an oncogene targeted by several kinase inhibitors and therapeutic antibodies. While the endosomal trafficking of many other receptor tyrosine kinases is known to regulate their oncogenic signalling, the prevailing view on HER2 is that this receptor is predominantly retained on the cell surface. Here, we find that sortilin-related receptor 1 (SORLA; SORL1) co-precipitates with HER2 in cancer cells and regulates HER2 subcellular distribution by promoting recycling of the endosomal receptor back to the plasma membrane. SORLA protein levels in cancer cell lines and bladder cancers correlates with HER2 levels. Depletion of SORLA triggers HER2 targeting to late endosomal/lysosomal compartments and impairs HER2-driven signalling and in vivo tumour growth. SORLA silencing also disrupts normal lysosome function and sensitizes anti-HER2 therapy sensitive and resistant cancer cells to lysosome-targeting cationic amphiphilic drugs. These findings reveal potentially important SORLA-dependent endosomal trafficking-linked vulnerabilities in HER2-driven cancers.

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