目的探讨人乳牙牙髓干细胞（stem cells from the pulp of human exfoliated deciduous teeth，SHED）和恒牙牙髓干细胞（dental pulp stem cells，DPSC）的一般生物学特性及与唾液腺分泌相关分子的表达差异，为使用SHED或DPSC治疗唾液腺分泌功能低下提供依据。方法分别培养SHED和DPSC至第4、7代，使用组织块法原代培养人下颌下腺上皮和间质细胞，使用相差显微镜观察细胞形态；使用流式细胞术检测干细胞表面标志物；分别使用细胞计数试剂盒（cell counting kit-8，CCK-8）、长时间动态活细胞成像及数据分析系统IncuCyte ZOOM检测细胞增殖；使用实时荧光定量PCR检测与分泌相关的分子表达。结果第4和7代SHED及DPSC均呈长梭形贴壁生长。4组细胞均阳性表达间充质干细胞表面标志物CD29、CD44、CD73和CD90，阴性表达上皮干细胞标志物CD49f和CD117。4组细胞增殖无差异。与第4代SHED相比，第7代SHED中与水分泌相关的毒蕈碱型乙酰胆碱受体1（muscarinic acetylcholine receptor 1，MR1）和MR3、水通道蛋白5（aquaporin 5，AQP5），与蛋白质分泌相关的β1-肾上腺素受体（β1-adrenoceptor，β1-AR）及分泌蛋白α-淀粉酶和黏蛋白5B的表达差异均无统计学意义（P〉0.05），β2-AR的表达显著降低（P〈0.05）。与第4代DPSC相比，第7代DPSC中MR3、β2-AR和α-淀粉酶表达差异无统计学意义（P〉0.05），而MR1、AQP5、β1-AR和黏蛋白5B表达降低（P〈0.05）。与1例同年龄段人的下颌下腺组织及其原代上皮细胞相比，第4和7代SHED中各分子表达均低。与同年龄段人的下颌下腺原代上皮细胞相比，第4代DPSC中AQP5表达显著降低（P〈0.05），其他分子表达差异无统计学意义（P〉0.05）；第7代DPSC中AQP5、β1-AR、α-淀粉酶和黏蛋白5B表达显著降低（P〈0.05），其他分子表达差异无统计学意义（P〉0.05）。第4和7代DPSC中各分子的表达均显著低于人下颌
Salivary gland tumors are a group of the most common tumors in the oral and maxillofacial region. They have features with complicated histopathologic classification and wide distribution. There is little knowledge on the clinicopathologic characterics and clinical behaviors of salivary gland tumors of various locations and subtype. The management of salivary gland tumors is also contraversial. Biopsy is not suggested because of seeding of tumor cells. Therefore adjunctive methods are important for preoperative diagnosis. Since 1985, our research group has performed a series of basic and clinical researches on salivary gland tumors including clinicopathologic characteristis and behavior, preoperative adjunctive diagnosis, mechanism, prevention and treatment of distant metastasis of salivary adenoid cystic carcinoma, and histogenesis of salivary gland tumor. These studies have improved our knowledge on the clinical, histopathological, cytological, imaging features, and biobehavior of different types of slivary gland tumors. We have also suggested related principles of management, modified the operative methods of benign tumor of parotid gland. Our efforts have raised the standards of diagnosis and treatment of salivary gland tumors.
