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P-glycoprotein quantitation in acute leukemia.
Mahin Nikougoftar1, M Farhadi, A A Pourfathollah
1Iranian Blood Transfusion Organization and Tarbiyat Modarres University, School of Medicine, Tehran, Iran.
Iranian Journal of Allergy, Asthma, and Immunology
|February 16, 2007
Summary
P-glycoprotein (P-gp), a key factor in multidrug resistance, was found in one-fifth of leukemia patients, particularly in Acute Undifferentiated Leukemia and Acute Myelogenous Leukemia. Higher P-gp levels correlated with relapse and specific cell markers.
Area of Science:
- Hematology
- Oncology
- Molecular Biology
Background:
- Multidrug resistance (MDR) significantly complicates cancer and hematological malignancy treatment.
- Decreased intracellular drug accumulation, often due to P-glycoprotein (P-gp) efflux pumps, is a primary mechanism of MDR.
- P-gp, a 170 kDa transmembrane protein, is overexpressed in drug-resistant cells.
Purpose of the Study:
- To identify the presence and prevalence of P-gp in acute leukemia patients.
- To investigate the correlation between P-gp expression and leukemia subtypes, FAB classification, immunophenotyping, and clinical parameters.
- To quantify P-gp accumulation using Mean Fluorescence Intensity (MFI) and its relation to treatment response.
Main Methods:
- Flow cytometry was used to detect P-gp expression via FITC-conjugated anti-P-gp staining.
- Immunophenotype analysis and French, American, British (FAB) classification were performed.
- Mean Fluorescence Intensity (MFI) was measured to quantify P-gp accumulation on blast cells.
Main Results:
- P-gp expression was identified in approximately 20% of acute leukemia patients.
- P-gp positivity was more frequent in Acute Undifferentiated Leukemia (AUL) and Acute Myelogenous Leukemia (AML) compared to Acute Lymphoblastic Leukemia (ALL).
- A linear relationship was observed between P-gp expression and CD34/CD7 markers, with higher MFI in relapsed patients.
Conclusions:
- P-gp expression is a relevant phenotype in acute leukemia, associated with specific subtypes and cell markers.
- Increased P-gp accumulation, indicated by higher MFI, is linked to disease relapse.
- Understanding P-gp expression can inform therapeutic strategies for overcoming drug resistance in leukemia.
