Journal
BIOMATERIALS
Volume 32, Issue 29, Pages 7060-7067Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2011.06.008
Keywords
Decellularization; Extracellular matrix; Bone marrow; Scaffold; Hematopoiesis
Funding
- Ministry of Health, Labor and Welfare
- Japan Science and Technology Agency (JST-CREST)
- Japan Society for the Promotion of Science (JSPS)
- Grants-in-Aid for Scientific Research [20680027, 09J04930] Funding Source: KAKEN
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Decellularized bone/bone marrow was prepared to provide a microenvironment mimicking that of the bone marrow for three-dimensional culture in vitro. Bone/bone marrows were hydrostatically pressed at 980 MPa at 30 degrees C for 10 min to dismantle the cells. Then, they were washed with EGM-2 and further treated in an 80% EtOH to remove the cell debris and lipid, respectively. After being rinsed and shaken with PBS again, treated bone/bone marrows were stained with hematoxylin and eosin (H-E) to assess the efficacy of decellularization. Cells were determined to have been completely removed through H-E staining of their sections and DNA quantification. Rat mesenchymal stem cells (rMSCs) were seeded on the decellularized bone/bone marrows and cultured for 21 days. The adhesion of rMSCs on or into decellularized bone/bone marrows was confirmed and proliferated over time in culture. The osteogenic differentiation effect of decellularized bone/bone marrows on rMSCs in the presence or absence of dexamethasone was investigated. Decellularized bone/bone marrows without dexamethasone significantly increased alkaline phosphatase (ALP) activity, indicating promoted osteogenic differentiation of rMSCs. In an animal study, when decellularized bone/bone marrows were implanted into the rat subcutaneous, no immune reaction occurred and clusters of the hematopoietic cells could be observed, suggesting the decellularized bone/bone marrows can provide a microenvironment in vivo. (C) 2011 Elsevier Ltd. All rights reserved.
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