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1.
Gastric Cancer ; 26(1): 82-94, 2023 01.
Artigo em Inglês | MEDLINE | ID: mdl-36125689

RESUMO

BACKGROUND: Gastric cancer (GC) is a common malignancy worldwide, with a major attribution to Helicobacter pylori. Interleukin (IL)-17A has been reported to be up-regulated in serum and tumor of GC patients, but the precise mechanisms underlying its involvement in gastric tumorigenesis are yet to be established. Here, we investigated the roles of IL-17A in the pathogenesis of H. pylori-induced GC. METHODS: GC was induced in IL-17A knockout (KO) and wild-type (WT) mice via N-methyl-N-nitrosourea (MNU) treatment and H. pylori infection. At 50 weeks after treatment, gastric tissues were examined by histopathology, immunohistochemistry, and immunoblot analyses. In vitro experiments on the human GC cell lines were additionally performed to elucidate the underlying mechanisms. RESULTS: Deletion of IL-17A suppressed MNU and H. pylori-induced gastric tumor development accompanied by a decrease in gastric epithelial cell growth, oxidative stress, and expression of gastric epithelial stem cells markers. In AGS cells, recombinant human IL-17A (rhIL-17A) inhibited apoptosis and G1/S phase transition arrest while promoting reactive oxygen species production, sphere formation ability of cancer stem cells (CSC), and expression of stemness-related genes. In addition, rhIL-17A induced expression of IL-17RC, leading to NF-κB activation and increased NADPH oxidase 1 (NOX1) levels. Inhibition of NOX1 with GKT136901 attenuated rhIL-17A-mediated elevation of GC cell growth, ROS generation, and CSC stemness. Clinically, IL-17RC expressions were significantly upregulated in human GC compared with normal gastric tissues. CONCLUSION: Our results suggest that IL-17A promotes gastric carcinogenesis, in part, by regulating IL-17RC/NF-κB/NOX1 pathway, supporting its potential as a target in human GC therapy.


Assuntos
Infecções por Helicobacter , Helicobacter pylori , Neoplasias Gástricas , Animais , Humanos , Camundongos , Carcinogênese/metabolismo , Células Epiteliais/metabolismo , Mucosa Gástrica/patologia , Infecções por Helicobacter/complicações , Infecções por Helicobacter/patologia , Helicobacter pylori/genética , Interleucina-17/metabolismo , NF-kappa B/metabolismo , Neoplasias Gástricas/patologia , Receptores de Interleucina-17/metabolismo
2.
Pharm Biol ; 60(1): 2040-2048, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36267048

RESUMO

CONTEXT: Chronic obstructive pulmonary disease (COPD) is a chronic inflammatory lung disease associated with respiratory symptoms and narrowing of airways. Gyeji-tang (GJT) is a traditional Asian medicine that has been used to relieve early-stage cold symptoms, headache, and chills. OBJECTIVE: We examined the effect and potential molecular action mechanism of GJT in a mouse model of COPD induced by cigarette smoke (CS) plus lipopolysaccharide (LPS). MATERIALS AND METHODS: COPD was induced in C57BL/6J mice via daily exposure to CS for 1 h for 8 weeks and intranasal administration of LPS on weeks 1, 3, 5, and 7. GJT (100 or 200 mg/kg) or roflumilast (5 mg/kg) was administrated daily for the final 4 weeks of COPD induction. RESULTS: Administration of GJT significantly suppressed the CS/LPS-induced increases in: the numbers of total cells and macrophages in bronchoalveolar lavage fluid; the expression levels of tumour necrosis factor-α, interleukin (IL)-6, IL-1ß, and IL-8; the activities (phosphorylation) of nuclear factor kappa B and signal transducer and activator of transcription 3; and the expression levels of the structural remodelling markers, transforming growth factor beta, matrix metallopeptidase (MMP)-7, and MMP-9. DISCUSSION AND CONCLUSIONS: These results demonstrate that GJT prevents the lung inflammation and airway remodelling induced by CS plus LPS exposure in mice, suggesting that GJT may have therapeutic potential for the treatment of COPD.


