Repository of Research and Investigative Information

Repository of Research and Investigative Information

Baqiyatallah University of Medical Sciences

The effect of paraoxon on GABA uptake in rat cerebellar synaptosomes

(2007) The effect of paraoxon on GABA uptake in rat cerebellar synaptosomes. Medical Science Monitor. BR194-BR199. ISSN 1643-3750

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Background: The compounds used to treat organophosphate (OP) poisoning are not able to fully alleviate long-lasting effects. They are mainly used to antagonize the cholinergic effects of OPs; however, non-cholinergic effects such as interference with different neurotransmitter systems, especially GABA release and uptake, are now attracting more attention. Material/Methods: Cerebellar synaptosomes were used to investigate any potential interaction between paraoxon and GABA uptake. The cerebella of 250- to 280-g Wistar rats were rapidly dissected out, homogenized, centrifuged, and incubated with 0.004 pM H-3GABA in the presence of different doses of paraoxon for 15 minutes at 37 degrees C. At the end of the incubation period, the synaptosomes were layered in chambers of a superfusion system (UGO). To assay the amount of H-3GABA uptake, radioactivity was measured using a beta-counter (Winspectrul). Results: Mean GABA uptake was 111, 95, 71, 73, and 75 percent of the control values in the presence of paraoxon concentrations of 0.01, 0.1, 1, 10, and 100 mu M, respectively. Accordingly, GABA uptake was significantly reduced at doses 1, 10, and 100 mu M of paraoxon (P < 0.05). Conclusions: Paraoxon may interfere with GABA uptake by cerebellar synaptosomes at micromolar concentrations or higher.

Item Type: Article
Keywords: organophosphate paraoxon cerebellum synaptosome GABA gamma-aminobutyric-acid cerebral-cortex nipecotic acid release inhibition transporter neurons astrocytes glutamate brain Research & Experimental Medicine
Page Range: BR194-BR199
Journal or Publication Title: Medical Science Monitor
Journal Index: ISI
Volume: 13
Number: 9
ISSN: 1643-3750
Depositing User: مهندس مهدی شریفی

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