Glucocorticoids induce ROS/RNS production and DNA damage through an iNOS mediated pathway in breast cancer

Renée L. Flaherty, Matthew Owen, Aidan Fagan-Murphy, Haya Intabli, David Healy, Anika Patel, Marcus Allen, Bhavik Patel, Melanie Flint

Research output: Contribution to journalArticle

Abstract

Background: Psychological stress increases the circulating levels of the stress hormones cortisol and norepinephrine (NE). Chronic exposure to elevated stress hormones has been linked to a reduced response to chemotherapy through induction of DNA damage. We hypothesize that stress hormone signalling may induce DNA damage through the production of ROS/RNS as well as interfering with DNA repair processes, promoting tumourigenesis. Methods: Breast cancer cell lines were incubated with physiological levels of cortisol and norepinephrine (NE) in the presence and absence of receptor antagonists and iNOS inhibitors and DNA damage measured using phosphorylated γ-H2AX. The rate of DNA repair was measured using comet assays and electrochemical sensors were used to detect reactive oxygen/nitrogen species (ROS/RNS) in the cell lysates from cells exposed to stress hormones. A syngeneic mouse model was used to assess the presence of iNOS in mammary tumours of stressed versus control animals and expression of iNOS and GR-associated Src in response to cortisol were examined using western blotting and qRT-PCR. Results: Acute exposure to cortisol and NE significantly increased levels of ROS/RNS and DNA damage and this effect was diminished in the presence of receptor antagonists. Although acute exposure to cortisol did not increase iNOS expression, the production of RNS was attenuated in the presence of an iNOS blocker (1400W). Src dissociates from the glucocorticoid receptor complex after acute cortisol exposure and levels of cortisol induced RNS decrease in response to a Src blocker. Conclusion: These results demonstrate that glucocorticoids may interact with iNOS in a non-genomic manner through the release of Src to produce damaging levels of RNS, thus allowing an insight into the potential mechanisms by which psychological stress may impact breast cancer.
Original languageEnglish
JournalBreast Cancer Research
Volume19
DOIs
Publication statusPublished - 24 Mar 2017

Fingerprint

Glucocorticoids
DNA Damage
Hydrocortisone
Breast Neoplasms
Hormones
Norepinephrine
Psychological Stress
DNA Repair
Reactive Nitrogen Species
Induction Chemotherapy
Comet Assay
Glucocorticoid Receptors
Reactive Oxygen Species
Western Blotting
Cell Line
Polymerase Chain Reaction

Bibliographical note

© The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Keywords

  • Breast cancer
  • Stress
  • Glucocorticoid
  • Norepinephrine
  • iNOS

Cite this

Flaherty, Renée L. ; Owen, Matthew ; Fagan-Murphy, Aidan ; Intabli, Haya ; Healy, David ; Patel, Anika ; Allen, Marcus ; Patel, Bhavik ; Flint, Melanie. / Glucocorticoids induce ROS/RNS production and DNA damage through an iNOS mediated pathway in breast cancer. In: Breast Cancer Research. 2017 ; Vol. 19.
@article{c95f25df6e2549659ffdbd4cfab4f1aa,
title = "Glucocorticoids induce ROS/RNS production and DNA damage through an iNOS mediated pathway in breast cancer",
abstract = "Background: Psychological stress increases the circulating levels of the stress hormones cortisol and norepinephrine (NE). Chronic exposure to elevated stress hormones has been linked to a reduced response to chemotherapy through induction of DNA damage. We hypothesize that stress hormone signalling may induce DNA damage through the production of ROS/RNS as well as interfering with DNA repair processes, promoting tumourigenesis. Methods: Breast cancer cell lines were incubated with physiological levels of cortisol and norepinephrine (NE) in the presence and absence of receptor antagonists and iNOS inhibitors and DNA damage measured using phosphorylated γ-H2AX. The rate of DNA repair was measured using comet assays and electrochemical sensors were used to detect reactive oxygen/nitrogen species (ROS/RNS) in the cell lysates from cells exposed to stress hormones. A syngeneic mouse model was used to assess the presence of iNOS in mammary tumours of stressed versus control animals and expression of iNOS and GR-associated Src in response to cortisol were examined using western blotting and qRT-PCR. Results: Acute exposure to cortisol and NE significantly increased levels of ROS/RNS and DNA damage and this effect was diminished in the presence of receptor antagonists. Although acute exposure to cortisol did not increase iNOS expression, the production of RNS was attenuated in the presence of an iNOS blocker (1400W). Src dissociates from the glucocorticoid receptor complex after acute cortisol exposure and levels of cortisol induced RNS decrease in response to a Src blocker. Conclusion: These results demonstrate that glucocorticoids may interact with iNOS in a non-genomic manner through the release of Src to produce damaging levels of RNS, thus allowing an insight into the potential mechanisms by which psychological stress may impact breast cancer.",
keywords = "Breast cancer, Stress, Glucocorticoid, Norepinephrine, iNOS",
author = "Flaherty, {Ren{\'e}e L.} and Matthew Owen and Aidan Fagan-Murphy and Haya Intabli and David Healy and Anika Patel and Marcus Allen and Bhavik Patel and Melanie Flint",
note = "{\circledC} The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.",
year = "2017",
month = "3",
day = "24",
doi = "10.1186/s13058-017-0823-8",
language = "English",
volume = "19",
journal = "Breast Cancer Research",
issn = "1465-5411",

