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1.
Adv Mater ; : e2403549, 2024 May 09.
Artículo en Inglés | MEDLINE | ID: mdl-38723270

RESUMEN

It is a pressing need to develop new energy materials to address the existing energy crisis. However, screening optimal targets out of thousands of material candidates remains a great challenge. Herein, an alternative concept for highly effective materials screening based on dual-atom salphen catalysis units, is proposed and validated. Such an approach simplifies the design of catalytic materials and reforms the trial-and-error experimental model into a building-blocks-assembly like process. First, density functional theory (DFT) calculations are performed on a series of potential catalysis units that are possible to synthesize. Then, machine learning (ML) is employed to define the structure-performance relationship and acquire chemical insights. Afterward, the projected catalysis units are integrated into covalent organic frameworks (COFs) to validate the concept Electrochemical tests confirming that Ni-SalphenCOF and Co-SalphenCOF are promising conductive agent-free oxygen evolution reaction (OER) catalysts. This work provides a fast-tracked strategy for the design and development of functional materials, which serves as a potentially workable framework for seamlessly integrating DFT calculations, ML, and experimental approaches.

2.
Cancers (Basel) ; 13(18)2021 Sep 18.
Artículo en Inglés | MEDLINE | ID: mdl-34572904

RESUMEN

T cell acute lymphoblastic leukemia (T-ALL) is one of the most common causes of death in pediatric malignancies. However, the clinical chemotherapy for T-ALL has been limited by numerous side effects, emphasizing that novel anti-T-ALL drugs are urgently needed. Herein, a series of 2-acyl-1-dimethylaminomethyl-ferrocenes for cancer therapy have been evaluated. Among them, F1 and F3 exhibited potent cytotoxicity against T-ALL cell lines, especially Jurkat cells, with low cytotoxicity for normal cells. Further mechanistic studies revealed that F1 and F3 could induce apoptosis in Jurkat cells by destructing mitochondrial membrane, enhancing reactive oxygen species (ROS) generation, decreasing the Bcl-2/Bax ratio, releasing Cytochrome c, and increasing the expression of Cleaved Caspase-9/-3 and Cleaved PARP. Additionally, F1 and F3 could suppress cell proliferation and arrest the cell cycle at G0/G1 phase through the PI3K/Akt/mTOR signaling pathway by down-regulating the expression of CDK6, Cyclin D1, p-Akt, p-GSK-3ß, p-mTOR, p-p70 S6K, and up-regulating the expression of P21 and P27, which would also be a possible mechanism. Consequently, ferrocene derivatives F1 and F3 could induce apoptosis through a mitochondria-dependent pathway mediated by ROS, and cell cycle arrest at G0/G1 phase via the PI3K/Akt/mTOR signaling pathway in Jurkat cells. The present study provided fundamental insights into the clinical application of F1 and F3 for the treatment of T-ALL.

3.
Mar Drugs ; 19(4)2021 Mar 30.
Artículo en Inglés | MEDLINE | ID: mdl-33808126

RESUMEN

Hepatitis B virus (HBV) infection remains a major global health problem. It is therefore imperative to develop drugs for anti-hepatitis B with high-efficiency and low toxicity. Attracted by the observations and evidence that the symptoms of some patients from the Southern Fujian, China, suffering from hepatitis B were alleviated after daily eating an edible marine mollusk, Thais clavigera (Küster 1860) (TCK). Water-soluble polysaccharide from TCK (TCKP1) was isolated and characterized. The anti-HBV activity of TCKP1 and its regulatory pathway were investigated on both HepG2.2.15 cell line and HBV transgenic mice. The data obtained from in vitro studies showed that TCKP1 significantly enhanced the production of IFN-α, and reduced the level of HBV antigens and HBV DNA in the supernatants of HepG2.2.15 cells in a dose-dependent manner with low cytotoxicity. The result of the study on the HBV transgenic mice further revealed that TCKP1 significantly decreased the level of transaminases, HBsAg, HBeAg, and HBV DNA in the serum, as well as HBsAg, HBeAg, HBV DNA, and HBV RNA in the liver of HBV transgenic (HBV-Tg) mice. Furthermore, TCKP1 exhibited equivalent inhibitory effect with the positive control tenofovir alafenamide (TAF) on the markers above except for HBV DNA even in low dosage in a mouse model. However, the TCKP1 high-dose group displayed stronger inhibition of transaminases and liver HBsAg, HBeAg, and HBV RNA when compared with those of TAF. Meanwhile, inflammation of the liver was, by pathological observation, relieved in a dose-dependent manner after being treated with TCKP1. In addition, elevated levels of interleukin-12 (IL-12) and interferon γ (IFN-γ), and reduced level of interleukin-4 (IL-4) in the serum were observed, indicating that the anti-HBV effect of TCKP1 was achieved by potentiating immunocyte function and regulating the balance of Th1/Th2 cytokines.


