PEGylation of bacterial cocaine esterase for protection against protease digestion and immunogenicity.
Enhancing cocaine metabolism by administration of cocaine esterase (CocE) has been considered as a promising treatment strategy for cocaine overdose and addiction, as CocE is the most efficient native enzyme yet identified for metabolizing the naturally occurring cocaine. A major obstacle to the clinical application of CocE, however, lies in its thermo-instability, rapid degradation by circulating proteases, and potential immunogenicity. PEGylation, namely by modifying a protein or peptide compound via attachment of polyethylene glycol (PEG) chains, has been proven to overcome such problems and was therefore exploited in this CocE investigation. The PEG-CocE conjugates prepared in this study showed a purity of greater than 93.5%. Attachment of PEG to CocE apparently inhibited the binding of anti-CocE antibodies to the conjugate, as demonstrated by the enzyme-linked immunosorbent assay (ELISA) assay. In addition, PEGylation yielded protection to CocE against thermal degradation and protease digestion. Furthermore, preliminary in vivo results suggested that, similarly to native CocE, the PEG-CocE conjugates were able to protect animals from cocaine-induced toxic effects. Overall, this study provides evidence that the PEGylation may serve as a tool to prolong CocE functionality in the circulation and reduce its potential immunogenicity.
Park
Jun-Beom
JB
Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, United States.
Kwon
Young Min
YM
Lee
Tien-Yi
TY
Brim
Remy
R
Ko
Mei-Chuan
MC
Sunahara
Roger K
RK
Woods
James H
JH
Yang
Victor C
VC
D000818:Animals; D002265:Carboxylic Ester Hydrolases / Q000737:chemistry / Q000276:immunology / Q000378:metabolism* / Q000627:therapeutic use*; D003042:Cocaine / Q000009:adverse effects; D019970:Cocaine-Related Disorders / Q000188:drug therapy*; D004795:Enzyme Stability; D008297:Male; D051379:Mice; D011092:Polyethylene Glycols / Q000737:chemistry*; D012240:Rhodococcus / Q000201:enzymology*; D013696:Temperature; D014357:Trypsin / Q000378:metabolism
D011092:Polyethylene Glycols; D002265:Carboxylic Ester Hydrolases; C019921:cocaine esterase; D014357:Trypsin; D003042:Cocaine