The aggregation of pig articular chondrocyte and synthesis of extracellular matrix by a lactose-modified chitosan

被引:120
|
作者
Donati, I
Stredanska, S
Silvestrini, G
Vetere, A
Marcon, P
Marsich, E
Mozetic, P
Gamini, A
Paoletti, S
Vittur, F
机构
[1] Univ Trieste, Dipartimento Biochim Biofis & Chim Macromol, I-34127 Trieste, Italy
[2] Univ Roma La Sapienza, Policlin Umberto I, Dipartimento Med Sperimentale & Patol, I-00161 Rome, Italy
关键词
D O I
10.1016/j.biomaterials.2004.04.015
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
A reductive amination reaction (N-alkylation) obtained exploiting the aldheyde group of lactose and the amino group of the glucosamine residues of chitosan (d.a. 89%) afforded a highly soluble engineered polysaccharide (chitlac) for a potential application in the repair of the articular cartilage. Chitosan derivatives with 9% and 64% of side chain groups introduced have been prepared and characterized by means of potentiometric titration, H-1-NMR and intrinsic viscosity. Both polymers, with respect to the unmodified chitosan, induce cell aggregation when in contact with a primary culture of pig chondrocytes, leading to the formation of nodules of considerable dimensions (up to 0.5-1 mm in diameter). The nodules obtained from chondrocytes treated with chitlac with the higher degree of substitution have been studied by means of optical and electron microscopy (SEM, TEM) and the production of glycosaminoglycans (GAGs) and collagen has been measured by means of colorimetric assays. The chondro-specificity of GAG and collagen was determined by RT-PCR. The results show that the lactose-modified chitosan is non-toxic and stimulates the production of aggrecan and type II collagen. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:987 / 998
页数:12
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