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1.
Molecules ; 25(6)2020 Mar 19.
Artigo em Inglês | MEDLINE | ID: mdl-32204524

RESUMO

Five 8,17-epoxybriaranes, including three new compounds-briarenols I-K (1-3), along with two known analogues, briaexcavatolide P (4) and briaexcavatin P (5), were isolated from the octocoral Briareum excavatum. The structures of briaranes 1-3 were elucidated by spectroscopic methods, including 1D and 2D NMR studies and (+)-HRESIMS. Briarane 4 exerted inhibition effects on inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) release from RAW 264.7.

2.
Mar Drugs ; 18(2)2020 Jan 24.
Artigo em Inglês | MEDLINE | ID: mdl-31991544

RESUMO

In the current study, an NMR spectroscopic pattern-based procedure for probing scalarane derivatives was performed and four new 24-homoscalaranes, lendenfeldaranes A-D (1- 4), along with three known compounds, 12α-acetoxy-22-hydroxy-24-methyl-24-oxoscalar-16-en- 25-al (5), felixin F (6), and 24-methyl-12,24,25-trioxoscalar-16-en-22-oic acid (7) were isolated from the sponge Lendenfeldia sp. The structures of scalaranes 1-7 were elucidated on the basis of spectroscopic analysis. Scalaranes 1-7 were further evaluated for their cytotoxicity toward a series of human cancer cell lines and the results suggested that 5 and 7 dominated in the anti- proliferative activity of the extract. The 18-aldehyde functionality was found to play a key role in their activity.

3.
Mar Drugs ; 17(9)2019 Sep 11.
Artigo em Inglês | MEDLINE | ID: mdl-31514359

RESUMO

Two new steroids, dendronesterones D (1) and E (2), featuring with 1,4-dienone moiety, along with three known steroids, methyl 3-oxochola-4,22-diene-24-oate (3), 5α,8α-epidioxy-24(S)- methylcholesta-6,22-dien-3ß-ol (4), and 5α,8α-epidioxy-24(S)-methylcholesta-6,9(11),22-trien-3ß-ol (5), were isolated from an octocoral Dendronephthya sp. The structures of steroids 1 and 2 were elucidated by using spectroscopic methods and steroid 1 was found to exhibit significant in vitro anti-inflammatory activity in lipopolysaccharides (LPS)-induced RAW264.7 macrophage cells by inhibiting the expression of the iNOS protein.


Assuntos
Antozoários/química , Anti-Inflamatórios/farmacologia , Esteroides/farmacologia , Animais , Anti-Inflamatórios/isolamento & purificação , Camundongos , Estrutura Molecular , Óxido Nítrico Sintase Tipo II/antagonistas & inibidores , Células RAW 264.7 , Esteroides/isolamento & purificação
4.
Mar Drugs ; 17(9)2019 Sep 14.
Artigo em Inglês | MEDLINE | ID: mdl-31540107

RESUMO

Three new 8-hydroxybriaranes-fragilides R-T (1-3) were obtained from a sea whip gorgonian coral Junceella fragilis. The structures of briaranes 1-3 were elucidated by using spectroscopic methods, including 1D (1H and 13C NMR), 2D (COSY, HSQC, HMBC, and NOESY experiments) NMR studies, and (+)-HRESIMS. Fragilides S and T (2 and 3) are the only briaranes known to possess 8α-hydroxy and 17ß-methyl groups, respectively. Briarane 2 exerted an inhibition effect on iNOS release from RAW264.7; a macrophage cell line that originated from a mouse monocyte macrophage, stimulated with lipopolysaccharides.


Assuntos
Antozoários/química , Anti-Inflamatórios/farmacologia , Diterpenos/farmacologia , Animais , Anti-Inflamatórios/química , Anti-Inflamatórios/isolamento & purificação , Diterpenos/química , Diterpenos/isolamento & purificação , Camundongos , Estrutura Molecular , Óxido Nítrico Sintase Tipo II/antagonistas & inibidores , Óxido Nítrico Sintase Tipo II/metabolismo , Espectroscopia de Prótons por Ressonância Magnética , Células RAW 264.7 , Relação Estrutura-Atividade
5.
Sci China C Life Sci ; 52(6): 545-50, 2009 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-19557332

RESUMO

Influenza A virus NS1 protein is an important regulatory factor with multiple functions and contributes greatly to viral pathogenesis. In the present study, transcription-activating potential of NS1 from different influenza A virus subtypes was examined in yeast two-hybrid system. The bait vectors containing different NS1 genes, along with an empty prey vector, were transformed into yeast AH109(for growth assay on QDO plate and alpha-galactosidase assay), and Y187(for beta-galactosidase assay). AH109 transformants with NS1 gene from H1N1, H5N1, and H9N2 viruses grew vigorously on the QDO plate and secreted high level of alpha-galactosidase. Also, Y187 bearing the above NS1 genes exhibited enhanced beta-galactosidase activity. Nevertheless, H3N2-NS1-transformed AH109 and Y187 yeasts did not grow on QDO plate and secrete beta-galactosidase, respectively. These findings denote the remarkable variation in NS1 proteins from different influenza A virus subtypes on the transcription-stimulating capability in yeast.


Assuntos
Vírus da Influenza A/metabolismo , Ativação Transcricional , Proteínas não Estruturais Virais/metabolismo , Animais , Humanos , Vírus da Influenza A/classificação , Vírus da Influenza A/genética , Técnicas do Sistema de Duplo-Híbrido , Proteínas não Estruturais Virais/genética , Leveduras/genética , Leveduras/metabolismo , alfa-Galactosidase/metabolismo , beta-Galactosidase/metabolismo
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