title: Enhanced bioavailability of exemestane via proliposomes based transdermal delivery.
abstract: Exemestane, a novel steroidal aromatase inactivator used in the treatment of advanced breast cancer has limited bioavailability (42%) due to poor solubility, extensive first-pass metabolism, and also the absorption is dependent on formulation type and food. The present study is aimed to evaluate the feasibility of proliposomes for transdermal delivery of exemestane. The prepared proliposomes were characterized for size, zeta potential, and entrapment efficiency. The size of the vesicles was found to be between 440 and 700 nm with high entrapment efficiency for the formulation containing greater amounts of phosphatidylcholine. Differential scanning calorimetry and Fourier transform infrared studies were performed to understand the phase transition behavior and mechanism for skin permeation, respectively. The drug release across cellophane membrane follows zero-order kinetics by diffusion. Ex vivo permeation enhancement assessed from flux, permeability coefficient, and enhancement ratio were significantly higher for proliposome gels compared with control. A significant improvement in the bioavailability (2.4-fold) was observed from optimized proliposome gel compared with control (oral suspension). The stability data reveal that the formulations are more stable when stored at 4°C. In conclusion, proliposomal gels offer potential and prove to be efficient carriers for improved and sustained transdermal delivery of exemestane.
authors.affiliation: Department of Pharmaceutics, St. Peter's Institute of Pharmaceutical Sciences, Warangal 506001, Andhra Pradesh, India. Electronic address: jukantiraj@gmail.com.
authors.forename: Raju
authors.initials: R
authors.lastname: Jukanti
authors.affiliation: Department of Pharmaceutics, St. Peter's Institute of Pharmaceutical Sciences, Warangal 506001, Andhra Pradesh, India.
authors.forename: Sruthi
authors.initials: S
authors.lastname: Sheela
authors.affiliation: Department of Pharmaceutics, St. Peter's Institute of Pharmaceutical Sciences, Warangal 506001, Andhra Pradesh, India; Dr Reddy's Laboratories, Hyderabad, Andhra Pradesh, India.
authors.forename: Suresh
authors.initials: S
authors.lastname: Bandari
authors.affiliation: Department of Pharmaceutics, St. Peter's Institute of Pharmaceutical Sciences, Warangal 506001, Andhra Pradesh, India.
authors.forename: Prabhakar R
authors.initials: PR
authors.lastname: Veerareddy
mesh_terms: D000279:Administration, Cutaneous; D000730:Androstadienes / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics* / Q000633:toxicity; D000818:Animals; D000970:Antineoplastic Agents / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics* / Q000633:toxicity; D001682:Biological Availability; D002152:Calorimetry, Differential Scanning; D002851:Chromatography, High Pressure Liquid; D004339:Drug Compounding; D004355:Drug Stability; D005782:Gels; D066298:In Vitro Techniques; D008081:Liposomes; D008297:Male; D046529:Microscopy, Electron, Transmission; D010316:Particle Size; D010539:Permeability; D044367:Phase Transition; D051381:Rats; D017208:Rats, Wistar; D012212:Rheology; D012867:Skin / Q000378:metabolism* / Q000648:ultrastructure; D012869:Skin Absorption; D023422:Skin Irritancy Tests; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties
chemical_list: D000730:Androstadienes; D000970:Antineoplastic Agents; D005782:Gels; D008081:Liposomes; C056516:exemestane