Real-Time Spatiotemporal Measurement of Extracellular Signaling Molecules Using an Aptamer Switch-Conjugated Hydrogel...

Area of Science:

• Biochemistry
• Cell Biology
• Materials Science

Background:

• Cellular communication relies on secreted molecules, but current measurement methods lack chemical specificity and temporal resolution.
• Accurate monitoring of these signaling processes is crucial for understanding development, metabolism, and immunity.

Purpose of the Study:

• To develop a novel aptamer-conjugated hydrogel matrix for continuous, real-time, 2D fluorescent measurement of specific secreted analytes.
• To demonstrate the system's capability by imaging inter-cellular cyclic adenosine 3',5'-monophosphate (cAMP) signals in Dictyostelium discoideum.

Main Methods:

• Engineered aptamer switches exhibiting rapid and reversible fluorescence changes in response to specific analytes like cAMP.
• Integrated multiple aptamer switches with varying dynamic ranges to measure a wide concentration spectrum.
• Embedded the aptamer-hydrogel system within a biocompatible matrix for cell culture and fluorescent microscopy.

Main Results:

• Achieved the first direct measurements of oscillatory cAMP signaling in real-time, correlating with previous indirect findings.
• Successfully measured cAMP concentrations across three orders of magnitude in a single experiment.
• Demonstrated the potential for generalized application to other secreted molecules.

Conclusions:

• The aptamer-hydrogel system provides a powerful new tool for visualizing extracellular signaling in real-time.
• This technology can be adapted to measure diverse secreted molecules, offering insights into cell-cell interactions and biological responses.
• Enables direct visualization of extracellular signaling processes and their triggered biological effects.