Microfabrication of an asymmetric, multi-layered microdevice for controlled release of orally delivered therapeutics

Lab Chip. 2008 Jul;8(7):1042-7. doi: 10.1039/b800604k. Epub 2008 May 16.

Abstract

The creation of an oral drug delivery platform to administer chemotherapeutic agents effectively can not only increase patient compliance, but also potentially diminish drug toxicity. A microfabricated device offers advantages over conventional drug delivery technology. Here we describe the development of a multi-layered polymeric drug-loaded microfabricated device (microdevice) for the oral delivery of therapeutics, which offers unidirectional release of multiple therapeutics. The imaging and release of therapeutics from the multi-layered device was performed with three different fluorescently labeled albumins. The release of insulin and chemotherapeutic camptothecin was also observed to be released in a controlled manner over the course of 180 min in vitro. Furthermore, asymmetric delivery was shown to concentrate drug at the device/cell interface, wherein 10 times more drug permeated an intestinal epithelial cell monolayer, compared to unprotected drug-loaded hydrogels. The bioactivity of the released chemotherapeutic was shown with cytostasis of colorectal adenocarcinoma cells. Cytostasis of drug loaded hydrogels was significantly higher than control empty hydrogel laden microdevices. Our results conclude that microfabrication of a hydrogel laden microdevice leads to a viable oral delivery platform for chemotherapeutics.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Administration, Oral
  • Animals
  • Antineoplastic Agents / administration & dosage
  • Antineoplastic Agents / metabolism
  • Camptothecin / administration & dosage
  • Camptothecin / metabolism
  • Cattle
  • Cell Line, Tumor
  • Delayed-Action Preparations*
  • Dimethylpolysiloxanes / chemistry
  • Drug Delivery Systems / instrumentation*
  • Drug Delivery Systems / methods*
  • Epithelial Cells / metabolism
  • Fluorescence
  • Humans
  • Methacrylates / chemistry
  • Microfluidic Analytical Techniques / methods*
  • Polyethylene Glycols / chemistry

Substances

  • Antineoplastic Agents
  • Delayed-Action Preparations
  • Dimethylpolysiloxanes
  • Methacrylates
  • poly(ethylene glycol)-dimethacrylate
  • Polyethylene Glycols
  • Camptothecin