Specific [3H]glutamate binding to synaptic membranes from the cerebral cortex and hippocampus of 7-, 12- and 18-day-old rats was examined, both in control animals and during seizures induced by homocysteine. In the cerebral cortex a transient peak of glutamate binding was observed in 7-day-old group, whereas in the hippocampus it occurred in 12-day-old animals. Total specific [3H]glutamate binding was not influenced by preceding seizure activity in either of the age groups and both the studied regions. NMDA- and QA-sensitive glutamate bindings represent the highest portion of the total binding. Moreover, NMDA-sensitive binding in the cerebral cortex of 7-day-old rats is significantly higher as compared to the two more mature groups. The proportion of individual receptor subtypes on total binding in each age group was not influenced by preceding seizure activity. However, NMDA-sensitive binding in the hippocampus of 12-day-old rats, sacrificed during homocysteine-induced seizures, was significantly increased as compared to corresponding controls. In contrast to the effect of NMDA, AMPA, kainate and quisqualate which displaced to a different extent [3H]glutamate binding, homocysteine had no effect when added to membrane preparations. Similarly, [3H]CPP and [3H]AMPA bindings were not affected in the presence of homocysteine. It thus seems unlikely that homocysteine is an effective agonist for conventional ionotropic glutamate receptors. Its potential activity at some of the modulatory sites at the NMDA receptor channel complex or at metabotropic receptors has to be clarified in further experiments.

• MeSH
• analýza rozptylu MeSH
• hipokampus růst a vývoj   metabolismus   MeSH
• homocystein MeSH
• krysa rodu Rattus MeSH
• kyselina alfa-amino-3-hydroxy-5-methyl-4-isoxazolpropionová metabolismus   MeSH
• kyselina chischalová metabolismus   MeSH
• kyselina glutamová metabolismus   MeSH
• kyselina kainová metabolismus   MeSH
• mozková kůra růst a vývoj   metabolismus   MeSH
• N-methylaspartát metabolismus   MeSH
• potkani Wistar MeSH
• referenční hodnoty MeSH
• stárnutí metabolismus   MeSH
• synaptické membrány metabolismus   MeSH
• tritium MeSH
• vazebná místa MeSH
• záchvaty chemicky indukované   metabolismus   MeSH
• zvířata MeSH
• Check Tag
• krysa rodu Rattus MeSH
• mužské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• homocystein MeSH
• kyselina alfa-amino-3-hydroxy-5-methyl-4-isoxazolpropionová MeSH
• kyselina chischalová MeSH
• kyselina glutamová MeSH
• kyselina kainová MeSH
• N-methylaspartát MeSH
• tritium MeSH