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Strategies for enhanced bioavailability of oxime reactivators in the central nervous system

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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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Correspondence to David Malinak or Kamil Musilek.

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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

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