胸苷酸合成酶在涎腺肌上皮细胞中的表达和临床意义

Expression of thymidylate synthase in salivary adenoid myoepithelial cells and its clinical significance

目的研究胸苷酸合成酶(TS)在涎腺肌上皮细胞中的表达及临床意义。方法应用免疫组化EnVision法检测TS、p63、Calponin、CK5/6、S-100在32例不同类型涎腺病变组织中的表达,包括非肿瘤性和涎腺炎性样本10例、混合瘤样本11例、基底细胞癌样本5例和腺样囊性癌样本6例。评估TS作为涎腺肌上皮细胞特异性分子标志的特异性、敏感性。结果 TS在各种涎腺组织中的表达模式与P63的表达完全一致,均能在涎腺肌上皮细胞中呈清晰的胞核型强阳性表达;同时,Calponin、CK5/6、S-100在涎腺肌上皮细胞中呈质/膜型阳性表达;此外,TS在少数涎腺腺上皮细胞、癌细胞和散在的少数间质细胞胞浆中呈弱阳性或中等强度阳性表达,但在细胞核中呈阴性表达。统计学分析结果显示TS在涎腺肌上皮细胞中的表达与p63、Calponin、CK5/6、S-100具有高度一致性(P>0.05),除与CK5/6在涎腺炎和涎腺组组表达比较之外,Kappa>0.75,且具有100%的特异性和敏感性。结论胸苷酸合成酶可作为一种新的特异性涎腺肌上皮细胞标志物,并用于涎腺肿瘤的诊断和鉴别诊断。

Objective To evaluate the expression of thymidylate synthase(TS) in myoepithelial cells(MECs) of salivary adenoid tissues and explore its clinical significance. Methods Immunohistochemical staining EnVision method was used to detect the expression of TS, P63, Calponin, CK5/6 and S-100 in 32 salivary gland specimens, including 10 non-neoplastic and salivary inflammation specimens, 11 mixed tumor specimens, 5 basal cell carcinoma specimens and 6 adenoid cyst carcinoma specimens. The specificity and sensitivity of TS as a specific molecular marker of salivary muscle epithelial cells were evaluated in comparison with P63, Calponin, CK5/6 and S-100. Results The expression pattern of TS in all the salivary gland tissue specimens was identical with that of p63. TS and P63 both showed strong immunohistochemical expressions in MECs of salivary adenoid tissue specimens. Calponin, CK5/6, and S-100 showed cytoplasmic/membranous expressions in the MECs. In addition, TS exhibited weak or moderate cytoplasmic expression in a few salivary gland epithelial cells, cancer cells and scattered stromal cells, with negative expression in the cell nuclei. The expression of TS in the MECs of all the salivary adenoid specimens was highly consistent with those of P63, Calponin, CK5/6 and S-100(P>0.05) Except for CK5/6 expression in Salivary inflammation and Salivary gland specimens. Kappa>0.75. The specificity and sensitivity of TS as a molecular marker of MECs were both 100%. Conclusion TS is a new specific marker of MECs for differential diagnosis of salivary gland tumors.