Light, lipids and photoreceptor survival: live or let die?
- Autores
- Rotstein, Nora Patricia; German, Olga Lorena; Agnolazza, Daniela Luciana; Politi, Luis Enrique
- Año de publicación
- 2014
- Idioma
- inglés
- Tipo de recurso
- documento de conferencia
- Estado
- versión publicada
- Descripción
- Due to its constant exposure to light and its high oxygen consumption the retina is highly sensitive to oxidative damage, which is involved in the death of photoreceptors in retinal neurodegenerative diseases such as retinitis pigmentosa and age related macular degeneration. A peculiar characteristic of retina lipids, their high content of polyunsaturated fatty acids, mainly docosahexaenoico acid (DHA), has also been proposed to contribute to this sensitivity. However, the role of DHA in the retina is still controversial. Its six double bonds make it highly prone to peroxidation and it has been shown to increase retina vulnerability to photo-oxidative damage. However, DHA has also a protective role on photoreceptors. Our lab has shown that DHA protects photoreceptors from oxidative stress by activating the ERK/MAPK pathway. We now investigated how DHA activated this pathway and if it also activated antioxidant defense mechanisms in photoreceptors. Addition of retinoid X receptors (RXR) antagonists to rat retinal neuronal cultures inhibited DHA protection during early development in vitro and upon oxidative stress. Inhibition of an alternative pathway, involving tyrosine kinase (Trk) receptors, did not affect DHA prevention of photoreceptor apoptosis. These results imply that activation of RXR was required for DHA protection. H2O2 treatment increased reactive oxygen species (ROS) production in retinal neurons, inducing photoreceptor apoptosis. DHA prevented H2O2-induced apoptosis, simultaneously decreasing ROS formation. Analysis of enzymatic activity evidenced that DHA addition increased glutathione peroxidase activity in cultures treated with or without H2O2. Our results provide the first evidence that DHA activates RXR to prevent photoreceptor death. They also suggest that DHA activation of antioxidant defense mechanisms is at least in part responsible of protecting photoreceptors from oxidative stress
Fil: Rotstein, Nora Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina
Fil: German, Olga Lorena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina
Fil: Agnolazza, Daniela Luciana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina
Fil: Politi, Luis Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina
16th International Congress on Photobiology
Córdoba
Argentina
International Union of Photobiology - Materia
-
PHOTORECEPTOR
RETINA
DOCOSAHEXAENOIC ACID
RETINOID X RECEPTOR - 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:11336/235877
Ver los metadatos del registro completo
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Light, lipids and photoreceptor survival: live or let die?Rotstein, Nora PatriciaGerman, Olga LorenaAgnolazza, Daniela LucianaPoliti, Luis EnriquePHOTORECEPTORRETINADOCOSAHEXAENOIC ACIDRETINOID X RECEPTORhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Due to its constant exposure to light and its high oxygen consumption the retina is highly sensitive to oxidative damage, which is involved in the death of photoreceptors in retinal neurodegenerative diseases such as retinitis pigmentosa and age related macular degeneration. A peculiar characteristic of retina lipids, their high content of polyunsaturated fatty acids, mainly docosahexaenoico acid (DHA), has also been proposed to contribute to this sensitivity. However, the role of DHA in the retina is still controversial. Its six double bonds make it highly prone to peroxidation and it has been shown to increase retina vulnerability to photo-oxidative damage. However, DHA has also a protective role on photoreceptors. Our lab has shown that DHA protects photoreceptors from oxidative stress by activating the ERK/MAPK pathway. We now investigated how DHA activated this pathway and if it also activated antioxidant defense mechanisms in photoreceptors. Addition of retinoid X receptors (RXR) antagonists to rat retinal neuronal cultures inhibited DHA protection during early development in vitro and upon oxidative stress. Inhibition of an alternative pathway, involving tyrosine kinase (Trk) receptors, did not affect DHA prevention of photoreceptor apoptosis. These results imply that activation of RXR was required for DHA protection. H2O2 treatment increased reactive oxygen species (ROS) production in retinal neurons, inducing photoreceptor apoptosis. DHA prevented H2O2-induced apoptosis, simultaneously decreasing ROS formation. Analysis of enzymatic activity evidenced that DHA addition increased glutathione peroxidase activity in cultures treated with or without H2O2. Our results provide the first evidence that DHA activates RXR to prevent photoreceptor death. They also suggest that DHA activation of antioxidant defense mechanisms is at least in part responsible of protecting photoreceptors from oxidative stressFil: Rotstein, Nora Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; ArgentinaFil: German, Olga Lorena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; ArgentinaFil: Agnolazza, Daniela Luciana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; ArgentinaFil: Politi, Luis Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina16th International Congress on PhotobiologyCórdobaArgentinaInternational Union of PhotobiologyInternational Union of Photobiology2014info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/235877Light, lipids and photoreceptor survival: live or let die?; 16th International Congress on Photobiology; Córdoba; Argentina; 2014; 252-252CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://grupoargentinodefotobiologia.info/site/site/grupar/pluginfile.php/86/block_html/content/16icp-libro.pdfInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:40:45Zoai:ri.conicet.gov.ar:11336/235877instacron: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 10:40:45.336CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Light, lipids and photoreceptor survival: live or let die? |
title |
Light, lipids and photoreceptor survival: live or let die? |
spellingShingle |
Light, lipids and photoreceptor survival: live or let die? Rotstein, Nora Patricia PHOTORECEPTOR RETINA DOCOSAHEXAENOIC ACID RETINOID X RECEPTOR |
title_short |
Light, lipids and photoreceptor survival: live or let die? |
title_full |
Light, lipids and photoreceptor survival: live or let die? |
title_fullStr |
Light, lipids and photoreceptor survival: live or let die? |
title_full_unstemmed |
Light, lipids and photoreceptor survival: live or let die? |
title_sort |
Light, lipids and photoreceptor survival: live or let die? |
dc.creator.none.fl_str_mv |
Rotstein, Nora Patricia German, Olga Lorena Agnolazza, Daniela Luciana Politi, Luis Enrique |
author |
Rotstein, Nora Patricia |
author_facet |
Rotstein, Nora Patricia German, Olga Lorena Agnolazza, Daniela Luciana Politi, Luis Enrique |
author_role |
author |
author2 |
German, Olga Lorena Agnolazza, Daniela Luciana Politi, Luis Enrique |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
PHOTORECEPTOR RETINA DOCOSAHEXAENOIC ACID RETINOID X RECEPTOR |
topic |
PHOTORECEPTOR RETINA DOCOSAHEXAENOIC ACID RETINOID X RECEPTOR |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Due to its constant exposure to light and its high oxygen consumption the retina is highly sensitive to oxidative damage, which is involved in the death of photoreceptors in retinal neurodegenerative diseases such as retinitis pigmentosa and age related macular degeneration. A peculiar characteristic of retina lipids, their high content of polyunsaturated fatty acids, mainly docosahexaenoico acid (DHA), has also been proposed to contribute to this sensitivity. However, the role of DHA in the retina is still controversial. Its six double bonds make it highly prone to peroxidation and it has been shown to increase retina vulnerability to photo-oxidative damage. However, DHA has also a protective role on photoreceptors. Our lab has shown that DHA protects photoreceptors from oxidative stress by activating the ERK/MAPK pathway. We now investigated how DHA activated this pathway and if it also activated antioxidant defense mechanisms in photoreceptors. Addition of retinoid X receptors (RXR) antagonists to rat retinal neuronal cultures inhibited DHA protection during early development in vitro and upon oxidative stress. Inhibition of an alternative pathway, involving tyrosine kinase (Trk) receptors, did not affect DHA prevention of photoreceptor apoptosis. These results imply that activation of RXR was required for DHA protection. H2O2 treatment increased reactive oxygen species (ROS) production in retinal neurons, inducing photoreceptor apoptosis. DHA prevented H2O2-induced apoptosis, simultaneously decreasing ROS formation. Analysis of enzymatic activity evidenced that DHA addition increased glutathione peroxidase activity in cultures treated with or without H2O2. Our results provide the first evidence that DHA activates RXR to prevent photoreceptor death. They also suggest that DHA activation of antioxidant defense mechanisms is at least in part responsible of protecting photoreceptors from oxidative stress Fil: Rotstein, Nora Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina Fil: German, Olga Lorena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina Fil: Agnolazza, Daniela Luciana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina Fil: Politi, Luis Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina 16th International Congress on Photobiology Córdoba Argentina International Union of Photobiology |
description |
Due to its constant exposure to light and its high oxygen consumption the retina is highly sensitive to oxidative damage, which is involved in the death of photoreceptors in retinal neurodegenerative diseases such as retinitis pigmentosa and age related macular degeneration. A peculiar characteristic of retina lipids, their high content of polyunsaturated fatty acids, mainly docosahexaenoico acid (DHA), has also been proposed to contribute to this sensitivity. However, the role of DHA in the retina is still controversial. Its six double bonds make it highly prone to peroxidation and it has been shown to increase retina vulnerability to photo-oxidative damage. However, DHA has also a protective role on photoreceptors. Our lab has shown that DHA protects photoreceptors from oxidative stress by activating the ERK/MAPK pathway. We now investigated how DHA activated this pathway and if it also activated antioxidant defense mechanisms in photoreceptors. Addition of retinoid X receptors (RXR) antagonists to rat retinal neuronal cultures inhibited DHA protection during early development in vitro and upon oxidative stress. Inhibition of an alternative pathway, involving tyrosine kinase (Trk) receptors, did not affect DHA prevention of photoreceptor apoptosis. These results imply that activation of RXR was required for DHA protection. H2O2 treatment increased reactive oxygen species (ROS) production in retinal neurons, inducing photoreceptor apoptosis. DHA prevented H2O2-induced apoptosis, simultaneously decreasing ROS formation. Analysis of enzymatic activity evidenced that DHA addition increased glutathione peroxidase activity in cultures treated with or without H2O2. Our results provide the first evidence that DHA activates RXR to prevent photoreceptor death. They also suggest that DHA activation of antioxidant defense mechanisms is at least in part responsible of protecting photoreceptors from oxidative stress |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/conferenceObject Congreso Book http://purl.org/coar/resource_type/c_5794 info:ar-repo/semantics/documentoDeConferencia |
status_str |
publishedVersion |
format |
conferenceObject |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/235877 Light, lipids and photoreceptor survival: live or let die?; 16th International Congress on Photobiology; Córdoba; Argentina; 2014; 252-252 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/235877 |
identifier_str_mv |
Light, lipids and photoreceptor survival: live or let die?; 16th International Congress on Photobiology; Córdoba; Argentina; 2014; 252-252 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://grupoargentinodefotobiologia.info/site/site/grupar/pluginfile.php/86/block_html/content/16icp-libro.pdf |
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info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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openAccess |
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https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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application/pdf application/pdf application/pdf application/pdf |
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Internacional |
dc.publisher.none.fl_str_mv |
International Union of Photobiology |
publisher.none.fl_str_mv |
International Union of Photobiology |
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reponame:CONICET Digital (CONICET) instname: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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