Biodegradable system for drug delivery of hydrolytically labile azanucleoside drugs

0460868 - ÚMCH 2017 RIV CZ eng J - Journal Article
Hrubý, Martin - Agrawal, K. - Policianová, Olivia - Brus, Jiří - Skopal, Jan - Švec, Pavel - Otmar, Miroslav - Dzubak, P. - Štěpánek, Petr - Hajduch, M.
Biodegradable system for drug delivery of hydrolytically labile azanucleoside drugs.
Biomedical Papers. Roč. 160, č. 2 (2016), s. 222-230. ISSN 1213-8118. E-ISSN 1804-7521
R&D Projects: GA MPO(CZ) FR-TI4/625; GA MŠMT(CZ) 7F14009; GA MŠMT(CZ) LO1304; GA ČR(CZ) GA14-03636S
Institutional support: RVO:61389013 ; RVO:61388963
Keywords : 5-azacitidine * 5-aza-2'-deoxycytidine * diclofenac
Subject RIV: EE - Microbiology, Virology; EB - Genetics ; Molecular Biology (UOCHB-X)
Impact factor: 0.894, year: 2016

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. 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. Poly(sebaccic acid-co-1,4-cyclohexanedicarboxylic acid) containing 30 wt. % drug showed zero-order release (R2 = 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. 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.
Permanent Link: http://hdl.handle.net/11104/0261013