Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 173
Filtrar
Mais filtros

Bases de dados
País/Região como assunto
Tipo de documento
Intervalo de ano de publicação
1.
FASEB J ; 38(10): e23669, 2024 May 31.
Artigo em Inglês | MEDLINE | ID: mdl-38747734

RESUMO

Amomum xanthioides (AX) has been used as an edible herbal medicine to treat digestive system disorders in Asia. Additionally, Lactobacillus casei is a well-known probiotic commonly used in fermentation processes as a starter. The current study aimed to investigate the potential of Lactobacillus casei-fermented Amomum xanthioides (LAX) in alleviating metabolic disorders induced by high-fat diet (HFD) in a mouse model. LAX significantly reduced the body and fat weight, outperforming AX, yet without suppressing appetite. LAX also markedly ameliorated excessive lipid accumulation and reduced inflammatory cytokine (IL-6) levels in serum superior to AX in association with UCP1 activation and adiponectin elevation. Furthermore, LAX noticeably improved the levels of fasting blood glucose, serum insulin, and HOMA-IR through positive regulation of glucose transporters (GLUT2, GLUT4), and insulin receptor gene expression. In conclusion, the fermentation of AX demonstrates a pronounced mitigation of overnutrition-induced metabolic dysfunction, including hyperlipidemia, hyperglycemia, hyperinsulinemia, and obesity, compared to non-fermented AX. Consequently, we proposed that the fermentation of AX holds promise as a potential candidate for effectively ameliorating metabolic disorders.


Assuntos
Amomum , Dieta Hiperlipídica , Fermentação , Lacticaseibacillus casei , Obesidade , Animais , Dieta Hiperlipídica/efeitos adversos , Camundongos , Obesidade/metabolismo , Masculino , Lacticaseibacillus casei/metabolismo , Amomum/química , Camundongos Endogâmicos C57BL , Probióticos/farmacologia , Proteína Desacopladora 1/metabolismo , Resistência à Insulina , Camundongos Obesos , Adiponectina/metabolismo , Insulina/metabolismo , Insulina/sangue , Glicemia/metabolismo
2.
Am J Gastroenterol ; 119(4): 655-661, 2024 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-37975609

RESUMO

INTRODUCTION: Whether 10-day short-course vonoprazan-amoxicillin dual therapy (VA-dual) is noninferior to the standard 14-day bismuth-based quadruple therapy (B-quadruple) against Helicobacter pylori eradication has not been determined. This trial aimed to compare the eradication rate, adverse events, and compliance of 10-day VA-dual regimen with standard 14-day B-quadruple regimen as first-line H. pylori treatment. METHODS: This prospective randomized clinical trial was performed at 3 institutions in eastern China. A total of 314 treatment-naive, H. pylori -infected patients were randomly assigned in a 1:1 ratio to either 10-day VA-dual group or 14-day B-quadruple group. Eradication success was determined by 13 C-urea breath test at least 4 weeks after treatment. Eradication rates, adverse events, and compliance were compared between groups. RESULTS: Eradication rates of VA-dual and B-quadruple groups were 86.0% and 89.2% ( P = 0.389), respectively, by intention-to-treat (ITT) analysis; 88.2% and 91.5% ( P = 0.338), respectively, by modified ITT analysis; and 90.8% and 91.3% ( P = 0.884), respectively, by per-protocol (PP) analysis. The efficacy of the VA-dual remained noninferior to B-quadruple therapy in all ITT, modified ITT, and PP analyses. The incidence of adverse events in the VA-dual group was significantly lower compared with that in the B-quadruple group ( P < 0.001). Poor compliance contributed to eradication failure in the VA-dual group ( P < 0.001), while not in the B-quadruple group ( P = 0.110). DISCUSSION: The 10-day VA-dual therapy provided satisfactory eradication rates of >90% (PP analysis) and lower rates of adverse events compared with standard 14-day B-quadruple therapy as first-line H. pylori therapy. TRAIL REGISTRATION NUMBER: ChiCTR2300070100.


Assuntos
Infecções por Helicobacter , Helicobacter pylori , Pirróis , Sulfonamidas , Humanos , Amoxicilina/uso terapêutico , Bismuto/uso terapêutico , Bismuto/efeitos adversos , Antibacterianos , Infecções por Helicobacter/tratamento farmacológico , Estudos Prospectivos , Quimioterapia Combinada , Adesão à Medicação , Resultado do Tratamento , Inibidores da Bomba de Prótons/efeitos adversos
3.
BMC Anesthesiol ; 24(1): 174, 2024 May 14.
Artigo em Inglês | MEDLINE | ID: mdl-38745175

