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https://www.readbyqxmd.com/read/29150951/inflammasome-its-role-in-traumatic-brain-and-spinal-cord-injury
#1
REVIEW
Keywan Mortezaee, Neda Khanlarkhani, Cordian Beyer, Adib Zendedel
Traumatic brain injury (TBI) and spinal cord injury (SCI) are pathological events that lead to neuropathological conditions which have in consequence the initiation of pro-inflammatory cytokine production. Neuroinflammation plays a key role in the secondary phase of both TBI and SCI after initial cell death. Activation of cytoplasmic inflammasome complexes is regarded as the essential step of neuroinflammation and a key trigger for neuronal death called pyroptosis. Inflammasome complexes are involved in activation of caspase-1 which catalyzes the cleavage of pro-interleukins into their active forms (including interleukin-18 (IL-18) and IL-1β)...
November 18, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29147575/cell-death-and-cell-lysis-are-separable-events-during-pyroptosis
#2
Lucian DiPeso, Daisy X Ji, Russell E Vance, Jordan V Price
Although much insight has been gained into the mechanisms by which activation of the inflammasome can trigger pyroptosis in mammalian cells, the precise kinetics of the end stages of pyroptosis have not been well characterized. Using time-lapse fluorescent imaging to analyze the kinetics of pyroptosis in individual murine macrophages, we observed distinct stages of cell death and cell lysis. Our data demonstrate that cell membrane permeability resulting from gasdermin D pore formation is coincident with the cessation of cell movement, loss of mitochondrial activity, and cell swelling, events that can be uncoupled from cell lysis...
2017: Cell Death Discovery
https://www.readbyqxmd.com/read/29135573/evidence-of-inflammasome-activation-and-formation-of-monocyte-derived-apoptosis-associated-speck-like-protein-containing-a-caspase-recruitment-domain-specks-in-hiv-1-positive-patients
#3
Fareed Ahmad, Neha Mishra, Gerrit Ahrenstorf, Bernardo S Franklin, Eicke Latz, Reinhold E Schmidt, Lukas Bossaller
OBJECTIVE: The formation of large intracellular protein aggregates of the inflammasome adaptor apoptosis-associated speck-like protein containing a caspase-recruitment domain (ASC) (PYCARD) is a hallmark of inflammasome activation. ASC speck-forming cells release the highly proinflammatory cytokine IL-1β in addition to ASC specks into the extracellular space during pyroptotic cell death. There ASC specks can propagate inflammation to other nonactivated cells or tissues. HIV-1 retroviral infection triggers inflammasome activation of abortively infected CD4 T cells in secondary lymphatic tissues...
November 10, 2017: AIDS
https://www.readbyqxmd.com/read/29129476/pyroptosis-and-its-relationship-to-atherosclerosis
#4
REVIEW
Yuan-Jun Xu, Lei Zheng, Yan-Wei Hu, Qian Wang
Pyroptosis is a pro-inflammatory form of regulated cell death and is dependent on the enzymatic activity of inflammatory proteases that belong to the family of cysteine-dependent aspartate-specific proteases (caspases). Pyroptosis is morphologically, mechanistically, and pathophysiologically distinct from other forms of cell death, including apoptosis and necrosis. Pyroptosis is characterized by rapid plasma membrane rupture, with the consequent release of intracellular contents and pro-inflammatory mediators, including interleukin (IL)-1β, IL-18, and the alarmin HMGB-1...
November 10, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/29128729/recent-advances-in-inflammasome-biology
#5
REVIEW
David E Place, Thirumala-Devi Kanneganti
The inflammasome is a complex of proteins that through the activity of caspase-1 and the downstream substrates gasdermin D, IL-1β, and IL-18 execute an inflammatory form of cell death termed pyroptosis. Activation of this complex often involves the adaptor protein ASC and upstream sensors including NLRP1, NLRP3, NLRC4, AIM2, and pyrin, which are activated by different stimuli including infectious agents and changes in cell homeostasis. Here we discuss new regulatory mechanisms that have been identified for the canonical inflammasomes, the most recently identified NLRP9b inflammasome, and the new gasdermin family of proteins that mediate pyroptosis and other forms of regulated cell death...
