Objective To study the expression of HDAC2 in lung of smoke cessation and smoking cessation rats,Methods Forty SD rats were divided into five groups randomly:normal control group (group A),1-month smoking group (group B,),2-month smoking group (group C),1-month smokingcessation group(group D),2-month smoking-cessation group(group E).Group B rats were exposured to cigarettes for 1 month,C,D,E were exposured to cigarettes for 2 months.At 1 month,group B were sacrificed,at 2 month,group C were sacrificed,group D was smoking cessation for 1 month and group E for 2 months.Pathomorphological changes of the small airway were analyzed,and then study the HDAC2 in rats'lung tissue.Results Compared with group A,the levels of HDAC2 in group B,group C,group D,group E were decreased (P ＜ 0.01),but smoking groups levels were lower than smoking-cessation groups.In smoking groups,group C was lower than group B.In smoking-cessation groups,group D was lower than group E.Conclusion It shows that the levels of HDAC2 in rats' lung tissue decrease after smoking exposure.It can recrease after quitting,but still cant back to normal.

Objective To study the expression of clusterin (CLU) and P-glycoprotein (P-gp) in hepatic cell carcinoma (HCC) and its relationship.Methods The expression of CLU gene in the tissue of H CC (41 cases),cirrhosis(10 cases) and normal liver (10 cases) and the expression of P-gp in the tissue of HCC were detected by immunohistochemical method.Results The positive expression rate of CLU was 82.93％(34/41) in HCC,and negative or weak positive were detected in cirrhosis and normal liver tissue.The positive expression rate of CLU was significantly correlated with Edmondson's histological grade (P ＜ 0.05),but had no correlation with patients' age,sex and cirrhosis (P ＞ 0.05).The positive expression rate of P-gp in HCC was 70.73％(29/41).There was significant correlation between the expression of CLU and P-gp (P ＜ 0.05).Conclusions The over expression of CLU is significantly associated with clinical multidrug resistance in HCC.It should be a potential target for treatment of HCC.