title: [Expression and Subcellular Distribution of Costimulatory Molecules B7-H1,B7-H3 and B7-H4 in Human Hematologic Malignancy Cell Lines].
abstract: OBJECTIVE
  To investigate the expression and subcellular distribution of costimulatory molecules B7-H1, B7-H3 and B7-H4 in human hematologic malignancy cell lines.
  
  
  METHODS
  The expression and subcellular distribution of B7-H1, B7-H3 and B7-H4 in 13 human hematologic malignancy cell lines were determined by RT-PCR, qPCR, Western blot and flow cytometry, the peripheral blood mononuclear cells (PB MNC) of 12 volunteers were used as control.
  
  
  RESULTS
  The mRNA of B7-H1, B7-H3 and B7-H4 was widely expressed in PB MNC and hematologic malignancy cell lines, with a lower level of B7-H4. The mRNA expression of 3 molecules was highest in Maver, Z138, and HL-60, respectively, while among them the B7-H3 and B7-H4 had no expression in CZ1. The nuclear and cytoplasmic protein of 3 costimulatory molecules abnormally overexpressed only in hematologic malignancy cell lines, with the highest level in U937, Z138, and Raji, respectively, while the B7-H3 and B7-H4 had no expression in CZ1. There were differences among mRNA expression, nuclear and cytoplasmic protein expression of 3 molecules in cell lines derived from the same type of tumor, but the differences of expression in mRNA and protein levels were not exactly the same. The B7-H3 expression abundance in membrane localization was higher in U937, Maver and Z138, while the membrane protein of B7-H1 and B7-H4 had no or low expression in 13 cell lines.
  
  
  CONCLUSIONS
  The mRNA expression of costimulatory molecules B7-H1, B7-H3 and B7-H4 can be widely detected. The protein level of 3 costimulatory molecules abnormally overexpressed only in hematologic malignancy cell lines, moreover the subcellular localizations mostly was found in nucleus and cytoplasm, while the membrane protein expresses in low level or had no expression. There are differences among the expression of 3 molecules in cell lines derived from the same type of tumor.
authors: Department of Hematology, Peking University Third Hospital, Beijing 100191, China.
authors: Wei
authors: W
authors: Zhang
authors: Department of Hematology, Peking University Third Hospital, Beijing 100191, China.
authors: Jing
authors: J
authors: Wang
authors: Department of Hematology, Peking University Third Hospital, Beijing 100191, China.
authors: Yan-Fang
authors: YF
authors: Wang
authors: Department of Hematology, Peking University Third Hospital, Beijing 100191, China.
authors: Ming-Xia
authors: MX
authors: Zhu
authors: Department of Hematology, Peking University Third Hospital, Beijing 100191, China.
authors: Wen-Li
authors: WL
authors: Wan
authors: Department of Hematology, Peking University Third Hospital, Beijing 100191, China.
authors: Hai-Shen
authors: HS
authors: Li
authors: Department of Hematology, Peking University Third Hospital, Beijing 100191, China.
authors: Fei-Fei
authors: FF
authors: Wu
authors: Department of Hematology, Peking University Third Hospital, Beijing 100191, China.
authors: Xin-Xing
authors: XX
authors: Yan
authors: Department of Hematology, Peking University Third Hospital, Beijing 100191, China. E-mail: xykbysy@163.com.
authors: Xiao-Yan
authors: XY
authors: Ke
mesh_terms: D060890:B7-H1 Antigen; D045744:Cell Line, Tumor; D003593:Cytoplasm; D005434:Flow Cytometry; D019337:Hematologic Neoplasms; D006801:Humans; D007963:Leukocytes, Mononuclear
chemical_list: D060890:B7-H1 Antigen; C423236:CD274 protein, human