Extensive depolarization and lack of recovery of leech Retzius neurons caused by 2,4 diaminobutyric acid
| Autor: | Sanjin Kovacevic, Srđan Lopičić, J. Nesovic Ostojic, Marija Stanojevic, Svetolik Spasic, Milica Prostran |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Excitatory Amino Acids Health Toxicology and Mutagenesis Action Potentials Glutamic Acid Leech Aquatic Science 03 medical and health sciences 0302 clinical medicine Leeches Animals Haemopis sanguisuga Neurons chemistry.chemical_classification biology Chemistry Aminobutyrates Glutamate receptor Depolarization biology.organism_classification Amino acid Electrophysiology 030104 developmental biology Excitatory postsynaptic potential Biophysics Microelectrodes Water Pollutants Chemical 030217 neurology & neurosurgery Intracellular |
| Zdroj: | Aquatic Toxicology. 199:269-275 |
| ISSN: | 0166-445X |
| DOI: | 10.1016/j.aquatox.2018.03.036 |
| Popis: | In this paper we present, for the first time, a detailed account of electrophysiological effects of 2,4-diaminobutyric acid (2,4-DABA). 2,4-DABA is a neurotoxic non-protein amino acid produced by Cyanobacteria with a possible link to neurodegenerative disorders in animals and humans. Intracellular recordings were performed on Retzius nerve cells of the leech Haemopis sanguisuga using glass microelectrodes filled with 3 mol/L KCl. Our results show that 2,4-DABA is an excitatory amino acid, causing membrane depolarization in a concentration-dependent manner. The most prominent depolarizations of 39.63 ± 2.22 mV and 47.05 ± 4.33 mV, induced by 5 × 10 − 3 and 10 − 2 mol/L 2,4-DABA respectively, are several times larger than maximal depolarizations induced by either Glutamate, Aspartate, β -N-methylamino-alanine (BMAA) or β -N-oxalylamino-alanine (BOAA) on our model. These 2,4-DABA induced depolarizations evolve through two distinct stages, which is a novel phenomenon in electrical cell activity upon application of an excitatory amino acid, at least on our model. Involvement of two separate mechanisms, suggested by the two stage phenomenon, is discussed in the paper. We also provide evidence that 2,4-DABA induces irreversible functional disturbances in neurons in a concentration-dependent manner, since only half of the cells recovered normal electrical activity after application of 5 × 10 − 3 mol/L 2,4-DABA, and none recovered after application of 10 − 2 mol/L 2,4-DABA. Effects of both L -2,4-DABA and DL -2,4-DABA were tested and are not significantly different. |
| Databáze: | OpenAIRE |
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