姜黄素抑制肝癌细胞系HepG2的增殖、侵袭及其机制

目的:探索姜黄素对肝癌HepG2细胞系增殖、侵袭能力的影响及其可能机制。方法:用不同浓度的姜黄素处理人肝癌HepG2细胞,MTT法检测细胞增殖,采用Transwell 实验检测细胞的侵袭能力。分别提取细胞总mRNA及总蛋白,运用实时定量PCR（qRT-PCR）及Western blotting方法来检测姜黄素对HepG2细胞侵袭相关分子（MMP-2及MMP-9）及COX-2表达影响。结果:不同剂量的姜黄素均可以抑制肝癌HepG2细胞的增殖活性,与对照组相比差异显著（P＜0.05）;随着姜黄素浓度的增加,HepG2细胞的侵袭能力逐渐降低;姜黄素可以从mRNA及蛋白水平下调侵袭相关分子MMP-2、MMP-9的表达;姜黄素可以下调COX-2的mRNA及蛋白表达水平,与对照组相比差异有统计学意义。结论:姜黄素可以抑制肝癌HepG2细胞的增殖及侵袭能力,该作用可能与下调侵袭相关分子及COX-2的表达有关。     

Prognostic value of postoperative stimulated thyroglobulin levels on 131Ⅰ ablation therapy in papillary thyroid cancer

Objective Stimulated thyroglobulin (Tg) levels postablation was associated with disease recurrence in papillary thyroid cancer (PTC). The aim of this study was to evaluate the prognostic value of postoperative stimulated Tg level on future Tg positivity after 131Ⅰ ablation therapy in PTC. Methods One hundred and thirty-eight patients (28 men, 110 women; age range 6-70 years, mean age 39.4 years) with PTC were included in this study. All patients underwent total or near-total thyroidectomy, and 102 of these patients had lymphadenectomy. All patients had a documented PTC. 131Ⅰ ablation was performed in 3- 4 weeks after thyroidectomy. Sera levels of thyroid hormones (FT3, FT4), thyrotropin (TSH), anti-Tg anti-body (TgAb), and Tg were measured before and after 131Ⅰ ablation. Statistical analysis was performed with SPSS 13.0 software, and correlation anaysis and t-test were used. Results Postoperative stimulated Tg lev-el had a significantly positive association with pestablation stimulated Tg level (r = 0. 960, P < 0.01). Postoperative stimulated Tg level in positive postablation Tg group was significantly higher than that in nega-tive pestablation Tg group [(199.8±327.7) μg/L vs (3.5±5.6) μg/L, t =5. 567, P <0.01]. About 76% (78/102) patients had evidence of metastatic cervical lymph nodes on routine histological testing. And 41% (446/1088) resected lymph nodes were histologically positive for metastatic disease. The number of metastatic lymph nodes resected had a significantly positive relationship with stimulated Tg at pestopera-tion and postablation (r = 0. 697, 0. 633, both P < 0.01). Conclusions Postoperative stimulated Tg level was of better prognostic value on stimulated Tg level after 131Ⅰ ablation therapy. Total or near-total thyroidec-tomy simultaneously conjugated with lymphadenectomy might have a better result in lower postablation stimu-lated Tg pesitivity in patients with PTC.