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Related Experiment Videos

Familial adenomatous polyposis is associated with a marked decrease in alkaline sphingomyelinase activity: a key

E Hertervig1, A Nilsson, J Björk

  • 1Department of Medicine, Lund University Hospital, Sweden.

British Journal of Cancer
|September 25, 1999
PubMed
Summary

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Reduced alkaline sphingomyelinase activity in the colon may promote cancer development. This study found significantly lower enzyme levels in precancerous polyps and surrounding tissue, suggesting a role in colorectal neoplasia.

Area of Science:

  • Biochemistry
  • Oncology
  • Gastroenterology

Background:

  • Sphingomyelin hydrolysis yields molecules crucial for cell growth and apoptosis.
  • Animal models suggest this pathway inhibits colonic malignant transformation.
  • Alkaline sphingomyelinase activity is reduced in colorectal adenocarcinomas.

Purpose of the Study:

  • To investigate sphingomyelinase activity in premalignant colorectal lesions.
  • To determine if reduced sphingomyelinase levels precede neoplastic transformation.
  • To assess enzyme activity in familial adenomatous polyposis (FAP) and sporadic adenomas.

Main Methods:

  • Measured acid, neutral, and alkaline sphingomyelinase activities in tissue samples.
  • Analyzed adenomas and surrounding mucosa from FAP patients, sporadic adenoma patients, and controls.

Related Experiment Videos

  • Assessed alkaline phosphatase activity as a comparative marker.

    • Main Results:

    • Alkaline sphingomyelinase activity was significantly reduced (90%) in FAP adenomas and surrounding mucosa.
    • Acid (66%) and neutral (54%) sphingomyelinase activities were also reduced in FAP adenomas.
    • Sporadic adenomas showed a significant reduction (57%) in alkaline sphingomyelinase activity.

    Conclusions:

    • Markedly reduced alkaline sphingomyelinase activity in FAP adenomas and mucosa may drive unrestrained cell proliferation.
    • This deficiency could be a pathogenic factor in colorectal neoplastic transformation.
    • Sphingomyelinase levels are altered even in the premalignant state of colorectal cancer.