scholarly journals LncRNA Gm14205 induces astrocytic NLRP3 inflammasome activation via inhibiting oxytocin receptor in postpartum depression

2020 ◽  
Vol 40 (8) ◽  
Author(s):  
Jialei Zhu ◽  
Jing Tang
Keyword(s):  
Postpartum Depression ◽  
Nlrp3 Inflammasome ◽  
Oxytocin Receptor ◽  
Pathological Process ◽  
Receptor Protein ◽  
Inflammasome Activation ◽  
Protective Effects ◽  
Nlrp3 Inflammasome Activation ◽  
New Strategy ◽  
Non Coding Rnas

Abstract Postpartum depression (PPD) is a kind of mental disorder characterized by persistent low emotions in puerperium. The most significant physiological change in postpartum is lactation which is regulated by oxytocin receptor (OXTR). However, whether OXTR is related to pathological process of PPD and the potential mechanism still remain unclear. In the present study, we prepared hormone-simulated pregnancy (HSP)-induced PPD mouse model and found that the protein level of OXTR in hippocampus of PPD model mice was down-regulated and Nod-like receptor protein 3 (NLRP3) inflammasome was activated. We identified five long non-coding RNAs (lncRNAs) related to PPD by transcriptome sequencing, including three up-regulated and two down-regulated. The five lncRNAs were associated with the signaling pathway of OXTR according to the bioinformatics analysis. Furthermore, we focused on one of the five lncRNAs, Gm14205, and found that it targeted OXTR which inhibited astrocytic NLRP3 inflammasome activation in hippocampal primary astrocytes. These findings illustrate that OXTR has protective effects in PPD by inhibiting NLRP3 inflammasome activation and provides a new strategy for targeting lncRNA Gm14205 in the pathogenesis of PPD.

scholarly journals Vaspin Alleviates Osteoarthritis by Inhibiting NLRP3-mediated Inflammation

2021 ◽  
Author(s):  
Xianjie Zhu ◽  
Shiyou Dai ◽  
Baohua Xia ◽  
Jianbao Gong ◽  
Bingzheng Ma
Keyword(s):  
Nlrp3 Inflammasome ◽  
Wistar Rat ◽  
Cartilage Degradation ◽  
Pathological Process ◽  
Inflammasome Activation ◽  
Protective Effects ◽  
Collagen Formation ◽  
Nlrp3 Inflammasome Activation

Abstract Background:Osteoarthritis (OA) is a chronic degenerative joint bone disease characterized by cartilage degradation. Visceral adipose tissue-derived serine protease inhibitor (vaspin) is associated with the inflammatory and metabolic responses to OA. However, the underlying mechanisms of the pathological process of OA are not clear. The aim of the present study was to examine the protective effects of vaspin both in vitro and in vivo.Methods:Monosodium iodoacetate (MIA)-induced Wistar rat model of OA was used to assess the in vivo effects of vaspin administered for 12 weeks. The characteristics of OA were evaluated by haematoxylin and eosin (H&E) and safranin O/fast green staining. The anti-inflammatory effect of vaspin was assessed using immunohistochemical, qRT-PCR, and western blotting analysis. Parallel experiments to detect the molecular mechanism through which vaspin prevents OA were performed using LPS-treated chondrocytes.Results:Our results showed that the degeneration of cartilage and upregulated expression of matrix metalloproteinase (MMP)-1 and MMP-13 were ameliorated by vaspin. Additionally, vaspin suppressed the activation of TXNIP/NLRP3 and secretion of tumor necrosis factor ɑ and interleukin-1β in vivo. It was further confirmed that vaspin could also suppress LPS-induced NLRP3 inflammasome activation and reduce collagen formation in chondrocytes. Moreover, vaspin inhibited NLRP3 inflammasome activation by suppressing the ROS/TXNIP pathway.Conclusions: Vaspin inhibited OA by repressing TXNIP/NLRP3 activation in in vitro and in vivo models of OA, thus providing a novel therapeutic strategy for OA.

scholarly journals Orientin Ameliorates LPS-Induced Inflammatory Responses through the Inhibitory of the NF-κB Pathway and NLRP3 Inflammasome

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Qingfei Xiao ◽  
Zhihui Qu ◽  
Ying Zhao ◽  
Liming Yang ◽  
Pujun Gao
Keyword(s):  
Nlrp3 Inflammasome ◽  
Inflammatory Responses ◽  
Receptor Protein ◽  
Raw 264.7 Cells ◽  
Prostaglandin E ◽  
Inflammasome Activation ◽  
Therapeutic Effects ◽  
Protective Effects ◽  
Nlrp3 Inflammasome Activation ◽  
Underlying Mechanisms

