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端粒和端粒酶与永生化软骨细胞 总被引:4,自引:0,他引:4
关节软骨细胞凋亡与增殖在正常情况下处于动态平衡,维持着关节软骨的细胞数量及其形态和功能的稳定.软骨细胞凋亡过盛可能是关节软骨退变发展成骨关节炎的重要原因之一.关节软骨细胞凋亡主要与细胞的端粒长短和端粒酶活性密切相关,细胞的"末端复制问题"使端粒不可避免地随着复制逐渐缩短,端粒缩短达到临界长度时细胞将无法进行分裂而凋亡.端粒酶的逆转录反应弥补细胞分裂过程的端粒丢失,实现细胞永生化.有效地调控软骨细胞端粒长短、端粒酶的活性,抑制关节软骨细胞过度凋亡,意味着部分软骨细胞功能得以保护,延缓或减轻关节软骨的退变,促进软骨修复,从而缓解症状,改善关节功能,可能为骨关节炎的防治开辟一条新途径. 相似文献
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培养软骨、关节软骨、生长板和半月板的超微结构研究 总被引:1,自引:1,他引:0
目的 探讨离心管培养软骨作为移植材料的可能性。方法 3周龄兔关节软骨细胞经离心管培养2周形成软骨,另取6周龄兔肱骨头关节软骨、肱骨近端生长板和半月板,并对4种软骨进行透射电镜观察,比较其软骨细胞和细胞外基质结构。结果 离心管培养软骨具有独特的超微结构,与关节软骨和生长板有一定的相似性,而与半月板有明显区别。4种软骨都形成了各自不同的细胞和细胞外基质特征,离心管培养软骨呈现典型软骨细胞凋亡,生长板表现“黑暗”软骨细胞,关节软骨和半月板未见细胞凋亡。结论 离心管培养软骨具有独特的超微结构,可作为关节软骨和生长板的移植物。 相似文献
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关节内骨折后受损软骨细胞凋亡的实验研究 总被引:3,自引:1,他引:2
目的:探讨关节内骨折后受损软骨的变化。方法:利用冲击在兔膝关节内造成骨折,利用TUNEL、流式细胞计数,透射电镜、DAPI染色等方法对受损软骨进行动态观察。结果:关节内骨折后2周,受损软骨细胞发生坏死及凋亡。1月后受损软骨细胞仍进行性凋亡。3-6月后,损伤软骨周围的细胞也发生凋亡,损伤部软骨细胞增生,其中部分增生细胞凋亡。结论:关节内骨折后软骨细胞进行性凋亡,可能是创伤后骨关节炎发生的原因之一。 相似文献
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Improved sexual behavior in male rats treated with a Chinese herbal extract: hormonal and neuronal implications 总被引:3,自引:0,他引:3
Zanoli P Benelli A Zavatti M Rivasi M Baraldi C Baraldi M 《Asian journal of andrology》2008,10(6):937-945
Aim: To investigate the influence of an extract obtained from five Chinese medicinal plants on sexual behavior of adult male rats. Methods: The extract was administered at doses of 30, 60 and 120 mg/kg by oral gavage, acutely (one time, 45 min before mating test) or subchronically (daily for 10 days) in sexually potent and sexually sluggish/impotent rats. Sexual behavior, serum levels of luteinizing hormone (LH) and testosterone (T) were evaluated in treated rats and compared with controls receiving vehicle. The effect of the extract on central dopaminergic neurotransmission was assessed in the nucleus accumbens using a microdialysis technique. Results: In sexually potent rats, both acute and subchronic treatment with the extract dosed at 30 and 60 mg/kg reduced mount latency and intromission latency. In sluggish/impotent rats, the acutely administered extract at the dose of 60 mg/kg shortened ejaculation latency, whereas subchronically administered at the doses of 30 and 60 mg/kg, reduced mount, intromission and ejaculation latencies, increasing also the percentage of mounting and ejaculating rats. The extract dosed at 60 mg/kg significantly increased LH and T following acute and subchronic administration and increased 3,4-dihydroxyphenylacetic acid levels in the nucleus accumbens, 30 min after the acute administration. Conclusion: The improvement in both appetitive and consummatory components of sexual behavior observed in male rats treated with the extract could be ascribed to increased serum T level in parallel with the activation of the central dopaminergic system. 相似文献
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微创经皮钢板内固定治疗胫骨骨折 总被引:5,自引:4,他引:1
2005年3月~2008年3月,我科采用微创经皮钢板内固定治疗胫骨骨折34例,疗效满意。1材料与方法1.1病例资料本组34例,男20例,女14例,年龄12~68岁。致伤原因:交通事故24例,坠落伤4例,砸伤6例,均为闭合性损伤。合并多发骨折8例,颅脑、胸腹损伤6例。其中胫骨近端损伤7例,胫骨干损伤17例,胫骨远端损伤10例,合并腓骨骨折28例,合并下胫腓联合分离3例。 相似文献
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