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3 result(s) for "细胞周期依赖性"
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外源性p27~(Kip1)对兔眼滤过术后结膜瘢痕的抑制作用
目的观察外源性p27Kip1作用于兔眼滤过术后的效果,研究其对术后结膜瘢痕形成的抑制作用。方法根据GenBank人p27基因序列设计引物,制备腺病毒介导Ad-p27并验证其正确性。兔眼滤过术中结膜下注射Ad-p27、丝裂霉素C(MMC)和PBS,术后28d内测定眼压、观察眼前节的动态变化及并发症,依照Krofeld评分法进行滤过泡评分。结果 Ad-p27作用后28d内维持低眼压的状态,术后3d眼压下降达峰值7.68mmHg。Ad-p27降眼压程度与MMC相似,与PBS比较术后7d(P<0.05)、14d(P<0.01)、21d(P<0.01)和28d(P<0.05)眼压存在显著性差异。Ad-p27作用后14d内滤过泡弥漫性隆起,28d有囊性泡形成。Ad-p27组与PBS组比较,滤过泡评分在7d(P<0.01)、14d(P<0.01)和21d(P<0.05)有显著性差异。Ad-p27组术后21d前房恢复正常,而PBS组术后14d恢复正常。Ad-p27作用偶有前房渗出、前房出血等并发症。结论 Ad-p27通过抑制手术区瘢痕形成保持滤过道通畅,降低眼压。
miRNAs在肺癌中的作用
"这些miRNAs在血清中的高表达是非小细胞肺癌的血液生物标记物……" 肺癌居全球癌症死亡原因的首位,但迄今尚无有效针对这一致命疾患的诊断和预测性生物标记物。新证据表明,miRNAs具有以细胞周期依赖性方式调节转录及翻译的潜能,这为我们在分子水平深入理解癌症开拓了新视野。
子宫内膜腺癌中p53和CDK4的表达及意义
目的 探讨子宫内膜腺癌中调亡相关基因p53和细胞周期素依赖性激酶4(cyclin dependent kinase4,CDK4)的表达水平及临床意义。方法 采用免疫组化SP法检测32例子宫内膜腺癌中p53和CDK4的表达。结果 32例子宫内膜腺癌中p53蛋白表达阳性率为43.8%,p53阳性表达与子宫内膜腺癌的组织学分级,肌层浸润深度和淋巴结转移呈负相关(P<0.05),与临床分期无相关关系(P>0.05);CDK4在子宫内膜腺癌中的阳性表达率为68.8%(22/32),CDK4阳性表达与子宫内膜腺癌的浸润深度和淋巴结转移呈正相关(P>0.05),与组织学分级和临床分期均无关(P>0.05),p53和CDK4的表达呈负相关(P<0.05)。结论 p53和CDK4作为细胞周期调控因子可能参与了子宫内膜腺癌的发生发展。