Asunto(s)
Antivirales/farmacología , Virus de la Hepatitis B/efectos de los fármacos , Hepatitis B/tratamiento farmacológico , Moluscos/metabolismo , Polisacáridos/farmacología , Animales , Antivirales/aislamiento & purificación , Citocinas/metabolismo , Modelos Animales de Enfermedad , Células Hep G2 , Hepatitis B/inmunología , Hepatitis B/metabolismo , Hepatitis B/virología , Virus de la Hepatitis B/genética , Virus de la Hepatitis B/inmunología , Interacciones Huésped-Patógeno , Humanos , Mediadores de Inflamación/metabolismo , Ratones Transgénicos , Polisacáridos/aislamiento & purificación , Balance Th1 - Th2/efectos de los fármacos , Carga Viral
4.
Int J Mol Sci ; 22(6)2021 Mar 18.
Artículo en Inglés | MEDLINE | ID: mdl-33803555

RESUMEN

In this study, detailed information on hepatocellular carcinoma (HCC) cells (HepG-2, SMMC-7721, and HuH-7) and normal human liver cell L02 treated by ferrocene derivatives (compounds 1, 2 and 3) is provided. The cell viability assay showed that compound 1 presented the most potent and selective anti-HCC activity. Further mechanism study indicated that the proliferation inhibition effect of compound 1 was associated with the cycle arrest at the G0/G1 phase and downregulation of cyclin D1/CDK4. Moreover, compound 1 could induce apoptosis in HCC cells by loss of mitochondrial membrane potential (ΔΨm), accumulation of reactive oxygen species (ROS), decrease in Bcl-2, increase in BAX and Bad, translocation of Cytochrome c, activation of Caspase-9, -3, and cleavage of PARP. These results indicated that compound 1 would be a promising candidate against HCC through G0/G1 cell cycle arrest-related proliferation inhibition and mitochondrial pathway-dependent apoptosis.


Asunto(s)
Apoptosis/efectos de los fármacos , Carcinoma Hepatocelular/patología , Compuestos Ferrosos/farmacología , Puntos de Control de la Fase G1 del Ciclo Celular/efectos de los fármacos , Neoplasias Hepáticas/patología , Metalocenos/farmacología , Mitocondrias/metabolismo , Línea Celular Tumoral , Supervivencia Celular/efectos de los fármacos , Citocromos c/metabolismo , Humanos , Potencial de la Membrana Mitocondrial/efectos de los fármacos , Mitocondrias/efectos de los fármacos , Modelos Biológicos , Especies Reactivas de Oxígeno/metabolismo , Fase de Descanso del Ciclo Celular/efectos de los fármacos
5.
Curr Gene Ther ; 21(1): 72-80, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33183200

RESUMEN

BACKGROUND: Lung cancer remains the most common cause of cancer-related deaths in China and worldwide. Traditional surgery and chemotherapy do not offer an effective cure, although gene therapy may be a promising future alternative. Kallistatin (Kal) is an endogenous inhibitor of angiogenesis and tumorigenesis. Recombinant adeno-associated virus (rAAV) is considered the most promising vector for gene therapy of many diseases due to persistent and long-term transgenic expression. OBJECTIVE: The aim of this study was to investigate whether rAAV9-Kal inhibited NCI-H446 subcutaneous xenograft tumor growth in mice. METHODS: The subcutaneous xenograft mode was induced by subcutaneous injection of 2×107 H446 cells into the dorsal skin of BALB/c nude mice. The mice were administered with ssrAAV9-Kal (single- stranded rAAV9) or dsrAAV9-Kal (double-stranded rAAV9) by intraperitoneal injection (I.P.). Tumor microvessel density (MVD) was examined by anti-CD34 staining to evaluate tumor angiogenesis. RESULTS: Compared with the PBS (blank control) group, tumor growth in the high-dose ssrAAV9-Kal group was inhibited by 40% by day 49, and the MVD of tumor tissues was significantly decreased. CONCLUSION: The results indicate that this therapeutic strategy is a promising approach for clinical cancer therapy and implicate rAAV9-Kal as a candidate for gene therapy of lung cancer.


