Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 3 de 3
Mais filtros

Base de dados
Intervalo de ano de publicação
Sheng Wu Gong Cheng Xue Bao ; 37(8): 2658-2667, 2021 Aug 25.
Artigo em Chinês | MEDLINE | ID: mdl-34472286


Lipids are important components of living organisms that participate in and regulate a variety of life activities. Lipids in plants also play important physiological functions in response to a variety of abiotic stresses (e.g. salt stress, drought stress, temperature stress). However, most research on lipids focused on animal cells and medical fields, while the functions of lipids in plants were overlooked. With the rapid development of "omics" technologies and biotechnology, the lipidomics has received much attention in recent years because it can reveal the composition and function of lipids in a deep and comprehensive way. This review summarizes the recent advances in the functions and classification of lipids, the development of lipidomics technology, and the responses of plant lipids against drought stress, salt stress and temperature stress. In addition, challenges and prospects were proposed for future lipidomics research and further exploration of the physiological functions of lipids in plant stress resistance.

Secas , Regulação da Expressão Gênica de Plantas , Lipídeos , Plantas , Estresse Fisiológico
Carbohydr Polym ; 229: 115498, 2020 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-31826492


Controlled release and tumor-selective distribution are highly desirable for anticancer nanomedicines. Here, we design and synthesize an anisamide-conjugated N-octyl-N,O-maleoyl-O-phosphoryl chitosan (a-OMPC) which can form amphiphilic micelles featuring pH-responsive release and high affinity to sigma-1 receptor-overexpressed tumors for paclitaxel (PTX) delivery. Thereinto, maleoyl and phosphoryl groups cooperatively contribute to pH-responsive drug release due to a conversion from hydrophile to hydrophobe in the acidic microenvironment of endo/lysosomes. We demonstrated that PTX-loaded a-OMPC micelles (PTX-aM) enhanced the cellular internalization via the affinity between anisamide and sigma-1 receptor, rapidly released drug in endo/lysosomes and elevated the cytotoxicity against PC-3 cells. The in vivo studies further verified that PTX-aM could largely accumulate at the tumor site even after 24 h of administration, resulting in obvious inhibition effect and prolonged survival period in PC-3 tumor xenograft-bearing mice. Moreover, OMPC showed no obvious hemolytic and acute toxicity. Collectively, this chitosan derivate holds a promising potential in application of prostate cancer-targeted drug delivery system.

Quitosana/química , Interações Hidrofóbicas e Hidrofílicas , Terapia de Alvo Molecular , Paclitaxel/química , Paclitaxel/farmacologia , Neoplasias da Próstata/tratamento farmacológico , Receptores sigma/metabolismo , Animais , Quitosana/toxicidade , Preparações de Ação Retardada , Portadores de Fármacos/química , Portadores de Fármacos/toxicidade , Regulação Neoplásica da Expressão Gênica , Hemólise/efeitos dos fármacos , Humanos , Concentração de Íons de Hidrogênio , Masculino , Teste de Materiais , Camundongos , Micelas , Células PC-3 , Paclitaxel/uso terapêutico , Neoplasias da Próstata/metabolismo , Neoplasias da Próstata/patologia , Ensaios Antitumorais Modelo de Xenoenxerto
Carbohydr Polym ; 92(1): 545-54, 2013 Jan 30.
Artigo em Inglês | MEDLINE | ID: mdl-23218334


In this study, a novel amphiphilic copolymer designed as N-octyl-N-phthalyl-3,6-O-(2-hydroxypropyl) chitosan (OPHPC) were synthesized and then conjugated with folic acid (FA-OPHPC) to produce a targeted drug carrier for tumor-specific drug delivery. OPHPC and FA-OPHPC were characterized by FT-IR, (1)H NMR, (13)C NMR and elemental analysis. Paclitaxel (PTX) loaded OPHPC micelles (PTX-OPHPC) with well-defined spherical shape and homogeneous distribution exhibited drug-loading rate ranging from 33.6% to 45.3% and entrapment efficiency from 50.5% to 82.8%. In the cellular uptake studies, PTX-OPHPC brought about a significantly higher amount of PTX accumulated in human breast adenocarcinoma cell line (MCF-7 cells) compared with Taxol. Moreover, the cellular uptake of PTX in PTX loaded FA-OPHPC micelles (PTX-FA-OPHPC) was 3.2-fold improved in comparison with that of PTX-OPHPC. The results revealed that OPHPC micelle might be a promising drug carrier for promoting PTX cellular uptake and FA-OPHPC micelle could be used as a potential tumor-targeted drug vector.

Quitosana , Portadores de Fármacos , Ácido Fólico , Paclitaxel , Antineoplásicos/administração & dosagem , Antineoplásicos/síntese química , Antineoplásicos/química , Neoplasias da Mama/tratamento farmacológico , Quitosana/administração & dosagem , Quitosana/análogos & derivados , Quitosana/síntese química , Quitosana/química , Portadores de Fármacos/administração & dosagem , Portadores de Fármacos/síntese química , Portadores de Fármacos/química , Feminino , Ácido Fólico/administração & dosagem , Ácido Fólico/síntese química , Ácido Fólico/química , Humanos , Células MCF-7 , Micelas , Paclitaxel/administração & dosagem , Paclitaxel/química , Polímeros/administração & dosagem , Polímeros/síntese química , Polímeros/química