Assuntos
Fumar Cigarros , Doença Pulmonar Obstrutiva Crônica , Camundongos , Animais , Lipopolissacarídeos/toxicidade , Fator de Necrose Tumoral alfa/metabolismo , Fator de Transcrição STAT3/metabolismo , NF-kappa B/metabolismo , Metaloproteinase 9 da Matriz/metabolismo , Interleucina-8/metabolismo , Interleucina-8/farmacologia , Interleucina-8/uso terapêutico , Camundongos Endogâmicos C57BL , Doença Pulmonar Obstrutiva Crônica/induzido quimicamente , Pulmão , Nicotiana , Modelos Animais de Doenças , Anti-Inflamatórios/uso terapêutico , Fator de Crescimento Transformador beta/metabolismo
3.
J Med Primatol ; 50(6): 281-290, 2021 12.
Artigo em Inglês | MEDLINE | ID: mdl-34632579

RESUMO

BACKGROUND: The long-tailed macaque (Macaca fascicularis fascicularis) is an Old World species, which is one among the most commonly used monkeys for pharmaceutical research. However, most of the available background data are not suitable for good laboratory practice (GLP)-regulated drug safety tests because the current reverence value covers fewer indices than necessary. Therefore, in this study, historical data for preclinical safety test were collected and managed. METHODS: Twenty-five hematology, 20 clinical chemistry, 19 urine analysis, and 16 organ weights were evaluated in a drug safety test of 228 male and 140 female 2- to 4-year-old long-tailed macaques at the Korea Institute of Toxicology under GLP regulations. RESULTS: The absolute and relative count of lymphocyte, basophil, and large unstained cell were higher, whereas neutrophil was lower in male than in female monkeys. In serum biochemistry, IP, GGT, ALP, and TCHO of male were higher than female. CONCLUSION: Historical data suitable for preclinical safety analysis were determined.


Assuntos
Hematologia , Animais , Feminino , Macaca fascicularis , Masculino , Tamanho do Órgão , Valores de Referência
4.
Heliyon ; 10(3): e25045, 2024 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-38317961

RESUMO

Inhalation of polyhexamethylene guanidine phosphate (PHMG) can cause pulmonary fibrosis. Nicotinamide adenine dinucleotide phosphate (NADPH) oxidases (Nox) are enzymes that produce reactive oxygen species, which may be involved in tissue damage in various lung diseases. To investigate whether the Nox2 isoform of Nox is involved in the progression of PHMG-induced lung damage, we studied the contribution of Nox2 in PHMG-induced lung injury in Nox2-deficient mice. We treated wild-type (WT) and Nox2 knockout mice with a single intratracheal instillation of 1.1 mg/kg PHMG and sacrificed them after 14 days. We analyzed lung histopathology and the number of total and differential cells in the bronchoalveolar lavage fluid. In addition, the expressions of cytokines, chemokines, and profibrogenic genes were analyzed in the lung tissues. Based on our results, Nox2-deficient mice showed less PHMG-induced pulmonary damage than WT mice, as indicated by parameters such as body weight, lung weight, total cell count, cytokine and chemokine levels, fibrogenic mediator expression, and histopathological findings. These findings suggest that Nox2 may have the potential to contribute to PHMG-induced lung injury and serves as an essential signaling molecule in the development of PHMG-induced pulmonary fibrosis by regulating the expression of profibrogenic genes.

