Constitutive and functional expression of runt-related transcription factor-2 by microglial cells

Ryota Nakazato, Takeshi Takarada, Takumi Watanabe, Binh Thanh Nguyen, Shinsuke Ikeno, Eiichi Hinoi, Yukio Yoneda

Research output: Contribution to journalArticle

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Abstract

Runt-related transcription factor-2 (Runx2) is the master regulator of osteoblastogenesis with an ability to promote differentiation of mesenchymal stem cells into the osteoblastic lineage. We have previously shown constitutive and functional expression of Runx2 by astroglial cells. In this study, we investigated the possible expression of Runx2 by both murine microglia and microglial cell line BV-2 cells. Runx2 expression was seen in cultured microglia and BV-2 cells, while sustained exposure to 1 mM ATP led to a significant but transient increase in mRNA and corresponding protein expression of Runx2 within 24 h. The increase in Runx2 expression was invariably prevented by several chemicals with antagonistic properties for P2X7 purinergic receptor, calmodulin and calcineurin in BV-2 cells, with a P2X7 receptor agonist more than quadrupling Runx2 expression. A significant increase in Runx2 expression was seen in osteoclastic cells, but not in osteoblastic or chondrocytic cells, when exposed to a high concentration of ATP. In BV2-cells with control siRNA, a significant decrease was found in the number of cells with at least one process within 3 h after the exposure to 1 mM ATP, followed by an increase up to 24 h. However, Runx2 siRNA significantly deteriorated the property to induce delayed process extension during 6-24 h after exposure to ATP along with drastically decreased Runx2 protein levels. These results suggest that Runx2 is constitutively and functionally expressed by microglial cells with responsiveness to ATP for upregulation in the murine brain.

Original languageEnglish
Pages (from-to)24-35
Number of pages12
JournalNeurochemistry International
Volume74
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

Transcription Factors
Adenosine Triphosphate
Core Binding Factor Alpha 1 Subunit
Purinergic P2X7 Receptors
Microglia
Small Interfering RNA
Calcineurin
Calmodulin
Mesenchymal Stromal Cells
Up-Regulation
Cell Count
Cell Line
Messenger RNA
Brain

Keywords

  • ATP
  • BV-2 cells
  • Calcium
  • Microglia
  • P2X7 receptor
  • Runx2

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Cell Biology
  • Medicine(all)

Cite this

Constitutive and functional expression of runt-related transcription factor-2 by microglial cells. / Nakazato, Ryota; Takarada, Takeshi; Watanabe, Takumi; Nguyen, Binh Thanh; Ikeno, Shinsuke; Hinoi, Eiichi; Yoneda, Yukio.

In: Neurochemistry International, Vol. 74, 2014, p. 24-35.

Research output: Contribution to journalArticle

Nakazato, Ryota ; Takarada, Takeshi ; Watanabe, Takumi ; Nguyen, Binh Thanh ; Ikeno, Shinsuke ; Hinoi, Eiichi ; Yoneda, Yukio. / Constitutive and functional expression of runt-related transcription factor-2 by microglial cells. In: Neurochemistry International. 2014 ; Vol. 74. pp. 24-35.
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