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1.
Acta Pharmacol Sin ; 2021 Sep 14.
Artigo em Inglês | MEDLINE | ID: mdl-34522005

RESUMO

Behavioral sensitization is a progressive increase in locomotor or stereotypic behaviours in response to drugs. It is believed to contribute to the reinforcing properties of drugs and to play an important role in relapse after cessation of drug abuse. However, the mechanism underlying this behaviour remains poorly understood. In this study, we showed that mTOR signaling was activated during the expression of behavioral sensitization to cocaine and that intraperitoneal or intra-nucleus accumbens (NAc) treatment with rapamycin, a specific mTOR inhibitor, attenuated cocaine-induced behavioural sensitization. Cocaine significantly modified brain lipid profiles in the NAc of cocaine-sensitized mice and markedly elevated the levels of phosphatidylinositol-4-monophosphates (PIPs), including PIP, PIP2, and PIP3. The behavioural effect of cocaine was attenuated by intra-NAc administration of LY294002, an AKT-specific inhibitor, suggesting that PIPs may contribute to mTOR activation in response to cocaine. An RNA-sequencing analysis of the downstream effectors of mTOR signalling revealed that cocaine significantly decreased the expression of SynDIG1, a known substrate of mTOR signalling, and decreased the surface expression of GluA2. In contrast, AAV-mediated SynDIG1 overexpression in NAc attenuated intracellular GluA2 internalization by promoting the SynDIG1-GluA2 interaction, thus maintaining GluA2 surface expression and repressing cocaine-induced behaviours. In conclusion, NAc SynDIG1 may play a negative regulatory role in cocaine-induced behavioural sensitization by regulating synaptic surface expression of GluA2.

2.
Exp Ther Med ; 22(2): 897, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-34257710

RESUMO

Chronic heart failure (CHF) and diabetes mellitus are associated with morbidity and mortality. CHF and diabetes generally simultaneously occur, resulting in adverse outcomes. Diabetes complicates cardiomyopathy and exacerbates heart failure conditions. An increase in natriuretic peptides, including atrial natriuretic peptide (ANP), and another endsogenously generated peptide, brain natriuretic peptide (BNP), serves an essential role in CHF. The aim of this study was to explore the molecular regulation between bone morphogenetic protein-2 (BMP-2) and ANP or BNP in diabetes-associated cardiomyopathy. In total, 25 serum samples were collected from patients with CHF with or without type 2 diabetes mellitus to compare with 25 controls. Cardiomyopathy and hyperglycemia were induced in rats by doxorubicin and streptozotocin, respectively. AC16 cells were used to study molecular mechanisms. BMP, ANP and BNP concentration in patients and rats were measured by ELISA. Flow cytometry was performed to analyze cell pyroptosis and ROS production. Reverse transcription-quantitative PCR and western blotting were used to examine mRNA and protein expression of NOD-, LRR- and pyrin domain-containing protein 3 (NLRP3), pro-caspase-1, caspase-1 (p20) and gasdermin D. BMP-2 was negatively correlated with ANP and BNP in CHF patients with type 2 diabetes mellitus. Similar results were obtained in rats and AC16 cells. BMP-2 decreased the NLRP3 inflammasome activation and cell pyroptosis. The present study found evidence that the cardioprotective effects of BMP-2 act through ANP and BNP both in vivo and in vitro. BMP-2 inhibits inflammasome formation. The results suggested that BMP-2 may serve as a novel therapeutic target for the treatment of diabetic heart conditions.

3.
Biomed Pharmacother ; 108: 925-933, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30372904

RESUMO

Isorhamnetin, a flavonoid ingredient derived from Vernonia anthelmintica (L.) Willd., has shown a spectrum of antitumor activity. However, the chemopreventive potential of isorhamnetin on advanced pancreatic cancer and the underlying molecular mechanism remain unknown. In the current study, treatment of the advanced pancreatic adenocarcinoma cell line PANC-1 with isorhamnetin resulted in robust cell growth arrest. PI-annexin V double staining and Hoechst 33258 staining revealed that isorhamnetin moderately induced early apoptosis without morphological alterations of nuclei. Instead, isorhamnetin caused cell cycle S-phase arrest through downregulation of cyclin A. In addition, isorhamnetin decreased the phosphorylation levels of MEK and ERK in the Ras/MAPK pathway, which is involved in regulating cell proliferation, differentiation and apoptosis. Wound-healing experiments demonstrated isorhamnetin significantly reduced the migratory behavior of PANC-1 cells. Altogether, the present study suggests that isorhamnetin may be a potential agent for prevention of pancreatic carcinoma.


Assuntos
Pontos de Checagem do Ciclo Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Neoplasias Pancreáticas/tratamento farmacológico , Quercetina/análogos & derivados , Fase S/efeitos dos fármacos , Apoptose/efeitos dos fármacos , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Regulação para Baixo/efeitos dos fármacos , Humanos , Fosforilação/efeitos dos fármacos , Quercetina/farmacologia , Transdução de Sinais/efeitos dos fármacos
4.
Zhongguo Zhong Yao Za Zhi ; 41(10): 1843-1848, 2016 May.
Artigo em Chinês | MEDLINE | ID: mdl-28895330

RESUMO

In order to determine the scientificalness of traditionally processed Whitmania pigra, water extraction method and bionic extraction method were used respectively to extract the anticoagulating active components in W. pigra hanging dry products, talcum powder fried products and wine immersing-baked products. Activated partial thromboplastin time (APTT), prothrombin time (PT), thrombin time (TT), and antithrombin activity were selected as the activity indexes to evaluate the anticoagulant activities of different processed W. pigra. Then the contents of protein in different processed W. pigra were measured by Coomassie brilliant blue method to preliminarily explain the reason of anticoagulant activity changes. When water extraction method was used, the results of APTT, PT, TT and antithrombin activity showed that the anticoagulant activities of W. pigra were decreased both in talcum powder fried products and wine immersing-baked products, and the activity order was as follows: hanging dried products> wine immersing-baked products>talcum powder fried products. This order was same as the protein content order. While when bionic extraction was used, APTT was shortened in talcum powder fried products, but all the other results indicated the anticoagulant activities of W. pigra processed products were increased, and the activity order was as follows: wine immersing-baked products>talcum powder fried products>hanging dry products. As compared with water extraction, the bionic extraction was more similar to the absorption process of W. pigra in human digestive system after oral administration and was more scientific. Therefore, the traditional processing method can not only modify the taste and smell, but also enhance the anticoagulant activity of W. pigra.


Assuntos
Anticoagulantes/farmacologia , Sanguessugas/química , Animais , Antitrombinas/farmacologia , Biônica , Humanos , Tempo de Tromboplastina Parcial , Tempo de Protrombina , Tempo de Trombina , Água
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