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Role of PARP1 regulation in radiation-induced rescue effect

Radiation-induced rescue effect (RIRE) in cells refers to the phenomenon where irradiated cells (IRCs) receive help from feedback signals produced by partnered bystander unirradiated cells (UIRCs) or from the conditioned medium (CM) that has previously conditioned the UIRCs. In the present work, we...

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Autores principales: Pathikonda, Spoorthy, Cheng, Shuk Han, Yu, Kwan Ngok
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7299272/
https://www.ncbi.nlm.nih.gov/pubmed/32329510
http://dx.doi.org/10.1093/jrr/rraa023
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author Pathikonda, Spoorthy
Cheng, Shuk Han
Yu, Kwan Ngok
author_facet Pathikonda, Spoorthy
Cheng, Shuk Han
Yu, Kwan Ngok
author_sort Pathikonda, Spoorthy
collection PubMed
description Radiation-induced rescue effect (RIRE) in cells refers to the phenomenon where irradiated cells (IRCs) receive help from feedback signals produced by partnered bystander unirradiated cells (UIRCs) or from the conditioned medium (CM) that has previously conditioned the UIRCs. In the present work, we explored the role of poly (ADP-ribose) polymerase 1 (PARP1) regulation in RIRE and the positive feedback loop between PARP1 and nuclear factor-kappa-light-chain-enhancer of activated B cell (NF-κB) in RIRE using various cell lines, including HeLa, MCF7, CNE-2 and HCT116 cells. We first found that when the IRCs (irradiated with 2 Gy X-ray) were treated with CM, the relative mRNA expression levels of both tumor suppressor p53-binding protein 1 (53BP1) and PARP1, the co-localization factor between 53BP1 and γH2AX as well as the fluorescent intensity of PARP1 were reduced. We also found that IRCs treated with the PARP1 inhibitor, Olaparib (AZD2281) had a higher 53BP1 expression. These results illustrated that PARP1 was involved in RIRE transcriptionally and translationally. We further revealed that treatment of IRCs with CM together with Olaparib led to significantly lower mRNA expression levels and fluorescent intensities of NF-κB, while treatment of IRCs with CM together the NF-κB inhibitor BAY-11-7082 led to significantly lower mRNA expression levels as well as fluorescent intensities of PARP1. These results illustrated that PARP1 and NF-κB were involved in the positive feedback loop transcriptionally and translationally. Thus, the results supported the occurrence of a PARP1–NF-κB positive feedback loop in RIRE. The present work provided insights into potential exploitation of inhibition of PARP1 and/or the PARP1–NF-κB positive feedback loop in designing adjuncts to cancer radiotherapeutics.
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spelling pubmed-72992722020-06-23 Role of PARP1 regulation in radiation-induced rescue effect Pathikonda, Spoorthy Cheng, Shuk Han Yu, Kwan Ngok J Radiat Res Regular Paper Radiation-induced rescue effect (RIRE) in cells refers to the phenomenon where irradiated cells (IRCs) receive help from feedback signals produced by partnered bystander unirradiated cells (UIRCs) or from the conditioned medium (CM) that has previously conditioned the UIRCs. In the present work, we explored the role of poly (ADP-ribose) polymerase 1 (PARP1) regulation in RIRE and the positive feedback loop between PARP1 and nuclear factor-kappa-light-chain-enhancer of activated B cell (NF-κB) in RIRE using various cell lines, including HeLa, MCF7, CNE-2 and HCT116 cells. We first found that when the IRCs (irradiated with 2 Gy X-ray) were treated with CM, the relative mRNA expression levels of both tumor suppressor p53-binding protein 1 (53BP1) and PARP1, the co-localization factor between 53BP1 and γH2AX as well as the fluorescent intensity of PARP1 were reduced. We also found that IRCs treated with the PARP1 inhibitor, Olaparib (AZD2281) had a higher 53BP1 expression. These results illustrated that PARP1 was involved in RIRE transcriptionally and translationally. We further revealed that treatment of IRCs with CM together with Olaparib led to significantly lower mRNA expression levels and fluorescent intensities of NF-κB, while treatment of IRCs with CM together the NF-κB inhibitor BAY-11-7082 led to significantly lower mRNA expression levels as well as fluorescent intensities of PARP1. These results illustrated that PARP1 and NF-κB were involved in the positive feedback loop transcriptionally and translationally. Thus, the results supported the occurrence of a PARP1–NF-κB positive feedback loop in RIRE. The present work provided insights into potential exploitation of inhibition of PARP1 and/or the PARP1–NF-κB positive feedback loop in designing adjuncts to cancer radiotherapeutics. Oxford University Press 2020-04-24 /pmc/articles/PMC7299272/ /pubmed/32329510 http://dx.doi.org/10.1093/jrr/rraa023 Text en © The Author(s) 2020. Published by Oxford University Press on behalf of The Japanese Radiation Research Society and Japanese Society for Radiation Oncology. http://creativecommons.org/licenses/by-nc/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
spellingShingle Regular Paper
Pathikonda, Spoorthy
Cheng, Shuk Han
Yu, Kwan Ngok
Role of PARP1 regulation in radiation-induced rescue effect
title Role of PARP1 regulation in radiation-induced rescue effect
title_full Role of PARP1 regulation in radiation-induced rescue effect
title_fullStr Role of PARP1 regulation in radiation-induced rescue effect
title_full_unstemmed Role of PARP1 regulation in radiation-induced rescue effect
title_short Role of PARP1 regulation in radiation-induced rescue effect
title_sort role of parp1 regulation in radiation-induced rescue effect
topic Regular Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7299272/
https://www.ncbi.nlm.nih.gov/pubmed/32329510
http://dx.doi.org/10.1093/jrr/rraa023
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