Volume 56, Issue 12 pp. 3309-3313
Communication

Steering Siglec–Sialic Acid Interactions on Living Cells using Bioorthogonal Chemistry

Christian Büll

Christian Büll

Department of Radiation Oncology, Radiotherapy & OncoImmunology Laboratory, Radboud University Medical Center, Geert Grooteplein Zuid 32, 6525 GA Nijmegen, The Netherlands

These authors contributed equally to this work.

Search for more papers by this author
Torben Heise

Torben Heise

Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands

These authors contributed equally to this work.

Search for more papers by this author
Niek van Hilten

Niek van Hilten

Computational Discovery and Design Group, Centre for Molecular and Biomolecular Informatics, Radboud University Medical Center, Geert Grooteplein 26–28, 6525 GA Nijmegen, The Netherlands

Search for more papers by this author
Johan F. A. Pijnenborg

Johan F. A. Pijnenborg

Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands

Search for more papers by this author
Victor R. L. J. Bloemendal

Victor R. L. J. Bloemendal

Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands

Search for more papers by this author
Lotte Gerrits

Lotte Gerrits

Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands

Search for more papers by this author
Esther D. Kers-Rebel

Esther D. Kers-Rebel

Department of Radiation Oncology, Radiotherapy & OncoImmunology Laboratory, Radboud University Medical Center, Geert Grooteplein Zuid 32, 6525 GA Nijmegen, The Netherlands

Search for more papers by this author
Dr. Tina Ritschel

Dr. Tina Ritschel

Computational Discovery and Design Group, Centre for Molecular and Biomolecular Informatics, Radboud University Medical Center, Geert Grooteplein 26–28, 6525 GA Nijmegen, The Netherlands

Search for more papers by this author
Dr. Martijn H. den Brok

Dr. Martijn H. den Brok

Department of Radiation Oncology, Radiotherapy & OncoImmunology Laboratory, Radboud University Medical Center, Geert Grooteplein Zuid 32, 6525 GA Nijmegen, The Netherlands

Department of Anesthesiology, Pain and Palliative Medicine, Radboud University Medical Center, Geert Grooteplein 10, 6525 GA Nijmegen, The Netherlands

Search for more papers by this author
Prof. Dr. Gosse J. Adema

Corresponding Author

Prof. Dr. Gosse J. Adema

Department of Radiation Oncology, Radiotherapy & OncoImmunology Laboratory, Radboud University Medical Center, Geert Grooteplein Zuid 32, 6525 GA Nijmegen, The Netherlands

These authors contributed equally to this work.

Search for more papers by this author
Dr. Thomas J. Boltje

Corresponding Author

Dr. Thomas J. Boltje

Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands

These authors contributed equally to this work.

Search for more papers by this author
First published: 14 February 2017
Citations: 43

Graphical Abstract

Clicking the immune system off: We report a method to rapidly reprogram the binding of sialic acid sugars on living cells to their cognate Siglec receptors through glycoengineering and click chemistry. Binding could be improved by more than 100-fold and in a selective manner. The modified cells showed potent immunosuppressive activity resulting from strong signaling through Siglecs on immune cells.

Abstract

Sialic acid sugars that terminate cell-surface glycans form the ligands for the sialic acid binding immunoglobulin-like lectin (Siglec) family, which are immunomodulatory receptors expressed by immune cells. Interactions between sialic acid and Siglecs regulate the immune system, and aberrations contribute to pathologies like autoimmunity and cancer. Sialic acid/Siglec interactions between living cells are difficult to study owing to a lack of specific tools. Here, we report a glycoengineering approach to remodel the sialic acids of living cells and their binding to Siglecs. Using bioorthogonal chemistry, a library of cells with more than sixty different sialic acid modifications was generated that showed dramatically increased binding toward the different Siglec family members. Rational design reduced cross-reactivity and led to the discovery of three selective Siglec-5/14 ligands. Furthermore, glycoengineered cells carrying sialic acid ligands for Siglec-3 dampened the activation of Siglec-3+ monocytic cells through the NF-κB and IRF pathways.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.