Osteopontin is a myosphere-derived secretory molecule that promotes angiogenic progenitor cell proliferation through the phosphoinositide 3-kinase/Akt pathway

Takehiro Ogata, Tomomi Ueyama, Tetsuya Nomura, Satoshi Asada, Masashi Tagawa, Tomoyuki Nakamura, Tomosaburo Takahashi, Hiroaki Matsubara, Hidemasa Oh

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We have reported that skeletal myosphere-derived progenitor cells (MDPCs) can differentiate into vascular cells, and that MDPC transplantation into cardiomyopathic hearts improves cardiac function. However, the autocrine/paracrine molecules and underlying mechanisms responsible for MDPC growth have not yet been determined. To explore the molecules enhancing the proliferation of MDPCs, we performed serial analysis of gene expression and signal sequence trap methods using RNA isolated from MDPCs. We identified osteopontin (OPN), a secretory molecule, as one of most abundant molecules expressed in MDPCs. OPN provided a proliferative effect for MDPCs. MDPCs treated with OPN showed Akt activation, and inhibition of the phosphoinositide 3-kinase (PI3K)/Akt pathway repressed the proliferative effect of OPN. Furthermore, OPN-pretreated MDPCs maintained their differentiation potential into endothelial and vascular smooth muscle cells. These findings indicate an important role of OPN as an autocrine/paracrine molecule in regulating the proliferative growth of muscle-derived angiogenic progenitor cells via the PI3K/Akt pathway.

Original languageEnglish
Pages (from-to)341-347
Number of pages7
JournalBiochemical and Biophysical Research Communications
Volume359
Issue number2
DOIs
Publication statusPublished - Jul 27 2007
Externally publishedYes

Fingerprint

Osteopontin
1-Phosphatidylinositol 4-Kinase
Cell proliferation
Phosphatidylinositols
Phosphotransferases
Stem Cells
Cell Proliferation
Molecules
Muscle
Cell growth
Protein Sorting Signals
Gene expression
Chemical activation
Cells
RNA
Cell Transplantation
Growth
Vascular Smooth Muscle
Smooth Muscle Myocytes
Blood Vessels

Keywords

  • Differentiation
  • Osteopontin
  • Progenitor cells
  • Proliferation
  • Skeletal muscle

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

Osteopontin is a myosphere-derived secretory molecule that promotes angiogenic progenitor cell proliferation through the phosphoinositide 3-kinase/Akt pathway. / Ogata, Takehiro; Ueyama, Tomomi; Nomura, Tetsuya; Asada, Satoshi; Tagawa, Masashi; Nakamura, Tomoyuki; Takahashi, Tomosaburo; Matsubara, Hiroaki; Oh, Hidemasa.

In: Biochemical and Biophysical Research Communications, Vol. 359, No. 2, 27.07.2007, p. 341-347.

Research output: Contribution to journalArticle

Ogata, Takehiro ; Ueyama, Tomomi ; Nomura, Tetsuya ; Asada, Satoshi ; Tagawa, Masashi ; Nakamura, Tomoyuki ; Takahashi, Tomosaburo ; Matsubara, Hiroaki ; Oh, Hidemasa. / Osteopontin is a myosphere-derived secretory molecule that promotes angiogenic progenitor cell proliferation through the phosphoinositide 3-kinase/Akt pathway. In: Biochemical and Biophysical Research Communications. 2007 ; Vol. 359, No. 2. pp. 341-347.
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