Abstract:
BACKGROUND & AIMS:Because alterations of integrin expression in cancers contribute to cancer cell biology, we analyzed the association between the potential for peritoneal dissemination and integrin expression. METHODS:The dissemination potential of 10 human gastric cancer cell lines in mice with severe combined immunodeficiency (SCID) was compared with the expression of various integrins. The relationship between integrin expression and peritoneal dissemination was also investigated in surgically resected gastric cancer cases. RESULTS:The level of integrin beta4 subunit expression was inversely correlated with dissemination potential. Introduction of a full-length complementary DNA (cDNA) for beta4 subunit into cancer cells showing negligible beta4 subunit expression markedly suppressed peritoneal dissemination and inhibition of endogenous integrin alpha6beta4 by introduction of a cytoplasmic domain-deleted beta4 subunit cDNA into cells showing high expression of beta4 subunit promoted peritoneal dissemination. Apoptosis, which was histologically evident in peritoneal nodules of SCID mice, was induced in the cells with high beta4 subunit expression by attachment to laminin and stimulation with growth factors in vitro. An immunohistochemical study of specimens from 120 cases of primary gastric cancer showed that patients with beta4 subunit-positive tumors exhibited peritoneal dissemination only infrequently (P < 0.0001) and had a better outcome (P < 0.01). CONCLUSIONS:These results indicate that integrin alpha6beta4 is both a suppressor and a predictive marker for peritoneal dissemination in gastric cancer.
journal_name
Gastroenterologyjournal_title
Gastroenterologyauthors
Ishii Y,Ochiai A,Yamada T,Akimoto S,Yanagihara K,Kitajima M,Hirohashi Sdoi
10.1016/s0016-5085(00)70255-1keywords:
subject
Has Abstractpub_date
2000-03-01 00:00:00pages
497-506issue
3eissn
0016-5085issn
1528-0012pii
S0016508500566505journal_volume
118pub_type
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