目的 尽管 TSH 被认为和甲状腺癌的发病率和预后密切相关，但是具体潜在机制还没有被阐明。本研究拟探讨乳头状甲状腺癌中 TSH 是否能调控 Cpt1c 表达，同时研究 TSH 对 Cpt1c 促进乳头状甲状腺癌细胞增殖的影响。方法 首先收集甲状腺癌及其配对的癌旁正常组织标本，利用 qRT-PCR 法检测 Cpt1c 基因在 35 对乳头状甲状腺癌标本及其配对的癌旁正常组织的表达情况；其次分别在浓度梯度和时间梯度上检测 TSH 对甲状腺癌细胞株 B-CPAP 中 Cpt1c 表达的影响；最后构建 Cpt1c 干扰 RNA，转染 B-CPAP 细胞株，利用免疫印迹法检测和 qRT-PCR 方法对肿瘤细胞转染干扰 RNA 效率进行鉴定。鉴定完毕后，利用 CCK-8 和 FACS 细胞仪分别检测 TSH 刺激下的细胞增殖和细胞周期。结果 Cpt1c 在乳头状甲状腺癌组织中高表达于正常癌旁组织；TSH 可促进乳头状甲状腺癌细胞株 B-CPAP 中的 Cpt1c 表达，并且呈浓度依赖性，随着浓度的增高，Cpt1c 表达亦增加；Cpt1c 干扰可通过 S 期停滞影响甲状腺癌细胞增殖，同时可通过促进 Cpt1c 表达引起细胞进入 G2 期从而引起更强的增殖能力。结论 TSH 通过调节 Cpt1c 表达可以促进乳头状甲状腺癌细胞增殖，Cpt1c 基因将 来可能成为乳头状甲状腺癌基因治疗的新靶点。

Objective Though TSH is closely related to the incidence and prognosis of thyroid carcinoma, the underlying mechanisms have not been elucidated. This study was to investigate whether thyroid stimulating hormone in papillary thyroid carcinoma can regulate the expression of Cpt1c and to investigate the effect of Cpt1c on TSH promoting the proliferation of papillary thyroid carcinoma cells. Methods Firstly, the expression of Cpt1c was detected by qRT-PCR in 35 papillary thyroid carcinoma specimens and their adjacent normal tissues from papillary thyroid carcinoma patients. Secondly, the effects of TSH on the expression the Cpt1c from B-CPAP was detected at time and concentration gradient respectively. Finally, Cpt1c siRNA was constructed and transfected into B-CPAP. Western blot and qRT-PCR were used to identify the siRNA transfection efficiency of tumor cells. After identification, CCK-8 and FACS were used to detect cell proliferation and cell cycle with stimulation of TSH. Results Cpt1c is highly expressed in human papillary thyroid cancer compared with paired normal tissues. TSH could promote the expression of Cpt1cin a dose-dependent manner. Cpt1c could affect the proliferation of thyroid cancer cells by S phase stagnation and the expression of Cpt1c in papillary thyroid carcinoma is higher than that in adjacent tissues. At the same time, TSH could promote Cpt1c expression caused by cells into the G2 phase to increase proliferation. Conclusions TSH could promote the proliferation of papillary thyroid carcinoma cells by regulating the expression of Cpt1c. Cpt1c gene may be a new target for the treatment of papillary thyroid cancer in the future.