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Metabolic characteristics of aorta from spontaneously hypertensive and renal and deoxycorticosterone acetate-salt hypertensive rats.
- Source :
-
Hypertension (Dallas, Tex. : 1979) [Hypertension] 1986 Feb; Vol. 8 (2), pp. 103-8. - Publication Year :
- 1986
-
Abstract
- The purpose of this study was to determine if any changes occurred in the basal and stimulated rates of oxygen consumption and lactate production of thoracic aortas from spontaneously hypertensive rats (SHR) and renal and deoxycorticosterone acetate (DOCA)-salt hypertensive rats, and, if so, whether these changes were similar in these three models of hypertension. Rings of thoracic aorta were placed in an isothermic (37 degrees C) muscle bath, and isometric tension development, oxygen consumption, and lactate production were measured. The results indicated that under basal conditions oxygen consumption, but not lactate production, was higher in aortas from all three hypertensive models; the elevation above control was greatest in the renal model (95%) and smallest in SHR (34%). On stimulation with 60 mM KCl, a significant increase in oxygen consumption above basal value occurred in all aorta samples (p less than 0.05); however, lactate production was increased above basal only in aortas from hypertensive animals. Only in aortas from renal and DOCA-salt models was the rate of oxygen consumption during stimulation significantly greater than that of their normotensive controls (p less than 0.05). Developed active stress in response to KCl was the same in all groups, and when the change in lactate production or oxygen consumption was expressed relative to the amount of active stress developed, no differences were observed. These results suggest that, 1) compared to values in aortas from normotensive animals, only the basal rate of oxygen consumption is higher; 2) this higher level of basal metabolic activity is not associated with an alteration in the metabolic cost of force development.(ABSTRACT TRUNCATED AT 250 WORDS)
- Subjects :
- Animals
Blood Pressure
Desoxycorticosterone pharmacology
Hypertension chemically induced
Hypertension, Renal metabolism
Ion Channels
Lactates biosynthesis
Lactic Acid
Male
Muscle Contraction
Muscle, Smooth, Vascular metabolism
Oxygen Consumption
Potassium metabolism
Rats
Rats, Inbred SHR
Rats, Inbred Strains
Sodium metabolism
Aorta, Thoracic metabolism
Hypertension metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 0194-911X
- Volume :
- 8
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Hypertension (Dallas, Tex. : 1979)
- Publication Type :
- Academic Journal
- Accession number :
- 2417951
- Full Text :
- https://doi.org/10.1161/01.hyp.8.2.103