RESUMO

BACKGROUND: Compared to midazolam, remimazolam has a faster onset and offset of hypnotic effect, as well as cardiorespiratory stability, this study aims to determine the 90% effective dose (ED90) of remimazolam to inhibit responses to insertion of a duodenoscope during endoscopic retrograde cholangiopancreatography (ERCP). METHODS: A dose-response study was carried out undergoing ERCP who received remimazolam-alfentanil anesthesia using 10 µg/kg of alfentanil between September 2021 and November 2021. The initial dose of remimazolam was 0.2 mg/kg. The dose was then decided based on the responses of earlier patients by exploiting the sequential ascend and descend according to a 9: 1 biased coin design. Upon failure, the dose of remimazolam was increased by 0.025 mg/kg in the next patient. When the insertion was successful, the succeeding patient was randomized to an identical dose or a dose that was lower by 0.025 mg/kg.The ED90 of remimazolam for inhibiting responses to the insertion of a duodenoscope during ERCP was calculated. Adverse events and complications of remimazolam were recorded. RESULTS: A total of 55 elderly patients (age > 65) were included in the study. 45 successfully anesthetized patients, and 10 unsuccessfully. The ED90 of remimazolam was 0.300 mg/kg (95% CI = 0.287-0.320). ED95 was 0.315 (95% CI = 0.312-0.323) and ED99 was 0.323 (95% CI = 0.323-0.325). Among the patients, 9 patients developed hypotension, 2 patients developed bradycardia and 1 patient developed tachycardia, and hypoxia occurred in 2 patients. CONCLUSIONS: A loading dose of 0.300 mg / kg of remimazolam for elderly patients undergoing ERCP can safely, effectively, and quickly induce patients to fall asleep and inhibit responses to the insertion of a duodenoscope. TRIAL REGISTRATION: The study protocol was registered at the website ClinicalTrials.gov on 22/09/2021(NCT05053763).


Assuntos
Colangiopancreatografia Retrógrada Endoscópica , Relação Dose-Resposta a Droga , Duodenoscópios , Hipnóticos e Sedativos , Humanos , Colangiopancreatografia Retrógrada Endoscópica/métodos , Masculino , Feminino , Hipnóticos e Sedativos/administração & dosagem , Idoso , Alfentanil/administração & dosagem , Pessoa de Meia-Idade , Benzodiazepinas/administração & dosagem
4.
Int J Mol Sci ; 24(2)2023 Jan 13.
Artigo em Inglês | MEDLINE | ID: mdl-36675101

RESUMO

Sepsis leads to multi-organ failure due to aggressive systemic inflammation, which is one of the main causes of death clinically. This study aimed to evaluate whether ginseng sprout extracts (GSE) can rescue sepsis and explore its underlying mechanisms. C57BL/6J male mice (n = 15/group) were pre-administered with GSE (25, 50, and 100 mg/kg, p.o) for 5 days, and a single injection of lipopolysaccharide (LPS, 30 mg/kg, i.p) was administered to construct a sepsis model. Additionally, RAW264.7 cells were treated with LPS with/without GSE/its main components (Rd and Re) to explain the mechanisms corresponding to the animal-derived effects. LPS injection led to the death of all mice within 38 h, while GSE pretreatment delayed the time to death. GSE pretreatment also notably ameliorated LPS-induced systemic inflammation such as histological destruction in both the lung and liver, along with reductions in inflammatory cytokines, such as TNF-α, IL-6, and IL-1ß, in both tissues and serum. Additionally, GSE markedly diminished the drastic secretion of nitric oxide (NO) by suppressing the expression levels of inducible nitric oxide synthase (iNOS) and cyclooxygenase 2 (COX2) in both tissues. Similar changes in TNF-α, IL-1ß, NO, iNOS, and COX2 were observed in LPS-stimulated RAW264.7 cells, and protein expression data and nuclear translocation assays suggested GSE could modulate LPS-binding protein (LBP), Toll-like receptor 4 (TLR4), and NF-κB. Ginsenoside Rd could be a major active component in GSE that produces the anti-sepsis effects. Our data support that ginseng sprouts could be used as an herbal resource to reduce the risk of sepsis. The corresponding mechanisms may involve TLR4/NF-κB signaling and a potentially active component.


Assuntos
NF-kappa B , Panax , Extratos Vegetais , Sepse , Animais , Masculino , Camundongos , Ciclo-Oxigenase 2/metabolismo , Inflamação/induzido quimicamente , Inflamação/tratamento farmacológico , Inflamação/genética , Inflamação/metabolismo , Lipopolissacarídeos/efeitos adversos , Camundongos Endogâmicos C57BL , NF-kappa B/metabolismo , Óxido Nítrico Sintase Tipo II/metabolismo , Panax/metabolismo , Receptor 4 Toll-Like/metabolismo , Fator de Necrose Tumoral alfa/metabolismo , Sepse/tratamento farmacológico , Sepse/genética , Sepse/metabolismo , Extratos Vegetais/uso terapêutico , Fitoterapia , Plântula
5.
Int J Mol Sci ; 24(5)2023 Mar 02.
Artigo em Inglês | MEDLINE | ID: mdl-36902303

