Caged ligands to study the role of intracellular GPCRs

Tadevosyan, Artavazd; Villeneuve, Louis R; Fournier, Alain; Chatenet, David; Nattel, Stanley; Allen, Bruce G (2015). Caged ligands to study the role of intracellular GPCRs Methods , vol. 92 . p. 72-77. DOI: 10.1016/j.ymeth.2015.07.005.

Prévisualisation

PDF - Version acceptée Télécharger (759kB) | Prévisualisation

Résumé

La transcription des symboles et des caractères spéciaux utilisés dans la version originale de ce résumé n’a pas été possible en raison de limitations techniques. La version correcte de ce résumé peut être lue à l'adresse URL du DOI.

The symbols and special characters used in the original abstract could not be transcribed due to technical problems. Please use the URL address of the DOI to read the abstract.

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 Ca2+ ([Ca2+]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:	29 août 2016 21:06
Dernière modification:	29 août 2016 21:06
URI:	http://espace.inrs.ca/id/eprint/3261

Actions (Identification requise)

Modifier la notice