5.
Sci Rep ; 14(1): 5657, 2024 03 07.
Artigo em Inglês | MEDLINE | ID: mdl-38454018

RESUMO

Cerium oxide nanoparticles (CeO2 NPs, NM-212) are well-known for their catalytic properties and antioxidant potential, and have many applications in various industries, drug delivery, and cosmetic formulations. CeO2 NPs exhibit strong antimicrobial activity and can be used to efficiently remove pathogens from different environments. However, knowledge of the toxicological evaluation of CeO2 NPs is too limited to support their safe use. In this study, CeO2 NPs were orally administered to Sprague Dawley rats for 13 weeks at the doses of 0, 10, 100, and 1000 mg/kg bw/day, followed by a four week recovery period. The hematology values for the absolute and relative reticulocyte counts in male rats treated with 1000 mg/kg bw/day CeO2 NPs were lower than those in control rats. The clinical chemistry values for sodium and chloride in the treated male rat groups (100 and 1000 mg/kg/day) and total protein and calcium in the treated female rat groups (100 mg/kg/day) were higher than those in the control groups. However, these changes were not consistent in both sexes, and no abnormalities were found in the corresponding pathological findings. The results showed no adverse effects on any of the parameters assessed. CeO2 NPs accumulated in the jejunum, colon, and stomach wall of rats administered 1000 mg/kg CeO2 NPs for 90 days. However, these changes were not abnormal in the corresponding histopathological and immunohistochemical examinations. Therefore, 1000 mg/kg bw/day may be considered the "no observed adverse effect level" of CeO2 NPs (NM-212) in male and female SD rats under the present experimental conditions.


Assuntos
Cério , Nanopartículas Metálicas , Nanopartículas , Ratos , Masculino , Feminino , Animais , Ratos Sprague-Dawley , Nanopartículas/química , Cério/toxicidade , Cério/química , Sistemas de Liberação de Medicamentos , Nanopartículas Metálicas/toxicidade , Nanopartículas Metálicas/química
6.
PLoS One ; 18(2): e0280438, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-36730319

RESUMO

Feline hypertrophic cardiomyopathy (HCM) is a common heart disease affecting 10-15% of all cats. Cats with HCM exhibit breathing difficulties, lethargy, and heart murmur; furthermore, feline HCM can also result in sudden death. Among various methods and indices, radiography and ultrasound are the gold standards in the diagnosis of feline HCM. However, only 75% accuracy has been achieved using radiography alone. Therefore, we trained five residual architectures (ResNet50V2, ResNet152, InceptionResNetV2, MobileNetV2, and Xception) using 231 ventrodorsal radiographic images of cats (143 HCM and 88 normal) and investigated the optimal architecture for diagnosing feline HCM through radiography. To ensure the generalizability of the data, the x-ray images were obtained from 5 independent institutions. In addition, 42 images were used in the test. The test data were divided into two; 22 radiographic images were used in prediction analysis and 20 radiographic images of cats were used in the evaluation of the peeking phenomenon and the voting strategy. As a result, all models showed > 90% accuracy; Resnet50V2: 95.45%; Resnet152: 95.45; InceptionResNetV2: 95.45%; MobileNetV2: 95.45% and Xception: 95.45. In addition, two voting strategies were applied to the five CNN models; softmax and majority voting. As a result, the softmax voting strategy achieved 95% accuracy in combined test data. Our findings demonstrate that an automated deep-learning system using a residual architecture can assist veterinary radiologists in screening HCM.


Assuntos
Cardiomiopatias , Cardiomiopatia Hipertrófica , Doenças do Gato , Aprendizado Profundo , Cardiopatias , Gatos , Animais , Cardiomiopatia Hipertrófica/diagnóstico por imagem , Cardiomiopatia Hipertrófica/veterinária , Ultrassonografia , Doenças do Gato/diagnóstico por imagem
7.
J Wildl Dis ; 58(2): 421-424, 2022 04 01.
Artigo em Inglês | MEDLINE | ID: mdl-35015076

RESUMO

Fatal systemic infection by Clostridium tarantellae in a wild Korean raccoon dog (Nyctereutes procyonoides koreensis) was diagnosed based on histopathology, immunofluorescence, PCR, and microbiome taxonomic profiling. Pathologic features were similar to Tyzzer's disease caused by C. piliforme. This is the first report of C. tarantellae infection in Korean raccoon dogs.


