Abstract: The subject invention pertains to an implantable therapeutic device for treating diabetes and methods of making. Upon implantation, the present device secretes insulin in response to blood glucose levels, exquisitely regulates blood glucose levels, reduces hyperglycemia, and includes ?-cell regeneration in the host. It is useful for treating or ameliorating diabetes or diabetic conditions of a subject, including but not limited to, type 1 diabetes mellitus, hyperglycemia, impaired glucose tolerance, insulin deficiency, elevated glucose levels, and insulin resistance.

Abstract: The present invention concerns metal oxide semiconductor nanoparticles with free radical scavenging activity, compositions comprising such nanoparticles, methods for their use, and methods for their production. In one aspect, the invention concerns a method for enhancing the survival or viability of transplanted cells, comprising administering an effective amount of metal oxide semiconductor nanoparticles to a target anatomical site of a subject before, during, or after administration of transplant cells to the subject. Preferably, the metal oxide nanoparticle is a cerium oxide (ceria) nanoparticle.