title: Two doses of humanized anti-CD25 antibody in renal transplantation: a preliminary comparative study.
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.
authors.affiliation: International Joint Cancer Institute and Changhai Hospital Cancer Center, the Second Military Medical University, Shanghai, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Xinyan
authors.initials: X
authors.lastname: Li
authors.forename: Min
authors.initials: M
authors.lastname: Tan
authors.forename: Birong
authors.initials: B
authors.lastname: Lin
authors.forename: Sheng
authors.initials: S
authors.lastname: Hou
authors.forename: Weizhu
authors.initials: W
authors.lastname: Qian
authors.forename: Bohua
authors.initials: B
authors.lastname: Li
authors.forename: Dapeng
authors.initials: D
authors.lastname: Zhang
authors.forename: Bo
authors.initials: B
authors.lastname: Zhou
authors.forename: Hao
authors.initials: H
authors.lastname: Wang
authors.forename: Tongyu
authors.initials: T
authors.lastname: Zhu
authors.forename: Yajun
authors.initials: Y
authors.lastname: Guo
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D000911:Antibodies, Monoclonal / Q000008:administration & dosage / Q000276:immunology / Q000493:pharmacokinetics*; D061067:Antibodies, Monoclonal, Humanized; D045744:Cell Line, Tumor; D006224:Cricetinae; D000077561:Daclizumab; D004334:Drug Administration Schedule; D005260:Female; D006084:Graft Rejection / Q000097:blood / Q000276:immunology / Q000517:prevention & control*; D006801:Humans; D007074:Immunoglobulin G / Q000008:administration & dosage / Q000276:immunology; D007166:Immunosuppressive Agents / Q000008:administration & dosage / Q000276:immunology / Q000493:pharmacokinetics*; D007275:Injections, Intravenous; D053645:Interleukin-2 Receptor alpha Subunit / Q000276:immunology*; D016030:Kidney Transplantation; D018655:Lymphocyte Count; D008297:Male; D051379:Mice; D008875:Middle Aged; D013601:T-Lymphocytes / Q000276:immunology; D055815:Young Adult
chemical_list: D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D007074:Immunoglobulin G; D007166:Immunosuppressive Agents; D053645:Interleukin-2 Receptor alpha Subunit; D000077561:Daclizumab