Osteogenesis in human periodontal ligament stem cell sheets is enhanced by the protease-activated receptor 1 (PAR(1)) in vivo

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Alves, Tomaz ; Gasparoni, Leticia M. ; Balzarini, Danilo ; Albuquerque-Souza, Emmanuel ; de Oliveira, Victhor ; Rovai, Emanuel S. ; da Silva, Jose ; Huaman-Mendoza, Aldrin ; Catalani, Luiz H. ; Sipert, Carla R. ; Holzhausen, Marinella

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 12, n. 1, p. 11-pg., 2022-09-18.

Abstract

Human periodontal ligament stem cells (PDLSCs) have been studied as a promising strategy in regenerative approaches. The protease-activated receptor 1 (PAR(1)) plays a key role in osteogenesis and has been shown to induce osteogenesis and increase bone formation in PDLSCs. However, little is known about its effects when activated in PDLSCs as a cell sheet construct and how it would impact bone formation as a graft in vivo. Here, PDLSCs were obtained from 3 patients. Groups were divided into control, osteogenic medium and osteogenic medium + PAR(1) activation by TFLLR-NH2 peptide. Cell phenotype was determined by flow cytometry and immunofluorescence. Calcium deposition was quantified by Alizarin Red Staining. Cell sheet microstructure was analyzed through light, scanning electron microscopy and histology and transplanted to Balb/c nude mice. Immunohistochemistry for bone sialoprotein (BSP), integrin beta 1 and collagen type 1 and histological stains (H&E, Van Giesson, Masson's Trichrome and Von Kossa) were performed on the ex-vivo mineralized tissue after 60 days of implantation in vivo. Ectopic bone formation was evaluated through micro-CT. PAR(1) activation increased calcium deposition in vitro as well as BSP, collagen type 1 and integrin beta 1 protein expression and higher ectopic bone formation (micro-CT) in vivo. (AU)

• FAPESP's process: 18/13818-5 - Effect of protease-activated receptor type 1 (PAR1) activation on the osteogenic activity in human periodontal ligament stem cells membranes: an in vivo study
• Grantee: Tomaz Alves da Silva Neto
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 17/23158-0 - EFFECT OF PROTEASE ACTIVATED RECEPTOR 1 (PAR1) ACTIVATION ON THE OSTEOGENIC ACTIVITY OF MEMBRANES OF HUMAN PERIODONTAL LIGAMENT MESENCHYMAL STEM CELLS
• Grantee: Marinella Holzhausen Caldeira
• Support Opportunities: Regular Research Grants