Novel enhanced lung-colonizing variant of murine MBT-2 bladder cancer cells.
OBJECTIVE
To develop an enhanced lung-colonizing variant of murine bladder cancer that will allow the mechanism of metastasis to be studied more readily.


METHODS
We implanted murine bladder tumor cells (MBT-2) into the leg muscles of C3H mice. We developed variant cells from a lung metastasis nodule. We compared the MBT-2 cells and variant cells (MBT-2V) in vivo by evaluating lung nodule formation, survival, in vitro adhesion, and migration-invasion assays. Zymography and semiquantitative reverse transcriptase-polymerase chain reaction analyses were also performed to characterize the metastatic ability of both cells.


RESULTS
MBT-2 and MBT-2V cells were tumorigenic when injected intramuscularly into C3H mice, but MBT-2 cells had little potential to metastasize compared with MBT-2V cells. Metastases were observed in the lungs of mice injected in the tail vein with MBT-2 and MBT-2V cells. Mice receiving MBT-2V cells had significantly shorter survival (P <0.01) and more lung nodules (245 versus 106, P <0.0001) than those receiving MBT-2 cells. In vitro study revealed that MBT-2V cells exhibited more adhesion, greater migration, and more invasiveness than did MBT-2 cells. Pathologic examination revealed the tumors from MBT-2V cells to be more aggressive than those from MBT-2 cells. MBT-2V also showed significantly greater matrix metalloproteinase-9 expression.


CONCLUSIONS
We generated an enhanced lung-colonizing variant of MBT-2 cells. Our MBT-2V cells showed more aggressive and invasive metastatic ability than that of the MBT-2 cells. Zymography and reverse transcriptase-polymerase chain reaction analyses indicated that matrix metalloproteinase-9 might be associated with the metastatic ability of MBT-2V cells.
Horinaga
Minoru
M
Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA. m5508985@ra2.so-net.ne.jp
Fukuyama
Ryuichi
R
Nishiyama
Toru
T
Harsch
Kelley M
KM
Cicek
Muzaffer
M
Heston
Warren
W
Sizemore
Nywana
N
Casey
Graham
G
Larchian
William
W
D000818:Animals; D045744:Cell Line, Tumor; D004195:Disease Models, Animal; D005260:Female; D008175:Lung Neoplasms / Q000556:secondary*; D051379:Mice; D009374:Neoplasms, Experimental / Q000556:secondary*; D001749:Urinary Bladder Neoplasms / Q000473:pathology*