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1.
Drug Resist Updat ; 76: 101111, 2024 Jun 14.
Artigo em Inglês | MEDLINE | ID: mdl-38908233

RESUMO

Gemcitabine (GEM) based induction chemotherapy is a standard treatment for locoregionally advanced nasopharyngeal carcinoma (NPC). However, approximately 15 % of patients are still resistant to GEM-containing chemotherapy, which leads to treatment failure. Nevertheless, the underlying mechanisms of GEM resistance remain poorly understood. Herein, based on a microarray analysis, we identified 221 dysregulated lncRNAs, of which, DYNLRB2-AS1 was one of the most upregulated lncRNAs in GEM-resistance NPC cell lines. DYNLRB2-AS1 was shown to function as contain an oncogenic lncRNA that promoted NPC GEM resistance, cell proliferation, but inhibited cell apoptosis. Mechanistically, DYNLRB2-AS1 could directly bind to the DHX9 protein and prevent its interaction with the E3 ubiquitin ligase PRPF19, and thus blocking PRPF19-mediated DHX9 degradation, which ultimately facilitated the repair of DNA damage in the presence of GEM. Clinically, higher DYNLRB2-AS1 expression indicated an unfavourable overall survival of NPC patients who received induction chemotherapy. Overall, this study identified the oncogenic lncRNA DYNLRB2-AS1 as an independent prognostic biomarker for patients with locally advanced NPC and as a potential therapeutic target for overcoming GEM chemoresistance in NPC.

2.
Acta Pharmacol Sin ; 2024 Jun 10.
Artigo em Inglês | MEDLINE | ID: mdl-38858494

RESUMO

T cell engaging bispecific antibodies (TCBs) have recently become significant in cancer treatment. In this study we developed MSLN490, a novel TCB designed to target mesothelin (MSLN), a glycosylphosphatidylinositol (GPI)-linked glycoprotein highly expressed in various cancers, and evaluated its efficacy against solid tumors. CDR walking and phage display techniques were used to improve affinity of the parental antibody M912, resulting in a pool of antibodies with different affinities to MSLN. From this pool, various bispecific antibodies (BsAbs) were assembled. Notably, MSLN490 with its IgG-[L]-scFv structure displayed remarkable anti-tumor activity against MSLN-expressing tumors (EC50: 0.16 pM in HT-29-hMSLN cells). Furthermore, MSLN490 remained effective even in the presence of non-membrane-anchored MSLN (soluble MSLN). Moreover, the anti-tumor activity of MSLN490 was enhanced when combined with either Atezolizumab or TAA × CD28 BsAbs. Notably, a synergistic effect was observed between MSLN490 and paclitaxel, as paclitaxel disrupted the immunosuppressive microenvironment within solid tumors, enhancing immune cells infiltration and improved anti-tumor efficacy. Overall, MSLN490 exhibits robust anti-tumor activity, resilience to soluble MSLN interference, and enhanced anti-tumor effects when combined with other therapies, offering a promising future for the treatment of a variety of solid tumors. This study provides a strong foundation for further exploration of MSLN490's clinical potential.

3.
Neurochem Res ; 48(1): 238-249, 2023 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-36063295

RESUMO

Lead (Pb) is considered to be a major environmental pollutant and occupational health hazard worldwide which may lead to neuroinflammation. However, an effective treatment for Pb-induced neuroinflammation remains elusive. The aim of this study was to investigate the mechanisms of Pb-induced neuroinflammation, and the therapeutic effect of sodium para-aminosalicylic acid (PAS-Na, a non-steroidal anti-inflammatory drug) in rat cerebral cortex. The results indicated that Pb exposure induced pathological damage in cerebral cortex, accompanied by increased levels of inflammatory factors tumor necrosis factor-alpha (TNF-α) and interleukin-1 beta (IL-1ß). Moreover, Pb decreased the expression of silencing information regulator 2 related enzyme 1 (SIRT1) and brain-derived neurotrophic factor (BDNF), and increased the levels of high mobile group box 1 (HMGB1) expression and p65 nuclear factor-κB (NF-κB) phosphorylation. PAS-Na treatment ameliorated Pb-induced histopathological changes in rat cerebral cortex. Moreover, PAS-Na reduced the Pb-induced increase of TNF-α and IL-1ß levels concomitant with a significant increase in SIRT1 and BDNF levels, and a decrease in HMGB1 and the phosphorylation of p65 NF-κB expression. Thus, PAS-Na may exert anti-inflammatory effects by mediating the SIRT1/HMGB1/NF-κB pathway and BDNF expression. In conclusion, in this novel study PAS-Na was shown to possess an anti-inflammatory effect on cortical neuroinflammation, establishing its efficacy as a potential treatment for Pb exposures.