Assuntos
Cães Guaxinins , Guaxinins , Animais , Clostridium , República da Coreia
8.
Artigo em Inglês | MEDLINE | ID: mdl-35035511

RESUMO

BACKGROUND: Chronic obstructive pulmonary disease (COPD) refers to a lung disorder associated with symptoms of dyspnea, cough, and sputum production. Traditionally, Yijin-tang (YJT), a mixture of Pinellia ternate, Poria cocos, ginger, Chinese liquorice, and tangerine peel, has been prescribed for the treatment of respiratory system diseases caused by dampness phlegm. This experiment investigated the therapeutic effect of YJT in a mouse model of cigarette smoke (CS)- and lipopolysaccharide (LPS)-induced COPD. METHODS: COPD was induced by exposing mice to CS for 1 hour per day for 8 weeks, with intranasal delivery of LPS on weeks 1, 3, 5, and 7. YJT was administered at doses of 100 and 200 mg/kg 1 hour before CS exposure for the last 4 weeks. RESULTS: YJT significantly suppressed CS- and LPS-induced increases in inflammatory cell counts and reduced interleukin-1 beta (IL-1ß), IL-6, tumor necrosis factor-alpha (TNF-α), and monocyte chemoattractant protein-1 (MCP-1) levels in bronchoalveolar lavage fluid (BALF) and lung tissue. In addition, YJT not only decreased airway wall thickness, average alveolar intercept, and lung fibrosis, but it also suppressed the expression of matrix metallopeptidase (MMP)-7, MMP-9, and transforming growth factor-B (TGF-ß) and collagen deposition. Moreover, YJT suppressed phosphorylation of nuclear factor-kappa B (NF-κB) as well as expression of cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS). CONCLUSION: Collectively, our findings show that YJT attenuates respiratory inflammation and airway remodeling caused by CS and LPS exposure; therefore, therapeutic applications in COPD can be considered.

9.
Artigo em Inglês | MEDLINE | ID: mdl-34630623

RESUMO

The flavonoid myricetin is abundant in vegetables and has various bioactive properties, including anti-inflammatory and antioxidative activities. In the present study, we explored the effects of myricetin on alcohol-induced gastric ulcer in a rat model. To induce gastric ulcer, absolute ethanol (5 mL/kg body weight) was orally administrated to each rat. The positive control and myricetin-treated groups were given oral doses of omeprazole (20 mg/kg) or myricetin (12 mg/kg), respectively, 1 hour prior to the administration of absolute alcohol. We found that pretreatment with myricetin significantly decreased alcohol-induced gastric ulcer, hemorrhage, hyperemia, and epithelial cell loss in the gastric mucosa. Myricetin pretreatment reduced the level of malondialdehyde (MDA) and increased that of total glutathione (GSSG/GSH) and superoxide dismutase (SOD) in gastric tissues. In addition, it elevated the expression levels of cyclooxygenase-1 (COX-1) and prostaglandin E2 (PGE2) and decreased the phosphorylation of nuclear factor kappa B (NF-κB). Together, these results indicate that myricetin effectively inhibits ethanol-induced acute gastric injury by preventing oxidative damage, stimulating PGE2 production, and inhibiting NF-κB activation. We suggest that myricetin may be an alternative treatment for gastric injury caused by alcohol intake.

10.
Drug Deliv ; 28(1): 2268-2277, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34668836

RESUMO

Intratympanic (IT) therapies have been explored to address several side effects that could be caused by systemic administration of steroids to treat inner ear diseases. For effective drug delivery to the inner ear, an IT delivery system was developed using poly(lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) and thermosensitive gels to maintain sustained release. Dexamethasone (DEX) was used as a model drug. The size and zeta potential of PLGA NPs and the gelation time of the thermosensitive gel were measured. In vitro drug release was studied using a Franz diffusion cell. Cytotoxicity of the formulations was investigated using SK-MEL-31 cells. Inflammatory responses were evaluated by histological observation of spiral ganglion cells and stria vascularis in the mouse cochlea 24 h after IT administration. In addition, the biodistribution of the formulations in mouse ears was observed by fluorescence imaging using coumarin-6. DEX-NPs showed a particle size of 150.0 ± 3.2 nm in diameter and a zeta potential of -18.7 ± 0.6. The DEX-NP-gel showed a gelation time of approximately 64 s at 37 °C and presented a similar release profile and cytotoxicity as that for DEX-NP. Furthermore, no significant inflammatory response was observed after IT administration. Fluorescence imaging results suggested that DEX-NP-gel sustained release compared to the other formulations. In conclusion, the PLGA NP-loaded thermosensitive gel may be a potential drug delivery system for the inner ear.


