Dépôt numérique

Caged ligands to study the role of intracellular GPCRs

Tadevosyan, Artavazd; Villeneuve, Louis R.; Fournier, Alain; Chatenet, David; Nattel, Stanley et Allen, Bruce G. (2016). Caged ligands to study the role of intracellular GPCRs Methods , vol. 92 . pp. 72-77. DOI: 10.1016/j.ymeth.2015.07.005.

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In addition to cell surface membranes, numerous G protein-coupled receptors (GPCRs) are located on intracellular membranes including the nuclear envelope. Although the role of numerous GPCRs at the cell surface has been well characterized, the physiological function of these same receptors located on intracellular membranes remains to be determined. Here, we employ a novel caged Ang-II analog, cAng-II, to compare the effects of the activation of cell surface versus intracellular angiotensin receptors in intact cardiomyocytes. When added extracellularly to HEK 293 cells, Ang-II and photolysed cAng-II increased ERK1/2 phosphorylation (via AT1R) and cGMP production (AT2R). In contrast unphotolysed cAng-II did not. Cellular uptake of cAng-II was 6-fold greater than that of Ang-II and comparable to the HIV TAT(48-60) peptide. Intracellular photolysis of cAng-II induced an increase in nucleoplasmic Ca(2+) ([Ca(2+)]n) that was greater than that induced by extracellular application of Ang-II. We conclude that cell-permeable ligands that can access intracellular GPCRs may evoke responses distinct from those with access restricted to the same receptor located on the cell surface.

Type de document: Article
Mots-clés libres: Angiotensin II; Angiotensin receptors; Intracrine signalling; Live cell imaging; Nuclear GPCR
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 20 févr. 2019 16:19
Dernière modification: 20 févr. 2019 16:19
URI: https://espace.inrs.ca/id/eprint/4592

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