New C-19-modified geldanamycin derivatives: synthesis, antitumor activities, and physical properties study.
J Asian Nat Prod Res
; 18(8): 752-64, 2016 Aug.
Article
em En
| MEDLINE
| ID: mdl-26988280
ABSTRACT
Thiazinogeldanamycin (2) was identified from Streptomyces hygroscopicus 17997 at the late stage of the fermentation. The pH was firstly proposed as an important factor in the biosynthesis of it. It was verified that 2 was produced by direct chemical reactions between geldanamycin (1, GDM) and cysteine or aminoethanethiol hydrochloride at pH > 7 in vitro. The proposed synthesis pathway for compound 2 was also discussed. Eleven new C-19-modified GDM derivatives, including five stable hydroquinone form derivatives, were synthesized, most of which exhibited desirable properties such as lower cytotoxicity, increased water solubility, and potent antitumor activity. Especially, compounds 5 and 8 showed antitumor activities against HepG2 cell with IC50 values of 2.97-6.61 µM, lower cytotoxicity and at least 15-fold higher water solubility compared with 1 in pH 7.0 phosphate buffer.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Streptomyces
/
Benzoquinonas
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Lactamas Macrocíclicas
/
Hidroquinonas
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Antineoplásicos
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article