Assuntos
Ácido Aminossalicílico , Proteína HMGB1 , Ratos , Animais , NF-kappa B/metabolismo , Fator Neurotrófico Derivado do Encéfalo/metabolismo , Proteína HMGB1/metabolismo , Ratos Sprague-Dawley , Fator de Necrose Tumoral alfa/metabolismo , Doenças Neuroinflamatórias , Sódio , Sirtuína 1/metabolismo , Chumbo/toxicidade , Encéfalo/metabolismo , Córtex Cerebral/metabolismo , Anti-Inflamatórios
4.
Res Nurs Health ; 45(1): 94-107, 2022 02.
Artigo em Inglês | MEDLINE | ID: mdl-34907548

RESUMO

Previous studies have investigated influencing factors of early discontinuation of breastfeeding, but few studies have developed an easy-to-use tool to identify risk of breastfeeding cessation at 6 months after birth. This research team aimed to develop and validate an exclusive breastfeeding duration risk nomogram in Chinese mothers. A longitudinal cohort survey was conducted. Data were collected from 394 postpartum women in three hospitals in Hubei Province, China from December 2017 to December 2018. The LASSO regression model was used to screen for optimized factors in an exclusive breastfeeding duration model. Multivariable logistic regression was applied to construct a prediction model. Discrimination and calibration were assessed using a C-index and calibration curve, and internal validity was established using bootstrapping validation. Factors integrated in the prediction risk nomogram were monthly household income (odds ratio [OR] = 1.31, 95% confidence interval [CI]: [0.95, 1.80]), experiences of breastfeeding (OR = 1.23, 95% CI: [0.92, 1.63]), attitude (OR = 1.72, 95% CI: [0.94, 3.16]), self-efficacy (OR = 2.45, 95% CI: [1.40, 4.29]), perceived insufficient milk supply (OR = 0.12, 95% CI: [0.06, 0.25]) and postpartum depression (OR = 0.06, 95% CI: [0.02, 0.17]). The model displayed good discrimination with a C-index of 0.87 (95% CI: [0.84, 0.91]) and good calibration. The C-index interval validation was confirmed to be 0.86. This study resulted in the development of a novel nomogram with good accuracy to aid healthcare professionals in assessing the probability of a mother discontinuing exclusive breastfeeding at the breast before 6 months.


Assuntos
Aleitamento Materno , Período Pós-Parto , Autoeficácia , Adolescente , Adulto , China , Estudos de Coortes , Feminino , Humanos , Estudos Longitudinais , Pesquisa em Enfermagem , Valor Preditivo dos Testes , Gravidez , Inquéritos e Questionários , Fatores de Tempo , Adulto Jovem
5.
Mol Cancer ; 20(1): 27, 2021 02 04.
Artigo em Inglês | MEDLINE | ID: mdl-33541368

RESUMO

The development of immune checkpoint blockade (ICB)-based immunotherapy has dramatically changed methods of cancer treatment. This approach triggers a durable treatment response and prolongs patients' survival; however, not all patients can benefit. Accumulating evidence demonstrated that the efficacy of ICB is dependent on a robust antitumor immune response that is usually damaged in most tumors. Conventional chemotherapy and targeted therapy promote the antitumor immune response by increasing the immunogenicity of tumor cells, improving CD8+ T cell infiltration, or inhibiting immunosuppressive cells in the tumor microenvironment. Such immunomodulation provides a convincing rationale for the combination therapy of chemotherapeutics and ICBs, and both preclinical and clinical investigations have shown encouraging results. However, the optimal drug combinations, doses, timing, and sequence of administration, all of which affect the immunomodulatory effect of chemotherapeutics, as well as the benefit of combination therapy, are not yet determined. Future studies should focus on these issues and help to develop the optimal combination regimen for each cancer.


Assuntos
Antineoplásicos/farmacologia , Inibidores de Checkpoint Imunológico/farmacologia , Terapia de Alvo Molecular , Microambiente Tumoral/efeitos dos fármacos , Animais , Antineoplásicos/uso terapêutico , Linfócitos T CD8-Positivos/efeitos dos fármacos , Linfócitos T CD8-Positivos/imunologia , Linfócitos T CD8-Positivos/metabolismo , Tomada de Decisão Clínica , Gerenciamento Clínico , Suscetibilidade a Doenças , Sinergismo Farmacológico , Humanos , Inibidores de Checkpoint Imunológico/uso terapêutico , Imunidade Celular/efeitos dos fármacos , Imunidade Celular/imunologia , Imunomodulação/efeitos dos fármacos , Linfócitos do Interstício Tumoral/efeitos dos fármacos , Linfócitos do Interstício Tumoral/imunologia , Linfócitos do Interstício Tumoral/metabolismo , Terapia de Alvo Molecular/métodos , Neoplasias/tratamento farmacológico , Neoplasias/etiologia , Neoplasias/metabolismo , Neoplasias/patologia
6.
Mol Cancer ; 20(1): 14, 2021 01 11.
Artigo em Inglês | MEDLINE | ID: mdl-33430876

