Novel application of surface plasmon resonance biosensor chips for measurement of advanced glycation end products in serum of Zucker diabetic fatty rats.
Advanced glycation end products (AGEs) have been implicated in diabetic complications. To measure AGEs, especially N(epsilon)-(carboxymethyl)lysine (CML), in sera from Zucker diabetic fatty rats (ZDF) and Zucker lean rats (ZL), we used a novel method of protein chip and surface plasmon resonance imaging (SPRI). Serum samples were obtained from male ZDF and ZL rats at 20 weeks of age. Antibodies to AGEs or CML were immobilized on a gold surface, which was modified by cysteine-tagged, protein-G constructs. The gold chip upon which the serum was spotted was optically coupled with a prism coupler. The reflected images from the gold chip were obtained using a charge-coupled device (CCD) camera. The direct analysis of the glycated proteins and products using SPRI showed that AGEs and CML levels were elevated in ZDF serum, compared with ZL serum. The lowest detection limit of AGEs was 10 ng/ml, with a working range covering the physiological range. These results indicate that the protein chip and SPRI system is very suitable for the measurement of glycated proteins and end products in serum samples. This system offers high sensitivity without any fluorescent or other labeling of the components and saves a substantial amount of time, resources, and labor. Our results suggest that SPRI systems can be used as a tool to diagnose diabetic complications.
Kim
Young Sook
YS
Diabetic Complications Research Center, Division of Traditional Korean Medicine Integrated Research, Korea Institute of Oriental Medicine, 483 Exporo, Yuseong-gu, Daejeon, 305-811, Republic of Korea.
Yi
So Yeon
SY
Kim
Junghyun
J
Kim
Moonil
M
Kim
Chan-Sik
CS
Chung
Bong Hyun
BH
Kim
Jin Sook
JS
D000818:Animals; D004797:Enzyme-Linked Immunosorbent Assay; D004867:Equipment Design; D017127:Glycation End Products, Advanced / Q000097:blood* / Q000652:urine*; D008239:Lysine / Q000031:analogs & derivatives* / Q000097:blood; D008297:Male; D040081:Protein Array Analysis / Q000295:instrumentation; D051381:Rats; D011924:Rats, Zucker; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance / Q000295:instrumentation / Q000379:methods*
D017127:Glycation End Products, Advanced; C048496:N(6)-carboxymethyllysine; D008239:Lysine