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Surface plasmon resonance microscopy identifies glycan heterogeneity in pancreatic cancer cells that influences mucin-4 binding interactions

  • 0Biosensing Instrument Inc., Tempe, Arizona, United States of America.
Plos One +

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May 22, 2024

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May 22, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

Altering N-glycans on pancreatic cancer cells significantly impacts Mucin-4 (MUC-4) binding. Removing these glycans revealed new binding populations and dramatically increased binding affinity and speed for anti-MUC-4 interactions.

Area Of Science

  • Biochemistry
  • Glycobiology
  • Cancer Biology

Background

  • Membrane proteins, often glycosylated, are key drug targets.
  • Altered glycosylation is a hallmark of pancreatic cancer, influencing tumor growth.
  • Mucin-4 (MUC-4) is a membrane glycoprotein implicated in pancreatic cancer and metastasis, making it a vaccine target.

Purpose Of The Study

  • To investigate the influence of the native N-glycan environment on MUC-4 binding interactions using Surface Plasmon Resonance Microscopy (SPRM).
  • To quantify binding kinetics and heterogeneity of MUC-4 interactions on single cancer cells without altering their native environment.

Main Methods

  • Surface Plasmon Resonance Microscopy (SPRM) was utilized for label-free, high-resolution analysis of binding kinetics.
  • Enzymatic removal of N-linked glycans using PNGase F was performed on pancreatic cancer cells.
  • Binding interactions of Concanavalin A (Con A), anti-MUC-4, and Helix Pomatia Agglutinin (HPA) were analyzed before and after deglycosylation.

Main Results

  • Deglycosylation revealed three new Concanavalin A (Con A) binding populations with higher affinities.
  • Anti-MUC-4 binding demonstrated a 25x faster association rate and 37x higher affinity after N-glycan removal.
  • Helix Pomatia Agglutinin (HPA) binding showed a shift and increased activity upon removal of N-linked glycans, with four distinct interaction modes observed.

Conclusions

  • N-linked glycans significantly influence MUC-4 binding interactions in pancreatic cancer cells.
  • SPRM provides a unique capability to study these interactions in a native cellular context.
  • Understanding these glycan-MUC-4 interactions is crucial for developing targeted therapies and vaccines for pancreatic cancer.