Asunto(s)
Terapia Genética/métodos , Vectores Genéticos/metabolismo , Neoplasias Pulmonares/tratamiento farmacológico , Neoplasias Pulmonares/metabolismo , Serpinas/metabolismo , Serpinas/uso terapéutico , Animales , Carcinoma de Células Pequeñas/tratamiento farmacológico , Carcinoma de Células Pequeñas/metabolismo , Línea Celular Tumoral , Dependovirus/genética , Células HEK293 , Humanos , Ratones , Ratones Endogámicos BALB C , Ratones Desnudos , Serpinas/genética , Ensayos Antitumor por Modelo de Xenoinjerto
6.
PLoS Pathog ; 16(7): e1008664, 2020 07.
Artículo en Inglés | MEDLINE | ID: mdl-32678826

RESUMEN

Establishing latent infection but retaining the capability to reactivate in certain circumstance is an ingenious tactic for retroviruses to persist in vivo while evading host immune surveillance. Many evidences indicate that Human T-cell leukemia virus type 1 (HTLV-1) is not completely silent in vivo. However, signals that trigger HTLV-1 latency-reactivation switching remain poorly understood. Here, we show that aryl hydrocarbon receptor (AHR), a ligand-activated transcription factor, plays a critical role in HTLV-1 plus-strand expression. Importantly, HTLV-1 reactivation could be tunably manipulated by modulating the level of AHR ligands. Mechanistically, activated AHR binds to HTLV-1 LTR dioxin response element (DRE) site (CACGCATAT) and drives plus-strand transcription. On the other hand, persistent activation of nuclear factor kappa B (NF-κB) pathway constitutes one key prerequisite for AHR overexpression in HTLV-1 infected T-cells, setting the stage for the advent of AHR signaling. Our findings suggest that HTLV-1 might achieve its reactivation in vivo when encountering environmental, dietary, microbial and metabolic cues that induce sufficient AHR signaling.


Asunto(s)
Factores de Transcripción con Motivo Hélice-Asa-Hélice Básico/metabolismo , Infecciones por HTLV-I/virología , Virus Linfotrópico T Tipo 1 Humano/metabolismo , Receptores de Hidrocarburo de Aril/metabolismo , Activación Viral/fisiología , Latencia del Virus/fisiología , Línea Celular , Infecciones por HTLV-I/metabolismo , Humanos , Linfocitos T/virología
7.
Front Biosci (Landmark Ed) ; 25(6): 1184-1201, 2020 03 01.
Artículo en Inglés | MEDLINE | ID: mdl-32114429

RESUMEN

N6-methyladenosine (m6A) modification, which alters gene expression, is the most prevalent internal modification of eukaryotic mRNA. m6A modification is dynamic and reversible that is regulated by three associated protein groups: methyltransferases or writers, demethylases or erasers, and m6A-binding proteins or readers. m6A modification is involved in all phases of RNA life, from RNA folding and structure, stability, splicing, nuclear export, translational modulation to RNA degradation. Recent findings show that the abnormal level of m6A modification causes aberrant expression of important viral genes. Here, we reviewe m6A role in gene expression and its contribution to the development  of human viral diseases. Particularly, we would focus on viruses associated with human diseases including HIV-1, IAV, HBV, HCV, EBV and so on to find a novel approach and provide a new sight for the innovative treatment of human viral diseases.


Asunto(s)
Adenosina/análogos & derivados , ARN Viral/genética , Virosis/genética , Virus/genética , Adenosina/metabolismo , Humanos , Metilación , Metiltransferasas/genética , Metiltransferasas/metabolismo , Pliegue del ARN , Estabilidad del ARN , ARN Viral/química , ARN Viral/metabolismo , Proteínas de Unión al ARN/genética , Proteínas de Unión al ARN/metabolismo , Virosis/metabolismo , Virosis/virología , Virus/metabolismo
8.
Mar Drugs ; 18(3)2020 Mar 12.
Artículo en Inglés | MEDLINE | ID: mdl-32178323

