1
|
Buscetta M, Di Vincenzo S, Miele M, Badami E, Pace E, Cipollina C. Cigarette smoke inhibits the NLRP3 inflammasome and leads to caspase-1 activation via the TLR4-TRIF-caspase-8 axis in human macrophages. FASEB J 2020; 34:1819-1832. [PMID: 31914643 DOI: 10.1096/fj.201901239r] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 10/24/2019] [Accepted: 11/11/2019] [Indexed: 12/17/2022]
Abstract
The NLRP3 inflammasome is formed by the sensor NLRP3, the adaptor ASC, and pro-caspase-1. Assembly and activation of the inflammasome trigger caspase-1-dependent cleavage of pro-IL-1β and pro-IL-18 into their secreted forms. Cigarette smoke is a risk factor for chronic inflammatory diseases and is associated with macrophage dysfunction. The impact of cigarette smoke on NLRP3-dependent responses in macrophages is largely unknown. Herein, we investigated the effects of cigarette smoke extract (CSE) on the NLRP3 inflammasome in human monocyte-derived macrophages (MDMs) and THP-1 cells stimulated with lipopolysaccharide (LPS) and LPS plus the NLRP3 inflammasome activator ATP. We found that CSE inhibited the release of IL-1β and IL-18 as well as the expression of NLRP3 acting mainly at the transcriptional level. Interestingly, we found that CSE increased the caspase-1 activity via an NLRP3-independent and TLR4-TRIF-caspase-8-dependent pathway. Activation of caspase-1 by CSE led to a reduction of the basal glycolytic flux and impaired glycolytic burst in response to LPS. Overall, our findings unveil novel pathways leading to immune-metabolic alterations in human macrophages exposed to cigarette smoke. These mechanisms may contribute to macrophage dysfunction and increased risk of infection in smokers.
Collapse
Affiliation(s)
| | - Serena Di Vincenzo
- Istituto per la Ricerca e l'Innovazione Biomedica-Consiglio Nazionale delle Ricerche, Palermo, Italy
| | - Monica Miele
- Fondazione Ri.MED, Palermo, Italy
- Department of Laboratory Medicine and Advanced Biotechnologies, Istituto Mediterraneo per i Trapianti e Terapie ad alta specializzazione (IRCCS-ISMETT), Palermo, Italy
| | - Ester Badami
- Fondazione Ri.MED, Palermo, Italy
- Department of Laboratory Medicine and Advanced Biotechnologies, Istituto Mediterraneo per i Trapianti e Terapie ad alta specializzazione (IRCCS-ISMETT), Palermo, Italy
| | - Elisabetta Pace
- Istituto per la Ricerca e l'Innovazione Biomedica-Consiglio Nazionale delle Ricerche, Palermo, Italy
| | - Chiara Cipollina
- Fondazione Ri.MED, Palermo, Italy
- Istituto per la Ricerca e l'Innovazione Biomedica-Consiglio Nazionale delle Ricerche, Palermo, Italy
| |
Collapse
|
2
|
Allam R, Lawlor KE, Yu ECW, Mildenhall AL, Moujalled DM, Lewis RS, Ke F, Mason KD, White MJ, Stacey KJ, Strasser A, O'Reilly LA, Alexander W, Kile BT, Vaux DL, Vince JE. Mitochondrial apoptosis is dispensable for NLRP3 inflammasome activation but non-apoptotic caspase-8 is required for inflammasome priming. EMBO Rep 2014; 15:982-90. [PMID: 24990442 PMCID: PMC4198042 DOI: 10.15252/embr.201438463] [Citation(s) in RCA: 170] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 05/23/2014] [Accepted: 05/24/2014] [Indexed: 01/09/2023] Open
Abstract
A current paradigm proposes that mitochondrial damage is a critical determinant of NLRP3 inflammasome activation. Here, we genetically assess whether mitochondrial signalling represents a unified mechanism to explain how NLRP3 is activated by divergent stimuli. Neither co-deletion of the essential executioners of mitochondrial apoptosis BAK and BAX, nor removal of the mitochondrial permeability transition pore component cyclophilin D, nor loss of the mitophagy regulator Parkin, nor deficiency in MAVS affects NLRP3 inflammasome function. In contrast, caspase-8, a caspase essential for death-receptor-mediated apoptosis, is required for efficient Toll-like-receptor-induced inflammasome priming and cytokine production. Collectively, these results demonstrate that mitochondrial apoptosis is not required for NLRP3 activation, and highlight an important non-apoptotic role for caspase-8 in regulating inflammasome activation and pro-inflammatory cytokine levels.