RESUMO

Osteoporosis is a metabolic skeletal disease characterized by lowered bone mineral density and quality, which lead to an increased risk of fracture. The aim of this study was to evaluate the anti-osteoporosis effects of a mixture (called BPX) of Cervus elaphus sibiricus and Glycine max (L.) Merrill and its underlying mechanisms using an ovariectomized (OVX) mouse model. BALB/c female mice (7 weeks old) were ovariectomized. From 12 weeks of ovariectomy, mice were administered BPX (600 mg/kg) mixed in a chow diet for 20 weeks. Changes in bone mineral density (BMD) and bone volume (BV), histological findings, osteogenic markers in serum, and bone formation-related molecules were analyzed. Ovariectomy notably decreased the BMD and BV scores, while these were significantly attenuated by BPX treatment in the whole body, femur, and tibia. These anti-osteoporosis effects of BPX were supported by the histological findings for bone microstructure from H&E staining, increased activity of alkaline phosphatase (ALP), but a lowered activity of tartrate-resistant acid phosphatase (TRAP) in the femur, along with other parameters in the serum, including TRAP, calcium (Ca), osteocalcin (OC), and ALP. These pharmacological actions of BPX were explained by the regulation of key molecules in the bone morphogenetic protein (BMP) and mitogen-activated protein kinase (MAPK) pathways. The present results provide experimental evidence for the clinical relevance and pharmaceutical potential of BPX as a candidate for anti-osteoporosis treatment, especially under postmenopausal conditions.


Assuntos
Doenças Ósseas Metabólicas , Osteoporose , Feminino , Camundongos , Animais , Humanos , Osteogênese , Glycine max/metabolismo , Doenças Ósseas Metabólicas/metabolismo , Osteoporose/metabolismo , Densidade Óssea , Modelos Animais de Doenças , Fosfatase Alcalina/metabolismo , Ovariectomia
6.
Zhonghua Nan Ke Xue ; 28(12): 1080-1088, 2022 Dec.
Artigo em Zh | MEDLINE | ID: mdl-37846627

RESUMO

OBJECTIVE: To analyze the clinicopathological and imaging features of primary squamous cell carcinoma of the prostate (PSCC) and provide some new ideas for exploring suitable diagnostic and treatment strategies for the disease. METHODS: We retrieved and analyzed the studies published at home and abroad between 1976 and 2022 and reviewed the clinical data of our Department of Medical Oncology on 70 cases of PSCC, as well as the survival statistics of another 58 cases. RESULTS: Clinically, PSCC was characterized by normal PSA and increased squamous cell carcinoma antigen. Overall survival of the patients was evidently correlated to the PSCC stage, chemotherapy and radiotherapy, significantly longer in those treated by chemotherapy with platinum than in those without platinum (P = 0.001). Univariate analysis suggested that the overall survival of the patients was significantly correlated with chemotherapy. CONCLUSION: PSCC has a poor prognosis. A deep insight into the clinical characteristics of PSCC is important for timely detection and suitable treatment of the malignancy.


Assuntos
Carcinoma de Células Escamosas , Próstata , Masculino , Humanos , Prognóstico , Próstata/patologia , Platina , Carcinoma de Células Escamosas/diagnóstico , Carcinoma de Células Escamosas/terapia
7.
FASEB J ; 34(6): 8686-8701, 2020 06.
Artigo em Inglês | MEDLINE | ID: mdl-32356337

RESUMO

Thyroid hormones are essential for the regulation of energy homeostasis and metabolic processes. However, the relationship between thyroid function and host gut microbial communities is not properly understood. To determine whether and how gut microbiota is associated with thyroid function, metagenomics analysis of the bacterial population in fecal samples of rat models of hyperthyroidism (induced by levothyroxine) and hypothyroidism (induced by propylthiouracil or thyroidectomy) was conducted through 16S rRNA gene sequencing. Our results revealed that all thyroid dysfunction models were definitely established and gut microbial composition varied according to different thyroid functional status. The relative abundance of Ruminococcus was significantly higher in the hyperthyroidism group (HE) vs both the normal and hypothyroidism groups (HO) while S24-7 was significantly higher in the HO group. The population of Prevotellaceae and Prevotella were significantly lower in the HO group vs the normal. Firmicutes and Oscillospira were significantly higher in the SHO (surgery-induced hypothyroidism) group, while Prevotellaceae and Prevotella showed lower abundance in the SHO group than the SHAM group. Present results suggest that thyroid functions may have the potential to influence the profile of gut microbiota and could be used as foundation to investigate interaction mechanism between thyroid and gut microbiome.


