title: [Effects of c-myc antisense oligodeoxynucleotide on the telomerase activity and the induction of apoptosis in HL-60 cells].
abstract: To investigate the effects of c-myc antisense oligodeoxynucleotide (ASODN) on the telomerase activity and the induction of apoptosis in HL-60 cells, and to explore the relationship between the telomerase activity and the expression of c-myc gene in HL-60 cells, after treatment by c-myc ASODN, the expression of c-myc was detected by RT-PCR, the apoptosis, cell cycle were detected with agarose gel electrophoresis and flow cytomety, and the telomerase activity was determined with TRAP-ELISA. The results showed that after blocking c-myc gene with ASODN for 72 hours, it is obvious that the expression of c-myc gene was inhibited. The percentage of S phase HL-60 cells decreased from 55.6% to 30%, the early apoptosis peak appeared (the percentage of apoptosis cells were 25.2%) and the DNA ladders were shown. OD(450 - 690) were 2.648 +/- 0.42, 2.324 +/- 0.36, 2.162 +/- 0.38, 1.952 +/- 0.14, 1.805 +/- 0.40, 1.616 +/- 0.41 and 2.466 +/- 0.29, respectively, as the cells were treated with 0, 1, 2, 3, 4, 5 micromol/L ASODN and 5 micromol/L SODN for 72 hours. The difference was significant when compared 3, 4, 5 micromol/L groups with 0 micromol/L ASODN group respectively (P < 0.05), but the difference was no significant when compared 1, 2 micromol/L ASODN and 5 micromol/L SODN groups with 0 micromol/L ASODN group (P > 0.05). It is concluded that the c-myc gene ASODN may induce the apoptosis of cells, inhibit cells from G(1) phase into S phase and regulate the telomerase activity down in HL-60 cells by blocking the expression of c-myc gene.
authors.affiliation: Department of Hematology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Sun
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Sun
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Le
authors.forename: Lin-Xiang
authors.initials: LX
authors.lastname: Liu
authors.forename: Yan-Fang
authors.initials: YF
authors.lastname: Liu
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.forename: Yi-Hao
authors.initials: YH
authors.lastname: Wang
authors.forename: Hong-Yan
authors.initials: HY
authors.lastname: Ma
authors.forename: Qin-Xian
authors.initials: QX
authors.lastname: Zhang
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D005434:Flow Cytometry; D018922:HL-60 Cells; D006801:Humans; D016376:Oligonucleotides, Antisense / Q000235:genetics / Q000494:pharmacology*; D016271:Proto-Oncogene Proteins c-myc / Q000096:biosynthesis* / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D019098:Telomerase / Q000378:metabolism*
chemical_list: C489427:MYC protein, human; D016376:Oligonucleotides, Antisense; D016271:Proto-Oncogene Proteins c-myc; D012333:RNA, Messenger; D019098:Telomerase