RESUMO

Currently, there is no strong evidence of the well-established biomarkers for immune checkpoint inhibitors (ICIs) in nasopharyngeal carcinoma (NPC). Here, we aimed to reveal the heterogeneity of tumour microenvironment (TME) through virtual microdissection of gene expression profiles. An immune-enriched subtype was identified in 38% (43/113) of patients, which was characterized by significant enrichment of immune cells or immune responses. The remaining patients were therefore classified as a non-Immune Subtype (non-IS), which exhibited highly proliferative features. Then we identified a tumour immune evasion state within the immune-enriched subtype (18/43, 42%), in which high expression of exclusion- and dysfunction-related signatures was observed. These subgroups were designated the Evaded and Active Immune Subtype (E-IS and A-IS), respectively. We further demonstrated that A-IS predicted favourable survival and improved ICI response as compared to E-IS and non-IS. In summary, this study introduces the novel immune subtypes and demonstrates their feasibility in tailoring immunotherapeutic strategies.


Assuntos
Heterogeneidade Genética , Imunoterapia , Carcinoma Nasofaríngeo/imunologia , Carcinoma Nasofaríngeo/terapia , Microambiente Tumoral , Estudos de Coortes , Genoma Humano , Humanos , Carcinoma Nasofaríngeo/genética , Prognóstico , Reprodutibilidade dos Testes , Microambiente Tumoral/genética
7.
Birth ; 48(3): 397-405, 2021 09.
Artigo em Inglês | MEDLINE | ID: mdl-33884662

RESUMO

BACKGROUND AND AIMS: The relationship between prior breastfeeding experience and the duration of exclusive breastfeeding is of significant interest, but few studies have explored the mechanisms underlying this relationship. The purpose of this study is to address two hypotheses: (a) that attitude and self-efficacy mediate the relationship between previous breastfeeding experience and the duration of exclusive breastfeeding; and (b) that attitude and self-efficacy have serial mediation functions in this relationship. METHODS: The data collection process was divided into two stages. The original stage included 394 women hospitalized after delivery who completed socio-demographic questionnaires (including previous breastfeeding experience), the Iowa Infant Feeding Attitude Scale (IIFAS), and the Breastfeeding Self-efficacy Short-Form Scale (BSES-SF). Follow-up data about duration of exclusive breastfeeding were obtained at six months postpartum. RESULTS: Mediation analysis indicated that previous breastfeeding experience directly affected the duration of exclusive breastfeeding and that the rate of the total indirect effect was 22.878%. Self-efficacy mediated previous breastfeeding experience and duration of exclusive breastfeeding, whereas attitude and self-efficacy played the series mediational role between previous breastfeeding experience and duration of exclusive breastfeeding. Cluster analysis supported these results. CONCLUSIONS: The duration of exclusive breastfeeding can be promoted by improving breastfeeding attitude and self-efficacy in women without breastfeeding experience.


Assuntos
Aleitamento Materno , Autoeficácia , Análise por Conglomerados , Feminino , Humanos , Período Pós-Parto , Inquéritos e Questionários
8.
Eur Radiol ; 30(2): 816-822, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31650266

