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Related Experiment Videos

Synaptic membrane complex carbohydrates in experimental hepatic encephalopathy.

M Rössle1, F P Winstanley, K Haag

  • 1Liver Diseases Section, NIDDK, National Institutes of Health, Bethesda, Maryland 20892.

Metabolic Brain Disease
|September 1, 1990
PubMed
Summary

Hepatic encephalopathy (HE) alters brain synaptic membranes. Studies show increased lipid-bound sialic acid and a specific protein in HE models, suggesting altered brain function.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Pathology

Background:

  • Hepatic encephalopathy (HE) is a complex neurological complication of liver failure.
  • Synaptic plasma membranes (SPMs) play a crucial role in neurotransmission.
  • Alterations in SPM composition may underlie the neurological deficits observed in HE.

Purpose of the Study:

  • To investigate changes in synaptic plasma membrane (SPM) composition in a rabbit model of hepatic encephalopathy (HE).
  • To analyze lipid-bound sialic acid, protein-bound sialic acid, gangliosides, and protein profiles in SPMs during HE.

Main Methods:

  • Induction of fulminant hepatic failure using galactosamine in rabbits.
  • Biochemical analysis of synaptic plasma membranes (SPMs) isolated from rabbit brains.

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  • Chromatographic and electrophoretic techniques to assess ganglioside and protein composition.

    • Main Results:

    • No significant changes in ganglioside patterns or protein-bound sialic acid were observed in HE.
    • A 20% increase in lipid-bound sialic acid concentration was detected in SPMs from rabbits with HE.
    • Electrophoretic analysis revealed an increased concentration of a ~70 kDa protein in SPMs during HE.

    Conclusions:

    • Synaptic plasma membrane (SPM) composition is altered in a model of hepatic encephalopathy (HE).
    • Increased lipid-bound sialic acid and a specific 70 kDa protein may contribute to abnormal neurotransmission in HE.
    • These findings suggest that nonhumoral factors, like altered glycolipid sialylation, could play a role in HE pathogenesis.