The Proprotein Convertase PACE4 Is Upregulated by PDGF-BB in Megakaryocytes: Gene Expression of PACE4 and Furin Is Regulated Differently in Dami Cells.

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  • Bando Miwa
    Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima
  • Matsuoka Atsushi
    Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima
  • Tsuji Akihiko
    Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima
  • Matsuda Yoshiko
    Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima

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  • Proprotein Convertase PACE4 Is Upregulated by PDGF BB in Megakaryocytes Gene Expression of PACE4 and Furin Is Regulated Differently in Dami Cells

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The differentiation of megakaryocytes into platelets is highly regulated by many cytokines and growth factors. PACE4 and furin are Ca2+-dependent serine endoproteases belonging to the subtilisin-like proprotein convertase (SPC) family. These enzymes are involved in the proteolytic activation of proteins that play essential roles in cell growth and differentiation. In this study, we examined the expression of PACE4 and furin during the differentiation of megakatyoblastic cell lines, Dami and HEL cells, induced by phorbol 12-myristate 13-acetate (PMA). PMA stimulates not only the expression of platelet-derived growth factor-B (PDGF-B) mRNA, but also PACE4 mRNA in these cell lines. The expression of PACE4 transcripts (both the PACE4A and PACE4C/CS isoforms) was upregulated more than 4-fold by PMA. Moreover, direct treatment with PDGF-BB also resulted in an increase in the level of PACE4 mRNA. Further, the effect of PDGF-BB on PACE4 expression was confirmed by promoter assay of the PACE4 gene. Although the furin mRNA level was increased by TGF-/β1 in Dami cells, it was not affected by PDGF-BB. These results indicate for the first time that PACE4 expression is specifically upregulated by PDGF-BB in differentiated megakaryoblasts, suggesting a unique role for PACE4 in platelet production.

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