RESUMO

OBJECTIVES: The 8th edition of the American Joint Committee on Cancer (AJCC) staging system for nasopharyngeal carcinoma (NPC) merged T4N0-2 and T1-4N3 to create stage IVa. In the present study, we aimed to assess the difference in clinical outcomes and patterns of failure between 8th AJCC T4N0-2 and T1-4N3 NPC patients treated with intensity-modulated radiotherapy (IMRT). METHODS: We included 3107 patients with stage IVa NPC disease (1871 with T4N0-2 and 1236 with T1-4N3) according to the 8th AJCC staging system. Overall survival (OS) was the primary endpoint. The clinical outcomes between T4N0-2 and T1-4N3 patients were compared. RESULTS: T1-4N3 patients had significantly worse 3-year OS (84.1% vs. 89.2%; p < 0.001) and distant metastasis-free survival (DMFS; 78.3% vs. 85.9%; p < 0.001), but better local relapse-free survival (LRFS; 94.9% vs. 92.2%; p = 0.003), as compared with T4N0-2 patients. Multivariate analysis showed that T1-4N3 was still an independent adverse prognostic factor for both DMFS (hazard ratio [HR] = 1.517, 95% confidence interval [CI] = 1.274-1.806, p < 0.001) and OS (HR = 1.315, 95% CI = 1.100-1.572, p = 0.003), whereas T4N0-2 was an independent adverse prognostic factor for LRFS (HR = 1.581, 95% CI = 1.158-2.158, p = 0.004). CONCLUSIONS: In terms of the OS, T4N0-2 patients had better prognosis compared with T1-4N3 patients, and the patterns of failure differed between T4N0-2 and T1-4N3 patients. We believe that future modifications of the AJCC/UICC staging system should separate T4N0-2 from T1-4N3. KEY POINTS: • In nasopharyngeal carcinoma, T4N0-2 patients tended to develop local relapse, whereas T1-4N3 patients were more likely to develop distant metastasis. • In terms of overall survival, T4N0-2 patients had better prognosis than T1-4N3 patients. • T4N0-2 should be separated from T1-4N3 in the UICC/AJCC staging system.


Assuntos
Carcinoma Nasofaríngeo/radioterapia , Neoplasias Nasofaríngeas/radioterapia , Radioterapia de Intensidade Modulada/métodos , Adulto , Idoso , Feminino , Seguimentos , Humanos , Estimativa de Kaplan-Meier , Masculino , Pessoa de Meia-Idade , Carcinoma Nasofaríngeo/patologia , Carcinoma Nasofaríngeo/secundário , Neoplasias Nasofaríngeas/patologia , Recidiva Local de Neoplasia/patologia , Estadiamento de Neoplasias , Prognóstico , Estudos Retrospectivos , Falha de Tratamento , Resultado do Tratamento
9.
Int J Cancer ; 144(2): 281-289, 2019 01 15.
Artigo em Inglês | MEDLINE | ID: mdl-29752822

RESUMO

Multigene panel testing of breast cancer predisposition genes have been extensively conducted in Europe and America, which is relatively rare in Asia however. In this study, we assessed the frequency of germline mutations in 40 cancer predisposition genes, including BRCA1 and BRCA2, among a large cohort of Chinese patients with high hereditary risk of BC. From 2015 to 2016, consecutive BC patients from 26 centers of China with high hereditary risk were recruited (n = 937). Clinical information was collected and next-generation sequencing (NGS) was performed using blood samples of participants to identify germline mutations. In total, we acquired 223 patients with putative germline mutations, including 159 in BRCA1/2, 61 in 15 other BC susceptibility genes and 3 in both BRCA1/2 and non-BRCA1/2 gene. Major mutant non-BRCA1/2 genes were TP53 (n = 18), PALB2 (n = 11), CHEK2 (n = 6), ATM (n = 6) and BARD1 (n = 5). No factors predicted pathologic mutations in non-BRCA1/2 genes when treated as a whole. TP53 mutations were associated with HER-2 positive BC and younger age at diagnosis; and CHEK2 and PALB2 mutations were enriched in patients with luminal BC. Among high hereditary risk Chinese BC patients, 23.8% contained germline mutations, including 6.8% in non-BRCA1/2 genes. TP53 and PALB2 had a relatively high mutation rate (1.9 and 1.2%). Although no factors predicted for detrimental mutations in non-BRCA1/2 genes, some clinical features were associated with mutations of several particular genes.


Assuntos
Neoplasias da Mama/genética , Predisposição Genética para Doença/genética , Adulto , Povo Asiático/genética , Feminino , Mutação em Linhagem Germinativa , Humanos , Pessoa de Meia-Idade
10.
J Chem Inf Model ; 59(4): 1605-1623, 2019 04 22.
Artigo em Inglês | MEDLINE | ID: mdl-30888812

RESUMO

It has demonstrated that glycogen synthase kinase 3ß (GSK3ß) is related to Alzheimer's disease (AD). On the basis of the world largest traditional Chinese medicine (TCM) database, a network-pharmacology-based approach was utilized to investigate TCM candidates that can dock well with multiple targets. Support vector machine (SVM) and multiple linear regression (MLR) methods were utilized to obtain predicted models. In particular, the deep learning method and the random forest (RF) algorithm were adopted. We achieved R2 values of 0.927 on the training set and 0.862 on the test set with deep learning and 0.869 on the training set and 0.890 on the test set with RF. Besides, comparative molecular similarity indices analysis (CoMSIA) was performed to get a predicted model. All of the training models achieved good results on the test set. The stability of GSK3ß protein-ligand complexes was evaluated using 100 ns of MD simulation. Methyl 3- O-feruloylquinate and cynanogenin A induced both more compactness to the GSK3ß complex and stable conditions at all simulation times, and the GSK3ß complex also had no substantial fluctuations after a simulation time of 5 ns. For TCM molecules, we used the trained models to calculate predicted bioactivity values, and the optimum TCM candidates were obtained by ranking the predicted values. The results showed that methyl 3- O-feruloylquinate contained in Phellodendron amurense and cynanogenin A contained in Cynanchum atratum are capable of forming stable interactions with GSK3ß.


