Objective To study the expression levels of serum HSP70 and p53 in gastric cancer and its cor-relation with helicobacter pylori infection.Methods 50 patients with gastric cancer were selected as the research object.Among 50 cases,30 cases were stage Ⅰ -Ⅱ,20 cases were stage Ⅲ,22 cases were with lymph node metasta-sis and 28 cases were without lymph node metastasis.40 healthy subjects were selected as the healthy control group. The serum levels of HSP70 and p53 were detected.Results In the gastric cancer group,the serum levels of HSP70 and p53 were markedly higher than those of the healthy control group,and the difference was statistically significant (t =12.53,16.79,all P <0.01).Moreover,with progressing of clinical stage of gastric cancer,the serum levels of HSP70 and p53 showed a trend of increasing(t =4.68,5.29,all P <0.01).The serum expression levels of HSP70 and p53 in gastric cancer with lymph node metastasis were significantly higher than those of patients without lymph node metastasis and the difference was still statistically significant(t =3.82,4.39,all P <0.01).The serum levels of HSP70 and p53 in the gastric cancer group with Hp positive were much higher,compared to those of cases with Hp negative and the difference was also statistically significant(t =4.72,4.17,all P <0.01).Conclusion In the gastric cancer patients,the serum expression level of HSP70 and p53 are increased.The expression of HSP70 and p53 are closely related to the progress and prognosis of gastric cancer and Hp infection.

Growth hormone (GHRH) and pitutary adenylate cyclase activating peptide (PACAP) are the members of the PACAP/Glucagon superfamily,who are related in both sequence and function.Their stimulation of GH secretion and animal growth is concerned.A series of expression plasmid,pIRES1-GHRH-PACAP (P-G-P),plRESI-GHRH (P-G) and plRESI-PACAP(P-P),were constructed,extracted and purified,then transfected into CHO cell line with Lipofectamine.The expression was examined by RT-PCR,dot-ELISA and Western blotting.The biological activity of expression products was detected in rats.At 8 h after injection of transfection supematant,serum IGF-I concentrations in P-G-P group were significantly higher than that in other groups(P ＜ 0.05).PLGA encapsulating plasmid microspheres were prepared and injected intramuscularly into rabbit legs.Growth behavior and IGF-1 level were measured at day 0,15,30 and 45 after injection.Greater body weights gain and higher serum 1GF- [ levels were observed in three plasmid microsphere injection groups,compared with control group.At day 30,the body weight gain in P-G-P group was greater than saline group (81%,P＜ 0.01),P-G mierosphere group (15%,P＜ 0.05) and P-P microsphere group (7%,P＞ 0.05),serum IGF-I concentration in P-G-P microsphere group showed a 16.68% increase to P-G microsphere (P ＞ 0.05),a 17.14% increase to P-P microsphere(P ＞ 0.05) and a 50.46% increase to control (P ＜ 0.05).These results suggest that co-expression of GHRH and PACAP in one expression plasmid might exert an additive stimulation of GH secretion and growth when delivered into rabbit skeletal muscle with PLGA mierosphere.The results may provide a new approach to regulate animal growth.