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Excessive Accumulation of Intracellular Ca(2+) After Acute Exercise Potentiated Impairment of T-cell Function

Ca(2+) is an important intracellular second messenger known to regulate several cellular functions. This research aimed to investigate the mechanisms of exercise-induced immunosuppression by measuring intracellular calcium levels, Ca(2+)-regulating gene expression, and agonist-evoked proliferation o...

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Autores principales: Liu, Renyi, Krüger, Karsten, Pilat, Christian, Fan, Wei, Xiao, Yu, Seimetz, Michael, Ringseis, Robert, Baumgart-Vogt, Eveline, Eder, Klaus, Weissmann, Norbert, Mooren, Frank Christoph
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8662941/
https://www.ncbi.nlm.nih.gov/pubmed/34899372
http://dx.doi.org/10.3389/fphys.2021.728625
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author Liu, Renyi
Krüger, Karsten
Pilat, Christian
Fan, Wei
Xiao, Yu
Seimetz, Michael
Ringseis, Robert
Baumgart-Vogt, Eveline
Eder, Klaus
Weissmann, Norbert
Mooren, Frank Christoph
author_facet Liu, Renyi
Krüger, Karsten
Pilat, Christian
Fan, Wei
Xiao, Yu
Seimetz, Michael
Ringseis, Robert
Baumgart-Vogt, Eveline
Eder, Klaus
Weissmann, Norbert
Mooren, Frank Christoph
author_sort Liu, Renyi
collection PubMed
description Ca(2+) is an important intracellular second messenger known to regulate several cellular functions. This research aimed to investigate the mechanisms of exercise-induced immunosuppression by measuring intracellular calcium levels, Ca(2+)-regulating gene expression, and agonist-evoked proliferation of murine splenic T lymphocytes. Mice were randomly assigned to the control, sedentary group (C), and three experimental groups, which performed a single bout of intensive and exhaustive treadmill exercise. Murine splenic lymphocytes were separated by density-gradient centrifugation immediately (E0), 3h (E3), and 24h after exercise (E24). Fura-2/AM was used to monitor cytoplasmic free Ca(2+) concentration in living cells. The combined method of carboxyfluorescein diacetate succinimidyl ester (CFSE) labeling and flow cytometry was used for the detection of T cell proliferation. The transcriptional level of Ca(2+)-regulating genes was quantified by using qPCR. Both basal intracellular Ca(2+) levels and agonist (ConA, OKT3, or thapsigargin)-induced Ca(2+) transients were significantly elevated at E3 group (p<0.05 vs. control). However, mitogen-induced cell proliferation was significantly decreased at E3 group (p<0.05 vs. control). In parallel, the transcriptional level of plasma membrane Ca(2+)-ATPases (PMCA), sarco/endoplasmic reticulum Ca(2+)-ATPases (SERCA), TRPC1, and P2X7 was significantly downregulated, and the transcriptional level of IP(3)R2 and RyR2 was significantly upregulated in E3 (p<0.01 vs. control). In summary, this study demonstrated that acute exercise affected intracellular calcium homeostasis, most likely by enhancing transmembrane Ca(2+) influx into cells and by reducing expression of Ca(2+)-ATPases such as PMCA and SERCA. However, altered Ca(2+) signals were not transduced into an enhanced T cell proliferation suggesting other pathways to be responsible for the transient exercise-associated immunosuppression.
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spelling pubmed-86629412021-12-11 Excessive Accumulation of Intracellular Ca(2+) After Acute Exercise Potentiated Impairment of T-cell Function Liu, Renyi Krüger, Karsten Pilat, Christian Fan, Wei Xiao, Yu Seimetz, Michael Ringseis, Robert Baumgart-Vogt, Eveline Eder, Klaus Weissmann, Norbert Mooren, Frank Christoph Front Physiol Physiology Ca(2+) is an important intracellular second messenger known to regulate several cellular functions. This research aimed to investigate the mechanisms of exercise-induced immunosuppression by measuring intracellular calcium levels, Ca(2+)-regulating gene expression, and agonist-evoked proliferation of murine splenic T lymphocytes. Mice were randomly assigned to the control, sedentary group (C), and three experimental groups, which performed a single bout of intensive and exhaustive treadmill exercise. Murine splenic lymphocytes were separated by density-gradient centrifugation immediately (E0), 3h (E3), and 24h after exercise (E24). Fura-2/AM was used to monitor cytoplasmic free Ca(2+) concentration in living cells. The combined method of carboxyfluorescein diacetate succinimidyl ester (CFSE) labeling and flow cytometry was used for the detection of T cell proliferation. The transcriptional level of Ca(2+)-regulating genes was quantified by using qPCR. Both basal intracellular Ca(2+) levels and agonist (ConA, OKT3, or thapsigargin)-induced Ca(2+) transients were significantly elevated at E3 group (p<0.05 vs. control). However, mitogen-induced cell proliferation was significantly decreased at E3 group (p<0.05 vs. control). In parallel, the transcriptional level of plasma membrane Ca(2+)-ATPases (PMCA), sarco/endoplasmic reticulum Ca(2+)-ATPases (SERCA), TRPC1, and P2X7 was significantly downregulated, and the transcriptional level of IP(3)R2 and RyR2 was significantly upregulated in E3 (p<0.01 vs. control). In summary, this study demonstrated that acute exercise affected intracellular calcium homeostasis, most likely by enhancing transmembrane Ca(2+) influx into cells and by reducing expression of Ca(2+)-ATPases such as PMCA and SERCA. However, altered Ca(2+) signals were not transduced into an enhanced T cell proliferation suggesting other pathways to be responsible for the transient exercise-associated immunosuppression. Frontiers Media S.A. 2021-11-26 /pmc/articles/PMC8662941/ /pubmed/34899372 http://dx.doi.org/10.3389/fphys.2021.728625 Text en Copyright © 2021 Liu, Krüger, Pilat, Fan, Xiao, Seimetz, Ringseis, Baumgart-Vogt, Eder, Weissmann and Mooren. https://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 Physiology
Liu, Renyi
Krüger, Karsten
Pilat, Christian
Fan, Wei
Xiao, Yu
Seimetz, Michael
Ringseis, Robert
Baumgart-Vogt, Eveline
Eder, Klaus
Weissmann, Norbert
Mooren, Frank Christoph
Excessive Accumulation of Intracellular Ca(2+) After Acute Exercise Potentiated Impairment of T-cell Function
title Excessive Accumulation of Intracellular Ca(2+) After Acute Exercise Potentiated Impairment of T-cell Function
title_full Excessive Accumulation of Intracellular Ca(2+) After Acute Exercise Potentiated Impairment of T-cell Function
title_fullStr Excessive Accumulation of Intracellular Ca(2+) After Acute Exercise Potentiated Impairment of T-cell Function
title_full_unstemmed Excessive Accumulation of Intracellular Ca(2+) After Acute Exercise Potentiated Impairment of T-cell Function
title_short Excessive Accumulation of Intracellular Ca(2+) After Acute Exercise Potentiated Impairment of T-cell Function
title_sort excessive accumulation of intracellular ca(2+) after acute exercise potentiated impairment of t-cell function
topic Physiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8662941/
https://www.ncbi.nlm.nih.gov/pubmed/34899372
http://dx.doi.org/10.3389/fphys.2021.728625
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