Loss of glutathione homeostasis associated with neuronal senescence facilitates TRPM2 channel activation in cultured hippocampal pyramidal neurons
<p>Abstract</p> <p>Background</p> <p>Glutathione (GSH) plays an important role in neuronal oxidant defence. Depletion of cellular GSH is observed in neurodegenerative diseases and thereby contributes to the associated oxidative stress and Ca<sup>2+ </sup>dys...
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doaj-63fea7a0d7364c5e891304d6b552febe2020-11-25T00:15:10ZengBMCMolecular Brain1756-66062012-04-01511110.1186/1756-6606-5-11Loss of glutathione homeostasis associated with neuronal senescence facilitates TRPM2 channel activation in cultured hippocampal pyramidal neuronsBelrose Jillian CXie Yu-FengGierszewski Lynn JMacDonald John FJackson Michael F<p>Abstract</p> <p>Background</p> <p>Glutathione (GSH) plays an important role in neuronal oxidant defence. Depletion of cellular GSH is observed in neurodegenerative diseases and thereby contributes to the associated oxidative stress and Ca<sup>2+ </sup>dysregulation. Whether depletion of cellular GSH, associated with neuronal senescence, directly influences Ca<sup>2+ </sup>permeation pathways is not known. Transient receptor potential melastatin type 2 (TRPM2) is a Ca<sup>2+ </sup>permeable non-selective cation channel expressed in several cell types including hippocampal pyramidal neurons. Moreover, activation of TRPM2 during oxidative stress has been linked to cell death. Importantly, GSH has been reported to inhibit TRPM2 channels, suggesting they may directly contribute to Ca<sup>2+ </sup>dysregulation associated with neuronal senescence. Herein, we explore the relation between cellular GSH and TRPM2 channel activity in long-term cultures of hippocampal neurons.</p> <p>Results</p> <p>In whole-cell voltage-clamp recordings, we observe that TRPM2 current density increases in cultured pyramidal neurons over time in vitro. The observed increase in current density was prevented by treatment with NAC, a precursor to GSH synthesis. Conversely, treatment of cultures maintained for 2 weeks in vitro with L-BSO, which depletes GSH by inhibiting its synthesis, augments TRPM2 currents. Additionally, we demonstrate that GSH inhibits TRPM2 currents through a thiol-independent mechanism, and produces a 3.5-fold shift in the dose-response curve generated by ADPR, the intracellular agonist for TRPM2.</p> <p>Conclusion</p> <p>These results indicate that GSH plays a physiologically relevant role in the regulation of TRPM2 currents in hippocampal pyramidal neurons. This interaction may play an important role in aging and neurological diseases associated with depletion of GSH.</p> http://www.molecularbrain.com/content/5/1/11TRPM2AgingGlutathioneOxidative stressPyramidal neuronPrimary hippocampal culture |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Belrose Jillian C Xie Yu-Feng Gierszewski Lynn J MacDonald John F Jackson Michael F |
spellingShingle |
Belrose Jillian C Xie Yu-Feng Gierszewski Lynn J MacDonald John F Jackson Michael F Loss of glutathione homeostasis associated with neuronal senescence facilitates TRPM2 channel activation in cultured hippocampal pyramidal neurons Molecular Brain TRPM2 Aging Glutathione Oxidative stress Pyramidal neuron Primary hippocampal culture |
author_facet |
Belrose Jillian C Xie Yu-Feng Gierszewski Lynn J MacDonald John F Jackson Michael F |
author_sort |
Belrose Jillian C |
title |
Loss of glutathione homeostasis associated with neuronal senescence facilitates TRPM2 channel activation in cultured hippocampal pyramidal neurons |
title_short |
Loss of glutathione homeostasis associated with neuronal senescence facilitates TRPM2 channel activation in cultured hippocampal pyramidal neurons |
title_full |
Loss of glutathione homeostasis associated with neuronal senescence facilitates TRPM2 channel activation in cultured hippocampal pyramidal neurons |
title_fullStr |
Loss of glutathione homeostasis associated with neuronal senescence facilitates TRPM2 channel activation in cultured hippocampal pyramidal neurons |
title_full_unstemmed |
Loss of glutathione homeostasis associated with neuronal senescence facilitates TRPM2 channel activation in cultured hippocampal pyramidal neurons |
title_sort |
loss of glutathione homeostasis associated with neuronal senescence facilitates trpm2 channel activation in cultured hippocampal pyramidal neurons |
publisher |
BMC |
series |
Molecular Brain |
issn |
1756-6606 |
publishDate |
2012-04-01 |
description |
<p>Abstract</p> <p>Background</p> <p>Glutathione (GSH) plays an important role in neuronal oxidant defence. Depletion of cellular GSH is observed in neurodegenerative diseases and thereby contributes to the associated oxidative stress and Ca<sup>2+ </sup>dysregulation. Whether depletion of cellular GSH, associated with neuronal senescence, directly influences Ca<sup>2+ </sup>permeation pathways is not known. Transient receptor potential melastatin type 2 (TRPM2) is a Ca<sup>2+ </sup>permeable non-selective cation channel expressed in several cell types including hippocampal pyramidal neurons. Moreover, activation of TRPM2 during oxidative stress has been linked to cell death. Importantly, GSH has been reported to inhibit TRPM2 channels, suggesting they may directly contribute to Ca<sup>2+ </sup>dysregulation associated with neuronal senescence. Herein, we explore the relation between cellular GSH and TRPM2 channel activity in long-term cultures of hippocampal neurons.</p> <p>Results</p> <p>In whole-cell voltage-clamp recordings, we observe that TRPM2 current density increases in cultured pyramidal neurons over time in vitro. The observed increase in current density was prevented by treatment with NAC, a precursor to GSH synthesis. Conversely, treatment of cultures maintained for 2 weeks in vitro with L-BSO, which depletes GSH by inhibiting its synthesis, augments TRPM2 currents. Additionally, we demonstrate that GSH inhibits TRPM2 currents through a thiol-independent mechanism, and produces a 3.5-fold shift in the dose-response curve generated by ADPR, the intracellular agonist for TRPM2.</p> <p>Conclusion</p> <p>These results indicate that GSH plays a physiologically relevant role in the regulation of TRPM2 currents in hippocampal pyramidal neurons. This interaction may play an important role in aging and neurological diseases associated with depletion of GSH.</p> |
topic |
TRPM2 Aging Glutathione Oxidative stress Pyramidal neuron Primary hippocampal culture |
url |
http://www.molecularbrain.com/content/5/1/11 |
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