Assuntos
Anti-Inflamatórios/farmacologia , Dexametasona/farmacologia , Doenças do Labirinto/tratamento farmacológico , Nanopartículas/química , Copolímero de Ácido Poliláctico e Ácido Poliglicólico/química , Animais , Anti-Inflamatórios/administração & dosagem , Anti-Inflamatórios/farmacocinética , Sobrevivência Celular , Química Farmacêutica , Dexametasona/administração & dosagem , Dexametasona/farmacocinética , Portadores de Fármacos/química , Liberação Controlada de Fármacos , Estabilidade de Medicamentos , Hidrogéis/química , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Tamanho da Partícula , Propriedades de Superfície
11.
BMC Complement Med Ther ; 21(1): 281, 2021 Nov 16.
Artigo em Inglês | MEDLINE | ID: mdl-34784929

RESUMO

BACKGROUND: Palmijihwanghwan (PJH) is a traditional medicine and eight constituents derived from PJH possess anti-inflammatory activities. However, the scientific evidence for its potential as a therapeutic agent for inflammatory lung disease has not yet been studied. In this study, we examined the protective effect of PJH in a mouse model of chronic obstructive pulmonary disease (COPD) induced by cigarette smoke (CS) with lipopolysaccharide (LPS). METHODS: Mice received CS exposure for 8 weeks and intranasal instillation of LPS on weeks 1, 3, 5 and 7. PJH (100 and 200 mg/kg) was administrated daily 1 h before CS treatment for the last 4 weeks. RESULTS: Compared with CS plus LPS-exposed mice, mice in the PJH-treated group showed significantly decreased inflammatory cells count and reduced inflammatory cytokines including interleukin-1 beta (IL-1ß), IL-6 and tumor necrosis factor alpha (TNF-α) levels in broncho-alveolar lavage fluid (BALF) and lung tissue. PJH also suppressed the phosphorylation of nuclear factor kappa B (NF-κB) and extracellular signal-regulated kinase1/2 (ERK1/2) caused by CS plus LPS exposure. Furthermore, CS plus LPS induced increases in matrix metallopeptidase (MMP)-7, MMP-9, and transforming growth factor-ß (TGF-ß) expression and collagen deposition that were inhibited in PJH-treated mice. CONCLUSIONS: This study demonstrates that PJH prevents respiratory inflammation and airway remodeling caused by CS with LPS exposure suggesting potential therapy for the treatment of COPD.


Assuntos
Anti-Inflamatórios/farmacologia , Medicina Tradicional Chinesa/métodos , Extratos Vegetais/farmacologia , Doença Pulmonar Obstrutiva Crônica/tratamento farmacológico , Animais , Modelos Animais de Doenças , Lipopolissacarídeos/efeitos adversos , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Doença Pulmonar Obstrutiva Crônica/etiologia , Poluição por Fumaça de Tabaco/efeitos adversos
12.
J Ethnopharmacol ; 255: 112779, 2020 Jun 12.
Artigo em Inglês | MEDLINE | ID: mdl-32209388

RESUMO

ETHNOPHARMACOLOGICAL RELEVANCE: Asteris Radix et Rhizoma (AR) refers to the roots and rhizomes of Aster tataricus L., which is widely distributed throughout East Asia. AR has been consumed as a traditional medicine in Korea, Japan and China for the treatment of urologic symptoms. To date, however, the therapeutic effect of AR on benign prostatic hyperplasia (BPH) has not been investigated. AIM OF THE STUDY: The present study evaluated the therapeutic effects of AR on a testosterone-induced BPH rats. MATERIALS AND METHODS: We induced BPH to rats by subcutaneous injections (s.c) of testosterone propionate (TP) daily for four weeks. Rats were also administered daily oral gavage of AR (150 mg/kg) or vehicle. After four weeks of induction, all animals were euthanized humanely and their prostate glands were removed, weighed and processed for further analysis, including histopathological examination, real-time PCR, terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay and Western blot analysis. RESULTS: Administration of AR to TP-induced BPH rats considerably reduced prostate weight and concentrations of serum testosterone and prostate dihydrotestosterone (DHT). Epithelial thickness and expression of proliferating cell nuclear antigen (PCNA) were markedly suppressed by AR-treatment in the rats. Furthermore, the expression of the B-cell lymphoma 2 (Bcl-2) were reduced and expression of the Bcl-2-associated X protein (Bax) increased, resulting in significant reduction in Bcl-2/Bax ratio. In addition, AR decreased the level of pro-inflammatory cytokines, including interleukin-1ß (IL-1ß), interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α). The expression of cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) were reduced by AR treatment in a TP-induced BPH rat model. CONCLUSIONS: AR alleviates BPH by promoting apoptosis and suppressing inflammation, indicating that AR may be used clinically to treat BPH accompanied by inflammation.