Assuntos
Microbioma Gastrointestinal/genética , Glândula Tireoide/microbiologia , Glândula Tireoide/patologia , Animais , Bactérias/genética , Bacteroidetes/genética , Modelos Animais de Doenças , Fezes/microbiologia , Hipotireoidismo/microbiologia , Hipotireoidismo/patologia , Masculino , Metagenômica/métodos , Microbiota/genética , RNA Ribossômico 16S/genética , Ratos , Ratos Sprague-Dawley
8.
Molecules ; 26(4)2021 Feb 08.
Artigo em Inglês | MEDLINE | ID: mdl-33567750

RESUMO

Rhus verniciflua Stokes (RVS) has been traditionally used as an herbal remedy to support the digestive functions in traditional Korean medicine. Additionally, the pharmacological effects of RVS, including antioxidative, antimicrobial and anticancer activities, have been well-reported. The genotoxicity of RVS, however, is elusive; thus, we evaluated the genotoxicity of RVS without bark (RVX) for safe application as a resource of functional food or a medical drug. To evaluate the genotoxicity of RVX, we used a bacterial reverse mutation test, chromosomal aberration test and comet assay, according to the "Organization for Economic Co-operation and Development" (OECD) guidelines. Briefly, for the reverse mutation test, samples (5000, 1667, 556, 185, 62 and 0 µg/plate of RVX or the positive control) were treated with a precultured strain (TA98, TA100, TA1535, TA1537 or WP2µvrA) with or without the S9 mix, in which RVX partially induced a reverse mutation in four bacterial strains. From the chromosomal aberration test and comet assay, the RVX samples (556, 185, 62, 20 and 0 µg/mL of RVX or the positive control) were treated in a Chinese hamster ovary cell line (CHO-K1 cells) in the conditions of the S9 mix absent or S9 mix present and in Chang liver cells and C2C12 myoblasts, respectively. No chromosomal aberrations in CHO-K1 or DNA damage in Chang liver cells and C2C12 myoblasts was observed. In conclusion, our results suggest the non-genotoxicity of RVX, which would be helpful as a reference for the safe application of bark-removed Rhus verniciflua Stokes as functional raw materials in the food, cosmetics or pharmaceutical fields.


Assuntos
Casca de Planta/química , Extratos Vegetais/química , Rhus/química , Água/química , Animais , Células CHO , Cricetulus , Relação Dose-Resposta a Droga , Humanos , Camundongos , Testes de Mutagenicidade , Extratos Vegetais/toxicidade
9.
J Cell Biochem ; 120(5): 7635-7648, 2019 May.
Artigo em Inglês | MEDLINE | ID: mdl-30450663

RESUMO

Myocardial ischemia-reperfusion injury (MIRI) is a major cause of cardiovascular disease, leading to mortality and disability associated with coronary occlusion worldwide. A correlation of mammalian target of rapamycin (mTOR)/nuclear factor-kappa B (NF-κB) signaling pathway has been observed with brain damage resulting from myocardial ischemia. Therefore, by establishing MIRI rat model, this study aimed to explore whether ring finger protein 182 (RNF182) regulates the mTOR signaling pathway affecting MIRI. Initially, MIRI rat model was successfully established, followed by either treatment of shRNF182 or phosphoesterase (PITE) (inhibitor of the mTOR signaling pathway). Then, the serum levels of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and malondialdehyde (MDA), left ventricular ejection fraction (LVEF), left ventricular fractional shortening (LVFS), left ventricular systolic pressure (LVSP), and left ventricular end-diastolic pressure (LVEDP) were determined, followed by detection of myocardial infarct sizes and myocardial cell apoptosis. Moreover, the levels of related genes/proteins were determined to further determine the mechanisms of RNF182 in MIRI. First, RNF182 was upregulated in MIRI. Another key observation of this study was that rats with shRNF182 presented with downregulated SOD, GSH-Px, and MDA in serum, accompanied by decreased levels of LVEF, LVFS, LVSP, and LVEDP. In addition, both reduced myocardial infarct sizes and apoptosis of myocardial cells were observed after silencing RNF182. Furthermore, silencing of the RNF182 was observed to downregulate Bcl 2-associated X and cysteine proteinase 3 but upregulate mTOR, ribosome protein subunit 6 kinase 1, eukaryotic elongation factor 2, and B-cell lymphoma-2. Importantly, the effects of RNF182 silencing were reversed after PITE treatment. In conclusion, our study demonstrates that RNF182 silencing can prevent ventricular remodeling in rats after MIRI by activating the mTOR signaling pathway.

