Biomechanics and vasoreactivity of female intramural coronaries in angiotensin II induced hypertension

M. Matrai, B. Szekacs, M. Mericli, G. L. Nadasy, M. Szekeres, F. Banhidy, G. Bekesi, E. Monos, Szabolcs Várbíró

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Hypertension causes small vessel remodeling, vasomotor alterations. We investigated diameter, tone and mechanics of intramural small coronaries of female rats that received chronic angiotensin treatment to induce hypertension.Angiotensin II infusion (AII, 100 ng/bwkg/min, sc.) was used to establish hypertension in 10 female rats. Other 10 rats served as controls. Following 4 weeks of treatment, side branches of the left anterior descendant coronary (diameter∼200 μm) were isolated, cannulated and pressure-diameter curves were registered between 2-90 mmHg. Changes in vessel diameter were measured in Krebs solution, in the presence of thromboxane A 2receptor agonist (U46619, 10 -6 M), bradykinin (BK, 10 -6 M), and finally at complete relaxation (in Ca 2+ -free solution).Chronic AII treatment raised the mean arterial pressure (130±5 mmHg vs. 96±2 mmHg, average ±SEM) significantly. Wall thickness of the AII group was significantly greater (40.2±4.2 μm vs. 31.4±2.7 μm at 50 mmHg in Ca 2+ -free solution), but cross-section of the vessel wall did not differ. Tangentional wall stress and elastic modulus decreased significantly in hypertensive animals. Constrictions in the presence of U46619 were greater in the AII group (24.4± 5.6% vs. 14.5±3.3% at 50 mmHg).In hypertension, intramural small coronaries showed inward eutrophic remodeling, as a morphological adaptation following AII treatment enhanced thromboxane A 2 - induced tone.

Original languageEnglish
Pages (from-to)31-40
Number of pages10
JournalActa physiologica Hungarica
Volume97
Issue number1
DOIs
Publication statusPublished - Mar 1 2010

Keywords

  • Angiotensin II
  • Contractility
  • Female
  • Heart
  • Intramural coronary

ASJC Scopus subject areas

  • Physiology (medical)

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