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http://ir.cmu.edu.tw/ir/handle/310903500/30312
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| 題名: | Naltrexone protects against hypotension, hyperthermia, and ss-endorphin overproduction during heatstroke in the rat |
| 作者: | Huang, YP;Lin, MT;Chen, JS;Wu, PY |
| 貢獻者: | 醫學院醫研所;Chi Mei Med Ctr, Dept Med Res, Tainan 710, Taiwan;China Med Univ, Inst Med Sci, Taichung 402, Taiwan |
| 日期: | 2005 |
| 上傳時間: | 2010-09-24 14:53:02 (UTC+8) |
| 出版者: | JAPANESE PHARMACOLOGICAL SOC |
| 摘要: | The development of endometrial carcinoma (EC) is a multiple-step process, which includes inactivation of tumour suppressor genes, activation of oncogenes, and disturbance of cancer-related genes. Recent studies have shown that the circadian cycle may influence cancer development and prognosis. In this study, the expression of a circadian gene, PER1, was examined in 35 ECs and paired non-tumour tissues by real-time quantitative reverse transcription-polymerase chain reaction (RT-PCR) and immunohistochemistry. Expression levels of PER1 were significantly decreased in EC, and mutational analysis of the coding regions, together with methylation analysis of cytosine-phosphate guanosine (CpG) sites in the promoter area, was performed to investigate the possible mechanisms. The analyses detected four single nucleotide polymorphisms in both tumour and non-tumour tissues, which had no relationship with the expression of PER1. In the promoter area of the PER1 gene, the CpG sites were methylated in 31.4% of ECs, but in 11.4% of paired non-tumour tissues (p < 0.05). These results suggest that the down-regulation of PER1 expression in EC was partly due to inactivation of the PER1 gene by DNA methylation of the promoter and partly due to other factors. Analysis of the relationships between the expression of PER1, P53, c-MYC, cyclin A, cyclin B, and cyclin D1 showed no definite relationship. These results suggest that down-regulation of the PER1 gene disrupts the circadian rhythm, which may favour the survival of endometrial cancer cells. Copyright (c) 2005 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd. |
| 關聯: | JOURNAL OF PHARMACOLOGICAL SCIENCES 97(4):519-524 |
| 顯示於類別: | [醫學研究所] 期刊論文
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