This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Wang, Z. Articles by Tennvall, J. Search for Related Content PubMed PubMed Citation Articles by Wang, Z. Articles by Tennvall, J.

Blood Pharmacokinetics of Various Monoclonal Antibodies Labeled with a New Trifunctional Chelating Reagent for Simultaneous Conjugation with 1,4,7,10-Tetraazacyclododecane-N,N',N'',N'''-Tetraacetic Acid and Biotin before Radiolabeling

Authors' Affiliations: ¹ Department of Oncology, Lund University Hospital; Departments of ² Radiation Physics and ³ Tumor Immunology, Lund University; ⁴ Mitra Medical AB, Lund, Sweden; and ⁵ Shanxi Tumor Hospital and Shanxi Tumor Radiotherapy Center, Shanxi, P.R. China

Requests for reprints: Jan Tennvall, Department of Oncology, Lund University Hospital, SE-221 85 Lund, Sweden. Phone: 46-4617-7520; Fax: 46-4617-6080; E-mail: Jan.Tennvall{at}onk.lu.se.

Purpose: Knowledge of the blood pharmacokinetics of monoclonal antibodies is crucial in deciding the optimal time for starting the administration of a "clearing agent" or using a "clearing device." The primary purpose was to investigate whether the pharmacokinetics of various antibodies labeled with the same chelator and ¹¹¹In differed significantly after i.v. injection in immunocompetent rats. A new trifunctional chelator called "1033" containing a biotin and a radiometal chelation moiety is introduced, making it possible to use only one conjugation procedure for the antibody.

Experimental Design: Sixty-five non–tumor-bearing rats were included and divided into four groups (I-IV). The blood pharmacokinetics was investigated for rituximab, BR96, and trastuzumab labeled with 1033 and ¹¹¹In (I-III). The whole-body activity and activity uptake in muscle, liver, and kidney, which might explain differences in the early pharmacokinetics in blood, were also measured. hMN14 labeled with another chelator [1,4,7,10-tetraazacyclododecane-N,N',N'',N'''-tetraacetic acid (DOTA)], but with the same radionuclide (¹¹¹In-biotin-DOTA-hMN14), was studied (IV). The blood pharmacokinetics from another 15 tumor-bearing rats was compared with those of non–tumor-bearing rats (III) by injection of ¹¹¹In-1033-BR96.

Results: No statistical difference was detected between the groups regarding the blood pharmacokinetics of rituximab, BR96, or trastuzumab. The pharmacokinetics and biodistribution of ¹¹¹In-biotin-DOTA-hMN14 exhibited a clear difference compared with others. There were no significant differences in the blood pharmacokinetics of ¹¹¹In-1033-BR96 between tumor-bearing rats and non–tumor-bearing rats.

Conclusions: Different antibodies labeled with the trifunctional chelator 1033 and ¹¹¹In did not exhibit different blood pharmacokinetics, which means that the pharmacokinetics could be predicted irrespective of the IgG1 antibody chosen. A small tumor burden did not change the pharmacokinetics of the radioimmunoconjugates.

This article has been cited by other articles:

				L. Martensson, R. Nilsson, T. Ohlsson, H.-O. Sjogren, S.-E. Strand, and J. Tennvall Reduced Myelotoxicity with Sustained Tumor Concentration of Radioimmunoconjugates in Rats after Extracorporeal Depletion J. Nucl. Med., February 1, 2007; 48(2): 269 - 276. [Abstract] [Full Text] [PDF]