Predominant Shift of Different P44-Expressing Anaplasma phagocytophilum in Infected HL-60, THP-1, NB4, and RF/6A Cell Lines

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  • Shimada Masahiko
    Graduate Program in Pharmaceutical and Nutritional Sciences, Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka
  • Takamoto Naoya
    Graduate Program in Pharmaceutical and Nutritional Sciences, Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka
  • Su Hongru
    Graduate Program in Pharmaceutical and Nutritional Sciences, Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka
  • Sasahara Haruka
    Graduate Program in Pharmaceutical and Nutritional Sciences, Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka
  • Shimamura Yuko
    Graduate Program in Pharmaceutical and Nutritional Sciences, Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka
  • Ando Shuji
    Department of Virology I, National Institute of Infectious Diseases
  • Ohashi Norio
    Graduate Program in Pharmaceutical and Nutritional Sciences, Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka

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タイトル別名
  • Predominant Shift of Different P44-Expressing <i>Anaplasma phagocytophilum</i> in Infected HL-60, THP-1, NB4, and RF/6A Cell Lines
  • Predomination shift of different P44-expressing Anaplasma phagocytophilum in infected HL-60, THP-1, NB4, and RF/6A cell lines

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<p> Anaplasma phagocytophilum, an agent of human granulocytic anaplasmosis, is an obligatory intracellular bacterium that dominantly produces P44 outer membrane proteins encoded by the p44/msp2 multigene family, which are major antigens for serodiagnosis. However, A. phagocytophilum antigens from cultures with different cell lines seem to have varying reactivities with sera. In this study, we performed RNA-seq to investigate the P44 expression of A. phagocytophilum propagated in 4 cell lines. In infected HL-60 cells, the P44-2b transcript was predominant in the first RNA-seq analysis (HL-60.1). However, the P44-23 transcript was predominant in the second RNA-seq analysis at 1 month after additional passages (HL-60.2). We further analyzed the P44 expression of A. phagocytophilum cultured in THP-1, NB4, and RF/6A cells through consecutive passages in the same cell lines for 1 year after transferring A. phagocytophilum from infected HL-60 cells to the respective cell lines. In the long-term cultures, P44-18, P44-78, and P44-51 were predominantly transcribed in infected THP-1, NB4, and RF/6A cells, respectively. Therefore, the predominant shifts of different P44-expressing transcripts of A. phagocytophilum might occur during cell culture even in the same cell line at different time points of sample harvest (HL-60.1 and HL-60.2), which may be attributed to host cell adaptation/selection/interaction.</p>

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