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Departments of Surgery [L. L, P. B.] and Oncology [P. B.], McGill University and the Royal Victoria Hospital [P. B.], Montreal, Quebec, Canada H3A 1A4; and Department of Pathology and Cell Biology, Jefferson Medical College [R. R.], and Jefferson Cancer Institute [R. B.], Thomas Jefferson University, Philadelphia, Pennsylvania 19107
The ability of malignant cells to form metastases in secondary sites remains a major obstacle to the curative treatment of cancer. Previously, we identified type 1 insulin-like growth factor (IGF-1) as a paracrine mitogen for highly metastatic murine carcinoma, H-59 cells. Here the role of IGF-1 and its receptor (IGF-1R) in metastasis was further investigated using H-59 cells transfected with a plasmid vector expressing IGF-1R cDNA in the antisense orientation. The transfectants had a markedly reduced expression of IGF-1R and lost the ability to respond to IGF-1 in vitro. When injected in vivo, either directly into the microvasculature of the liver or lung (experimental metastasis) or s.c. to allow the growth of primary local tumors (spontaneous metastasis), these cells did not give rise to any metastases under conditions which allowed wild-type or control transfectants to form multiple hepatic and pulmonary metastases. The results demonstrate that the IGF-1R can play a critical role in the regulation of carcinoma metastasis.
1 This work was supported by a grant from the Medical Research Council of Canada (to P. B.) and also by NIH Grants AA-0123 and AA-07309 (to R. R.) and CA-53484 (to R. B.)
2 To whom requests for reprints should be addressed.
Received 12/20/94. Accepted 1/19/95.
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