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Nature. 2019 May;569(7755):275-279. doi: 10.1038/s41586-019-1126-2. Epub 2019 Apr 17.

LLGL2 rescues nutrient stress by promoting leucine uptake in ER+ breast cancer.

Author information

1
Department of Medicine, Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
2
Department of Pathology, Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
3
Institute for Advanced Biosciences, Keio University, Yamagata, Japan.
4
Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, MA, USA.
5
Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA.
6
Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada.
7
Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.
8
Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute, Boston, MA, USA.
9
Division of Signal Transduction, Department of Medicine, Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
10
Department of Medicine, Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA. smuthusw@bidmc.harvard.edu.
11
Department of Pathology, Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA. smuthusw@bidmc.harvard.edu.

Abstract

Drosophila Lgl and its mammalian homologues, LLGL1 and LLGL2, are scaffolding proteins that regulate the establishment of apical-basal polarity in epithelial cells1,2. Whereas Lgl functions as a tumour suppressor in Drosophila1, the roles of mammalian LLGL1 and LLGL2 in cancer are unclear. The majority (about 75%) of breast cancers express oestrogen receptors (ERs)3, and patients with these tumours receive endocrine treatment4. However, the development of resistance to endocrine therapy and metastatic progression are leading causes of death for patients with ER+ disease4. Here we report that, unlike LLGL1, LLGL2 is overexpressed in ER+ breast cancer and promotes cell proliferation under nutrient stress. LLGL2 regulates cell surface levels of a leucine transporter, SLC7A5, by forming a trimeric complex with SLC7A5 and a regulator of membrane fusion, YKT6, to promote leucine uptake and cell proliferation. The oestrogen receptor targets LLGL2 expression. Resistance to endocrine treatment in breast cancer cells was associated with SLC7A5- and LLGL2-dependent adaption to nutrient stress. SLC7A5 was necessary and sufficient to confer resistance to tamoxifen treatment, identifying SLC7A5 as a potential therapeutic target for overcoming resistance to endocrine treatments in breast cancer. Thus, LLGL2 functions as a promoter of tumour growth and not as a tumour suppressor in ER+ breast cancer. Beyond breast cancer, adaptation to nutrient stress is critically important5, and our findings identify an unexpected role for LLGL2 in this process.

PMID:
30996345
DOI:
10.1038/s41586-019-1126-2

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