Title:Characterization and Immunogenicity of Recombinant A. flavus Uox
Modified by Co/EDTA Carbon Dots
Volume: 25
Issue: 2
Author(s): Hai-Ling Li, Xiu-Feng Gao*, Jing-Ji Li, Ming-Xia Wan, Guo-Qi Zhang and Yong-Sheng Li*
Affiliation:
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, P.R.
China
- School of Chemical Engineering, Sichuan University, Chengdu, 610065, P.R. China
Keywords:
UA, hyperuricemia, Uox, Co/EDTA-Uox, cytotoxicity, immunogenicity.
Abstract:
Background: Uricase (Uox) is a major drug in gout and a supplementary drug in cancer
treatment. Because allergic reactions caused by Uox limit its clinical application,10% Co/EDTA
was used to chemically modify Uox from A. flavus to reduce its immunogenicity.
Methods: The immunogenicity of Uox and 10% Co/EDTA-Uox was examined by determining the
antibody titer and concentration of IL-2, IL-6, IL-10, and TNF-β in quail and rat serum. Moreover,
we examined the pharmacokinetics of 10% Co/EDTA-Uox in rats and acute toxicity in mice.
Results: The concentration of UA decreased from 771.85 ± 180.99 to 299.47 ± 20.37 μmoL/L
(p<0.01) in the hyperuricemia model of quails injected by 10% Co/EDTA-Uox. Two-way immuno-
diffusion electrophoresis revealed that 10% Co/EDTA-Uox did not produce antibody, whereas
the antibody titer against Uox was 1:16. The concentrations of four cytokines in the 10%
Co/EDTA-Uox group were significantly lower than in Uox group (p < 0.01); The titer of IgG and
IgM against 10% Co/EDTA-Uox was significantly lower than that against Uox at different serum
dilutions (p < 0.0001). The pharmacokinetic data indicated that the half-life time of 10%
Co/EDTA- Uox (69.315 h) was significantly longer than that of Uox (13.4 h) (p<0.01). The tissue
section of the liver, heart, kidney, and spleen revealed no toxicity in Uox and 10% Co/EDTA- Uox
groups.
Conclusion: 10% Co/EDTA-Uox possesses little immunogenicity, a long half-life time, and a
highly efficient degradation of UA.