Abstract
Purpose
The present work focuses on the in vivo evaluation of tamoxifen and quercetin combination loaded into solid self-nanoemulsifying drug delivery system (s-Tmx-QT-SNEDDS).
Methods
Lyophilization was employed to prepare s-Tmx-QT-SNEDDS using Aerosil 200 as carrier. The developed formulation was evaluated for in vitro cell cytotoxicity, in vivo pharmacokinetics, antitumor efficacy and toxicity studies.
Results
In vivo pharmacokinetics revealed ~8-fold and ~4-fold increase in oral bioavailability of tamoxifen and quercetin, respectively as compared to free counterparts. s-Tmx-QT-SNEDDS exhibited significantly higher cell cytotoxicity, as compared to free drug combination revealing ~32-fold and ~22-fold higher dose reduction index for tamoxifen and quercetin, respectively estimated using median effect dose analysis. s-Tmx-QT-SNEDDS could suppress tumor growth in DMBA induced tumor bearing animals by ~80% in contrast to ~35% observed with tamoxifen citrate. The significant appreciation in antitumor efficacy was further supported by normalized levels of tumor angiogenesis markers (MMP-2 and MMP-9). Finally, complete obliteration in tamoxifen induced hepatotoxicity was observed upon administration of developed formulation in contrast to that of clinically available tamoxifen citrate when measured as function of hepatotoxicity markers and histopathological changes.
Conclusions
In nutshell, co-encapsulation of quercetin with tamoxifen in solid SNEDDS poses great potential in improving the therapeutic efficacy and safety of tamoxifen.
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Acknowledgments and Disclosures
The authors are thankful to Director, NIPER for providing the necessary infrastructure and facilities and Department of Science & Technology (DST), Government of India, New Delhi, and financial support. A.K.J and K.T. are grateful to Council of Scientific and Industrial Research (CSIR), GoI, New Delhi, for providing research fellowships. Histopathological examination carried out at the Medicos Lab, Chandigarh, India is also duly acknowledged.
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Jain, A.K., Thanki, K. & Jain, S. Solidified Self-Nanoemulsifying Formulation for Oral Delivery of Combinatorial Therapeutic Regimen: Part II In vivo Pharmacokinetics, Antitumor Efficacy and Hepatotoxicity. Pharm Res 31, 946–958 (2014). https://doi.org/10.1007/s11095-013-1214-1
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DOI: https://doi.org/10.1007/s11095-013-1214-1