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- W2057192607 abstract "We and others have demonstrated that impaired arterial baroreceptor reflex (ABR) function is one of the major causes of hypertension-associated end organ damage. The goal of this study was to clarify the potential neuro-humoral mechanisms responsible for impaired ABR-induced end organ damage. The sino-aortic denervated (SAD) rat was used as an animal model of ABR dysfunction. One-week SAD rats were characterized by hypertension, tachycardia, increased norepinephrine content, and decreased beta-endorphin and leu-enkephalin content in hypothalamus and medulla oblongata, and increased plasma levels of arginine-vasopressin. In 18-week SAD rats, the 24-hour average arterial pressure, heart rate, beta-endorphin, and leu-enkephalin content in hypothalamus and medulla oblongata and plasma levels of arginine-vasopressin and angiotensin II were not different from those measured in ABR-intact rats. However, blood pressure variability and angiotensin II content in kidney and left ventricle increased. When exposed to chronic stress, exaggerated changes in arterial pressure, blood pressure variability, the levels of central norepinephrine, beta-endorphin and leu-enkephalin, plasma arginine-vasopressin and angiotensin II, and tissue angiotensin II were found in 18-week SAD rats. These data indicate that a long-term impairment of ABR leads to chronic activation of central noradrenergic neurons and tissue renin-angiotensin system, and that stress induces exaggerated responses of neuro-humoral factors and hemodynamics in SAD rats. Thus, if the present results hold true for humans, one can expect abnormal neurotransmitter/neuromodulator responses to environmental insults in patients with impaired ABR function." @default.
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- W2057192607 date "2004-02-01" @default.
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- W2057192607 title "Changes of Central Norepinephrine, β-Endorphin, LEU-Enkephalin, Peripheral Arginine-Vasopressin, and Angiotensin II Levels in Acute and Chronic Phases of Sino-Aortic Denervation in Rats" @default.
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- W2057192607 doi "https://doi.org/10.1097/00005344-200402000-00011" @default.
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