Amygdaloid central nucleus lesions and cholinergic blockade attenuate the response of the renal peripheral benzodiazepine receptor to stress.
Previous research has demonstrated that the density of peripheral benzodiazepine receptors (PBR) in rat kidney rapidly drops following exposure to 80 min of stress. The present experiments examined the contribution of the central and autonomic nervous systems in mediating this effect. Ibotenic acid lesions of the amygdaloid central nucleus (ACe), but not the lateral and basolateral amygdala, diminished the magnitude of the reduction in renal PBR binding caused by stress. Pretreating rats with methyl-scopolamine also inhibited the response of the PBR to stress. Adrenergic blockade with nadolol was ineffective. In order to test whether the PBR was under direct or indirect neural control during stress, unilateral renal denervation was performed. The stress-induced reduction in PBR binding persisted in denervated kidneys revealing that any neural control over the PBR that might exist must be indirect. Together the results suggest that the CNS may be involved in regulating the PBR during stress through the activation of intermediate, possibly hormonal, factors. The involvement of the central nervous system in the modulation of the PBR indicates the relevance of the PBR to physiological adaptations to stress.
Holmes
P V
PV
Schrier Research Laboratory, Department of Psychology, Brown University, Providence, RI 02912.
Drugan
R C
RC
D000109:Acetylcholine / Q000037:antagonists & inhibitors / Q000502:physiology*; D000679:Amygdala / Q000473:pathology / Q000502:physiology*; D000818:Animals; D003714:Denervation; D007051:Ibotenic Acid; D007668:Kidney / Q000294:innervation / Q000378:metabolism*; D008297:Male; D019832:N-Methylscopolamine; D009638:Norepinephrine / Q000502:physiology*; D010276:Parasympatholytics / Q000494:pharmacology; D010277:Parasympathomimetics / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D011963:Receptors, GABA-A / Q000378:metabolism*; D012602:Scopolamine Derivatives / Q000494:pharmacology; D013312:Stress, Physiological / Q000503:physiopathology*; D013566:Sympathomimetics / Q000494:pharmacology
D010276:Parasympatholytics; D010277:Parasympathomimetics; D011963:Receptors, GABA-A; D012602:Scopolamine Derivatives; D013566:Sympathomimetics; D007051:Ibotenic Acid; D000109:Acetylcholine; D019832:N-Methylscopolamine; D009638:Norepinephrine