Résumé
The development of chemoresistance which results in a poor prognosis often renders current treatments for colorectal cancer(CRC).In this study,we identified reduced microvessel density(MVD)and vascular immaturity resulting from endothelial apoptosis as therapeutic targets for overcoming chemoresistance.We focused on the effect of metformin on MVD,vascular maturity,and endothelial apoptosis of CRCs with a non-angiogenic phenotype,and further investigated its effect in overcoming chemoresistance.In situ transplanted cancer models were established to compare MVD,endothelial apoptosis and vascular maturity,and function in tumors from metformin-and vehicle-treated mice.An in vitro co-culture system was used to observe the effects of metformin on tumor cell-induced endothelial apoptosis.Transcriptome sequencing was performed for genetic screening.Non-angiogenic CRC developed inde-pendently of angiogenesis and was characterized by vascular leakage,immaturity,reduced MVD,and non-hypoxia.This phenomenon had also been observed in human CRC.Furthermore,non-angiogenic CRCs showed a worse response to chemotherapeutic drugs in vivo than in vitro.By suppressing endo-thelial apoptosis,metformin sensitized non-angiogenic CRCs to chemo-drugs via elevation of MVD and improvement of vascular maturity.Further results showed that endothelial apoptosis was induced by tumor cells via activation of caspase signaling,which was abrogated by metformin administration.These findings provide pre-clinical evidence for the involvement of endothelial apoptosis and subsequent vascular immaturity in the chemoresistance of non-angiogenic CRC.By suppressing endothelial apoptosis,metformin restores vascular maturity and function and sensitizes CRC to chemotherapeutic drugs via a vascular mechanism.
Résumé
Iatrogenic femoral artery pseudoaneurysm caused by invasive procedures is one of the common complications for endovascular interventions. We present a case of a young male with a complex iatrogenic femoral artery pseudoaneurysm as a result of iatrogenic femoral artery puncture. The defective femoral artery was repaired with combined bovine pericardial tube and autologous great saphenous vein grafts. Computed tomography angiography showed the grafts were still patent one year after the surgery.
Résumé
<p><b>OBJECTIVE</b>To establish a strain of human cervical carcinoma cell line and to provide a cervical carcinoma animal model.</p><p><b>METHODS</b>The cervical carcinoma specimens incised aseptically were cultured in vitro by tissue culture methods, giving a tumor cell growth curve. Morphology of the cells was observed, with cell cycling analysis and chromosome analysis performed. The tumor markers (ER, PR, Keratine, PCNA) expressions of the cell line were detected by immuno-cytochemical technique.</p><p><b>RESULTS</b>A human cervical carcinoma cell line HCC-0214 (H) has been obtained by in vitro tissue culture methods. The cells have been maintained for 16 months through 131 passages, showing a stable growth with a population doubling time of 35.48 h and a tendency to pile up without contact inhibition. The ultrastructure showed typical desmosomes and numerous tonofilaments. Chromosome analysis revealed the number of chromosomes per cell varied from 35-156 with a stem-line number of 58-80 (64.8%). The morphology of chromosomes showed human tumor cell structure. The tumor markers (ER, PR, Keratine, PCNA) of the cells showed a high expression. The DNA index was 1.931 by flow cytometry (FCM). The histopathology of the transplanted tumors in nude mice was the same as the original tumor, though with none successful by serum culture.</p><p><b>CONCLUSION</b>A human cervical carcinoma cell line HCC-0214 established by tissue culture is identical to the primary cancer cell in biological characters. After the cells have been passaged for more than 16 months continually, their characteristics are still retained. Therefore, HCC-0214 may be used as a stable cell line.</p>