title: [STAT5 phosphorylation in CD34(+)CD38(-)CD123(+) bone marrow cells of the patients with myelodysplastic syndrome].
abstract: OBJECTIVE
  To investigate the expressions of STAT5 phosphorylation in CD34(+)CD38(-)CD123(+) bone marrow cells of the patients with myelodysplastic syndromes (MDS), and then evaluate the level of activation of STAT5 associated with cell proliferation in MDS clone cells.
  
  
  METHODS
  The bone marrow mononuclear cells (BMMNC) were extracted from 36 MDS patients and 14 normal controls. The mean fluorescence intensities (MFI) of phosphorylated STAT5(P-STAT5) in CD34(+)CD38(-)CD123(+) and CD34(+)CD38(-)CD123(-)cells, with or without the stimulation of 10 U/ml EPO, were examined by flow cytometry (FCM).
  
  
  RESULTS
  Without stimulation, the P-STAT5 MFI in CD34(+)CD38(-)CD123(+) cells of low/high risk MDS patients was 113.71 ± 67.22/173.05 ± 102.78, which was significantly higher than that of CD34(+)CD38(-)CD123(-) cells (58.84 ± 27.51/68.99 ± 50.42, P < 0.01, P < 0.05) and the normal controls CD34(+)CD38(-)CD123(-) cells (63.06 ± 21.06, P < 0.05), there was no significant difference between the CD34(+)CD38(-)CD123(-) cells of MDS patients and the normal control CD34(+)CD38(-)CD123(-) cells; With the EPO stimulation, the P-STAT5 MFI in CD34(+)CD38(-)CD123(+) cells of low/high risk MDS patients was 144.04 ± 58.11/239.45 ± 152.05, which was significantly higher than that of CD34(+)CD38(-)CD123(-) cells (68.41 ± 25, 10/64.21 ± 23.43, P < 0.01) and the normal controls CD34(+)CD38(-)CD123(-) cells (75.21 ± 27.02, P < 0.01), there was no significant difference between the CD34(+)CD38(-)CD123(-) cells of MDS patients and the normal control CD34(+)CD38(-)CD123(-) cells; The P-STAT5 MFI in the CD34(+)CD38(-)CD123(+) cells of low/high risk MDS patients with or without EPO stimulation were 21.80/28.86, which was significantly higher than that of CD34(+)CD38(-)CD123(-) cells (7.42/5.50, P < 0.01, P < 0.05) and the normal controls CD34(+)CD38(-)CD123(-) cells (6.39, P < 0.05), there was no significant difference between the CD34(+)CD38(-)CD123(-) cells of MDS patients and the normal controls CD34(+)CD38(-)CD123(-) cells; There was no significant difference of P-STAT5 MFI with or without EPO stimulation and the increased P-STAT5 MFI between the CD34(+)CD38(-)CD123(+) cells of low and high risk MDS.
  
  
  CONCLUSIONS
  STAT5 associated with cell proliferation was activated in CD34(+)CD38(-)CD123(+) bone marrow cells in MDS, which had more significant reactions to EPO than CD34(+)CD38(-)CD123(-) cells, indicating that CD34(+)CD38(-)CD123(+) bone marrow cells might be the real malignant MDS clone cells in MDS.
authors.affiliation: Department of Hematology and Oncology, General Hospital, Tianjin Medical University, Tianjin 300052, China.
authors.forename: Bing-nan
authors.initials: BN
authors.lastname: Liu
authors.forename: Rong
authors.initials: R
authors.lastname: Fu
authors.forename: Hua-quan
authors.initials: HQ
authors.lastname: Wang
authors.forename: Li-juan
authors.initials: LJ
authors.lastname: Li
authors.forename: Lan-zhu
authors.initials: LZ
authors.lastname: Yue
authors.forename: Er-bao
authors.initials: EB
authors.lastname: Ruan
authors.forename: Wen
authors.initials: W
authors.lastname: Qu
authors.forename: Yong
authors.initials: Y
authors.lastname: Liang
authors.forename: Guo-jin
authors.initials: GJ
authors.lastname: Wang
authors.forename: Xiao-ming
authors.initials: XM
authors.lastname: Wang
authors.forename: Hong
authors.initials: H
authors.lastname: Liu
authors.forename: Yu-hong
authors.initials: YH
authors.lastname: Wu
authors.forename: Jia
authors.initials: J
authors.lastname: Song
authors.forename: Li-min
authors.initials: LM
authors.lastname: Xing
authors.forename: Jing
authors.initials: J
authors.lastname: Guan
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Zong-hong
authors.initials: ZH
authors.lastname: Shao
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018952:Antigens, CD34 / Q000378:metabolism; D001854:Bone Marrow Cells / Q000166:cytology / Q000378:metabolism*; D049109:Cell Proliferation; D002478:Cells, Cultured; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D008297:Male; D008875:Middle Aged; D009190:Myelodysplastic Syndromes / Q000378:metabolism* / Q000473:pathology; D010766:Phosphorylation; D050799:STAT5 Transcription Factor / Q000378:metabolism*
chemical_list: D018952:Antigens, CD34; D050799:STAT5 Transcription Factor