食管粘膜内微量元素含量与p53、PCNA表达的关系

背景与目的:食管癌高发区食管癌患者的头发、血清内Zn、Cu等微量元素有异常改变,但在不同病变食管粘膜内的含量有无变化、与p53和增殖细胞核抗原(proliferatingcellnuclearantigen,PCNA)的表达有何关系尚不清楚,本文就食管粘膜内微量元素含量、p53突变及PCNA表达与食管病变的关系作一探讨。方法:151例食管活检标本分为正常、慢性炎、非典型增生与早期癌四种类型,以X-射线能谱仪进行微量元素定量检测,以S-P免疫组化法检测PCNA表达及p53突变状态。结果:正常上皮、慢性炎、非典型增生及早期癌中Zn、Se、Mo的含量分别为1.74±0.32、1.53±0.64、0.58±0.21、0.20±0.08;0.15±0.06、0.10±0.03、0.04±0.02、0;4.73±1.31、3.45±1.19、3.51±1.32、2.51±1.04,不同组织学类型间差异显著(P<0.05)。Cu/Zn、Ni含量分别为0.57±0.17、0.89±0.18、2.45±0.48、2.92±1.08;0.45±0.05、1.27±0.11、2.46±0.24、2.58±0.33,随着食管病变程度的升级含量渐增,差异显著(P<0.05)。p53、PCNA阳性表达在正常上皮与非典型增生及早期癌组内分别为0、46.15%、100%;31.19%、84.62%、100%,差异显著(P<0.01),且与微量元素含量显著相关。结论:Zn、Se、Mo、Cu、Ni含量变化可能对食管癌高发区人食管上皮p53突变与PCNA过表达具有

Association of p53, PCNA expression and trace element content in esophageal mucosa

BACKGROUND & OBJECTIVE: There were abnormal changes of trace element in esophageal cancer patient's hair and serum in the high risk area. But it was still unknown that the relationship between p53 and proliferating cell nuclear antigen(PCNA) expression and the trace element content in varied esophageal mucosa. This study was designed to probe the relationship of trace element content and p53 mutation, PCNA expression in esophgeal mucosa. METHODS: Esophageal biopsy specimen of 151 cases were divided into four groups (normal, esophagitis, dysplasia, and early carcinoma). The quantitative determination of trace element was performed was performed by using X-ray energy spectrometry and the detection of PCNA expression and p53 mutation was performed by using S-P immunohistochemistry method. RESULTS: The contents of Zn, Se, Mo, were 1.74 +/- 0.32, 1.53 +/- 0.64, 0.58 +/- 0.21, 0.20 +/- 0.08; 0.15 +/- 0.06, 0.10 +/- 0.03, 0.04 +/- 0.02, 0; 4.73 +/- 1.31, 3.45 +/- 1.19, 3.51 +/- 1.32, 2.51 +/- 1.04; respectively in four groups. There was a significant difference in varied histological typies(P < 0.05). The contents of Cu/Zn, Ni were 0.57 +/- 0.17, 0.89 +/- 0.18, 2.45 +/- 0.48, 2.92 +/- 1.08; 0.45 +/- 0.05, 1.27 +/- 0.11, 2.46 +/- 0.24, 2.58 +/- 0.33; respectively, which increased gradually in pace with upgrade of esophageal lesions, with significant difference (P < 0.05). The postive rates of p53 and PCNA were 0, 46.15%, 100%; 31.19%, 84.62%, 100% respectively in normal esophageal epithelium, dysplasia, and early carcinoma, with significant difference (P < 0.01), and had significant correlation to trace element. CONCLUSION: The content variation of Zn, Se, Mo, Cu, Ni could be possessed of certain effect on p53 mutation and PCNA overexpression of esophageal epithelium in the high risk area.