Novel screening test for celiac disease using peptide functionalised gold nanoparticles

Area of Science:

• Nanotechnology
• Biomedical Diagnostics
• Immunology

Background:

• Celiac disease is an autoimmune disorder triggered by gliadin peptides.
• Accurate and accessible diagnostic tools are crucial for managing celiac disease.

Purpose of the Study:

• To develop a novel screening test for celiac disease.
• Utilize gold nanoparticles functionalized with gliadin peptides for assay development.

Main Methods:

• Coating gold nanoparticles with NeutrAvidin and a biotinylated, PEGylated gliadin peptide sequence.
• Developing a serological assay using the peptide-functionalized gold nanoparticles.
• Testing the assay on thirty patient serum samples in a blinded manner.

Main Results:

• A stable, non-aggregating colloidal suspension of peptide-coated gold nanoparticles was achieved.
• The assay detected anti-gliadin antibodies, indicated by a color change and absorbance shift due to nanoparticle aggregation.
• Successful detection of antibodies in spiked samples and a small cohort of celiac disease patients.

Conclusions:

• The gold nanoparticle-peptide based assay shows potential for celiac disease screening.
• This assay could aid in an exclusion-based diagnostic strategy.
• The test is particularly promising for screening high-risk populations.