RESUMEN

The aims of this study were to investigate the antioxidant, hypolipidemic and hepatic protective effects of Phascolosoma esculenta polysaccharides (PEP). PEP was prepared from Phascolosoma esculenta by enzyme hydrolysis and its characterization was analyzed. The antioxidant activities of PEP were evaluated by the assays of scavenging 1,1-Diphenyl-2-picrylhydrazyl (DPPH), superoxide anion, hydroxyl radicals and chelating ferrous ion in vitro. It showed that PEP could scavenge radicals effectively and had favorable antioxidant activities. In the meantime, the hypolipidemic effect of PEP was investigated in vivo by using mice model fed with high-fat diet with or without PEP treatment. Compared with the hyperlipidemic mice without treatment, the serum levels of total cholesterol (TC) (30.1-35.7%, p < 0.01), triglyceride (TG) (24.5-50.8%, p < 0.01 or p < 0.05), low-density lipoprotein cholesterol (LDL-C) (49.6-56.8%, p < 0.01) and liver levels of TC (21.0-28.4%, p < 0.01), TG (23.8-37.0%, p < 0.01) decreased significantly, whereas serum high-density lipoprotein cholesterol (HDL-C) (47.7-59.9%, p < 0.01 or p < 0.05) increased significantly after treatment with different dosage of PEP (0.2, 0.4 and 0.8 g per kg body weight, respectively). In addition, superoxide dismutase (SOD) (10.2-22.2% and 18.8-26.9%, p < 0.05), glutathione peroxidase (GSH-Px) (11.9-15.4% and 26.6-30.4%, p < 0.05) activities in serum and liver enhanced markedly while aspartate aminotransferase (AST) (18.7-29.6% and 42.4-58.0%, p < 0.05), alanine transaminase (ALT) (42.7-46.0% and 31.2-42.2%, p < 0.05) activities, as well as the levels of malondialdehyde (MDA) (15.9-24.4% and 15.0-16.8%, p < 0.01 or p < 0.05) in serum and liver reduced markedly. Moreover, the histopathological observation of livers indicated that PEP could attenuate liver cell injury. The animal experimental results demonstrated that PEP exerted hypolipidemic and hepatoprotective roles in hyperlipidemic mice. In summary, our results above suggest that PEP might be a potential natural antioxidant and utilized as a therapeutic candidate for hyperlipidemia.


Asunto(s)
Antioxidantes/farmacología , Enfermedad Hepática Inducida por Sustancias y Drogas/prevención & control , Hipolipemiantes/farmacología , Polisacáridos/farmacología , Sustancias Protectoras/farmacología , Animales , Peso Corporal/efectos de los fármacos , Dieta Alta en Grasa , Depuradores de Radicales Libres/química , Depuradores de Radicales Libres/farmacología , Quelantes del Hierro/farmacología , Lípidos/sangre , Masculino , Ratones , Polisacáridos/química , Polisacáridos/uso terapéutico
9.
Molecules ; 24(24)2019 Dec 12.
Artículo en Inglés | MEDLINE | ID: mdl-31842361

RESUMEN

Schefflera heptaphylla (L.) Frodin, are commonly used in anti-inflammatory, analgesic, traumatic bleeding and hemostasisas. In this paper, the coagulation effect of the ethanol extract (Set), ethyl acetate phase (Sea) and n-butanol phase (Sbu) was evaluated by prothrombin time (PT), activated partial thromboplastin time (APTT), thrombin time (TT) and fibrinogen content (FIB) assays in vitro. Then, Three main lupanine triterpenes (compounds A-C) were isolated and identified from Sea and Sbu by a bioassay-guided method and their structure were identified as 3α-Hydroxy-lup-20(29)-ene-23, 28-dioic acid, betulinic acid 3-O-sulfate and 3α-Hydroxy-lup-20(29)-ene-23, 28-dioic acid 28-O-(α-l-rhamnopyranosyl(1→4)-O-ß-d-glucopyranosyl(1→6))-ß-d-glucopyranoside) by spectroscopic data analysis. Among of them, compound B was confirmed to have significant coagulant effect in vitro. Furthermore, the pro-coagulation mechanism of S. heptaphylla extracts and compound B were investigated by measuring whole blood viscosity (WBV), plasma viscosity (PV), erythrocyte sedimentetion rate (ESR), pack cell volume (PCV), APTT, PT, TT, and FIB in vivo. Meanwhile, the levels of thromboxane B2 (TXB2), 6-keto prostaglandin F1α (6-keto-PGF1α), endothelial nitric oxide synthase (eNOS) and (endothelin-1) ET-1 were detected. The bleeding time (BT) was tested by tail bleeding method, which proved the traumatic bleeding and hemostasis activities of S. heptaphylla. The pharmacology experiments showed that the Set, Sea, Sbu and compound B has significant pro-coagulation effect. In addition, compound B might be the main constituent of pro-coagulation in S. heptaphylla These results could support the fact that S. heptaphylla could be used traditionally to cure traumatic bleeding, and the pro-coagulation effects were associated with the regulation of vascular endothelium active substance and hemorheology parameters.


