Abstract:
:Prolonged or repeated agonist activation of G-protein-coupled receptors (GPCRs) initiates their desensitization and internalization, rendering them unresponsive to agonist activation. We analyzed how gangliosides and chondroitin sulfate affect B2 bradykinin (BK) receptors (B2Rs). Gangliosides and chondroitin sulfate did not stimulate intracellular Ca(2+) release from B2R-expressing CHO-K1 cells, but repeated exposure desensitized B2Rs to BK stimulation. Microscopic observation of DsRed-fused B2Rs revealed that several gangliosides and chondroitin sulfate C (CSC) effectively internalized B2Rs. Ganglioside-CSC treatment of B2R mutant-expressing cells failed to desensitize and internalize the mutant receptors. As this mutant lacks the first extracellular domain and cannot activate GPCR kinase (GRK), gangliosides and CSC likely initiate B2R desensitization and endocytosis through GRK-mediated B2R phosphorylation.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Shimazaki A,Nakagawa T,Mitoma J,Higashi Hdoi
10.1016/j.bbrc.2012.02.142subject
Has Abstractpub_date
2012-03-30 00:00:00pages
193-8issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(12)00401-9journal_volume
420pub_type
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