Collapse
Affiliation(s)
| | - Kate E Lawlor
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - Eric Chi-Wang Yu
- Department of Biochemistry, University of Lausanne, Epalinges, Switzerland
| | - Alison L Mildenhall
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - Donia M Moujalled
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - Rowena S Lewis
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - Francine Ke
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - Kylie D Mason
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - Michael J White
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - Katryn J Stacey
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Qld, Australia
| | - Andreas Strasser
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - Lorraine A O'Reilly
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - Warren Alexander
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - Benjamin T Kile
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - David L Vaux
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - James E Vince
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| |
Collapse
|
3
|
Abstract
Fas (APO-1/CD95) is an important apoptotic mediator for both immune and nervous systems. In the present study, we have investigated the expression and function of Fas in human embryonic/fetal brain primary cultures from 12 human embryos and fetuses with gestational ages between 5 to 22 weeks. Anti-Fas fluorescent antibody was used for labeling of Fas positive cells and for quantitation of Fas expression in brain cultures. To demonstrate that Fas receptor is functional in human embryonic/fetal brain cells, anti-Human-Fas monoclonal antibody (0.5 microg/ml) was used to induce apoptosis in brain primary cultures. Apoptosis was investigated by flow-cytometry and fluorescent microscopy using TUNEL and annexin V labeling. Fas was found to be expressed in the embryonic/fetal human primary brain cultures, on neuronal and glial cells or their precursors, varying with gestational ages. Cross-linking of Fas induced apoptosis in brain cultures indicating that Fas receptor functions as a death receptor. We also showed that cell death triggered through Fas receptor was caspase dependent, hence it was blocked by a selective caspase-8 inhibitor (IETD-fmk). These results suggest that Fas is involved in neuronal apoptosis in the developing human brain.
Collapse
Affiliation(s)
- R Nat
- Division of Cellular and Molecular Medicine, Carol Davila University of Medicine and Pharmacy, 8 Eroilor Sanitari, Bucharest, Romania
| | | | | | | |
Collapse
|
4
|
Takeda Y, Nakao K, Nakata K, Kawakami A, Ida H, Ichikawa T, Shigeno M, Kajiya Y, Hamasaki K, Kato Y, Eguchi K. Geranylgeraniol, an intermediate product in mevalonate pathway, induces apoptotic cell death in human hepatoma cells: death receptor-independent activation of caspase-8 with down-regulation of Bcl-xL expression. Jpn J Cancer Res 2001; 92:918-25. [PMID: 11572758 PMCID: PMC5926844 DOI: 10.1111/j.1349-7006.2001.tb01181.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Geranylgeraniol (GGOH), an intermediate of mevalonate metabolism, is known to induce apoptosis in various lines of cancer cells. The present study was undertaken to clarify the signaling pathways of apoptosis induced by GGOH in human hepatoma cells. HuH-7 human hepatoma cells were incubated in the absence or presence of GGOH. Activation of caspase-8 /-9 /-3 in HuH-7 cells was found after 8 h treatment with GGOH, at which time DNA fragmentation and loss of mitochondrial transmembrane potential (Deltaphim) occurred. HuH-7 cells do not express Bcl-2; however, down-regulation of Bcl-xL expression preceded activation of the caspase cascade in GGOH-treated HuH-7 cells, while Bax expression was not changed by GGOH treatment. Addition of caspase inhibitors restored the decreased cell viability of HuH-7 cells by GGOH, including Deltaphim, to the baseline level, which indicated that caspase triggers mitochondria-dependent apoptotic pathways in GGOH-treated HuH-7 cells. Similarly, GGOH-mediated apoptosis of HuH-7 cells was clearly prevented by coadministration of ursodeoxycholic acid (UDCA), which led to restoration of the level of Bcl-xL expression. Activation of caspase-8 /-9 /-3, as well as Deltaphim, by GGOH treatment was suppressed by addition of UDCA. Our results indicate that activation of the caspase cascade initiating from caspase-8, which could be accelerated by down-regulation of Bcl-xL expression, plays a key role in an apoptotic process induced by GGOH in human hepatoma cells.
Collapse
Affiliation(s)
- Y Takeda
- The First Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki University, Nagasaki 852-8501, Japan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|