A Novel Experimental Mouse Model of Peritoneal Dissemination of Human Gastric Cancer Cells: Different Mechanisms in Peritoneal Dissemination and Hematogenous Metastasis

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Abstract
We established a new cell line, AZ‐P7a, with high peritoneal‐metastatic potential in nude mice. AZ‐P7a cells were derived from the human gastric carcinoma line AZ‐521, which has low capacity for peritoneal dissemination. AZ‐P7a cells developed peritoneal metastasis in 11/14 (78.6%) mice, whereas the parental AZ‐521 cells developed metastasis in 2/6 (33.3%) mice. The metastatic foci in the peritoneum showed essentially the same histological appearance as those induced by parental cells. The tumorigenicity and the motile activity of AZ‐P7a cells were stronger than those of the parental AZ‐521 cells; in contrast, adhesion to the extracellular matrix and the production of vascular endothelial growth factor by AZ‐P7a cells were decreased. In fluorescence‐activated cell sorter (FACS) analysis, AZ‐P7a cells expressed significantly greater levels of integrins α2, α3, α5, α6 and αvβ5, as compared with AZ‐521 cells. However, α1, α4, αvβ3, hCD44H, hCD44v3, hCD44v6 and hCD44v10 were not expressed in either cell line. AZ‐P7a cells developed no liver metastasis when administered by the intrasplenic injection method, though the highly liver metastatic cell line AZ‐H5c showed the same rate of peritoneal dissemination as that exhibited by AZ‐P7a cells after intraabdominal injection. These findings suggested that the mechanism of peritoneal dissemination differed from that of hematogenous metastasis. Moreover, the latter appears to be controlled by more complex mechanisms than the former. Thus, this cell line might be useful for investigating the mechanism of peritoneal dissemination of human gastric cancer.

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