Profiling Anti-Neu5Gc IgG in Human Sera with a Sialoglycan Microarray Assay

Area of Science:

• Biochemistry
• Immunology
• Glycobiology

Background:

• Cell surfaces feature glycans, including sialic acids (Sia), which are altered in cancer.
• N-glycolylneuraminic acid (Neu5Gc) is a major Sia in mammals, but humans lack endogenous production due to a gene mutation.
• Dietary Neu5Gc from red meat and dairy accumulates on human cells, triggering anti-Neu5Gc antibody responses relevant to cancer and inflammation.

Purpose of the Study:

• To develop a high-throughput sialoglycan microarray assay for assessing anti-Neu5Gc antibodies in human sera.
• To provide a robust tool for investigating immune responses to dietary Neu5Gc antigens.

Main Methods:

• A sialoglycan microarray was created by immobilizing Neu5Gc- and Neu5Ac-containing glycans on epoxy-coated glass slides.
• A nano-printer was used to generate 56 slides in a 16-well format, enabling up to 896 arrays per print.
• Each slide can screen 16 human sera samples to evaluate anti-Neu5Gc antibody specificity, intensity, and diversity.

Main Results:

• The study successfully demonstrates the printing and utility of a high-throughput microarray for sialoglycan analysis.
• The assay allows for the comprehensive evaluation of anti-Neu5Gc antibody profiles in human serum samples.
• The developed protocol is robust and applicable to diverse clinical samples.

Conclusions:

• The high-throughput sialoglycan microarray is an effective tool for studying anti-Neu5Gc antibodies.
• This assay can advance research into the roles of dietary antigens in cancer and chronic inflammatory diseases.
• The technology offers potential for developing new diagnostic and therapeutic strategies targeting Neu5Gc-mediated immune responses.