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Induction of SGK1 via glucocorticoid-influenced clinical outcome of triple-negative breast cancer patients

  • Preclinical study
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Abstract

Purpose

Triple-negative breast cancer (TNBC) is a highly heterogeneous and aggressive breast malignancy. Glucocorticoid (GC)–glucocorticoid receptor (GR) pathway plays a pivotal role in the cellular responses to various stresses including chemotherapy. Serum- and glucocorticoid-induced kinase-1 (SGK1) is known as an important downstream effector molecule in the GR signaling pathway, we attempted to explore its clinicopathological and functional significance in TNBC in which GR is expressed.

Methods

We first immunolocalized GR and SGK1 and correlated the results with clinicopathological variables and clinical outcome in 131 TNBC patients. We also evaluated the effects of SGK1 on the cell proliferation and migration in TNBC cell lines with administration of dexamethasone (DEX) to further clarify the significance of SGK1.

Results

The status of SGK1 in carcinoma cells was significantly associated with adverse clinical outcome in TNBC patients examined and was significantly associated with lymph node metastasis, pathological stage, and lymphatic invasion of the patients. In particular, SGK1 immunoreactivity was significantly associated with an increased risk of recurrence in GR-positive TNBC patients. Subsequent in vitro studies also demonstrated that DEX promoted TNBC cell migration and the silencing of gene expression did inhibit the cell proliferation and migration of TNBC cells under DEX treatment.

Conclusions

To the best of our knowledge, this is the first study to explore an association between SGK1 and clinicopathological variables and clinical outcome of TNBC patients. SGK1 status was significantly positively correlated with adverse clinical outcome of TNBC patients and promoted carcinoma cell proliferation and migration of carcinoma cells.

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Data Availability

The datasets used and/or analyzed in the present study are available from the corresponding author upon reasonable request.

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Acknowledgements

We thank the members of the Department of Pathology and the Department of Breast and Endocrine Surgical Oncology in Tohoku University Graduate School of Medicine for their support.

Funding

This study was not funded by any grant.

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Correspondence to Yasuhiro Miki.

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The authors declare that they have no conflict of interest.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committees (Tohoku University Hospital: 2020-1-6, Sagara Hospital: 15-2, JCHO Kurume General Hospital: 148) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Zhang, J., Miki, Y., Iwabuchi, E. et al. Induction of SGK1 via glucocorticoid-influenced clinical outcome of triple-negative breast cancer patients. Breast Cancer Res Treat 200, 323–335 (2023). https://doi.org/10.1007/s10549-023-06990-4

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