Modulation of Vasomotor Function by Perivascular Adipose Tissue of Renal Artery Depends on Severity of Arterial Dysfunction to Nitric Oxide and Severity of Metabolic Parameters

• Published in: Biomolecules (Basel, Switzerland) Switzerland), 2022-06, Vol.12 (7), p.870
• Main Authors: Kagota, Satomi, Futokoro, Risa, McGuire, John J., Maruyama-Fumoto, Kana, Shinozuka, Kazumasa
• Format: Article
• Language: English
• Subjects: Abdomen; Acetylcholine; Adipocytes; Adipose tissue; Age; Angiotensin AT1 receptors; Angiotensin II; Blood pressure; Body fat; Coronary vessels; Endothelium; Females; Gender differences; Gene expression; Glucose; Hypertension; Inflammation; Kidney diseases; Laboratory animals; Males; Metabolic disorders; Metabolic syndrome; mRNA; Nitric oxide; Obesity; Phenylephrine; Renal artery; Sex differences; Smooth muscle; Veins & arteries; Womens health
• ISSN: 2218-273X; 2218-273X
• DOI: 10.3390/biom12070870

Perivascular adipose tissue (PVAT) enhances vascular relaxation of mesenteric arteries in SHRSP.Z-Leprfa/IzmDmcr rats (SPZF), a metabolic syndrome model. We investigated and compared the effects of PVAT on the renal artery in SPZF with those on SHR/NDmcr-cp rats (CP). Renal arteries with and without PVAT were isolated from 23-week-old SPZF and CP. The effects of PVAT on acetylcholine- and nitroprusside-induced relaxation were examined using bioassays with phenylephrine-contracted arterial rings. Acetylcholine-induced relaxations without PVAT in SPZF and CP were 0.7- and 0.5-times lower in females than in males, respectively. In the presence of PVAT, acetylcholine-induced relaxations increased 1.4- and 2-times in male and female CP, respectively, but did not differ in SPZF. Nitroprusside-induced relaxation with and without PVAT was 0.7-times lower in female than in male SPZF but did not differ in CP. Angiotensin-II type-1 receptor (AT1R)/AT1R-associated protein mRNA ratios were lower in CP than in the SPZF and negatively correlated with the difference in arterial relaxation with and without PVAT. The effects of renal artery PVAT differed between the SPZF and CP groups. Higher levels of enhanced AT1R activity in SPZF PVAT may drive these differences by impairing the vascular smooth muscle responses to nitric oxide.