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2.
Biochem Biophys Res Commun ; 325(3): 683-90, 2004 Dec 17.
Artigo em Inglês | MEDLINE | ID: mdl-15541343

RESUMO

Histone deacetylase (HDAC) inhibitors induce the hyperacetylation of nucleosomal histones in carcinoma cells resulting in the expression of repressed genes that cause growth arrest, terminal differentiation, and/or apoptosis. In vitro selectivity of several novel hydroxamate HDAC inhibitors including succinimide macrocyclic hydroxamates and the non-hydroxamate alpha-ketoamide inhibitors was investigated using isolated enzyme preparations and cellular assays. In vitro selectivity for the HDAC isozymes (HDAC1/2, 3, 4/3, and 6) was not observed for these HDAC inhibitors or the reference HDAC inhibitors, MS-275 and SAHA. In T24 and HCT116 cells these compounds caused the accumulation of acetylated histones H3 and H4; however, the succinimide macrocyclic hydroxamates and the alpha-ketoamides did not cause the accumulation of acetylated alpha-tubulin. These data suggest "selectivity" can be observed at the cellular level with HDAC inhibitors and that the nature of the zinc-chelating moiety is an important determinant of activity against tubulin deacetylase.


Assuntos
Amidas/farmacologia , Neoplasias da Mama/enzimologia , Fibrossarcoma/enzimologia , Inibidores de Histona Desacetilases , Histona Desacetilases/metabolismo , Ácidos Hidroxâmicos/farmacologia , Amidas/química , Neoplasias da Mama/patologia , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Ativação Enzimática/efeitos dos fármacos , Inibidores Enzimáticos , Fibrossarcoma/patologia , Histona Desacetilases/química , Humanos , Ácidos Hidroxâmicos/química
3.
J Enzyme Inhib ; 14(6): 425-35, 1999.
Artigo em Inglês | MEDLINE | ID: mdl-10536876

RESUMO

Two series of compounds synthesized as specific matrix metalloproteinase (MMP) inhibitors have been evaluated for their inhibition of non-MMPs. In a series of substituted succinyl hydroxamic acids, some were found to be significant (IC50 < 1 microM) inhibitors of leucine (microsomal) aminopeptidase, neprilysin (3.4.24.11), and thermolysin. Macrocyclic compounds in which the alpha carbon of the succinyl hydroxamate is linked to the side chain of the P2' amino acid were found to be good inhibitors of aminopeptidase, but not of neprilysin or thermolysin. Compounds of neither series were found to be significant inhibitors of angiotensin converting enzyme or carboxypeptidase A.


Assuntos
Inibidores de Metaloproteinases de Matriz , Metaloendopeptidases/antagonistas & inibidores , Inibidores da Enzima Conversora de Angiotensina , Animais , Proteínas de Bactérias , Carboxipeptidases/antagonistas & inibidores , Carboxipeptidases A , Bovinos , Ácidos Hidroxâmicos/síntese química , Ácidos Hidroxâmicos/metabolismo , Concentração Inibidora 50 , Leucil Aminopeptidase/antagonistas & inibidores , Neprilisina/antagonistas & inibidores , Inibidores de Proteases/síntese química , Inibidores de Proteases/química , Inibidores de Proteases/metabolismo , Coelhos , Ratos , Suínos , Termolisina/antagonistas & inibidores , Zinco/metabolismo
4.
5.
Bioorg Med Chem Lett ; 11(12): 1557-60, 2001 Jun 18.
Artigo em Inglês | MEDLINE | ID: mdl-11412980
6.
Radiol. bras ; 17(3): 200-2, 1984.
Artigo em Português | LILACS | ID: lil-26049

RESUMO

Os autores relatam um caso de leiomiossarcoma gastrico diagnosticado inicialmente como neoplasia hepatica. Discutem o aspecto ultra-sonografico correlacionando com a radiologia convencional


Assuntos
Adulto , Humanos , Masculino , Leiomiossarcoma , Neoplasias Gástricas , Radiografia , Ultrassonografia
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