Résumé
To study the expression and implication of HIF-la and VEGF-C in non-small cell lung cancer (NSCLC) and its relationship with clinical pathological features of NSCLC, immunohistochemical SP was used to detect the expression of HIF-1а and VEGF-C proteins in 48 NSCLC tissues and the same para-cancerous tissues. The positive rates of HIF-1а and VEGF-C were 70.8% (34/48) and 68.8% (33/48) respectively. The expression of HIF-la protein was detected in a significantly greater proportion in NSCLC carcinoma tissues than that in para-cancerous tissues (12.5% and 16.7%,P<0.05). The positive rates of HIF-1а and VEGF-C were correlated with lymph node metastasis and TNM stage. No relationship was found between the two factors and age, sex, pathological subtypes and histological grades. The positive rates between HIF-1а and VEGF-C were correlated (P<0.05).HIF-1а and VEGF-C were over-expressed in NSCLC. They may be involved in the carcinogenesis of NSCLC, and play an important role in invasion and metastasis of NSCLC. HIF-1а and VEGF-C work synergically in the process of NSCLC.
Résumé
In order to study the effects of ethyl pyruvate on cardiomyocyte apoptosis following ischemia/reperfusion (I/R) in vitro and the expression of Bcl-2 and Bax proteins, isolated rat hearts were perfused in a Langendorff model. Twenty-four rats were randomly divided into 3 groups (n=8 in each group): control group was perfused for 120min. In the I/R group, after 30min stabilization the injury was induced by 30min global ischemia followed by 60min reperfusion. Ethyl pyruvate (EP) group was set up with the same protocol as I/R group except that it was supplied with 2mmol/L EP 15min before ischemia and throughout reperfusion. Myocardial malonaldehyde (MDA) content Was measured. Myocardial apoptotic index (AI) was tested by terminal deoxynucleotidyl transferase mediated dUTP nick end labeling (TUNEL) method. The expression of anti-apoptotic protein Bcl-2 and pro-apoptotic protein Bax in cardiac myocytes was detected by immunohistochemistry. As compared with control group, the content of MDA, myocardial AI and the expression of Bcl-2, Bax proteins were increased significantly in I/R group, but the content of MDA, myocardial AI and the expression of Bax protein were decreased obviously and the expression of Bcl-2 protein was up-regulated in EP group (P<0.05). These results demonstrate that EP could inhibit apoptosis of cardiac myocytes possibly via alleviating oxidative stress, up-regulating Bcl-2 and down-regulating Bax proteins.