Comparison of telomerase, p53 and Ki-67 expression on colorectal serrated adenoma, traditional adenoma and colorectal cancer / 中国癌症杂志

Background and purpose:Colorectal serrated adenoma (SA) was ofifcially named in 2000 by the WHO as a separate disease, with unique properties compared with traditional adenoma (TA), and its relationship with colorectal cancer (CRC) is very concerned. This study was to analyze and compare the telomerase, p53 and Ki-67 immunohistochemical expression on the tissues of SA, TA and CRC. Methods:Immunohistochemistry was adopted to analyze the expression of telomerase, p53, and Ki-67 in 37 cases of SA, 36 cases of TA and 34 cases of CRC. Results:The p53-positive percentage of SA was signiifcantly lower than that of TA (P<0.01), and the p53-positive percentage of TA was signiifcantly lower than that of CRC (P<0.01). No signiifcant difference of Ki-67 expression was found between SA and TA, and the Ki-67-positive percentage of SA and TA was lower than that of CRC (P<0.01). The telomerase-positive percentage of TA was signiifcantly lower than that of SA (P<0.01), and the telomerase-positive percentage of SA was signiifcantly lower than that of CRC (P<0.05). Conclusion:Telomerase, P53, and Ki-67 immunohisto chemical analysis indicated that SA is a kind of proliferative adenoma, and telomerase activation may play a role in the cancer process.

Establishment of a nude mouse model of nasopharyngeal carcinoma lymph node metastasis and screening of the metastasis-related signature genes / 南方医科大学学报

<p><b>OBJECTIVE</b>To establish a nude mouse model of nasopharyngeal carcinoma (NPC) lymph node metastasis and screen the signature genes associated with the metastasis.</p><p><b>METHODS</b>The NPC 5-8F-EGFP cells were inoculated into nude mice, from which a 5-8F-LN cell line with lymph node metastasis potential was obtained. The lymphatic metastasis-related signature genes of breast cancer and head and neck squamous cell carcinoma were screened by data mining method.</p><p><b>RESULTS</b>The NPC cell lines 5-8F and 6-10B showed 307 differentially expressed genes by microarray analysis, from which 20 overlapping genes were identified, and 3 overexpressed genes were found with probable metastasis potential, namely the ADM, IRF1, and CAV1 genes. Quantitative RT-PCR validated the data mining results in the 5-8F-EGFP, 6-10B-EGFP, NP69, and 5-8F-LN cell lines. The 3 NPC cell lines 5-8F-EGFP, 6-10B-EGFP and 5-8F-LN showed significantly higher expressions of IRF1 than NP69 cells (P=0.008, 0.022, and 0.006, respectively. The expression level of CAV1 in 5-8F-EGFP cells was significantly higher than that in 6-10B-EGFP cells (P=0.014), but ADM expression showed no significant difference between the 4 cell lines.</p><p><b>CONCLUSIONS</b>IRF1 may play an important role in the progression of NPC. The overexpression of CAV1 in 5-8F-EGFP cells can be associated with the high metastatic potential of the cells.</p>