Submitted on February 16, 2007
Accepted on May 16, 2007
Unsupervised Fluorescence Lifetime Imaging Microscopy for High-Content and High-Throughput Screening
Alessandro Esposito, Christoph P Dohm, Matthias Bähr, and Fred A Wouters
Cell Biophysics Group, European Neuroscience Institute - Göttingen, Göttingen 37073
Corresponding Author: aesposito{at}quantitative-microscopy.org
Proteomics and Cellomics clearly benefit from the molecular insights in cellular biochemical events that can be obtained by advanced quantitative microscopy techniques like fluorescence lifetime imaging microscopy and Förster resonance energy transfer imaging. The spectroscopic information detected at the molecular level can be combined with cellular morphological estimators, the analysis of cellular localization, and the identification of molecular or cellular sub-populations. This allows the creation of powerful assays to gain a detailed understanding of the molecular mechanisms underlying spatio-temporal cellular responses to chemical and physical stimuli. This work demonstrates that the high content offered by these techniques can be combined with the high-throughput levels offered by automation of a fluorescence lifetime imaging microscope setup, capable of unsupervised operation and image analysis. Systems and software dedicated to Image Cytometry for Analysis and Sorting represent important emerging tools for the field of proteomics, interactomics and cellomics. These techniques could soon become readily available both to academia and the drug screening community by the application of new all-solid-state technologies that may results in cost-effective turnkey systems. Here, the application of this screening technique to the investigation of intracellular ubiquitination levels of -synuclein and its familial mutations that are causative for Parkinsons disease is shown. The finding of statistically lower ubiquitination of the mutant -synuclein forms supports a role for this modification in the mechanism of pathological protein aggregation.