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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2017.tde-19012017-145956
Document
Author
Full name
Carolina Midori Hashimoto
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Akamine, Eliana Hiromi (President)
Chaves, Maria Luiza Morais Barreto de
Hirata, Aparecida Emiko
Title in Portuguese
Tratamento crônico com losartana corrige a disfunção do tecido adiposo perivascular em camundongos obesos.
Keywords in Portuguese
Obesidade
Reatividade vascular
Sistema renina-angiotensina-aldosterona
Tecido adiposo perivascular
Abstract in Portuguese
O tecido adiposo perivascular (PVAT) da aorta torácica (AT) possui ação anticontrátil (AC). O PVAT da AT e das artérias mesentéricas de resistência (AM) possuem diferentes características. Na obesidade ocorre expansão do PVAT. Nós avaliamos a modulação da contração pelo PVAT da AT e AM em camundongos controles (CT) e obesos (OB) e a participação do sistema renina-angiotensina (SRA), por meio do tratamento com antagonista do receptor AT1 (BRA). PVAT da AT e AM apresentaram ação AC. Ação AC do PVAT das AM, mas não da TA, foi abolida no grupo OB. BRA resgatou a ação AC do PVAT das AM no grupo OB, que foi abolida pelo antagonismo do receptor AT2 e pela inibição da óxido nítrico (NO) sintase (NOS). Em AM, a expressão dos receptores AT1 e AT2 não foi modificada e da NOS endotelial foi aumentada em AM e reduzida no PVAT da AM no grupo OB. BRA aumentou a expressão da eNOS no PVAT das AM nos dois grupos. Assim, concluímos que a obesidade induz disfunção do PVAT de AM e há envolvimento do SRA. BRA corrige a função do PVAT de AM por mecanismo dependente do receptor AT2 e NO.
Title in English
Chronic treatment with losartan corrects the dysfunction of perivascular adipose tissue in obese mice.
Keywords in English
Obesity
Perivascular adipose tissue
Renin-angiotensin-aldosterone system
Vascular reactivity
Abstract in English
The perivascular adipose tissue (PVAT) of thoracic aorta (TA) has an anticontractile (AC) action. TA and resistance mesenteric arteries (MA) PVAT have different characteristics. Expansion of PVAT occurs in obesity. We evaluated the modulation of contraction by PVAT of TA and MA in control (CT) and obese (OB) mice and the participation of the renin-angiotensin system (RAS), by treating mice with AT1 receptor antagonist (ARB). PVAT of both TA and MA showed an AC action. The AC action of MA PVAT, but of TA PVAT, was abolished in the OB group. ARB recovered the AC action of MA PVAT in OB group, which was abolished by both AT2 receptor antagonism and nitric oxide (NO) synthase (NOS) inhibition. In MA, the expression of AT1 and AT2 receptors was not changed and the expression of eNOS was increased in MA and reduced in MA PVAT of OB group. ARB increased the expression of eNOS in MA PVAT in both CT and OB groups. In conclusion, obesity induced MA PVAT dysfunction, in which RAS is involved. ARB recovered the MA PVAT function by mechanisms that depend on the AT2 receptor and NO.
 
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Publishing Date
2017-01-19
 
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