The relationship between thiopurine methyltransferase activity and genotype in blasts from patients with acute leukemia.

Abstract:

:The level of expression of the enzyme thiopurine methyltransferase (TPMT) is an important determinant of the metabolism of thiopurines used in the treatment of acute lymphoblastic leukemia (ALL) and acute myeloid leukemia (AML). Studies in red blood cells (RBC) have shown that TPMT expression displays genetic polymorphism with 11% of individuals having intermediate and one in 300 undetectable levels. The genetic basis for this polymorphism has now been elucidated and polymerase chain reaction (PCR)-based assays described for the most common mutations accounting for reduced activity. In previous studies, genotype has been correlated with red blood cell activity. In this report, we describe the relationship between genotype and TPMT activity measured directly in the target of drug action, the leukemic cell. We have demonstrated that the TPMT activity in lymphoblasts from 38 children and adults found by PCR to be homozygotes (*1/*1) was significantly higher than that in the five heterozygotes (*1/*3) detected (median, 0.25 v 0.08, P < .002, Mann-Whitney U). Similar results were obtained when results from children were analyzed separately. However, comparison of activity in blasts from AML and ALL showed a higher level in the former (0.35 v 0.22 nU/mg, P < .002, n = 17, 35), suggesting that factors other than genotype may also influence expression.

journal_name

Blood

journal_title

Blood

authors

Coulthard SA,Howell C,Robson J,Hall AG

subject

Has Abstract

pub_date

1998-10-15 00:00:00

pages

2856-62

issue

8

eissn

0006-4971

issn

1528-0020

journal_volume

92

pub_type

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