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Methods to evaluate the toxicity of engineered nanomaterials for biomedical applications: a review

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Abstract

Nanomaterials can be engineered with distinctive properties for their use in agriculture, environment, medicine, cosmetics and household commodities. Nonetheless, knowledge on the toxicity of engineered nanomaterials is actually limited, and their potential adverse effects should not be overlooked. In particular, it is important to understand the dynamics and mechanism of nanotoxicity. Toxicity of engineered nanomaterials arises mainly from their ability to produce reactive oxygen species, their ease of absorption and distribution into various tissues, and their kinetics of elimination from the human body. Therefore, toxicity mechanisms should be tested in model biological systems, with focus on properties such as size, shape, surface modification, composition, and aggregation. Here we review the fundamentals of nanotoxicity, methods to assess the toxicity of engineered nanomaterials, approaches to reduce toxicity during synthesis, and prospects of engineered nanomaterials in nanomedicine.

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Abbreviations

AMPK:

Adenosine monophosphate-activated protein kinase

AP-1:

Activator protein-1

ATP:

Adenosine triphosphate

BBB:

Blood–brain-barrier

CTAB:

Cetyltrimethylammonium bromide

DCFH-DA:

Dichloro-dihydro-fluorescein diacetate

EPR:

Enhanced permeability and retention

ENMs:

Engineered nanomaterials

GI tract:

Gastrointestinal tract

GSH-Px:

Glutathione peroxidase

GO:

Graphene oxides

LDH:

Lactate dehydrogenase

MAPK:

Mitogen-activated protein kinase

MTS:

3-(4,5-Dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium

MTT:

3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide

MWCNTs:

Multi-walled carbon nanotubes

NAD:

Nicotinamide adenine dinucleotide

nano-SAR:

Nano-structure activity relationship

NF-κB:

Nuclear factor kappa-light-chain-enhancer of activated B cells

mTOR:

Mammalian target of rapamycin

ROS:

Reactive oxygen species

QSARs:

Quantitative structure–activity relationships

QSTR:

Quantitative structure–toxicity relationship

QTTR:

Quantitative toxicity–toxicity relationship

SWCNTs:

Single-walled carbon nanotubes

TiO2 :

Titanium dioxide

TLRs:

Toll-like receptors

TNF-α:

Tumor necrosis factor-α

UV:

Ultraviolet

WST-1:

2-(4-Iodophenyl)-3-(4-nitrophenyl)-5-(2,4-disulfophenyl)-2H-tetrazolium

XTT:

2,3-Bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide

ZnO:

Zinc oxide

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Acknowledgements

NPN and HKD acknowledge the support of Japan Science and Technology (JST) Agency, Japan toward Asia Youth Exchange Program in Science (Sakura Exchange Program). HKD also appreciates the Centre for Advanced Materials and Industrial Chemistry (CAMIC) in the School of Sciences, RMIT University, Australia for an ‘Honorary Visiting Research Fellowship.’

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Correspondence to Hemant Kumar Daima.

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Patel, G., Patra, C., Srinivas, S.P. et al. Methods to evaluate the toxicity of engineered nanomaterials for biomedical applications: a review. Environ Chem Lett 19, 4253–4274 (2021). https://doi.org/10.1007/s10311-021-01280-1

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  • DOI: https://doi.org/10.1007/s10311-021-01280-1

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