November 9, 2017: Current Opinion in Immunology
https://www.readbyqxmd.com/read/29113699/involvement-of-caspase-4-in-il-1-beta-production-and-pyroptosis-in-human-macrophages-during-dengue-virus-infection
#6
Ka Tik Cheung, Daniel Man-Yuen Sze, Kwok Hung Chan, Polly Hang-Mei Leung
Caspase-4 physically interacts with caspase-1 and is believed to be a proinflammatory caspase that can induce the inflammatory form of programmed cell death (pyroptosis) and the release of mature interleukin (IL)-1β. However, the function of caspase-4 in dengue virus infection is not yet fully understood. We examined the function of caspase-4 in IL-1β production and pyroptosis during dengue virus serotype-2 (DENV-2) infection in human macrophages. In this study, DENV-2 infection increased IL-1β protein level with activated caspase-4 activity...
October 26, 2017: Immunobiology
https://www.readbyqxmd.com/read/29113303/mitochondrion-associated-protein-peroxiredoxin-3-promotes-benign-prostatic-hyperplasia-through-autophagy-suppression-and-pyroptosis-activation
#7
Min-Yao Jiang, Zhao-Dong Han, Wenjiao Li, Fei Yue, Jianheng Ye, Bowei Li, Zhiduan Cai, Jian-Ming Lu, Weimin Dong, Xianhan Jiang, Weide Zhong, Huichan He, Leyuan Liu
Benign prostatic hyperplasia (BPH) is one of the most common diseases in the senior men and age plays an important role in the initiation and development of BPH. Mammalian cells primarily use the autophagy-lysosome system to degrade misfolded/aggregated proteins and dysfunctional organelles such as mitochondria and suppress pyroptosis, a type of cell death that stimulates inflammatory responses and growth of other cells around. Peroxiredoxin 3 (PRDX3) is the only mitochondrion-associated member of peroxiredoxin family enzymes that exert their protective antioxidant role in cells through their peroxidase activity...
October 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/29108122/pyroptosis-by-caspase11-4-gasdermin-d-pathway-in-alcoholic-hepatitis
#8
Elena Khanova, Raymond Wu, Wen Wang, Rui Yan, Yibu Chen, Samuel W French, Cristina Llorente, Stephanie Q Pan, Qihong Yang, Yuchang Li, Raul Lazaro, Charles Ansong, Richard D Smith, Ramon Bataller, Timothy Morgan, Bernd Schnabl, Hidekazu Tsukamoto
Alcoholic hepatitis (AH) continues to be a disease with high mortality and no efficacious medical treatment. Although severe AH is presented as acute on chronic liver failure, what underlies this transition from chronic alcoholic steatohepatitis (ASH) to AH, is largely unknown. To address this question, unbiased RNA-seq and proteomic analyses were performed on livers of the recently developed AH mouse model which exhibits the shift to AH from chronic ASH upon weekly alcohol binge, and these results are compared with gene expression profiling data from AH patients...
November 6, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29103428/overview-of-inflammation-in-neurometabolic-diseases
#9
Gregory A Grabowski
Neuroinflammation is an intrinsic component of the neurodegeneration of inborn errors of neurometabolic diseases. Diseases resulting in lysosomal, peroxisomal, and autophagocytic disruption lead to neuroinflammation by different mechanisms relating to accumulated substrates and/or downstream deficiencies that cause presymptomatic microglial activation, axonal instabilities and/or direct hyperactivation of intrinsic inflammatory mechanisms. Only in selected diseases is the blood-brain barrier (BBB) breached, thereby permitting peripheral adaptive immune mechanisms to amplify intrinsic immune reactions in the central nervous system...
August 2017: Seminars in Pediatric Neurology
https://www.readbyqxmd.com/read/29100888/caspase-1-is-an-apical-caspase-leading-to-caspase-3-cleavage-in-the-aim2-inflammasome-response-independent-of-caspase-8
#10
Vitaliya Sagulenko, Nazarii Vitak, Parimala Vajjhala, James E Vince, Katryn J Stacey
Canonical inflammasomes are multiprotein complexes that can activate both caspase-1 and caspase-8. Caspase-1 drives rapid lysis of cells by pyroptosis and maturation of IL-1β and IL-18. In caspase-1-deficient cells, inflammasome formation still leads to caspase-3 activation and slower apoptotic death, dependent on caspase-8 as an apical caspase. A role for caspase-8 directly upstream of caspase-1 has also been suggested, but here we show that caspase-8-deficient macrophages have no defect in AIM2 inflammasome-mediated caspase-1 activation, pyroptosis and IL-1β release...