10.
Am J Gastroenterol ; 119(4): 779, 2024 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-38497558
11.
Cell Physiol Biochem ; 46(4): 1525-1535, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29689546

RESUMO

BACKGROUND/AIMS: The metabolic features of cancer cells have long been acknowledged to be altered and to provide new therapeutic opportunities. The expression of glycolytic enzyme enolase 2 (ENO2) was found to be closely associated with the clinical features of acute lymphoblastic leukemia (ALL) patients, but its functions remain unclear in ALL. METHODS: We evaluated the association between ENO2 mRNA expression in bone marrow mononuclear cells (BM-MNCs) and the efficacy of chemotherapy, and further explored the function of ENO2 in ALL. The molecular mechanisms of ENO2 expression and its effects on cell growth, glycolysis and glucocorticoid resistance were explored by Cell Counting Kit-8, glucose-consumption assay, Quantitative RT-PCR, Western blotting and in vivo tumorigenesis in NOD/SCID mice. RESULTS: The results showed that ENO2 mRNA expression in BM-MNCs was significantly decreased when patients completed induction chemotherapy and reached complete remission (CR). ENO2 mRNA expression was increased when patients suffered relapse. Functional studies demonstrated that ENO2 promoted cell growth, glycolysis, and glucocorticoid resistance, all of which were effectively inhibited when ENO2 was silenced with shRNAs. Further studies revealed that ENO2 up-regulated various glycolysis-related genes and enhanced Akt activity with subsequent glycogen synthase kinase3ß (GSK-3ß) phosphorylation, inducing cell proliferation and glycolysis. The combination of silencing ENO2 and 2-deoxyglucose (2-DG) synergistically inhibited leukemia cell survival. CONCLUSIONS: These results indicate that ENO2 may be a biological marker for monitoring chemotherapeutic efficacy and relapse in ALL. ENO2 may provide a potential therapeutic strategy for ALL.


Assuntos
Fosfopiruvato Hidratase/metabolismo , Leucemia-Linfoma Linfoblástico de Células Precursoras/diagnóstico , Animais , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Desoxiglucose/farmacologia , Dexametasona/farmacologia , Resistencia a Medicamentos Antineoplásicos , Feminino , Glucocorticoides/farmacologia , Glucocorticoides/uso terapêutico , Transportador de Glucose Tipo 1/genética , Transportador de Glucose Tipo 1/metabolismo , Glicogênio Sintase Quinase 3 beta/metabolismo , Glicólise/efeitos dos fármacos , Células HEK293 , Humanos , Células Jurkat , Camundongos , Camundongos Endogâmicos NOD , Camundongos SCID , Fosfopiruvato Hidratase/antagonistas & inibidores , Fosfopiruvato Hidratase/genética , Leucemia-Linfoma Linfoblástico de Células Precursoras/tratamento farmacológico , Leucemia-Linfoma Linfoblástico de Células Precursoras/patologia , Proteínas Proto-Oncogênicas c-akt/genética , Proteínas Proto-Oncogênicas c-akt/metabolismo , Interferência de RNA , RNA Interferente Pequeno/metabolismo , Transdução de Sinais/efeitos dos fármacos , Transplante Heterólogo
12.
Adv Exp Med Biol ; 1099: 115-124, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30306519

RESUMO

Spontaneous pain is the major complain for the patients to see a doctor. Human imaging studies presented that spontaneous pain is mainly associated with activity changes in medial pain pathway, while broader brain regions were activated by allodynia pain. On behavioral level, temporally disassociation between the evoked pain and spontaneous pain was observed; these data gave a hint that the spontaneous pain and evoked pain may be mediated by different neuronal mechanisms. And more attentions should be paid to the spontaneous pain to treat the chronic pain in the future.


Assuntos
Dor Crônica/fisiopatologia , Hiperalgesia/fisiopatologia , Neurônios/fisiologia , Encéfalo/diagnóstico por imagem , Humanos , Medição da Dor
13.
Int J Mol Sci ; 19(1)2018 Jan 17.
Artigo em Inglês | MEDLINE | ID: mdl-29342124

RESUMO

Targeting energy expenditure offers a strategy for treating obesity more effectively and safely. In previous studies, we found that the root of Atractylodes macrocephala Koidzumi (Atractylodis Rhizoma Alba, ARA) increased energy metabolism in C2C12 cells. Here, we investigated the effects of ARA on obesity and glucose intolerance by examining energy metabolism in skeletal muscle and brown fat in high-fat diet (HFD) induced obese mice. ARA decreased body weight gain, hepatic lipid levels and serum total cholesterol levels, but did not modify food intake. Fasting serum glucose, serum insulin levels and glucose intolerance were all improved in ARA treated mice. Furthermore, ARA increased peroxisome proliferator-activated receptor gamma coactivator 1 alpha (PGC1α) expression, and the phosphorylation of adenosine monophosphate-activated protein kinase (AMPK) in skeletal muscle tissues, and also prevented skeletal muscle atrophy. In addition, the numbers of brown adipocytes and the expressions of PGC1α and uncoupling protein 1 (UCP1) were elevated in the brown adipose tissues of ARA treated mice. Our results show that ARA can prevent diet-induced obesity and glucose intolerance in C5BL/6 mice and suggests that the mechanism responsible is related to the promotion of energy metabolism in skeletal muscle and brown adipose tissues.


