Cited by 265Inflammasome and immune disordersNeuroinflammation and Neurodegeneration MechanismsImmune Response and Inflammation

Role of mitochondria ROS generation in ethanol-induced NLRP3 inflammasome activation and cell death in astroglial cells

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Alfonso-Loeches, Silvia, Ureña-Peralta, Juan R., Morillo-Bargues, Maria José, Oliver-De La Cruz, Jorge, Guerri, Consuelo·2014·Frontiers in Cellular Neuroscience

Abstract

Toll-like receptors (TLRs) and NOD-like receptors (NLRs) are innate immunity sensors that provide an early/effective response to pathogenic or injury conditions. We have reported that ethanol-induced TLR4 activation triggers signaling inflammatory responses in glial cells, causing neuroinflammation and brain damage. However, it is uncertain if ethanol is able to activate NLRs/inflammasome in astroglial cells, which is the mechanism of activation, and whether there is crosstalk between both immune sensors in glial cells. Here we show that chronic ethanol treatment increases the co-localization of caspase-1 with GFAP(+) cells, and up-regulates IL-1β and IL-18 in the frontal medial cortex in WT, but not in TLR4 knockout mice. We further show that cultured cortical astrocytes expressed several inflammasomes (NLRP3, AIM2, NLRP1, and IPAF), although NLRP3 mRNA is the predominant form. Ethanol, as ATP and LPS treatments, up-regulates NLRP3 expression, and causes caspase-1 cleavage and the release of IL-1β and IL-18 in astrocytes supernatant. Ethanol-induced NLRP3/caspase-1 activation is mediated by mitochondrial (m) reactive oxygen species (ROS) generation because when using a specific mitochondria ROS scavenger, the mito-TEMPO (500 μM) or NLRP3 blocking peptide (4 μg/ml) or a specific caspase-1 inhibitor, Z-YVAD-FMK (10 μM), abrogates mROS release and reduces the up-regulation of IL-1β and IL-18 induced by ethanol or LPS or ATP. Confocal microscopy studies further confirm that ethanol, ATP or LPS promotes NLRP3/caspase-1 complex recruitment within the mitochondria to promote cell death by caspase-1-mediated pyroptosis, which accounts for ≈73% of total cell death (≈22%) and the remaining (≈25%) die by caspase-3-dependent apoptosis. Suppression of the TLR4 function abrogates most ethanol effects on NLRP3 activation and reduces cell death. These findings suggest that NLRP3 participates, in ethanol-induced neuroinflammation and highlight the NLRP3/TLR4 crosstalk in ethanol-induced brain injury.

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Authors
Alfonso-Loeches, S., Ureña-Peralta, J. R., Morillo-Bargues, M. J., Oliver-De La Cruz, J., & Guerri, C.
Affiliations
Centro de Investigacion Principe Felipe (ES)
Corresponding author
Guerri, Consuelo
Venue
Frontiers in Cellular Neuroscience
Published
2014-08-01
Volume
8
Pages
216-216
ISSN
1662-5102 (ISSN-L)
OpenAlex
W2081653529
Cited by
265
References
61
Citations by year
2026: 11 · 2025: 19 · 2024: 21 · 2023: 22 · 2022: 33 · 2021: 33 · 2020: 27 · 2019: 24 · 2018: 22 · 2017: 22 · 2016: 21 · 2015: 8 · 2014: 2
FWCI
7.25
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Cellular Neuroscience (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Ministerio de Economía y Competitividad
  • Ministerio de Ciencia e Innovación
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
ethanol, NLRP3 inflammasome, reactive oxygen species, mitochondria, astrocytes, caspase-1, pyroptosis, TLR4, neuroinflammation, IL-1β, IL-18, innate immunity, brain injury, apoptosis, LPS, ATP

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