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2 结果
2.1 凝胶电泳
共得到3个对照组共12份的总蛋白质考染图谱各4张。经PDquest软件分析及人工匹配,每张蛋白数在230个左右。经PDquest软件处理后,共发现差异蛋白质点19个(表达差异2倍以上),差异点范围集中在pI4-pI7和66 kDa-10 kDa之间。图1是肺腺癌培养液上清蛋白(图1A)及配对肺组织培养液上清蛋白(图1B)双向凝胶电泳考染图谱。图2是差异蛋白第6号点在双向电泳时的差异情况。
2.2 差异蛋白质点的生物信息学鉴定
19个差异性蛋白质点经质谱仪分析和数据库搜索,共鉴定14个(表2)。包括:α-烯醇酶(non-neural enolase, NNE)、磷酸丙糖异构酶(triosephosphate isomerase, Tim)、核苷二磷酸激酶A(nucleotide diphosphate kinase A, NDPK A)、儿茶酚O-甲基转移酶2(catechol O-methyltransferase 2, COMT 2);膜联蛋白A1(Annexin A1, ANXA1)、膜联蛋白A2(Annexin A2, ANXA2)、膜联蛋白A4(Annexin A4, ANXA4)、凝集素-3(Galectin 3)、半胱天冬酶凋亡前衔接蛋白(proapoptotic caspase adapter protein, PACAP);铜锌超氧化物歧化酶(superoxide dismutase[Cu-Zn], SOD1)、谷胱甘肽-S-转移酶 P(glutathione S-transferase P, GSTP1);转甲状腺素蛋白(transthyretin, TTR)、乙基丙二酸脑病蛋白1(ethylmalonic encephalopathy protein1, ETHE1),PDZ和LIM结构域蛋白1(PDZ and LIM domain protein 1, PDLIM1)。有5个未能通过生物信息学方法鉴定。图3是Xca凝胶图中6号蛋白质点的PMF及Mascot搜索结果。
2.3 Western blot检测
第6号蛋白质点是双向电泳中发现的表达差异比较明显的蛋白质,经鉴定是PACAP,已有的研究发现PACAP有一定的组织特异性,在脑组织中高表达,未见其在肿瘤患者血清中的研究。我们选取它作为进一步研究的对象,检测了4组培养液上清及6组血清标本中PACAP的表达情况。结果见图4、图5。结果显示PACAP在肺腺癌患者血清中的表达水平是它在健康人血清中的2.51倍-5.81倍,平均(3.56±1.16)倍。
2.4 PACAP ELISA检测
肺腺癌血清PACPA的OD值是0.188±0.033,较肺小细胞癌(OD值为0.151±0.017)(P=0.002)、肺良性病变(OD值为0.154±0.023)(P<0.001)和健康人(OD值为0.147±0.020)(P<0.001)均高,差异具有统计学意义。肺腺癌和肺鳞癌之间OD值差别不明显(P=0.704)。肺小细胞癌和肺良性肿瘤(P=0.939)以及健康人(P=0.346)之间OD值差别不明显(表3)。
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