RESEARCH
【Publication】Fluorescent-labeled anti-inflammatory α-galactosylceramide derivative and its intracellular behavior associated with selective immune function
August 10, 2026
Credits: WPI-Bio2Q
Graphical abstract
Credits: Kikuchi et al., 2026
Co-authored by researchers at Bio2Q and published in Bioorganic & Medicinal Chemistry Letters, this study elucidates the mechanism of selective immune activation using fluorescently labeled anti-inflammatory glycolipids. The researchers developed a method to label anti-inflammatory glycolipids with fluorescence while maintaining their biological activity, allowing them to observe their intracellular dynamics. As a result, they revealed that this compound exhibits a unique transport pattern—being internalized in a CD1d-dependent manner and rapidly presented on the cell surface. These findings demonstrate the role of intracellular trafficking in immune modulation, while highlighting this fluorescent labeling technique as a valuable tool for clarifying therapeutic mechanisms for inflammatory and autoimmune diseases.
| Title | Fluorescent-labeled anti-inflammatory α-galactosylceramide derivative and its intracellular behavior associated with selective immune function |
|---|---|
| Authors | Shunya Kikuchi1, Takanori Matsumaru2, Yukari Fujimoto3 |
| Short Description |
This study, co-authored by researchers from both Bio2Q and Keio University, demonstrates how fluorescently labeling an anti-inflammatory glycolipid can reveal the intracellular mechanisms underlying its selective immune activity.
Glycolipid antigens such as α-galactosylceramide (α-GalCer) regulate immune responses by binding the antigen-presenting molecule CD1d and activating invariant natural killer T (iNKT) cells, but how structurally modified glycolipids produce distinct immune effects has remained unclear. Here, this group of researchers have developed a fluorescence-labeling strategy that preserves the biological activity of α-GalCer-Bz amide, a previously developed anti-inflammatory glycolipid that preferentially induces Th2-type immune responses. Using confocal microscopy and cell-surface antigen tracking, they compared the intracellular behavior of the labeled anti-inflammatory molecule with that of the conventional α-GalCer ligand. While both compounds retained their characteristic cytokine induction profiles, the anti-inflammatory derivative exhibited a distinct trafficking pattern, showing CD1d-dependent cellular uptake and rapid presentation on the cell surface as a CD1d–glycolipid complex. These findings provide new insight into how intracellular trafficking contributes to selective immune modulation and establish fluorescently labeled glycolipids as valuable tools for investigating the mechanisms of immunoregulatory therapeutics targeting autoimmune and inflammatory diseases. |
| DOI | 10.1016/j.bmcl.2026.130617 |
| Journal | Bioorganic & Medicinal Chemistry Letters |
| Vol/Num/Page |
Volume 136:130617.
|
| Publication Date | July, 2026 |
Affiliations
1 Department of Chemistry, Faculty of Science and Technology, Keio University. Yokohama, 223-8522, Japan; Human Biology Microbiome Quantum Research Center (Bio2Q), Keio University. Tokyo, 160-8582, Japan.
2 Department of Chemistry, Faculty of Science and Technology, Keio University. Yokohama, 223-8522, Japan.
3 Department of Chemistry, Faculty of Science and Technology, Keio University. Yokohama, 223-8522, Japan; Human Biology Microbiome Quantum Research Center (Bio2Q), Keio University. Tokyo, 160-8582, Japan.
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