Glutamate preferentially suppresses osteoblastogenesis than adipogenesis through the cystine/glutamate antiporter in mesenchymal stem cells.

Mika Takarada-Iemata, Takeshi Takarada, Yukari Kyumoto, Eri Nakatani, Osamu Hori, Yukio Yoneda

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We have shown that glutamate (Glu) signaling machineries, such as receptors (GluR) and transporters, are functionally expressed by mesenchymal stem cells, in addition to by their progeny cells such as osteoblasts and chondrocytes. Sustained exposure to Glu induced significant decreases in alkaline phosphatase (ALP) staining and osteoblastic marker gene expression in the mesenchymal C3H10T1/2 stem cells infected with runt-related transcription factor-2 (Runx2) adenovirus, without markedly affecting Oil Red O staining for adipocytes in cells cultured with adipogenic inducers. In cells with Runx2 adenovirus, the cystine/Glu antiporter substrate cystine significantly prevented the decreases by Glu in both ALP staining and osteoblastic marker gene expression, with GluR agonists being ineffective. In cells with Runx2 adenovirus, Glu significantly decreased [14C]cystine uptake, intracellular glutathione (GSH) level, Runx2 recruitment to osteocalcin promoter and nuclear Runx2 protein level, respectively. Cystine again significantly prevented the decreases by Glu in both GSH levels and Runx2 recruitment. In mouse bone marrow stromal cells, Glu and a GSH depleter significantly decreased ALP staining without affecting Oil Red O staining. Knockdown of the cystine/Glu antiporter led to markedly decreased ALP staining and GSH levels, with concomitant prevention of the decrease by Glu, in cells with Runx2 adenovirus. These results suggest that Glu may play a role as a negative regulator at an early differentiation stage into osteoblasts than adipocytes through a mechanism relevant to nuclear translocation of Runx2 after regulation of intracellular GSH levels by the cystine/Glu antiporter expressed in mesenchymal stem cells.

Original languageEnglish
Pages (from-to)652-665
Number of pages14
JournalJournal of cellular physiology
Volume226
Issue number3
DOIs
Publication statusPublished - Jan 1 2011
Externally publishedYes

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Antiporters
Adipogenesis
Cystine
Stem cells
Mesenchymal Stromal Cells
Glutamic Acid
Staining and Labeling
Adenoviridae
Alkaline Phosphatase
Osteoblasts
Adipocytes
Gene expression
Core Binding Factor Alpha 1 Subunit
Gene Expression
Osteocalcin
Chondrocytes
Nuclear Proteins
Glutathione
Cultured Cells
Bone

All Science Journal Classification (ASJC) codes

  • Physiology
  • Clinical Biochemistry
  • Cell Biology

Cite this

Glutamate preferentially suppresses osteoblastogenesis than adipogenesis through the cystine/glutamate antiporter in mesenchymal stem cells. / Takarada-Iemata, Mika; Takarada, Takeshi; Kyumoto, Yukari; Nakatani, Eri; Hori, Osamu; Yoneda, Yukio.

In: Journal of cellular physiology, Vol. 226, No. 3, 01.01.2011, p. 652-665.

Research output: Contribution to journalArticle

Takarada-Iemata, Mika ; Takarada, Takeshi ; Kyumoto, Yukari ; Nakatani, Eri ; Hori, Osamu ; Yoneda, Yukio. / Glutamate preferentially suppresses osteoblastogenesis than adipogenesis through the cystine/glutamate antiporter in mesenchymal stem cells. In: Journal of cellular physiology. 2011 ; Vol. 226, No. 3. pp. 652-665.
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