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Related Experiment Videos

Membrane-associated sialidase of rat liver and its decrease in hepatomas.

J Sagawa1, T Miyagi, S Tsuiki

  • 1Biochemistry Laboratory, Tohoku University.

Japanese Journal of Cancer Research : Gann
|January 1, 1988
PubMed
Summary
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Plasma membrane-associated sialidase activity is lower in rat hepatomas compared to normal liver tissue. This study found the enzyme

Area of Science:

  • Biochemistry
  • Enzymology
  • Cancer Research

Background:

  • Plasma membrane-associated sialidases are enzymes involved in cell surface glycoconjugate metabolism.
  • Alterations in sialidase activity have been implicated in various pathological conditions, including cancer.
  • Hepatoma, a form of liver cancer, presents a significant health challenge, necessitating research into its underlying molecular mechanisms.

Purpose of the Study:

  • To characterize the plasma membrane-associated sialidase in normal rat liver and chemically induced or transplantable rat hepatomas.
  • To compare the biochemical properties and substrate specificities of sialidase from normal liver and hepatoma tissues.
  • To investigate potential differences in sialidase activity levels between normal liver and hepatoma.

Main Methods:

Related Experiment Videos

  • Assaying plasma membrane-associated sialidase activity at pH 4.5 using bovine brain mixed gangliosides as substrate.
  • Solubilizing the enzyme from particulate fractions using sodium deoxycholate and Triton X-100.
  • Chromatographing the solubilized enzyme on DEAE-cellulose to assess its homogeneity and behavior.
  • Evaluating substrate preference using various sialidase substrates, including 4-methylumbelliferyl-alpha-N-acetylneuraminic acid, 3'-sialyllactose, and fetuin.

Main Results:

  • Plasma membrane-associated sialidase activity was found to be lower in both 3'-methyl-4-dimethylaminoazobenzene (MeDAB)-induced and AH-109A transplantable rat hepatomas compared to normal rat liver.
  • The enzyme was efficiently solubilized from liver particulate fractions using a combination of sodium deoxycholate and Triton X-100.
  • DEAE-cellulose chromatography revealed a single peak of solubilized sialidase activity, indicating enzyme homogeneity.
  • The purified enzyme exhibited optimal activity at pH 4.5 and preferentially hydrolyzed mixed gangliosides over other tested substrates.
  • Sialidase from MeDAB-induced hepatoma was biochemically indistinguishable from the liver enzyme in terms of solubilization, pH optimum, chromatographic behavior, and substrate specificity.

Conclusions:

  • The plasma membrane-associated sialidase in rat hepatomas is biochemically similar to that found in normal rat liver.
  • The primary difference observed between hepatoma and liver sialidase lies in the overall activity level within the tissue.
  • These findings suggest that altered expression or regulation of an otherwise similar sialidase enzyme may contribute to hepatoma development.