scholarly journals The Anti-Inflammatory Effects of Angiogenin in an Endotoxin Induced Uveitis in Rats

2020 ◽  
Vol 21 (2) ◽  
pp. 413
Author(s):  
Jihae Park ◽  
Jee Taek Kim ◽  
Soo Jin Lee ◽  
Jae Chan Kim
Keyword(s):  
Western Blot ◽  
Inflammatory Cytokines ◽  
Aqueous Humor ◽  
Rat Model ◽  
Inflammatory Responses ◽  
Inflammatory Cells ◽  
Ocular Tissue ◽  
Tnf Α ◽  
Anti Inflammatory

Angiogenin (ANG) is involved in the innate immune system and inflammatory disease. The aim of this study is to evaluate the anti-inflammatory effects of ANG in an endotoxin induced uveitis (EIU) rat model and the pathways involved. EIU rats were treated with balanced salt solution (BSS), a non-functional mutant ANG (mANG), or wild-type ANG (ANG). The integrity of the blood-aqueous barrier was evaluated by the infiltrating cell and protein concentrations in aqueous humor. Histopathology, Western blot, and real-time qRT-PCR of aqueous humor and ocular tissue were performed to analyze inflammatory cytokines and transcription factors. EIU treated with ANG had decreased inflammatory cells and protein concentrations in the anterior chamber. Compared to BSS and mANG, ANG treatment showed reduced expression of IL-1β, IL-8, TNF-α, and Myd88, while the expression of IL-4 and IL-10 was increased. Western blot of ANG treatment showed decreased expression of IL-6, inducible nitric oxide synthase (iNOS), IL-1β, TNF-α, and phosphorylated NF-κB and increased expression of IL-10. In conclusion, ANG seems to reduce effectively immune mediated inflammation in the EIU rat model by reducing the expression of proinflammatory cytokines, while increasing the expression of anti-inflammatory cytokines through pathways related to NF-κB. Therefore, ANG shows potential for effectively suppressing immune-inflammatory responses in vivo.

scholarly journals Punicalagin Prevents Inflammation in LPS-Induced RAW264.7 Macrophages by Inhibiting FoxO3a/Autophagy Signaling Pathway

Nutrients ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2794 ◽  
Author(s):  
Cao ◽  
Chen ◽  
Ren ◽  
Zhang ◽  
Tan ◽  
...  
Keyword(s):  
Western Blot ◽  
Signaling Pathway ◽  
Inflammatory Cytokines ◽  
Blot Analysis ◽  
Western Blot Analysis ◽  
Inflammatory Responses ◽  
Raw264.7 Macrophages ◽  
Tnf Α ◽  
Autophagy Inhibition ◽  
Pro Inflammatory Cytokines

Punicalagin, a hydrolysable tannin of pomegranate juice, exhibits multiple biological effects, including inhibiting production of pro-inflammatory cytokines in macrophages. Autophagy, an intracellular self-digestion process, has been recently shown to regulate inflammatory responses. In this study, we investigated the anti-inflammatory potential of punicalagin in lipopolysaccharide (LPS) induced RAW264.7 macrophages and uncovered the underlying mechanisms. Punicalagin significantly attenuated, in a concentration-dependent manner, LPS-induced release of NO and decreased pro-inflammatory cytokines TNF-α and IL-6 release at the highest concentration. We found that punicalagin inhibited NF-κB and MAPK activation in LPS-induced RAW264.7 macrophages. Western blot analysis revealed that punicalagin pre-treatment enhanced LC3II, p62 expression, and decreased Beclin1 expression in LPS-induced macrophages. MDC assays were used to determine the autophagic process and the results worked in concert with Western blot analysis. In addition, our observations indicated that LPS-induced releases of NO, TNF-α, and IL-6 were attenuated by treatment with autophagy inhibitor chloroquine, suggesting that autophagy inhibition participated in anti-inflammatory effect. We also found that punicalagin downregulated FoxO3a expression, resulting in autophagy inhibition. Overall these results suggested that punicalagin played an important role in the attenuation of LPS-induced inflammatory responses in RAW264.7 macrophages and that the mechanisms involved downregulation of the FoxO3a/autophagy signaling pathway.

