Journal
JOURNAL OF CELL SCIENCE
Volume 128, Issue 14, Pages 2509-2519Publisher
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/jcs.168773
Keywords
Live-cell imaging; Akt; IGF-I; Signaling pathways; Signaling dynamics
Categories
Funding
- National Institutes of Health (NIH) [DK042748]
- NIH Training Grant [T32 CA106195]
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The protein kinase Akt (for which there are three isoforms) is a key intracellular mediator of many biological processes, yet knowledge of Akt signaling dynamics is limited. Here, we have constructed a fluorescent reporter molecule in a lentiviral delivery system to assess Akt kinase activity at the single cell level. The reporter, a fusion between a modified FoxO1 transcription factor and clover, a green fluorescent protein, rapidly translocates from the nucleus to the cytoplasm in response to Akt stimulation. Because of its long half-life and the intensity of clover fluorescence, the sensor provides a robust readout that can be tracked for days under a range of biological conditions. Using this reporter, we find that stimulation of Akt activity by IGF-I is encoded into stable and reproducible analog responses at the population level, but that single cell signaling outcomes are variable. This reporter, which provides a simple and dynamic measure of Akt activity, should be compatible with many cell types and experimental platforms, and thus opens the door to new insights into how Akt regulates its biological responses.
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