Abstract |
Human tumor necrosis-alpha (hTNF-alpha) was chemically conjugated to the murine anti-Ly-2.1 T cell antibody using heterobifunctional crosslinking agents SAMSA and SPDP. SDS-PAGE analysis of the affinity purified conjugate consisted mainly of 1:1 and 1:2 (Ly-2.1:TNF) complexes. Conjugated hTNF retained 50% of its cytotoxic activity by the L929 cytolytic assay, with an IC50 = 0.12 ng/ml. hTNF-Ly-2.1 was also cytotoxic to E3 cells (Ly-2.1+ve) with an IC50 = 1.7 microg/ml - 3 times more cytotoxic to these cells than non-conjugated hTNF in vitro. However in vivo hTNF-Ly-2.1 conjugates were more toxic to mice than hTNF. In vivo blood clearance studies in E3 tumor bearing CBF1 mice demonstrated that the half life of the conjugate was 2 hr, compared to 20 min for hTNF. In biodistribution studies, tumor accumulation of 3% was seen for hTNF-Ly-2.1 while for unconjugated hTNF no activity in tumor was detected 24hr post injection. A single dose of hTNF-Ly-2.1 increased the accumulation of 125I-anti-Ly-2.1 by 3 fold compared to controls. However, the antitumor effect of hTNF-Ly-2.1 on E3 cells in vivo was marginal with some tumor growth retardation at day 1-3. The results of these in vitro and in vivo studies on chemically conjugated h-TNF-MoAb will be helpful in the design of novel recombinant fusion proteins for targeting the biologic activity of TNF to tumours.
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Authors | G A Pietersz, B Toohey, I F McKenzie |
Journal | Journal of drug targeting
(J Drug Target)
Vol. 5
Issue 2
Pg. 109-20
( 1998)
ISSN: 1061-186X [Print] England |
PMID | 9588867
(Publication Type: Journal Article)
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Chemical References |
- Antibodies, Monoclonal
- Immunoconjugates
- Recombinant Proteins
- Tumor Necrosis Factor-alpha
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Topics |
- Animals
- Antibodies, Monoclonal
(chemistry)
- Cell Line
- Drug Evaluation
- Half-Life
- Humans
- Immunoconjugates
(administration & dosage, isolation & purification, pharmacokinetics)
- Mice
- Recombinant Proteins
(administration & dosage, pharmacokinetics)
- Thymoma
(metabolism)
- Thymus Neoplasms
(metabolism)
- Tissue Distribution
- Tumor Necrosis Factor-alpha
(chemistry, pharmacokinetics)
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