Inflammation is a complex response to diverse pathological conditions, resulting in negative rather than protective effects when uncontrolled. Orientin (Ori), a flavonoid component isolated from natural plants, possesses abundant properties. Thus, we aimed to discover the potential therapeutic effects of orientin on lipopolysaccharide- (LPS-) induced inflammation in RAW 264.7 cells and the underlying mechanisms. In our studies, we evaluated the effects of Ori on proinflammatory mediator production stimulated by LPS, including tumor necrosis factor- (TNF-) α, interleukin- (IL-) 6, IL-18, and IL-1β, along with prostaglandin E2 (PGE2) and NO. Our data indicated that orientin dramatically inhibited the levels of these mediators. Consistent with these results, the expression levels of cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) were also reduced. Further study demonstrated that such inhibitory effects of Ori were due to suppression of the nuclear factor-kappa B (NF-κB) pathway and nucleotide-binding domain- (NOD-) like receptor protein 3 (NLRP3) inflammasome activation, which may contribute to its anti-inflammatory effects. Together, these findings show that Ori may be an effective candidate for ameliorating LPS-induced inflammatory responses.

scholarly journals Dexmedetomidine Ameliorates Hippocampus Injury and Cognitive Dysfunction Induced by Hepatic Ischemia/Reperfusion by Activating SIRT3-Mediated Mitophagy and Inhibiting Activation of the NLRP3 Inflammasome in Young Rats

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Wenli Yu ◽  
Jingshu Lyu ◽  
Lili Jia ◽  
Mingwei Sheng ◽  
Hongli Yu ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Nlrp3 Inflammasome ◽  
Ischemia Reperfusion ◽  
Mitochondrial Protein ◽  
Receptor Protein ◽  
Inflammasome Activation ◽  
Protective Effects ◽  
Hepatic Ischemia ◽  
Nlrp3 Inflammasome Activation ◽  
Hepatic Ischemia Reperfusion

Hepatic ischemia-reperfusion (HIR) has been proven to trigger oxidative stress and pyroptosis in the hippocampus. Sirtuin 3 (SIRT3) is an essential mitochondrial protein deacetylase regulating oxidative stress and mitophagy. Dexmedetomidine (Dex) has been demonstrated to confer neuroprotection in different brain injury models. However, whether the protective effects of Dex following HIR are orchestrated by activation of SIRT3-mediated mitophagy and inhibition of NOD-like receptor protein 3 (NLRP3) inflammasome activation remains unknown. Herein, two-week-old rats were treated with Dex or a selective SIRT3 inhibitor (3-TYP)/autophagy inhibitor (3-MA) and then subjected to HIR. The results revealed that Dex treatment effectively attenuated neuroinflammation and cognitive deficits via upregulating SIRT3 expression and activity. Furthermore, Dex treatment inhibited the activation of NLRP3 inflammasome, while 3-TYP and 3-MA eliminated the protective effects of Dex, suggesting that SIRT3-mediated mitophagy executes the protective effects of Dex. Moreover, 3-TYP treatment downregulated the expression level of SIRT3 downstream proteins: forkhead-box-protein 3α (FOXO3α), superoxide dismutase 2 (SOD2), peroxiredoxin 3 (PRDX3), and cyclophilin D (CYP-D), which were barely influenced by 3-MA treatment. Notably, both 3-TYP and 3-MA were able to offset the antioxidative and antiapoptosis effects of Dex, indicating that SIRT3-mediated mitophagy may be the last step and the major pathway executing the neuroprotective effects of Dex. In conclusion, Dex inhibits HIR-induced NLRP3 inflammasome activation mainly by triggering SIRT3-mediated mitophagy.

scholarly journals A novel function of NLRP3 independent of inflammasome as a key transcription factor of IL-33 in epithelial cells of atopic dermatitis

2021 ◽  
Vol 12 (10) ◽  
Author(s):  
Jie Zheng ◽  
Lu Yao ◽  
Yijing Zhou ◽  
Xiaoqun Gu ◽  
Can Wang ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Atopic Dermatitis ◽  
Epithelial Cells ◽  
Mrna Expression ◽  
Nlrp3 Inflammasome ◽  
Myeloid Cells ◽  
Pathological Process ◽  
Inflammasome Activation ◽  
Mice Model ◽  
Nlrp3 Inflammasome Activation

