Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity
- Autores
- Filosa, J. A; Naskar, K.; Perfume, Guadalupe; Iddings, J. A.; Biancardi, V. C.; Vatta, Marcelo Sergio; Stern, Jorge Enrique
- Año de publicación
- 2012
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- In addition to their peripheral vasoactive effects, accumulating evidence supports an important role for endothelins (ETs) in the regulation of the hypothalamic magnocellular neurosecretory system, which produces and releases the neurohormones vasopressin (VP) and oxytocin (OT). Still, the precise cellular substrates, loci and mechanisms underlying the actions of ETs on the magnocellular system are poorly understood. In the present study, we combined patch-clamp electrophysiology, confocal Ca 2+ imaging and immunohistochemistry to study the actions of ETs on supraoptic nucleus (SON) magnocellular neurosecretory neurones and astrocytes. Our studies show that ET-1 evoked rises in [Ca 2+] i levels in SON astrocytes (but not neurones), an effect largely mediated by the activation of ET B receptors and mobilisation of thapsigargin-sensitive Ca 2+ stores. The presence of ET B receptors in SON astrocytes was also verified immunohistochemically. ET B receptor activation either increased (75%) or decreased (25%) SON firing activity, both in VP and putative OT neurones, and these effects were prevented when slices were preincubated in glutamate receptor blockers or nitric oxide synthase blockers, respectively. Moreover, ET B-mediated effects in SON neurones were also prevented by a gliotoxin compound, and when changes in [Ca 2+] i were prevented with bath-applied BAPTA-AM or thapsigargin. Conversely, intracellular Ca 2+ chelation in the recorded SON neurones failed to block ET B-mediated effects. In summary, our results indicate that ET B receptor activation in SON astrocytes induces the mobilisation of [Ca 2+] i, likely resulting in the activation of glutamate and nitric oxide signalling pathways, evoking in turn excitatory and inhibitory SON neuronal responses, respectively. Taken together, our study supports an important role for astrocytes in mediating the actions of ETs on the magnocellular neurosecretory system. © 2011 The Authors. Journal of Neuroendocrinology © 2011 Blackwell Publishing Ltd.
Fil: Filosa, J. A. Georgia Health Sciences University; Estados Unidos
Fil: Naskar, K.. Georgia Health Sciences University; Estados Unidos
Fil: Perfume, Guadalupe. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Metabolismo del Fármaco. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Metabolismo del Fármaco; Argentina
Fil: Iddings, J. A.. Georgia Health Sciences University; Estados Unidos
Fil: Biancardi, V. C.. Georgia Health Sciences University; Estados Unidos
Fil: Vatta, Marcelo Sergio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Metabolismo del Fármaco. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Metabolismo del Fármaco; Argentina
Fil: Stern, Jorge Enrique. Georgia Health Sciences University; Estados Unidos - Materia
-
Endothelins
Glia
Hypothalamus
Oxytocin
Vasopressin - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/67398
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Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing ActivityFilosa, J. ANaskar, K.Perfume, GuadalupeIddings, J. A.Biancardi, V. C.Vatta, Marcelo SergioStern, Jorge EnriqueEndothelinsGliaHypothalamusOxytocinVasopressinhttps://purl.org/becyt/ford/3.1https://purl.org/becyt/ford/3In addition to their peripheral vasoactive effects, accumulating evidence supports an important role for endothelins (ETs) in the regulation of the hypothalamic magnocellular neurosecretory system, which produces and releases the neurohormones vasopressin (VP) and oxytocin (OT). Still, the precise cellular substrates, loci and mechanisms underlying the actions of ETs on the magnocellular system are poorly understood. In the present study, we combined patch-clamp electrophysiology, confocal Ca 2+ imaging and immunohistochemistry to study the actions of ETs on supraoptic nucleus (SON) magnocellular neurosecretory neurones and astrocytes. Our studies show that ET-1 evoked rises in [Ca 2+] i levels in SON astrocytes (but not neurones), an effect largely mediated by the activation of ET B receptors and mobilisation of thapsigargin-sensitive Ca 2+ stores. The presence of ET B receptors in SON astrocytes was also verified immunohistochemically. ET B receptor activation either increased (75%) or decreased (25%) SON firing activity, both in VP and putative OT neurones, and these effects were prevented when slices were preincubated in glutamate receptor blockers or nitric oxide synthase blockers, respectively. Moreover, ET B-mediated effects in SON neurones