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Engineering an antibiotic to fight cancer: optimization of the novobiocin scaffold to produce anti-proliferative agents.

ABSTRACT: Development of the DNA gyrase inhibitor, novobiocin, into a selective Hsp90 inhibitor was accomplished through structural modifications to the amide side chain, coumarin ring, and sugar moiety. These species exhibit ?700-fold improved anti-proliferative activity versus the natural product as evaluated by cellular efficacies against breast, colon, prostate, lung, and other cancer cell lines. Utilization of structure-activity relationships established for three novobiocin synthons produced optimized scaffolds, which manifest midnanomolar activity against a panel of cancer cell lines and serve as lead compounds that manifest their activities through Hsp90 inhibition.

SUBMITTER: Zhao H

PROVIDER: S-EPMC3164572 | biostudies-literature | 2011 Jun

REPOSITORIES: biostudies-literature

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Engineering an antibiotic to fight cancer: optimization of the novobiocin scaffold to produce anti-proliferative agents.

Zhao Huiping H Donnelly Alison C AC Kusuma Bhaskar R BR Brandt Gary E L GE Brown Douglas D Rajewski Roger A RA Vielhauer George G Holzbeierlein Jeffrey J Cohen Mark S MS Blagg Brian S J BS

Journal of medicinal chemistry 20110509 11

Development of the DNA gyrase inhibitor, novobiocin, into a selective Hsp90 inhibitor was accomplished through structural modifications to the amide side chain, coumarin ring, and sugar moiety. These species exhibit ∼700-fold improved anti-proliferative activity versus the natural product as evaluated by cellular efficacies against breast, colon, prostate, lung, and other cancer cell lines. Utilization of structure-activity relationships established for three novobiocin synthons produced optimiz ...[more]

PMID: 21553822

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Project description:Pore size is generally small in nanofibrous scaffolds prepared by electrospinning polymeric solutions. Increase of scaffold thickness leads to decrease in pore size, causing impediment to cell infiltration into the scaffolds during tissue engineering. In contrast, comparatively larger pore size can be realized in microfibrous scaffolds prepared from polymeric solutions at higher concentrations. Further, microfibrous scaffolds are conducive to infiltration of reparative M2 phenotype macrophages during in vivo/in situ tissue engineering. However, rise of mechanical properties of a fibrous scaffold with the increase of polymer concentration may limit the functionality of a scaffold-based, tissue-engineered heart valve. In this study, we developed microfibrous scaffolds from 14%, 16% and 18% (wt/v) polycaprolactone (PCL) polymer solutions prepared with chloroform solvent. Porcine valvular interstitial cells were cultured in the scaffolds for 14 d to investigate the effect of microfibers prepared with different PCL concentrations on the seeded cells. Further, fresh microfibrous scaffolds were implanted subcutaneously in a rat model for two months to investigate the effect of microfibers on infiltrated cells. Cell proliferation, and its morphologies, gene expression and deposition of different extracellular matrix proteins in the in vitro study were characterized. During the in vivo study, we characterized cell infiltration, and myofibroblast and M1/M2 phenotypes expression of the infiltrated cells. Among different PCL concentrations, microfibrous scaffolds from 14% solution were suitable for heart valve tissue engineering for their sufficient pore size and low but adequate tensile properties, which promoted cell adhesion to and proliferation in the scaffolds, and effective gene expression and extracellular matrix deposition by the cells in vitro. They also encouraged the cells in vivo for their infiltration and effective gene expression, including M2 phenotype expression.

Dataset Information

Engineering an antibiotic to fight cancer: optimization of the novobiocin scaffold to produce anti-proliferative agents.

Publications

Engineering an antibiotic to fight cancer: optimization of the novobiocin scaffold to produce anti-proliferative agents.

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