A synthetic amyloid lawn system for high-throughput analysis of amyloid toxicity and drug screening.
Amyloid-beta (Abeta) is the major constituent of senile plaques in the brains of Alzheimer's disease patients. In order to develop an efficient in vitro system for studying the interaction of cells with Abeta aggregates, we have prepared a synthetic amyloid lawn by immobilizing Abeta peptides over a functionalized glass surface and subsequently incubating the template in a fresh Abeta solution. On the top of different types of amyloid lawns (e.g. monomeric, oligomeric, and fibrillar), we cultivated PC12 cells, creating physical contacts between the cells and the lawns. Results indicated that cell viability was differentially affected when grown atop different Abeta lawns while cells were well adhered onto the surface of these Abeta lawns. The mode of cell death by Abeta lawn was confirmed to be apoptotic rather than necrotic, showing that cells undergo suicide by just contact with Abeta lawn. While conventional 'solution-based' methods for testing amyloid toxicity suffer from problems such as lot-to-lot variations, continued fibrillation, and heterogeneous population of aggregates, our 'surface-based' lawn system is suitable for high-throughput analysis of amyloid toxicity, which may enable high-throughput screening of potential drug candidates for treating amyloid diseases with the goal of reducing the cell death on the lawn.
Girigoswami
Koyeli
K
Institute for the BioCentury and Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.
Ku
Sook Hee
SH
Ryu
Jungki
J
Park
Chan Beum
CB
D016229:Amyloid beta-Peptides / Q000138:chemical synthesis / Q000737:chemistry / Q000633:toxicity*; D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D020169:Caspases / Q000378:metabolism; D002470:Cell Survival / Q000187:drug effects; D004353:Drug Evaluation, Preclinical / Q000379:methods; D018625:Microscopy, Atomic Force; D008856:Microscopy, Fluorescence; D016716:PC12 Cells; D051381:Rats
D016229:Amyloid beta-Peptides; D020169:Caspases