Evidence for functional expression of vascular angiotensin II type 2 receptors in patients with insulin resistance

Diabetes, Obesity & Metabolism
Divina Gracilla BrillanteLaurence Guy Howes

Abstract

Angiotensin II type 2 (AT2) receptors are believed to become over-expressed in response to cardiovascular damage and to mediate beneficial effects (e.g. vasodilation). It is unknown whether AT2 receptors are functionally expressed in patients with insulin resistance (INSR). In this study, we investigated the role of the highly selective AT2 receptor antagonist, PD123319, on arterial stiffness and haemodynamic parameters in patients with INSR, compared with an age- and gender-matched control (N) group to determine whether there is functional expression of vascular AT2 receptors in patients with INSR. We studied 10 subjects with INSR [mean age 28 +/- 5 years, body mass index (BMI) 30.4 +/- 5.4 kg/m(2), mean cholesterol level 4.7 +/- 0.7 mmol/l, mean homeostasis model assessment 2.78 +/- 0.84] and 10 age- and gender-matched normal subjects (mean age 27 +/- 7 years, BMI 23.6 +/- 2.5 kg/m(2), mean cholesterol level 3.9 +/- 0.6 mmol/l). All were normotensive, non-smokers and on no medications. Subjects received a 3-min infusion of PD123319 (10 microg/min). At the end of the infusion, arterial stiffness indices [stiffness index (SI) and reflective index (RI)] and haemodynamic parameters [cardiac index, systemic vascular resistance ind...Continue Reading

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