Assuntos
Doença de Alzheimer/tratamento farmacológico , Biologia Computacional/métodos , Aprendizado Profundo , Medicina Tradicional Chinesa , Bases de Dados de Produtos Farmacêuticos , Composição de Medicamentos , Quinase 3 da Glicogênio Sintase/química , Quinase 3 da Glicogênio Sintase/metabolismo , Simulação de Acoplamento Molecular , Simulação de Dinâmica Molecular , Conformação Proteica , Mapas de Interação de Proteínas , Relação Quantitativa Estrutura-Atividade , Máquina de Vetores de Suporte
11.
J Nat Prod ; 82(4): 859-869, 2019 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-30848923

RESUMO

Five new phloroglucinol derivatives, eucalyptins C-G (1-5), together with 13 known analogues (6-18) were isolated from the fruits of Eucalyptus globulus. The structures and absolute configurations of 1-5 were established by means of spectroscopic data analysis, computational calculation methods, and single-crystal X-ray diffraction. Compounds 1-18 were investigated for their immunosuppressive effects in vitro, and 1, 2, 6, and 7 displayed moderate inhibitory activities with IC50 values of 11.8, 10.2, 18.2, and 19.1 µM, respectively. The stimulation index (SI) of 1 was 64.2 and was compared to that of cyclosporine A (SI = 149.57). Further study demonstrated that 1 exhibited an immunosuppressive effect through inducing apoptosis and inhibiting cytokine secretion.


Assuntos
Eucalyptus/química , Imunossupressores/farmacologia , Floroglucinol/farmacologia , Animais , Células Cultivadas , Cristalografia por Raios X , Citocinas/metabolismo , Humanos , Imunossupressores/química , Concentração Inibidora 50 , Camundongos , Camundongos Endogâmicos BALB C , Estrutura Molecular , Floroglucinol/química
12.
Planta Med ; 85(9-10): 692-700, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-30791058

RESUMO

Dammarane-type saponins, the main active ingredients of Panax notoginseng, have substantial neuroprotective effects in different animal models of neurodegenerative diseases. However, because these compounds have different structures, the level of protection provided by individual compounds varies, and highly active compounds can be selected based on structure-activity relationships. Glutamate is a major excitatory neurotransmitter that plays an important role in synaptic response development. However, excessive extracellular glutamate levels lead to neuronal dysfunctions in the central nervous system. Herein, we investigated the neuroprotective effects of nine saponins (compounds 1:  - 9: ) on glutamate-treated PC12 cells in the concentration range of 0.1 - 10 µM. The MTT assay revealed that these compounds increased cell viability to 65.6, 69.8, 76.9, 91.7, 74.4, 63.3, 59.9, 64.7, and 59.9%, respectively, compared with the glutamate-treated cells (44.6%). Protopanaxatriol (compound 4: ) was the most neuroprotective compound, and subsequent experiments revealed that pretreatment with compound 4: significantly reverses mitochondrial membrane potential collapse, increases superoxide dismutase activity, and decreases lactate dehydrogenase leakage, malondiadehyde levels, reactive oxygen species generation, and cell apoptosis. Compound 4: also decreased the Bax/Bcl-2 ratio, cleaved caspase-3, N-methyl-D-aspartic receptor 1, and Ca2+-/calmodulin-dependent protein kinase II expression, and inhibited glutamate-induced cytochrome C release and phosphorylation of apoptosis signal-regulating kinase 1, c-Jun N-terminal kinase, and p38. Overall, the results indicate that protopanaxatriol has significant neuroprotective effects, and might be a promising neuroprotective agent for preventing and treating neurodegenerative diseases.


