Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/326247
Type: Artigo
Title: Cross-talking Between Lymphocytes And Platelets And Its Regulation By Nitric Oxide And Peroxynitrite In Physiological Condition And Endotoxemia
Author: Almeida Cardelli
Nadia J.; Elisa Lopes-Pires
M.; Bonfitto
Pedro H. L.; Ferreira
Heloisa H.; Antunes
Edson; Marcondes
Sisi
Abstract: Cross-talk between platelets and lymphocytes may play a role in different pathological conditions like sepsis. This study aimed to investigate the effect of lymphocytes on platelet aggregation in lipopolysaccharide (LPS)-stimulated and non-stimulated cells. Main methods: Lymphocytes and platelet-rich plasma (PRP) were obtained from rat arterial blood. Platelets (1.2 x 10(8) platelets/ml) were incubated with lymphocytes (0.8 x 10(6) cells/ml) in the presence or not of LPS (100 mu g/ml), after which ADP (5 mu M)-induced platelet aggregation was carried out. Key findings: Lymphocytes inhibited by 51% the platelet aggregation, which was significantly prevented by the non-selective NO inhibitor L-NAME (300 mu M) or the selective iNOS inhibitor 1400 W (100 mu M), as well as by the soluble guanylyl cyclase (sGC) inhibitor ODQ (10 mu M). The platelet inhibition by lymphocytes was accompanied by 2-fold increase of intraplatelet cGMP levels. Next, lymphocytes and platelets were co-incubated with LPS for 6 h. In LPS-treated cells, lymphocytes produced a larger inhibition of platelet aggregation (62%), despite the same elevation of cGMP levels (2.2-fold increase). This inhibitory effect was prevented by L-NAME and 1400 W, but rather unaffected by ODQ. The peroxynitrite (ONOO-) scavenger -(-)epigallocatechin gallate (ECG, 100 mu M) abolished the inhibition by lymphocytes on platelet aggregation in LPS-treated cells, but not in non-treated cells. Significance: Our results show that lymphocytes act to inhibit platelet aggregation via iNOS-derived NO release and cGMP generation. In presence of LPS, ONOO- production accounts for the platelet inhibition. (C) 2016 Published by Elsevier Inc.
Subject: -(-)epigallocatechin Gallate
Peroxynitrite
Soluble Guanylyl Cyclase
Editor: Pergamon-Elsevier Science LTD
Oxford
Rights: fechado
Identifier DOI: 10.1016/j.lfs.2016.12.013
Address: http://www-sciencedirect-com.ez88.periodicos.capes.gov.br/science/article/pii/S0024320516307081
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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