NR ARQN
AU Kagan,B.L.; Azimov,R.; Azimova,R.
TI Amyloid peptide channels
QU Journal of Membrane Biology 2004 Nov; 202(1): 1-10
PT journal article; review; review, tutorial
AB At least 16 distinct clinical syndromes including Alzheimer's disease (AD), Parkinson's disease (PD), rheumatoid arthritis, type II diabetes mellitus (DM), and spongiform encephelopathies (prion diseases), are characterized by the deposition of amorphous, Congo red-staining deposits known as amyloid. These "misfolded" proteins adopt beta-sheet structures and aggregate spontaneously into similar extended fibrils despite their widely divergent primary sequences. Many, if not all, of these peptides are capable of forming ion-permeable channels in vitro and possibly in vivo. