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Reactive immunization suppresses advanced glycation and mitigates diabetic nephropathy
Tatiana Shcheglova1, Sudesh Makker, Alfonso Tramontano
1Department of Pediatrics, University of California, Davis, Medical School, One Shields Avenue, Davis, CA 95616, USA.
Journal of the American Society of Nephrology : JASN
|April 25, 2009
Summary
Immunizing diabetic rats with keyhole limpet hemocyanin (KLH) antibodies reduced harmful glycation end products and kidney damage. This suggests glycoprotein-specific immunization may treat diabetic complications by removing cytotoxic glycation products.
Area of Science:
- Biochemistry
- Immunology
- Pharmacology
Background:
- Diabetes complications are linked to advanced glycation end products (AGEs).
- Reducing the carbonyl load from glycation and glycoxidation is a therapeutic strategy.
- Antibodies to keyhole limpet hemocyanin (KLH) can bind reactive carbonyls on protein conjugates.
Purpose of the Study:
- To assess if antibodies elicited by KLH immunization can intercept carbonyl residues on glycated proteins.
- To determine if KLH immunization mitigates glycation-related pathology in diabetic rats.
Main Methods:
- Streptozotocin-induced diabetic rats were immunized with KLH.
- Levels of glycated peptides, albuminuria, proteinuria, and kidney pathology were measured.
- In vitro studies assessed the reaction kinetics of glycated peptides with anti-KLH antibodies.
Main Results:
- KLH-immunized diabetic rats showed decreased serum glycated peptides.
- Reduction in albuminuria, proteinuria, kidney AGE deposition, and histologic damage was observed.
- Anti-KLH antibodies reacted faster with glycated peptides, modifying specific peptide sequences.
Conclusions:
- Inherent reactivity of Ig light chains may naturally remove cytotoxic glycation products.
- Glycoprotein-specific immunization augments this natural mechanism.
- This approach shows potential as a biopharmaceutical strategy for glycation-related pathology.
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