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Published on: April 26, 2018
Ammonium chloride influences in vitro-neuronal network activity
Clara-Sophie Schwarz1, Stefano Ferrea, Kim Quasthoff
1Department of Neurology, Heinrich-Heine University Düsseldorf, Moorenstr. 5, 40225 Düsseldorf, Germany. clara-sophie.schwarz@uni-duesseldorf.de
Ammonia exposure in hepatic encephalopathy (HE) disrupts neuronal network activity, increasing global activity and suppressing synchrony. Blocking N-methyl-d-aspartic acid (NMDA) receptors may offer a protective strategy against these HE-related network changes.
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- Hepatic encephalopathy (HE) involves functional brain alterations.
- Ammonia accumulation is a key factor in HE pathogenesis.
- Understanding ammonia's impact on neuronal networks is crucial for developing treatments.
Purpose of the Study:
- To investigate ammonia-induced functional changes in in vitro neuronal networks.
- To identify potential counteracting strategies for ammonia-induced neurotoxicity.
- To explore the roles of astrocytic glutamine metabolism and NMDA-receptor function in HE.
Main Methods:
- Recording of rat cortical cell activity using microelectrode arrays (MEAs).
- Exposure to ammonium chloride to induce changes in neuronal network activity.
- Application of glutamine synthetase (GS) inhibitor (methionine-sulfoximine) and NMDA-receptor antagonist (DL-2-Amino-5-phosphono-pentanoic acid).
Main Results:
- Ammonium chloride exposure increased global network activity and suppressed network synchrony.
- Inhibiting GS prevented the increase in global activity but not synchrony suppression.
- Blocking NMDA-receptors prevented both increased activity and desynchronization.
Conclusions:
- MEA technology is valuable for studying in vitro neuronal connectivity changes relevant to HE.
- Astrocytic glutamine metabolism contributes to increased global activity, not synchrony loss.
- NMDA-receptor overactivation may drive HE-related network dysfunction, suggesting NMDA-receptor blockade as a potential therapeutic approach.
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