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Enhanced norepinephrine release in hypothalamus from locus coeruleus in SHR
S Kawasaki1, K Takeda, M Tanaka
1Second Department of Medicine, Kyoto Prefectural University of Medicine, Japan.
Japanese Heart Journal
|March 1, 1991
Summary
This study investigated the link between the locus coeruleus (LC) and hypertension. Findings suggest the LC
Area of Science:
- Neuroscience
- Cardiovascular Physiology
Background:
- Hypertension is a complex condition with multifactorial origins.
- The locus coeruleus (LC) and posterior hypothalamus are key brain regions involved in blood pressure regulation.
Purpose of the Study:
- To test the hypothesis that a functional projection from the LC to the posterior hypothalamus contributes to hypertension in Spontaneously Hypertensive Rats (SHR).
Main Methods:
- Injected L-glutamate (L-glu) into the LC of SHR and WKY rats.
- Measured norepinephrine (NE) in the posterior hypothalamus using brain dialysis.
- Administered 6-hydroxydopamine (6-OHDA) into the posterior hypothalamus of SHR.
Main Results:
- L-glu induced prolonged blood pressure elevation, significantly greater in SHR than WKY rats.
- LC stimulation increased extracellular NE in the posterior hypothalamus, with higher release in SHR.
- Posterior hypothalamic 6-OHDA administration reduced resting blood pressure and attenuated pressor responses to LC stimulation in SHR.
Conclusions:
- The LC functionally projects to the posterior hypothalamus.
- This LC-hypothalamic pathway plays a role in the development of hypertension in SHR.