Assuntos
Anti-Inflamatórios/farmacologia , Apoptose/efeitos dos fármacos , Aster , Extratos Vegetais/farmacologia , Raízes de Plantas , Próstata/efeitos dos fármacos , Hiperplasia Prostática/prevenção & controle , Rizoma , Propionato de Testosterona , Animais , Anti-Inflamatórios/isolamento & purificação , Proteínas Reguladoras de Apoptose/metabolismo , Aster/química , Proliferação de Células/efeitos dos fármacos , Citocinas/metabolismo , Modelos Animais de Doenças , Mediadores da Inflamação/metabolismo , Masculino , Tamanho do Órgão , Extratos Vegetais/isolamento & purificação , Raízes de Plantas/química , Próstata/metabolismo , Próstata/patologia , Hiperplasia Prostática/induzido quimicamente , Hiperplasia Prostática/metabolismo , Hiperplasia Prostática/patologia , Ratos Sprague-Dawley , Rizoma/química
13.
J Ethnopharmacol ; 233: 115-122, 2019 Apr 06.
Artigo em Inglês | MEDLINE | ID: mdl-30508623

RESUMO

ETHNOPHARMACOLOGICAL RELEVANCE: Ulmus macrocarpa Hance (UMH), of the family Ulmaceae, is a deciduous tree, widely distributed throughout Korea. UMH has been used as a traditional oriental medicine in Korea for the treatment of urological disorders, including bladder outlet obstruction (BOO), lower urinary tract syndrome (LUTS), diuresis, and hematuria. To date, its possible protective effects against benign prostatic hyperplasia (BPH) have not been analyzed. AIM OF THE STUDY: This study investigated the effects of UMH on the development of BPH using a rat model of testosterone propionate (TP)-induced BPH. MATERIALS AND METHODS: BPH was induced by daily subcutaneous injections of testosterone propionate (TP) for four weeks. UMH was administrated daily by oral gavage at a dose of 150 mg/kg during the four weeks of TP injections. Animals were sacrificed, and their prostates were weighed and subjected to histopathological examination, TUNEL assay, and western blot analysis. RESULTS: Treatment of BPH-model rats with UMH significantly reduced prostate weight, serum testosterone concentration and dihydrotestosterone (DHT) concentration in prostate tissue. TP-induced prostatic hyperplasia and the expression of proliferating cell nuclear antigen (PCNA) were significantly attenuated in UMH-treated rats. In addition, UMH administration markedly induced the activation of caspases-3, - 8, and - 9 in prostate tissues of BPH rats, accompanied by upregulation of expression of Fas, Fas-associated protein with death domain (FADD), and Fas ligand (FasL) and a reduction in the ratio of B-cell lymphoma 2 (Bcl-2) to Bcl-2-associated X protein (Bax). CONCLUSIONS: UMH effectively inhibited the proliferation and promoted the apoptosis of prostate cells, suggesting it may be useful for the treatment of BPH.


Assuntos
Extratos Vegetais/uso terapêutico , Hiperplasia Prostática/tratamento farmacológico , Ulmus , Animais , Apoptose/efeitos dos fármacos , Di-Hidrotestosterona/metabolismo , Masculino , Fitoterapia , Extratos Vegetais/farmacologia , Próstata/efeitos dos fármacos , Próstata/patologia , Próstata/fisiologia , Hiperplasia Prostática/induzido quimicamente , Hiperplasia Prostática/metabolismo , Hiperplasia Prostática/patologia , Ratos Sprague-Dawley , Testosterona/sangue , Propionato de Testosterona
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