PURPOSE: Recently, interest in peroxisome-proliferator-activated receptors (PPAR) has increased, although clinical studies of the effect of PPAR-gamma expression on gastric cancer have not been reported yet. In this study, we investigated the role of PPAR-gamma expression in gastric cancer patients. MATERIALS AND METHODS: One hundred twenty-eight (128) samples of both gastric cancer and normal tissues were obtained from 128 patients who had undergone at a curative gastrectomy at Seoul Medical Center from Jan. 2001 to Dec. 2005. PPAR-gamma expression was determined by using immunohistochemical staining, and the results were analyzed. The statistical analysis was based on clinicopathological findings and the differences in survival rates. RESULTS: The mean age of the patients was 61, and the male:female ratio was 1.9:1. PPAR-gamma expression was significantly higher in cancer tissues than in normal tissue (81.3% vs. 57.0%, P<0.001). There was insignificant difference between well and moderately differentiated types and poorly differentiated types in terms of the expression of PPAR-gamma (87.0% vs. 74.6%, P=0.074). In the univariate analysis the survival rate was significantly increased when PPAR-gamma was expressed in normal tissue (P=0.003). In the multivariate analysis, only the UICC TNM staging had significance related to the survival rate. CONCLUSION: The rate of PPAR-gamma expression was higher in cancer tissue than it was in normal tissue from gastric cancer patients. In the univariate analysis, PPAR-gamma expression in normal tissue had significance with respect to survival, but the multivariate analysis showed no such significance. Thus, we should further evaluate more cases to determine whether or not such a significance exists.
Gastrectomy ; Humans* ; Multivariate Analysis ; Neoplasm Staging ; Peroxisome Proliferator-Activated Receptors ; Seoul ; Stomach Neoplasms* ; Survival Rate

The saponins in different parts of Gynostemma pentaphyllum were analyzed via UPLC-Q-TOF-MS~E. A total of 46 saponins were identified, and the underground part had 26 saponins more than the aboveground part, most of which were trisaccharide saponins. The rat model of hyperlipidemia was established with high-fat diet. This study explored the lipid-lowering activity of total saponins in the underground part of G. pentaphyllum, so as to provide a theoretical basis for the comprehensive utilization of the underground part of G. pentaphyllum. A total of 99 healthy SD rats were randomly assigned into a blank group, a model group, a positive drug group, an aboveground total saponins group, and low-, medium-, and high-dose underground total saponins groups. Except the blank group, the other groups were fed with high-fat diet for 6 weeks. Then, the blood was collected from the orbital cavity to determine whether the modeling was successful according to the serum levels of total cholesterol(TC) and triglyceride(TG). After intragastric administration of the corresponding agents for 30 continuous days, the physical state of the rats were observed, and the body weight and liver specific gravity were measured. Furthermore, the levels of TC, TG, low-density lipoprotein cholesterol(LDL-C), high-density lipoprotein cholesterol(HDL-C), alanine transaminase(ALT), aspartate transaminase(AST), bilirubin, and total bile acids in serum, as well as the levels of superoxide dismutase(SOD), malondialdehyde(MDA), peroxidase proliferator-activated receptor(PPAR-γ) in the liver tissue, were determined. The pathological changes of liver was observed via HE staining. The results showed that the aboveground total saponins and medium-and high-dose underground total saponins can treat hepatocyte steatosis, lower TC, TG, LDL-C, ALT, AST, total bilirubin, MDA, and PPAR-γ levels, and increase HDL-C and SOD levels in the model rats. The effect tended to be more obvious with the increase in dosage. Therefore, the total saponins in the underground part of G. pentaphyllum have good pharmacological effect of reducing blood lipid, which provides a theoretical basis for the comprehensive utilization of the underground part of G. pentaphyllum.
Alanine Transaminase/analysis* ; Animals ; Aspartate Aminotransferases/analysis* ; Bile Acids and Salts/blood* ; Bilirubin/blood* ; Cholesterol, LDL/blood* ; Diet, High-Fat/adverse effects* ; Gynostemma/chemistry* ; Hypolipidemic Agents/therapeutic use* ; Lipoproteins, HDL/blood* ; Liver/metabolism* ; Malondialdehyde/analysis* ; Peroxisome Proliferator-Activated Receptors/analysis* ; Rats ; Rats, Sprague-Dawley ; Saponins/therapeutic use* ; Superoxide Dismutase ; Triglycerides/blood* ; Trisaccharides/therapeutic use*