Assuntos
Atractylodes/química , Metabolismo Energético/efeitos dos fármacos , Intolerância à Glucose/metabolismo , Obesidade/metabolismo , Extratos Vegetais/farmacologia , Raízes de Plantas/química , Tecido Adiposo Marrom/efeitos dos fármacos , Tecido Adiposo Marrom/metabolismo , Animais , Biomarcadores/sangue , Glicemia/efeitos dos fármacos , Peso Corporal/efeitos dos fármacos , Dieta Hiperlipídica , Modelos Animais de Doenças , Metabolismo dos Lipídeos/efeitos dos fármacos , Camundongos , Músculo Esquelético/efeitos dos fármacos , Músculo Esquelético/metabolismo , Obesidade/etiologia , Obesidade/prevenção & controle , Extratos Vegetais/química
14.
Dev Biol ; 409(1): 16-25, 2016 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-26586200

RESUMO

Skeletal muscle development (myogenesis) is a complex but precisely orchestrated process involving spatiotemporal regulation of the proliferation, differentiation and fusion of myogenic progenitor cells (myoblasts). Here we identify brain expressed x-linked gene 1 (Bex1) as a transient, developmentally regulated gene involved in myoblast fusion. Bex1 expression is undetectable in adult muscles or in quiescent muscle stem cells (satellite cells). During embryonic myogenesis, however, Bex1 is robustly expressed by myogenin(+) differentiating myoblasts, but not by Pax7(+) proliferating myoblasts. Interestingly, Bex1 is initially localized in the cytoplasm and then translocates into the nucleus. During adult muscle regeneration, Bex1 is highly expressed in newly regenerated myofibers and the expression is rapidly downregulated during maturation. Consistently, in cultured myoblasts, Bex1 is not expressed at the proliferation stage but transiently expressed upon induction of myogenic differentiation, following a similar cytoplasm to nucleus translocation pattern as seen in vivo. Using gain- and loss-of-function studies, we found that overexpression of Bex1 promotes the fusion of primary myoblasts without affecting myogenic differentiation and myogenin expression. Conversely, Bex1 knockout myoblasts exhibit obvious fusion defects, even though they express normal levels of myogenin and differentiate normally. These results elucidate a novel role of Bex1 in myogenesis through regulating myoblast fusion.


Assuntos
Fusão Celular , Mioblastos/citologia , Mioblastos/metabolismo , Proteínas do Tecido Nervoso/metabolismo , Animais , Diferenciação Celular/genética , Proliferação de Células , Desenvolvimento Embrionário/genética , Regulação da Expressão Gênica no Desenvolvimento , Camundongos Knockout , Desenvolvimento Muscular/genética , Fibras Musculares Esqueléticas/citologia , Fibras Musculares Esqueléticas/metabolismo , Músculo Esquelético/embriologia , Músculo Esquelético/metabolismo , Proteínas do Tecido Nervoso/genética , Regeneração/genética , Células-Tronco/metabolismo
15.
Ann Hematol ; 96(12): 2079-2088, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-28871325

RESUMO

The IL-2/IL-2 receptor (IL-2R) system plays a central role in maintaining normal T cell immunity, and its disturbance is associated with several hematologic disorders. Studies have found in several types of lymphoma that abnormal amounts of soluble IL-2R (sIL-2R) may result in imbalance of the IL-2/IL-2R system and hence of the T cell immunoregulation. Whether the level of sIL-2R in blood could predict treatment outcomes or not needs to be investigated in multiple myeloma (MM) patients. The level of sIL-2R in serum was measured using enzyme-linked immunosorbent assay (ELISA) in 81 patients with newly diagnosed MM. Twenty-six patients (32.1%) were treated with bortezomib-based regimens and 55patients (67.9%) received old drugs-based regimens. The mean concentration of sIL-2R for myeloma patients was 8.51 ng/ml, significantly higher than that of healthy controls (0.56 ng/ml, p < 0.0001). The best cutoff value for sIL-2R in predicting high risk for disease progression is 6.049 ng/ml with an area under curve (AUC) of 0.665 (p = 0.013). Thirty-six patients (44.4%) were classified as higher sIL-2R level group (> 6.049 ng/ml), and 45 patients (55.6%) as lower group (≤ 6.049 ng/ml). The overall response rate (ORR) was 60.0% in lower sIL-2R level group, and 41.7% in higher level group (p = 0.156). The median progression-free survival (PFS) and overall survival (OS) was 12 months (range, 2.0-65 months) and 20 months (range, 2.0-118 months), respectively. In a multivariate survival analysis, including Eastern Cooperative Oncology Group performance status score, treatment response, and sIL-2R level, it was found that all these three parameters were significantly independent prognostic factors for PFS (p = 0.032, 0.016, and 0.043, respectively), but none factors maintained their value in predicting OS. Subgroup analysis revealed that high level of sIL-2R is correlated with significantly inferior PFS in patients treated with bortezomib-based regimens (p = 0.004). Serum sIL-2R level is an independent prognostic factor for PFS, indicating novel drugs targeting the imbalance of IL-2/IL-2R system may be a promising strategy in MM.


