Function of apoptosis and expression of the proteins Bcl-2,p53 and C-myc in the development of gastric cancer

INTRODUCTIONIn China ,the incidence and mortality of gastric cancer rank the second among all cancers. Recent development of cancer [1-20].The aim of this study was investigat the insight of apoptosis and bcl-2, p53 and C-myc protein expression in the development of gastric cancer .

Effect of heparin on apoptosis in human nasopharyngeal carcinoma CNE2 cells

In order to study the mechanism of the effect of heparin on apoptosis in carcinoma cells, the nasopharyngeal carcinoma cell line CNE2 was used to identify the effect of heparin on apoptosis associated with the expression of c-myc, bax, bcl-2 proteins by use of Hoechst 33258 staining, terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL), agarose gel electrophoresis, and flow cytometry, as well as Western blot analysis. The results showed that heparin induced apoptosis of CNE2 cells including the morphologic changes such as reduction in the volume, and the nuclear chromatin condensation, as well as the 'ladder pattern' revealed by agarose gel electrophoresis of DNA in a concentration-dependent manner. The number of TUNEL-positive cells was dramatically increased to 33.6+/-1.2% from 2.8+/-0.3% by treatment with heparin in different concentrations (10 to approximately 40 kU/L). The apoptotic index was increased to 32.5% from 3.5% by detecting SubG1 peaks on flow cytometry. Western blot analysis showed that levels of bcl-2, bax and c-myc were significantly overexpressed by treatment with the increase of heparin concentrations. These results suggest that heparin induces apoptosis of CNE2 cells, which may be regulated by differential expression of apoptosis-related genes.

Regulating Effects of Herb Cake-partitioned Moxibustion on the Expression of p53 and C-myc Protein in Rats with Ulcerative Colitis

Objective： To investigate the mechanism of herb cake-partitioned moxibustion treating ulcerative colitis （UC） from the relationship between expression of p53 and C-myc protein, and morbidity of UC. Methods： Rats model of UC was made with immune methods and local stimulation. Forty SD rats were divided into normal, model, herb cake-partitioned, and mild moxibustion group by a random number table, 10 rats in each group. Hanging moxibustion in the mild moxibustion group was applied to Tianshu （ST 25） and Qihai （CV 6） for 10 rain. Two moxa cones of herb cake-partitioned moxibustion were applied to the same acupoints respectively, in the herb cake-partitioned moxibustion group. Expression of p53 and C-myc protein was measured with immuno- histochemistical method in the colonic tissue of rats with UC. Results： Postive area, strength, and the immunohistochemistry index of the expression of p53 and C-myc protein were found more in the model rats than those in the normal rats （P〈0.01）, whereas less in the herb cake-partitioned moxibustion and mild moxibustion groups than those in the model group （P〈0.01）. Conclusion： p53 and C-myc play important roles in the morbidity and development of UC, and herb cake-partitioned moxibustion could regulate the expression of p53 and C-myc protein in the colonic tissue of UC rats.

Effects of External Application of Chinese Medicine on Diabetic Ulcers and the Expressions of β-catenin,c-myc and K6

Objective：To observe the clinical efficacy of Chinese medicine（CM） treatment of Hongyou Ointment（红油膏） and Shengji Powder（生肌散） on diabetic ulcers,and to observe the influence of CM treatment on the expressions of proteins associated with the Wnt signaling pathway,such asβ-catenin,c-myc and K6.Methods：sixty-two patients fitting the registration standards were randomly divided into the CM group（31 patients） and the Western medicine（WM） group（31 patients） by a random number table.The patients in the CM group were treated with Hongyou Ointment and Shengji Powder externally.The patients in the WM group were treated with mupirocin ointment,growth factor（bFGF）,and Vaseline gauze for external use and with basic therapies.Wound-healing time and four-week healing rate were recorded.The wounds were measured by digital photography and ImageJ software.Skin biopsies were obtained from 24 patients before CM treatment and 20 patients after CM treatment.Immunohistochemical tests and semi-quantitative imaging with NIH ImageJ 1.42 software were used to analyze the changes in protein expression ofβ-catenin,c-myc,and K6.Results：Fifty-three patients completed the trial;four patients in the CM treatment group and five patients in the WM group dropped out.Among them,four were dissatisfied with the treatment process,two could not continue because of their jobs,two failed to complete the course of follow-up appointments,and one was diagnosed with squamous cell carcinoma during treatment.The comparison of ulcer healing rates between the two groups showed insignificant differences（P=0.77）.The ulcer healing rates were 33.33%（9/27） in the CM group and 26.92%（7/26） in the WM group.However,the effective rate was significantly higher in the CM group（81.48%,22/27） than in the WM group（57.69%,15/26,P=0.04）.The mean wound healing time was shorter in the CM group（22.71±5.46 days） than in the WM group（26.56±7.56 days,P=0.04）.CM treatment was well tolerated,and there was no withdrawal due to adverse reactions.Immunohistochemical analysis in the refractory wound indicated higher expressions ofβ-catenin,c-myc and K6 compared with the normal skin.β-catenin was abnormally expressed in the nuclei of the keratinocytes and fibroblasts at the wound margins,and the expressions of c-myc and K6 were highly expressed in the full hyperplastic epidermis,especially in the granular layer（P0.05）.The expressions of these proteins decreased after CM treatment.The expression levels ofβ-catenin,c-myc,and K6 proteins before and after the treatment were 101.88±10.76 vs.140.42±8.45;113.27±16.75 vs.153.79±8.32; 90.39±11.07 vs.151.29±7.39,respectively.Conclusions：CM treatment using Hongyou Ointment and Shengji Powder was efficient in the management of diabetic skin ulcers.The mechanism of action might be related to the inhibition of the Wnt signaling pathway.