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Polarized signal transduction from cell surface receptors plays a central role in the development and homeostasis of multicellular organisms, and it also contributes to cellular dysfunction in many disease states. Understanding the molecular and cellular bases of polarized signaling requires experimental methods that provide precise spatiotemporal control of receptor activation. However, we currently lack strategies for inducing both sustained and spatially constrained signal transduction. In the present study, we combined synthetic and cell biological tools to develop a generalizable photoactivation approach for the stimulation of cell surface receptors. Our system, which is based upon the local decaging of a "universal" peptide ligand, is particularly well suited for the live imaging of single cells. We anticipate that it will greatly facilitate future mechanistic analyses of polarized signal transduction in a variety of cell types.

A Generalizable Platform for the Photoactivation of Cell Surface Receptors