Белок-лигандные взаимодействия CYP51 Candida glabrata и CYP11В1 человека с 7-замещенными производными 19-нортестостеронов

The interaction of human monooxygenases and pathogenic fungi with previously obtained esters of isomeric 7-methyl-19-nor-testosterones and a number of heteroaromatic acids – derivatives of pyridine and pyrazine, was studied. Interaction with the active center of CYP11B1 derivatives of steroids of the androstane series containing methyl group at C7 and residues of heteroaromatic acids at C17β is shown.Изучено взаимодействие монооксигеназ человека и патогенных грибов с полученными ранее сложными эфирами изомерных 7-метил-19-нортестостеронов и ряда гетероароматических кислот – производных пиридина и пиразина. Показано взаимодействие с активным центром CYP11B1 производных стероидов андростанового ряда, содержащих метильную группу при С7 и остатки гетероароматических кислот при С17β

Upconversion Nanoparticles Intercalated in Large Polymer Micelles for Tumor Imaging and Chemo/Photothermal Therapy

Frontiers in theranostics are driving the demand for multifunctional nanoagents. Upconversion nanoparticle (UCNP)-based systems activated by near-infrared (NIR) light deeply penetrating biotissue are a powerful tool for the simultaneous diagnosis and therapy of cancer. The intercalation into large polymer micelles of poly(maleic anhydride-alt-1-octadecene) provided the creation of biocompatible UCNPs. The intrinsic properties of UCNPs (core@shell structure NaYF4:Yb3+/Tm3+@NaYF4) embedded in micelles delivered NIR-to-NIR visualization, photothermal therapy, and high drug capacity. Further surface modification of micelles with a thermosensitive polymer (poly-N-vinylcaprolactam) exhibiting a conformation transition provided gradual drug (doxorubicin) release. In addition, the decoration of UCNP micelles with Ag nanoparticles (Ag NPs) synthesized in situ by silver ion reduction enhanced the cytotoxicity of micelles at cell growth temperature. Cell viability assessment on Sk-Br-3, MDA-MB-231, and WI-26 cell lines confirmed this effect. The efficiency of the prepared UCNP complex was evaluated in vivo by Sk-Br-3 xenograft regression in mice for 25 days after peritumoral injection and photoactivation of the lesions with NIR light. The designed polymer micelles hold promise as a photoactivated theranostic agent with quattro-functionalities (NIR absorption, photothermal effect, Ag NP cytotoxicity, and Dox loading) that provides imaging along with chemo- and photothermal therapy enhanced with Ag NPs