Abstract
Oxime reactivators of acetylcholinesterase are commonly used to treat highly toxic organophosphate poisoning. They are effective nucleophiles that can restore the catalytic activity of acetylcholinesterase; however, their main limitation is the difficulty in crossing the blood–brain barrier (BBB) because of their strongly hydrophilic nature. Various approaches to overcome this limitation and enhance the bioavailability of oxime reactivators in the CNS have been evaluated; these include structural modifications, conjugation with molecules that have transporters in the BBB, bypassing the BBB through intranasal delivery, and inhibition of BBB efflux transporters. A promising approach is the use of nanoparticles (NPs) as the delivery systems. Studies using mesoporous silica nanomaterials, poly (l-lysine)-graft-poly(ethylene oxide) NPs, metallic organic frameworks, poly(lactic-co-glycolic acid) NPs, human serum albumin NPs, liposomes, solid lipid NPs, and cucurbiturils, have shown promising results. Some NPs are considered as nanoreactors for organophosphate detoxification; these combine bioscavengers with encapsulated oximes. This study provides an overview and critical discussion of the strategies used to enhance the bioavailability of oxime reactivators in the central nervous system.
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Abbreviations
- ACh:
-
Acetylcholine
- AChE:
-
Acetylcholinesterase
- AD:
-
Alzheimer’s disease
- BBB:
-
Blood–brain barrier
- BChE:
-
Butyrylcholinesterase
- CAS:
-
Catalytic active site
- CBs:
-
Cucurbiturils
- ChEs:
-
Cholinesterases
- CNS:
-
Central nervous system
- CWA:
-
Chemical warfare agents
- DFP:
-
Diisopropyl fluorophosphate
- DHDHAB:
-
Dihexadecylmethylhydroxyethyl ammonium bromide
- GLUT1:
-
Glucose transporter protein type 1
- 3-HPA:
-
6-(5-(6,7-Dimethoxy-3,4-dihydroisochinolin-2(1H)-yl)pentyl)-3-hydroxypicolinaldehyde oxime
- LüH-6:
-
Obidoxime
- MILs:
-
Materials of Institut Lavoisier
- MMB-4:
-
Methoxime
- MOFs:
-
Metal organic frameworks
- MSMs:
-
Mesoporous silica materials
- MSN:
-
Mesoporous silica nanoparticles
- NA:
-
Nerve agents
- NPs:
-
Nanoparticles
- OP:
-
Organophosphate
- OPAA:
-
Organophosphorus acid anhydrolase
- 2-PAM:
-
Pralidoxime
- 4-PAM:
-
4-Pyridine aldoxime
- PAMPA:
-
Parallel artificial membrane permeability
- PAS:
-
Peripheral aromatic site
- PEG:
-
Polyethylene glycol
- P-gp:
-
P-Glycoprotein
- PLGA:
-
Poly(lactic-co-glycolic acid)
- PLL-g-PEO:
-
Poly(l-lysine)-graft-poly(ethylene oxide)
- PON-1:
-
Paraoxonase-1
- PTE:
-
Phosphotriesterase
- SLNs:
-
Solid lipid nanoparticles
- STEM:
-
Scanning transmission electron microscopy
- TEPP:
-
Tetraethyl pyrophosphate
- TMB-4:
-
Trimedoxime
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Acknowledgements
This study was supported by the Czech Science Foundation (Grant No. GA22-14568S) and Operational Programme “Development of the Internal Grant Agency of the University of Hradec Kralove” (Reg. No. CZ.02.2.69/0.0/0.0/19_073/0016949, project IGRA-TYM-2021001). Figures 9, 11, 14, 15, and TOC figure were created using BioRender.com.
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Prchalova, E., Kohoutova, Z., Knittelova, K. et al. Strategies for enhanced bioavailability of oxime reactivators in the central nervous system. Arch Toxicol 97, 2839–2860 (2023). https://doi.org/10.1007/s00204-023-03587-0
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DOI: https://doi.org/10.1007/s00204-023-03587-0