胃癌患者血清可溶性细胞间粘附分子-1检测的临床意义
中国肿瘤临床 2000年第2期第27卷 论著
作者:陈斌 佘熙滇 刘永忠 王亚兵
单位:陈斌(皖南医学院附属弋矶山医院 安徽省芜湖市241001);佘熙滇(皖南医学院附属弋矶山医院 安徽省芜湖市241001);刘永忠(皖南医学院附属弋矶山医院 安徽省芜湖市241001);王亚兵(皖南医学院附属弋矶山医院 安徽省芜湖市241001)
关键词:胃癌;细胞间粘附分子-1;酶联免疫吸附试验
摘要 目的:探讨血清可溶性细胞间粘附分子-1(sICAM-1)水平与胃癌临床病理指标的关系,评价检测胃癌患者sICAM-1的临床意义。方法:应用酶联免疫吸附法分别检测34例治疗前胃癌患者及20例正常人血清中可溶性细胞间粘附分子-1的含量。结果:胃癌组及正常人对照组血清sICAM-1含量分别为367.7±104.7ng/ml,236.9±74.3ng/ml,两者有显著差异
Serum Levels of Intercellular Adhesion Molecule- 1 in Patients with Gastric Cancer
Chen Bin She Xidian Liu Yongzhong et al(Yijishan Hospital of Wannan Medical College, Wuhu)
Abstract Objective: To study the relationship between the serum soluble intercellular adhesion molecule- 1 (sICAM- 1) and the clinicopathological features, and to evaluate the possible prognostic significance of sICAM- 1 concentration in gastric cancers.Methods: Thirty- four patients with gastric cancer were prospectively evaluated. The control group consisted of 20 healthy volunteers. Serum concentrations of ICAM- 1 of them all were measured by the quantitative sandwich enzyme immunoassay technique. Results: The mean value of serum ICAM in patients with gastric cancer was 367.71+ 104. 7 ng/ml and that of the control group was 236.9+ 74.3 ng/ml, and the difference was significant (P< 0.001). The patients with the tumor size equal to or more than 5cm had significantly higher serum concentration of ICAM- 1 than those with smaller ones (406.7+ 90.2ng/ml vs 319.9 + 105.3 ng/ml) (P< 0.01). Compared the early stage (Ⅰ ~ Ⅱ ) patients with more advanced clinical stage patients (Ⅲ ~ Ⅳ ), the latter had a higher level of sICAM- 1 (397.1+ 102.4ng/ml vs 306.0 + 82.3ng/ml) (P< 0.05). There was also a statistically significant difference in sICAM- 1 levels between patients with positive lymph node status and those without (403.6+ 99.7ng/ml vs 302. 7+ 81.4ng/ml) (P< 0.01). No relation was observed between the level of sICAM- 1 and the grade of histological differentiation in patients with gastric cancer.Conclusion: Evaluation of sICAM-1 concentration may be a valuable parameter for predicting the prognosis and degree of cancer in gastric cancer patients.
Key Words Stomach neoplasm Intercellular adhasion molecule- 1 Enzyme- linked immunosorbent assay
细胞间粘附分子-1(ICAM-1)属免疫球蛋白超家族一成员,分子量为80~110KD的糖蛋白。该分子是白细胞整合素CD11a/CD18(LFA-1),CD11b/CD18(mac-1)的配体。ICAM-1可表达于多种细胞膜表面,在众多免疫反应中起着重要的作用,特别表现在抗原识别、呈递,淋巴细胞杀伤及聚集和靶向等方面[1]。ICAM-1尚可因缺少穿膜区和胞浆区片段,而以可溶性的形式存在于机体中。可溶性ICAM-1(sICAM-1)与膜型ICAM-1竞争性地结合LFA-1,因此,能够封闭免疫细胞表面的LFA-1,阻断免疫细胞对肿瘤细胞的有效识别和杀伤。这种现象可被认为是肿瘤逃逸监视的一重要机制[2,3]。国外学者已报道了某些肿瘤患者体液sICAM-1水平及其临床意义[4~7],国内相关研究却较少见。作者观察了胃癌患者血清sICAM-1含量,并分析了sICAM-1水平与胃癌组织病理特征的关系。
1 材料与方法
1.1 一般资料
34例经手术和病理诊断证实为胃癌患者作为研究对象,其中男24例,女10例;年龄35~74岁,平均54岁。临床Ⅰ~Ⅱ期11例,Ⅲ~Ⅳ期23例。抽取治疗前患者的空腹静脉血,离心取上清,置-30℃保存待测。
1.2 sICAM-1的检测
应用双抗体夹心酶联免疫吸附试验(ELISA)检测血清sICAM-1。试剂盒购自深圳晶美公司,方法严格按操作说明书进行。将待测血清稀释100倍,加入包被有ICAM-1单抗的微孔板中孵育,以保证标本sICAM-1得到结合,随后加入辣根过氧化物酶标记的抗ICAM-1单抗。反应板经洗涤并加入显色剂,在过氧化物酶的作用下呈现蓝色,用1mol/LH2SO4终止显色反应,反应液由蓝变黄,酶标仪450nm波长下比色,标本或参照标准进行复孔检测,每孔吸光度应控制在复孔均值()±15%·内。根据标准曲线,得出标本复孔吸光度均数所对应的sICAM-1的含量。
1.3 统计学分析
t检验组间差异,P<0.05有显著性差异。
2 结果
2.1 sICAM-1水平测定
胃癌患者的血清sICAM-1平均浓度为367.71±104.7ng/ml,正常对照组sICAM-1为236.9±74.3ng/ml,两组之间差异显著(P<0.001)。58%的胃癌患者血清sICAM-1的浓度超过正常对照上限(385.5ng/ml,+2s)。2.2血清sICAM-1水平与胃癌患者临床病理特征的关系结果见附表。肿瘤直径≥5cm的患者sICAM-1水平显著高于肿瘤直径<5cm的患者(P<0.05),临床期别Ⅲ~Ⅳ组的sICAM-1浓度显著高于临床期别Ⅰ~Ⅱ组(P<0.05)。淋巴结转移患者较未转移患者的sICAM-1浓度差异显著,前者高于后者。sICAM-1水平与胃癌组织分化程度无关。以正常对照组±2s为限计算各组阳性率。
附表 胃癌患者血清sICAM-1水平与临床病理特征关系
分组 |
例数 |
sICAM-1(±s,ng/ml) |
阳性率(例)% |
肿瘤直径 |
|
|
|
≥5cm |
19 |
406.7±90.2* |
(14/19)73.3 |
<5cm |
15 |
319.9±105.3 |
(6/15)40.0 |
淋巴结转移 |
|
|
|
阳性 |
21 |
403.6±99.7* |
(15/21)71.4 |
阴性 |
13 |
302.7±81.4 |
(5/13)38.5 |
分化程度 |
|
|
|
高、中分化 |
12 |
320.5±93.2 |
(4/12)33.3 |
低分化 |
22 |
393.9±103.1 |
(16/22)72.7 |
临床期别 |
|
|
|
Ⅰ~Ⅱ |
11 |
306.0±82.3 |
(4/11)36.4 |
Ⅲ~Ⅳ |
23 |
397.1±102.4** |
(16/23)69.6 |
*P<0.01,**P<0.05,与组内对照
3 讨论
研究表明,肿瘤细胞膜表达一定水平的ICAM-1,有利于免疫效应细胞识别和杀伤肿瘤细胞[8,9]。最近的研究表明,从肿瘤细胞以及其它细胞(特别是单个核细胞)上脱落产生的可溶性ICAM-1(sICAM-1),能有效地阻断细胞毒性T淋巴细胞(CTL)和NK细胞粘附、杀伤肿瘤细胞。Becker等人发现CTL介导的MHC-限制性的杀伤黑色素瘤细胞可被sICAM-1完全阻断,其阻断浓度为950ng/ml[3]。本研究发现,34例胃癌患者中的20例血清sICAM-1浓度均在正常对照组上限之上。sICAM-1水平的增高与某些肿瘤的不良预后有一定关系,sICAM-1呈高水平的黑色素瘤患者初次复发时间及生存期均较短[6]。为此,本研究还对sICAM-1水平与胃癌患者临床特征的关系做了初步的分析。肿瘤直径大于或等于5cm的胃癌患者,其血清中sICAM-1的水平较体积较小者高,提示,肿瘤负荷与sICAM-1水平相关。换言之,胃癌肿瘤细胞可能是sICAM-1的主要来源。这种推论在其它类型肿瘤中得到了体现,如肝癌患者经动脉导管灌注栓塞治疗后,其血清sICAM-1和AFP水平下降时序完全一致,因为AFP是由肝癌细胞产生并释放的,故可认为sICAM-1来源于肝癌细胞[7]。我们的研究结果同时表明,sICAM-1水平与临床分期及淋巴结转移相关,淋巴结转移和高临床期别患者具有较高的sICAM-1浓度。淋巴结状态,肿瘤大小及临床期别均是有意义的预后指标。因此,胃癌患者sICAM-1检测在临床上有一定价值。
(柏敏霜校对)
参考文献
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1999-06-12 收稿