100023 北京市2345信箱 世界华人消化杂志  2000年4月15日;8(4):400-402
Email: wcjd@public.bta.net.cn 世界华人消化杂志  ISSN 1009-3079  CN  14-1260/R
http:// www.wjgnet.com 版权归世界胃肠病学杂志社

研究原著

胃癌和癌前病变中树突状细胞的免疫组化研究

罗治彬  罗元辉      晋华源  张朋彬  徐采朴


中国人民解放军第三军医大学西南医院消化科  重庆市  400038
罗治彬,男,
1968-06-13生,重庆市垫江县人,汉族. 1992年临床医学本科毕业,1997年医学硕士,医师,主要从事消化系疾病的免疫病理及其防治研究,发表论文16.
项目负责人
  罗治彬,400038,中国人民解放军第三军医大学西南医院消化科.
Department of Gastroenterology, Southwest Hospital, Third Military Medical University, Chongqing 400038, China

Correspondence to
Dr. Zhi-Bin Luo, Department of Gastroenterology, Southwest Hospital, Third Military Medical University,
Chongqing 400038, China

Tel. 0086-23-68754000 Ext.73094

Email. zhibinluo@usa.net

收稿日期
  1999-11-25  接收日期  2000-01-12

Immunohistochemical study on dendritic cells in gastric mucosa of patients with gastric cancer and precancerous lesions

Zhi-Bin Luo, Yuan-Hui Luo, Rong Lu, Hua-Yuan Jin, Peng-Bin Zhang and Cai-Pu Xu


Abstract

AIM  To investigate the effect of dendritic cell (DC) on gastric mucosal immunity from expressions of S100, HLA-DR, CD4 and CD8 in human gastric mucosa.

METHODS  A total of 236 patients had gastric cancer (GC,n=143, chronic atrophic gastritis (CAG,n=41, dysplasia (Dys,n=15 and intestinal metaplasia (IM, n=27, and normal control group (n=10). All subjects were diagnosed with endoscopy and histopathology. The number, mean area and absorbance of S100+, HLA-DR+, CD4+ and CD8+ cells were detected by HE and immunohistochemical (SP method) staining and image analysis.

RESULTS  The number of S100+ (0.6μm2±0.2μm2) and HLA-DR+ (0.9μm2±0.2μm2) cells in gastric mucosa was significantly higher in patients with GC, CAG, Dys and IM than in normal control group (P0.05). The number of CD4+ cells (0.7μm2±0.2μm2)  were markedly lower in GC  than in normal control (2.3μm2±0.4μm2) and its mean absorbance (P0.01). The number of CD8+ cells (1.1μm2±0.3μm2) and its mean area and absorbance had no abvious difference between GC and normal (P0.05), but the number of CD8+ cells was higher in CAG, Dys and IM than in normal  (P0.05). The ratio of CD4 to CD8  was lower in GC (0.65), CAG (0.81), IM (0.59) and Dys (0.56) than in normal (1.94), P0.05.

CONCLUSION  The number of DC in gastric mucosa of precancerous lesions is increased and its function is enhanced, but they are positively correlated to the degree of differentiation in gastric cancer. Inhibited function of DC in gastric mucosa is one of important factors making immunity of gastric mucosa decrease and precancerous lesions change into cancer.

Subject headings  dendritic cell; gastric mucosal immunity; stomach neoplasms; precancerous lesions

Luo ZB, Luo YH, Lu R, Jin HY, Zhang PB, Xu CP. Immunohistochemical study on dendritic cells in gastric mucosa of patients with gastric cancer and precancerous lesions. Shijie Huaren Xiaohua Zazhi, 2000;8(4):400-402


摘要

目的  通过研究胃粘膜中S100+,HLA-DR+,CD4+CD8+产物的表达情况,以了解DC细胞在胃粘膜免疫中的作用.

方法
  胃癌(143)、慢性萎缩性胃炎(41)、不典型增生(15)、肠上皮化生(27)和正常对照组(10)236例,都经内镜和病理诊断明确. 采用HE染色、SP疫酶标抗体组化染色法与图象分析技术相结合,观察胃粘膜中S-100+,HLA-DR+,CD4+CD8+细胞数量、平均面积和平均吸光度的变化.

结果  胃癌患者胃粘膜中S-100+(0.6±0.2)μm2, HLA-DR+ (0.9±0.2)细胞数量明显多于正常胃粘膜(P0.05);CD4+细胞(0.7±0.2)μm2及其平均吸光度显著减少(P0.01);CD8+细胞数量(1.1±0.3)μm2、面积及其平均吸光度约有减少,但与正常组比较无显著差异(P0.05)CD4+/CD8+比值为0.7,显著低于正常胃粘膜(P0.01). 慢性萎缩性胃炎、肠上皮化生和不典型增生胃粘膜中S-100+分别为(1.8±0.3)μm2, (2.2±0.6)μm2(2.2±0.5)μm2HLA-DR+分别为(2.4±0.6)μm2, (3.0±0.8)μm2(2.8±0.6)μm2细胞数量显著增加(P0.01);CD8+细胞数量分别为(1.8±0.2)μm2 (1.9±0.2)μm2 (1.8±0.2)μm2均明显高于正常胃粘膜(P0.05);CD4+/CD8+比值分别为0.8 0.6 0.6,均显著低于正常胃粘膜(P0.05).

