摘要
目的探讨环氧化酶2(cox-2)及其抑制剂代他考昔在小鼠肝纤维化中的作用。方法选取6—8周成年雄性野生型小鼠或COX-2基因敲除小鼠共35只,其中5只野生型小鼠腹腔注射1ml/kg橄榄油为对照组,另外野生型小鼠及COX-2基因敲除小鼠各15只腹腔注射1ml/kg溶解于橄榄油的20%四氯化碳作为野生型实验组和基因敲除实验组。8周后检测各组小鼠肝组织病理改变以及血清透明质酸(HA)、IV型胶原(IV—C),III型前胶原(Pcm)及0l平滑肌肌动蛋白(仪.SMA)的表达;分离各实验组小鼠肝星形细胞,COX-2抑制剂代他考昔100Ixmol/L作用肝星形细胞24h后,检测药物作用前后细胞周期蛋白(cyclin)D、E表达的情况。结果总体各组小鼠HA、IV-C、PCIll、d·SMA表达差异均有统计学意义[对照组分别为:(180±13)μg/L、(56±9)μg/L、(39±13)μg/L、2.49%±0.24%,F=78.52、61.30、41.96、28.15,均P〈0.05]。野生型实验组小鼠血清HA、IV-C、d—SMA含量均高于基因敲除实验组(413±60)比(308±42)μg/L、(96±13)比(74±10)μg/L,8.99%±0.81%比4.72%±0.50%,均P〈0.05),两组PcⅢ差异无统计学意义[(82±12)比(72±15)μg/L,P=0.06]。野生型实验组肝星形细胞cyclinD、cyclinE表达均高于基因敲除组(0.96±0.15比0.76±0.10、0.94±0.13比0.824-0.09,P=0.02、0.04);代他考昔作用后野生型实验组及基因敲除实验组小鼠cyclinD、E则分别为(0.40±0.06、0.38±O.05,0.35±0.04、0.37±0.06),均明显低于未用药前(均P〈0.01)。结论COX-2能引起肝星形细胞活化、增殖导致肝纤维化;COX-2抑制剂能通过COX-2依赖途径和COX-2非依赖途径下调肝星形细胞cyclinD、cyclinE表达发挥抗纤维化作用。
Objective To explore the effects of cyclooxygenase-2 (COX-2) and its inhibitor valdecoxib in liver fibrosis. Methods Hepatic fibrosis was induced by carbon tetraehloride for 8 weeks in wild-type and COX-2 knockout mice. And the levels of hyalurouic acid ( HA ) , collagen IV ( IV-C ) , procollagen III( PC m ) and a-smooth muscle actin ( a-SMA ) were determined. Cyclin D and cyclin E were measured in hepatic satellite cell (HSC) after a treatment of valdecoxib for 24 h or not. Results HA, IV- C, PC m and ct-SMA all had significant difference in 3 groups (control group:( 180 ± 13 )μg/L, (56 ± 9 )μg/L, (39 ±13)μg/L, 2.49% ±0.24% in control, F=78.52, 61.30, 41.96, 28.15, all P〈0.05). HA, 1V-C and a-SMA in wild-type liver fibrosis mice were higher than those in knockout counterparts ( (413 ±60) vs (308 ±42) p,g/L, (96 ± 13) vs (74 ± 10 ) μg,/L, 8.99% ±0. 81% vs 4.72% ±0. 50%, all P 〈 0. 01 ). But PC Ill were similar between two groups ( ( 82 ± 12) vs (72 ± 15) μg/L, P = 0. 06). Wild-type mice expressed higher levels of eyelin D and cyelin E than those of knockout mice (0. 96 ± 0. 15 vs 0. 76 ± 0.10 , 0.94±0. 13 vs0.82±0.09, P=0.02, 0.04). The rates of eyelin D andcyelinEwere 0.40 ± 0. 06 and 0. 38 ± 0. 05, 0. 35 ± 0. 04 and 0. 37 ± 0. 06 respectively after a treatment of valdeeoxib. And both deceased in hepatic satellite eell of wild-type and knockout mice ( both P 〈 0. 01 ) versus those without valdeeoxib. Conclusions COX-2 increases the activation and proliferation of HSC leading to liver fibrosis. And its inhibitor may depress liver fibrosis by decreasing the expressions of eyclin D and eyelin E in COX-2 dependent and(or) independent way.
出处
《中华医学杂志》
CAS
CSCD
北大核心
2014年第10期784-787,共4页
National Medical Journal of China