Cancer detection with sugar molecules

Galectins are a family of proteins that have become a promising source of cancer research in recent years. A representative thereof is galectin-1.

It sits on the surface of all human cells; on tumor cells, however, it occurs in enormous quantities. This makes it an interesting target for diagnostics and therapy.

“Among other things, it is known that galectin-1 hides the tumor cells from the immune system,” explains Professor Jürgen Seibel of the Institute of Organic Chemistry at the Julius-Maximilians-Universität (JMU) Würzburg in Bavaria, Germany.

Recent studies have shown that when Galectin-1 is blocked, the immune system can recognize the tumor and attack it with T cells.

Sugar molecule with docking station

No wonder, therefore, that galectin-1 has become a major focus of research. Seibel and his colleague Dr. Clemens Grimm is interested in a very specific section of this protein, the so-called carbohydrate recognition domain. They have now designed a complex sugar molecule that fits perfectly into this domain, as the scientists report in journal “ChemBioChem”.

“We have equipped the sugar molecule with a docking site, for example, to connect it with a fluorescent dye or an drug,” says Seibel. In addition, the scientists have described the binding of their molecule to galectin-1 with high-resolution X-ray structure analyzes.
“Our findings can serve the development of high-affinity ligands of the protein Galectin-1 and thus of new drugs,” said Clemens Grimm.

Quick test for Galectin-1 in progress

Now the JMU scientists are working on a rapid test for the detection of galectin-1. It is designed to enable early detection of tumors such as neuroblastoma. For the future, Seibel's team would like to expand the sugar molecules into a kind of shuttle system that allows pharmaceutical agents to be transported directly to the tumors.

“Exploring the Structural Space of the Galectin-1–Ligand Interaction”, Nadja Bertleff-Zieschang, Julian Bechold, Clemens Grimm, Michael Reutlinger, Petra Schneider, Gisbert Schneider, Jürgen Seibel, ChemBioChem, 4. August 2017, DOI: 10.1002/cbic.201700251

Contact

Prof. Dr. Jürgen Seibel, Institute of Organic Chemistry, JMU, T +49 931 31-85326, seibel@chemie.uni-wuerzburg.de

Dr. Clemens Grimm, Institute of Organic Chemistry, JMU, T +49 931 31-84031, Clemens.Grimm@biozentrum.uni-wuerzburg.de