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Role of CD9 in proliferation and proangiogenic action of human adipose-derived mesenchymal stem cells

  • Cell and Molecular Physiology
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Pflügers Archiv - European Journal of Physiology Aims and scope Submit manuscript

Abstract

CD9 belongs to the tetraspanin family and is involved in cell motility, osteoclastogenesis, metastasis, neurite outgrowth, myotube formation, and sperm–egg fusion. CD9 also promotes juxtacrine signaling involved in proliferation and attachment. Varying degrees of CD9 expression have been found in human mesenchymal stem cells. In this study, we determined the functional roles of CD9 in human adipose-derived mesenchymal stem cells (hASCs). The CD9 expression in hASCs was down-regulated during culture expansion. A colony-forming unit assay revealed that the clonal expandability of hASCs was directly correlated with the CD9 expression level of the colony. The CD9(high) cells exhibited an increased ability to proliferate, increased cell adhesiveness, and better in vitro tube formation than the CD9(low) cells. The cellular proliferation and attachment of the CD9(high) cells were inhibited upon treatment with a blocking antibody against CD9 and the transduction of a CD9 miRNA lentivirus. The CD9(high) cells showed higher NF-κB promoter activity and higher levels of intercellular adhesion molecule 1 than the CD9(low) cells. Reverse transcription-polymerase chain reaction analysis revealed higher endothelial nitric oxide synthase expression in the CD9(high) cells than in the CD9(low) cells. The engraftment and the proangiogenic action of hASCs in a murine model of hindlimb ischemia were significantly higher in the CD9(high) cells than in the CD9(low) cells. This study indicates that CD9 plays roles in cell proliferation and attachment in vitro as well as in in vivo engraftment and that it can be considered as a useful marker to predict the in vivo efficacy of hASCs.

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Acknowledgment

This work was supported by a grant (S06022HTB2580A) from the Korean Food & Drug Administration.

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Correspondence to Jin Sup Jung.

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Kim, Y.J., Yu, J.M., Joo, H.J. et al. Role of CD9 in proliferation and proangiogenic action of human adipose-derived mesenchymal stem cells. Pflugers Arch - Eur J Physiol 455, 283–296 (2007). https://doi.org/10.1007/s00424-007-0285-4

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