BACKGROUND: Platelets express two ADP receptors namely P2Y1 and P2Y12 that regulate ADP and other agonists-induced platelet aggregation. P2Y1 receptor activation causes platelet shape change while P2Y12 receptor activation induces platelet aggregation. Previously, anti-aggregatory effects of ATP on ADP-induced and pro-aggregatory effects on epinephrine-induced platelet aggregation have been reported. However, the effects of other nucleoside triphosphates on platelet aggregation have never been described. The aim of the present study was to characterise the effects of nucleoside triphosphates (ATP, UTP, GTP, and CTP) on agonist-induced platelet aggregation. METHODS: The experiments were performed on platelet rich plasma freshly isolated from blood donated by healthy human volunteers. RESULTS: All the nucleoside triphosphates tested inhibited ADP- and collagen-induced platelet aggregation in a concentration-dependent manner with a rank order of potency, 2MeSATP >ATP ≥ α,β,methyleneATP>UTP >>CTP ≥ GTP. The IC50 values against ADP (10 μM)-induced platelet aggregation were 0.039 ± 0.013, 18 ± 7, 25 ± 6, 32 ± 9, 360 ± 130, and 400 ± 160 μM, respectively. Low concentrations of ATP induced platelet shape change which was due to contaminating ADP. However, higher concentrations antagonised ADP and MRS2365-induced platelet shape change. The ATP analogue α,β,methyleneATP and CTP but not UTP and GTP also antagonised ADP-induced platelet shape change. Similarly, low ATP concentrations potentiated epinephrine-induced platelet aggregation that was abolished by P2Y1 antagonist MRS2500 suggesting P2Y1 receptor activation due to contaminating ADP. Higher ATP concentrations, α,β,methyleneATP, UTP, CTP, and GTP antagonised epinephrine-induced platelet aggregation. CONCLUSION: Thus, the data demonstrate nucleoside triphosphates in general act as P2Y12 receptor antagonists and antagonise ADP-, collagen-, and epinephrine-induced platelet aggregation.
BACKGROUND: Platelets express two ADP receptors namely P2Y1 and P2Y12 that regulate ADP and other agonists-induced platelet aggregation. P2Y1 receptor activation causes platelet shape change while P2Y12 receptor activation induces platelet aggregation. Previously, anti-aggregatory effects of ATP on ADP-induced and pro-aggregatory effects on epinephrine-induced platelet aggregation have been reported. However, the effects of other nucleoside triphosphates on platelet aggregation have never been described. The aim of the present study was to characterise the effects of nucleoside triphosphates (ATP, UTP, GTP, and CTP) on agonist-induced platelet aggregation. METHODS: The experiments were performed on platelet rich plasma freshly isolated from blood donated by healthy human volunteers. RESULTS: All the nucleoside triphosphates tested inhibited ADP- and collagen-induced platelet aggregation in a concentration-dependent manner with a rank order of potency, 2MeSATP >ATP ≥ α,β,methyleneATP>UTP >>CTP ≥ GTP. The IC50 values against ADP (10 μM)-induced platelet aggregation were 0.039 ± 0.013, 18 ± 7, 25 ± 6, 32 ± 9, 360 ± 130, and 400 ± 160 μM, respectively. Low concentrations of ATP induced platelet shape change which was due to contaminating ADP. However, higher concentrations antagonised ADP and MRS2365-induced platelet shape change. The ATP analogue α,β,methyleneATP and CTP but not UTP and GTP also antagonised ADP-induced platelet shape change. Similarly, low ATP concentrations potentiated epinephrine-induced platelet aggregation that was abolished by P2Y1 antagonist MRS2500 suggesting P2Y1 receptor activation due to contaminating ADP. Higher ATP concentrations, α,β,methyleneATP, UTP, CTP, and GTP antagonised epinephrine-induced platelet aggregation. CONCLUSION: Thus, the data demonstrate nucleoside triphosphates in general act as P2Y12 receptor antagonists and antagonise ADP-, collagen-, and epinephrine-induced platelet aggregation.
Authors: Theodore E Liston; Sonja Hinz; Christa E Müller; Deborah M Holstein; Jay Wendling; Roger J Melton; Mary Campbell; William S Korinek; R Rama Suresh; Dane A Sethre-Hofstad; Zhan-Guo Gao; Dilip K Tosh; Kenneth A Jacobson; James D Lechleiter Journal: Purinergic Signal Date: 2020-10-31 Impact factor: 3.765
Authors: Raphael De Souza Vasconcellos; Christiane Mariotini-Moura; Rodrigo Saar Gomes; Tiago Donatelli Serafim; Rafaela de Cássia Firmino; Matheus Silva E Bastos; Felipe Freitas de Castro; Claudia Miranda de Oliveira; Lucas Borges-Pereira; Anna Cláudia Alves de Souza; Ronny Francisco de Souza; Gabriel Andres Tafur Gómez; Aimara da Costa Pinheiro; Talles Eduardo Ferreira Maciel; Abelardo Silva-Júnior; Gustavo Costa Bressan; Márcia Rogéria Almeida; Munira Muhammad Abdel Baqui; Luís Carlos Crocco Afonso; Juliana Lopes Rangel Fietto Journal: PLoS Negl Trop Dis Date: 2014-11-13
Authors: Muhammad Aslam; Dursun Gündüz; Christian Troidl; Jacqueline Heger; Christian W Hamm; Rainer Schulz Journal: Int J Mol Sci Date: 2021-01-26 Impact factor: 5.923