Nonpeptide AVE 0991 is an angiotensin-(1-7) receptor Mas agonist in the mouse kidney.
It has been described recently that the nonpeptide AVE 0991 (AVE) mimics the effects of angiotensin-(1-7) [Ang-(1-7)] in bovine endothelial cells. In this study, we tested the possibility that AVE is an agonist of the Ang-(1-7) receptor Mas, in vitro and in vivo. In water-loaded C57BL/6 mice, AVE (0.58 nmol/g body weight) produced a significant reduction in urinary volume (0.06+/-0.03 mL/60 min [n=9] versus 0.27+/-0.05 [n=9]; P<0.01), associated with an increase in urinary osmolality. The Ang-(1-7) antagonist A-779 completely blocked the antidiuretic effect of AVE. As observed previously for Ang-(1-7), the antidiuretic effect of AVE after water load was blunted in Mas-knockout mice (0.37+/-0.10 mL/60 min [n=9] versus 0.27+/-0.03 mL/60 min [n=11] AVE-treated mice). In vitro receptor autoradiography in C57BL/6 mice showed that the specific binding of 125I-Ang-(1-7) to mouse kidney slices was displaced by AVE, whereas no effects were observed in the binding of 125I-angiotensin II or 125I-angiotensin IV. Furthermore, AVE displaced the binding of 125I-Ang-(1-7) in Mas-transfected monkey kidney cells (COS) cells (IC50=4.75x10(-8) mol/L) and of rhodamine-Ang-(1-7) in Mas-transfected Chinese hamster ovary (CHO) cells. It also produced NO release in Mas-transfected CHO cells blocked by A-779 but not by angiotensin II type-1 (AT1) and AT2 antagonists. Contrasting with these data, the antidiuretic effect of AVE was totally blocked by AT2 antagonists and partially blocked (approximately 60%) by AT1 antagonists. The binding data, the results obtained in Mas-knockout mice and in Mas-transfected cells, show that AVE is a Mas receptor agonist. Our data also suggest the involvement of AT2/AT1-related mechanisms, including functional antagonism, oligomerization or cross-talk, in the renal responses to AVE.
Pinheiro
Sérgio Veloso Brant
SV
Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Brazil.
Simões e Silva
Ana Cristina
AC
Sampaio
Walkyria Oliveira
WO
de Paula
Renata Dutra
RD
Mendes
Elizabeth Pereira
EP
Bontempo
Elizabete Dias
ED
Pesquero
João Bosco
JB
Walther
Thomas
T
Alenina
Natalia
N
Bader
Michael
M
Bleich
Markus
M
Santos
Robson Augusto Souza
RA
D000803:Angiotensin I / Q000819:agonists*; D000818:Animals; D001794:Blood Pressure; D016466:CHO Cells; D019556:COS Cells; D002522:Chlorocebus aethiops; D006224:Cricetinae; D004231:Diuresis; D007093:Imidazoles / Q000494:pharmacology*; D007668:Kidney / Q000502:physiology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D010446:Peptide Fragments / Q000819:agonists*; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins; D011945:Receptors, Angiotensin / Q000819:agonists*; D043562:Receptors, G-Protein-Coupled; D014162:Transfection
C469726:AVE 0991; D007093:Imidazoles; D010446:Peptide Fragments; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins; D011945:Receptors, Angiotensin; D043562:Receptors, G-Protein-Coupled; D000803:Angiotensin I; C118790:angiotensin I (1-7)