Expression and mechanism of PinX1 and telomerase activity in the carcinogenesis of esophageal epithelial cells
Esophageal tissues were collected from an esophageal carcinoma high-risk area of China and were used to detect the telomere length and the expression of human telomerase reverse transcriptase (hTERT) by immuhistochemistry and fluorescence in situ hybridization; esophageal carcinoma
tissues, paired-adjacent mucosa and paired normal mucosa were obtained from resected surgical specimens of esophageal squamous cell carcinoma in order to determine telomerase activity and expression of hTERT and Pin2/TRF1 interacting protein X1 (PinX1) by telomeric repeat amplification
protocolsilver staining, RT-PCR and flow cytometry (FCM). The cell proliferation and apoptosis of Eca109 cells were analyzed by FCM and MTT assay. We found that the length of telomere DNA decreased and hTERT protein expression increased in the carcinogenesis of esophageal epithelial cells;
telomerase activity was significantly upregulated followed by a decrease of PinX1 expression in esophageal carcinoma compared with dysplasia and normal patients, which notably correlated with grade and lymph node metastasis. Overexpression of PinX1 inhibited cell growth, arrested cells at
the G0/G1 stage and induced cell apoptosis in Eca109 cells. In addition, PinX1 overexpression significantly inhibited telomerase activity. In conclusion, the length shortening of telomere was an important characteristic in the carcinogenesis of esophageal epithelial cells, followed by increase
of telomerase activity and downregulation of PinX1. Overexpression of PinX1 blocked Eca109 cell proliferation and induced cell apoptosis by downregulating telomerase activity.
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Document Type: Research Article
Department of Oncology, the Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050012, P.R. China
Department of Dermatology, the Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
Department of Pathology, Shijiazhuang People's Medical College, Shijiazhuang, Hebei 050091, P.R. China
Hebei Cancer Institute, Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China
Publication date: January 1, 2013
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