Lysosomotropic-related limitations of the BALB/c 3T3 cell-based neutral red uptake assay and an alternative testing approach for assessing e-liquid cytotoxicity.
Identifieur interne : 000A29 ( Ncbi/Merge ); précédent : 000A28; suivant : 000A30Lysosomotropic-related limitations of the BALB/c 3T3 cell-based neutral red uptake assay and an alternative testing approach for assessing e-liquid cytotoxicity.
Auteurs : Gianluca Cudazzo [Suisse] ; Daniel J. Smart [Suisse] ; Damian Mchugh [Suisse] ; Patrick Vanscheeuwijck [Suisse]Source :
- Toxicology in vitro : an international journal published in association with BIBRA [ 1879-3177 ] ; 2019.
Descripteurs français
- KwdFr :
- MESH :
- métabolisme : Lysosomes, Rouge neutre.
- toxicité : Nicotine.
- Animaux, Dosage biologique, Humains, Lignée cellulaire, Souris, Survie cellulaire.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Neutral Red.
- drug effects : Cell Survival.
- metabolism : Lysosomes.
- chemical , toxicity : Nicotine.
- Animals, Biological Assay, Cell Line, Electronic Nicotine Delivery Systems, Humans, Mice.
Abstract
Cytotoxicity assays are used to quantify the cytotoxic potential of chemicals. The neutral red uptake (NRU) assay is one of these assays and is routinely used in the pharmaceutical, cosmetic, and tobacco industries. In the context of e-cigarette development, an NRU assay-based screen was implemented to evaluate the cytotoxic potential of e-liquids. E-liquids induced a biphasic response in the BALB/c 3T3-based assay. The NRU initially increased in a concentration-dependent manner before decreasing following treatment with higher concentrations until NRU was abolished. Experiments were performed to characterize the mechanism underlying this biphasic signal. Nicotine alone was found to induce the same biphasic effects, while inducing concentration-dependent decreases in relative cell counts (RCC). Imaging and flow cytometry data revealed that the increases in NRU likely resulted from nicotine-induced vacuolization via a lysosomotropic mechanism. In support of this, two lysosomotropic agents, chloroquine and lapatinib, induced similar profiles. Nicotine's effects were also translatable, as brain-, lung-, bone marrow-, and smooth muscle-derived mammalian cells responded with the biphasic NRU signal. However, like RCC, three other cytotoxicity endpoints, resazurin, adenosine triphosphate, and water soluble tetrazolium salt (WST)-8, were not subject to these effects. The WST-8 assay is proposed as an alternative to screen the cytotoxic potential of e-liquids.
DOI: 10.1016/j.tiv.2019.104647
PubMed: 31518669
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<front><div type="abstract" xml:lang="en">Cytotoxicity assays are used to quantify the cytotoxic potential of chemicals. The neutral red uptake (NRU) assay is one of these assays and is routinely used in the pharmaceutical, cosmetic, and tobacco industries. In the context of e-cigarette development, an NRU assay-based screen was implemented to evaluate the cytotoxic potential of e-liquids. E-liquids induced a biphasic response in the BALB/c 3T3-based assay. The NRU initially increased in a concentration-dependent manner before decreasing following treatment with higher concentrations until NRU was abolished. Experiments were performed to characterize the mechanism underlying this biphasic signal. Nicotine alone was found to induce the same biphasic effects, while inducing concentration-dependent decreases in relative cell counts (RCC). Imaging and flow cytometry data revealed that the increases in NRU likely resulted from nicotine-induced vacuolization via a lysosomotropic mechanism. In support of this, two lysosomotropic agents, chloroquine and lapatinib, induced similar profiles. Nicotine's effects were also translatable, as brain-, lung-, bone marrow-, and smooth muscle-derived mammalian cells responded with the biphasic NRU signal. However, like RCC, three other cytotoxicity endpoints, resazurin, adenosine triphosphate, and water soluble tetrazolium salt (WST)-8, were not subject to these effects. The WST-8 assay is proposed as an alternative to screen the cytotoxic potential of e-liquids.</div>
</front>
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<Abstract><AbstractText>Cytotoxicity assays are used to quantify the cytotoxic potential of chemicals. The neutral red uptake (NRU) assay is one of these assays and is routinely used in the pharmaceutical, cosmetic, and tobacco industries. In the context of e-cigarette development, an NRU assay-based screen was implemented to evaluate the cytotoxic potential of e-liquids. E-liquids induced a biphasic response in the BALB/c 3T3-based assay. The NRU initially increased in a concentration-dependent manner before decreasing following treatment with higher concentrations until NRU was abolished. Experiments were performed to characterize the mechanism underlying this biphasic signal. Nicotine alone was found to induce the same biphasic effects, while inducing concentration-dependent decreases in relative cell counts (RCC). Imaging and flow cytometry data revealed that the increases in NRU likely resulted from nicotine-induced vacuolization via a lysosomotropic mechanism. In support of this, two lysosomotropic agents, chloroquine and lapatinib, induced similar profiles. Nicotine's effects were also translatable, as brain-, lung-, bone marrow-, and smooth muscle-derived mammalian cells responded with the biphasic NRU signal. However, like RCC, three other cytotoxicity endpoints, resazurin, adenosine triphosphate, and water soluble tetrazolium salt (WST)-8, were not subject to these effects. The WST-8 assay is proposed as an alternative to screen the cytotoxic potential of e-liquids.</AbstractText>
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