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Updated: Jul 5, 2026

Glycan Node Analysis: A Bottom-up Approach to Glycomics

Glycan Node Analysis: A Bottom-up Approach to Glycomics

Published on: May 22, 2016

Glypicans.

Jorge Filmus¹, Mariana Capurro, Jonathan Rast

¹Department of Medical Biophysics, Division of Molecular and Cellular Biology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario M4N 3M5, Canada. Jorge.filmus@sri.utoronto.ca.

|May 29, 2008

Summary

This summary is machine-generated.

Glypicans, cell surface proteoglycans, regulate key developmental signaling pathways like Wnt and Hedgehog. Their regulatory activity is surprisingly independent of their heparan sulfate chains.

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Area of Science:

Cell Biology
Developmental Biology
Biochemistry

Background:

Glypicans are cell surface heparan sulfate proteoglycans anchored to the plasma membrane.
They are conserved across Eumetazoa, with six family members (GPC1-GPC6) in mammals.
Glypicans can be released by Notum lipase and cleaved by furin-like convertases.

Purpose of the Study:

To summarize the known functions of glypicans in regulating developmental signaling pathways.
To highlight the dual role of glypicans as stimulators or inhibitors of signaling.
To investigate the role of heparan sulfate chains in glypican-mediated signaling regulation.

Main Methods:

Review of in vivo evidence regarding glypican function.
Analysis of glypican interactions with Wnt, Hedgehog, and BMP signaling pathways.
Examination of the contribution of heparan sulfate chains to glypican activity.

Main Results:

Glypicans regulate signaling of Wnts, Hedgehogs, fibroblast growth factors, and BMPs.
Glypicans can either stimulate or inhibit signaling depending on the context.
GPC3 inhibits Hedgehog signaling by competing with Patched for ligand binding.
Glypican regulation of Wnt signaling may involve facilitating Wnt-Frizzled interactions.

Conclusions:

Glypicans play crucial roles in modulating essential developmental signaling pathways.
The regulatory functions of glypicans are not solely dependent on their heparan sulfate chains.
Further research is needed to fully elucidate the mechanisms of glypican-mediated signaling control.