Objective To investigate the effect of Bmal1 on proliferation in gastric cancer cells and the molecular mechanism, and to provide theoretical and experimental basis for further research targeting circadian therapy for gastric cancer. Methods Applying RNAi technique to silence Bmal1 gene in BGC823 was regarded as experimental group. The normal BGC823 was as control group. The inhibitory effect of the cell line was measured by MTT assay. The mRNA expression of p53, c-Jun and c-Fos was evaluated by real-time RT-PCR. Results Comparing with the data of control group,the inhibitive rates of cell growth in experimental group after 6 h,12 h,24 h were 5.78%(P=0.001),9.20%(P=0.00)and 83.08%(P=0.00)respectively. Down-regulation of Bmal1 decreased p53 (P<0.05), while increased c-Fos and c-Jun expression (P > 0.05). Conclusion RNAi targeting Bmal1 has effects on gastric cancer proliferation by down-regulating p53 mRNA.

Objective To study the value of combined parenteral and enteral nutrition support with chemotherapy for advanced gastrointestinal cancer in elder patients.Methods Totally 79 patients admitted from 2006 to 2011 were randomly divided into two groups using random number table:the treatment group (n=42) was provided with combined parenteral and enteral nutrition support and chemotherapy,the control group(n =37) was treated with chemotherapy only.Nutritional risks were screened at admission.After two cycles of chemotherapy,the nutritional status,Karnofsky performance score,toxic reaction,and nosocomial infection rate were compared betweeen these two groups.Results After 2 cycles of chemotherapy,the body mass index[(19.00±3.31) kg/m2 vs.(18.24±1.98) kg/m2,P=0.04],albumin [(33.90±1.50) g/Lvs.(29.90±2.38) g/L,P=0.02],prealbumin [(28.19±1.50) g/Lvs.(25.51 ±8.38) g/L,P=0.01],hemoglobin [(107.0 ± 6.90) g/L vs.(104.20 ± 9.70) g/L,P =0.02],and lymphocyte levels [(2.99 ±0.55) × 109/L vs.(2.63 ±0.20) × 109/L,P =0.03] were all significantly higher in the treatment group.The incidence of myelosuppression in the treatment group was 28.57％,significantly lower than that in the control group (83.78％,P =0.00) ; such difference was also detected in patients with nutritional risk in the 2groups (31.03％ vs.95.45％,P =0.00).The incidences of nosocomial infection in the treatment group were significantly lower than in the control group after both the first and the second cycle of chemotherapy (0 vs.10.81％,P=0.03; 2.38％ vs.27.03％,P=0.02).Conclusions Combined enteral and parenteral nutrition support with chemotherapy in elderly patients with advanced gastrointestinal caner could improve nutritional status,reduce toxic reaction,and prevent nosocomial infection.Therefore combined nutrition support is a safe and effective approach for elderly patients with advanced gastrointestinal cancer.