title: [Role of Rheb in Human Acute Myeloid Leukemia].
abstract: OBJECTIVE
  To investigate the role of Rheb (mTOR activator) in AML development by measuring Rheb expression in bone marrow of adult AML patients and in AML cell line HL-60.
  
  
  METHODS
  Real-time PCR assay was used to measure the Rheb mRNA expression in 27 AML patients and 29 ITP patients as control. The relationship between Rheb mRNA expression and age, AML subtype, fusion gene, splenomegaly, hepatomegaly and survival of AML patients was analyzed and compared. In addition, HL-60 cell line over-expressing Rheb was established, and the HL-60 cells and HL-60 cells with overexpression of Rheb were treated with Ara-C of different concentrations, the proliferation level was detected by CCK-8 method, and the IC50 was calculated.
  
  
  RESULTS
  The mRNA level of Rheb in AML patients was similar to that in ITP patients (control). Interestingly, higher expression of Rheb was associated with better survival and was sensitive to Ara-C treatment. However, the expression level of Rheb was not associated with age, AML subtype, fusion gene, and hepatomegaly of patients. Lower expression level of Rheb was associated with splenomegaly. In vitro analysis of HL-60 line indicated that overexpression of Rheb could increased the cell sensitivity to Ara-C treatment (IC50=0.54 µmol/L) and caused HL-60 cell apoptosis.
  
  
  CONCLUSIONS
  The lower Rheb expression is a poor prognostic indicator for AML patients, which is associated with AML splenomegaly, the patients and HL-60 cells with low expression of Rheb are insensitive to Ara-C treatment.
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 30020, China.
authors.forename: Xiao-Min
authors.initials: XM
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 30020, China.
authors.forename: Qiao-Zhu
authors.initials: QZ
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 30020, China.
authors.forename: Ya-Nan
authors.initials: YN
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 30020, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 30020, China.
authors.forename: Ming-Hao
authors.initials: MH
authors.lastname: Li
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 30020, China.
authors.forename: Wan-Zhu
authors.initials: WZ
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 30020, China.
authors.forename: Jiang-Xiang
authors.initials: JX
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 30020, China. E-mail: wpyuan@ihcams.ac.cn.
authors.forename: Wei-Ping
authors.initials: WP
authors.lastname: Yuan
mesh_terms: D000328:Adult; D017209:Apoptosis; D001853:Bone Marrow / Q000378:metabolism; D003561:Cytarabine / Q000494:pharmacology; D018922:HL-60 Cells; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D020559:Monomeric GTP-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D009479:Neuropeptides / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D000076205:Ras Homolog Enriched in Brain Protein; D060888:Real-Time Polymerase Chain Reaction; D013154:Spleen / Q000473:pathology
chemical_list: D009479:Neuropeptides; C490211:RHEB protein, human; D012333:RNA, Messenger; D000076205:Ras Homolog Enriched in Brain Protein; D003561:Cytarabine; D020559:Monomeric GTP-Binding Proteins