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2015 ; 11
(11
): e1004582
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Dynamic Redox Regulation of IL-4 Signaling
#MMPMID26562652
Dwivedi G
; Gran MA
; Bagchi P
; Kemp ML
PLoS Comput Biol
2015[Nov]; 11
(11
): e1004582
PMID26562652
show ga
Quantifying the magnitude and dynamics of protein oxidation during cell signaling
is technically challenging. Computational modeling provides tractable,
quantitative methods to test hypotheses of redox mechanisms that may be
simultaneously operative during signal transduction. The interleukin-4 (IL-4)
pathway, which has previously been reported to induce reactive oxygen species and
oxidation of PTP1B, may be controlled by several other putative mechanisms of
redox regulation; widespread proteomic thiol oxidation observed via 2D redox
differential gel electrophoresis upon IL-4 treatment suggests more than one
redox-sensitive protein implicated in this pathway. Through computational
modeling and a model selection strategy that relied on characteristic STAT6
phosphorylation dynamics of IL-4 signaling, we identified reversible protein
tyrosine phosphatase (PTP) oxidation as the primary redox regulatory mechanism in
the pathway. A systems-level model of IL-4 signaling was developed that
integrates synchronous pan-PTP oxidation with ROS-independent mechanisms. The
model quantitatively predicts the dynamics of IL-4 signaling over a broad range
of new redox conditions, offers novel hypotheses about regulation of JAK/STAT
signaling, and provides a framework for interrogating putative mechanisms
involving receptor-initiated oxidation.