Lectin-Based Substrate Detection in Fabry Disease Using the Gb3-Binding Lectins StxB and LecA

Area of Science:

• Biochemistry
• Cell Biology
• Genetics

Background:

• Fabry disease is a lysosomal storage disorder caused by alpha-galactosidase A deficiency, leading to glycosphingolipid accumulation and cellular dysfunction.
• Current methods for detecting globotriaosylceramide (Gb3), a key substrate, have limitations in specificity and sensitivity.
• Organelle damage is implicated in substrate accumulation, but underlying mechanisms require further elucidation.

Purpose of the Study:

• To develop and validate a robust lectin-based method for globotriaosylceramide (Gb3) detection in Fabry disease.
• To compare the efficacy of lectins (StxB, LecA) against anti-Gb3 antibodies for Gb3 detection.
• To investigate sphingolipid metabolism in Fabry disease models.

Main Methods:

• Utilized flow cytometry and confocal microscopy for Gb3 detection using Shiga toxin B-subunit (StxB) and LecA lectins.
• Employed targeted tandem liquid chromatography-mass spectrometry to analyze sphingolipid metabolism.
• Studied primary Fabry fibroblasts and alpha-galactosidase A knockout podocytes.

Main Results:

• Lectin-based detection (StxB, LecA) demonstrated superior sensitivity, specificity, and consistency compared to anti-Gb3 antibodies.
• Sphingolipid metabolism alterations were identified in cultured human Fabry disease cells.
• The study established lectins as a reliable tool for Fabry disease research.

Conclusions:

• Lectin-based detection offers an improved diagnostic and research tool for Fabry disease.
• Findings contribute to understanding cellular mechanisms and sphingolipid changes in Fabry disease.
• This work addresses a knowledge gap in Fabry disease diagnostics and molecular pathology.