tumor cells express fcγrl which contributes to tumor cell growth and a metastatic phenotype
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ID: 191377
2001
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Abstract
High levels of circulating immune complexes containing tumor-associated antigens are associated with a poor prognosis for individuals with cancer. The ability of B cells, previously exposed to tumor-associated antigens, to promote both in vitro and in vivo tumor growth formed the rationale to evaluate the mechanism by which immune complexes may promote tumor growth. In elucidating this mechanism, FcγRl expression by tumor cells was characterized by flow cytometry, polymerase chain reaction, and sequence analysis. Immune complexes containing shed tumor antigen and anti-shed tumor antigen Ab cross-linked FcγRl-expressing tumor cells, which resulted in an induction of tumor cell proliferation and of shed tumor antigen production. Use of selective tyrosine kinase inhibitors demonstrated that tumor cell proliferation induced by immune complex cross-linking of FcγRl is dependent on the tyrosine kinase signal transduction pathway. A selective inhibitor of phosphatidylinositol-3 kinase also inhibited this induction of tumor cell proliferation. These findings support a role for immune complexes and FcγRl expression by tumor cells in augmentation of tumor growth and a metastatic phenotype.
| Reference Key |
nelson2001neoplasia:tumor
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|---|---|
| Authors | ;M. Bud Nelson;Julie K. Nyhus;Katherine I. Oravecz-Wilson;Emilio Barbera-Guillem |
| Journal | ACS chemical neuroscience |
| Year | 2001 |
| DOI |
10.1038/sj.neo.7900140
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| URL | |
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