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Multi-walled carbon nanotube oxidation dependent keratinocyte cytotoxicity and skin inflammation.

Abstract：

BACKGROUND:The effects of carbon nanotubes on skin toxicity have not been extensively studied; however, our lab has previously shown that a carboxylated multi-walled carbon nanotube (MWCNT) exacerbates the 2, 4-dinitrofluorobenzene induced contact hypersensitivity response in mice. Here we examine the role of carboxylation in MWCNT skin toxicity. RESULTS:MWCNTs were analyzed by transmission electron microscopy, zetasizer, and x-ray photoelectron spectroscopy to fully characterize the physical properties. Two MWCNTs with different levels of surface carboxylation were chosen for further testing. The MWCNTs with a high level of carboxylation displayed increased cytotoxicity in a HaCaT keratinocyte cell line, compared to the MWCNTs with intermediate levels of carboxylation. However, neither functionalized MWCNT increased the level of in vitro reactive oxygen species suggesting an alternative mechanism of cytotoxicity. Each MWCNT was tested in the contact hypersensitivity model, and only the MWCNTs with greater than 20% surface carboxylation exacerbated the ear swelling responses. Analysis of the skin after MWCNT exposure reveals that the same MWCNTs with a high level of carboxylation increase epidermal thickness, mast cell and basophil degranulation, and lead to increases in polymorphonuclear cell recruitment when co-administered with 2, 4-dinitrofluorobenzene. CONCLUSIONS:The data presented here suggest that acute, topical application of low doses of MWCNTs can induce keratinocyte cytotoxicity and exacerbation of allergic skin conditions in a carboxylation dependent manner.

journal_name

Part Fibre Toxicol

journal_title

Particle and fibre toxicology

authors

Palmer BC,Phelan-Dickenson SJ,DeLouise LA

doi

10.1186/s12989-018-0285-x

subject

Has Abstract

pub_date

2019-01-08 00:00:00

pages

3

issue

1

issn

1743-8977

pii

10.1186/s12989-018-0285-x

journal_volume

16

pub_type

杂志文章

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