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Thioredoxin 1 (TRX1) Overexpression Cancels the Slow Force Response (SFR) Development
The stretch of cardiac muscle increases developed force in two phases. The first phase occurs immediately after stretch and is the expression of the Frank–Starling mechanism, while the second one or slow force response (SFR) occurs gradually and is due to an increase in the calcium transient amplitu...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7952880/ https://www.ncbi.nlm.nih.gov/pubmed/33718450 http://dx.doi.org/10.3389/fcvm.2021.622583 |
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author | Zavala, Maite R. Díaz, Romina G. Villa-Abrille, María C. Pérez, Néstor G. |
author_facet | Zavala, Maite R. Díaz, Romina G. Villa-Abrille, María C. Pérez, Néstor G. |
author_sort | Zavala, Maite R. |
collection | PubMed |
description | The stretch of cardiac muscle increases developed force in two phases. The first phase occurs immediately after stretch and is the expression of the Frank–Starling mechanism, while the second one or slow force response (SFR) occurs gradually and is due to an increase in the calcium transient amplitude. An important step in the chain of events leading to the SFR generation is the increased production of reactive oxygen species (ROS) leading to redox sensitive ERK1/2, p90RSK, and NHE1 phosphorylation/activation. Conversely, suppression of ROS production blunts the SFR. The purpose of this study was to explore whether overexpression of the ubiquitously expressed antioxidant molecule thioredoxin-1 (TRX1) affects the SFR development and NHE1 phosphorylation. We did not detect any change in basal phopho-ERK1/2, phopho-p90RSK, and NHE1 expression in mice with TRX1 overexpression compared to wild type (WT). Isolated papillary muscles from WT or TRX1-overexpressing mice were stretched from 92 to 98% of its maximal length. A prominent SFR was observed in WT mice that was completely canceled in TRX1 animals. Interestingly, myocardial stretch induced a significant increase in NHE1 phosphorylation in WT mice that was not detected in TRX1-overexpressing mice. These novel results suggest that magnification of cardiac antioxidant defense power by overexpression of TRX1 precludes NHE1 phosphorylation/activation after stretch, consequently blunting the SFR development. |
format | Online Article Text |
id | pubmed-7952880 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-79528802021-03-13 Thioredoxin 1 (TRX1) Overexpression Cancels the Slow Force Response (SFR) Development Zavala, Maite R. Díaz, Romina G. Villa-Abrille, María C. Pérez, Néstor G. Front Cardiovasc Med Cardiovascular Medicine The stretch of cardiac muscle increases developed force in two phases. The first phase occurs immediately after stretch and is the expression of the Frank–Starling mechanism, while the second one or slow force response (SFR) occurs gradually and is due to an increase in the calcium transient amplitude. An important step in the chain of events leading to the SFR generation is the increased production of reactive oxygen species (ROS) leading to redox sensitive ERK1/2, p90RSK, and NHE1 phosphorylation/activation. Conversely, suppression of ROS production blunts the SFR. The purpose of this study was to explore whether overexpression of the ubiquitously expressed antioxidant molecule thioredoxin-1 (TRX1) affects the SFR development and NHE1 phosphorylation. We did not detect any change in basal phopho-ERK1/2, phopho-p90RSK, and NHE1 expression in mice with TRX1 overexpression compared to wild type (WT). Isolated papillary muscles from WT or TRX1-overexpressing mice were stretched from 92 to 98% of its maximal length. A prominent SFR was observed in WT mice that was completely canceled in TRX1 animals. Interestingly, myocardial stretch induced a significant increase in NHE1 phosphorylation in WT mice that was not detected in TRX1-overexpressing mice. These novel results suggest that magnification of cardiac antioxidant defense power by overexpression of TRX1 precludes NHE1 phosphorylation/activation after stretch, consequently blunting the SFR development. Frontiers Media S.A. 2021-02-26 /pmc/articles/PMC7952880/ /pubmed/33718450 http://dx.doi.org/10.3389/fcvm.2021.622583 Text en Copyright © 2021 Zavala, Díaz, Villa-Abrille and Pérez. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Cardiovascular Medicine Zavala, Maite R. Díaz, Romina G. Villa-Abrille, María C. Pérez, Néstor G. Thioredoxin 1 (TRX1) Overexpression Cancels the Slow Force Response (SFR) Development |
title | Thioredoxin 1 (TRX1) Overexpression Cancels the Slow Force Response (SFR) Development |
title_full | Thioredoxin 1 (TRX1) Overexpression Cancels the Slow Force Response (SFR) Development |
title_fullStr | Thioredoxin 1 (TRX1) Overexpression Cancels the Slow Force Response (SFR) Development |
title_full_unstemmed | Thioredoxin 1 (TRX1) Overexpression Cancels the Slow Force Response (SFR) Development |
title_short | Thioredoxin 1 (TRX1) Overexpression Cancels the Slow Force Response (SFR) Development |
title_sort | thioredoxin 1 (trx1) overexpression cancels the slow force response (sfr) development |
topic | Cardiovascular Medicine |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7952880/ https://www.ncbi.nlm.nih.gov/pubmed/33718450 http://dx.doi.org/10.3389/fcvm.2021.622583 |
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