Assuntos
Ácido Glutâmico/efeitos adversos , Fármacos Neuroprotetores/farmacologia , Panax notoginseng/química , Saponinas/química , Saponinas/farmacologia , Animais , Apoptose/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Relação Dose-Resposta a Droga , Avaliação Pré-Clínica de Medicamentos/métodos , Malondialdeído/metabolismo , Fármacos Neuroprotetores/administração & dosagem , Fármacos Neuroprotetores/química , Estresse Oxidativo/efeitos dos fármacos , Células PC12 , Fosforilação/efeitos dos fármacos , Proteínas/metabolismo , Ratos , Espécies Reativas de Oxigênio/metabolismo , Receptores de N-Metil-D-Aspartato/metabolismo , Saponinas/administração & dosagem , Triterpenos/química , Damaranos
13.
Exp Cell Res ; 350(1): 73-82, 2017 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-27871850

RESUMO

Uterine fibroids, also known as uterine leiomyomas, are a benign tumor of the human uterus and the commonest estrogen-dependent benign tumor found in women. Myocardin is an important transcriptional regulator in smooth and cardiac muscle development. The role of myocardin and its relationship with ERα in uterine fibroids have barely been addressed. We noticed that the expression of myocardin was markedly reduced in human uterine fibroid tissue compared with corresponding normal or adjacent myometrium tissue. Here we reported that myocardin induced the transcription and expression of differentiation markers SM22α and alpha smooth muscle actin (α-SMA) in rat primary uterine smooth muscle cells (USMCs) and this effect was inhibited by ERα. Notably, we showed that, ERα induced expression of proliferation markers PCNA and ki-67 in rat primary USMCs. We also found ERα interacted with myocardin and formed complex to bind to CArG box and inhibit the SM22α promoter activity. Furthermore, ERα inhibited the transcription and expression of myocardin, and reduced the levels of transcription and expression of downstream target SM22α, a SMC differentiation marker. Our data thus provided important and novel insights into how ERα and myocardin interact to control the cell differentiation and proliferation of USMCs. Thus, it may provide potential therapeutic target for uterine fibroids.


Assuntos
Diferenciação Celular/efeitos dos fármacos , Receptor alfa de Estrogênio/metabolismo , Leiomioma/metabolismo , Proteínas Nucleares/farmacologia , Transativadores/farmacologia , Animais , Diferenciação Celular/fisiologia , Regulação da Expressão Gênica/genética , Humanos , Leiomioma/induzido quimicamente , Leiomioma/tratamento farmacológico , Músculo Liso Vascular/efeitos dos fármacos , Músculo Liso Vascular/metabolismo , Miócitos de Músculo Liso/efeitos dos fármacos , Miócitos de Músculo Liso/metabolismo , Proteínas Nucleares/metabolismo , Regiões Promotoras Genéticas/genética , Ratos , Fator de Resposta Sérica/metabolismo , Transativadores/metabolismo
14.
Exp Cell Res ; 359(2): 394-404, 2017 10 15.
Artigo em Inglês | MEDLINE | ID: mdl-28822708

RESUMO

Breast cancer is the leading cause of cancer death in women worldwide which is closely related to metastasis. Our previous study has shown that MRTF-A promote the migration of MDA-MB-231 cells and WDR1 promotes breast cancer cell migration. But the exact molecular mechanism on metastasis is still not fully understood, we now report that WDR1 enhanced the effect of MRTF-A induced-MDA-MB-231 cell migration by promoting the expression of the EMT markers and migration markers via RhoA-MRTF-A signaling pathway. Importantly, WDR1 promoted the nuclear importion of MRTF-A by affecting the expression of nuclear transport protein importin. But WDR1 did not affect the expression of MRTF-A. Interestingly, MRTF-A promoted the expression of miR-206 via its promoter CArG box but miR-206 inhibits the migration of breast cancer cells through suppressing the expression of WDR1 and MRTF-A via targeted their 3'UTR. Our data thus provide important and novel insights into MRTF-A-miR-206-WDR1 form feedback loop to regulate breast cancer cell migration.


Assuntos
Retroalimentação Fisiológica , Regulação Neoplásica da Expressão Gênica , MicroRNAs/genética , Proteínas dos Microfilamentos/genética , Transativadores/genética , Regiões 3' não Traduzidas , Sequência de Bases , Sítios de Ligação , Movimento Celular , Células Epiteliais/metabolismo , Células Epiteliais/patologia , Transição Epitelial-Mesenquimal , Feminino , Humanos , Carioferinas/genética , Carioferinas/metabolismo , Células MCF-7 , MicroRNAs/metabolismo , Proteínas dos Microfilamentos/metabolismo , Regiões Promotoras Genéticas , Transdução de Sinais , Transativadores/metabolismo , Proteína rhoA de Ligação ao GTP/genética , Proteína rhoA de Ligação ao GTP/metabolismo
15.
Am J Drug Alcohol Abuse ; 43(5): 602-608, 2017 09.
Artigo em Inglês | MEDLINE | ID: mdl-28032807

