Immediate and Long-Term Effects of Neonatal MK-801 Treatment on Nonspatial Learning
These experiments observed the immediate and long-term effects of neonatal treatment with MK-801 on patterned single alternation (PSA), a form of nonspatial, memory-based learning. Rat pups were injected daily on postnatal days (PND) 7-19, with MK-801 (MK+) or the less active isomer of MK-801 (MK-)...
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Published in | Proceedings of the National Academy of Sciences - PNAS Vol. 95; no. 19; pp. 11435 - 11439 |
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Main Authors | , |
Format | Journal Article |
Language | English |
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United States
National Academy of Sciences of the United States of America
15.09.1998
National Acad Sciences National Academy of Sciences The National Academy of Sciences |
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Abstract | These experiments observed the immediate and long-term effects of neonatal treatment with MK-801 on patterned single alternation (PSA), a form of nonspatial, memory-based learning. Rat pups were injected daily on postnatal days (PND) 7-19, with MK-801 (MK+) or the less active isomer of MK-801 (MK-) (0.25 mg/kg), and trained at either PND 22 or 60. Rats treated with MK+or MK-and trained on PND 22 were significantly impaired in PSA when compared with the saline control. Beyond the learning impairment, MK+rats showed an overall decreased running speed during training. They also presented an array of abnormal behaviors and significant weight loss. These nonassociative variables were determined for several doses (0.025m 0.05, 0.1, 0.15, and 0.20 mg/kg) through PND days 22-25. Rats that received the threshold dose for secondary effects (0.025 mg/kg) also showed an overall decrease in running speed, but failed to show a significant nonspatial learning impairment on PSA. The PSA learning impairment was found to be not long lasting; rats trained at PND 60, after neonatally receiving the original high dose of MK-801, did not differ from controls. |
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AbstractList | These experiments observed the immediate and long-term effects of neonatal treatment with MK-801 on patterned single alternation (PSA), a form of nonspatial, memory-based learning. Rat pups were injected daily on postnatal days (PND) 7-19, with MK-801 (MK+) or the less active isomer of MK-801 (MK-) (0.25 mg/kg), and trained at either PND 22 or 60. These experiments observed the immediate and long-term effects of neonatal treatment with MK-801 on patterned single alternation (PSA), a form of nonspatial, memory-based learning. Rat pups were injected daily on postnatal days (PND) 7-19, with MK-801 (MK+) or the less active isomer of MK-801 (MK-) (0.25 mg/kg), and trained at either PND 22 or 60. Rats treated with MK+ or MK- and trained on PND 22 were significantly impaired in PSA when compared with the saline control. Beyond the learning impairment, MK+ rats showed an overall decreased running speed during training. They also presented an array of abnormal behaviors and significant weight loss. These nonassociative variables were determined for several doses (0.025, 0. 05, 0.1, 0.15, and 0.20 mg/kg) through PND days 22-25. Rats that received the threshold dose for secondary effects (0.025 mg/kg) also showed an overall decrease in running speed, but failed to show a significant nonspatial learning impairment on PSA. The PSA learning impairment was found to be not long lasting; rats trained at PND 60, after neonatally receiving the original high dose of MK-801, did not differ from controls. These experiments observed the immediate and long-term effects of neonatal treatment with MK-801 on patterned single alternation (PSA), a form of nonspatial, memory-based learning. Rat pups were injected daily on postnatal days (PND) 7–19, with MK-801 (MK + ) or the less active isomer of MK-801 (MK − ) (0.25 mg/kg), and trained at either PND 22 or 60. Rats treated with MK + or MK − and trained on PND 22 were significantly impaired in PSA when compared with the saline control. Beyond the learning impairment, MK + rats showed an overall decreased running speed during training. They also presented an array of abnormal behaviors and significant weight loss. These nonassociative variables were determined for several doses (0.025, 0.05, 0.1, 0.15, and 0.20 mg/kg) through PND days 22–25. Rats that received the threshold dose for secondary effects (0.025 mg/kg) also showed an overall decrease in running speed, but failed to show a significant nonspatial learning impairment on PSA. The PSA learning impairment was found to be not long lasting; rats trained at PND 60, after neonatally receiving the original high dose of MK-801, did not differ from controls. These experiments observed the immediate and long-term effects of neonatal treatment with MK-801 on patterned single alternation (PSA), a form of nonspatial, memory-based learning. Rat pups were injected daily on postnatal days (PND) 7–19, with MK-801 (MK + ) or the less active isomer of MK-801 (MK − ) (0.25 mg/kg), and trained at either PND 22 or 60. Rats treated with MK + or MK − and trained on PND 22 were significantly impaired in PSA when compared with the saline control. Beyond the learning impairment, MK + rats showed an overall decreased running speed during training. They also presented an array of abnormal behaviors and significant weight loss. These nonassociative variables were determined for several doses (0.025, 0.05, 0.1, 0.15, and 0.20 mg/kg) through PND days 22–25. Rats that received the threshold dose for secondary effects (0.025 mg/kg) also showed an overall decrease in running speed, but failed to show a significant nonspatial learning impairment on PSA. The PSA learning impairment was found to be not long lasting; rats trained at PND 60, after neonatally receiving the original high dose of MK-801, did not differ from controls. These experiments observed the immediate and long-term effects of neonatal treatment with MK-801 on patterned single alternation (PSA), a form of nonspatial, memory-based learning. Rat pups were injected daily on postnatal days (PND) 7-19, with MK-801 (MK+) or the less active isomer of MK-801 (MK-) (0.25 mg/kg), and trained at either PND 22 or 60. Rats treated with MK+or MK-and trained on PND 22 were significantly impaired in PSA when compared with the saline control. Beyond the learning impairment, MK+rats showed an overall decreased running speed during training. They also presented an array of abnormal behaviors and significant weight loss. These nonassociative variables were determined for several doses (0.025m 0.05, 0.1, 0.15, and 0.20 mg/kg) through PND days 22-25. Rats that received the threshold dose for secondary effects (0.025 mg/kg) also showed an overall decrease in running speed, but failed to show a significant nonspatial learning impairment on PSA. The PSA learning impairment was found to be not long lasting; rats trained at PND 60, after neonatally receiving the original high dose of MK-801, did not differ from controls. These experiments observed the immediate and long-term effects of neonatal treatment with MK-801 on patterned single alternation (PSA), a form of nonspatial, memory-based learning. Rat pups were injected daily on postnatal days (PND) 7-19, with MK-801 (MK super(+)) or the less active isomer of MK-801 (MK super(-)) (0.25 mg/kg), and trained at either PND 22 or 60. Rats treated with MK super(+) or MK super(-) and trained on PND 22 were significantly impaired in PSA when compared with the saline control. Beyond the learning impairment, MK super(+) rats showed an overall decreased running speed during training. They also presented an array of abnormal behaviors and significant weight loss. These nonassociative variables were determined for several doses (0.025, 0.05, 0.1, 0.15, and 0.20 mg/kg) through PND days 22-25. Rats that received the threshold dose for secondary effects (0.025 mg/kg) also showed an overall decrease in running speed, but failed to show a significant nonspatial learning impairment on PSA. The PSA learning impairment was found to be not long lasting; rats trained at PND 60, after neonatally receiving the original high dose of MK-801, did not differ from controls. |
Author | Amsel, Abram Griesbach, Grace S. |
AuthorAffiliation | Department of Psychology and Institute for Neuroscience, University of Texas, Austin, TX 78712 |
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BackLink | https://www.ncbi.nlm.nih.gov/pubmed/9736754$$D View this record in MEDLINE/PubMed |
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Snippet | These experiments observed the immediate and long-term effects of neonatal treatment with MK-801 on patterned single alternation (PSA), a form of nonspatial,... |
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SubjectTerms | Animal behavior Animals Animals, Newborn - physiology Behavior, Animal - drug effects Behavioral neuroscience Biochemistry Biological Sciences Body Weight - drug effects Discrimination learning Dizocilpine Maleate - pharmacology Dosage Drug therapy Excitatory Amino Acid Antagonists - pharmacology Isomers Learning Learning - drug effects Learning rate Male Memory - drug effects N methyl D aspartate receptors Neurology Observational learning Rats Rats, Sprague-Dawley Rodents Running Running speed Stereoisomerism Vocalization, Animal - drug effects |
Title | Immediate and Long-Term Effects of Neonatal MK-801 Treatment on Nonspatial Learning |
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