Biomechanics and vasoreactivity of female intramural coronaries in angiotensin II induced hypertension.
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 approximately 200 microm) 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 A2 receptor agonist (U46619, 10(-6) M), bradykinin (BK, 10(-6) M), and finally at complete relaxation (in Ca2+-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 microm vs. 31.4+/-2.7 microm at 50 mmHg in Ca2+ -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 A2-induced tone.
Matrai
M
M
National Institute of Psychiatry & Neurology, Institute of Human Physiology and Clinical Experimental Research, Semmelweis University and Department of Geriatrics, Budapest, Hungary.
Szekacs
B
B
Mericli
M
M
Nadasy
G L
GL
Szekeres
M
M
Banhidy
F
F
Bekesi
G
G
Monos
E
E
Várbíró
Szabolcs
S
D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid / Q000494:pharmacology; D000804:Angiotensin II / Q000008:administration & dosage / Q000494:pharmacology; D000818:Animals; D001696:Biomechanical Phenomena / Q000187:drug effects / Q000502:physiology; D002200:Capillary Resistance / Q000187:drug effects; D003331:Coronary Vessels / Q000187:drug effects* / Q000473:pathology / Q000503:physiopathology; D005260:Female; D006973:Hypertension / Q000139:chemically induced* / Q000503:physiopathology; D008954:Models, Biological; D051381:Rats; D017207:Rats, Sprague-Dawley; D044244:Receptors, Thromboxane A2, Prostaglandin H2 / Q000819:agonists; D014661:Vasoconstriction / Q000187:drug effects* / Q000502:physiology; D014662:Vasoconstrictor Agents / Q000494:pharmacology
D044244:Receptors, Thromboxane A2, Prostaglandin H2; D014662:Vasoconstrictor Agents; D000804:Angiotensin II; D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid