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. 2001 May 1;355(Pt 3):741–750. doi: 10.1042/bj3550741

Agonist-promoted trafficking of human bradykinin receptors: arrestin- and dynamin-independent sequestration of the B2 receptor and bradykinin in HEK293 cells.

M E Lamb 1, W F De Weerd 1, L M Leeb-Lundberg 1
PMCID: PMC1221790  PMID: 11311137

Abstract

In this study, we analysed the agonist-promoted trafficking of human B(2) (B(2)R) and B(1) (B(1)R) bradykinin (BK) receptors using wild-type and green fluorescent protein (GFP)-tagged receptors in HEK293 cells. B(2)R was sequestered to a major extent upon exposure to BK, as determined by the loss of cell-surface B(2)R using radioligand binding and by imaging of B(2)R-GFP using laser-scanning confocal fluorescence microscopy. Concurrent BK sequestration was revealed by the appearance of acid-resistant specific BK receptor binding. The same techniques showed that B(1)R was sequestered to a considerably lesser extent upon binding of des-Arg(10)-kallidin. B(2)R sequestration was rapid (half-life approximately 5 min) and reached a steady-state level that was significantly lower than that of BK sequestration. B(2)R sequestration was minimally inhibited by K44A dynamin (22.4+/-3.7%), and was insensitive to arrestin-(319-418), which are dominant-negative mutants of dynamin I and beta-arrestin respectively. Furthermore, the B(2)R-mediated sequestration of BK was completely insensitive to both mutants, as was the association of BK with a caveolae-enriched fraction of the cells. On the other hand, agonist-promoted sequestration of the beta(2)-adrenergic receptor was dramatically inhibited by K44A dynamin (81.2+/-16.3%) and by arrestin-(319-418) (36.9+/-4.4%). Our results show that B(2)R is sequestered to a significantly greater extent than is B(1)R upon agonist treatment in HEK293 cells. Furthermore, B(2)R appears to be recycled in the process of sequestering BK, and this process occurs in a dynamin- and beta-arrestin-independent manner and, at least in part, involves caveolae.

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Selected References

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