Journal Article

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

Miwa Bando, Atsushi Matsuoka, Akihiko Tsuji and Yoshiko Matsuda

in The Journal of Biochemistry

Published on behalf of The Japanese Biochemical Society

Volume 132, issue 1, pages 127-134
Published in print July 2002 | ISSN: 0021-924X
Published online July 2002 | e-ISSN: 1756-2651 | DOI: https://dx.doi.org/10.1093/oxfordjournals.jbchem.a003189
The Proprotein Convertase PACE4 Is Upregulated by PDGF-BB in Megakaryocytes: Gene Expression of PACE4 and Furin Is Regulated Differently in Dami Cells

Show Summary Details

Preview

The differentiation of megakaryocytes into platelets is highly regulated by many cytok-ines 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 megakaryoblastic 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-pi 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.

Keywords: megakaryocytes; PACE4; PDGF-BB; proprotein convertase; transcriptional regulation

Journal Article.  0 words. 

Subjects: Biochemistry

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content. subscribe or login to access all content.