Thursday, November 8, 2007 - 9:20 AM
522c

Biomimetic And Biohybrid Hydrogels: Novel Recognitive Biomaterials For Controlled Therapeutic Delivery

Siddarth Venkatesh, Biomimetic & Biohybrid Materials, Biomedical Devices, and Drug Delivery Laboratories, Department of Chemical Engineering, Auburn University, Auburn, AL 36849-5127 and Mark E. Byrne, Biomimetic & Biohybrid Materials, Biomedical Devices, and Drug Delivery Laboratories, Department of Chemical Engineering, Auburn University, Auburn, AL 36849-5127.

Biomimetic and biohybrid materials are prime candidates for the creation of enhanced delivery systems with tremendous promise to profoundly impact medicine via improved treatment options for disease and better quality of life. Within the field of advanced drug delivery, major emphasis is now being focused toward engineering the architectural design of biomaterials at the molecular level. This presentation will involve a discussion of novel drug delivery materials that we have developed using biology as a guide. Emerging areas of this technology involve thin film drug release platforms.

In the ocular delivery field, we have developed a biomimetic approach in the design and synthesis of novel therapeutic contact lenses to tackle the unmet need for non-invasive, controlled release of drugs to the eye. This technology, which replaces less efficient/effective and less convenient topical eye drops and ointments, creates a new architecture in polymeric films to enable enhanced drug loading and delayed drug release for treatments including eye comfort, allergy, infection, and inflammation. These lenses can be corrective or non-vision altering (i.e., cosmetic or bandage lenses after cataract removal or Lasik surgery) and can release medication under in-vitro physiological conditions at constant rates for extended periods from 24 hours to 20 days depending on formulation. Patients using topical eye drops typically receive large variances in medication from application to application due to insufficient dosages, skipping dosages, and/or over-administering dosages which can lead to ocular damage and side effects. Also, topical solutions and suspensions are typically washed completely from the eye in a short period of time (thus requiring multiple daily applications) and contain preservatives and sensitizers which can cause discomfort and adverse reactions. Controlling and tailoring the release of drugs via novel contact lenses can solve these problems with increased drug bioavailability, less irritation to eye tissue, and reduced eye and systemic side effects. This new class of recognitive intelligent biomaterials is designed by incorporating motifs with structural and molecular homology to biological receptor docking sites and has a strong potential to work with a wide spectrum of drugs and impact the administration of a number of ocular therapies. The US prescription ophthalmic drug market, in which 90% is controlled by the eye drop and ointment sector, is approximately $4.5 billion and growing at a 10% average annual growth rate since 2002.