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The role of the PCM in reducing oxidative stress induced by radical initiated photoencapsulation of chondrocytes in poly(ethylene glycol) hydrogels.

Abstract：

OBJECTIVE:The objectives for this study were to determine whether radical initiated photopolymerizations typically employed for cell encapsulations lead to oxidative stress incurred by chondrocytes and whether the development of a pericellular matrix (PCM) decreases this oxidative stress and has longer-term benefits on chondrocyte function. METHODS:Freshly isolated bovine chondrocytes were encapsulated in poly(ethylene glycol) (PEG) hydrogels devoid of a PCM or with a PCM, confirmed by immunocytochemistry (IC), and cultured for up to 2 weeks. Reactive oxygen species (ROS) production and damage to cell membrane by lipid peroxidation were accomplished using carboxy-2,7-difluorodihydrofluorescein diacetate (carboxy-H(2)DFFDA) and by malondialdehyde (MDA) content, respectively. Gene expression and proteoglycan synthesis were analyzed using reverse transcription (RT)-quantitative PCR (qPCR) and (35)SO(4) incorporation, respectively. RESULTS:The photopolymerization reaction, which alone generates radicals and extracellular ROS, led to oxidative stress in chondrocytes evidenced by increased intracellular ROS and lipid peroxidation. The presence of a PCM decreased intracellular ROS and abrogated membrane lipid peroxidation, improved aggrecan, collagen II and collagen VI expression, and enhanced proteoglycan synthesis. CONCLUSIONS:The development of the PCM prior to photoencapsulation in PEG hydrogels reduces oxidative stress and improves chondrocyte anabolic activity. Our data suggest this reduction occurs by decreased ROS diffusion into the cell and decreased membrane damage. Our findings suggest that minimizing oxidative stress, such as through the presence of a PCM, may have long-term beneficial effects on tissue elaboration when employing photopolymerizations to encapsulate chondrocytes for cartilage tissue engineering applications.

journal_name

Osteoarthritis Cartilage

journal_title

Osteoarthritis and cartilage

authors

Farnsworth N,Bensard C,Bryant SJ

doi

10.1016/j.joca.2012.06.015

subject

Has Abstract

pub_date

2012-11-01 00:00:00

pages

1326-35

issue

11

eissn

1063-4584

issn

1522-9653

pii

S1063-4584(12)00870-9

journal_volume

20

pub_type

杂志文章

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