Multidrug resistance P-glycoprotein function of bone marrow hematopoietic cells and the reversal agent effect

Journal of Tongji Medical University = Tong Ji Yi Ke Da Xue Xue Bao
Z ChenR Ohno

Abstract

The multidrug resistance P-glycoprotein (P-gp) expression and function in hematopoietic stem/progenitor cells were studied to investigate whether the inhibition of hematopoietic cell P-gp function by multidrug resistance reversal agent increases the cytotoxicity of chemotherapy drugs on the hematopoietic cells. The expression of P-gp on the surface of CD34+ cells from healthy human marrow was examined by flow cytometry. The multidrug resistance reversal agent MS-209 was used to measure the effects of MS-209 on the Rhodamin-123 uptaking of CD34+ hematopoietic cells. By using methylcellulose semi-solid culture, normal human granulocyte-macrophage clonal formation unit (CFU-GM) was cultured. The changes in CFU-GM inhibitory rate caused by daunorubicin were determined in the presence or absence of MS-209. The results showed that the P-gp expression rate of bone marrow CD34+ cells was 13.3%. MS-209 obviously increased the Rhodamin-123 uptake of CD34+ positive cells. The mean inhibitory rate of daunorubicin for CFU-GM was 29.6%, but it was increased to 43.3% in the presence of MS-209 with the difference being significant (P < 0.05). It was concluded that hematopoietic cells expressed P-gp protein and possessed active function. MS-209...Continue Reading

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