October 31, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/29097227/the-role-of-the-nlrp3-inflammasome-in-regulation-of-antiviral-responses-to-influenza-a-virus-infection
#11
REVIEW
Soroush T Sarvestani, Julie L McAuley
The innate immune system provides the host with both a dynamic barrier to prevent infection and a means to which rapid anti-microbial responses can be mounted. The inflammasome pathway is a critical host early response mechanism that enables detection of pathogens and initiates production of inflammatory cytokines, inducing recruitment of effector cells to the site of infection. The complete mechanism of inflammasome activation requires two signals: an initial priming step upon detection of pathogen, followed by activation of intracellular pattern recognition receptors critical to the formation of the inflammasome complex...
October 31, 2017: Antiviral Research
https://www.readbyqxmd.com/read/29095793/low-dose-sinapic-acid-abates-the-pyroptosis-of-macrophages-via-downregulation-of-lncrna-malat1-in-rats-with-diabetic-atherosclerosis
#12
Yong Han, Hong Qiu, Xing Pei, Yigang Fan, Hongyan Tian, Jie Geng
Pyroptosis is a type of programmed cell death, which has been associated with multiple inflammatory diseases including diabetic atherosclerosis (DA). The study aims to explore the role of sinapic acid (SA) in the pyroptosis of macrophages in diabetic atherosclerosis. Our results from the in vivo experiments showed that low-dose (≤ 50 mg/Kg) chronic SA adiministration suppressed serum endothelin 1 (ET-1) and interleukine-1β (IL-1β) contents, pyroptotic death of bone marrow derived macrophages (BMDMs), and the expression of pyroptotic proteins ASC, NRLP3 and Caspase-1...
October 27, 2017: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/29094619/acute-in-vitro-and-in-vivo-toxicity-of-a-commercial-grade-boron-nitride-nanotube-mixture
#13
Vamsi K Kodali, Jenny R Roberts, Mohammad Shoeb, Michael G Wolfarth, Lindsey Bishop, Tracy Eye, Mark Barger, Katherine A Roach, Sherri Friend, Diane Schwegler-Berry, Bean T Chen, Aleksandr Stefaniak, Kevin C Jordan, Roy R Whitney, Dale W Porter, Aaron D Erdely
Boron nitride nanotubes (BNNTs) are an emerging engineered nanomaterial attracting significant attention due to superior electrical, chemical and thermal properties. Currently, the toxicity profile of this material is largely unknown. Commercial grade BNNTs are composed of a mixture (BNNT-M) of ∼50-60% BNNTs, and ∼40-50% impurities of boron and hexagonal boron nitride. We performed acute in vitro and in vivo studies with commercial grade BNNT-M, dispersed by sonication in vehicle, in comparison to the extensively studied multiwalled carbon nanotube-7 (MWCNT-7)...
October 2017: Nanotoxicology
https://www.readbyqxmd.com/read/29089078/-nlrp3-inflammasome-induces-pyroptosis-in-lung-tissues-of-radiation-induced-lung-injury-in-mice
#14
Rong Han, Dongming Wu, Shihua Deng, Teng Liu, Ting Zhang, Ying Xu
Objective To establish a radiation-induced lung injury model and investigate the role of caspase-1-dependent programmed cell death (pyroptosis) in the pathogenesis of radiation pneumonitis. Methods BALB/c mice were sacrificed after receiving 5-day 15 Gy X-ray irradiation at chest cavity. The pathological changes of pulmonary tissues were observed by HE staining. The apoptosis of lung tissues cells after irradiation was detected by TUNEL assay. The expressions of γ-H2AX, ki67, NLR family pyrin domain containing 3 (NLRP3), caspase-1, apoptosis-associated speck-like protein containing a CARD (ASC/TMS-1) were detected by Western blot analysis...
September 2017: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
https://www.readbyqxmd.com/read/29079428/globular-adiponectin-protects-hepatocytes-from-tunicamycin-induced-cell-death-via-modulation-of-the-inflammasome-and-heme-oxygenase-1-induction
#15
Amrita Khakurel, Pil-Hoon Park
Endoplasmic reticulum (ER) stress, which is defined as the accumulation of unfolded or misfolded proteins in the ER, triggers cellular dysfunction and eventually leads to cell death. In particular, excessive and prolonged ER stress is closely related with hepatic injury. Adiponectin, a hormone predominantly produced by adipose tissue, is known to possess potent hepatoprotective properties and exhibits a cytoprotective effect in response to chronic ER stress. However, the underlying mechanisms are not clearly understood...
