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The pathogenesis of hepatic encephalopathy
1Department of Pathology, North Shore University Hospital, Cornell University Medical College, Manhasset, NY 11030.
Annals of Clinical and Laboratory Science
|March 1, 1990
Summary
Hepatic encephalopathy (HE) involves complex biochemical issues. Gut-absorbed gamma-aminobutyric acid (GABA) may inhibit brain function, suggesting GABA receptor antagonists could treat HE symptoms.
Area of Science:
- Neuroscience
- Hepatology
- Biochemistry
Background:
- Hepatic encephalopathy (HE) presents complex clinicopathological challenges.
- Biochemical derangements in the liver, blood, and brain are known, but the exact cause of central nervous system dysfunction is unclear.
- Ammonia is a suspected neurotoxin, potentially acting with other toxins.
Purpose of the Study:
- To explore the pathogenetic mechanisms of central nervous system dysfunction in hepatic encephalopathy.
- To investigate the role of ammonia and amino acid imbalances in HE.
- To evaluate the hypothesis that gut-derived gamma-aminobutyric acid (GABA) affects brain function in HE.
Main Methods:
- Review of existing clinical and laboratory data on HE pathogenesis.
- Analysis of biochemical derangements and neurotransmitter imbalances.
- Consideration of the impact of gut-derived substances on brain function.
Main Results:
- Ammonia is implicated as a neurotoxin, possibly acting synergistically with other toxins.
- Amino acid imbalances can disrupt the balance of inhibitory and excitatory neurotransmitters.
- A hypothesis suggests gut-absorbed gamma-aminobutyric acid (GABA) may inhibit brain function in HE.
Conclusions:
- The precise mechanism of CNS dysfunction in HE requires further determination.
- Gamma-aminobutyric acid (GABA) absorbed from the gut may play a significant role in HE pathogenesis.
- Drugs targeting the GABA-benzodiazepine receptor show potential for symptomatic treatment of HE.