Abstract:
:Endothelin-1 acts as a potent autocrine and paracrine mediator in the kidney. Glomeruli and renal arterioles also express functional thrombin receptors which mediate the cellular effects of thrombin. Using the binding on glomerular epithelial cells of 125I-labeled ATAP2, a monoclonal antibody raised against the functional thrombin receptor, we demonstrate here that endothelin-1 induces thrombin receptor internalization in a dose- and a time-dependent manner. The maximal effect is observed at 10(-7) M endothelin-1 corresponding to internalization of approximately 25% of thrombin receptors. It is maximal at 20 min and persists for at least 24 h. This effect is mediated by the endothelin receptor subtype A (ETA), and involves a pertussis toxin-sensitive G-protein and protein kinase C activation. Endothelin-1 does not induce thrombin receptor degradation nor change in thrombin receptor mRNA level after 2 h and 24 h of incubation. These results indicate that partial heterologous internalization of the functional thrombin receptor is induced by endothelin-1.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Chen X,Berrou J,Nguyen G,Sraer JD,Rondeau Edoi
10.1006/bbrc.1995.2796subject
Has Abstractpub_date
1995-12-14 00:00:00pages
445-51issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(85)72796-9journal_volume
217pub_type
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