RGD Reference Report - Renal angiotensin type 2 receptors mediate natriuresis via angiotensin III in the angiotensin II type 1 receptor-blocked rat. - Rat Genome Database

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Renal angiotensin type 2 receptors mediate natriuresis via angiotensin III in the angiotensin II type 1 receptor-blocked rat.

Authors: Padia, SH  Howell, NL  Siragy, HM  Carey, RM 
Citation: Padia SH, etal., Hypertension. 2006 Mar;47(3):537-44. Epub 2005 Dec 27.
RGD ID: 1582118
Pubmed: PMID:16380540   (View Abstract at PubMed)
DOI: DOI:10.1161/01.HYP.0000196950.48596.21   (Journal Full-text)

Whereas angiotensin (Ang) II is the major effector peptide of the renin-angiotensin system, its metabolite, des-aspartyl1-Ang II (Ang III), may also have biologic activity. We investigated the effects of renal interstitial (RI) administration of candesartan (CAND), a specific Ang II type 1 receptor (AT1) blocker, with and without coinfusion of PD-123319 (PD), a specific Ang II type 2 receptor (AT2) blocker, on Na+ excretion (UNaV) in uninephrectomized rats. We also studied the effects of unilateral RI infusion of Ang II or Ang III on UNaV with and without systemic infusion of CAND with the noninfused kidney as control. In rats receiving normal Na+ intake, RI CAND increased UNaV from 0.07+/-0.08 to 0.82+/-0.17 micromol/min (P<0.01); this response was abolished by PD. During Na+ restriction, CAND increased UNaV from 0.06+/-0.02 to 0.1+/-0.02 micromol/min (P<0.05); this response also was blocked by PD. In rats with both kidneys intact, in the absence of CAND, unilateral RI infusion of Ang III did not significantly alter UNaV. However, with systemic CAND infusion, RI Ang III increased U(Na)V from 0.08+/-0.01 micromol/min to 0.18+/-0.04 micromol/min (P<0.01) at 3.5 nmol/kg per minute, and UNaV remained elevated throughout the infusion; this response was abolished by PD. However, RI infusion of Ang II did not significantly alter UNaV at any infusion rate (3.5 to 80 nmol/kg per minute) with or without systemic CAND infusion. These results suggest that intrarenal AT1 receptor blockade engenders natriuresis by activation of AT2 receptors. AT2 receptor activation via Ang III, but not via Ang II, mediates the natriuretic response in the presence of systemic AT1 receptor blockade.



Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
AgtRatintracellular sodium ion homeostasis  IMP  RGD 
Agtr2Ratintracellular sodium ion homeostasis  IMP  RGD 

Molecular Pathway Annotations    Click to see Annotation Detail View

RGD Manual Annotations


  
Objects Annotated

Genes (Rattus norvegicus)
Agt  (angiotensinogen)
Agtr2  (angiotensin II receptor, type 2)

Genes (Mus musculus)
Agt  (angiotensinogen)
Agtr2  (angiotensin II receptor, type 2)

Genes (Homo sapiens)
AGT  (angiotensinogen)
AGTR2  (angiotensin II receptor type 2)


Additional Information