[Effect of Tiam1 overexpression on proliferation and metastatic potential of human colorectal cancer].
OBJECTIVE
To confirm the role of Tiam1 (T lymphoma invasion and metastasis 1) gene in the proliferation and metastasis of colorectal cancer.


METHODS
Proliferative and metastatic abilities of Tiam1 transfectant were investigated by subcutaneous injection of cells and surgical orthotopic transplantation (SOI) in mice.


RESULTS
The expression of Tiam1 led to a pronounced increase in HT29/Tiam1 cell growth starting from day 7, up to 2.5 fold increase of tumor volume at day 20 post injection. Tumors in the HT29/Tiam1 group receiving surgical orthotopic implantation were significantly heavier than those in HT29/mock group (t = -14.916, P < 0.01). In vivo metastasis assay by SOI showed that in HT29/Tiam1 group, 7/7 of mice developed peritoneal metastases and 4/7 had hepatic lesions. In addition, one of the seven HT29/Tiam1 group mice had tumors in lung, spleen and lymph nodes. In the HT29/mock group, only 2/7 of animals had peritoneal metastases and none produced detectable tumor in the liver.


CONCLUSIONS
Tiam1 gene plays an important role in the proliferation, invasion and metastasis of colorectal cancer. It may serve as a useful clinical marker for tumor progression and metastasis of colorectal cancer.
Liu
Li
L
Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
Xu
An-gao
AG
Zhang
Qing-ling
QL
Zhang
Yan-fei
YF
Ding
Yan-qing
YQ
D000818:Animals; D014408:Biomarkers, Tumor / Q000032:analysis; D049109:Cell Proliferation; D015179:Colorectal Neoplasms / Q000473:pathology*; D020662:Guanine Nucleotide Exchange Factors / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D019073:HT29 Cells; D006801:Humans; D008113:Liver Neoplasms / Q000556:secondary; D008175:Lung Neoplasms / Q000556:secondary; D008207:Lymphatic Metastasis; D051379:Mice; D008819:Mice, Nude; D009361:Neoplasm Invasiveness; D009368:Neoplasm Transplantation; D010534:Peritoneal Neoplasms / Q000556:secondary*; D010957:Plasmids; D000075684:T-Lymphoma Invasion and Metastasis-inducing Protein 1; D014162:Transfection; D047368:Tumor Burden