结论  癌前状态胃粘膜中DC数量显著增多,功能增强;而胃癌患者胃粘膜DC数量随分化程度的降低而减少. 胃粘膜中DC细胞功能的抑制是导致胃粘膜免疫功能低下和癌前状态发生癌变的重要原因之一.

主题词  DC细胞;胃粘膜免疫;胃肿瘤;癌前病变

罗治彬
,罗元辉,鲁荣,晋华源,张朋彬,徐采朴. 胃癌和癌前病变中树突状细胞的免疫组化研究. 世界华人消化杂志,20008(4)400-402



0 
引言

树突状细胞(dendritic cells,DC)是启动机体免疫应答的一组形态和功能特异的抗原提呈细胞(antigen presenting cell,APC. 近来国外学者开始研究DC和肿瘤发生发展的关系,但对在胃粘膜尤其是在癌前状态(precancerous condition)中DC的研究甚少. 我们采用HE染色、SP免疫酶标抗体组化染色法与图象分析技术相结合,观察胃癌、胃癌前状态和正常胃粘膜的免疫状况,探讨胃癌发生过程中胃粘膜免疫功能的变化及DC在其中所起的作用.

1  材料和方法

1.1 
材料 
西南医院消化内科1998年经内镜和病理诊断明确病变者共236例,包括胃癌组(gastric cancer, GC)143例(中分化腺癌74例,低分化腺癌32例,未分化癌37例),慢性萎缩性胃(chronic atrophy gastritis, CAG)41(中度萎缩性胃炎29例,重度萎缩性胃炎12)不典型增生(dysplasia, Dys)15例,肠上皮化生(intestinal metaplasia, IM)27例和正常对照组(normal, Nor)10.

1.2  方法  HE染色:全部切片重新评价,确认原诊断无误. 4μm连续切片,分别作HE染色. 疫组化染色用SP,抗人S100, HLA-DR, CD4, CD8 mAbSP试剂盒为DAKO公司产品,PBS替代一抗作空白对照. 结果判定:S100阳性染色位于细胞质内,HLA-DRCD4 CD8阳性染色位于细胞膜上,阳性结果为棕黄色. 染色结果用MD-20型图象分析仪(德国徕卡)测定粘膜层中阳性细胞数量(/μm2)、平均吸光度和平均面积(μm2).
    
统计学处理  采用第三军医大学数学教研室编制的数理统计程序包作方差分析,结果以均数及标准差(x±s)表示,P0.05为相差显著,P0.01为相差极为显著.

2  结果

2.1
DC
细胞质呈S100+阳性反应,正常胃粘膜中仅见少量散在分布于间质中. CAGIMDys胃粘膜中DC均成簇状分布,阳性细胞数分别为(1.8±0.3)μm2, (2.2±0.6)μm2(2.2±0.5)μm2,显著多于正常胃粘膜(0.2±0.1)μm2, P0.01),其平均面积明显大于正常组(P0.05). 胃癌组织内有较多DC散在分布,数量(0.6±0.2)μm2明显多于正常组(P0.05),但随着分化程度的降低而有逐渐减少的趋势. 各组S100阳性细胞计数、平均面积和平均吸光度(1). HLA-DR+细胞分布、图象分析及统计结果与S100+细胞类似(表2).

1  各组胃粘膜S-100+阳性细胞计数、平均面积和平均吸光度变化(x±s)

组别 n number/μm2 Area/μm-2 Absorbance
Nor 10 0.2±0.1 45.6±9.0 1.2±0.2
CAG 41 1.8±0.3b 67.6±11.4a 1.9±0.2a
IM 27 2.2±0.6b 68.5±10.5a 1.7±0.2a
Dys 15 2.2±0.5b 67.5±15.2a 1.6±0.2a
GC 143 0.6±0.2a 48.2±9.6 0.9±0.1a

aP0.05, bP0.01,  vs  Nor.A(Absorbance)=IOD÷Area

2  各组胃粘膜HLA-DR+阳性细胞计数、平均面积和平均吸光度变(x±s)

组别 n number/μm2 Area/μm-2 Absorbance
Nor 10 0.5±0.1 45.7±15.8 1.2±0.1
CAG 41 2.4±0.6b 66.4±10.6a 1.5±0.1
IM 27 3.0±0.8b 67.9±12.9a 1.7±0.1a
Dys 15 2.8±0.6b 64.8±15.1a 1.4±0.2
GC 143 0.9±0.2a 40.1±17.4 1.0±0.1a

aP0.05, bP0.01,  vs  Nor.

2.2  CD4+细胞散在分布于胃粘膜固有层中,阳性产物主要呈现在细胞膜上. 正常组CD4+细胞数为(2.3±0.4)μm2, CAGIMDys各组细胞数量分别为(1.4±0.2)μm2(1.1±0.2)μm2(1.0±0.1)μm2,均明显低于正常组(P0.05);而胃癌组细胞计数(0.7±0.2)μm2与平均吸光度显著低于正常组(P0.01,表3).

3  各组胃粘膜CD4+阳性细胞计数、平均面积和平均吸光度变化(x