Stress-induced decrement in the plasticity of the physical properties of chick brain membranes
- Autores
- Garcia, Daniel Asmed; Marin, Raul Hector; Perillo, Maria Angelica
- Año de publicación
- 2002
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The molecular basis underlying the stress-induced increment in the density of central benzodiazepine receptor from chick forebrain, observed previously at 4°C, was studied from a biophysical perspective. The thermal dependence of [3H]flunitrazepam binding to the central benzodiazepine receptor and the supramolecular organization were studied in forebrain membranes from chicks submitted to partial water immersion. The equilibrium dissociation constants increased with temperature in membrane from both control and stressed chicks. The heat capacity values in control samples (ΔCp, CON) were significantly less negative than ΔCp STR. Changes in ΔH and ΔS between 4-37°C were greater in stressed chicks compared to control; however, the binding was exothermic and driven by enthalpy in both conditions. At 4°C, the receptor density (Bmax) was higher in stressed chicks compared to control. Such a difference was lost irreversibly upon temperature elevation, possibly due to the hysteresis between the heating and cooling behaviour of Bmax, CON and the constancy in Bmax, STR. The fluorescence anisotropy of diphenylhexatriene was higher in control samples with respect to stressed chicks below 10°C. A temperature-induced increment in protein intrinsic-fluorescence was observed only in control, and was quenched by acrylamide more easily at 4°C than at 25°C. A higher microviscosity at 4°C in control favoured more external localizations of integral proteins; at higher temperatures, tryptophan residues moved to hydrophobic membrane-regions. Changes in the membrane-organization towards more fluid states favoured the accessibility of benzodiazepine to the central benzodiazepine receptor, expressed by the higher values of Bmax found in stressed samples at low temperatures with respect to control samples.
Fil: Garcia, Daniel Asmed. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; Argentina
Fil: Marin, Raul Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; Argentina
Fil: Perillo, Maria Angelica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; Argentina - Materia
-
Benzodiazepine Binding
Dph Fluorescence
Dynamic Quenching
Gabaa Receptor
Membrane Fluidity
Stress
Thermodynamics
Tryptophan Fluorescence - 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:11336/65677
Ver los metadatos del registro completo
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Stress-induced decrement in the plasticity of the physical properties of chick brain membranesGarcia, Daniel AsmedMarin, Raul HectorPerillo, Maria AngelicaBenzodiazepine BindingDph FluorescenceDynamic QuenchingGabaa ReceptorMembrane FluidityStressThermodynamicsTryptophan Fluorescencehttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1The molecular basis underlying the stress-induced increment in the density of central benzodiazepine receptor from chick forebrain, observed previously at 4°C, was studied from a biophysical perspective. The thermal dependence of [3H]flunitrazepam binding to the central benzodiazepine receptor and the supramolecular organization were studied in forebrain membranes from chicks submitted to partial water immersion. The equilibrium dissociation constants increased with temperature in membrane from both control and stressed chicks. The heat capacity values in control samples (ΔCp, CON) were significantly less negative than ΔCp STR. Changes in ΔH and ΔS between 4-37°C were greater in stressed chicks compared to control; however, the binding was exothermic and driven by enthalpy in both conditions. At 4°C, the receptor density (Bmax) was higher in stressed chicks compared to control. Such a difference was lost irreversibly upon temperature elevation, possibly due to the hysteresis between the heating and cooling behaviour of Bmax, CON and the constancy in Bmax, STR. The fluorescence anisotropy of diphenylhexatriene was higher in control samples with respect to stressed chicks below 10°C. A temperature-induced increment in protein intrinsic-fluorescence was observed only in control, and was quenched by acrylamide more easily at 4°C than at 25°C. A higher microviscosity at 4°C in control favoured more external localizations of integral proteins; at higher temperatures, tryptophan residues moved to hydrophobic membrane-regions. Changes in the membrane-organization towards more fluid states favoured the accessibility of benzodiazepine to the central benzodiazepine receptor, expressed by the higher values of Bmax found in stressed samples at low temperatures with respect to control samples.Fil: Garcia, Daniel Asmed. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; ArgentinaFil: Marin, Raul Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; ArgentinaFil: Perillo, Maria Angelica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; ArgentinaTaylor & Francis Ltd2002-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/65677Garcia, Daniel Asmed; Marin, Raul Hector; Perillo, Maria Angelica; Stress-induced decrement in the plasticity of the physical properties of chick brain membranes; Taylor & Francis Ltd; Molecular Membrane Biology; 19; 3; 7-2002; 221-2300968-7688CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1080/09687680210156786info:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/abs/10.1080/09687680210156786info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:52:43Zoai:ri.conicet.gov.ar:11336/65677instacron: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:34982025-09-29 09:52:43.61CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Stress-induced decrement in the plasticity of the physical properties of chick brain membranes |
title |
Stress-induced decrement in the plasticity of the physical properties of chick brain membranes |
spellingShingle |
Stress-induced decrement in the plasticity of the physical properties of chick brain membranes Garcia, Daniel Asmed Benzodiazepine Binding Dph Fluorescence Dynamic Quenching Gabaa Receptor Membrane Fluidity Stress Thermodynamics Tryptophan Fluorescence |
title_short |
