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An enzyme immunoassay for advanced glycosylation end-products in serum.

We successfully developed an in-house, competitive enzyme immunoassay to measure advanced glycosylation end-products (AGE) in serum. The assay involved coating microtitre wells with AGE-BSA at 8 micrograms/ml for 4 hours, followed by overnight incubation of 20 microliters sample (prediluted at 1:6) with 80 microliters antiserum (1:8000). HRP-labelled goat anti-rabbit was used as the second antibody and 3,5',5,5'-tetramethylbenzidine dihydrochloride as the substrate. Incubation was carried out at 4 degrees C. As suggested in an earlier study, we standardised the AGE units against normal human serum (NHS). Thus, one AGE unit was defined as the inhibition that resulted when the 1:6 diluted NHS was assayed. Mean (+/- SD) AGE level in normal subjects (n = 37) was significantly lower than in diabetes subjects with microalbuminuria (n = 57) (6.0 +/- 0.7 versus 10.2 +/- 4.7 units/ml, p = 0.0001). With the availability of in-house assay and by standardising the AGE unit with the other laboratories, more studies could be undertaken and results compared, and possibly, further elucidate the roles of AGE in the pathogenesis of diabetic complications.
W Nazaimoon, K Bak

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