title: [Effect of the NHE-1-specific inhibitor DMA on pHi, proliferation and apoptosis of HL-60/ADM cells in vitro].
abstract: The aim of this study was to evaluate the effect of dimethyl amiloride (DMA), a specific inhibitor of Na(+)/H(+) exchanger-1 (NHE-1), on intracellular pH value (pHi), proliferation and apoptosis of HL-60/ADM cells in vitro. After treatment with DMA at different doses, pHi of HL-60 and HL-60/ADM cell lines were determined by using pH-sensitive fluorescence dye BECEF-AM; the rate of growth inhibition of cells was detected with MTT assay; cell cycle was detected by flow cytometric DNA analysis; cell apoptosis was observed with terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL). The results showed that pHi in HL-60/ADM cells was higher than that in HL-60 cells. After treatment with DMA at different doses, pHi decreased, the rate of growth inhibition and the rate of apoptotic cells in HL-60/ADM cells were all higher than those in HL-60 cells. Meanwhile, after treatment with DMA during 100 micromol/L to 150 micromol/L, the increase amplitude of G(0)/G(1) phase cells and the decrease amplitude of S + G(2)/M cells in HL-60/ADM cells were higher than those in HL-60 cells. It is concluded that by causing intracellular acidification, the NHE-1-specific inhibitor DMA inhibits proliferation of HL-60/ADM cells and induces apoptosis of HL-60/ADM cells, and the degree of this growth inhibition of HL-60/ADM cells is higher than that of HL-60 cells.
authors.affiliation: Department of Hematology, Xinqiao Hospital, The Third Military Medical University, Chongqing 400037, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Chang
authors.forename: Pei-Yan
authors.initials: PY
authors.lastname: Kong
authors.forename: Xing-Hua
authors.initials: XH
authors.lastname: Chen
authors.forename: Xian-Gui
authors.initials: XG
authors.lastname: Peng
authors.forename: Lin
authors.initials: L
authors.lastname: Liu
authors.forename: Hong
authors.initials: H
authors.lastname: Liu
authors.forename: Dong-Feng
authors.initials: DF
authors.lastname: Zeng
authors.forename: Xue
authors.initials: X
authors.lastname: Liang
authors.forename: Qing-Yu
authors.initials: QY
authors.lastname: Wang
mesh_terms: D000584:Amiloride / Q000031:analogs & derivatives* / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects*; D002453:Cell Cycle / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects*; D004317:Doxorubicin / Q000494:pharmacology; D019008:Drug Resistance, Neoplasm; D018922:HL-60 Cells; D006801:Humans; D006863:Hydrogen-Ion Concentration; D017923:Sodium-Hydrogen Exchangers / Q000037:antagonists & inhibitors*
chemical_list: D017923:Sodium-Hydrogen Exchangers; C069139:growth factor-activatable Na-H exchanger NHE-1; C039465:5-dimethylamiloride; D000584:Amiloride; D004317:Doxorubicin