کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2014260 | 1067150 | 2007 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
d-Cycloserine enhances conditioned taste aversion learning in rats
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
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چکیده انگلیسی
Conditioned taste aversion (CTA) is a form of associative learning in which the pairing of a taste with a toxin causes an animal to avoid the taste. NMDA receptor mediated neurotransmission has been implicated in CTA, but the role of the NMDA receptor glycine-binding site has not been examined. To examine the effects on CTA of the glycinergic NMDA receptor agonist d-cycloserine, rats received d-cycloserine (15Â mg/kg, i.p.) or vehicle 15Â min before 10-min access to 0.125% saccharin, followed by a low dose of LiCl (19Â mg/kg, i.p.). CTA was measured with 24-h, 2-bottle preference tests between water and saccharin. Vehicle-treated rats formed a mild CTA that rapidly extinguished, while d-cycloserine-treated rats formed a stronger CTA that extinguished slowly. The effect of d-cycloserine was specific to the NMDA receptor glycine-binding site, because pretreatment with HA-966 (6Â mg/kg), a partial glycinergic agonist, blocked enhancement by d-cycloserine. Three follow-up experiments suggest that the enhancement of CTA was not due to an aversive effect of d-cycloserine. First, saccharin paired with d-cycloserine (15Â mg/kg) alone did not induce a CTA, although a higher dose (30Â mg/kg) did significantly lower saccharin preference. Second, pretreatment with d-cycloserine did not increase the duration of “lying-on-belly” behavior induced by LiCl. Third, pretreatment with d-cycloserine did not increase c-Fos induction by either LiCl or vehicle injection in central visceral relays (the nucleus of the solitary tract, the parabrachial nucleus, the central nucleus of the amygdala, the supraoptic nucleus, and the paraventricular nucleus). These results confirm the participation of NMDA receptor, and specifically the glycine-binding site of NMDA receptor, in CTA learning.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Pharmacology Biochemistry and Behavior - Volume 87, Issue 3, AugustâSeptember 2007, Pages 321-330
Journal: Pharmacology Biochemistry and Behavior - Volume 87, Issue 3, AugustâSeptember 2007, Pages 321-330
نویسندگان
Melissa Nunnink, Rachel A. Davenport, Breyda Ortega, Thomas A. Houpt,