AbstractAtopic dermatitis (AD) is a common chronic pruritic inflammatory skin disorder characterized by recurrent eczematous lesions. Interleukin (IL)−33, a cytokine of the IL-1 family, was found to play an important role in the pathogenesis of AD. As a key component of the inflammasome, NLRP3 has been mostly described in myeloid cells that to mediate inflammasome activation conducted proinflammatory cytokine production of the IL-1 family. However, the role of NLRP3 inflammasome in the pathogenesis of AD, as well as IL-33 processing are highly controversial. Whether NLRP3 can mediate IL-33 expression and secretion independently of the inflammasome in the epithelium of AD has remained unclear. In this article, we found the mRNA expression of Il33 and Nlrp3 were notably increased in the lesional skin of AD patients compared to healthy controls. We then found a significant positive correlation between the expression of Nlrp3 and Il33 in the epithelium of MC903-mediated AD mice model, but no changes were observed for Il36α, Il36γ, Il1β, or Il18 mRNA expression, as well as IL-1β or IL-18 production. Overexpression of NLRP3 in human immortalized epithelial cells increased IL-33 expression, whereas siRNA targeting NLRP3 abolished IL-33 expression. In addition, inhibition of NLRP3 inflammasome activation or caspase-1 activity with MCC950 or VX-765 showed no effect on the expression and secretion of IL-33 in AD mice. Unlike myeloid cells, NLRP3 predominantly located in the nucleus of epithelial cells, which could directly bind to Il33 specific-promoters and transactivate it through an interaction with transcription factor IRF4. Furthermore, NLRP3 deficient mice exhibited a significant alleviated epidermis inflammation and decreased mRNA expression and secretion of IL-33 in MC903-mediated AD mice without interfering with TSLP and IL-1β production. Our results demonstrate a novel ability of NLRP3 to function as a crucial transcription factor of IL-33 in epithelium independently of inflammasome that to mediate the pathological process of AD.

scholarly journals Role of NLRP3 inflammasome in the development of bladder pain syndrome interstitial cystitis

2019 ◽  
Vol 11 ◽  
pp. 175628721881803 ◽  
Author(s):  
Karol Borys Tudrej ◽  
Tomasz Piecha ◽  
Małgorzata Kozłowska-Wojciechowska
Keyword(s):  
Interstitial Cystitis ◽  
Nlrp3 Inflammasome ◽  
Pain Syndrome ◽  
Bladder Pain Syndrome ◽  
Receptor Protein ◽  
Inflammasome Activation ◽  
Bladder Epithelium ◽  
Bladder Pain ◽  
Bladder Inflammation ◽  
Nlrp3 Inflammasome Activation

Although it has been proposed that NOD-like receptor protein 3 (NLRP3) inflammasome activation may have an important contribution to the onset of bladder pain syndrome/interstitial cystitis (BPS/IC), as of today there is still insufficient evidence to accept or to reject this hypothesis. However, taking into consideration that inflammasomes have been already shown as important mediators of cyclophosphamide-induced bladder inflammation and that some studies have also revealed human bladder epithelium expresses high levels of NLRP3, such a hypothesis seems to be reasonable. The purpose of this review is to discuss a scenario that NLRP3 inflammasome is a crucial player in the development of this disease. Identification of a novel mediator of bladder inflammation and pain could lead to emerging new therapeutic strategy and the first causative therapy.

scholarly journals SARS-CoV-2 N promotes the NLRP3 inflammasome activation to induce hyperinflammation

2020 ◽  
Author(s):  
Pan Pan ◽  
Miaomiao Shen ◽  
Zhenyang Yu ◽  
Weiwei Ge ◽  
Keli Chen ◽  
...  
Keyword(s):  
Lung Injury ◽  
Nlrp3 Inflammasome ◽  
Cultured Cells ◽  
Inflammatory Responses ◽  
Pathological Process ◽  
Inflammasome Activation ◽  
N Protein ◽  
Distinct Mechanism ◽  
Nlrp3 Inflammasome Activation ◽  
Proinflammatory Responses

