RESUMO
Objective To study the effect of adeno associated virus hepatocyte growth factor K1(AAV‐HGFK1)on the prolifer‐ation of 4 different colorectal cell lines with or without KRAS or BRAF mutation .Methods The levels of epidermal growth factor receptor (EGFR) mRNA were determined in SW48 without KRAS or BRAF mutation ,Lovo with KRAS mutation ,SW620 with KRAS mutation ,HT29 with BRAF mutation by quantitative real time PCR ,respectively .After the infection of AAV‐HGFK1 ,the expressions of EGFR ,p‐EGFR and β‐actin were detected by Western blot and the proliferation of the cells were assayed using MTT .Results Lovo ,SW48 and HT29 expressed EGFR protein while SW620 did not .EGF promoted the proliferation of Lovo , SW48 and HT29 cells .AAV‐HGFK1 down‐regulated the phosphorylation of EGFR and significantly inhibited their proliferation . But EGF had no effect on proliferation of SW620 stimulated by EGF .Conclusion AAV‐HGFK1 exhibited its antitumor effects through EGF/EGFR signaling irrespective of the KRAS or BRAF mutation and may also act through other signaling pathways .
RESUMO
<p><b>OBJECTIVE</b>To establish hepatic metastasis models of two colorectal carcinoma cell lines in mice for studying mechanism involved in colorectal carcinoma metastasis and its potential countermeasures.</p><p><b>METHODS</b>Murine and human colorectal carcinoma CT26 and LoVo cells were inoculated into the spleen of Balb/c mice and Balb/c nude mice, respectively. The conditions of all the mice were observed, and the survival time and liver metastases were recorded.</p><p><b>RESULTS</b>All mice inoculated with CT26 cells and a few with LoVo cells developed liver metastases without metastases in any other organs. Pathological examination identified the liver metastatic foci as poorly differentiated colonic adenocarcinoma. Compared with the mice inoculated with LoVo cells, those with CT26 cells had a higher rate of liver metastasis and a shorter survival time.</p><p><b>CONCLUSION</b>The mouse model has been established successfully, which well mimics the pathological process of liver metastasis of colorectal cancer.</p>