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( Thiruganesh Ramasamy ),( Tuan Hiep Tran ),( Ju Yeon Choi ),( Hyuk Jun Cho ),( Jeong Hwan Kim ),( Chul Soon Yong ),( Han Gon Yong ),( Han Gon Choi ),( Jong Oh Kim ) 영남대학교 약품개발연구소 2014 영남대학교 약품개발연구소 연구업적집 Vol.24 No.0
Polyelectrolyte multilayers created via sequential adsorption of complimentary materials may be useful in the delivery of small molecules such as anti-cancer drugs. In this study, layer-by-layer (LbL) nanoarchitectures were prepared by step-wise deposition of naturally derived chitosan and hyaluronic acid on negatively charged hybrid solid lipid nanoparticles (SLNs). A doxorubicin/dextran sulfate complex was incorporated into the SLNs. This resulted in the production of spherical nanoparticles ∼ 265 nm in diameter, with a zeta potential of approximately -12 mV. The nanoparticles were physically stable and exhibited controlled doxorubicin (DOX) release kinetics. Further pharmacokinetic manipulations revealed that in comparison with both free DOX and uncoated DOX-loaded SLNs, LbL-functionalized SLNs remarkably enhanced the circulation half-life and decreased the elimination rate of the drug. Cumulatively, our results suggest that this novel LbL-coated system, with a pH-responsive shell and molecularly targeted entities, has the potential to act as a vehicle to deliver medication to targeted tumor regions.ⓒ2013 Elsevier Ltd. All rights reserved.
( Thiruganesh Ramasamy ),( Ju Yeon Choi ),( Hyuk Jun Cho ),( Subbaih Kandasamy Umadevi ),( Beom Soo Shin ),( Han Gon Choi ),( Chul Soon Yong ),( Jong Oh Kim ) 영남대학교 약품개발연구소 2015 영남대학교 약품개발연구소 연구업적집 Vol.25 No.-
Purpose Irinotecan (IRI) is a broad spectrum chemotherapeutic agent used individually or in combination to treat multiple malignancies. Present study aimed at developing polypeptide-based block ionomer complex (BIC) micelles to improve the pharmacokinetic and antitumor response of IRI. Methods Irinotecan-loaded BIC micelles (IRI-BIC) was prepared and evaluated in terms of various physicochemical and biological parameters including size, shape, release, cytotoxicity, and pharmacokinetic analysis. In vivo antitumor efficacy was investigated in SCC-7 bearing xenograft tumor model. Results IRI was successfully incorporated into the ionic cores of poly(ethylene glycol)-b-poly(aspartic acid) (PEG-b-PAA) with a high drug loading capacity (~80%). The electrostatically assembled BIC micelles were nanosized (~50 nm) with uniform size distribution pattern (PDI~0.1). The BIC micelles exhibited pHsensitiveness with limited release of IRI at physiological conditions and significantly enhanced the release rate at acidic conditions, making it an ideal delivery system for tumor targeting. The IRI-BIC showed a dose-dependent cytotoxicity in SCC-7 and A-549 cancer cell lines. Pharmacokinetic studies clearly showed that BIC micelles improved the IRI blood circulation time and decreased its elimination rate constant, while that of free IRI, rapidly eliminated from the central compartment. Moreover, IRI-BIC showed superior therapeutic performance with no toxicity in BALB/c nude xenograft mice. The micelle treated group showed an inhibition rate of ~66% compared to free IRI treated group. Conclusions Taken together, BIC micelles could be a potentially useful nanovehicle with promising applicability in systemic tumor treatment.