were also prevented by a gliotoxin compound, and when changes in [Ca 2+] i were prevented with bath-applied BAPTA-AM or thapsigargin. Conversely, intracellular Ca 2+ chelation in the recorded SON neurones failed to block ET B-mediated effects. In summary, our results indicate that ET B receptor activation in SON astrocytes induces the mobilisation of [Ca 2+] i, likely resulting in the activation of glutamate and nitric oxide signalling pathways, evoking in turn excitatory and inhibitory SON neuronal responses, respectively. Taken together, our study supports an important role for astrocytes in mediating the actions of ETs on the magnocellular neurosecretory system. © 2011 The Authors. Journal of Neuroendocrinology © 2011 Blackwell Publishing Ltd.Fil: Filosa, J. A. Georgia Health Sciences University; Estados UnidosFil: Naskar, K.. Georgia Health Sciences University; Estados UnidosFil: Perfume, Guadalupe. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Metabolismo del Fármaco. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Metabolismo del Fármaco; ArgentinaFil: Iddings, J. A.. Georgia Health Sciences University; Estados UnidosFil: Biancardi, V. C.. Georgia Health Sciences University; Estados UnidosFil: Vatta, Marcelo Sergio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Metabolismo del Fármaco. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Metabolismo del Fármaco; ArgentinaFil: Stern, Jorge Enrique. Georgia Health Sciences University; Estados UnidosWiley Blackwell Publishing, Inc2012-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/67398Filosa, J. A; Naskar, K.; Perfume, Guadalupe; Iddings, J. A.; Biancardi, V. C.; et al.; Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity; Wiley Blackwell Publishing, Inc; Journal of Neuroendocrinology; 24; 2; 2-2012; 378-3920953-8194CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2826.2011.02243.xinfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2826.2011.02243.xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:55:21Zoai:ri.conicet.gov.ar:11336/67398instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:55:21.476CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity |
title |
Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity |
spellingShingle |
Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity Filosa, J. A Endothelins Glia Hypothalamus Oxytocin Vasopressin |
title_short |
Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity |
title_full |
Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity |
title_fullStr |
Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity |
title_full_unstemmed |
Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity |
title_sort |
Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity |
dc.creator.none.fl_str_mv |
Filosa, J. A Naskar, K. Perfume, Guadalupe Iddings, J. A. Biancardi, V. C. Vatta, Marcelo Sergio Stern, Jorge Enrique |
author |
Filosa, J. A |
author_facet |
Filosa, J. A Naskar, K. Perfume, Guadalupe Iddings, J. A. Biancardi, V. C. Vatta, Marcelo Sergio Stern, Jorge Enrique |
author_role |
author |
author2 |
Naskar, K. Perfume, Guadalupe Iddings, J. A. Biancardi, V. C. Vatta, Marcelo Sergio Stern, Jorge Enrique |
author2_role |
author author author author author author |
dc.subject.none.fl_str_mv |
Endothelins Glia Hypothalamus Oxytocin Vasopressin |
topic |
Endothelins Glia Hypothalamus Oxytocin Vasopressin |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/3.1 https://purl.org/becyt/ford/3 |
dc.description.none.fl_txt_mv |
In addition to their peripheral vasoactive effects, accumulating evidence supports an important role for endothelins (ETs) in the regulation of the hypothalamic magnocellular neurosecretory system, which produces and releases the neurohormones vasopressin (VP) and oxytocin (OT). Still, the precise cellular substrates, loci and mechanisms underlying the actions of ETs on the magnocellular system are poorly understood. In the present study, we combined patch-clamp electrophysiology, confocal Ca 2+ imaging and immunohistochemistry to study the actions of ETs on supraoptic nucleus (SON) magnocellular neurosecretory neurones and astrocytes. Our studies show that ET-1 evoked rises in [Ca 2+] i levels in SON astrocytes (but not neurones), an effect largely mediated by the activation of ET B receptors and mobilisation of thapsigargin-sensitive Ca 2+ stores. The presence of ET B receptors in SON astrocytes was also verified immunohistochemically. ET B receptor activation either increased (75%) or decreased (25%) SON firing activity, both in VP and putative OT neurones, and these effects were prevented when slices were preincubated in glutamate receptor blockers or nitric oxide synthase blockers, respectively. Moreover, ET