October 24, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/29077095/caspase-4-activation-by-a-bacterial-surface-protein-is-mediated-by-cathepsin-g-in-human-gingival-fibroblasts
#16
Hye-Kyoung Jun, Young-Jung Jung, Suk Ji, Sun-Jin An, Bong-Kyu Choi
Caspase-4 is an inflammatory caspase; however, its mechanism of activation is poorly understood. In this study, we demonstrate that Td92, a surface protein of the periodontal pathogen Treponema denticola and a homolog of the Treponema pallidum surface protein Tp92, activates caspase-4 and induces pyroptosis in primary cultured human gingival fibroblasts (HGFs) via cathepsin G activation. Cathepsin G inhibition or siRNA knockdown of cathepsin G inhibited Td92-induced caspase-4 activation and cell death. Td92-induced cell death was significantly inhibited by siRNA knockdown of gasdermin D...
October 27, 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/29076500/plasma-membrane-changes-during-programmed-cell-deaths
#17
REVIEW
Yingying Zhang, Xin Chen, Cyril Gueydan, Jiahuai Han
Ruptured and intact plasma membranes are classically considered as hallmarks of necrotic and apoptotic cell death, respectively. As such, apoptosis is usually considered a non-inflammatory process while necrosis triggers inflammation. Recent studies on necroptosis and pyroptosis, two types of programmed necrosis, revealed that plasma membrane rupture is mediated by MLKL channels during necroptosis but depends on non-selective gasdermin D (GSDMD) pores during pyroptosis. Importantly, the morphology of dying cells executed by MLKL channels can be distinguished from that executed by GSDMD pores...
October 27, 2017: Cell Research
https://www.readbyqxmd.com/read/29066283/the-extent-of-pyroptosis-varies-in-different-stages-of-apical-periodontitis
#18
Ran Cheng, Yuchao Feng, Rui Zhang, Wen Liu, Lei Lei, Tao Hu
Apical periodontitis (AP) is an inflammation affecting the periapical region of tooth root. Microbial pathogens activate inflammasomes and promote the production of pro-inflammatory cytokines. Caspase-1-mediated pyroptosis is a possible mechanism involved in the initiation and progression of AP. The purpose of this study was to evaluate the role of caspase-1 and pyroptosis on AP at different stages. Human periapical inflammatory tissue was collected to study chronic AP stage. Human periodontal ligament fibroblasts (hPDLFs) were stimulated with lipopolysaccharide in vitro for 24h to simulate early AP stage...
October 21, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29063417/propofol-does-not-reduce-pyroptosis-of-enterocytes-and-intestinal-epithelial-injury-after-lipopolysaccharide-challenge
#19
Xu-Yu Zhang, Xi Chen, Hu-Fei Zhang, Su Guan, Shi-Hong Wen, Wen-Qi Huang, Zi-Meng Liu
BACKGROUND: To date, mechanisms of sepsis-induced intestinal epithelial injury are not well known. P2X7 receptor (P2X7R) regulates pyroptosis of lymphocytes, and propofol is usually used for sedation in septic patients. AIMS: We aimed to determine the occurrence of enterocyte pyroptosis mediated by P2X7R and to explore the effects of propofol on pyroptosis and intestinal epithelial injury after lipopolysaccharide (LPS) challenge. METHODS: A novel regimen of LPS challenge was applied in vitro and in vivo...
October 23, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/29062465/nlrp3-inflammasome-activation-mediated-pyroptosis-aggravates-myocardial-ischemia-reperfusion-injury-in-diabetic-rats
#20
Zhen Qiu, Shaoqing Lei, Bo Zhao, Yang Wu, Wating Su, Min Liu, Qingtao Meng, Bin Zhou, Yan Leng, Zhong-Yuan Xia
The reactive oxygen species- (ROS-) induced nod-like receptor protein-3 (NLRP3) inflammasome triggers sterile inflammatory responses and pyroptosis, which is a proinflammatory form of programmed cell death initiated by the activation of inflammatory caspases. NLRP3 inflammasome activation plays an important role in myocardial ischemia/reperfusion (MI/R) injury. Our present study investigated whether diabetes aggravated MI/R injury through NLRP3 inflammasome-mediated pyroptosis. Type 1 diabetic rat model was established by intraperitoneal injection of streptozotocin (60 mg/kg)...
2017: Oxidative Medicine and Cellular Longevity
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