The AAPS Journal

, Volume 14, Issue 2, pp 252–261 | Cite as

Pharmacokinetics, Lymph Node Uptake, and Mechanistic PK Model of Near-Infrared Dye-Labeled Bevacizumab After IV and SC Administration in Mice

  • Fang Wu
  • Mitalee Tamhane
  • Marilyn E. Morris
Research Article


Our objective was to determine the pharmacokinetics, bioavailability and lymph node uptake of the monoclonal antibody bevacizumab, labeled with the near-infrared (IR) dye 800CW, after intravenous (IV) and subcutaneous (SC) administration in mice. Fluorescence imaging and enzyme-linked immunosorbent assay (ELISA) assays were developed and validated to measure the concentration of bevacizumab in plasma. The bevacizumab–IRDye conjugate remained predominantly intact in plasma and in lymph node homogenate samples over a 24-h period, as determined by sodium dodecyl sulfate polyacrylamide gel electrophoresis and size exclusion chromatography. The plasma concentration vs. time plots obtained by fluorescence and ELISA measurements were similar; however, unlike ELISA, fluorescent imaging was only able to quantitate concentrations for 24 h after administration. At a low dose of 0.45 mg/kg, the plasma clearance of bevacizumab was 6.96 mL/h/kg after IV administration; this clearance is higher than that reported after higher doses. Half-lives of bevacizumab after SC and IV administration were 4.6 and 3.9 days, respectively. After SC administration, bevacizumab–IRDye800CW was present in the axillary lymph nodes that drain the SC site; lymph node uptake of bevacizumab–IRDye 800CW was negligible after IV administration. Bevacizumab exhibited complete bioavailability after SC administration. Using a compartmental pharmacokinetic model, the fraction absorbed through the lymphatics after SC administration was estimated to be about 1%. This is the first report evaluating the use of fluorescent imaging to determine the pharmacokinetics, lymphatic uptake, and bioavailability of a near-infrared dye-labeled antibody conjugate.

Key words

bevacizumab bioavailability fluorescence imaging lymphatic absorption pharmacokinetics 



This work was supported by a grant from the University at Buffalo Center for Protein Therapeutics to MEM. The authors thank Dr. E.J. Bergey and Dr. P.N. Prasad of the Institute for Lasers, Photonics and Biophotonics, University at Buffalo, for use of the Maestro imaging system and their expertise with fluorescence imaging.

Supplementary material

12248_2012_9342_MOESM1_ESM.docx (12 kb)
ESM 1 (DOCX 12 kb)


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Copyright information

© American Association of Pharmaceutical Scientists 2012

Authors and Affiliations

  1. 1.Department of Pharmaceutical SciencesUniversity at Buffalo, State University of New YorkAmherstUSA

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