[Characterization of telomerase regulation association gene TRAP and cancer biology].
OBJECTIVE
To investigate expression of TRAP in human tumors and correlativity between TRAP and hTERT and to explore the role of TRAP in tumorigenesis.


METHODS
TRAP was expressed in E. coli. and polyclonal antibody was prepared by immunization of New Zealand rabbits. Expressions of TRAP gene and hTERT in human tumors were analyzed by immunohistochemistry. The eukaryotic expression vectors of TRAP were constructed and transferred stably into HeLa cells to be analysed with Northern blot, TRAP-PCR ELISA, growth curve, nude mouse transplantation.


RESULTS
Polyclonal antibody was obtained from New Zealand rabbits immunized with TRAP fuse protein, which was inducibly expressed in E. coli., and its specificity was verified in Western blot. TRAP staining was detected in 213 (86.2%) of 247 malignant tumors. On the contrary, TRAP in all tissues adjacent to tumors was negative. There is a obvious difference between borderline, pre-cancerous and benign lesion in the expression of TRAP. Furthermore, hTERT staining was conducted and its result was consistent with that of TRAP. Up-regulation and down-regulation of hTERT expression and telomerase activity were observed respectively in HeLa cells transfected stably with sense and antisence TRAP recombination. Increased proliferation presented in the former and growth inhibition in the latter. Besides, in nude mice, tumorigenecity of sense TRAP-transfected HeLa cells was enhanced while tumor growth of antisense TRAP-transfected HeLa cells was retarded.


CONCLUSIONS
The expression of TRAP, which could be detected in most of human cancers and part of pre-cancerous lesions, was correlated with expression of hTERT. The status of TRAP expression could regulate telomerase activity and present effects on growth and tumorigeneity of cancer cells. This suggests that TRAP is involved in human tumorigenesis through regulation of telermarase activity.
Tang
Zhiwei
Z
Department of General Surgery, Peking University First Hospital, Beijing 100034, China.
Zhang
Bo
B
Xu
Wenhuai
W
Zhao
Yuanjun
Y
Hou
Lin
L
D000135:Acid Phosphatase / Q000235:genetics*; D000818:Animals; D015536:Down-Regulation; D004926:Escherichia coli; D006367:HeLa Cells; D006801:Humans; D007527:Isoenzymes / Q000235:genetics*; D051379:Mice; D008819:Mice, Nude; D011817:Rabbits; D000071681:Tartrate-Resistant Acid Phosphatase; D019098:Telomerase / Q000235:genetics*; D014162:Transfection; D015854:Up-Regulation
D007527:Isoenzymes; D019098:Telomerase; D000135:Acid Phosphatase; C000605511:Acp5 protein, mouse; D000071681:Tartrate-Resistant Acid Phosphatase