Article (Scientific journals)
Role of the Redox State of Human Peroxiredoxin-5 on Its TLR4-Activating DAMP Function.
Poncin, Mégane A; Van Meerbeeck, Pierre; Simpson, Joshua D et al.
2021In Antioxidants (Basel, Switzerland), 10 (12), p. 1902
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Keywords :
DAMP; PRDX5; SMFS; TLR4; Toll-like receptor; atomic force microscopy; cysteine residue; peroxiredoxins; redox; Biochemistry; Physiology; Molecular Biology; Clinical Biochemistry; Cell Biology
Abstract :
[en] Human peroxiredoxin-5 (PRDX5) is a unique redox-sensitive protein that plays a dual role in brain ischemia-reperfusion injury. While intracellular PRDX5 has been reported to act as a neuroprotective antioxidative enzyme by scavenging peroxides, once released extracellularly from necrotic brain cells, the protein aggravates neural cell death by inducing expression of proinflammatory cytokines in macrophages through activation of Toll-like receptor (TLR) 2 (TLR2) and 4 (TLR4). Although recent evidence showed that PRDX5 was able to interact directly with TLR4, little is known regarding the role of the cysteine redox state of PRDX5 on its DAMP function. To gain insights into the role of PRDX5 redox-active cysteine residues in the TLR4-dependent proinflammatory activity of the protein, we used a recombinant human PRDX5 in the disulfide (oxidized) form and a mutant version lacking the peroxidatic cysteine, as well as chemically reduced and hyperoxidized PRDX5 proteins. We first analyzed the oxidation state and oligomerization profile by Western blot, mass spectrometry, and SEC-MALS. Using ELISA, we demonstrate that the disulfide bridge between the enzymatic cysteines is required to allow improved TLR4-dependent IL-8 secretion. Moreover, single-molecule force spectroscopy experiments revealed that TLR4 alone is not sufficient to discriminate the different PRDX5 redox forms. Finally, flow cytometry binding assays show that disulfide PRDX5 has a higher propensity to bind to the surface of living TLR4-expressing cells than the mutant protein. Taken together, these results demonstrate the importance of the redox state of PRDX5 cysteine residues on TLR4-induced inflammation.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Poncin, Mégane A;  Louvain Institue of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
Van Meerbeeck, Pierre;  Louvain Institue of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
Simpson, Joshua D;  Louvain Institue of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
Clippe, André;  Louvain Institue of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
Tyckaert, François;  Louvain Institue of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
Bouillenne, Fabrice ;  Université de Liège - ULiège > Integrative Biological Sciences (InBioS)
Degand, Hervé;  Louvain Institue of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
Matagne, André  ;  Université de Liège - ULiège > Département des sciences de la vie > Centre d'ingénierie des protéines
Morsomme, Pierre ;  Louvain Institue of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
Knoops, Bernard;  Louvain Institue of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
Alsteens, David ;  Louvain Institue of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
Language :
English
Title :
Role of the Redox State of Human Peroxiredoxin-5 on Its TLR4-Activating DAMP Function.
Publication date :
27 November 2021
Journal title :
Antioxidants (Basel, Switzerland)
ISSN :
2076-3921
eISSN :
2076-3921
Publisher :
MDPI, Switzerland
Volume :
10
Issue :
12
Pages :
1902
Peer reviewed :
Peer reviewed
Funding text :
Funding: This research was funded by the Fonds National de la Recherche Scientifique (F.R.S.-FNRS), grant number PDR T.0070.16 to D.A., the Research Department of the Communauté française de Belgique (Concerted Research Action); the Université catholique de Louvain (Fonds Spéciaux de Recherche). M.A.P. and D.A. are respectively FRIA researcher and Research Associate from the FNRS.This research was funded by the Fonds National de la Recherche Scientifique (F.R.S.-FNRS), grant number PDR T.0070.16 to D.A., the Research Department of the Communaut? fran?aise de Belgique (Concerted Research Action); the Universit? catholique de Louvain (Fonds Sp?ciaux de Recherche). M.A.P. and D.A. are respectively FRIA researcher and Research Associate from the FNRS.
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