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Effect of cell therapy with allogeneic osteoblasts on bone repair of rat calvaria defects.

Abstract：

BACKGROUND AIMS:Regenerative medicine strategies based on cell therapy are considered a promising approach to repair bone defects. The aims of this study were to evaluate the effect of subculturing on the osteogenic potential of osteoblasts derived from newborn rat calvaria and the effect of these osteoblasts on bone repair of rat calvaria defects. METHODS:Cells were obtained from 50 newborn rat calvaria, and primary osteoblasts (OB) were compared with first passage (OB-P1) in terms of osteogenic potential by assaying cell proliferation, alkaline phosphatase (ALP) activity, extracellular matrix mineralization and gene expression of the osteoblastic markers RUNX2, ALP, osteocalcin and bone sialoprotein. Then, 5-mm calvaria defects were created in 24 Wistar rats, and after 2 weeks, they were locally injected with 50 µL of phosphate-buffered saline containing either 5 × 106 osteoblasts (OB-P1, n = 12) or no cells (control, n = 12). Four weeks post-injection, the bone formation was evaluated by micro-computed tomography and histological analyses. Data were compared by analysis of variance, followed by the Student-Newman-Keuls's test or Student's t-test (P ≤ 0.05). RESULTS:OB-P1 showed high proliferation and ALP activity, and despite the reduced gene expression of osteoblastic markers and extracellular matrix mineralization compared with OB, they displayed osteogenic potential, being a good choice for injection into calvaria defects. The micro-tomographic and histological data showed that defects treated with OB-P1 presented higher bone formation compared with control defects. DISCUSSION:Our results indicate that cells derived from newborn rat calvaria retain osteoblastic characteristics after subculturing and that these osteoblasts stimulate bone repair in a rat calvaria defect model.

journal_name

Cytotherapy

journal_title

Cytotherapy

authors

Souza ATP,Freitas GP,Lopes HB,Ferraz EP,Oliveira FS,Beloti MM,Rosa AL

doi

10.1016/j.jcyt.2018.06.010

subject

Has Abstract

pub_date

2018-10-01 00:00:00

pages

1267-1277

issue

10

eissn

1465-3249

issn

1477-2566

pii

S1465-3249(18)30552-8

journal_volume

20

pub_type

杂志文章

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