Protection of neonatal rat cardiac myocytes against radiation-induced damage with agonists of growth hormone-releasing hormone

[Display omitted] Despite the great clinical significance of radiation-induced cardiac damage, experimental investigation of its mechanisms is an unmet need in medicine. Beneficial effects of growth hormone-releasing hormone (GHRH) agonists in regeneration of the heart have been demonstrated. The ai...

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Veröffentlicht in:Pharmacological research 2016-09, Vol.111, p.859-866
Hauptverfasser: Kiscsatári, Laura, Varga, Zoltán, Schally, Andrew V., Gáspár, Renáta, Nagy, Csilla Terézia, Giricz, Zoltán, Ferdinandy, Péter, Fábián, Gabriella, Kahán, Zsuzsanna, Görbe, Anikó
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container_start_page 859
container_title Pharmacological research
container_volume 111
creator Kiscsatári, Laura
Varga, Zoltán
Schally, Andrew V.
Gáspár, Renáta
Nagy, Csilla Terézia
Giricz, Zoltán
Ferdinandy, Péter
Fábián, Gabriella
Kahán, Zsuzsanna
Görbe, Anikó
description [Display omitted] Despite the great clinical significance of radiation-induced cardiac damage, experimental investigation of its mechanisms is an unmet need in medicine. Beneficial effects of growth hormone-releasing hormone (GHRH) agonists in regeneration of the heart have been demonstrated. The aim of this study was the evaluation of the potential of modern GHRH agonistic analogs in prevention of radiation damage in an in vitro cardiac myocyte-based model. Cultures of cardiac myocytes isolated from newborn rats (NRVM) were exposed to a radiation dose of 10Gy. The effects of the agonistic analogs, JI-34 and MR-356, of human GHRH on cell viability, proliferation, their mechanism of action and the protein expression of the GHRH/SV1 receptors were studied. JI-34 and MR-356, had no effect on cell viability or proliferation in unirradiated cultures. However, in irradiated cells JI-34 showed protective effects on cell viability at concentrations of 10 and 100nM, and MR-356 at 500nM; but no such protective effect was detected on cell proliferation. Both agonistic analogs decreased radiation-induced ROS level and JI-34 interfered with the activation of SAFE/RISK pathways. Using Western blot analysis, a 52kDa protein isoform of GHRHR was detected in the samples in both irradiated and unirradiated cells. Since GHRH agonistic analogs, JI-34 and MR-356 alleviated radiation-induced damage of cardiac myocytes, they should be tested in vivo as potential protective agents against radiogenic heart damage.
doi_str_mv 10.1016/j.phrs.2016.07.036
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Beneficial effects of growth hormone-releasing hormone (GHRH) agonists in regeneration of the heart have been demonstrated. The aim of this study was the evaluation of the potential of modern GHRH agonistic analogs in prevention of radiation damage in an in vitro cardiac myocyte-based model. Cultures of cardiac myocytes isolated from newborn rats (NRVM) were exposed to a radiation dose of 10Gy. The effects of the agonistic analogs, JI-34 and MR-356, of human GHRH on cell viability, proliferation, their mechanism of action and the protein expression of the GHRH/SV1 receptors were studied. JI-34 and MR-356, had no effect on cell viability or proliferation in unirradiated cultures. However, in irradiated cells JI-34 showed protective effects on cell viability at concentrations of 10 and 100nM, and MR-356 at 500nM; but no such protective effect was detected on cell proliferation. Both agonistic analogs decreased radiation-induced ROS level and JI-34 interfered with the activation of SAFE/RISK pathways. Using Western blot analysis, a 52kDa protein isoform of GHRHR was detected in the samples in both irradiated and unirradiated cells. 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Beneficial effects of growth hormone-releasing hormone (GHRH) agonists in regeneration of the heart have been demonstrated. The aim of this study was the evaluation of the potential of modern GHRH agonistic analogs in prevention of radiation damage in an in vitro cardiac myocyte-based model. Cultures of cardiac myocytes isolated from newborn rats (NRVM) were exposed to a radiation dose of 10Gy. The effects of the agonistic analogs, JI-34 and MR-356, of human GHRH on cell viability, proliferation, their mechanism of action and the protein expression of the GHRH/SV1 receptors were studied. JI-34 and MR-356, had no effect on cell viability or proliferation in unirradiated cultures. However, in irradiated cells JI-34 showed protective effects on cell viability at concentrations of 10 and 100nM, and MR-356 at 500nM; but no such protective effect was detected on cell proliferation. Both agonistic analogs decreased radiation-induced ROS level and JI-34 interfered with the activation of SAFE/RISK pathways. Using Western blot analysis, a 52kDa protein isoform of GHRHR was detected in the samples in both irradiated and unirradiated cells. 