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2018 ; 162
(2
): 429-438
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Determination of Protein Haptenation by Chemical Sensitizers Within the
Complexity of the Human Skin Proteome
#MMPMID29267982
Parkinson E
; Aleksic M
; Cubberley R
; Kaur-Atwal G
; Vissers JPC
; Skipp P
Toxicol Sci
2018[Apr]; 162
(2
): 429-438
PMID29267982
show ga
Skin sensitization associated with the development of allergic contact dermatitis
occurs via a number of specific key events at the cellular level. The molecular
initiating event (MIE), the first in the sequence of these events, occurs after
exposure of the skin to an electrophilic chemical, causing the irreversible
haptenation of proteins within skin. Characterization of this MIE is a key step
in elucidating the skin sensitization adverse outcome pathway and is essential to
providing parameters for mathematical models to predict the capacity of a
chemical to cause sensitization. As a first step to addressing this challenge, we
have exposed complex protein lysates from a keratinocyte cell line and human skin
tissue with a range of well characterized sensitizers, including
dinitrochlorobenzene, 5-chloro-2-methylisothiazol-3-one, cinnamaldehyde, and the
non (or weak) sensitizer 6-methyl coumarin. Using a novel stable isotope labeling
approach combined with ion mobility-assisted data independent mass spectrometry
(HDMSE), we have characterized the haptenome for these sensitizers. Although a
significant proportion of highly abundant proteins were haptenated, we also
observed the haptenation of low abundant proteins by all 3 of the chemical
sensitizers tested, indicating that within a complex protein background, protein
abundance is not the sole determinant driving haptenation, highlighting a
relationship to tertiary protein structure and the amino acid specificity of
these chemical sensitizers and sensitizer potency.