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2014 ; 71
(ä): 196-207
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Redox regulation of antioxidants, autophagy, and the response to stress:
implications for electrophile therapeutics
#MMPMID24681256
Levonen AL
; Hill BG
; Kansanen E
; Zhang J
; Darley-Usmar VM
Free Radic Biol Med
2014[Jun]; 71
(ä): 196-207
PMID24681256
show ga
Redox networks in the cell integrate signaling pathways that control metabolism,
energetics, cell survival, and death. The physiological second messengers that
modulate these pathways include nitric oxide, hydrogen peroxide, and
electrophiles. Electrophiles are produced in the cell via both enzymatic and
nonenzymatic lipid peroxidation and are also relatively abundant constituents of
the diet. These compounds bind covalently to families of cysteine-containing,
redox-sensing proteins that constitute the electrophile-responsive proteome, the
subproteomes of which are found in localized intracellular domains. These include
those proteins controlling responses to oxidative stress in the cytosol-notably
the Keap1-Nrf2 pathway, the autophagy-lysosomal pathway, and proteins in other
compartments including mitochondria and endoplasmic reticulum. The signaling
pathways through which electrophiles function have unique characteristics that
could be exploited for novel therapeutic interventions; however, development of
such therapeutic strategies has been challenging due to a lack of basic
understanding of the mechanisms controlling this form of redox signaling. In this
review, we discuss current knowledge of the basic mechanisms of
thiol-electrophile signaling and its potential impact on the translation of this
important field of redox biology to the clinic. Emerging understanding of
thiol-electrophile interactions and redox signaling suggests replacement of the
oxidative stress hypothesis with a new redox biology paradigm, which provides an
exciting and influential framework for guiding translational research.
|Aldehydes/metabolism
[MESH]
|Animals
[MESH]
|Antioxidants/*metabolism/therapeutic use
[MESH]
|Autophagy/*genetics
[MESH]
|Gene Expression Regulation
[MESH]
|Heat-Shock Proteins/genetics/metabolism
[MESH]
|Humans
[MESH]
|Hydrogen Peroxide/metabolism
[MESH]
|Intracellular Signaling Peptides and Proteins/genetics/metabolism
[MESH]