Long- and short-term effects of androgens in human umbilical artery smooth muscle

Detalhes bibliográficos
Autor(a) principal: Saldanha, Paulo
Data de Publicação: 2013
Outros Autores: Cairrão, Elisa, Baptista, Cláudio, Verde, Ignacio
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.6/7639
Resumo: The aim of the present study was to determine the effects of androgens in the regulation of human umbilical artery (HUA) contractility. The short-term effects of testosterone on the tone of the HUA were investigated, as were the long-term effects of dihydrotestosterone (DHT) on the expression of some proteins involved in the contractile process. Endothelium-denuded HUA were treated for 24 h with DHT (2 μmol/L) or the vehicle control (ethanol) to analyse the genomic effects of androgens. Twenty-four hour treatment of HUA with DHT increased the mRNA expression of the β(1)-subunit of the large-conductance Ca(2+)-activated (BK(Ca)) channel and decreased expression of the α-subunit of L-type calcium channels. In organ bath studies, testosterone (1-100 μmol/L) produced similar relaxant responses in DHT- and vehicle-treated HUA rings precontracted with 5-HT, histamine and KCl. However, the relaxation response obtained by the combined application of testosterone (100 μmol/L) and nifedipine (10 μmol/L) was significantly greater in DHT- compared with vehicle-treated HUA. The results indicate that the rapid vasorelaxant effects of testosterone that are dependent on both BK(Ca) and voltage-sensitive potassium (K(V)) channel activity in control arteries become dependent solely on K(V) channel activity in DHT-treated HUA. Thus, the present study reveals the importance of the investigation of both the short- and long-term effects of androgens in human arteries.
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spelling Long- and short-term effects of androgens in human umbilical artery smooth muscleAndrogensCalcium channelsPotassium channelsSmooth muscle cellVasorelaxationThe aim of the present study was to determine the effects of androgens in the regulation of human umbilical artery (HUA) contractility. The short-term effects of testosterone on the tone of the HUA were investigated, as were the long-term effects of dihydrotestosterone (DHT) on the expression of some proteins involved in the contractile process. Endothelium-denuded HUA were treated for 24 h with DHT (2 μmol/L) or the vehicle control (ethanol) to analyse the genomic effects of androgens. Twenty-four hour treatment of HUA with DHT increased the mRNA expression of the β(1)-subunit of the large-conductance Ca(2+)-activated (BK(Ca)) channel and decreased expression of the α-subunit of L-type calcium channels. In organ bath studies, testosterone (1-100 μmol/L) produced similar relaxant responses in DHT- and vehicle-treated HUA rings precontracted with 5-HT, histamine and KCl. However, the relaxation response obtained by the combined application of testosterone (100 μmol/L) and nifedipine (10 μmol/L) was significantly greater in DHT- compared with vehicle-treated HUA. The results indicate that the rapid vasorelaxant effects of testosterone that are dependent on both BK(Ca) and voltage-sensitive potassium (K(V)) channel activity in control arteries become dependent solely on K(V) channel activity in DHT-treated HUA. Thus, the present study reveals the importance of the investigation of both the short- and long-term effects of androgens in human arteries.uBibliorumSaldanha, PauloCairrão, ElisaBaptista, CláudioVerde, Ignacio2019-11-28T17:01:41Z2013-032013-03-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.6/7639eng10.1111/1440-1681.12047metadata only accessinfo: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:RCAAP2023-12-15T09:47:09Zoai:ubibliorum.ubi.pt:10400.6/7639Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:48:06.821094Repositório 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 Long- and short-term effects of androgens in human umbilical artery smooth muscle
title Long- and short-term effects of androgens in human umbilical artery smooth muscle
spellingShingle Long- and short-term effects of androgens in human umbilical artery smooth muscle
Saldanha, Paulo
Androgens
Calcium channels
Potassium channels
Smooth muscle cell
Vasorelaxation
title_short Long- and short-term effects of androgens in human umbilical artery smooth muscle
title_full Long- and short-term effects of androgens in human umbilical artery smooth muscle
title_fullStr Long- and short-term effects of androgens in human umbilical artery smooth muscle
title_full_unstemmed Long- and short-term effects of androgens in human umbilical artery smooth muscle
title_sort Long- and short-term effects of androgens in human umbilical artery smooth muscle
author Saldanha, Paulo
author_facet Saldanha, Paulo
Cairrão, Elisa
Baptista, Cláudio
Verde, Ignacio
author_role author
author2 Cairrão, Elisa
Baptista, Cláudio
Verde, Ignacio
author2_role author
author
author
dc.contributor.none.fl_str_mv uBibliorum
dc.contributor.author.fl_str_mv Saldanha, Paulo
Cairrão, Elisa
Baptista, Cláudio
Verde, Ignacio
dc.subject.por.fl_str_mv Androgens
Calcium channels
Potassium channels
Smooth muscle cell
Vasorelaxation
topic Androgens
Calcium channels
Potassium channels
Smooth muscle cell
Vasorelaxation
description The aim of the present study was to determine the effects of androgens in the regulation of human umbilical artery (HUA) contractility. The short-term effects of testosterone on the tone of the HUA were investigated, as were the long-term effects of dihydrotestosterone (DHT) on the expression of some proteins involved in the contractile process. Endothelium-denuded HUA were treated for 24 h with DHT (2 μmol/L) or the vehicle control (ethanol) to analyse the genomic effects of androgens. Twenty-four hour treatment of HUA with DHT increased the mRNA expression of the β(1)-subunit of the large-conductance Ca(2+)-activated (BK(Ca)) channel and decreased expression of the α-subunit of L-type calcium channels. In organ bath studies, testosterone (1-100 μmol/L) produced similar relaxant responses in DHT- and vehicle-treated HUA rings precontracted with 5-HT, histamine and KCl. However, the relaxation response obtained by the combined application of testosterone (100 μmol/L) and nifedipine (10 μmol/L) was significantly greater in DHT- compared with vehicle-treated HUA. The results indicate that the rapid vasorelaxant effects of testosterone that are dependent on both BK(Ca) and voltage-sensitive potassium (K(V)) channel activity in control arteries become dependent solely on K(V) channel activity in DHT-treated HUA. Thus, the present study reveals the importance of the investigation of both the short- and long-term effects of androgens in human arteries.
publishDate 2013
dc.date.none.fl_str_mv 2013-03
2013-03-01T00:00:00Z
2019-11-28T17:01:41Z
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