Assuntos
Bortezomib/administração & dosagem , Resistencia a Medicamentos Antineoplásicos , Mieloma Múltiplo , Proteínas de Neoplasias/sangue , Receptores de Interleucina-2/sangue , Idoso , Intervalo Livre de Doença , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Mieloma Múltiplo/sangue , Mieloma Múltiplo/tratamento farmacológico , Mieloma Múltiplo/mortalidade , Fatores de Risco , Taxa de Sobrevida
16.
Dev Biol ; 402(1): 72-80, 2015 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-25794679

RESUMO

Each skeletal muscle contains a fixed ratio of fast and slow myofibers that are distributed in a stereotyped pattern to achieve a specific motor function. How myofibers are specified during development and regeneration is poorly understood. Here we address this question using transgenic reporter mice that indelibly mark the myofiber lineages based on activation of fast or slow myosin. Lineage tracing indicates that during development all muscles have activated the fast myosin gene Myl1, but not the slow myosin gene Myh7, which is activated in all slow but a subset of fast myofibers. Similarly, most nascent myofibers do not activate Myh7 during fast muscle regeneration, but the ratio and pattern of fast and slow myofibers are restored at the completion of regeneration. At the single myofiber level, most mature fast myofibers are heterogeneous in nuclear composition, manifested by mosaic activation of Myh7. Strikingly, Myh7 is activated in a subpopulation of proliferating myoblasts that co-express the myogenic progenitor marker Pax7. When induced to differentiate, the Myh7-activated myoblasts differentiate more readily than the non-activated myoblasts, and have a higher tendency, but not restricted, to become slow myotubes. Together, our data reveal significant nuclear heterogeneity within a single myofiber, and challenge the conventional view that myosin genes are only expressed after myogenic differentiation. These results provide novel insights into the regulation of muscle fiber type specification.


Assuntos
Regulação da Expressão Gênica no Desenvolvimento , Fibras Musculares de Contração Lenta/metabolismo , Músculos/citologia , Músculos/metabolismo , Mioblastos/citologia , Cadeias Pesadas de Miosina/metabolismo , Animais , Cardiotoxinas/química , Diferenciação Celular , Núcleo Celular/metabolismo , Separação Celular , Células Cultivadas , Citometria de Fluxo , Genes Reporter , Proteínas de Fluorescência Verde/metabolismo , Camundongos , Camundongos Transgênicos , Músculo Esquelético/metabolismo , Músculos/patologia , Miosinas/química , Fator de Transcrição PAX7/metabolismo , Regeneração , Células Satélites de Músculo Esquelético/citologia
17.
Clin Immunol ; 173: 109-116, 2016 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-27664932

RESUMO

MicroRNA 182 has been found to have a distinct contribution in the clonal expansion of activated- and functioning of specialized-helper T cells. In this study we knocked down microRNA 182 in vivo and induced experimental autoimmune encephalomyelitis (EAE) to determine the influences of microRNA 182 in the Treg cells functional specialization through Foxo1 dependent pathway in the peripheral lymphoid organs. Down-regulation of microRNA 182 significantly increased the proportions of Foxp3+ T cells in the peripheral lymph nodes and spleen. In vivo study verified a positive correlation between microRNA 182 levels and symptom severity of EAE, and a negative correlation between microRNA 182 and the transcriptional factor Foxp3. In vitro polarization study also confirmed the contribution of Foxo1 in microRNA 182 mediated down-regulation of Foxp3+ T cells. Together, our results provide evidence that during the development of EAE, microRNA 182 repressed Treg cells differentiation through the Foxo1 dependent pathway.


