ETB2 Receptor Subtype Stimulation Relaxes the Iris Sphincter Muscle
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://hdl.handle.net/10216/9207 |
Resumo: | Effects of ETB receptor stimulation and its subcellular pathways were evaluated in carbachol pre-contracted rabbit iris sphincter muscles (n=51). ETB stimulation with sarafotoxin (SRTX-c; 10(-10)-10(-6) M) was tested in the absence (n=7) or presence of 10(-5) M of: BQ-788 (ETB2 receptor antagonist; n=6), L-NA (NOS inhibitor; n=7) or indomethacin (cyclooxygenase inhibitor; n=10). Effects of ETB stimulation by endothelin-1 (ET-1; 10-(10)-10(-7) M) in the presence of an ETA receptor antagonist (BQ-123; 10(-5) M; n=7) and of ETB1 stimulation by IRL-1620 (10-(10)-10(-7) M; n=7) were also tested. Finally, the effects of SRTX-c (10(-9)-10(-7) M) in electric field stimulation (EFS) contraction were evaluated (n=7). ETB receptor stimulation by SRTX-c or ET-1 in presence of BQ-123 promoted a concentration-dependent relaxation of the rabbit iris sphincter muscle by 10.8 +/- 2.0 % and 9.4 +/- 1.8 %, respectively. This effect was blocked by BQ-788 (-2.3 +/- 2.0 %), L-NA (4.5 +/- 2.3 %) or indomethacin (2.3 +/- 2.9 %). Selective ETB1 stimulation by IRL-1620 did not relax the iris sphincter muscle (0.9 +/- 5.4 %). EFS elicited contraction was not altered by SRTX-c. In conclusion, ETB receptor stimulation relaxes the carbachol precontracted iris sphincter muscle, an effect that is mediated by the ETB2 receptor subtype, through NO and the release of prostaglandins. |
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ETB2 Receptor Subtype Stimulation Relaxes the Iris Sphincter MuscleOutras ciências médicasOther medical sciencesEffects of ETB receptor stimulation and its subcellular pathways were evaluated in carbachol pre-contracted rabbit iris sphincter muscles (n=51). ETB stimulation with sarafotoxin (SRTX-c; 10(-10)-10(-6) M) was tested in the absence (n=7) or presence of 10(-5) M of: BQ-788 (ETB2 receptor antagonist; n=6), L-NA (NOS inhibitor; n=7) or indomethacin (cyclooxygenase inhibitor; n=10). Effects of ETB stimulation by endothelin-1 (ET-1; 10-(10)-10(-7) M) in the presence of an ETA receptor antagonist (BQ-123; 10(-5) M; n=7) and of ETB1 stimulation by IRL-1620 (10-(10)-10(-7) M; n=7) were also tested. Finally, the effects of SRTX-c (10(-9)-10(-7) M) in electric field stimulation (EFS) contraction were evaluated (n=7). ETB receptor stimulation by SRTX-c or ET-1 in presence of BQ-123 promoted a concentration-dependent relaxation of the rabbit iris sphincter muscle by 10.8 +/- 2.0 % and 9.4 +/- 1.8 %, respectively. This effect was blocked by BQ-788 (-2.3 +/- 2.0 %), L-NA (4.5 +/- 2.3 %) or indomethacin (2.3 +/- 2.9 %). Selective ETB1 stimulation by IRL-1620 did not relax the iris sphincter muscle (0.9 +/- 5.4 %). EFS elicited contraction was not altered by SRTX-c. In conclusion, ETB receptor stimulation relaxes the carbachol precontracted iris sphincter muscle, an effect that is mediated by the ETB2 receptor subtype, through NO and the release of prostaglandins.20092009-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/10216/9207eng0862-8408Rocha-Sousa ASaraiva JAlves-Faria PFalcão-Reis FLeite-Moreira AFinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-29T13:17:37Zoai:repositorio-aberto.up.pt:10216/9207Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T23:37:43.815348Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
ETB2 Receptor Subtype Stimulation Relaxes the Iris Sphincter Muscle |
title |
ETB2 Receptor Subtype Stimulation Relaxes the Iris Sphincter Muscle |
spellingShingle |
ETB2 Receptor Subtype Stimulation Relaxes the Iris Sphincter Muscle Rocha-Sousa A Outras ciências médicas Other medical sciences |
title_short |
ETB2 Receptor Subtype Stimulation Relaxes the Iris Sphincter Muscle |
title_full |
ETB2 Receptor Subtype Stimulation Relaxes the Iris Sphincter Muscle |
title_fullStr |
ETB2 Receptor Subtype Stimulation Relaxes the Iris Sphincter Muscle |
title_full_unstemmed |
ETB2 Receptor Subtype Stimulation Relaxes the Iris Sphincter Muscle |
title_sort |
ETB2 Receptor Subtype Stimulation Relaxes the Iris Sphincter Muscle |
author |
Rocha-Sousa A |
author_facet |
Rocha-Sousa A Saraiva J Alves-Faria P Falcão-Reis F Leite-Moreira AF |
author_role |
author |
author2 |
Saraiva J Alves-Faria P Falcão-Reis F Leite-Moreira AF |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Rocha-Sousa A Saraiva J Alves-Faria P Falcão-Reis F Leite-Moreira AF |
dc.subject.por.fl_str_mv |
Outras ciências médicas Other medical sciences |
topic |
Outras ciências médicas Other medical sciences |
description |
Effects of ETB receptor stimulation and its subcellular pathways were evaluated in carbachol pre-contracted rabbit iris sphincter muscles (n=51). ETB stimulation with sarafotoxin (SRTX-c; 10(-10)-10(-6) M) was tested in the absence (n=7) or presence of 10(-5) M of: BQ-788 (ETB2 receptor antagonist; n=6), L-NA (NOS inhibitor; n=7) or indomethacin (cyclooxygenase inhibitor; n=10). Effects of ETB stimulation by endothelin-1 (ET-1; 10-(10)-10(-7) M) in the presence of an ETA receptor antagonist (BQ-123; 10(-5) M; n=7) and of ETB1 stimulation by IRL-1620 (10-(10)-10(-7) M; n=7) were also tested. Finally, the effects of SRTX-c (10(-9)-10(-7) M) in electric field stimulation (EFS) contraction were evaluated (n=7). ETB receptor stimulation by SRTX-c or ET-1 in presence of BQ-123 promoted a concentration-dependent relaxation of the rabbit iris sphincter muscle by 10.8 +/- 2.0 % and 9.4 +/- 1.8 %, respectively. This effect was blocked by BQ-788 (-2.3 +/- 2.0 %), L-NA (4.5 +/- 2.3 %) or indomethacin (2.3 +/- 2.9 %). Selective ETB1 stimulation by IRL-1620 did not relax the iris sphincter muscle (0.9 +/- 5.4 %). EFS elicited contraction was not altered by SRTX-c. In conclusion, ETB receptor stimulation relaxes the carbachol precontracted iris sphincter muscle, an effect that is mediated by the ETB2 receptor subtype, through NO and the release of prostaglandins. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009 2009-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://hdl.handle.net/10216/9207 |
url |
https://hdl.handle.net/10216/9207 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0862-8408 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799135690239246336 |