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BACKGROUND:Due to the complex physiological characteristics of the osteochondral tissue, the clinical repair of knee cartilage injury often has dissatisfied outcomes. Tissue engineering methods and tools provide a new idea for osteochondral repair. OBJECTIVE:To observe the effect of poly(hydroxybutyrate-co-hydroxyoctanoate/col agen) osteochondral tissue-engineered scaffold on the repair of articular cartilage injury in a rabbit. METHODS:The poly(hydroxybutyrate-co-hydroxyoctanoate/collagen) osteochondral tissue-engineered scaffold was prepared by solvent casting/particle leaching method. Then, seed cells were isolated and cultured on the scaffold. Twenty-four healthy New Zealand white rabbits, 4 weeks of age, were used for the study. Under balanced anesthesia, an articular cartilage defect (4.5 mm in diameter, 5 mm in depth) was created on the rabbit’s femoral condyle using a bone drill. After modeling, rabbits were randomized into three groups and given direct suture in blank group, pure scaffold implantation in control group and implantation of the scaffold-cell complex in experimental group. Femoral condyle of each rabbit was taken out for gross and histological observations at 8, 20 weeks after surgery. RESULTS AND CONCLUSION:At 8 weeks after surgery, transparent film-covered defects and small/irregular cells were found in the experimental group;the defects were filled with fibrous tissues in the control group;while there was no repair in the blank group. Until the 20th week, the defects were covered with hyaline cartilage-like tissues, accompanied by regular cell arrangement in the experimental group;in the control group, the defects were covered with white membranous tissues, and many chondrocytes were found at the basement and edge;in the blank group, some newborn tissues were visible at the defect region. These findings suggest that the poly (hydroxybutyrate-co-hydroxyoctanoate/collagen) osteochondral tissue-engineered scaffold carrying seed cells contributes to articular cartilage repair.
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OBJECTIVE@#To examine the expression and clinical significance of the Stat3 and Cyclin D1 in laryngeal squamous cell carcinoma (LSCC).@*METHOD@#The expression of Stat3 and Cyclin D1 in LSCC tissue were detected by the RT-PCR and Western blot method respectively, and then the relationship between Stat3 and Cyclin D1 protein expression level and relevant clinical factors of LSCC was explored.@*RESULT@#Compared to the normal larynx mucosa group, the expression level of Stat3 and Cyclin D1 was significantly higher in LSCC (P < 0.01). The high expression level of Stat3 and Cyclin D1 protein in LSCC was correlated with the clinical stage, tumor differentiation and lymph node metastases (P < 0.01). The expression level of Stat3 was positively correlated with that of Cyclin D1, The correlation coefficient(r) was 0.564 (P < 0.01) for the protein expression and 0.552 (P < 0.01) for the mRNA expression.@*CONCLUSION@#Stat3 signaling pathway may play an important role in the tumorigenesis and progression of LSCC. The expression level of Stat3 and its target gene Cyclin D1 can reflect the malignancy degree of LSCC.