scholarly journals In Vitro Evaluation of the Anti-Inflammatory Effect of KMUP-1 and in Vivo Analysis of Its Therapeutic Potential in Osteoarthritis

Biomedicines ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 615
Author(s):  
Shang-En Huang ◽  
Erna Sulistyowati ◽  
Yu-Ying Chao ◽  
Bin-Nan Wu ◽  
Zen-Kong Dai ◽  
...  
Keyword(s):  
Articular Cartilage ◽  
Inflammatory Responses ◽  
Therapeutic Potential ◽  
Antioxidant Properties ◽  
Serum Levels ◽  
Gene Expressions ◽  
Tnf Α ◽  
Anti Inflammatory

Osteoarthritis is a degenerative arthropathy that is mainly characterized by dysregulation of inflammatory responses. KMUP-1, a derived chemical synthetic of xanthine, has been shown to have anti-inflammatory and antioxidant properties. Here, we aimed to investigate the in vitro anti-inflammatory and in vivo anti-osteoarthritis effects of KMUP-1. Protein and gene expressions of inflammation markers were determined by ELISA, Western blotting and microarray, respectively. RAW264.7 mouse macrophages were cultured and pretreated with KMUP-1 (1, 5, 10 μM). The productions of TNF-α, IL-6, MMP-2 and MMP- 9 were reduced by KMUP-1 pretreatment in LPS-induced inflammation of RAW264.7 cells. The expressions of iNOS, TNF-α, COX-2, MMP-2 and MMP-9 were also inhibited by KMUP-1 pretreatment. The gene expression levels of TNF and COX families were also downregulated. In addition, KMUP-1 suppressed the activations of ERK, JNK and p38 as well as phosphorylation of IκBα/NF-κB signaling pathways. Furthermore, SIRT1 inhibitor attenuated the inhibitory effect of KMUP-1 in LPS-induced NF-κB activation. In vivo study showed that KMUP-1 reduced mechanical hyperalgesia in monoiodoacetic acid (MIA)-induced rats OA. Additionally, KMUP-1 pretreatment reduced the serum levels of TNF-α and IL-6 in MIA-injected rats. Moreover, macroscopic and histological observation showed that KMUP-1 reduced articular cartilage erosion in rats. Our results demonstrated that KMUP-1 inhibited the inflammatory responses and restored SIRT1 in vitro, alleviated joint-related pain and cartilage destruction in vivo. Taken together, KMUP-1 has the potential to improve MIA-induced articular cartilage degradation by inhibiting the levels and expression of inflammatory mediators suggesting that KMUP-1 might be a potential therapeutic agent for OA.

Abstract 553: Siglec-1 (CD169) on Monocytes/Macrophages: A New Receptor For Extracellular Self-RNA in Triggering Inflammatory Responses via the Sheddase TACE/ADAM17

2015 ◽  
Vol 35 (suppl_1) ◽  
Author(s):  
Hector A Cabrera-Fuentes ◽  
Klaus T Preissner ◽  
William A Boisvert
Keyword(s):  
Inflammatory Cytokines ◽  
Inflammatory Responses ◽  
Transmembrane Protein ◽  
Macrophage Polarization ◽  
Extracellular Rna ◽  
Tnf Α ◽  
M1 Phenotype ◽  
Phenotype Markers ◽  
Anti Inflammatory

