Two doses of humanized anti-CD25 antibody in renal transplantation: A preliminary comparative study |
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| Authors: | Jing Li Xinyan Li Min Tan Birong Lin Sheng Hou Weizhu Qian Bohua Li Dapeng Zhang Bo Zhou Hao Wang Tongyu Zhu Yajun Guo |
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| Affiliation: | 1.International Joint Cancer Institute and Changhai Hospital Cancer Center; the Second Military Medical University; Shanghai, China;2.Shanghai Key Laboratory of Cell Engineering and Shanghai National Engineering Research Center for Antibody Medicine; Shanghai, China;3.Department of Organ Transplantation; Shanghai Zhongshan Hospital; Fudan University; Shanghai, China |
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| Abstract: | HuCD25mAb is a humanized anti-CD25 antibody which has the same amino acid sequence as daclizumab (Zenapax, Roche). HuCD25mAb is expressed in Chinese hamster ovary (CHO) cells while daclizumab is expressed in the NSO myeloma cell line. A comparative study was performed to evaluate the pharmacokinetics and pharmacodynamics between huCD25mAb and daclizumab in a two-dose regimen incorporating triple immunosuppressant treatment regimens (MMF, CsA and steroids). Fifteen patients were enrolled and randomized to receive intravenous infusion of either huCD25mAb (n = 10) or daclizumab (n = 5) at a dosage of 1 mg·kg−1 on operation day 0 and post-operation day 14. Serum concentrations of huCD25mAb and daclizumab were measured by a validated competitive ELISA. Subgroups of CD3+, CD25+, CD4+ and CD8+ lymphocytes were monitored periodically by flow cytometry. The concentration-time curves of huCD25mAb and daclizumab were found to fit well to a one-compartment model. A significant decline of proportion (%) of CD3-CD25+ and CD3+CD25+ lymphocytes was observed 30 min after first infusion on day 0 (3.40 ± 1.83 to 0.03 ± 0.07, 3.35 ± 2.02 to 0.37 ± 0.49), and these levels remained low for at least 70 days (0.03 ± 0.05, 0.31 ± 0.47). All pharmacokinetic parameters of huCD25mAb seemed similar to those of daclizumab. The two-dose huCD25mAb regimen was as effective as daclizumab in rapidly achieving high therapeutic concentration in the treated patients, and a significant decrease of CD3−CD25+ and CD3+CD25+ lymphocytes was demonstrated. This suggests that two-dose regimen is feasible in maintaining host immunosuppression and may provide an effective and economical strategy for reducing incidence of acute graft rejection.Key words: CD25, pharmacokinetics, kidney transplantation, enzyme immunoassay, flow cytometry, monoclonal antibody |
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