RESUMO

BACKGROUND: Alcohol abuse is a serious health problem worldwide that causes a variety of physical and mental disorders. Research has shown that the brain-derived neurotrophic factor (BDNF) plays an important role in alcohol addiction. The BDNF precursor (proBDNF) exhibits different actions than BDNF through separate receptors and pathways in the central nervous system. However, the effects of proBDNF and BDNF in alcohol addiction are not fully known. OBJECTIVES: The objective was to identify the expression patterns and effects of proBDNF and BDNF after chronic alcohol exposure. METHODS: A total of 40 male adult mice were studied. A mouse psychomotor sensitization (PS) model was established to explore the effects of BDNF and proBDNF treatment following chronic alcohol exposure. Reverse transcription PCR (RT-PCR) was performed to measure mRNA levels for BDNF, TrkB, P75NTR, and sortilin in the prefrontal cortex, hippocampus, and dorsal striatum of Kunming mice after chronic alcohol exposure. RESULTS: In Kunming mice, chronic alcohol exposure up-regulated BDNF and TrkB mRNA levels in the prefrontal cortex, but decreased sortilin and P75 mRNA levels in the dorsal striatum. No changes in mRNA levels were found in other measured brain regions in the alcohol and control groups. CONCLUSION: Chronic alcohol exposure induced the region-specific expression of BDNF and proBDNF and their respective receptors in the brain. These results suggest that BDNF and proBDNF signaling pathways may play major roles in alcohol preference and addiction.


Assuntos
Fator Neurotrófico Derivado do Encéfalo/metabolismo , Corpo Estriado/efeitos dos fármacos , Etanol/administração & dosagem , Hipocampo/efeitos dos fármacos , Córtex Pré-Frontal/efeitos dos fármacos , Receptor trkB/metabolismo , Proteínas Adaptadoras de Transporte Vesicular/metabolismo , Animais , Corpo Estriado/metabolismo , Hipocampo/metabolismo , Masculino , Camundongos , Atividade Motora/efeitos dos fármacos , Córtex Pré-Frontal/metabolismo , Receptores de Fator de Crescimento Neural/metabolismo , Regulação para Cima
16.
J Environ Manage ; 161: 344-349, 2015 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-26203873

RESUMO

Waste oyster shells cause great environmental concerns and nickel is a harmful heavy metal. Therefore, we applied the Taguchi method to take care of both issues by optimizing the controllable factors for Ni(II) removal by calcined oyster shell powders (OSP), including the pH (P), OSP calcined temperature (T), Ni(II) concentration (C), OSP dose (D), and contact time (t). The results show that their percentage contribution in descending order is P (64.3%) > T (18.9%) > C (8.8%) > D (5.1%) > t (1.7%). The optimum condition is pH of 10 and OSP calcined temperature of 900 °C. Under the optimum condition, the Ni(II) can be removed almost completely; the higher the pH, the more the precipitation; the higher the calcined temperature, the more the adsorption. The latter is due to the large number of porosities created at the calcination temperature of 900 °C. The porosities generate a large amount of cavities which significantly increase the surface area for adsorption. A multiple linear regression equation obtained to correlate Ni(II) removal with the controllable factors is: Ni(II) removal(%) = 10.35 × P + 0.045 × T - 1.29 × C + 19.33 × D + 0.09 × t - 59.83. This equation predicts Ni(II) removal well and can be used for estimating Ni(II) removal during the design stage of Ni(II) removal by calcined OSP. Thus, OSP can be used to remove nickel effectively and the formula for removal prediction is developed for practical applications.


Assuntos
Exoesqueleto/química , Níquel/isolamento & purificação , Ostreidae/química , Águas Residuárias/química , Poluentes Químicos da Água/isolamento & purificação , Adsorção , Animais , Concentração de Íons de Hidrogênio , Pós , Temperatura
18.
Fish Physiol Biochem ; 40(1): 193-203, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-23892883

RESUMO

Growth differentiation factor 9 (GDF9) is a member of the transforming growth factorß superfamily and plays an essential role during follicle maturation in mammals. In the present study, the full-length complementary DNA (cDNA) of gdf9 was obtained from Megalobrama amblycephala. The cDNA sequence is 2,061 bp in length with an open reading frame of 1,287 bp encoding 428 amino acid residues. The deduced amino acid sequence shared identities of about 42-86 % with the homologues of other vertebrates. During the early development of embryos, the gdf9 mRNA was detected in zygote with significantly high level and declined sharply by 47 and 87 % at 4 hours post-fertilization (hpf) and 6 hpf and even to an undetectable level through advancing stages. Expression analysis based on quantitative real-time PCR revealed that gdf9 mRNA was mainly expressed in ovary, but much lower levels were also found in some nonovarian tissues. Within the follicle, gdf9 mRNA was localized both in the oocytes and the follicle layer cells by in situ hybridization. During the ovarian cycle, gdf9 mRNA significantly decreased after the previtellogenic stage and became to increase again after the fully grown stage. The results imply that Gdf9 may play critical physiological functions in M. amblycephala early embryonic development and reproduction.


