ArticleThe Biochemical journal1994
Different pathways for control of Na+/H+ exchange via activation of the thrombin receptor.
Article in The Biochemical journal, 1994. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed, 22 citations in OpenAlex.
- Ras activation in platelets after stimulation of the thrombin receptor, thromboxane A2 receptor or protein kinase C.The Biochemical journal · 1997Article
- Arachidonic acid activates a proton conductance pathway and the Na+/H+ exchanger in platelets.The Biochemical journal · 1996Article
- Regulation of platelet glycoprotein IIb/IIIa (integrin alpha IIB beta 3) function via the thrombin receptor.The Biochemical journal · 1995Article
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Authors and funding
3 authors.
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Abstract
The aim of the present study was to clarify the control of Na+/H+ exchange in platelets activated via the thrombin receptor. When human BCECF-loaded platelets were stimulated with the thrombin-receptor-activating peptide (TRAP; amino acid sequence SFLLRN), which activates the receptor independently of proteolysis, the cytosolic pH (pHi) rose from 7.13 +/- 0.04 (n = 6) to 7.27 +/- 0.04 (n = 5), followed by a rapid decrease to resting values. Trypsin, which cleaves the receptor, induced a rapid and irreversible rise in pHi to 7.31 +/- 0.06 (n = 5). gamma-Thrombin, which cleaves the receptor but is unable to bind to the hirudin-like domain, induced a slow and irreversible rise in pHi to 7.31 +/- 0.04 (n = 14). alpha-Thrombin, which cleaves the receptor and binds to its hirudin-like domain, induced a rapid and irreversible rise in pHi to 7.31 +/- 0.04 (n = 22). Changes in pHi induced by TRAP, trypsin, gamma- and alpha-thrombin were accompanied by similar changes in cytosolic Ca2+ concentration ([Ca2+]i) and 32P-pleckstrin, a substrate of protein kinase C (PKC). The separate chelation of Ca2+i (30 microM BAPTA-AM) or inhibition of PKC (1 microM staurosporine) induced about 50% inhibition of the pHi responses triggered by TRAP, trypsin, gamma- and alpha-thrombin, but the combination induced complete inhibition. Thus the different types of activation of the thrombin receptor control Na+/H+ exchange via the same mechanism. Binding of thrombin to the hirudin-like domain accelerates exchange activation, whereas proteolysis of the receptor is essential for a sustained increase in pHi.
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