Acceleration of the depolymerization of amyloid 13 fibrils by ultrasonication

作者：Yagi Hisashi; Hasegawa Kyohei; Yoshimura Yuichi; Goto Yuji^*

来源：Biochimica et Biophysica Acta-Proteins and Proteomics, 2013, 1834(12): 2480-2485.

DOI：10.1016/j.bbapap.2013.08.013

• Amyloid beta
• Amyloid fibril
• Solubility
• Supersaturation
• Ultrasonication

Amyloid fibrils, rigid and filamentous aggregates associated with various diseases, are often difficult to depolymerize into monomers. Ultrasonication is a strong agitation that accelerates nucleation above the critical concentration of amyloid fibrillation. We examined the effects of ultrasonication on the fibrils of amyloid beta(1-40) as well as on monomers. Ultrasonic pulses accelerated spontaneous fibrillation when the peptide concentration was above 1 mu M. On the other hand, ultrasonic pulses accelerated the depolymerization of fibrils into monomers at 1 mu M. These results indicate that, although amyloid fibrillation is a reversible process determined by thermodynamic stability, kinetically trapped supersaturation and physical difficulty of dissolving rigid fibrils prevent the smooth phase transitions. We propose that, in addition to accelerating the nucleation of fibrillation and fragmentation of fibrils above the critical concentration, ultrasonication is useful for dissolving fibrils below the critical concentration.

• 出版日期2013-12