Cross-talking between lymphocytes and platelets and its regulation by nitric oxide and peroxynitrite in physiological condition and endotoxemia.
Life Sci
; 172: 2-7, 2017 Mar 01.
Article
em En
| MEDLINE
| ID: mdl-28017682
ABSTRACT
AIMS:
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. MAINMETHODS:
Lymphocytes and platelet-rich plasma (PRP) were obtained from rat arterial blood. Platelets (1.2×108platelets/ml) were incubated with lymphocytes (0.8×106cells/ml) in the presence or not of LPS (100µg/ml), after which ADP (5µM)-induced platelet aggregation was carried out. KEYFINDINGS:
Lymphocytes inhibited by 51% the platelet aggregation, which was significantly prevented by the non-selective NO inhibitor l-NAME (300µM) or the selective iNOS inhibitor 1400W (100µM), as well as by the soluble guanylyl cyclase (sGC) inhibitor ODQ (10µM). 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 6h. 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 1400W, but rather unaffected by ODQ. The peroxynitrite (ONOO-) scavenger -(-)epigallocatechin gallate (ECG, 100µM) 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.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Plaquetas
/
Linfócitos
/
Endotoxemia
/
Ácido Peroxinitroso
/
Óxido Nítrico
Limite:
Animals
Idioma:
En
Revista:
Life Sci
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Brasil