We found that plasma nitrate, nitrite and RXNO levels were not significantly changed by low-dose Ang II or by an infusion of low-dose Ang II + PD123319 (Number 4E). and peroxisome proliferator-activated receptor- (PPAR-), respectively. Ang II infusion decreased blood pressure by 12 mmHg (P 0.001) in LCD/apoE(-/-) mice without altering cardiac output; a response clogged by PD123319. Although, AT2R activation neither triggered eNOS (p-Ser1177-eNOS) nor changed plasma NO metabolites, it caused an ~6-collapse increase in VSMC PPAR- levels (P 0.001) and the AT2R-mediated hypotension was abolished by GW-9662. AT2R-mediated hypotension was also inhibited by HCD, which selectively decreased VSMC AT2R manifestation by ~6-collapse (P 0.01). These findings suggest a novel pathway for the Ang II/AT2R-mediated hypotensive response that involves PPAR-, and is down controlled by a HCD. for 1 week. ApoE(-/-) mouse weights were 26.1 0.5 g (n = 11) and 25.7 0.54 g (n = 11) after 1 week of a LCD or a HCD, respectively. Vehicle, Ang II (12 g/kg/hr), Ang II + PD123319 (10 mg/kg/day time), GWS9662 (2 mg/kg/day time) or Ang II + GW-9662 were delivered via an osmotic minipump (Alzet, model 2002) placed in the peritoneal cavity for 7 days. These medicines were purchased from Sigma-Aldrich. Blood pressure measurements, echocardiography and cells collection After induction of anesthesia with isofluorane (~1-2%) a 1.0 F high fidelity pressure transducer (Millar Instruments, Houston, TX) was approved via the right carotid artery into the remaining ventricle (LV) of the heart. Electrodes were attached to allow ECG and heart rate recordings. LV pressure, ECG and heart rate were monitored until stable recordings were acquired. The pressure transducer was then slowly withdrawn into the aorta for measurement of central arterial pressure as explained . Echocardiography was performed to measure cardiac output using a Vevo 2100 ultrasound system (VisualSonics) under ~1-2% isoflurane as explained . Blood (0.5-1 ml) was collected by heart puncture, less than isoflurane anesthesia (3%), for lipid profiling. Subsequently, aortic arches were dissected and rinsed with ice-cold saline and then snap-frozen in OCT (OCT compound, Tissue-Tek). Blood pressure in conscious mice At 10 weeks of age a telemetry transmitter (PA-C10, Data Sciences International) was implanted into a carotid artery and 24-hr average MAP recorded. After baseline recordings, Ang II (12 g/kg/hr) was delivered via an osmotic minipump (Alzet, model 2002) placed subcutaneously and 24-hr average MAP recorded daily over the following 7 days. Immunohistochemistry Mouse ascending aorta cryosections (5 m) were utilized for quantitative immunohistochemistry using antibodies RHOB against CD31 [an endothelial cell (EC) marker (1:20, abdominal-958)], -clean muscle mass actin (SMA) [a VSMC marker (1:100, abdominal-8207)], CD68 [monocyte/macrophage cell marker, 1:100, Abcam), AT2R (1:100, abdominal-19134), phospho-Ser1177-endothelial nitric oxide synthase (eNOS) (p-Ser-1177eNOS; 1:100, sc-12972, Santa Cruz), and PPAR (1:50, ab-19481). Immunohistochemistry was performed as explained . NIS-Elements AR3.0 system Phenylpiracetam (Nikon) was utilized for quantitative fluorescence intensity (arbitrary devices) analysis. Immunoreactivity (ir) in each cells section was normalized relative to the total area measured for each section. Quantitative real-time PCR RNA extracted from snap freezing aortic tissue using a mirVana miRNA kit (Ambion) and real-time qRT-PCR performed as explained . The primer units for AT2R and GAPDH were as follows: AT2R (ahead: 5-TCCCTGGCAAGCATCTTATGTAG-3; opposite: 5-GCGGTTTCC-AACAAAACAAT-3); and GAPDH (ahead: 5-ATGGTGAAGGTCGGTGTG-3; opposite: 5-ACCAGTGGATGCAGGGAT-3). Western blotting Western blots were developed as explained previously [13,14]. The aortae were washed with 1XPBS and rapidly Phenylpiracetam snap freezing in liquid nitrogen. The tissues were homogenized on snow in ice-cold RIPA lysis buffer (Cell Signaling) supplemented with PMSF (Sigma) in addition to Total Mini protease inhibitors cocktail (Roche) and phosphatase inhibitors (Sigma). Lysates were centrifuged at 10,000 g for 30 min at 4C and the supernatants were collected. Protein concentrations were determined by a Bio-rads Bradford protein assay. Equivalent amounts of protein (12 g) were separated by SDS-PAGE and electroblotted onto PVDF membrane (Bio-rad). After pre-blocking with SuperBlock (Thermo-Pierce), membranes were incubated at 4C over night with polyclonal Phenylpiracetam rabbit anti-eNOS, -p-Ser1177-eNOS, or -GAPDH antibodies. The immunoblots were probed with horseradish peroxidase-conjugated secondary antibodies (Cell Signaling Technology) for 1 hour at space temperature and developed having a SuperSignal Western Dura Extended Duration chemiluminescence reagent kit (GE Healthcare) followed by.