Abstract
Purpose
We investigated the tissue distribution of a humanized anti-human Fas monoclonal antibody, R-125224, in SCID mice transplanted with synovial tissues from patients with rheumatoid arthritis (SCID-HuRAg mice). The binding kinetics of R-125224 was also determined, using isolated human synovial cells.
Materials and Methods
Tissue distribution was assessed at 1, 24 and 168 h after intravenous administration of 125I-R-125224 to SCID-HuRAg mice (0.4 mg/kg). The in vitro binding of 125I-R-125224 to isolated human synovial cells was investigated.
Results
After intravenous administration of 125I-R-125224 to SCID-HuRAg mice, the radioactivity distributed to various tissues at 1 h. Thereafter, the radioactivity in the tissues gradually decreased except for the transplanted synovial tissues, in which the radioactivity increased in a time-dependent manner, and at 168 h, the tissue/plasma concentration ratio was about 1. The in vitro binding affinity of 125I-R-125224 to human synovial cells was high with a dissociation constant of 1.32 ± 0.62 nM and the binding was inhibited by non-labeled R-125224 in a concentration-dependent manner.
Conclusion
R-125224, a candidate compound for treating rheumatoid arthritis, specifically distributed to the pharmacological target site, human synovium transplanted in SCID mice, with high affinity.
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Abbreviations
- 125I-PBI:
-
N-Succinimidyl 4-125I-iodobenzoate
- HRPO:
-
horseradish peroxidase
- SCID:
-
severe combined immunodeficiency
- TMB:
-
3,3′,5,5′tetramethylbenzidine
- TNF:
-
tumor necrosis factor
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Acknowledgments
We thank Dr. Katsumi Sato (Tohoku Rosai Hospital) for providing synovial tissues.
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Saito, M., Yoshigae, Y., Nakayama, J. et al. In SCID Mice with Transplanted Joint Tissues from Rheumatism Patients, a Model Mice of Human Rheumatoid Arthritis, Anti-human Fas Antibody (R-125224) Distributes Specifically to Human Synovium. Pharm Res 24, 310–317 (2007). https://doi.org/10.1007/s11095-006-9148-5
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DOI: https://doi.org/10.1007/s11095-006-9148-5