Kim Su-Hyeon, Jung Se-Hui, Kong Deok-Hoon, Jeon Hye-Yoon, Kim Min-Soo, Han Eun-Taek, Park Won Sun, Hong Seok-Ho, Kim Young-Myeong, Ha Kwon-Soo
Department of Molecular and Cellular Biochemistry, Kangwon National University School of Medicine, Chuncheon, Kangwon-Do 200-701, South Korea.
Department of Molecular and Cellular Biochemistry, Kangwon National University School of Medicine, Chuncheon, Kangwon-Do 200-701, South Korea; Department of Anesthesiology, Kangwon National University School of Medicine, Chuncheon, Kangwon-Do 200-701, South Korea.
Clin Biochem. 2016 Jan;49(1-2):127-31. doi: 10.1016/j.clinbiochem.2015.08.025. Epub 2015 Aug 29.
We investigated the effect of cPKAα conformational states during protein immobilization on an array platform for cPKA autoantibody assays for sensitive and high-throughput profiling of protein kinase A (PKA) autoantibody levels in human sera.
We prepared activated human cPKAα protein arrays by addition of cofactors including ATP, MgCl2, and Triton X-100 to incubation buffer. Anti-human cPKAα antibody or PKA autoantibody levels in human sera were analyzed using activated human cPKAα protein arrays.
Activation of cPKAα with ATP, Mg(2+), and Triton X-100 enhanced the sensitivity of the assay by increasing the signal/noise ratio and lowering the limit of detection. cPKAα activation also enhanced the sensitivity of cPKA autoantibody detection in human sera. We successfully applied this assay to determine cPKA autoantibody levels in human sera from normal individuals (n=30) and hepatic cancer patients (n=30).
Our results demonstrate that cPKAα activation enhanced the sensitivity of array-based PKA autoantibody assays, and that this assay is suitable for high-throughput analyses of cPKA autoantibodies in human sera.
