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Tytuł:
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The role of TLR4/NF-κB signaling in the radioprotective effects of exogenous Prdx6.
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Autorzy:
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Sharapov MG; Institute of Cell Biophysics of the Russian Academy of Sciences, PSCBR RAS, Pushchino, Russia. Electronic address: .
Glushkova OV; Institute of Cell Biophysics of the Russian Academy of Sciences, PSCBR RAS, Pushchino, Russia.
Parfenyuk SB; Institute of Cell Biophysics of the Russian Academy of Sciences, PSCBR RAS, Pushchino, Russia.
Gudkov SV; Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia.
Lunin SM; Institute of Cell Biophysics of the Russian Academy of Sciences, PSCBR RAS, Pushchino, Russia.
Novoselova EG; Institute of Cell Biophysics of the Russian Academy of Sciences, PSCBR RAS, Pushchino, Russia.
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Źródło:
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Archives of biochemistry and biophysics [Arch Biochem Biophys] 2021 May 15; Vol. 702, pp. 108830. Date of Electronic Publication: 2021 Mar 13.
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Typ publikacji:
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Journal Article; Research Support, Non-U.S. Gov't
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Język:
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English
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Imprint Name(s):
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Publication: <2000- > : San Diego, CA : Elsevier
Original Publication: New York, NY : Academic Press
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MeSH Terms:
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NF-kappa B/*metabolism
Peroxiredoxin VI/*pharmacology
Radiation-Protective Agents/*pharmacology
Signal Transduction/*drug effects
Toll-Like Receptor 4/*metabolism
3T3 Cells ; Animals ; Apoptosis/drug effects ; Apoptosis/radiation effects ; Mice ; Models, Molecular ; Oxidative Stress/drug effects ; Oxidative Stress/radiation effects ; Peroxiredoxin VI/chemistry ; Peroxiredoxin VI/metabolism ; Protein Conformation ; Radiation-Protective Agents/chemistry ; Radiation-Protective Agents/metabolism ; Signal Transduction/radiation effects ; Toll-Like Receptor 4/chemistry
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Contributed Indexing:
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Keywords: Ionizing radiation; NF-κB signaling; Peroxiredoxin 6; Radioprotection; TLR4
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Substance Nomenclature:
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0 (NF-kappa B)
0 (Radiation-Protective Agents)
0 (Toll-Like Receptor 4)
EC 1.11.1.15 (Peroxiredoxin VI)
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Entry Date(s):
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Date Created: 20210317 Date Completed: 20210524 Latest Revision: 20210524
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Update Code:
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20240105
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DOI:
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10.1016/j.abb.2021.108830
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PMID:
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33727039
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Peroxiredoxin 6 (Prdx6) is a bifunctional enzyme with multi-substrate peroxidase and phospholipase activities that is involved in cell redox homeostasis and regulates intracellular processes. Previously, recombinant Prdx6 was shown to exert a radioprotective effect during whole-body exposure to a lethal dose of X-ray radiation. Moreover, a mutant form Prdx6-C47S, which lacks peroxidase activity, also had a radioprotective effect, and this indicates that the mechanism of radioprotection is unknown. The present study was aimed to test the hypothesis that the radioprotective effect of Prdx6 and Prdx6-C47S may be mediated through the TLR4/NF-κB signaling pathway. It was demonstrated that exogenously applied Prdx6 protected 3T3 fibroblast cells against LD50 X-ray radiation in vitro. Pretreatment with Prdx6 increased cell survival, stimulated proliferation, normalized the level of reactive oxygen species in culture, and suppressed apoptosis and necrosis. Wild-type Prdx6 and, to a lesser degree, the Prdx6-C47S mutant proteins promoted a significant increase in NF-κB activation in irradiated cells, which likely contributes to the antiapoptotic effect. Pretreatment with TLR4 inhibitors, especially those directed to the extracellular part of the receptor, significantly reduced the radioprotective effect, and this supports the role of TLR4 signaling in the protective effects of Prdx6. Therefore, the radioprotective effect of Prdx6 was related not only to its antioxidant properties, but also to its ability to trigger cellular defense mechanisms through interaction with the TLR4 receptor and subsequent activation of the NF-κB pathway. Recombinant Prdx6 may be useful for the development of a new class of safe radioprotective compounds that have a combination of antioxidant and immunomodulatory properties.
(Copyright © 2021 Elsevier Inc. All rights reserved.)
