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1.
Int J Biol Macromol ; 271(Pt 1): 132523, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38788864

RESUMO

The oral route of administration is considered the optimal choice for treating chronic diseases due to its convenience and non-invasiveness, which can help prevent physical and mental harm to patients undergoing long-term treatment. However, challenges such as safety, gastrointestinal stability, and bioavailability of oral drugs often limit their effectiveness. Natural biomacromolecule micelles, known for their safety, stability, biocompatibility, and diverse functions, have emerged as promising carriers for oral treatment of chronic diseases like systemic lupus erythematosus (SLE) with fat-soluble drugs. This study introduces an innovative approach by developing an oral delivery system using chemically synthesized natural biomacromolecules to load artesunate for treating SLE. By synthesizing amphiphilic polymer micelles from pectin and casein through a carbodiimide reaction, a more stable structure is achieved. The hydrophobic core of these micelles encapsulates artesunate, resulting in the formation of an oral delivery system (PC-AS) with several advantages, including high drug loading and encapsulation efficiency, small particle size, negative potential, strong stability in the gastrointestinal tract, low toxicity and side effects, strong adhesion in the small intestine, and high bioavailability. These advantages facilitate efficient absorption of artesunate in the gastrointestinal tract, leading to improved bioavailability and effective alleviation of SLE-like symptoms in MRL/lpr mice. By utilizing chemically synthesized natural macromolecular micelles for delivering artesunate in the treatment of SLE, this study overcomes the oral barriers associated with the original drug and presents a novel solution for the long-term oral treatment of chronic diseases.


Assuntos
Artesunato , Caseínas , Portadores de Fármacos , Lúpus Eritematoso Sistêmico , Micelas , Pectinas , Pectinas/química , Animais , Administração Oral , Portadores de Fármacos/química , Camundongos , Lúpus Eritematoso Sistêmico/tratamento farmacológico , Artesunato/administração & dosagem , Artesunato/farmacologia , Artesunato/química , Artesunato/farmacocinética , Artesunato/uso terapêutico , Caseínas/química , Caseínas/administração & dosagem , Disponibilidade Biológica , Sistemas de Liberação de Medicamentos , Feminino , Liberação Controlada de Fármacos , Tamanho da Partícula
2.
Sci Total Environ ; 946: 173936, 2024 Oct 10.
Artigo em Inglês | MEDLINE | ID: mdl-38885703

RESUMO

The leaf economics spectrum (LES) describes the covariation of traits relevant for carbon and nutrient economy in different plant species. However, much less is known about the correlation of LES with leaf water economy, not only because some woody species do not follow the rules, but also because they are rarely tested on the widespread, non-native, fast-growing trees. We hypothesized that fast-growing exotic species that spread on the fast side of the LES coordinate their water-use strategies (WUS) to maintain rapid growth, and that the pattern of coordination differs between evergreen and deciduous forests. Using 4 exotic and 4 native species from evergreen and deciduous broadleaf forests in China, we measured 17 traits of LES and WUS and analyzed their functional roles in different species groups. Our results suggest that LES plays a more important role in the coexistence of species within a community, while WUS contributes more to the distribution of species across different regions. The multidimensional coordination of LES and WUS could better explain the growth and distribution of different plant species and shed light on the coexistence of species from different forest types, especially fast-growing woody exotics.


Assuntos
Florestas , Espécies Introduzidas , Folhas de Planta , Árvores , China , Água
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