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Updated: May 7, 2026

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Visualizing S1P-directed cellular egress by intravital imaging.

Christina C Giannouli1, Panagiotis Chandris1, Richard L Proia1

  • 1Genetics of Development and Disease Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.

Biochimica Et Biophysica Acta
|October 5, 2013
PubMed
Summary

Sphingosine-1-phosphate (S1P) signaling regulates the release of immune cells from tissues. Recent imaging techniques clarify the dynamic processes of cell egress into circulation.

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Area of Science:

  • Lipid signaling
  • Immunology
  • Cellular dynamics

Background:

  • Sphingosine-1-phosphate (S1P) is a bioactive lipid mediator.
  • S1P receptors control the movement of immune cells from tissues into the bloodstream.
  • The precise timing and location of these cellular events were previously unclear.

Purpose of the Study:

  • To clarify the role of S1P receptor signaling in immune cell egress.
  • To visualize the dynamic cellular processes involved in cell release into circulation.

Main Methods:

  • Two-photon intravital imaging of living tissues.
  • Analysis of cellular movements and interactions during egress.

Main Results:

  • Recent findings illuminate the spatiotemporal dynamics of S1P-mediated cell egress.
Keywords:
GradientReceptorSignalingSphingolipidSphingosine-1-phosphateTwo-photon microscopy

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  • Visualizations reveal how S1P receptor signaling modulates cell movement into circulation.

    • Conclusions:

    • Two-photon imaging provides unprecedented insight into S1P-regulated cell trafficking.
    • Understanding these mechanisms is crucial for controlling immune cell distribution.