P2.12 THE ROLE OF INSULIN ON FUNCTION OF RESISTANCE ARTERIES FROM OBESE YOUNG WOMEN AT RISK OF ‘DIABETES’ AND CONTROLS

DOI

10.1016/j.artres.2009.10.028How to use a DOI?

Abstract

Objectives: Vascular dysfunction is common in type 2 diabetes and obesity. The functional role of hyperinsulinaemia on human blood vessels in obese individuals remains unclear. We hypothesised that in young women, change in vessel function in a hyperinsulinaemic milieu would be influenced more by adiposity than plasma glucose.

Methods and Results: Women in a pregnancy cohort were stratified into upper & lower quartiles of fasting plasma glucose (FPG) when seen at follow-up 20 months after delivery. After subcutaneous biopsy, small arteries were tested ex-vivo by wire myography for vasoconstrictor [Noradrenaline (NA)] and vasodilator [carbachol and sodium nitroprusside (SNP)] responses before and after incubation with 100 mU/ml human insulin.

Results: Women with higher FPG had attenuated NA-contractile responses [0.8 (0.4–1.39) vs. 0.6 (−0.5 to 1.7) mN/mm, p=0.011), but differences in maximum response to carbachol (ΔEDD_max) before and after insulin incubation did not increase [26.8 (4.8–48.7) vs. 18.5 (−3.3 to 30.2) %, p=0.55) compared with those with lower FPG. Insulin reduced NA-induced contraction in those with higher [3.5 (2.4–4.6) vs. 2.4 (1.4–3.4) mN/mm: p=0.004] but not in those with lower BMI [4.1 (2.8–5.3) vs. 3.7 (2.5–5.0) mN/mm: p=0.33]. ΔEDD_max was greater in the high than low BMI group [37.7 (18.0 to 57.3) % vs.6.3 (−6.5 to 19.1) %, p=0.007].

Conclusions: Small arteries from women with greater adiposity and fasting glucose, exhibited reduced contraction with NA but only the former showed improved EDD, when tested in a hyperinsulinaemic milieu. Hyperinsulinaemia may be important in maintaining endothelial function in obesity.

Open Access

This is an open access article distributed under the CC BY-NC license.

TY  - JOUR
AU  - M. Banerjee
AU  - C. Austin
AU  - V. Charlton-Menys
AU  - W.F. Fraser
AU  - P. Pemberton
AU  - R.A. Malik
AU  - J.K. Cruickshank
PY  - 2009
DA  - 2009/12/03
TI  - P2.12 THE ROLE OF INSULIN ON FUNCTION OF RESISTANCE ARTERIES FROM OBESE YOUNG WOMEN AT RISK OF ‘DIABETES’ AND CONTROLS
JO  - Artery Research
SP  - 180
EP  - 180
VL  - 3
IS  - 4
SN  - 1876-4401
UR  - https://doi.org/10.1016/j.artres.2009.10.028
DO  - 10.1016/j.artres.2009.10.028
ID  - Banerjee2009
ER  -