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Research Paper
Bioluminescent Imaging of TRAIL-Induced Apoptosis through Detection of Caspase Activation following Cleavage of DEVD-Aminoluciferin
Jue Judy Liu, Wenge Wang, David T. Dicker and Wafik S. El-Deiry
volume 4 | issue 8
august 2005Pages: 885-892
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Apoptosis, the most common and well-defined form of programmed cell death (PCD), is often impaired in cancer and neurodegenerative diseases and can limit conventional therapy. Bioluminescent molecular imaging was employed to study apoptosis in human colon cancer cells that have been treated with various doses of the therapeutic agent TRAIL (Tumor necrosis factor-Related Apoptosis Inducing Ligand). While monitoring therapeutic response through a proluminescent, caspase-activated DEVD-aminoluciferin reagent (Caspase-Glo 3/7) produced strong, stable signals, alternate preparations of the reagent were explored for noninvasive imaging methods. Dissolving the lyophilized DEVD-aminoluciferin compound in Dulbecco’s PBS instead of lysis buffer (along with heat inactivation of an accompanying exogenous luciferase protein by heating at 85oC for 20 minutes) yielded a minimally invasive apoptosis detector, with maximum luminescence intensities 2.5-fold stronger than those produced by D-luciferin at a final concentration of 100?g/mL. Bioluminescent imaging of cancer therapeutic response through minimally invasive detection of caspase activation may serve as an important tool in monitoring apoptosis in vivo and in vitro.
We now provide open access to journal articles published online for one year or more. This article may be downloaded at the following link:
Download PDFIf the document does not open, please right-click on the link (control-click on a Macintosh) and select the option to save the file to disk.