Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 2 de 2
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
J Pharmacol Exp Ther ; 357(3): 554-61, 2016 06.
Artigo em Inglês | MEDLINE | ID: mdl-27048659

RESUMO

BI 1002494 [(R)-4-{(R)-1-[7-(3,4,5-trimethoxy-phenyl)-[1,6]napthyridin-5-yloxy]-ethyl}pyrrolidin-2-one] is a novel, potent, and selective spleen tyrosine kinase (SYK) inhibitor with sustained plasma exposure after oral administration in rats, which qualifies this molecule as a good in vitro and in vivo tool compound. BI 1002494 exhibits higher potency in inhibiting high-affinity IgE receptor-mediated mast cell and basophil degranulation (IC50 = 115 nM) compared with B-cell receptor-mediated activation of B cells (IC50 = 810 nM). This may be explained by lower kinase potency when the physiologic ligand B-cell linker was used, suggesting that SYK inhibitors may exhibit differential potency depending on the cell type and the respective signal transduction ligand. A 3-fold decrease in potency was observed in rat basophils (IC50 = 323 nM) compared with human basophils, but a similar species potency shift was not observed in B cells. The lower potency in rat basophils was confirmed in both ex vivo inhibition of bronchoconstriction in precision-cut rat lung slices and in reversal of anaphylaxis-driven airway resistance in rats. The different cellular potencies translated into different in vivo efficacy; full efficacy in a rat ovalbumin model (that contains an element of mast cell dependence) was achieved with a trough plasma concentration of 340 nM, whereas full efficacy in a rat collagen-induced arthritis model (that contains an element of B-cell dependence) was achieved with a trough plasma concentration of 1400 nM. Taken together, these data provide a platform from which different estimates of human efficacious exposures can be made according to the relevant cell type for the indication intended to be treated.


Assuntos
Linfócitos B/efeitos dos fármacos , Linfócitos B/enzimologia , Basófilos/efeitos dos fármacos , Basófilos/enzimologia , Naftiridinas/farmacologia , Inibidores de Proteínas Quinases/farmacologia , Pirrolidinas/farmacologia , Pirrolidinonas/farmacologia , Quinase Syk/antagonistas & inibidores , Administração Oral , Animais , Humanos , Masculino , Mastócitos/efeitos dos fármacos , Mastócitos/enzimologia , Naftiridinas/administração & dosagem , Inibidores de Proteínas Quinases/administração & dosagem , Pirrolidinas/administração & dosagem , Pirrolidinonas/administração & dosagem , Ratos
2.
Bioorg Med Chem Lett ; 21(22): 6842-51, 2011 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-21963986

RESUMO

We report a SAR of non-steroidal glucocorticoid mimetics that utilize indoles as A-ring mimetics. Detailed SAR is discussed with a focus on improving PR and MR selectivity, GR agonism, and in vitro dissociation profile. SAR analysis led to compound (R)-33 which showed high PR and MR selectivity, potent agonist activity, and reduced transactivation activity in the MMTV and aromatase assays. The compound is equipotent to prednisolone in the LPS-TNF model of inflammation. In mouse CIA, at 30 mg/kg compound (R)-33 inhibited disease progression with an efficacy similar to the 3 mg/kg dose of prednisolone.


Assuntos
Glucocorticoides/química , Glucocorticoides/farmacologia , Indóis/química , Indóis/farmacologia , Receptores de Glucocorticoides/agonistas , Receptores de Glucocorticoides/metabolismo , Animais , Células HeLa , Humanos , Camundongos , Modelos Moleculares , Relação Estrutura-Atividade
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...