Volume 10, Issue 2 (Vol.10 No.2 Jul 2021)                   rbmb.net 2021, 10(2): 314-326 | Back to browse issues page

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Guimarães-Nobre C C, Mendonça-Reis E, Passinho-da-Costa L, Miranda-Alves L, Berto-Junior C. Signaling Pathway in the Osmotic Resistance Induced by Angiotensin II AT2 Receptor Activation in Human Erythrocytes. rbmb.net. 2021; 10 (2) :314-326
URL: http://rbmb.net/article-1-667-en.html
Grupo de Pesquisa em Fisiologia Eritróide - GPFisEri, Universidade Federal do Rio de Janeiro, Campus Macaé, Brazil & Laboratório de Endocrinologia Experimental- LEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil & Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil & Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Campus Macaé, Brazil.
Abstract:   (947 Views)
Background: Angiotensin II regulates blood volume via AT1 (AT1R) and AT2 (AT2R) receptors. As cell integrity is an important feature of mature erythrocyte, we sought to evaluate, in vitro, whether Angiotensin II modulates resistance to hemolysis and the signaling pathway involved.

Methods: Human blood samples were collected and hemolysis assay and angiotensin II signaling pathway profiling in erythrocytes were done.

Results: Hemolysis assay created a hemolysis curve in presence of Ang II in several concentrations (10-6 M, 10-8 M, 10-10 M, 10-12 M). Angiotensin II demonstrated protective effect, both in osmotic stressed and physiological situations, by reducing hemolysis in NaCl 0.4% and 0.9%. By adding receptors antagonists (losartan, AT1R antagonist and PD 123319, AT2R antagonist) and/or signaling modulators for AMPK, Akt/PI3K, p38 and PKC we showed the protective effect was enhanced with losartan and abolished with PD 123319. Also, we showed activation of PKC as well as PI3K/Akt pathways in this system.

Conclusions: Briefly, Ang II protects human erythrocytes from hypo-osmotic conditions-induced hemolysis by activating AT2 receptors and triggering both the intracellular pathways.
Full-Text [PDF 347 kb]   (430 Downloads)    
Type of Article: Original Article | Subject: Cell Biology
Received: 2021/03/3 | Accepted: 2021/04/7 | Published: 2021/08/26

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