全唾液中蛋白质含量检测及其等电聚焦、聚丙烯酰胺凝胶电泳分析

Whole salivary protein compositions in the patients with periodontitis or head and neck cancer

目的 :探讨唾液成分的变化 ,观察其与疾病发生、发展的关系。方法 :收集无口腔疾患的健康人 10 3例、牙周炎患者 2 6例、口腔颌面部恶性肿瘤患者 41例全唾液标本 ,采用Lowry法、等电聚焦 (IEF)和聚丙烯酰胺凝胶 (SDS PAGE)电泳方法进行分析。结果 :①正常人组、牙周炎和肿瘤组全唾液中蛋白质含量 (mg/ml)分别为 1.0 9± 0 .2 4、1.11± 0 .0 9和 1.0 5± 0 .0 5(P >0 .0 5) ,牙周炎组及肿瘤组与正常人组相差不显著。②肿瘤组蛋白质等电点区带较正常人组数量略有增加 ,但其区带的分布与正常人组未见明显差异 ;正常人组和牙周炎组蛋白质的等电点区带总数分别为 3 0条和 3 9条 ,其等电点区带与正常人在数量和区带分布上均不相同。当pH偏酸或偏碱的情况下 ,其数量均相应发生变化 ,其中 pH偏碱时表现更为显著 ,少量增加表现在 pH偏酸区域。③正常人与肿瘤全唾液的SDS PAGE样本区带数量分别为 6.4和6.2 4,其区别主要在于 50 0 0 0～ 52 0 0 0、770 0 0、3 80 0 0等不同相对分子质量区域以及 3 0 0 0 0以下相对分子质量附近区域可见新的区带分布。结论 :牙周炎状态以及肿瘤发生时 ,唾液蛋白质总含量虽变化不显著 ,但SDS PAGE、IEF图谱蛋白质区带的等电点及相对分子质量的分布区域发生改变 ,表明唾液分泌蛋白质?

To analyze the whole salivary protein composition in th e pateins with periodontitis or head and neck cancer. Methods: Whole salivary protein composition was measured by Lowry method, isoele ctric focusing (IEF) and sodium dodecyl sulphate polyacrylamide gel electrophare sis(SDS PAGE) in 26 cases of periodotitis, 41 of head and neck cancer and 103 o f health controls. Results: ①The amount of total protein in whole salivary in the three groups was not significantly different ( P >0 .05). ②There were 39 protein bands detected in the periodontitis group whereas only 30 in the control, the extra bands were at pH≤4 and pH>7;there were 32 b ands in tumor group. ③SDS PAGE showed that the number of protein bands with relative molecular mass of 77 000,50 000-52 000,38 000-30 000 increased in the tumour group. Conclusion: In the saliva of periodontitis indivauals there are more basic proteins,the relative molecular mass of the prot ein in the saliva of patients with tumor is different from that of health contro ls.