β-estradiol effect on erythrocyte aggregation : a controlled in vitro study

Detalhes bibliográficos
Autor(a) principal: Gonçalves, Isabel
Data de Publicação: 2001
Outros Autores: Saldanha, Carlota, Martins e Silva, J.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/17773
Resumo: © 2001 – IOS Press. All rights reserved.
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spelling β-estradiol effect on erythrocyte aggregation : a controlled in vitro studyBeta-estradiol effect on erythrocyte aggregation : a controlled in vitro studyβ-estradiolErythrocyte aggregationMembrane fluidity© 2001 – IOS Press. All rights reserved.17β-estradiol as free radical scavengers is a steroid hormone, unionised and lipophilic at physiological pH. Fifteen to 35% of the total amount of steroids in the blood is transported by red blood cells that carry 17β-estradiol, both membrane-bound (two thirds) and in the cytoplasma (one third of the 17β-estradiol) being the erythrocytes responsible for 5–15% of sex hormone delivery to target tissues [1,2]. Its importance has been lately pointed out for its cardiovascular risk reduction in postmenopausal women [3] although the mechanism of this cardioprotective effect remain unclear. An antioxidant role as free radical scavengers has been demonstrated which could explain the protective role [4,5]. The work of Mc Manus et al. [6] did not support the role of oestrogens as antioxidants in vivo, besides the lower plasma hydroperoxide level determined four weeks after insertion of the estradiol implant. Previously data in primate have been shown that chronic 17β-estradiol supplementation decreased LDL accumulation in vivo [7]. Several studies on estrogen effects on the blood vessel wall are arising [8,9] and it was suggested previously an increasing production of nitric oxide induced by estrogen, that may contribute to the improvement in myocardial metabolic disfunction by increasing coronary blood flow [10]. An increase in blood flow in the peripheral arteries was verified after administration of hormone replacement therapy in women who had undergone surgical menopause [11]. So in what concerns the hemorreologic properties Coata et al. showed that low-dose triphasic contraceptives does not seem to affect blood viscosity [12] and in another study it was verified that the estrogen replacement therapy lowering plasma viscosity in a group of 23 women [13]. The effect of 17β-estradiol on membranes has been the aim of some studies focusing epithelial cell membranes that seemed to become more fluid [14]. Other studies, on microvilli, indicate that estradiol acts on the lipid composition of membranes, probably changing the phospholipids availability [15]. Moreover the membrane action of sex steroids on other elements of the erythroid line (reticulocytes) has been reported to be of different extent than the traditional nuclear action of steroids [16]. Jacobson et al. mentioned that steroid binding to membrane proteins is associated with short term cytophysiological events such as ion fluxes. However, they believe long-term genomic responses involving intracellular receptors follows another route determined by membrane lipid [17], which shows the relevance of the membrane properties and subsequently the hemorheological importance of estradiol in blood. Recently Levin’s group also showed that estrogen, via a signal transduction pathway governed by membrane receptors, could both rescue endothelial cells from a hypoxia induced death and promote new blood vessel formation [18]. As mentioned above the β-estradiol is transported in blood by erythrocyte in a membrane bound way so, it seems possible the occurrence of some erythrocyte functions and properties modifications in presence of estradiol. Therefore the aim of this study was to determine the 17β-estradiol effect on the hemorheological and biochemical properties of postmenopausal women erythrocytes.IOS PressRepositório da Universidade de LisboaGonçalves, IsabelSaldanha, CarlotaMartins e Silva, J.2015-03-23T11:01:22Z20012001-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/17773engClinical Hemorheology and Microcirculation 25 (2001) 127–1341386-0291http://iospress.metapress.com/content/8uq3c6lravjkme52/?p=71128bd238ef45d4b877e93eac1195b2&pi=4info: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:RCAAP2023-11-08T16:03:36Zoai:repositorio.ul.pt:10451/17773Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:37:32.263390Repositório 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 β-estradiol effect on erythrocyte aggregation : a controlled in vitro study
Beta-estradiol effect on erythrocyte aggregation : a controlled in vitro study
title β-estradiol effect on erythrocyte aggregation : a controlled in vitro study
spellingShingle β-estradiol effect on erythrocyte aggregation : a controlled in vitro study
Gonçalves, Isabel
β-estradiol
Erythrocyte aggregation
Membrane fluidity
title_short β-estradiol effect on erythrocyte aggregation : a controlled in vitro study
title_full β-estradiol effect on erythrocyte aggregation : a controlled in vitro study
title_fullStr β-estradiol effect on erythrocyte aggregation : a controlled in vitro study
title_full_unstemmed β-estradiol effect on erythrocyte aggregation : a controlled in vitro study
title_sort β-estradiol effect on erythrocyte aggregation : a controlled in vitro study
author Gonçalves, Isabel
author_facet Gonçalves, Isabel
Saldanha, Carlota
Martins e Silva, J.
author_role author
author2 Saldanha, Carlota
Martins e Silva, J.
author2_role author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Gonçalves, Isabel
Saldanha, Carlota
Martins e Silva, J.
dc.subject.por.fl_str_mv β-estradiol
Erythrocyte aggregation
Membrane fluidity
topic β-estradiol
Erythrocyte aggregation
Membrane fluidity
description © 2001 – IOS Press. All rights reserved.
publishDate 2001
dc.date.none.fl_str_mv 2001
2001-01-01T00:00:00Z
2015-03-23T11:01:22Z
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 http://hdl.handle.net/10451/17773
url http://hdl.handle.net/10451/17773
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Clinical Hemorheology and Microcirculation 25 (2001) 127–134
1386-0291
http://iospress.metapress.com/content/8uq3c6lravjkme52/?p=71128bd238ef45d4b877e93eac1195b2&pi=4
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.publisher.none.fl_str_mv IOS Press
publisher.none.fl_str_mv IOS Press
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
instname_str 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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