放疗对人宫颈癌组织的增殖细胞核抗原(PCNA)和c-fos表达的影响

目的 探讨照射前、后人宫颈癌组织增殖细胞核抗原 (PCNA)和c fos表达的变化。方法 在多聚甲醛固定的活检癌组织冰冻切片上 ,进行PCNA和Fos的免疫组织化学染色。结果 放疗前的宫颈癌组织内 ,多数癌细胞呈PCNA免疫染色阳性 ;放疗后 ,多数癌细胞无PCNA染色 ,但间质细胞的PCNA免疫染色明显升高 ,大量间质细胞则呈中等或强阳性染色。放射治疗前的宫颈癌组织内 ,多数癌细胞呈Fos免疫染色阳性 ;放疗后的宫颈癌组织Fos免疫染色显著降低 ,多数癌细胞无Fos染色 ,但放疗前、后间质细胞的Fos免疫反应无明显变化。结论 照射抑制宫颈癌细胞的PCNA和c fos表达的同时 ,诱导间质细胞的PCNA表达。提示PCNA和c fos的表达状态可作为放射治疗中评价宫颈癌细胞增殖和间质组织修复的分子指标之一。

TGF-β1在宫颈鳞状细胞癌及其细胞外基质中的表达及其与PCNA的关系

目的:检测TGF-β1、PCNA在宫颈癌组织中表达,探讨TGF-β1、PCNA在宫颈癌发生发展中的作用及其相互关系。方法:采用免疫组化方法检测宫颈癌组织中TGF-β1、PCNA的表达。结果:TGF-β1在宫颈癌中的表达高、低分化组,中、低分化组之间具有统计学意义;TGF-β1在细胞外基质中的表达在宫颈癌各临床分期之间具有统计学意义;PCNA在宫颈癌高、中、低分化组中具有统计学意义。结论:瘤细胞内TGFβ1的减少和细胞外基质中TGFβ1分泌的增多具有协同作用,与肿瘤恶性转化、生长、侵袭、浸润转移有关;PCNA的表达是细胞增殖活性的指标。瘤细胞自身分泌TGFβ1反作用肿瘤,可提高PCNA增殖活性,旁分泌TGFβ1为PCNA阳性肿瘤提供了侵袭转移的微环境。

槲皮素对大鼠脑胶质瘤抑瘤作用的体内实验研究

目的观察槲皮素及顺铂对大鼠脑胶质瘤生长的抑制作用,初步探讨其作用机制。方法将30只颅内接种C6胶质瘤细胞的SD大鼠随机分为3组:分别给予顺铂、槲皮素及对照治疗7 d,观察各组肿瘤生长情况,于接种后17 d处死各组大鼠,收集肿瘤标本进行肿瘤大小、HE染色及电镜观察,并通过免疫组化检测肿瘤组织增殖细胞核抗原(proliferating cell nuclear antigen,PCNA)的表达。结果顺铂组[(66.2±5.9)mm3]、槲皮素组[(59.6±5.4)mm3]肿瘤体积低于对照组[(101.1±9.6)mm3]槲皮素组优于顺铂组(t=10.61,P<0.01),槲皮素组、顺铂组肿瘤抑制率分别为41.3%、34.8%。光镜观察槲皮素组、顺铂组肿瘤细胞密度降低,电镜显示有细胞凋亡。PCNA免疫组化结果显示槲皮素组(42.2%±5.1%)、顺铂组(50.0%±6.7%)肿瘤PCNA表达减少,与对照组(79.6%±8.6%)相比,具有统计学差异(F=416.12,P<0.01),两两比较,槲皮素组治疗效果优于顺铂组(q=55.25,P<0.01)。结论槲皮素和顺铂均可显著抑制大鼠颅内C6胶质瘤细胞生长,其机制可能与诱导肿瘤细胞凋亡和抑制肿瘤细胞增殖有关。

The arresting phase determines the total healing time of a locally irradiated skin wound in swine

Objective：Radiation is an important cause of delayed wound healing,and there still exist many questions regarding the patterns and mechanisms of wound healing.This study investigated the characteristics of wound healing after varying doses of local radiation and explored possible causes of the delay in healing caused by radiation.Methods：A full-thickness dorsal longitudinal skin tissue,2 cm in diameter,was excised after local irradiation on one side of the back of swine,and the other side was wounded as a control.The size of the wound area was recorded every two days after injury.Pathological changes,proliferating cell nuclear antigen（PCNA,immunohistochemistry）and apoptosis levels（TUNEL assay）were measured at different time points after wounding.Results：The course of wound healing can be divided into four phases,namely：the arresting phase,the healing priming phase,the fast healing phase,and the healed phase.Although the total wound healing time was closely correlated to the dose of irradiation（R2=0.9758）,it was more dependent on the length of the arresting phase（R2=0.9903）because once the arresting phase ended,the wound healed at a similar speed regardless of radiation doses.Pathological analysis showed that compared with the control side there were more necrotic tissues,slower epithelial crawling,as well as fewer blood vessels and cellular components in the irradiated side at the arresting phase,while other phases revealed no significant difference concerning these measurements.Immunohistochemistry showed that the irradiated wounds had significantly less PCNA-positive and more TUNEL-positive labeling of cells in the arresting phase than in other phases.Moreover,the changes were positively related to the radiation doses,but there was no obvious difference in cell proliferation or apoptosis among the healing priming phase,fast healing phase or healed phase,whether on the control side or on the irradiated side.Conclusions：After local irradiation,the length of the arresting phase determines the wound healing time.Increased apoptosis and decreased cell proliferation might be an important reason for the formation of the arresting phase.