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- Title
Tumor targeting carboxylesterase fused with anti-CEA scFv improve the anticancer effect with a less toxic dose of irinotecan.
- Authors
Uchino, J.; Takayama, K.; Harada, A.; Sone, T.; Harada, T.; Curiel, D. T.; Kuroki, M.; Nakanishi, Y.
- Abstract
Irinotecan (CPT-11) is a key drug for the treatment of various cancers. CPT-11 can be considered to be a prodrug, since it needs to be activated into the toxic drug SN-38 by the enzyme carboxylesterase. However, CPT-11 may induce severe diarrhea and bone marrow suppression as adverse effects, thus leading to treatment interruption. The tumor-specific activation of CPT-11 is a possible strategy to avoid the severe toxicities by reducing the serum concentration of CPT-11. In this study, we constructed human liver carboxylesterase-2 fused with anticarcinoembryonic antigen (CEA) scFv as a targeting molecule. The recombinant enzyme anchors onto the tumor cell surface CEA, and thus metabolize CPT-11 extracellularly. In addition a secreted tumor-targeted form of carboxylesterase should help prevent the leakage of the enzyme from the site of the tumor into the circulation. This fusion protein showed CPT-11 activation to SN-38 and specific binding to CEA-expressing cells. In combination with CPT-11, the recombinant carboxylesterase protein exerted antiproliferative effects on human cancer cells. This recombinant enzyme is, therefore, a promising new tool in enzyme prodrug therapy for the treatment of carcinoma with CPT-11.Cancer Gene Therapy (2008) 15, 94–100; doi:10.1038/sj.cgt.7701100; published online 21 December 2007
- Subjects
ANTINEOPLASTIC agents; TUMORS; FUSION (Phase transformation); PROTEINS; ENZYMES
- Publication
Cancer Gene Therapy, 2008, Vol 15, Issue 2, p94
- ISSN
0929-1903
- Publication type
Article
- DOI
10.1038/sj.cgt.7701100