}

Glucocorticoids induce ROS/RNS production and DNA damage through an iNOS mediated pathway in breast cancer. / Flaherty, Renée L.; Owen, Matthew; Fagan-Murphy, Aidan; Intabli, Haya; Healy, David; Patel, Anika; Allen, Marcus; Patel, Bhavik; Flint, Melanie.

In: Breast Cancer Research, Vol. 19, 24.03.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Glucocorticoids induce ROS/RNS production and DNA damage through an iNOS mediated pathway in breast cancer

AU - Flaherty, Renée L.

AU - Owen, Matthew

AU - Fagan-Murphy, Aidan

AU - Intabli, Haya

AU - Healy, David

AU - Patel, Anika

AU - Allen, Marcus

AU - Patel, Bhavik

AU - Flint, Melanie

N1 - © The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

PY - 2017/3/24

Y1 - 2017/3/24

N2 - Background: Psychological stress increases the circulating levels of the stress hormones cortisol and norepinephrine (NE). Chronic exposure to elevated stress hormones has been linked to a reduced response to chemotherapy through induction of DNA damage. We hypothesize that stress hormone signalling may induce DNA damage through the production of ROS/RNS as well as interfering with DNA repair processes, promoting tumourigenesis. Methods: Breast cancer cell lines were incubated with physiological levels of cortisol and norepinephrine (NE) in the presence and absence of receptor antagonists and iNOS inhibitors and DNA damage measured using phosphorylated γ-H2AX. The rate of DNA repair was measured using comet assays and electrochemical sensors were used to detect reactive oxygen/nitrogen species (ROS/RNS) in the cell lysates from cells exposed to stress hormones. A syngeneic mouse model was used to assess the presence of iNOS in mammary tumours of stressed versus control animals and expression of iNOS and GR-associated Src in response to cortisol were examined using western blotting and qRT-PCR. Results: Acute exposure to cortisol and NE significantly increased levels of ROS/RNS and DNA damage and this effect was diminished in the presence of receptor antagonists. Although acute exposure to cortisol did not increase iNOS expression, the production of RNS was attenuated in the presence of an iNOS blocker (1400W). Src dissociates from the glucocorticoid receptor complex after acute cortisol exposure and levels of cortisol induced RNS decrease in response to a Src blocker. Conclusion: These results demonstrate that glucocorticoids may interact with iNOS in a non-genomic manner through the release of Src to produce damaging levels of RNS, thus allowing an insight into the potential mechanisms by which psychological stress may impact breast cancer.

AB - Background: Psychological stress increases the circulating levels of the stress hormones cortisol and norepinephrine (NE). Chronic exposure to elevated stress hormones has been linked to a reduced response to chemotherapy through induction of DNA damage. We hypothesize that stress hormone signalling may induce DNA damage through the production of ROS/RNS as well as interfering with DNA repair processes, promoting tumourigenesis. Methods: Breast cancer cell lines were incubated with physiological levels of cortisol and norepinephrine (NE) in the presence and absence of receptor antagonists and iNOS inhibitors and DNA damage measured using phosphorylated γ-H2AX. The rate of DNA repair was measured using comet assays and electrochemical sensors were used to detect reactive oxygen/nitrogen species (ROS/RNS) in the cell lysates from cells exposed to stress hormones. A syngeneic mouse model was used to assess the presence of iNOS in mammary tumours of stressed versus control animals and expression of iNOS and GR-associated Src in response to cortisol were examined using western blotting and qRT-PCR. Results: Acute exposure to cortisol and NE significantly increased levels of ROS/RNS and DNA damage and this effect was diminished in the presence of receptor antagonists. Although acute exposure to cortisol did not increase iNOS expression, the production of RNS was attenuated in the presence of an iNOS blocker (1400W). Src dissociates from the glucocorticoid receptor complex after acute cortisol exposure and levels of cortisol induced RNS decrease in response to a Src blocker. Conclusion: These results demonstrate that glucocorticoids may interact with iNOS in a non-genomic manner through the release of Src to produce damaging levels of RNS, thus allowing an insight into the potential mechanisms by which psychological stress may impact breast cancer.

KW - Breast cancer

KW - Stress

KW - Glucocorticoid

KW - Norepinephrine

KW - iNOS

U2 - 10.1186/s13058-017-0823-8

DO - 10.1186/s13058-017-0823-8

M3 - Article

VL - 19

JO - Breast Cancer Research

JF - Breast Cancer Research

SN - 1465-5411

ER -