肝癌组织和细胞系PML蛋白表达及As_2O_3对其表达的调节作用

The PML protein expression of hepatocellar carcinoma and As_2O_3 regulated its expression

目的：观察肝癌（HCC）组织及细胞系PML蛋白表达和三氧化二砷（As2 O3）对HCC PML蛋白表达的调节作用。方法免疫组织化学法检测不同分化程度HCC组织PML蛋白表达水平，Western blot分析12例 HCC患者的癌组织，和 HuH7、HepG2、Hep3B、SMMC-7721、MHC97H等5种 HCC细胞系PML蛋白表达情况。观察低浓度As2O3处理72～96 h后，HuH7， HepG2，Hep3B、SMMC-7721、MHC97H细胞PML蛋白表达变化。结果免疫组织化学染色显示，HCC组织中细胞核、细胞质均有不同程度PM L蛋白表达，细胞内分布不均匀。高分化、中分化和低分化 HCC组织 PM L 蛋白表达差异不明显。Western blot分析发现12例HCC组织均有不同程度PML蛋白表达，而且各例 HCC的PML蛋白表达量不同。 HuH7、HepG2、Hep3B、SMMC-7721和MHC97H等5种细胞系均表达PML蛋白，而且PML蛋白灰度相差很小。 HuH7、HepG2、Hep3B、SMMC-7721、MHC97H经过0．25μg/mL的As2O3培养72～96 h后PML蛋白表达明显减少，As2O3可以下调肝癌细胞PML蛋白表达。结论 HCC组织和细胞系存在PML蛋白表达，而且As2O3可以调控肝癌细胞PML蛋白表达，PML蛋白可能是As2O3治疗肝癌的靶分子。

Objective To observe the PML protein expression of hepatocellar carcinoma tissue and cells lines and As 2 O3 regulate its expression .Methods Immunohistochemistry was used to examine the PML protein expression of hepatocellar carcinoma tissue . Western blot analysis were used to observe PML protein expression of hepatocellar carcinoma tissue of 12 cases ,5 hepatocellar car-cinoma cell lines ,such as HuH7 ,HepG2 ,Hep3B ,SMMC-7721 ,MHC97H .Western blot analysis was used to detected the PML pro-tein expression of these hepatocellar carcinoma cell lines after 72-96 h treated with 0 .25 μg/mL of As2 O3 .Results Immunohisch-enmical staining showed that the PML protein was expressed in both cytoplasm and nucleus ,did not well-distributed in hepatocellar carcinoma cells .There was no significant differences of PML protein expressed among differently differentiated stages of hepatocel-lar carcinoma cells .Western blot analysis found that hepatocellar carcinoma tissues of 12 cases with hepatocellar carcinoma ex-pressed PML protein ,and there was significant difference of PML protein expressed among 12 cases suffer with hepatocellar carci-noma .hepatocellar carcinoma cell lines ,such as HuH7 ,HepG2 ,Hep3B ,SMMC-7721 and MHC97H all expressed PML protein ,and there was little difference of PML protein expressed among hepatocellar carcinoma cell lines .The PML protein expression of HuH7 ,HepG2 ,Hep3B ,SMMC-7721 and MHC97H cell after 72-96 h treated with 0 .25 μg/mL of As2O3 significant decreased . Conclusion Hepatocellar carcinoma tissue and cells may express PML protein ,and As2 O3 may regulate this protein expression as well .PML protein may be the target molecule of As2 O3 treating HCC .