PMID: 2994826Sep 16, 1985

Hypertensive response to saline microinjection in the area of the nucleus tractus solitarii of the rat

Brain Research
H GavrasI Gavras

Abstract

We investigated the blood pressure response elicited by microinjection of various hypertonic solutions into the area of the nucleus tractus solitarii (NTS) of the brainstem, an area rich in catecholaminergic neurons. Equiosmolar solutions of NaCl, dextrose, LiCl and KCl were employed. NaCl produced a prolonged blood pressure rise; LiCl and normal saline produced a similar rise of short duration; and KCl produced epileptic-type seizures with postictal hypertension. Dextrose had no effect and neither had NaCl microinjection in areas relatively distant from the NTS. The rise in blood pressure was not reversed by a vasopressin antagonist injected systemically, but was totally abolished by systemic alpha-adrenergic blockade with phentolamine. These findings suggest that sodium can cause hypertension by direct stimulation of the central sympathetic nervous system without participation of peripheral mechanisms such as fluid volume expansion or alteration of the vascular wall.

References

Jan 1, 1982·Journal of Cardiovascular Pharmacology·H GlossmannG Doell
Jun 1, 1984·Journal of Hypertension·P HatzinikolaouI Gavras
Aug 22, 1980·Science·P HatzinikolaouI Gavras

Citations

Jan 1, 1986·Hypertension·H Gavras
Mar 1, 1990·Journal of Speech and Hearing Research·S Friel-Patti, T Finitzo
Jul 1, 1992·American Journal of Audiology·Y S Sininger
Sep 18, 1999·Hypertension·K P MakaritsisH Gavras
Sep 1, 1991·Archives Internationales De Physiologie, De Biochimie Et De Biophysique·A Jean

Related Concepts

Metazoa
Diastolic Blood Pressure
Functional Cerebral Localization
Chloride Ion Level
Injections, Intraventricular
Lithium
Medulla Oblongata
Microinjections
Slow-K
August Rats

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