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Biodegradable system for drug delivery of hydrolytically labile azanucleoside drugs
M. Hruby, K. Agrawal, O. Policianova, J. Brus, J. Skopal, P. Svec, M. Otmar, P. Dzubak, P. Stepanek, M. Hajduch
Jazyk angličtina Země Česko
Typ dokumentu časopisecké články
NLK
Directory of Open Access Journals
od 2001
Free Medical Journals
od 1998
Medline Complete (EBSCOhost)
od 2007-06-01
ROAD: Directory of Open Access Scholarly Resources
od 2001
PubMed
27003313
DOI
10.5507/bp.2016.013
Knihovny.cz E-zdroje
- MeSH
- azacytidin aplikace a dávkování analogy a deriváty farmakologie MeSH
- implantabilní infuzní pumpy MeSH
- kultivované buňky MeSH
- lidé MeSH
- magnetická rezonanční spektroskopie MeSH
- mikrosféry MeSH
- polymery chemie MeSH
- protinádorové antimetabolity aplikace a dávkování farmakologie MeSH
- vstřebatelné implantáty MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
BACKGROUND: The archetypal DNA methyltransferase inhibitors, 5-azacytidine (AZA) and 5-aza-2'-deoxycytidine (DAC) are potent antineoplastic agents used in the treatment of mainly, blood malignancies. However, the administration of these drugs is confounded by their hydrolytic lability which decreases plasma circulation time. Here, we describe a new biodegradable, polyanhydride formulation for drug delivery that circumvents this drawback. METHODS: Injectable/implantable polymeric microbeads containing dispersed microcrystals of hydrophilic AZA or DAC packed in a dry environment are protected from hydrolysis, until the hydrolytic zone reaches the core. Diclofenac is embedded into the formulation to decrease any local inflammation. The efficacy of the formulations was confirmed by monitoring the induced demethylation, and cytostatic/cytotoxic effects of continuous drug release from the time-course dissolution of the microbeads, using an in vitro developed cell based reporter system. RESULTS: Poly(sebaccic acid-co-1,4-cyclohexanedicarboxylic acid) containing 30 wt. % drug showed zero-order release (R(2) = 0.984 for linear regression), and release rate of 10.0 %/h within the first 5 h, and subsequent slower release of the remaining drug, thus maintaining the level of drugs in the outer environment considerably longer than the typical plasma half-life of free azanucleosides. At lower concentrations, the differences between powder drug formulations and microbeads were very low or negligible, however, at higher concentrations, we discovered equivalent or increasing effects of the drugs loaded in microbeads. CONCLUSIONS: The study provides evidence that microbead formulations of the hydrolytically labile azanucleoside drugs could prevent their chemical decomposition in aqueous solution, and effectively increase plasma circulation time.
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