Assuntos
Cyprinidae/fisiologia , Desenvolvimento Embrionário , Fator 9 de Diferenciação de Crescimento/metabolismo , Folículo Ovariano/metabolismo , Sequência de Aminoácidos , Animais , Cyprinidae/embriologia , Cyprinidae/genética , Feminino , Fator 9 de Diferenciação de Crescimento/genética , Hibridização In Situ , Dados de Sequência Molecular , Ovário/crescimento & desenvolvimento , Ovário/metabolismo , Filogenia , Reação em Cadeia da Polimerase em Tempo Real , Análise de Sequência de DNA
19.
Front Pharmacol ; 15: 1337179, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38974037

RESUMO

Background: The effectiveness and safety of using Brucea javanica oil (BJO) in combination with Transarterial Chemoembolization (TACE) for liver cancer treatment are subjects of debate. This study aims to assess the comparative effectiveness and safety of BJO-assisted TACE versus TACE alone and quantifies the differences between these two treatment methods. Methods: A systematic search was conducted in multiple databases including PubMed, Cochrane, CNKI, and Wanfang, until 1 July 2023. Meta-analysis was conducted, and the results were presented as mean difference (MD), risk ratio (RR), and 95% confidence intervals (CI). Results: The search yielded 11 RCTs, with a combined sample size of 1054 patients. Meta-analysis revealed that BJO-assisted TACE exhibited superior outcomes compared to standalone TACE. Specific data revealed that BJO-assisted TACE improves clinical benefit rate by 22% [RR = 1.22, 95% CI (1.15, 1.30)], increases the number of people with improved quality of life by 32%, resulting in an average score improvement of 9.53 points [RR = 1.32, 95% CI (1.22, 1.43); MD = 9.53, 95% CI (6.95, 12.10)]. Furthermore, AFP improvement rate improved significantly by approximately 134% [RR = 2.34, 95% CI (1.58, 3.46)], accompanied by notable improvements in liver function indicators, with an average reduction of 27.19 U/L in AST [MD = -27.19, 95% CI (-40.36, -14.02)], 20.77 U/L in ALT [MD = -20.77, 95% CI (-39.46, -2.08)], 12.17 µmol/L in TBIL [MD = -12.17, 95% CI (-19.38, -4.97)], and a decrease of 43.72 pg/mL in VEGF [MD = -43.72, 95% CI (-63.29, -24.15)]. Most importantly, there was a 29% reduction in the occurrence of adverse reactions [RR = 0.71, 95% CI (0.60, 0.84)]. Conclusion: These findings indicate that BJO-assisted TACE may be considered as a potentially beneficial treatment option for liver cancer patients when compared to standalone TACE. It appears to contribute to improved treatment outcomes, enhanced quality of life, and potentially reduced adverse reactions, suggesting it warrants further investigation as a promising approach for liver cancer treatment. Systematic Review Registration: identifier CRD42023428948.

20.
Adv Sci (Weinh) ; : e2403262, 2024 Jul 08.
Artigo em Inglês | MEDLINE | ID: mdl-38973296

RESUMO

Despite docetaxel combined with cisplatin and 5-fluorouracil (TPF) being the established treatment for advanced nasopharyngeal carcinoma (NPC), there are patients who do not respond positively to this form of therapy. However, the mechanisms underlying this lack of benefit remain unclear. DCAF7 is identified as a chemoresistance gene attenuating the response to TPF therapy in NPC patients. DCAF7 promotes the cisplatin resistance and metastasis of NPC cells in vitro and in vivo. Mechanistically, DCAF7 serves as a scaffold protein that facilitates the interaction between USP10 and G3BP1, leading to the elimination of K48-linked ubiquitin moieties from Lys76 of G3BP1. This process helps prevent the degradation of G3BP1 via the ubiquitin‒proteasome pathway and promotes the formation of stress granule (SG)-like structures. Moreover, knockdown of G3BP1 successfully reversed the formation of SG-like structures and the oncogenic effects of DCAF7. Significantly, NPC patients with increased levels of DCAF7 showed a high risk of metastasis, and elevated DCAF7 levels are linked to an unfavorable prognosis. The study reveals DCAF7 as a crucial gene for cisplatin resistance and offers further understanding of how chemoresistance develops in NPC. The DCAF7-USP10-G3BP1 axis contains potential targets and biomarkers for NPC treatment.

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