Abstract Excessive inflammatory responses induced upon SARS-CoV-2 infection interlocks with severe symptoms and acute lung injury in patients with Severe Coronavirus Disease 2019 (COVID-19). Revealing the mechanism underlying the control of SARS-CoV-2-triggered immune-inflammatory responses would help us to understand the pathological process and guide clinical treatment. However, the effect of the NLRP3 inflammasome on regulating SARS-CoV-2-induced inflammatory responses has not been reported. Here, we revealed a distinct mechanism by which SARS-CoV-2 nucleocapsid (N) protein promotes the NLRP3 inflammasome activation to induce hyperinflammation. We demonstrated that N protein facilitates the maturation of proinflammatory cytokines IL-1β and IL-6 and induces proinflammatory responses in cultured cells and mice tissues. In team of molecular mechanism, N protein interacts directly with NLRP3 protein, promotes the binding of NLRP3 with ASC, and facilitates the assemble of the inflammasome complex. More importantly, N protein aggravates lung injury, accelerated death in sepsis and acute inflammation mouse models, and promotes IL-1β and IL-6 activation in mice. Notably, N-induced lung injury and cytokine production were blocked by Ac-YVAD-cmk, an inhibitor of the NLRP3 inflammasome. Therefore, this study revealed a distinct mechanism by which SARS-CoV-2 N protein promotes the NLRP3 inflammasome activation and induces excessive inflammatory responses.

scholarly journals NLRP3 inflammasome activation contributes to remifentanil-induced postoperative hyperalgesia via regulation of NMDA receptor NR1 subunit phosphorylation and GLT-1

2020 ◽  
Author(s):  
Yuan Yuan ◽  
Chenxu Wang ◽  
Beibei Dong ◽  
Keliang Xie ◽  
Yonghao Yu
Keyword(s):  
Spinal Cord ◽  
Nmda Receptor ◽  
Nlrp3 Inflammasome ◽  
Receptor Protein ◽  
Inflammasome Activation ◽  
Remifentanil Infusion ◽  
Caspase 1 ◽  
Nlrp3 Inflammasome Activation ◽  
Behavioural Tests ◽  
Inflammasome Inhibitors

Abstract Background Although remifentanil provides perfect analgesia during operations, postoperative remifentanil-induced hyperalgesia (RIH) might be a challenge to anaesthetists. Increasingly, the NOD-like receptor protein 3 (NLRP3) signalling pathway are being implicated in the initiation and maintenance of these conditions. In the present work, we examined the hypothesis that NLRP3 inflammasome activation contributes to RIH via regulation of NMDA receptor NR1 subunit phosphorylation and glutamate transporter-1 (GLT-1) by interleukin-1β (IL-1β). Methods We first tested the changes in thermal and mechanical hyperalgesia at baseline (24 h before remifentanil infusion) and 2 h, 6 h, 24 h, and 48 h after remifentanil infusion in a rat model of incisional pain. Then, the expression of IL-1β and GLT-1 and phosphorylation of NMDA receptor NR1 subunits (Phospho-NR1) in the L4–L6 spinal cord segments were measured. Furthermore, we investigated the effects of IL-1ra, a selective IL-1β inhibitor, on behavioural tests of RIH and on the expression of GLT-1 and Phospho-NR1. In addition, we measured the expression of TLR4, P2X7R, NLRP3 and caspase-1, which are indicators of NLRP3 inflammasome activation. Finally, we investigated the effects of (+)-naloxone (a TLR4 inhibitor), A438079 (a P2X7R inhibitor) and ac-YVADcmk (a caspase-1 inhibitor), which are all selective NLRP3 inflammasome inhibitors, on behavioural tests of RIH and on the expression of IL-1β, GLT-1 and Phospho-NR1. Results The initiation and maintenance of RIH was mediated by a previously unidentified mechanism--namely, remifentanil-induced spinal NLRP3 inflammasome activation and the associated release of IL-1β. Remifentanil induced significant postoperative hyperalgesia, as indicated by behavioural tests, which were markedly improved by pretreatment with IL-1ra and NLRP3 inflammasome inhibitors. Moreover, remifentanil infusion decreased the expression of GLT-1 and increased Phospho-NR1 in the spinal cord, which were reversed by pretreatment with IL-1ra and NLRP3 inflammasome inhibitors. More importantly, remifentanil infusion increased IL-1β expression and activated NLRP3 inflammasomes, which were significantly attenuated by NLRP3 inflammasome inhibitors. Conclusion The above results suggest that NLRP3 inflammasome activation contributes to RIH via regulation of Phospho-NR1 and GLT-1 by IL-1β. Inhibition of NLRP3 inflammasome activation or IL-1β may be an effective and novel option for the treatment of RIH.

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