Biomaterial Database

Dual modulation of dopamine release from anterior nucleus accumbens through cholecystokinin-B receptor subsites. 1997

I Léna, and B P Roques, and C Durieux

Département de Pharmacochimie Moléculaire et Structurale, U. 266 INSERM-URA D1500 CNRS, Université René Descartes, UFR des Sciences Pharmaceutiques et Biologiques, Paris, France.

Previous binding studies have suggested the existence of two affinity states for cholecystokinin-B (CCK-B) receptor. One study, using BC 197 and BC 264, two highly selective CCK-B agonists, has shown that BC 197 is selective for one subsite, B1, and that BC 264 has the same affinity for the two subsites, B1 and B2. Therefore, the possible involvement of CCK-B subsites in the modulation of endogenous dopamine (DA) release from slices of the anterior part of the nucleus accumbens was investigated with these two agonists in order to associate a functional response with activation of each subsite. The selective B1 agonist BC 197 produced a dose-dependent increase of 35 mM K(+)-stimulated DA release. In contrast, at a low concentration (20 nM), BC 264 inhibited the K(+)-evoked DA release, whereas at a higher concentration (1 microM), it stimulated the DA release. These two opposing effects were suppressed by the CCK-B antagonist PD-134,308, but not by the CCK-A antagonist L-364,718 and were not prevented by tetrodotoxin, a Na(+)-channel blocker. Moreover, BC 264 at 20 nM, in the presence of PD-134,308 at a concentration that would block the B2 subsites (0.1 nM), increased the evoked DA release. All together, these results support further the existence of distinct CCK-B subsites and suggest that, in the anterior nucleus accumbens, their stimulation mediates opposite effects on K(+)-stimulated DA release via a presynaptic mechanism.

UI	MeSH Term	Description	Entries
D007211	Indoles	Benzopyrroles with the nitrogen at the number one carbon adjacent to the benzyl portion, in contrast to ISOINDOLES which have the nitrogen away from the six-membered ring.
D008297	Male		Males
D008536	Meglumine	1-Deoxy-1-(methylamino)-D-glucitol. A derivative of sorbitol in which the hydroxyl group in position 1 is replaced by a methylamino group. Often used in conjunction with iodinated organic compounds as contrast medium.	Methylglucamine
D009714	Nucleus Accumbens	Collection of pleomorphic cells in the caudal part of the anterior horn of the LATERAL VENTRICLE, in the region of the OLFACTORY TUBERCLE, lying between the head of the CAUDATE NUCLEUS and the ANTERIOR PERFORATED SUBSTANCE. It is part of the so-called VENTRAL STRIATUM, a composite structure considered part of the BASAL GANGLIA.	Accumbens Nucleus,Nucleus Accumbens Septi,Accumbens Septi, Nucleus,Accumbens Septus, Nucleus,Accumbens, Nucleus,Nucleus Accumbens Septus,Nucleus, Accumbens,Septi, Nucleus Accumbens,Septus, Nucleus Accumbens
D010446	Peptide Fragments	Partial proteins formed by partial hydrolysis of complete proteins or generated through PROTEIN ENGINEERING techniques.	Peptide Fragment,Fragment, Peptide,Fragments, Peptide
D011188	Potassium	An element in the alkali group of metals with an atomic symbol K, atomic number 19, and atomic weight 39.10. It is the chief cation in the intracellular fluid of muscle and other cells. Potassium ion is a strong electrolyte that plays a significant role in the regulation of fluid volume and maintenance of the WATER-ELECTROLYTE BALANCE.
D011949	Receptors, Cholecystokinin	Cell surface proteins that bind cholecystokinin (CCK) with high affinity and trigger intracellular changes influencing the behavior of cells. Cholecystokinin receptors are activated by GASTRIN as well as by CCK-4; CCK-8; and CCK-33. Activation of these receptors evokes secretion of AMYLASE by pancreatic acinar cells, acid and PEPSIN by stomach mucosal cells, and contraction of the PYLORUS and GALLBLADDER. The role of the widespread CCK receptors in the central nervous system is not well understood.	CCK Receptors,Caerulein Receptors,Cholecystokinin Octapeptide Receptors,Cholecystokinin Receptors,Pancreozymin Receptors,Receptors, CCK,Receptors, Caerulein,Receptors, Pancreozymin,Receptors, Sincalide,Sincalide Receptors,CCK Receptor,CCK-4 Receptors,CCK-8 Receptors,Cholecystokinin Receptor,Receptors, CCK-4,Receptors, CCK-8,Receptors, Cholecystokinin Octapeptide,CCK 4 Receptors,CCK 8 Receptors,Octapeptide Receptors, Cholecystokinin,Receptor, CCK,Receptor, Cholecystokinin,Receptors, CCK 4,Receptors, CCK 8
D002118	Calcium	A basic element found in nearly all tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes.	Coagulation Factor IV,Factor IV,Blood Coagulation Factor IV,Calcium-40,Calcium 40,Factor IV, Coagulation
D002766	Cholecystokinin	A peptide, of about 33 amino acids, secreted by the upper INTESTINAL MUCOSA and also found in the central nervous system. It causes gallbladder contraction, release of pancreatic exocrine (or digestive) enzymes, and affects other gastrointestinal functions. Cholecystokinin may be the mediator of satiety.	Pancreozymin,CCK-33,Cholecystokinin 33,Uropancreozymin
D003470	Culture Media	Any liquid or solid preparation made specifically for the growth, storage, or transport of microorganisms or other types of cells. The variety of media that exist allow for the culturing of specific microorganisms and cell types, such as differential media, selective media, test media, and defined media. Solid media consist of liquid media that have been solidified with an agent such as AGAR or GELATIN.	Media, Culture