Asunto(s)
Araliaceae/química , Coagulación Sanguínea/efectos de los fármacos , Coagulantes , Hemorragia , Animales , Coagulantes/química , Coagulantes/farmacología , Endotelina-1/sangre , Femenino , Hemorragia/sangre , Hemorragia/tratamiento farmacológico , Masculino , Óxido Nítrico Sintasa de Tipo III/sangre , Tiempo de Tromboplastina Parcial , Tiempo de Protrombina , Ratas , Ratas Sprague-Dawley , Tromboxano B2/sangre
10.
Virol J ; 16(1): 133, 2019 11 11.
Artículo en Inglés | MEDLINE | ID: mdl-31711514

RESUMEN

BACKGROUND: N6-methyladenosine (m6A) modification is the most prevalent internal modification of eukaryotic mRNA modulating gene expression. m6A modification is a dynamic reversible process regulated by three protein groups: methyltransferases (writers), demethylases (erasers), and m6A-binding proteins (readers). m6A modification is involved in all phases of RNA metabolism, including RNA folding, stability, splicing, nuclear exporting, translational modulation and degradation. MAIN BODY: In recent years, numerous studies have reported that abnormal m6A modification causes aberrant expression of important viral genes. Herein, we review the role of m6A in viral lifecycle and its contribution to the pathogenesis of human diseases. Particularly, we focus on the viruses associated with human diseases such as HIV-1, IAV, HBV, HCV, EBV and many others. CONCLUSIONS: A better understanding of m6A-virus relationship would provide new insights into the viral replication process and pathogenesis of human diseases caused by viruses. In addition, exploration of the role of m6A in disease-causing viruses will reveal novel approaches for the treatment of such diseases.


Asunto(s)
Adenosina/análogos & derivados , Virosis/virología , Fenómenos Fisiológicos de los Virus , Adenosina/metabolismo , Animales , Regulación Viral de la Expresión Génica , Humanos , Procesamiento Postranscripcional del ARN , ARN Viral/metabolismo , Replicación Viral , Virus/genética
11.
Molecules ; 24(16)2019 Aug 14.
Artículo en Inglés | MEDLINE | ID: mdl-31416166

RESUMEN

Schefflera octophylla (Lour.) Harms, a kind of traditional Chinese medicine (TCM), is commonly used for anti-inflammatory, analgesic, rheumatism, fever, and hemostasis therapy. In our previous studies, two major triterpenoids were isolated and identified from leaves of S. octophylla, and evaluated for their inhibitory effects on lipopolysaccharide (LPS)-induced nitric oxide production in RAW264.7 cells; both of them displayed significant anti-inflammatory activities at their noncytotoxic concentrations. Therefore, it is very useful to establish an efficient and green extraction method to isolated the two major triterpenoids from leaves of S. octophylla. In this paper, ionic liquid based ultrasonic-assisted extraction (ILUAE) was successfully applied to extract the two major triterpenoids from leaves of S. octophylla. Four single factors (ionic liquids (ILs) concentration, solid-liquid ratio, centrifugal speed, mesh number), with a greater impact on extraction rate, were selected from a variety of influencing factors, and the optimal conditions were obtained by Box-Behnken response surface methodology (RSM). Under optimal conditions, the total extraction yield and extraction rate of two triterpenoids were 288.03 mg/g and 28.80%, respectively, which was 6.80% higher than that of 70% Ethanol (220 mg/g and 22%, respectively).


