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Glucose-dependent changes in alpha 2-noradrenergic receptors in hypothalamic nuclei
M Jhanwar-Uniyal1, M J Papamichael, S F Leibowitz
1Rockefeller University, New York, NY 10021.
Physiology & Behavior
|January 1, 1988
Summary
Blood glucose levels directly impact alpha 2-noradrenergic receptors in the paraventricular nucleus (PVN), influencing feeding behavior in rats. Lower glucose reduces receptor binding, while higher glucose maintains it.
Area of Science:
- Neuroscience
- Endocrinology
- Behavioral Science
Background:
- Hypothalamic norepinephrine (NE) and circulating glucose regulate feeding behavior in rats.
- Alpha 2-noradrenergic receptors are key mediators in this regulation.
Purpose of the Study:
- To investigate the relationship between blood glucose levels and the alpha 2-noradrenergic system.
- To determine if glucose affects alpha 2-noradrenergic receptor binding in specific hypothalamic areas.
Main Methods:
- Rats were subjected to food deprivation and refeeding protocols.
- Blood glucose levels were measured.
- [3H]p-aminoclonidine ([3H]PAC) binding to alpha 2-noradrenergic receptors was analyzed in hypothalamic areas, particularly the PVN.
Main Results:
- Food deprivation decreased serum glucose and alpha 2-receptor binding in the PVN.
- Refeeding or glucose administration prevented these declines.
- A positive correlation was observed between glucose levels and PVN alpha 2-receptor sites.
Conclusions:
- Blood glucose directly impacts alpha 2-noradrenergic receptor activity in the PVN.
- This neurochemical system is involved in glucose-mediated regulation of feeding behavior.