As an important component of atherosclerosis, monocytes/macrophages respond to external stimuli with rapid changes in their expression of many inflammation-related genes to undergo polarization towards the M1 (pro-inflammatory) or M2 (anti-inflammatory) phenotype. Although sialoadhesin (Sn), also known as SIGLEC-1 or CD169, is a transmembrane protein receptor expressed on monocytes and macrophages whether it has a role in macrophage polarization and ultimately, macrophage-driven atherogenesis, has not been investigated. We have previously shown that, independently of Toll-like receptor signaling, extracellular RNA (eRNA) could exert pro-thrombotic and pro-inflammatory properties in the cardiovascular system by inducing cytokine mobilization. In the current study, recombinant mouse macrophage CSF[[Unable to Display Character: –]]driven bone marrow-derived macrophage (BMDM) differentiation was found to be skewed towards the M1 phenotype by exposure of cells to eRNA. This resulted in up-regulation of inflammatory markers, whereas anti-inflammatory genes were significantly down-regulated by eRNA. Interestingly, eRNA was released from BMDM under hypoxia and induced TNF-α liberation by activating TNF-α converting enzyme (TACE) to provoke inflammation. Conversely, TNF-α promoted eRNA release, especially under hypoxia, feeding a vicious cycle of cell damage. Administration of RNase1 or TAPI (a TACE-inhibitor) prevented the production of inflammatory mediators. Murine BMDM isolated from mice deficient in sialoadhesin had the opposite reaction to eRNA treatment with a prominent down-regulation of pro-inflammatory cytokines/M1 phenotype markers, while anti-inflammatory cytokines/M2 phenotype markers were significantly raised. In keeping with the proposed role of eRNA as a pro-inflammatory “alarm signal”, these data further shed light on the role of eRNA in macrophage function in the context of chronic inflammatory diseases such as atherosclerosis. The identification of sialoadhesin as putative eRNA recognition site on macrophages may allow further investigation of the underlying mechanisms of eRNA-macrophage interaction and related signal transduction pathways. Siglec-1 thereby may provides a new target to treat eRNA-mediated vascular diseases.

A novel fluorinated stilbene exerts hepatoprotective properties in CCl4-induced acute liver damage

2011 ◽  
Vol 89 (10) ◽  
pp. 759-766 ◽  
Author(s):  
Horacio Rivera ◽  
Martha S. Morales-Ríos ◽  
Wendy Bautista ◽  
Mineko Shibayama ◽  
Víctor Tsutsumi ◽  
...  
Keyword(s):  
Liver Damage ◽  
Inflammatory Responses ◽  
Acute Liver Damage ◽  
Tnf Α ◽  
Male Wistar Rats ◽  
Anti Inflammatory ◽  
Factor Α ◽  
Glutamyl Transpeptidase

There has been a recently increase in the development of novel stilbene-based compounds with in vitro anti-inflamatory properties. For this study, we synthesized and evaluated the anti-inflammatory properties of 2 fluorinated stilbenes on carbon tetrachloride (CCl4)-induced acute liver damage. To achieve this, CCl4 (4 g·kg–1, per os) was administered to male Wistar rats, followed by either 2-fluoro-4′-methoxystilbene (FME) or 2,3-difluoro-4′-methoxystilbene (DFME) (10 mg·kg–1, per os). We found that although both of the latter compounds prevented cholestatic damage (γ-glutamyl transpeptidase activity), only DFME showed partial but consistent results in the prevention of necrosis, as assessed by both alanine aminotransferase activity and histological analysis. Since inflammatory responses are mediated by cytokines, mainly tumour necrosis factor α (TNF-α), we used the Western blot technique to determine the action of FME and DFME on the expression level of this cytokine. The observed increase in the level of TNF-α caused by CCl4 administration was only prevented by treatment with DFME, in agreement with our biochemical findings. This result was confirmed by measuring interleukin-6 (IL-6) levels, since the expression of this protein depends on the level of TNF-α. In this case, DFME completely blocked the CCl4-induced increase of IL-6. Our results suggest that DFME possesses greater anti-inflammatory properties in vivo than FME. DFME constitutes a possible therapeutic agent for liver disease and could serve as a template for structure optimization.

scholarly journals Copper chelation by tetrathiomolybdate inhibits lipopolysaccharide-induced inflammatory responses in vivo

2011 ◽  
Vol 301 (3) ◽  
pp. H712-H720 ◽  
Author(s):  
Hao Wei ◽  
Balz Frei ◽  
Joseph S. Beckman ◽  
Wei-Jian Zhang
Keyword(s):  
Inflammatory Responses ◽  
Vascular Inflammation ◽  
Surrogate Marker ◽  
Transition Metal Ions ◽  
Intercellular Adhesion Molecule ◽  
Etiologic Factor ◽  
Copper Chelation ◽  
Tnf Α ◽  
Anti Inflammatory

