P2X7-induced zeiosis promotes osteogenic differentiation and mineralization of postmenopausal bone marrow-derived mesenchymal stem cells

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Noronha Matos, JB (Author) FMUP; Coimbra, J (Author) Other; Sa e Sousa, A (Author) FMUP; Rocha, R (Author) Other; Marinhas, J (Author) Other; Freitas, R (Author) Other; Guerra Gomes, S (Author) Other; Ferreirinha, F (Author) Other; Costa, MA (Author) Other; Paulo Correia de Sá (Author) ICBAS

Journal

Title: FASEB Journal

Vol. 28

Pages: 5208-5222

ISSN: 0892-6638

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 35 Citations

Scopus - 35 Citations

Other information

Authenticus ID: P-00A-1QR

DOI: 10.1096/fj.14-257923

Abstract (EN): Polymorphisms of the P2X7 receptor have been associated with increased risk of fractures in postmenopausal women. Although both osteoblasts and osteoclasts express P2X7 receptors, their function in osteogenesis remains controversial. Here, we investigated the role of the P2X7 receptor on osteogenic differentiation and mineralization of bone marrow mesenchymal stem cell (BMSC) cultures from post-menopausal women (age 71 +/- 3 yr, n = 18). We focused on the mechanisms related to intracellular [Ca2+](i) oscillations and plasma membrane-dynamics. ATP, and the P2X7 agonist BzATP (100 mu M), increased [Ca2+](i) in parallel to the formation of membrane pores permeable to TO-PRO-3 dye uptake. ATP and BzATP elicited reversible membrane blebs (zeiosis) in 38 +/- 1 and 70 +/- 1% of the cells, respectively. P2X7-induced zeiosis was Ca2+ independent, but involved phospholipase C, protein kinase C, and Rho-kinase activation. BzATP (100 mu M) progressively increased the expression of Runx-2 and Osterix transcription factors by 452 and 226% (at d 21), respectively, alkaline phosphatase activity by 88% (at d 28), and mineralization by 329% (at d 43) of BMSC cultures in a Rho-kinase-dependent manner. In summary, reversible plasma membrane zeiosis involving cytoskeleton rearrangements due to activation of the P2X7-Rho-kinase axis promotes osteogenic differentiation and mineralization of BMSCs, thus providing new therapeutic targets for postmenopausal bone loss.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15