Telomerase activity and human telomerase reverse transcriptase expression in colorectal carcinoma.
OBJECTIVE
To study the activity of telomerase and the expression of human telomerase reverse transcriptase (hTERT) in colorectal carcinoma and its adjacent tissues, normal mucosa and adenomatoid polyp, and to evaluate their relation with carcinogenesis and progression of colorectal carcinoma.


METHODS
Telomerase activity and hTERT expression were determined in 30 samples of colorectal carcinoma and its adjacent tissues, normal mucosa and 20 samples of adenomatoid polyp by modified telomeric repeat amplification protocol (TRAP), enzyme-linked immunosorbent assay (ELISA) and immunohistochemical method.


RESULTS
Telomerase activity and hTERT expression were 83.33% (25/30) and 76.67% (23/30) respectively in colorectal carcinoma, which were obviously higher than those in paracancerous tissues (13.33%, 16.67%), normal mucosa (3.33%, 3.33%) and adenomatoid polyp (10%, 10%). There was a significant difference between colorectal carcinoma and other tissues (P=0.027). The telomerase activity and hTERT expression were higher in colorectal carcinoma with lymphatic metastasis than in that without lymphatic metastasis (P=0.034). When the histological classification and clinical stage were greater, the telomerase activity and hTERT expression increased, but there was no significant difference between them. In colorectal carcinoma, the telomerase activity was correlated with hTERT expression (positive vs negative expression of telomerase activity and hTERT, P=0.021).


CONCLUSIONS
Telomerase activity is closely correlated with the occurrence, development and metastasis of colorectal carcinoma. Overexpression of hTERT may play a critical role in the regulation of telomerase activity.
Liu
Jian-Lun
JL
Department of Gastrointestinal and Breast Surgery, the Affiliated Cancer Hospital of Guangxi Medical University, Nanning 530021, Guangxi Zhuang Autonomous Region, China. jianlun@public.nn.gx.cn
Ge
Lian-Ying
LY
Zhang
Gui-Nian
GN
D002277:Carcinoma / Q000201:enzymology* / Q000473:pathology; D015179:Colorectal Neoplasms / Q000201:enzymology* / Q000473:pathology; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D007413:Intestinal Mucosa / Q000201:enzymology / Q000473:pathology; D009362:Neoplasm Metastasis; D009367:Neoplasm Staging; D013223:Statistics as Topic; D019098:Telomerase / Q000235:genetics / Q000378:metabolism*
D004268:DNA-Binding Proteins; D019098:Telomerase