Redox-active transition metal ions, such as iron and copper, may play an important role in vascular inflammation, which is an etiologic factor in atherosclerotic vascular diseases. In this study, we investigated whether tetrathiomolybdate (TTM), a highly specific copper chelator, can act as an anti-inflammatory agent, preventing lipopolysaccharide (LPS)-induced inflammatory responses in vivo. Female C57BL/6N mice were daily gavaged with TTM (30 mg/kg body wt) or vehicle control. After 3 wk, animals were injected intraperitoneally with 50 μg LPS or saline buffer and killed 3 h later. Treatment with TTM reduced serum ceruloplasmin activity by 43%, a surrogate marker of bioavailable copper, in the absence of detectable hepatotoxicity. The concentrations of both copper and molybdenum increased in various tissues, whereas the copper-to-molybdenum ratio decreased, consistent with reduced copper bioavailability. TTM treatment did not have a significant effect on superoxide dismutase activity in heart and liver. Furthermore, TTM significantly inhibited LPS-induced inflammatory gene transcription in aorta and heart, including vascular and intercellular adhesion molecule-1 (VCAM-1 and ICAM-1, respectively), monocyte chemotactic protein-1 (MCP-1), interleukin-6, and tumor necrosis factor (TNF)-α (ANOVA, P < 0.05); consistently, protein levels of VCAM-1, ICAM-1, and MCP-1 in heart were also significantly lower in TTM-treated animals. Similar inhibitory effects of TTM were observed on activation of nuclear factor-κB (NF-κB) and activator protein-1 (AP-1) in heart and lungs. Finally, TTM significantly inhibited LPS-induced increases of serum levels of soluble ICAM-1, MCP-1, and TNF-α (ANOVA, P < 0.05). These data indicate that copper chelation with TTM inhibits LPS-induced inflammatory responses in aorta and other tissues of mice, most likely by inhibiting activation of the redox-sensitive transcription factors, NF-κB and AP-1. Therefore, copper appears to play an important role in vascular inflammation, and TTM may have value as an anti-inflammatory or anti-atherogenic agent.

scholarly journals The effect of bitter gourd (Momordica charantia) ethanolic extract on inflammatory infiltrates and NF-κB activation in periodontitis

2019 ◽  
Vol 1 (1) ◽  
pp. 6
Author(s):  
Aryudhi Armis ◽  
Tetiana Haniastuti ◽  
Heni Susilowati
Keyword(s):  
Alveolar Bone ◽  
Inflammatory Responses ◽  
Ethanolic Extract ◽  
Inflammatory Cells ◽  
Momordica Charantia ◽  
Bitter Gourd ◽  
Tnf Α ◽  
Male Wistar Rats ◽  
Anti Inflammatory ◽  
Inflammatory Infiltrates

Periodontitis is a periodontal disease involving the gingiva, periodontal ligament, cementum, and alveolar bone due to an inflammatory process. Virulence factors of periodontopathogens and inflammatory responses in periodontitis can stimulate nuclear factor-kappa B (NF-κB) activity. Charantoside c and Momordicosides g in bitter gourd prevent NF-κB activation stimulated by TNF-α in HepG2 cells. This study aims to determine the effect of bitter gourd fruit (Momordica charantia) ethanolic extract as an anti-inflammatory substance on the level of inflammatory infiltrates and the number of cells that experience NF-κB activation in the periodontitis model. Eighty male Wistar rats were divided into 5 groups. The mandibular incisors were ligated for 14 days to induce periodontitis. Each group was given Momordica charantia extract of 500 mg/kg BW, 250 mg/kg BW, and 100 mg/kg BW; ibuprofen 100 mg/kg BW; and aquades orally using oral gavage on the day 14. Rat necropsy was carried out on day 1, 3, 5, and 7 after giving the substances. Taking out the lower jaw was done to make tissue preparations followed by staining them with hematoxylin eosin (HE). Immunohistochemicalanalysis was performed to observe cells that were positive for NF-κB activation. The results showed a decrease in the density of inflammatory infiltrates in all groups, except for those given aquades. The number of inflammatory cells ofneutrophils, macrophages, and lymphocytes that experienced NF-κB activation showed the most effective decrease in the group of Momordica charantia 500 mg/kg BW, on the 7th day. The conclusion of this study is that ethanolic extractof Momordica charantia has an anti-inflammatory effect and prevents the activation of NF-kB in rat gingival induced by periodontitis. The highest effect was found at a dose of 500 mg/kg BW on day 7 after giving of extracts.

scholarly journals Minimally Invasive Embedding of Saturated MSU Induces Persistent Gouty Arthritis in Modified Rat Model

