Solidified Self-Nanoemulsifying Formulation for Oral Delivery of Combinatorial Therapeutic Regimen: Part II In vivo Pharmacokinetics, Antitumor Efficacy and Hepatotoxicity

• Published in: Pharmaceutical research Vol. 31; no. 4; pp. 946 - 958
• Main Authors: Jain, Amit K., Thanki, Kaushik, Jain, Sanyog
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.04.2014; Springer Nature B.V
• Subjects: Administration, Oral; Animals; Antineoplastic Agents - administration & dosage; Antineoplastic Agents - pharmacokinetics; Antineoplastic Agents - toxicity; Antioxidants; Biochemistry; Biomedical and Life Sciences; Biomedical Engineering and Bioengineering; Biomedicine; Breast cancer; Chemistry, Pharmaceutical; Combinatorial Chemistry Techniques - methods; Drug delivery systems; Drug Delivery Systems - methods; Drugs; Emulsifying Agents - administration & dosage; Emulsifying Agents - pharmacokinetics; Emulsifying Agents - toxicity; Female; Humans; Liver - drug effects; Liver - metabolism; Liver - pathology; MCF-7 Cells; Medical Law; Nanoparticles - administration & dosage; Nanoparticles - metabolism; Nanoparticles - toxicity; Pharmaceutical sciences; Pharmacology/Toxicology; Pharmacy; Random Allocation; Rats; Rats, Sprague-Dawley; Research Paper; Tamoxifen - administration & dosage; Tamoxifen - pharmacokinetics; Tamoxifen - toxicity; Toxicity; quercetin; DMBA induced breast tumor; SNEDDS; hepatotoxicity; tamoxifen
• ISSN: 0724-8741; 1573-904X
• DOI: 10.1007/s11095-013-1214-1

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.