title: [Mechanism of CAG regimen eliminating T-cell acute lymphoblastic leukemia A3 cell line].
abstract: The purpose of this study was to explore the mechanism of CAG regimen eliminating T-cell acute lymphoblastic leukemia (T-ALL) A3 cell line and evaluate the role of G-CSF/G-CSFR system in this process. The expression levels of G-CSFR on the A3 cell membrane were detected by flow cytometry. Cell cycle changes of A3 cells treated with different concentrations of G-CSF for 48 hours were examined by propidium iodide staining method. The inhibition and apoptosis rates of A3 cells treated with various combinations of G-CSF, cytarabine (Ara-C), aclarubicin (ACR) were analyzed by Cell Counting Kit and AnnexinV Kit, respectively. The results indicated that the expression level of G-CSFR on A3 cells was 94.2%. The proportion of A3 cells in S-phase rose concomitantly with the increasing of G-CSF concentrations within 0-20 ng/ml. After incubation with Ara-C and G-CSF for 48 hours, A3 cells were inhibited more obviously compared with incubation with Ara-C alone (p<0.05, Ara-C 10(-5) mol/L and 10(-6) mol/L). After incubation with Ara-C, ACR and G-CSF for 48 hours, the apoptotic rate of A3 cells was much more than that after incubation with Ara-C and ACR. It is concluded that the expression level of G-CSFR on A3 cells is high, G-CSF/G-CSFR system has a synergetic effect on eliminating A3 cells when administrated simultaneously with chemical agents. This effect is caused through driving more cells from G0 phase into S phase, increasing sensitivity of A3 cells to chemical drugs and inducing cell apoptosis which may be one of the mechanisms of CAG regimen eliminating A3 cells.
authors.affiliation: The First Hospital, Suzhou University, Jiangsu Institute of Hematology, National Key Laboratory of Thrombosis & Hemostasis, Ministry of Health, Suzhou 215006, Jiangsu Province, China.
authors.forename: Yan-Ling
authors.initials: YL
authors.lastname: Wu
authors.forename: Sheng-Li
authors.initials: SL
authors.lastname: Xue
authors.forename: Ai-Ning
authors.initials: AN
authors.lastname: Sun
authors.forename: Lan
authors.initials: L
authors.lastname: Dai
authors.forename: De-Pei
authors.initials: DP
authors.lastname: Wu
mesh_terms: D015250:Aclarubicin / Q000627:therapeutic use; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D017209:Apoptosis; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D003561:Cytarabine / Q000627:therapeutic use; D016179:Granulocyte Colony-Stimulating Factor / Q000627:therapeutic use; D006801:Humans; D054218:Precursor T-Cell Lymphoblastic Leukemia-Lymphoma / Q000188:drug therapy* / Q000473:pathology*
chemical_list: D003561:Cytarabine; D016179:Granulocyte Colony-Stimulating Factor; D015250:Aclarubicin