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(Hypertension. 1995;25:194-200.)
© 1995 American Heart Association, Inc.
Articles |
Different Mechanisms of Endothelial Dysfunction With Aging and Hypertension in Rat Aorta
Presented at the Council for High Blood Pressure Research 48th Annual Fall Conference and Scientific Sessions, Chicago, Ill, September 27-30, 1994.
From the Department of Research, Laboratory of Vascular Research, University Hospital, Basel (C.F.K.), and the Department of Cardiology, Laboratory of Cardiovascular Research, Inselspital, Bern (C.F.K., T.F.L.), Switzerland.
Correspondence to Thomas F. Lüscher, MD, Cardiology, University Hospital, Inselspital, CH-3010 Bern, Switzerland.
Abstract We analyzed the effects and mechanisms of aging in aortic endothelium and vascular smooth muscle of 12-week-old (adult) and 72-week-old (senescent) normotensive Wistar-Kyoto rats (WKY) and spontaneously hypertensive rats (SHR). Aortas were suspended in organ chambers filled with physiological salt solution (95% O2/5% CO2; 37°C), and isometric tension was measured. In WKY, endothelium-dependent relaxations to acetylcholine were diminished with aging (P<.05); in SHR, they were reduced compared with WKY (P<.05) but unchanged with aging. The thromboxane/endoperoxide receptor antagonist SQ 30741 increased relaxations only in adult SHR. Relaxations to sodium nitroprusside were slightly enhanced with age in WKY and SHR (P<.05). Endothelium-dependent contractions to acetylcholine were unmasked by NG-nitro-L-arginine methyl ester (P<.05) and prevented by SQ 30741 or endothelium removal. In WKY, contractions increased with age. In adult SHR, marked endothelium-dependent contractions occurred (P<.05 versus WKY), which diminished with age (P=NS versus senescent WKY). The thromboxane analogue U46619 elicited similar contractions in adult and senescent WKY and adult SHR, whereas responses in senescent SHR were weaker (P<.05). In WKY and SHR, contractions to norepinephrine were similar and unaltered by aging. In WKY, contractions to endothelin-1 remained unaffected by aging. Adult SHR exhibited contractions to endothelin-1 comparable to those in WKY, whereas senescent SHR contracted less (P<.05). Bosentan, a combined endothelin-A/endothelin-B receptor antagonist, inhibited endothelin-1 markedly, especially in SHR (P<.05). Thus, aging causes different alterations in endothelium and smooth muscle in WKY and SHR aorta. In adult SHR, endothelium-dependent relaxations are reduced because of formation of prostaglandin H2, whereas in senescent SHR and senescent WKY, impaired formation or increased inactivation of nitric oxide must be involved. Contractions to endothelin but not to norepinephrine are reduced with aging only in SHR.
Key Words: endothelin • endothelium-derived contracting factor • nitric oxide • aging • endothelium
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