目的:研究胰岛素样生长因子结合蛋白3(IGFBP-3)在唾液腺多形性腺瘤(SPA)中的表达.方法:采用Western blot检测IGFBP-3在40例SPA、40例正常腺体组织及10例恶性唾液腺肿瘤组织中的表达.采用实时荧光定量PCR(qRT-PCR)检测IGFBP-3 mRNA在50例SPA组织、50正常腺体组织及10例唾液腺恶性肿瘤中的表达.结果:IGFBP-3蛋白在唾液腺正常组织(N组:8.54 ±3.95)的表达(A值)显著高于多形性腺瘤组(PA组:4.78 ±2.07)及恶性肿瘤组(CA组:3.63 ±2.27)(P＜0.05).而PA组与CA组之间则不存在显著差异(P＞0.05).IGFBP-3 mRNA在SPA组织与恶性肿瘤组织中的表达均低于正常组织(PA/N组:0.654 ±0.387,CA/N组:0.452±0.229),PA组与CA组不存在显著差异(P＞0.05);不同包膜浸润程度的多形性腺瘤组织中相对含量的差异有统计学意义(P＜0.05),在年龄、性别及有无复发上无明显差异.结论:IGFBP-3在多形性腺瘤中的低表达可能减低了拮抗IGF-1R的作用,引起肿瘤细胞的增殖,促进肿瘤形成.%Objective:To investigate the expression of insulin-like growth factor binding protein 3 (IGFBP-3) in salivary pleomorphic adenoma(SPA).Methods:The expression of IGFBP-3 protein in 40 cases of SPA(group SPA),40 of normal glandular tissue(group N) and 10 of salivary gland malignant tumor(group CA) was detected by Western blot.The expression of IGFBP-3 mRNA in 50 cases of SPA,50 of salivary gland normal tissue and 10 of CA was detected by qRT-PCR.Results:The expression(A value) of IGFBP-3 protein in group N,SPA and CA was 8.54 ± 3.95,4.78 ± 2.07,3.63 ± 2.27 respectively.The expression ration of IGFBP-3 mRNA of group N vs SPA or CA,P ＜ 0.05;SPA vs CA,P ＞ 0.05 (SPA/N was 0.654 ± 0.387,CA/N:0.452 ± 0.229) respectively,but showed no significance difference between SPA and the CA groups(P ＞ 0.05).Difference of IGFBP-3 mRNA expression was observed with different envelope infiltration of SPA (P ＜ 0.05),no significant difference was observed in different age,gender or relapse groups.Conclusion:IGFBP-3 Low expression of IGFBP-3 in pleomorphic adenomas may reduce the antagonism of IGF-1R,causing the proliferation of tumor cells and promote tumor formation.
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