Abstract
The zeta-chain-associated protein kinase 70 kDa (ZAP-70), a member of the spleen tyrosine kinase (Syk) family, plays an essential role in early T cell receptor (TCR) signaling. Defects in ZAP-70 lead to impaired thymocyte development and peripheral T cell activation. To better understand its activation dynamics and regulation, we visualized ZAP-70 activities in single live T cells with a Förster resonance energy transfer (FRET)‐based biosensor, which was designed for probing kinase activities of the Syk family. We observed in Jurkat E6.1 T cells rapid and specific FRET changes following anti-CD3 stimulation and subsequent piceatannol inhibition. The initiation of ZAP-70 activation was prompt (within 10 s) and correlates with the accompanied intracellular calcium elevation, as revealed by simultaneous imaging of the biosensor and calcium. Different from the previously reported ZAP-70 activation in the immunological synapse and the opposite pole (anti-synapse), we have observed rapid and sustained ZAP-70 activation only at the synapse with superantigen-pulsed Raji B cells. Furthermore, ZAP-70 signaling was impaired by cholesterol depletion, further supporting the importance of membrane organization in TCR signaling. Together our results provide a direct characterization of the spatiotemporal features of ZAP-70 activity in real time at subcellular levels.
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Acknowledgments
This work was supported by NIH Grant R01AI044902 (to C.Z.), NIH HL098472, HL109142, HL121365 (Y.W.). We thank Dr. Arthur Weiss for kindly sharing the Jurkat P116 cell line expressing kinase-inactive ZAP-70.
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Associate Editor Sriram Neelamegham oversaw the review of this article.
Kaitao Li and Xue Xiang are the co-first authors.
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Li, K., Xiang, X., Sun, J. et al. Imaging Spatiotemporal Activities of ZAP-70 in Live T Cells Using a FRET-Based Biosensor. Ann Biomed Eng 44, 3510–3521 (2016). https://doi.org/10.1007/s10439-016-1683-6
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DOI: https://doi.org/10.1007/s10439-016-1683-6