Asunto(s)
Antiinflamatorios/química , Antiinflamatorios/farmacología , Araliaceae/química , Fraccionamiento Químico , Extractos Vegetales/química , Extractos Vegetales/farmacología , Hojas de la Planta/química , Animales , Antiinflamatorios/aislamiento & purificación , Línea Celular , Supervivencia Celular/efectos de los fármacos , Fraccionamiento Químico/métodos , Líquidos Iónicos , Ratones , Estructura Molecular , Óxido Nítrico/metabolismo , Extractos Vegetales/aislamiento & purificación , Células RAW 264.7 , Reproducibilidad de los Resultados , Ondas Ultrasónicas
12.
Biochem Biophys Res Commun ; 512(3): 598-603, 2019 05 07.
Artículo en Inglés | MEDLINE | ID: mdl-30914196

RESUMEN

Human T-cell leukemia virus 1 (HTLV-1), an oncogenic retrovirus, and Notch1 signaling, implicated in tumor formation and progression, are both associated with the development of adult T-cell leukemia (ATL). Here we explored the possibility of a mechanistic link between the two. We observed that the expression of Notch intracellular domain (NICD) was elevated in HTLV-1 infected cell lines. Knocking down of Notch1 in ATL cells repressed cellular proliferation and tumor formation both in vitro and in vivo. As a mechanism for these actions, we found that Tax activated Notch1 signaling by prolonging the half-life of NICD. We then showed that Tax, NICD, and RBP-jκ formed a ternary complex, that Tax enhanced the association of NICD with RBP-jκ, and that Tax, NICD, and RBP-jκ were bound to RBP-jκ-responsive elements. Hence, our results suggest that HTLV-1 promotes cellular proliferation and tumor formation of ATL cells by modulating Notch signaling via a posttranslational mechanism that involves interactions between Tax, NICD, and RBP-jκ.


Asunto(s)
Infecciones por HTLV-I/complicaciones , Virus Linfotrópico T Tipo 1 Humano/fisiología , Leucemia-Linfoma de Células T del Adulto/metabolismo , Leucemia-Linfoma de Células T del Adulto/virología , Receptor Notch1/metabolismo , Adulto , Proliferación Celular , Infecciones por HTLV-I/metabolismo , Interacciones Huésped-Patógeno , Humanos , Células Jurkat , Leucemia-Linfoma de Células T del Adulto/patología , Transducción de Señal
13.
Int J Mol Sci ; 20(1)2018 Dec 27.
Artículo en Inglés | MEDLINE | ID: mdl-30591689

RESUMEN

Prostate cancer (PCa) is a major health problem in males. Metastasis-associated with lung adenocarcinoma transcript-1 (MALAT1), which is overexpressed in PCa tissue, is associated with physiological and pathological conditions of PCa. M2 macrophages are major immune cells abundant in the tumor microenvironment. However, it remains unknown whether M2 macrophages are involved in the effects or not, and molecular mechanisms of MALAT1 on PCa progression have not yet been comprehensively explored. Here we reported that, M2 macrophages (PMA/IL-4 treated THP1) induced MALAT1 expression in PCa cell lines. Knockdown MALAT1 expression level in PCa cell lines inhibited cellular proliferation, invasion, and tumor formation. Further mechanistic dissection revealed that M2 macrophages secreted IL-8 was sufficient to drive up MALAT1 expression level via activating STAT3 signaling pathway. Additional chromatin immunoprecipitation (ChIP) and luciferase reporter assays displayed that STAT3 could bind to the MALAT1 promoter region and transcriptionally stimulate the MALAT1 expression. In summary, our present study identified the IL-8/STAT3/MALAT1 axis as key regulators during prostate tumorigenesis and therefore demonstrated a new mechanism for the MALAT1 transcriptional regulation.


Asunto(s)
Interleucina-8/metabolismo , ARN Largo no Codificante/metabolismo , Factor de Transcripción STAT3/metabolismo , Anticuerpos/inmunología , Anticuerpos/farmacología , Sitios de Unión , Línea Celular Tumoral , Supervivencia Celular/efectos de los fármacos , Humanos , Interleucina-8/inmunología , Macrófagos/citología , Macrófagos/metabolismo , Masculino , Fosfatidilinositol 3-Quinasas/metabolismo , Fosforilación , Regiones Promotoras Genéticas , Neoplasias de la Próstata/metabolismo , Neoplasias de la Próstata/patología , Unión Proteica , Proteínas Proto-Oncogénicas c-akt/metabolismo , Interferencia de ARN , ARN Largo no Codificante/antagonistas & inhibidores , ARN Largo no Codificante/genética , ARN Interferente Pequeño/metabolismo , Factor de Transcripción STAT3/química , Factor de Transcripción STAT3/genética , Transducción de Señal
14.
Zhongguo Zhong Yao Za Zhi ; 43(17): 3451-3459, 2018 Sep.
Artículo en Chino | MEDLINE | ID: mdl-30347911

