Detection and quantitation of beta-2-microglobulin glycosylated end products in human serum by matrix-assisted laser desorption/ionization mass spectrometry.
Anal Chem
; 68(21): 3740-5, 1996 Nov 01.
Article
in En
| MEDLINE
| ID: mdl-8914482
ABSTRACT
beta-2-Microglobulin (beta 2M) is a major protein component found in the amyloid deposits of dialysis-related amyloidosis (DRA) patients. Evidence has been shown that the advanced glycosylated end-products (AGEs) of beta 2M present in sera were related to DRA. We demonstrated that matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is a useful tool to investigate the nature of glycosylation of beta 2M and detection of beta 2M or beta 2M-AGEs in human serum. The high-mass end of beta 2M-AGE distribution was found to extend to the neighborhood of 12,868 Da, corresponding to condensations with seven glucose molecules. We also have shown that both beta 2M and beta 2M-AGEs can be detected at low picomole levels directly in bovine serum. Based on these findings, the sera of DRA patients were studied to determine whether beta 2M-AGEs can be detected by MALDI-MS. In an attempt to investigate the possibility of quantitation with MALDI, human sera samples with different concentrations of beta 2M-AGE were examined. We were able to correlate the concentration of beta 2M-AGE with the number of detected AGE products, pointing to the feasibility of MALDI as a quantitative tool.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Beta 2-Microglobulin
/
Glycation End Products, Advanced
Type of study:
Diagnostic_studies
Limits:
Animals
/
Humans
Language:
En
Journal:
Anal Chem
Year:
1996
Document type:
Article
Affiliation country:
United States