Green Fluorescent Protein as a Biosensor for Toxic Compounds

In this brief review, we present recent results in the development of fluorescencebased assays for the detection of compounds with cytotoxic, anticancer and antimicrobial properties. As other reviews have explored various aspects related to these topics, this review will focus on the use of the Green Fluorescent Protein (GFP) for the detection of potentially toxic and/or therapeutic compounds. Since high-throughput screening of chemical compounds can be both expensive and laborious, development of low cost and efficient cell-based assays to determine biological activity should greatly enhance the early screening process. In our recent studies, we have developed a couple of GFP-based assays for the rapid screening of compounds with cytotoxic and bacteriocidal properties. As will be described in more detail in subsequent sections, a new 96-well assay has recently been developed that allows for the simultaneous screening of test compounds on gram positive and negative bacteria as well as mammalian (human cancer) cells. Our results demonstrate that both mammalian cells and bacteria can be analyzed in tandem to rapidly determine which compounds are specifically toxic to one of these cell types. The parallel screening of both eukaryotic and prokaryotic cells was found to be feasible, reproducible, and cost effective.