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Han-Lin Xu ◽  
Sheng-Kun Li ◽  
Xiao-Ao Xue ◽  
Zi-Yi Chen ◽  
Ying-Hui Hua
Keyword(s):  
Minimally Invasive ◽  
Rat Model ◽  
Gouty Arthritis ◽  
Inflammatory Cells ◽  
Tnf Α ◽  
Quantitative Immunofluorescence ◽  
Invasive Method ◽  
Reproducible Method ◽  
Mechanical Pain Threshold

Introduction. Animal models are valid for in vivo research on the pathophysiological process and drug screening of gout arthritis. Intra-articular injection of monosodium urate (MSU) is the most common method, while stable MSU deposition enveloped by inflammatory cells was rarely reported. Objective. To develop a modified gouty arthritis rat model characterized by intra-articular MSU deposition and continuous joint pain with a minimally invasive method. Method. A total of twenty-four rats were randomly allocated into six groups. Three intervention groups of rats received intra-articular MSU embedment. Sham groups received pseudosurgeries with equal normal saline (NS). Gross parameters and pathological features of synovium harvested from anterior capsule were estimated. Mechanical pain threshold tests were conducted over a 96-hour period postoperatively. Moreover, quantitative immunofluorescence was conducted to assess tissue inflammation. Result. After MSU embedding, rats got more persistent arthritic symptoms as well as tissue MSU deposition. More significant synovial swelling was detected in the MSU group compared to sham groups ( P < 0.025 ). Behavioral tests showed that the embedding of MSU resulted in prolonged mechanical hyperalgesia during 2 hours to 96 hours postoperatively ( P < 0.05 ). MSU depositions enveloped by inflammatory cells that express IL-1β and TNF-α were detected in embedding groups. Quantitative immunofluorescence suggested that the frequencies of MSU interventions upregulated expression of proinflammatory factors including IL-1β and TNF-α ( P < 0.05 ). Conclusion. A minimally invasive method was developed to establish modified rat model of intra-articular MSU deposition. This model was proved to be a simple reproducible method to mimic the pathological characteristics of persistent gouty arthritis.

scholarly journals Diflunisal targets the HMGB1/CXCL12 heterocomplex and blocks immune cell recruitment

2019 ◽  
Author(s):  
Federica De Leo ◽  
Giacomo Quilici ◽  
Mario Tirone ◽  
Valeria Mannella ◽  
Francesco De Marchis ◽  
...  
Keyword(s):  
Rational Design ◽  
Immune Cell ◽  
Inflammatory Responses ◽  
Inflammatory Cells ◽  
Cell Recruitment ◽  
Redox States ◽  
Inflammatory Drugs ◽  
Anti Inflammatory

AbstractExtracellular HMGB1 triggers inflammation following infection or injury, and supports tumorigenesis in inflammation-related malignancies. HMGB1 has several redox states: reduced HMGB1 recruits inflammatory cells to injured tissues forming a heterocomplex with CXCL12 and signaling via its receptor CXCR4; disulfide-containing HMGB1 binds to TLR4 and promotes inflammatory responses. Here we show that Diflunisal, an aspirin-like nonsteroidal anti-inflammatory drug (NSAID) that has been in clinical use for decades, specifically inhibits in vitro and in vivo the chemotactic activity of HMGB1 at nanomolar concentrations, at least in part by binding directly to both HMGB1 and CXCL12 and disrupting their heterocomplex. Importantly, Diflunisal does not inhibit TLR4-dependent responses. Our findings clarify the mode of action of Diflunisal, and open the way to the rational design of functionally specific anti-inflammatory drugs.

scholarly journals Isoimperatorin exerts anti-inflammatory activity by targeting the LPS-TLR4/MD-2-NF-κB pathway

2021 ◽  
Vol 19 ◽  
pp. 205873922110005
Author(s):  
Guirong Chen ◽  
Yunong Liu ◽  
Yubin Xu ◽  
Mingbo Zhang ◽  
Song Guo ◽  
...  
Keyword(s):  
Molecular Docking ◽  
Real Time ◽  
Signaling Pathway ◽  
Western Blotting ◽  
Inflammatory Cytokines ◽  
Real Time Pcr ◽  
Inflammatory Responses ◽  
Inflammatory Activity ◽  
Tnf Α ◽  
Anti Inflammatory