Thiruganesh Ramasamy,Umadevi S Khandasami,Himabindhu Ruttala,Suresh Shanmugam 한국고분자학회 2012 Macromolecular Research Vol.20 No.7
The aim of this study was to formulate and evaluate Ketoconazole-loaded solid lipid nanoparticles (KSLN) for topical application. The purpose of this study was to improve the therapeutic activity of Ketoconazole. KSLN was prepared by a hot homogenization method and characterized for shape, surface morphology, particle size,drug entrapment, cytotoxicity, and rheological analysis. The optimized formulation of solid lipid nanoparticles (SLN) was spherical in shape with a smooth surface and possessed an average size of 172.2±0.75 nm with zeta potential of -44.12±0.76 mV. To guarantee the stability of the desired SLN, they were lyophilized using cryo-protectants. The particle size of the SLN significantly enlarged for formulations which were lyophilized without the cryo-protectants. Cell viability assay performed on National Institute of Health-3-day transfer, inoculum 3×105 cells (NIH-3T3) fibroblast cells showed that properties of the SLN remain unchanged during the process of freeze-drying and were not cytotoxic. An in vitro drug release study showed that KSLN-incorporated hydrogel exhibited a sustained drug release comparing to KSLN dispersion and Ketoconazole loaded hydrogel over a 24 h period. The in vivo studies suggested that the KSLN-incorporated hydrogel was more efficient in the treatment of candidiasis. It may therefore be interpreted that the KSLN-incorporated hydrogel provides a sustained release of Ketoconazole for topical fungal infections and might be a promising delivery system to enhance the therapeutic activity of Ketoconazole.
( Thiruganesh Ramasamy ),( Bijay Kumar Poudel ),( Himabindu Ruttala ),( Ju Yeon Choi ),( Truong Duy Hieu ),( Kandasamy Umadevi ),( Yu Seok Youn ),( Han Gon Choi ),( Chul Soon Yong ),( Jong Oh Kim ) 영남대학교 약품개발연구소 2016 영남대학교 약품개발연구소 연구업적집 Vol.26 No.-
Nanofabrication of polymeric micelles through self-assembly of an ionic block copolymer and oppositely charged small molecules has recently emerged as a promising method of formulating delivery systems. The present study therefore aimed to investigate the interaction of cationic drugs doxorubicin (DOX) and mitoxantrone (MTX) with the anionic block polymer poly(ethylene oxide)-block-poly(acrylic acid) (PEO-b-PAA) and to study the influence of these interactions on the pharmacokinetic stability and anti-tumor potential of the formulated micelles in clinically relevant animal models. To this end, individual DOX and MTX-loaded polyelectrolyte complex micelles (PCM) were prepared, and their physicochemical properties and pH-responsive release profiles were studied, MTX-PCM and DOX-PCM exhibited a differ-ent release profile under all pH conditions tested. MTX-PCM exhibited a monophasic release profile with no initial burst, while DOX-PCM exhibited a biphasic release, DOX-PCM showed a higher cellular uptake than that shown by MTX-PCM in A-549 cancer cells. Furthermore, DOX-PCM induced higher apoptosis of cancer cells than that induced by MTX-PCM, Importantly, both MTX-PCM and DOX-PCM showed pro-longed blood circulation. MTX-PCM improved the AUC<sub>all</sub> of MTX 4-fold compared to a 3-fold increase by DOX-PCM for DOX, While a definite difference in blood circulation was observed between MTX-PCM and DOX-PCM in the pharmacokinetic study, both MTX-PCM and DOX-PCM suppressed tumor growth to the same level as the respective free drugs, indicating the potential of PEGylated polymeric micelles as effective delivery systems. Taken together, our results show that the nature of interactions of cationic drugs with the polyionic copolymer can have a tremendous influence on the biological performance of a delivery system.
( Thiruganesh Ramasamy ),( Jeonghwan Kim ),( Han Gon Choi ),( Chul Soon Yong ),( Jong Oh Kim ) 영남대학교 약품개발연구소 2014 영남대학교 약품개발연구소 연구업적집 Vol.24 No.0
Combination of two or more drugs has emerged as a promising strategy to elicit synergistic therapeutic responses that can overcome multidrug resistance of cancer cells at various stages of the growth cycle. In the current study, we investigated the efficacy of two drugs, mitoxantrone (MTX) and doxorubicin (DOX), co-encapsulated in a polyethylene oxide-b-polyacrylic acid polymer. The resulting block ionomer complex (BIC)-based combination chemotherapy provides a novel method for enhancing the therapeutic efficacy of chemotherapies. The BIC micelles were very stable at physiological pH, and showed a temporally sequenced release profile for the co-encapsulated drugs at tumor pH. This suggests that the micelles can deliver chemotherapeutic agents at the appropriate cellular stage. At a predetermined and carefully controlled ratio (MTX:DOX = 2:1), the two drugs worked synergistically within A549 small lung cancer cells. Taken together, these findings suggest that the synergistic activity of ratiometrically controlled drug combinations can enhance their chemotherapeutic action and overall therapeutic index.