RESUMEN

Hyperlipidemia is a systemic chronic metabolic disease caused by dyslipidemia in the body. It is an important risk factor of accelerating atherosclerosis, which will cause coronary heart disease, thrombus and other cardiovascular diseases, so it is a "invisible killer" for human health. Controlling and lowering blood lipids can reduce the risk of cardiovascular and cerebrovascular diseases. The current therapies for hyperlipidemia mainly include chemical synthetic medicines. However, long-term use of hypolipidemic drugs would cause various side effects, and the demand of effective and nontoxic drugs for hyperlipidemia patients is eager. Polysaccharide has attracted worldwide concerns due to its characteristics of good biocompatibility and less side effects. Polysaccharide is a kind of biological macromolecule which is widely found in plant cell walls, animal cell membranes and microorganism cell walls. A number of studies have shown that polysaccharides from natural materials have broad biological activities, such as anti-tumor, immunomodulatory, antioxidant, hypoglycemic, and hypolipidemic effects, with broad application prospect. This paper has reviewed and summarized the polysaccharides with hypolipidemic effect and their mechanisms which have been reported at home and abroad, hoping to provide certain reference for their development and application in lowering blood lipids.


Asunto(s)
Productos Biológicos/farmacología , Hiperlipidemias/tratamiento farmacológico , Hipolipemiantes/farmacología , Polisacáridos/farmacología , Animales , Humanos
15.
NPJ Vaccines ; 3: 29, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30062066

RESUMEN

Current design of Zika virus (ZIKV) vaccine mainly considered envelope (E) as the major target antigen. Non-structural protein NS1 was seldom considered. Herein, we generated three adenovirus-vectored vaccines carrying E (Ad2-E), or premembrane/membrane (prM/M) with E (Ad2-prME), or NS1 in addition to prM/M with E (Ad2-prME-NS1). Ad2-prME induced higher neutralizing antibody response to ZIKV than Ad2-E, suggesting prM/M is important for the folding of immunogenic E. Most intriguingly, Ad2-prME-NS1 elicited the best viral inhibition when the immune sera were added to ZIKV-infected cells. In ZIKV-challenged neonatal mice born to maternally immunized dams, Ad2-prME-NS1 conferred the best protection in preventing weight loss, neurological disorders, and viral replication. Ad2-prME also conferred significant protection but was less effective than Ad2-prME-NS1, whereas Ad2-E only alleviated neurological symptoms but did not inhibit viral replication. Our study suggested that NS1 should be considered in the design of ZIKV vaccine in addition to prM/M and E.

16.
Mol Ther Methods Clin Dev ; 4: 149-158, 2017 Mar 17.
Artículo en Inglés | MEDLINE | ID: mdl-28345000

RESUMEN

Adeno-associated virus (AAV) vectors have emerged as a safe and efficient gene therapy platform. One complication is that a significant amount of empty particles have always been generated as impurities during AAV vector production. However, the effects of such particles on AAV vector performance remain unclear. Here we systemically evaluated the biological properties of three types of "empty" AAV particles: syngeneic pseudo-vectors with partial AAV genomes derived from DNA of the corresponding full particles, allogeneic pseudo-vectors with partial genomes different from the corresponding full particles, and null pseudo-vectors with no DNA inside the capsids. The syngeneic particles in excess increased the corresponding full AAV vector transgene expression both in vivo and in vitro. However, such effects were not observed with null or allogeneic particles. The observed differences among these pseudo-AAV particles may be ascribed to the syngeneic pseudo-vector DNA facilitating the complementary DNA synthesis of the corresponding full AAV particles. Our study suggests that the DNA content in the pseudo-vectors plays a key role in dictating their effects on AAV transduction. The effects of residual "empty" particles should be adequately assessed when comparing AAV vector performance. The syngeneic AAV pseudo-vectors may be used to enhance the efficacy of gene therapy.

