Abrogation of lung metastasis of human fibrosarcoma cells by ribozyme-mediated suppression of integrin alpha6 subunit expression.
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| Abstract |
The interaction of tumor cells with the basement membrane plays a crucial role in tumor metastasis. VLA-6 (alpha6beta1) integrin is one of the major surface receptors for the basement membrane, specifically recognizing laminin. To study the role of VLA-6 integrin in tumor invasion and metastasis, we synthesized a ribozyme that selectively degrades the integrin alpha6 subunit mRNA. The catalytic activity of the ribozyme was verified by in vitro cleavage of alpha6 subunit mRNA. Introduction of the anti-alpha6 ribozyme gene into the human fibrosarcoma cell line HT1080 yielded stable transfectants, which expressed a significantly reduced level of integrin alpha6 mRNA. Flow cytometric analysis showed that the surface expression of VLA-6, but not other integrins, was reduced by approximately 70% in transfected cells. Ribozyme-transfected cells were less adherent to laminin-coated substrata and less invasive into reconstituted basement membrane than mock-transfected cells. When injected i.v. into nude mice, ribozyme-transfected cells produced no lung metastasis in all except 1 of 35 mice, though mock-transfected cells produced multiple lung metastases in 22 of 29 mice. Our results indicate that VLA-6 integrin plays a critical role in tumor invasion and metastasis and may serve as a potential target for eradication of tumor metastasis in the lung.
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| Authors | H Yamamoto, A Irie, Y Fukushima, T Ohnishi, N Arita, T Hayakawa, K Sekiguchi |
| Journal | International journal of cancer (Int J Cancer) Vol. 65 Issue 4 Pg. 519-24 (Feb 08 1996) ISSN: 0020-7136 [Print] United States |
| PMID | 8621237 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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