Abstract
Purpose
Heparin-binding EGF-like growth factor (HB-EGF) is a member of the EGF family and is an important therapeutic target in some types of human cancers. KHK2866 is a humanized anti-HB-EGF monoclonal antibody IgG that neutralizes HB-EGF activity by inhibiting the binding of HB-EGF to its receptors. The phase I study of KHK2866 was discontinued because of neuropsychiatric toxicity. In this study, the pharmacokinetics of KHK2866 was evaluated by 89Zr-immuno-PET study and the determination of drug concentrations in serum and cerebrospinal fluid using cynomolgus monkeys was performed in order to predict neurotoxicity in a reverse-translational manner.
Methods
KHK2866 was radiolabeled with 89Zr for preclinical evaluations in normal cynomolgus monkeys and its distribution was analyzed. Furthermore, as a separate study, KHK2866 concentrations in serum and cerebrospinal fluid were determined after administration of a single dose.
Results
PET studies with monkeys revealed 89Zr-KHK2866 accumulation in the liver, spleen and joints of multiple parts, but not in brain. In addition, the pharmacokinetic analyses in serum and CSF demonstrated a low penetration of KHK2866 into the brain.
Conclusions
These studies indicate the difficulty of prediction for neuropsychiatric toxicity of monoclonal antibodies in human by means of pharmacokinetic evaluations using cynomolgus monkeys.
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Abbreviations
- BBB:
-
Blood–brain barrier
- Bq:
-
Becquerel
- CSF:
-
Cerebrospinal fluid
- CT:
-
Computed tomography
- CTAC:
-
CT-based attenuation correction
- EGF:
-
Epidermal growth factor
- ELISA:
-
Enzyme-linked immunosorbent assay
- FWHM:
-
Full width half maximum
- HB-EGF:
-
Heparin-binding EGF-like growth factor
- HPLC:
-
High performance liquid chromatography
- IACUC:
-
Institutional animal care and use committee
- LLOQ:
-
Lower limit of quantification
- MIP:
-
Maximum intensity projections
- MTD:
-
Maximum tolerated dose
- PET:
-
Positron emission tomography
- PK:
-
Pharmacokinetics
- QC:
-
Quality control
- SUV:
-
Standard uptake value
- TLC:
-
Thin-layer chromatography
- VOI:
-
Volume of interest
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ACKNOWLEDGMENTS AND DISCLOSURES
We thank Drs. T. Tawara, N. Mimura, A. Takami, Y Yoda, J Hosogi, K Fujita, H. Kaito, and TW. Poh for excellent support and helpful suggestion. This research was funded by Kyowa Hakko Kirin, Co. Ltd.
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Fig. S1
Comparison of antigen-binding activities between cold Zr-KHK2866 and unlabeled KHK2866 by antigen-coated ELISA. The antigen-binding activity was compared by antigen-coated ELISA as described below briefly. Coated antigen; recombinant human HB-EGF (R&D Systems), analytes; cold Zr-KHK2866 or unlabeled KHK2866 (0.137-100 ng/ml), detection antibody; anti-human IgG (whole molecule)-peroxidase antibody produced in rabbit (Sigma), substrate; TMB (3,3′,5,5;-tetramethylbenzidine) chromogen solution (Life Technologies), microplate reader; Varioskan Flash (Thermo Scientific). OD450 nm; optical density at 450 nm. (JPEG 49 kb)
Fig. S2
Calibration curves of the electrochemiluminescence assay for the determination of KHK2866 and KM8047 concentrations in cynomolgus monkey serum (A) and CSF (B). Calibration curves were generated by 4-parameter regression of the natural logarithmic transformed nominal concentrations of the calibration standards (X axis), except for the 0 μg/ml sample, and the natural logarithmic transformed mean values of duplicate signal intensity (Y axis). (JPEG 175 kb)
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Kasai, N., Adachi, M. & Yamano, K. Preclinical Pharmacokinetics Evaluation of Anti-heparin-binding EGF-like Growth Factor (HB-EGF) Monoclonal Antibody Using Cynomolgus Monkeys via 89Zr-immuno-PET Study and the Determination of Drug Concentrations in Serum and Cerebrospinal Fluid. Pharm Res 33, 476–486 (2016). https://doi.org/10.1007/s11095-015-1803-2
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DOI: https://doi.org/10.1007/s11095-015-1803-2