4.6 Article

Transplantation of autologous endothelial progenitor cells in porous PLGA scaffolds create a microenvironment for the regeneration of hyaline cartilage in rabbits

期刊

OSTEOARTHRITIS AND CARTILAGE
卷 21, 期 10, 页码 1613-1622

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.joca.2013.07.016

关键词

Animal model; Cartilage tissue engineering; Endothelial progenitor cells; Extracellular matrix; Regenerative medicine; Scaffold

资金

  1. National Science Council of Taiwan, R.O.C [100-2627-B006-009-, 100-2627-B006-018-, 101-2221-E-006-062-MY3]
  2. Multidisciplinary Center of Excellence for Clinical Trial and Research of the Department of Health, Executive Yuan, Taiwan [DOH 101-TD-B-111-102]

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Objective: Repairing articular cartilage is clinically challenging. We investigated a simple, effective and clinically feasible cell-based therapeutic approach using a poly(lactide-co-glycolide) (PLGA) scaffold seeded with autologous endothelial progenitor cells (EPC) to repair a full-thickness osteochondral defect in rabbits using a one-step surgery. Methods: EPC obtained by purifying a small amount of peripheral blood from rabbits were seeded into a highly porous, biocompatible PLGA scaffold, namely, EPC-PLGA, and implanted into the osteochondral defect in the medial femoral condyle. Twenty two rabbits were randomized into one of three groups: the empty defect group (ED), the PLGA-only group or the EPC-PLGA group. The defect sites were evaluated 4 and 12 weeks after implantation. Results: At the end of testing, only the EPC-PLGA group showed the development of new cartilage tissue with a smooth, transparent and integrated articular surface. Moreover, histological analysis showed obvious differences in cartilage regeneration. At week 4, the EPC-PLGA group showed considerably higher TGF-beta 2 and TGF-beta 3 expression, a greater amount of synthesized glycosaminoglycan (GAG) content, and a higher degree of osteochondral angiogenesis in repaired tissues. At week 12, the EPC-PLGA group showed enhanced hyaline cartilage regeneration with a normal columnar chondrocyte arrangement, higher SOX9 expression, and greater GAG and collagen type II (COLII) content. Moreover, the EPC-PLGA group showed organized osteochondral integration, the formation of vessel-rich tubercular bone and significantly higher bone volume per tissue volume and trabecular thickness (Tb.Th). Conclusion: The present EPC-PLGA cell delivery system generates a suitable in situ microenvironment for osteochondral regeneration without the supplement of exogenous growth factors. (C) 2013 Osteoarthritis Research Society International. Published by Elsevier Ltd. All rights reserved.

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