Relative affinity of angiotensin peptides and novel ligands at AT(1) and AT(2) receptors

Bosnyak, Sanja, Jones, Emma S., Christopoulos, Arthur, Aguilar, Marie-Isabel, Thomas, Walter G. and Widdop, Robert E. (2011) Relative affinity of angiotensin peptides and novel ligands at AT(1) and AT(2) receptors. Clinical Science, 121 7: 297-303. doi:10.1042/CS20110036

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Author Bosnyak, Sanja
Jones, Emma S.
Christopoulos, Arthur
Aguilar, Marie-Isabel
Thomas, Walter G.
Widdop, Robert E.
Title Relative affinity of angiotensin peptides and novel ligands at AT(1) and AT(2) receptors
Journal name Clinical Science   Check publisher's open access policy
ISSN 0143-5221
Publication date 2011-10
Sub-type Article (original research)
DOI 10.1042/CS20110036
Volume 121
Issue 7
Start page 297
End page 303
Total pages 7
Place of publication London, England, U.K.
Publisher Portland Press
Collection year 2012
Language eng
Formatted abstract
AT1R (angiotensin type 1 receptor) and AT2R (angiotensin type 2 receptor) are well known to be involved in the complex cardiovascular actions of AngII (angiotensin II). However, shorter peptide fragments of AngII are thought to have biological activity in their own right and elicit effects that oppose those mediated by AngII. In the present study, we have used HEK (human embryonic kidney)-293 cells stably transfected with either AT1R or AT2R to perform a systematic analysis of binding affinities of all the major angiotensin peptides. Additionally, we tested the novel AT2R agonist Compound 21, as well as the MasR (Mas receptor) agonist and antagonist AVE0991 and A-779 respectively, for their ability to bind to AT1R or AT2R. Candesartan, CGP42214 and PD123319 were used as reference compounds. Binding studies using 125I-[Sar1Ile8]AngII on the AT1R-transfected HEK-293 cells revealed only AngII, AngIII [angiotensin III; angiotensin-(2-8)] and candesartan to have high affinity for AT1R. In the AT2R-transfected HEK-293 cells, competition for 125I-[Sar1Ile8]AngII binding was observed for all ligands except candesartan, AVE0991 and A-779, the latter two compounds having negligible affinity at either AT1R or AT2R. The rank order of affinity of ligands at AT2R was CGP42112>AngII≥AngIII>Compound 21≥PD123319≫AngIV [angiotensin IV; angiotensin-(3-8)]>Ang-(1-7) [angiotensin-(1-7)]. Of note, although AngIV and Ang-(1-7) exhibited only modest affinity at AT2R compared with AngII, these two angiotensin peptides, together with AngIII, had substantial AT2R selectivity over AT1R. Collectively, our results suggest that shorter angiotensin peptides can act as endogenous ligands at AT2R.
Keyword Angiotensin II
Angiotensin III
Compound 21
Radioligand assay
Spontaneously Hypertensive-Rats
Experimental Ischemic-Stroke
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biomedical Sciences Publications
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