17.
Hum Gene Ther ; 27(12): 971-981, 2016 12.
Artículo en Inglés | MEDLINE | ID: mdl-27550145

RESUMEN

Recombinant adeno-associated viral (rAAV) vectors have recently achieved clinical successes in human gene therapy. However, the commonly observed, heavier particles found in rAAV preparations have traditionally been ignored due to their reported low in vitro transduction efficiency. In this study, the biological properties of regular and high-density rAAV serotype 8 vectors, rAAVRD and rAAVHD, were systemically compared. Results demonstrated that both rAAVRD and rAAVHD exhibited similar DNA packaging profiles, while rAAVHD capsids contained fewer VP1 and VP2 proteins, indicating that the rAAVHD particles contained a higher DNA/protein ratio than that of rAAVRD particles. Dynamic light scattering and transmission electron microscopy data revealed that the diameter of rAAVHD was smaller than that of rAAVRD. In vitro, rAAVHD was two- to fourfold less efficient in transduction compared with rAAVRD. However, the transduction performance of rAAVHD and rAAVRD was similar in vivo. No significant difference in neutralizing antibody formation against rAAVRD and rAAVHD was observed, suggesting that the surface epitopes of rAAVRD and rAAVHD are congruent. In summary, the results of this study demonstrate that rAAVRD and rAAVHD are equally competent for in vivo transduction, despite their difference in vitro. Therefore, the use of rAAVHD vectors in human gene therapy should be further evaluated.


Asunto(s)
Proteínas de la Cápside/genética , Dependovirus/genética , Receptores ErbB/genética , Terapia Genética , Vectores Genéticos/administración & dosificación , Hemofilia A/terapia , Transducción Genética , Animales , Femenino , Hemofilia A/genética , Humanos , Masculino , Ratones Endogámicos BALB C , Ratones Endogámicos C57BL , Transgenes
18.
Bioorg Med Chem Lett ; 26(9): 2375-9, 2016 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-26995526

RESUMEN

7-Hydroxy-2-methoxy-phenanthrene-3,4-dione and 3',7',7-trihydroxy-2,2',4'-trimethoxy-[1,8'-biphenanthrene]-3,4-dione, two novel compounds and four known compounds were isolated from Bletilla striata. The structures of the compounds were established on the basis of extensive spectroscopic analysis. The two compounds exhibited antiproliferative effects using the MTT test; these effects may be due to cell cycle arrest and inducing ROS generation.


Asunto(s)
Antineoplásicos Fitogénicos/farmacología , Orchidaceae/química , Quinonas/farmacología , Antineoplásicos Fitogénicos/aislamiento & purificación , Línea Celular Tumoral , Humanos , Quinonas/aislamiento & purificación
19.
Arch Pharm (Weinheim) ; 349(3): 186-92, 2016 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-26841261

RESUMEN

The antiproliferative effects of various ferrocenyl olefins were evaluated against the cell lines MCF-7 (human breast cancer cells), DLD-1 (human colon adenocarcinoma cells), HUVEC (human umbilical vein endothelial cells), and A549 (human lung carcinoma cells), using the MTT test. IC50 values were determined. Compounds 8, 9, 11, and 12 with high antiproliferative activity were tested for their reactive oxygen species (ROS) production, and cell cycle analysis was performed on A549 cells. The results show that these compounds might perform their antiproliferative activity through inducing ROS generation, apoptosis induction, and cell cycle arrest.


Asunto(s)
Alquenos/química , Antineoplásicos/química , Apoptosis/efectos de los fármacos , Compuestos Ferrosos/química , Especies Reactivas de Oxígeno/metabolismo , Alquenos/síntesis química , Alquenos/farmacología , Antineoplásicos/síntesis química , Antineoplásicos/farmacología , Puntos de Control del Ciclo Celular/efectos de los fármacos , Línea Celular Tumoral , Proliferación Celular/efectos de los fármacos , Ensayos de Selección de Medicamentos Antitumorales , Compuestos Ferrosos/síntesis química , Compuestos Ferrosos/farmacología , Células Endoteliales de la Vena Umbilical Humana , Humanos , Metalocenos , Relación Estructura-Actividad
20.
Am J Transl Res ; 8(12): 5141-5150, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-28077991

RESUMEN

Prostate cancer (PCa) is the second lethal disease for men in western countries. Although androgen receptor (AR) signaling has been widely investigated, noncoding RNAs (ncRNAs), deficient of open reading frame, have also received considerable attention. Growing studies showed that the aberrant ncRNAs expression contributed to cell proliferation, metastasis and drug resistance in PCa. Therefore, therapeutically targeting ncRNAs may synergize androgen deprivation therapy (ADT) to have a better effect to fight against PCa, especially castration-resistant prostate cancer (CRPC). This review would systematically summarize the multicellular events controlled by ncRNAs and give a snapshot of future scientific activities and clinical applications.

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