B-mediated effects in SON neurones were also prevented by a gliotoxin compound, and when changes in [Ca 2+] i were prevented with bath-applied BAPTA-AM or thapsigargin. Conversely, intracellular Ca 2+ chelation in the recorded SON neurones failed to block ET B-mediated effects. In summary, our results indicate that ET B receptor activation in SON astrocytes induces the mobilisation of [Ca 2+] i, likely resulting in the activation of glutamate and nitric oxide signalling pathways, evoking in turn excitatory and inhibitory SON neuronal responses, respectively. Taken together, our study supports an important role for astrocytes in mediating the actions of ETs on the magnocellular neurosecretory system. © 2011 The Authors. Journal of Neuroendocrinology © 2011 Blackwell Publishing Ltd. Fil: Filosa, J. A. Georgia Health Sciences University; Estados Unidos Fil: Naskar, K.. Georgia Health Sciences University; Estados Unidos Fil: Perfume, Guadalupe. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Metabolismo del Fármaco. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Metabolismo del Fármaco; Argentina Fil: Iddings, J. A.. Georgia Health Sciences University; Estados Unidos Fil: Biancardi, V. C.. Georgia Health Sciences University; Estados Unidos Fil: Vatta, Marcelo Sergio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Metabolismo del Fármaco. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Metabolismo del Fármaco; Argentina Fil: Stern, Jorge Enrique. Georgia Health Sciences University; Estados Unidos |
description |
In addition to their peripheral vasoactive effects, accumulating evidence supports an important role for endothelins (ETs) in the regulation of the hypothalamic magnocellular neurosecretory system, which produces and releases the neurohormones vasopressin (VP) and oxytocin (OT). Still, the precise cellular substrates, loci and mechanisms underlying the actions of ETs on the magnocellular system are poorly understood. In the present study, we combined patch-clamp electrophysiology, confocal Ca 2+ imaging and immunohistochemistry to study the actions of ETs on supraoptic nucleus (SON) magnocellular neurosecretory neurones and astrocytes. Our studies show that ET-1 evoked rises in [Ca 2+] i levels in SON astrocytes (but not neurones), an effect largely mediated by the activation of ET B receptors and mobilisation of thapsigargin-sensitive Ca 2+ stores. The presence of ET B receptors in SON astrocytes was also verified immunohistochemically. ET B receptor activation either increased (75%) or decreased (25%) SON firing activity, both in VP and putative OT neurones, and these effects were prevented when slices were preincubated in glutamate receptor blockers or nitric oxide synthase blockers, respectively. Moreover, ET B-mediated effects in SON neurones were also prevented by a gliotoxin compound, and when changes in [Ca 2+] i were prevented with bath-applied BAPTA-AM or thapsigargin. Conversely, intracellular Ca 2+ chelation in the recorded SON neurones failed to block ET B-mediated effects. In summary, our results indicate that ET B receptor activation in SON astrocytes induces the mobilisation of [Ca 2+] i, likely resulting in the activation of glutamate and nitric oxide signalling pathways, evoking in turn excitatory and inhibitory SON neuronal responses, respectively. Taken together, our study supports an important role for astrocytes in mediating the actions of ETs on the magnocellular neurosecretory system. © 2011 The Authors. Journal of Neuroendocrinology © 2011 Blackwell Publishing Ltd. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-02 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/67398 Filosa, J. A; Naskar, K.; Perfume, Guadalupe; Iddings, J. A.; Biancardi, V. C.; et al.; Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity; Wiley Blackwell Publishing, Inc; Journal of Neuroendocrinology; 24; 2; 2-2012; 378-392 0953-8194 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/67398 |
identifier_str_mv |
Filosa, J. A; Naskar, K.; Perfume, Guadalupe; Iddings, J. A.; Biancardi, V. C.; et al.; Endothelin-Mediated Calcium Responses in Supraoptic Nucleus Astrocytes Influence Magnocellular Neurosecretory Firing Activity; Wiley Blackwell Publishing, Inc; Journal of Neuroendocrinology; 24; 2; 2-2012; 378-392 0953-8194 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2826.2011.02243.x info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2826.2011.02243.x |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Wiley Blackwell Publishing, Inc |
publisher.none.fl_str_mv |
Wiley Blackwell Publishing, Inc |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1842269339562016768 |
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13.13397 |