Immunochemical detection of oxalate monoalkylamide, an ascorbate-derived Maillard reaction product in the human lens.
FEBS Lett
; 453(3): 327-30, 1999 Jun 25.
Article
in En
| MEDLINE
| ID: mdl-10405169
ABSTRACT
Carbohydrates with reactive aldehyde and ketone groups can undergo Maillard reactions with proteins to form advanced glycation end products. Oxalate monoalkylamide was identified as one of the advanced glycation end products formed from the Maillard reaction of ascorbate with proteins. In these experiments, we have analyzed human lens proteins immunochemically for the presence of oxalate monoalkylamide. Oxalate monoalkylamide was absent in most of the very young lenses but was present in old and cataractous lenses. The highest levels were found in senile brunescent lenses. Incubation experiments using bovine lens proteins revealed that oxalate monoalkylamide could form from the ascorbate degradation products, 2,3-diketogulonate and L-threose. These data provide the first evidence for oxalate monoalkylamide in vivo and suggest that ascorbate degradation and its binding to proteins are enhanced during lens aging and cataract formation.
Search on Google
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Oxalates
/
Ascorbic Acid
/
Cataract
/
Aging
/
Maillard Reaction
/
Glycation End Products, Advanced
/
Lens, Crystalline
Type of study:
Diagnostic_studies
Limits:
Adolescent
/
Adult
/
Aged
/
Aged80
/
Animals
/
Child
/
Humans
/
Middle aged
Language:
En
Journal:
FEBS Lett
Year:
1999
Document type:
Article
Affiliation country:
United States