Limitations and challenges in MSC delivery for bone regeneration

Xiao, Yin (2009) Limitations and challenges in MSC delivery for bone regeneration. In Proceedings of 2nd Meeting of IADR Pan Asian Pacific Federation (PAPF) and the 1st Meeting of IADR Asia/Pacific Region (APR), Shangri-La Hotel, Wuhan, China.

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Objective: Regeneration of osseous defects by tissue-engineering or cell delivery approach provides a novel means of treatment utilizing cell biology, materials sciences, and molecular biology. The concept of in vitro explanted mesenchymal stem cells (MSCs) with an ability to induce new bone formation has been demonstrated in some small animal models. However, contradictory results have been reported regarding the regenerative capacity of MSCs after ex vivo expansion due to the lack of the understanding of microenvironment for MSC differentiation in vivo. ----- -----

Methods: In our laboratory tissue-derived and bone marrow-derived MSCs have been investigated in their osteogenesis. Cell morphology and proliferation were studied by microscopy, confocal microscopy, FACS and cell counting. Cell differentiation and matrix formation were analysed by matrix staining, quantitative PCR, and immunohistochemistry. A SCID skull defect model was used for cell transplantation studies.----- -----

Results: It was noted that tissue-derived and bone marrow-derived MSCs showed similar characteristics in cell surface marker expression, mesenchymal lineage differentiation potential, and cell population doubling. MSCs from both sources could initiate new bone formation in bone defects after delivery into a critical size defects. The bone forming cells were from both transplanted cells and endogenous cells from the host. Interestingly, the majority of in vitro osteogenic differentiated cells did not form new bone directly even though mineralized matrix was synthesized in vitro by MSCs. Furthermore, no new bone formation was detected when MSCs were transplanted subcutaneously.----- -----

Conclusion: This study unveiled the limitations of MSC delivery in bone regeneration and proposed that in vivo microenvironment needs to be optimized for MSC delivery in osteogenesis.

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ID Code: 41226
Item Type: Conference Paper
Refereed: Yes
Keywords: osteogenesis, Cell morphology, bone formation, bone regeneration
Subjects: Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > BIOCHEMISTRY AND CELL BIOLOGY (060100)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2009 [please consult the author]
Deposited On: 12 Apr 2011 22:25
Last Modified: 16 Apr 2011 20:18

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