Effects ofL-?-N-methylamino-L-alanine (L-BMAA) on the cortical cholinergic and glutamatergic systems of the rat
| Autor: | Z. Rakonczay, Y. Matsuoka, Ezio Giacobini |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Male
medicine.medical_specialty AMPA receptor Biology Choline O-Acetyltransferase Cellular and Molecular Neuroscience chemistry.chemical_compound Parasympathetic Nervous System Internal medicine medicine Animals Neurotoxin Ibotenic Acid alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid Injections Intraventricular Brain Chemistry Cerebral Cortex Behavior Animal Cyanobacteria Toxins Amino Acids Diamino Quisqualic Acid Rats Inbred Strains Acetylcholinesterase Choline acetyltransferase Rats Receptors Neurotransmitter Quinuclidinyl Benzilate medicine.anatomical_structure Endocrinology Receptors Glutamate chemistry Cerebral cortex NMDA receptor Cholinergic Neuroscience Acetylcholine medicine.drug |
| Zdroj: | Journal of Neuroscience Research. 29:121-126 |
| ISSN: | 1097-4547 0360-4012 |
| DOI: | 10.1002/jnr.490290114 |
| Popis: | Neurotoxic properties of L-beta-methylamino-alanine (L-BMAA) after chronic intracerebroventricular (i.c.v.) (500 micrograms/day) administration up to 60 days were investigated in the cerebral cortex of the rat. At day 16, there was a significant decrease in acetylcholinesterase (AChE) activity, 3H-QNB binding, 3H-glutamate (GLU) binding, and 3H-glutamate binding in the presence of quisqualate (QA). Choline acetyltransferase (ChAT) activity and 3H-nicotine binding were increased at day 16; however, ChAT activity decreased below control levels at days 40 and 60. 3H-Nicotine and 3H-AMPA binding were significantly lower than controls at both days 40 and 60. These significant neurochemical differences from unoperated controls were seen in both drug-injected and non-injected sides of the cortex suggesting a generalized cortical damage to glutamatergic and cholinergic systems. In the presence of bicarbonate, L-BMAA inhibited in vitro both glutamate and AMPA binding sites. L-BMAA treatment elicited behavioral changes such as splay, jerking movements, and rigidity. These symptoms were present for a period of at least 6 days after daily administration. After this period, symptoms were gradually attenuated and at day 10 the behavior of the L-BMAA-treated animals was not different from that of Na-bicarbonate injected controls. Our results are interpreted as an activation of quisqualate (AMPA) receptors by L-BMAA involving NMDA as well as non-NMDA receptors. |
| Databáze: | OpenAIRE |
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