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find Author "苏显林" 2 results
  • EXPERIMENTAL STUDY ON OSTEOGENESIS OF SYNOVIUM-DERIVED MESENCHYMAL STEM CELLS IN VITRO AND IN VIVO

    ObjectiveTo investigate the osteogenic differentiation potential and the biological features of synovium-derived mesenchymal stem cells (SMSCs) in vitro and to observe the osteogenic capability of the composite scaffolds constructed with SMSCs and hydroxylapatite/chitosan/poly L-latic acid (HA/CS/PLLA) in vivo. MethodSMSCs were separated and cultured with adherent method and enzymatic digestion method. Specific phenotypes of SMSCs were detected by flow cytometry after purification. Then, SMSCs were identified by oil red O staining, alkaline phosphatase (ALP) staining, and alizarin red staining after adipogenic and osteogenic induction, respectively. In vitro experiments:the expressions of osteogenic related genes[osteocalcin (OCN), collagen type I, ALP, and Runx-2] were detected by real-time fluorescent quantitative PCR at 1, 7, 14, 21, and 28 days after osteogenic induction; ALP activities were also determined by ELISA at 1, 3, 5, 7, 9, and 11 days after osteogenic induction; meanwhile, extracellular matrix calcium mineralization was detected by alizarin red S method at 7, 14, 21, and 28 days after osteogenic induction; the normal SMSCs were harvested as control group. In vivo experiments:Twenty-four Sprague Dawley (SD) rats were randomly divided into experimental group (n=12) and control group (n=12) . The 3rd passage SMSCs were seeded on HA/CS/PLLA to construct composite scaffolds, after adhesion for 72 hours in vitro, the composite scaffolds were implanted into the right thigh muscle of 12 SD rats as experimental group; HA/CS/PLLA was implanted into the right thigh muscle of the other 12 SD rats as control group. At 4 and 8 weeks after implantation, the scaffolds were harvested for X-ray film and histological examination to observe ectopic bone formation. ResultsThe positive rates of CD147, CD90, CD105, and CD44 were more than 95%, while the positive rates of CD117, CD34, CD14, and CD45 were less than 10%. Oil red O staining demonstrated red lipid droplets in the cytoplasm, and alizarin red staining showed flaky red calcifications, and cytoplasm was dyed brown by the ALP staining. The mRNA expressions of collagen type I, ALP, and Runx-2 were significantly increased at 7 days after osteogenic induction, and OCN mRNA expression was significantly increased at 14 days after osteogenic induction; ALP activity was significantly higher at 5, 7, 9, 11 days after osteogenic induction in the SMSC-induced group than control group and reached a maximum at 7 days (P<0.05) . Calcium mineralization was significantly enhanced at 14 days after osteogenic induction, and gradually increased with time (P<0.05) ; moreover, it was significantly higher in the SMSC-induced group than control group (P<0.05) . X-ray and histological examination demonstrated that the new bone tissues formed in 2 groups, but bone formation content of the experimental group was significantly more than that of the control group at 4 and 8 weeks after implantation (P<0.05) . ConclusionsSMSCs can be induced into osteoblasts both in vitro and in vivo, so SMSCs might be a promising seed cells for bone tissue engineering.

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  • 侧颌颈皮瓣修复颧颞部恶性肿瘤术后软组织缺损

    目的总结应用侧颌颈皮瓣修复颧颞部恶性肿瘤切除术后软组织缺损的效果。 方法2010年10月-2014年2月,应用同侧侧颌颈皮瓣修复颧颞部皮肤癌术后软组织缺损5例。男2例,女3例;年龄50~ 74岁,平均65岁;病程3个月~5年,平均约18个月。肿瘤类型:基底细胞癌2例,鳞癌3例。瘤体位于颧颞相连部位,大小约3.5 cm×2.0 cm~7.0 cm×5.0 cm。病灶切除后皮肤软组织缺损范围为5.0 cm×3.5 cm~8.5 cm×6.0 cm。术中切取皮瓣范围8.5 cm×4.0 cm~12.0 cm×5.0 cm,蒂宽2.5~3.0 cm,长2.0~4.0 cm。 结果术后皮瓣全部成活,供区切口均I期愈合。5例均获随访,随访时间6个月~2年,平均14.5个月。皮瓣色泽与受区皮肤相近;2例因蒂部稍宽,皮瓣蒂端转角有“猫耳朵”凸现,但颜面部外观整体满意。移位皮瓣耐受性好,皮瓣成活、软组织缺损创面完全修复后进一步放疗,放疗后皮瓣无溃疡、坏死。随访期间肿瘤无复发。 结论侧颌颈皮瓣修复颧颞部恶性肿瘤切除后软组织缺损符合整形修复原则,且能耐受进一步放疗,是一种简便、安全、有效的治疗方法。

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