Stress-induced decrement in the plasticity of the physical properties of chick brain membranes |
title_full |
Stress-induced decrement in the plasticity of the physical properties of chick brain membranes |
title_fullStr |
Stress-induced decrement in the plasticity of the physical properties of chick brain membranes |
title_full_unstemmed |
Stress-induced decrement in the plasticity of the physical properties of chick brain membranes |
title_sort |
Stress-induced decrement in the plasticity of the physical properties of chick brain membranes |
dc.creator.none.fl_str_mv |
Garcia, Daniel Asmed Marin, Raul Hector Perillo, Maria Angelica |
author |
Garcia, Daniel Asmed |
author_facet |
Garcia, Daniel Asmed Marin, Raul Hector Perillo, Maria Angelica |
author_role |
author |
author2 |
Marin, Raul Hector Perillo, Maria Angelica |
author2_role |
author author |
dc.subject.none.fl_str_mv |
Benzodiazepine Binding Dph Fluorescence Dynamic Quenching Gabaa Receptor Membrane Fluidity Stress Thermodynamics Tryptophan Fluorescence |
topic |
Benzodiazepine Binding Dph Fluorescence Dynamic Quenching Gabaa Receptor Membrane Fluidity Stress Thermodynamics Tryptophan Fluorescence |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
The molecular basis underlying the stress-induced increment in the density of central benzodiazepine receptor from chick forebrain, observed previously at 4°C, was studied from a biophysical perspective. The thermal dependence of [3H]flunitrazepam binding to the central benzodiazepine receptor and the supramolecular organization were studied in forebrain membranes from chicks submitted to partial water immersion. The equilibrium dissociation constants increased with temperature in membrane from both control and stressed chicks. The heat capacity values in control samples (ΔCp, CON) were significantly less negative than ΔCp STR. Changes in ΔH and ΔS between 4-37°C were greater in stressed chicks compared to control; however, the binding was exothermic and driven by enthalpy in both conditions. At 4°C, the receptor density (Bmax) was higher in stressed chicks compared to control. Such a difference was lost irreversibly upon temperature elevation, possibly due to the hysteresis between the heating and cooling behaviour of Bmax, CON and the constancy in Bmax, STR. The fluorescence anisotropy of diphenylhexatriene was higher in control samples with respect to stressed chicks below 10°C. A temperature-induced increment in protein intrinsic-fluorescence was observed only in control, and was quenched by acrylamide more easily at 4°C than at 25°C. A higher microviscosity at 4°C in control favoured more external localizations of integral proteins; at higher temperatures, tryptophan residues moved to hydrophobic membrane-regions. Changes in the membrane-organization towards more fluid states favoured the accessibility of benzodiazepine to the central benzodiazepine receptor, expressed by the higher values of Bmax found in stressed samples at low temperatures with respect to control samples. Fil: Garcia, Daniel Asmed. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; Argentina Fil: Marin, Raul Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; Argentina Fil: Perillo, Maria Angelica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; Argentina |
description |
The molecular basis underlying the stress-induced increment in the density of central benzodiazepine receptor from chick forebrain, observed previously at 4°C, was studied from a biophysical perspective. The thermal dependence of [3H]flunitrazepam binding to the central benzodiazepine receptor and the supramolecular organization were studied in forebrain membranes from chicks submitted to partial water immersion. The equilibrium dissociation constants increased with temperature in membrane from both control and stressed chicks. The heat capacity values in control samples (ΔCp, CON) were significantly less negative than ΔCp STR. Changes in ΔH and ΔS between 4-37°C were greater in stressed chicks compared to control; however, the binding was exothermic and driven by enthalpy in both conditions. At 4°C, the receptor density (Bmax) was higher in stressed chicks compared to control. Such a difference was lost irreversibly upon temperature elevation, possibly due to the hysteresis between the heating and cooling behaviour of Bmax, CON and the constancy in Bmax, STR. The fluorescence anisotropy of diphenylhexatriene was higher in control samples with respect to stressed chicks below 10°C. A temperature-induced increment in protein intrinsic-fluorescence was observed only in control, and was quenched by acrylamide more easily at 4°C than at 25°C. A higher microviscosity at 4°C in control favoured more external localizations of integral proteins; at higher temperatures, tryptophan residues moved to hydrophobic membrane-regions. Changes in the membrane-organization towards more fluid states favoured the accessibility of benzodiazepine to the central benzodiazepine receptor, expressed by the higher values of Bmax found in stressed samples at low temperatures with respect to control samples. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-07 |
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/11336/65677 Garcia, Daniel Asmed; Marin, Raul Hector; Perillo, Maria Angelica; Stress-induced decrement in the plasticity of the physical properties of chick brain membranes; Taylor & Francis Ltd; Molecular Membrane Biology; 19; 3; 7-2002; 221-230 0968-7688 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/65677 |
identifier_str_mv |
Garcia, Daniel Asmed; Marin, Raul Hector; Perillo, Maria Angelica; Stress-induced decrement in the plasticity of the physical properties of chick brain membranes; Taylor & Francis Ltd; Molecular Membrane Biology; 19; 3; 7-2002; 221-230 0968-7688 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1080/09687680210156786 info:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/abs/10.1080/09687680210156786 |
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 application/pdf |
dc.publisher.none.fl_str_mv |
Taylor & Francis Ltd |
publisher.none.fl_str_mv |
Taylor & Francis Ltd |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844613616232300544 |
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13.070432 |