Assuntos
Encefalomielite Autoimune Experimental/imunologia , Proteína Forkhead Box O1/imunologia , MicroRNAs/imunologia , Linfócitos T Reguladores/imunologia , Animais , Diferenciação Celular , Feminino , Linfonodos/citologia , Camundongos Endogâmicos C57BL , Baço/citologia , Linfócitos T Reguladores/fisiologia
18.
Drug Chem Toxicol ; 39(1): 111-8, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-26045230

RESUMO

Three chemotoxins including dimethylnitrosamine (DMN), carbon tetrachloride (CCl4), and thioacetamide (TAA) are commonly used in hepatofibrotic models. We aimed to draw characteristics of histopathology and pro-fibrogenic cytokines including TGF-ß, PDGF and CTGF among three models. Rats were divided into six groups and intra-peritoneally injected with DMN (10 mg/kg, for three weeks, three consecutive days weekly), CCl4 (1.6 g/kg, for 10 weeks, twice weekly), TAA (200 mg/kg, for 12 weeks, twice weekly) or their corresponded treatment for each control group. The liver weights were decreased in DMN model, but not other models. Ascites were occurred as 3-, 2-, and 7-rats in DMN, CCl4, and TAA model, respectively. The lipid peroxidation was highest in CCl4 model, serum levels of liver enzymes were increased as similar severity. The hepatofibrotic alterations were remarkable in DMN and TAA model, but not CCl4 as evidenced by the Masson trichrome staining and hydroxyproline. The immunohistochemistry for α-SAM showed that the DMN model was most severely enhanced than other models. On the other hand, hepatic tissue levels of pro-fibrogenic cytokines including TGF-ß, PDGF, and CTGF were generally increased in three models, but totally different among models or measurement resources. Especially, serum levels of three cytokines were remarkably increased by CCl4 injection and CTGF levels in both hepatic tissue and serum were highest in CCl4 group. Our results firstly demonstrated comparative study for features of morphological finding and pro-fibrogenic cytokines in serum and hepatic protein levels among three models. Above results would be a helpful reference for hepatofibrotic studies.


Assuntos
Tetracloreto de Carbono/toxicidade , Dimetilnitrosamina/toxicidade , Cirrose Hepática Experimental/fisiopatologia , Tioacetamida/toxicidade , Animais , Fator de Crescimento do Tecido Conjuntivo/metabolismo , Modelos Animais de Doenças , Imuno-Histoquímica , Peroxidação de Lipídeos/efeitos dos fármacos , Cirrose Hepática Experimental/induzido quimicamente , Masculino , Fator de Crescimento Derivado de Plaquetas/metabolismo , Ratos , Ratos Sprague-Dawley , Fator de Crescimento Transformador beta/metabolismo
19.
Molecules ; 21(11)2016 Nov 11.
Artigo em Inglês | MEDLINE | ID: mdl-27845741

RESUMO

The brain, gut, and adipose tissue interact to control metabolic pathways, and impairment in the brain-gut-adipose axis can lead to metabolic disorders, including obesity. Chowiseungcheng-tang (CST), a herbal formulation, is frequently used to treat metabolic disorders. Here, we investigated the anti-obesity effect of CST and its link with brain-gut-adipose axis using C57BL/6J mice as a model. The animals were provided with a normal research diet (NRD) or high-fat diet (HFD) in absence or presence of CST or orlistat (ORL) for 12 weeks. CST had a significant anti-obesity effect on a number of vital metabolic and obesity-related parameters in HFD-fed mice. CST significantly decreased the expression levels of genes encoding obesity-promoting neuropeptides (agouti-related peptide, neuropeptide Y), and increased the mRNA levels of obesity-suppressing neuropeptides (proopiomelanocortin, cocaine-and amphetamine-regulated transcript) in the hypothalamus. CST also effectively decreased the expression level of gene encoding obesity-promoting adipokine (retinol-binding protein-4) and increased the mRNA level of obesity-suppressing adipokine (adiponectin) in visceral adipose tissue (VAT). Additionally, CST altered the gut microbial composition in HFD groups, a phenomenon strongly associated with key metabolic parameters, neuropeptides, and adipokines. Our findings reveal that the anti-obesity impact of CST is mediated through modulation of metabolism-related neuropeptides, adipokines, and gut microbial composition.


Assuntos
Tecido Adiposo/efeitos dos fármacos , Fármacos Antiobesidade/química , Fármacos Antiobesidade/farmacologia , Encéfalo/efeitos dos fármacos , Trato Gastrointestinal/efeitos dos fármacos , Extratos Vegetais/química , Extratos Vegetais/farmacologia , Adipocinas/genética , Tecido Adiposo/metabolismo , Adiposidade/efeitos dos fármacos , Animais , Biomarcadores , Glicemia/efeitos dos fármacos , Peso Corporal/efeitos dos fármacos , Encéfalo/metabolismo , Dieta Hiperlipídica , Modelos Animais de Doenças , Metabolismo Energético/efeitos dos fármacos , Microbioma Gastrointestinal/efeitos dos fármacos , Trato Gastrointestinal/metabolismo , Regulação da Expressão Gênica/efeitos dos fármacos , Insulina/sangue , Lipídeos/sangue , Testes de Função Hepática , Masculino , Camundongos , Neuropeptídeos/genética , Obesidade/tratamento farmacológico , Obesidade/etiologia , Obesidade/metabolismo , Tamanho do Órgão/efeitos dos fármacos
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA