Hyaluronic acid protects tissue engineering cartilage from the inhibitory effect of nitroprusside sodium / 中华风湿病学杂志

ABSTRACT

Objective To investigate the protective mechanism of hyaluronic acid (HA) antagonistic to nitmprusside sodium (SNP) on the tissue engineering cartilage. Methods Alginate culture for two weeks was used to recover phenotype of dedifferentiated chondrocytes. Differentiation state of chondrecytes was analyzed by immunostaining. The growth of alginate-recovered chondrocytes on the chitosan-based scaffold was observed by scanning electron microscope. After cultured for 3 weeks, this tissue engineering cartilage was treated with SNP in the absence or presence of HA combined with specific β1 integrin blocking antibody collagen type Ⅱ and aggreean were detected by RT-PCR and Western blot. Results Collagen type Ⅱ expression in dedifferentiated chondrocytes was significantly enhanced by alginate bead culture. The chitosan-based scaffold supported cell adhesion, proliferation and migration. A dose-dependent inhibitory effect on the expression of collagen type Ⅱ and aggrecan was observed when tissue engineering cartilage was treated with SNP alone. HA significantly promoted collagen type Ⅱ, and aggrecan expression antagonistic to low concentrations of SNP (p<0.05). However, the specific β1,integrin blocking antibody abrogated the effects of HA. Conclusion Alginate culture recovers the phenotype of dedifferentiated chondrocytes. HA abrogats the inhibitory effect of SNP via β1 integrin signal pathway to protect tissue engineering cartilage.