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hyperammonemia/potassium

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The hyperinsulinism/hyperammonemia (HI/HA) syndrome is caused by "gain of function" of glutamate dehydrogenase (GDH). Several missense mutations have been found; however, cell behaviors triggered by the excessive GDH activity have not been fully demonstrated. This study was aimed to clarify
The calcium-dependent, high (65 mM) potassium-evoked release of the L-glutamate analogue [3H]D-aspartate (D-Asp) was measured in hippocampal slices derived from rats with (a) hepatic encephalopathy (HE) induced with a hepatotoxin, thioacetamide, (b) hyperammonemia produced by i.p. administration of
Hyperammonemia causes glutamine accumulation and astrocyte swelling. Inhibition of glutamine synthesis reduces ammonia-induced edema formation and watery swelling in astrocyte processes. Ordinarily, astrocytes tightly control extracellular K+ activity [K+]e. We tested the hypothesis that acute
In the brain hyperammonemia interferes with ion homeostasis, membrane potentials, neurotransmission, and neurotransmitter recycling and reduces metabolic rates for oxygen and glucose. Because, cerebral blood flow (CBF) is closely coupled to metabolism, CBF is most often reduced in diseases

Hyperammonemia in distal renal tubular acidosis: is it more common than we think?

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The hyperammonemia in distal renal tubular acidosis, previously only described in two cases, is considered an unusual occurrence. After the report published in 2005, we observed plasma ammonia levels above normal range during metabolic decompensation in two other consecutive pediatric patients
Acute hyperammonemia (HA) causes cerebral edema and brain damage in children with urea cycle disorders (UCDs) and in patients in acute liver failure. Chronic HA is associated with developmental delay and mental retardation in children with UCDs, and with neuropsychiatric symptoms in patients with
Binding of the ligand [3H]MK-801 to the MK-801 binding site of the N-methyl-D-aspartate (NMDA) receptor population on brain homogenates in rabbits was studied during experimental encephalopathy from acute liver failure and from acute hyperammonemia in the rabbit. Homogenates were prepared from brain
The correlation among hyperammonemia, brain neutral amino acid, and encephalopathy induced by cyanide was investigated in mice. Subcutaneous injection of 10 mg/kg of potassium cyanide increased the levels of blood ammonia by 2.5-fold as compared to those of the corresponding controls and caused loss
In experimental hepatic encephalopathy and hyperammonemia, extracellular levels of glutamate are increased in hippocampus and cerebral cortex. It has been suggested that overstimulation of glutamate receptors causes a pathological entry of calcium into neurons via receptor-operated (NMDA- and
Neuronal and glial cell marker proteins were quantified in order to evaluate the possibility of increased proteolysis in the brain of rabbits with acute liver failure and acute hyperammonemia. Acute liver failure was induced by a two-stage devascularization procedure. Acute hyperammonemia was
Hyperammonemia is thought to be important in the pathogenesis of hepatic encephalopathy. However, the mechanism leading to ammonia toxicity is still not known. Since the metabolism of the most important excitatory neurotransmitter, glutamate, is closely linked to that of ammonia, it has been
Ammonia is a ubiquitous waste product of protein metabolism that can accumulate in numerous metabolic disorders, causing neurological dysfunction ranging from cognitive impairment to tremor, ataxia, seizures, coma and death. The brain is especially vulnerable to ammonia as it readily crosses the
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