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Varga, Zoltán ; Schally, Andrew V. ; Gáspár, Renáta ; Nagy, Csilla Terézia ; Giricz, Zoltán ; Ferdinandy, Péter ; Fábián, Gabriella ; Kahán, Zsuzsanna ; Görbe, Anikó</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c470t-6ba2383ee2ad7c1060916e2f05c3c13834a819031c30a7ef5b7eb5ebb927abbf3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Alprostadil - analogs &amp; derivatives</topic><topic>Alprostadil - pharmacology</topic><topic>Animals</topic><topic>Animals, Newborn</topic><topic>Cardiac myocytes</topic><topic>Cardioprotection</topic><topic>Cardiotoxicity</topic><topic>Cell Proliferation - drug effects</topic><topic>Cell Proliferation - radiation effects</topic><topic>Cell Survival - drug effects</topic><topic>Cell Survival - radiation effects</topic><topic>Cells, Cultured</topic><topic>Cytoprotection</topic><topic>Dose-Response Relationship, Drug</topic><topic>GHRH agonists</topic><topic>GHRH/SV1 receptors</topic><topic>Growth Hormone-Releasing Hormone - agonists</topic><topic>Growth Hormone-Releasing Hormone - analogs &amp; 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Beneficial effects of growth hormone-releasing hormone (GHRH) agonists in regeneration of the heart have been demonstrated. The aim of this study was the evaluation of the potential of modern GHRH agonistic analogs in prevention of radiation damage in an in vitro cardiac myocyte-based model. Cultures of cardiac myocytes isolated from newborn rats (NRVM) were exposed to a radiation dose of 10Gy. The effects of the agonistic analogs, JI-34 and MR-356, of human GHRH on cell viability, proliferation, their mechanism of action and the protein expression of the GHRH/SV1 receptors were studied. JI-34 and MR-356, had no effect on cell viability or proliferation in unirradiated cultures. However, in irradiated cells JI-34 showed protective effects on cell viability at concentrations of 10 and 100nM, and MR-356 at 500nM; but no such protective effect was detected on cell proliferation. Both agonistic analogs decreased radiation-induced ROS level and JI-34 interfered with the activation of SAFE/RISK pathways. Using Western blot analysis, a 52kDa protein isoform of GHRHR was detected in the samples in both irradiated and unirradiated cells. Since GHRH agonistic analogs, JI-34 and MR-356 alleviated radiation-induced damage of cardiac myocytes, they should be tested in vivo as potential protective agents against radiogenic heart damage.</abstract><cop>Netherlands</cop><pub>Elsevier Ltd</pub><pmid>27480202</pmid><doi>10.1016/j.phrs.2016.07.036</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-1680-9256</orcidid><oa>free_for_read</oa></addata></record>
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subjects Alprostadil - analogs & derivatives
Alprostadil - pharmacology
Animals
Animals, Newborn
Cardiac myocytes
Cardioprotection
Cardiotoxicity
Cell Proliferation - drug effects
Cell Proliferation - radiation effects
Cell Survival - drug effects
Cell Survival - radiation effects
Cells, Cultured
Cytoprotection
Dose-Response Relationship, Drug
GHRH agonists
GHRH/SV1 receptors
Growth Hormone-Releasing Hormone - agonists
Growth Hormone-Releasing Hormone - analogs & derivatives
Growth Hormone-Releasing Hormone - metabolism
Growth Hormone-Releasing Hormone - pharmacology
Myocytes, Cardiac - drug effects
Myocytes, Cardiac - metabolism
Myocytes, Cardiac - pathology
Myocytes, Cardiac - radiation effects
Peptide Fragments - pharmacology
Radiation damage
Radiation-Protective Agents - pharmacology
Rats, Wistar
Reactive Oxygen Species - metabolism
Receptors, Neuropeptide - agonists
Receptors, Neuropeptide - metabolism
Receptors, Pituitary Hormone-Regulating Hormone - agonists
Receptors, Pituitary Hormone-Regulating Hormone - metabolism
Signal Transduction - drug effects
Signal Transduction - radiation effects
title Protection of neonatal rat cardiac myocytes against radiation-induced damage with agonists of growth hormone-releasing hormone
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