Abstract：
:Genetically engineered single-chain Fvs (sFv) are defined as recombinant proteins composed of a variable light chain amino acid sequence of an immunoglobulin tethered to a variable heavy chain sequence by a designed peptide. Previous studies using iodine-labeled sFv, derived from the anticarcinoma monoclonal antibody CC49, showed that the 125I-sFv could efficiently target antigen-positive tumors in a human tumor xenograft model while demonstrating rapid plasma clearance and minimal uptake in normal organs. One of the issues we raised in the analysis of the iodinated sFv metabolic studies was whether similar metabolic patterns would be observed if the sFv were labeled with a radiometal. In the studies reported here, 125I-CC49 sFv and 177Lu-CC49 sFv were co-injected in mice bearing antigen-positive carcinoma xenografts. Both sFv forms showed similar tumor targeting and plasma clearance pharmacokinetics. The 177Lu-sFv, however, showed a greater uptake in liver and spleen and a much higher uptake in kidney. These studies thus demonstrate that despite their small size (M(r) 27,000), the metal-chelated sFv shows a metabolic pattern very different than that of the iodinated sFv, which is most likely due to retention of the metal by organs metabolizing the sFv.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Schott ME,Milenic DE,Yokota T,Whitlow M,Wood JF,Fordyce WA,Cheng RC,Schlom Jsubject
Has Abstractpub_date
1992-11-15 00:00:00pages
6413-7issue
22eissn
0008-5472issn
1538-7445journal_volume
52pub_type
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