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Thiopurine methyltransferase activity in a Spanish population sample: decrease of enzymatic activity in multiple

C Menor1, J Fueyo, O Escribano

  • 1Departamento de Bioquímica y Biología Molecular, Universidad de Alcalá, Alcalá de Henares, Spain.

Multiple Sclerosis (Houndmills, Basingstoke, England)
|July 18, 2002
PubMed
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This study analyzed thiopurine methyltransferase (TPMT) activity in 3640 Spanish individuals. TPMT activity was significantly lower in multiple sclerosis patients compared to controls, suggesting implications for azathioprine therapy.

Area of Science:

  • Pharmacogenetics
  • Clinical Chemistry
  • Immunology

Background:

  • Thiopurine methyltransferase (TPMT) is crucial for metabolizing thiopurine drugs.
  • Understanding TPMT activity distribution is vital for personalized medicine, particularly in autoimmune diseases.
  • Previous studies on TPMT activity have primarily focused on North American populations.

Purpose of the Study:

  • To determine the frequency distribution histogram of TPMT activity in a Spanish population.
  • To compare TPMT activity across different patient groups, including Crohn's disease, ulcerative colitis, and multiple sclerosis (MS).
  • To investigate the influence of autoimmune diseases on TPMT enzymatic activity.

Main Methods:

  • Analysis of 3640 Spanish clinical laboratory samples.

Related Experiment Videos

  • Measurement of TPMT activity in red blood cells (RBCs) using a radiochemical method.
  • Statistical comparison of TPMT activity between donor and patient groups.

    • Main Results:

    • The Spanish population exhibits a normal distribution of TPMT activity (0-41 U/ml RBCs).
    • TPMT activity was similar in healthy donors, Crohn's disease, and ulcerative colitis patients.
    • A significant decrease in TPMT activity was observed in multiple sclerosis patients compared to healthy donors (p<0.0001).

    Conclusions:

    • The TPMT activity distribution in the Spanish population more closely resembles that of the Jewish population in Israel than North American populations.
    • Reduced TPMT activity in MS patients may necessitate adjustments in azathioprine dosing for this group.
    • These findings highlight the importance of population-specific pharmacogenetic data for optimizing thiopurine drug therapy.