Alterations of muscarinic receptor subtypes in pathways relating to memory: Effects of lesions and transplants
Muscarinic cholinergic receptors have been classified pharmacologically into two distinct populations designated muscarinic type-one (M-1) and mscarinic type-two (M-2). The semiquantitative technique of receptor autoradiography was used to examine the anatomical and cellular distribution, and densities of M-1 and M-2 receptors in the rate brain. Muscarinic receptors were labeled with the classical antagonist ({sup 3}H)quinuclidinyl benzilate (QNB). Differentiation of the muscarinic subtypes was accomplished by competition studies of ({sup 3}H)QNB against the relatively selective M-1 antagonist pirenzepine (PZ), and the relatively selective M-2 antagonist, AFDX-116. In addition, M-1 and M-2 receptors were directly labeled with ({sup 3}H)PZ and ({sup 3}H)AFDX-116, respectively. Cholinergic pathways from the large cholinergic neurons in the nucleus basalis magnocellularis (NBM) to the cortex and from the medial septum (MS) to the hippocampus were examined by lesioning with the selective cholinergic neurotoxin, AF64A. Bilateral cerebral cortical infarction was performed in order to analyze potential changes in muscarinic receptor populations in subcortical structures that are sensitive to cortical infarction. Finally, the response of muscarinic receptors to fetal septodiagonal band transplants in the deafferentated hippocampus was examined.
- Research Organization:
- Utah Univ., Salt Lake City, UT (USA)
- OSTI ID:
- 6415080
- Country of Publication:
- United States
- Language:
- English
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59 BASIC BIOLOGICAL SCIENCES
ANIMAL CELLS
ANIMALS
AUTONOMIC NERVOUS SYSTEM AGENTS
AUTORADIOGRAPHY
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL PATHWAYS
BODY
BRAIN
CENTRAL NERVOUS SYSTEM
DISTRIBUTION
DRUGS
HYDROGEN COMPOUNDS
KINETICS
LABELLING
MAMMALS
MEMBRANE PROTEINS
NERVE CELLS
NERVOUS SYSTEM
ORGANIC COMPOUNDS
ORGANS
PARASYMPATHOMIMETICS
PROTEINS
RATS
REACTION KINETICS
RECEPTORS
RODENTS
SOMATIC CELLS
SUBCELLULAR DISTRIBUTION
TRANSPLANTS
TRITIUM COMPOUNDS
VERTEBRATES