Korean J Lab Med.  2007 Aug;27(4):229-236. 10.3343/kjlm.2007.27.4.229.

Treatment Outcome of Multidrug Resistance Related mRNA Expression and c-Jun-N-Terminal Kinase Activity in Patients with Acute Myeloid Leukemia

• Do JH
• Oh SH
• Song EJ
• Chung JS
• Kang CD
• Lee EY

• KMID: 1781489
• DOI: http://doi.org/10.3343/kjlm.2007.27.4.229

Abstract

BACKGROUND: The multidrug resistance (mdr1), multidrug resistance associated protein (mrp1), and glutathione-s-transferase (gst) pi genes have been associated with treatment failure in acute myeloid leukemia (AML). c-jun N-terminal kinase (JNK) activity is increased in response to chemotherapeutic agent. METHODS: To investigate the significance of multidrug resistance (mdr) parameters and JNK activity, bone marrow or peripheral blood cells from 52 patients with AML were analyzed. RT-PCR was performed for mdr1, mrp1, and gst pi gene expression. JNK expression and activity were measured using an immunoe- nzymatic kinase assay and a western blot method. RESULTS: High level expression of mdr1, mrp1, and gst pi mRNA was observed in 38.5%, 48.1% and 54.3% of AML cases, respectively. The remission rate was significantly low in cases with an older age (>55 yr), a high WBC count, poor chromosomal abnormalities, a high level expression of mdr1 and mrp1. The WBC count and mdr1 mRNA expression were independent predictors for the outcome to induction chemotherapy. There was a shorter duration of overall survival in the patients with an older age, a high WBC count, chromosome aberrations, high level expressions of mdr1 and mrp1 mRNA, and JNK activation. The patient's age, WBC count and chromosomal abnormalities were independent predictors for overall survivals. The majority (28/30) of AML cases did not show any levels of JNK activation except for two cases, which were associated with an extremely high WBC count, chromosomal aberration, high level expressions of mdr1, mrp1 and gst pi mRNA, and treatment resistance. CONCLUSIONS: These data indicate the influences of mdr1 and mrp1 mRNA expression on the clinical outcome of AML to induction chemotherapy. But it will be necessary to investigate further whether blast cells of AML resistant to chemotherapy retain the capacity to activate JNK, and relate to MDR parameters.

Keyword

Drug Resistance; JNK; AML

MeSH Terms

Adolescent
Adult
Aged
*Drug Resistance, Multiple/genetics
*Drug Resistance, Neoplasm/genetics
Female
Glutathione S-Transferase pi/genetics
Humans
JNK Mitogen-Activated Protein Kinases/*metabolism
Leukemia, Myeloid, Acute/*drug therapy/genetics/metabolism
Male
Middle Aged
Multidrug Resistance-Associated Proteins/genetics
P-Glycoprotein/genetics
RNA, Messenger/*metabolism
Reverse Transcriptase Polymerase Chain Reaction
Survival Analysis
Treatment Outcome

Figure

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  Fig. 1. RT-PCR results for mdr1, mrp1, gst π, and β2-microglobulin mRNA (internal control) with KG1 and CCRF-CEM T-cell lines as mdr1 mRNA positive and negative control and normal bone marrow (A). Expression levels of mdr1, mrp1 and gstπ mRNA using RT-PCR in patients with acute myeloid leukemia (B).

• 

  Fig. 2. Immunoblotting of cell lysates of AML patients to analyse c-Jun-N-terminal kinase (JNK) activity and β-actin expression, and JNK activity (phospho c-Jun). JNK activity was undetectable in leukemic samples except 2 cases (middle). P, K562; N, normal bone marrow. Total JNK, 46, 54 kDa; phospho c-Jun, 35 kDa; β-actin; 42 kDa.

Reference

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