Isoimperatorin (QHS) is a phytoconstituent found in the methanolic extracts obtained from the roots of Angelica dahurica, which contains anti-inflammatory, anti-bacterial, analgesic, anti-tumor, and vasodilatory activities. QHS possesses potent antagonistic activity against lipopolysaccharide (LPS)-induced inflammation; however, the mechanism of action remains unclear. In this study, we investigated the anti-inflammatory effect of QHS and explored the underlying mechanisms. The QHS was purchased from Jiangsu Yongjian Pharmaceutical Co., Ltd. (Jiangsu, China). We performed MTT assay, real-time PCR, ELISA, and western blotting experiments to assess the anti-inflammatory activity and the possible mechanism of QHS in vitro. Molecular docking was performed to study the binding of QHS and myeloid differentiation protein-2 (MD-2) and elucidate the possible anti-inflammatory mechanism. QHS had no significant effect on cell viability. Moreover, pre-treatment with QHS significantly decreased the release of inflammatory cytokines and mediators including NO, TNF-α, IL-6, and IL-1β. In addition, real-time PCR showed that QHS decreased the mRNA expressions of iNOS, COX-2 TNF-α, IL-6, and IL-1β. Western blotting indicated that QHS could inhibit the expression of the proteins associated with the LPS-TLR4/MD-2-NF-κB signaling pathway. Lastly, molecular docking revealed a possible binding mechanism between QHS and MD-2. QHS exhibited anti-inflammatory activity when combined with MD-2, regulating the LPS-TLR4/MD-2-NF-κB signaling pathway, and inhibiting the release and expression of inflammatory cytokines and mediators. Furthermore, QHS can be used as a potential TLR4 antagonist, which blocks MD-2 binding, for treating inflammatory responses induced by LPS.

scholarly journals The Anti-Inflammatory Effect of KS23, A Novel Peptide Derived From Globular Adiponectin, on Endotoxin-Induced Uveitis in Rats

2021 ◽  
Vol 11 ◽  
Author(s):  
Xin Shi ◽  
Shaopin Zhu ◽  
Huiyi Jin ◽  
Junwei Fang ◽  
Xindan Xing ◽  
...  
Keyword(s):  
Aqueous Humor ◽  
Nuclear Translocation ◽  
Raw 264.7 Cells ◽  
Therapeutic Effects ◽  
Raw 264.7 ◽  
Tnf Α ◽  
Globular Adiponectin ◽  
Anti Inflammatory

Purpose: Adiponectin has been shown to exert potent anti-inflammatory activities in a range of systemic inflammatory diseases. This study aimed to investigate the potential therapeutic effects of KS23, a globular adiponectin-derived peptide, on endotoxin-induced uveitis (EIU) in rats and lipopolysaccharide (LPS)-stimulated mouse macrophage-like RAW 264.7 cells.Methods: EIU was induced in Lewis rats by subcutaneous injection of LPS into a single footpad. KS23 or phosphate-buffered saline (PBS) was administered immediately after LPS induction via intravitreal injection. Twenty-four hours later, clinical and histopathological scores were evaluated, and the aqueous humor (AqH) was collected to determine the infiltrating cells, protein concentration, and levels of inflammatory cytokines. In vitro, cultured RAW 264.7 cells were stimulated with LPS in the presence or absence of KS23, inflammatory cytokine levels in the supernatant, nuclear translocation of nuclear factor kappa B (NF-κB) subunit p65, and the expression of NF-kB signaling pathway components were analyzed.Results: KS23 treatment significantly ameliorated the clinical and histopathological scores of EIU rats and reduced the levels of infiltration cells, protein, tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) in the aqueous humor. Consistently, KS23 decreased the expression of TNF-α and IL-6 in the supernatant of LPS-stimulated RAW 264.7 cells and inhibited the LPS-induced nuclear translocation of NF-κB p65 and the phosphorylation of IKKα/β/IκBα/NF-κB.Conclusion: The in vivo and in vitro results demonstrated the anti-inflammatory effects of the peptide KS23 and suggested that KS23 is a compelling, novel therapeutic candidate for the treatment of ocular inflammation.

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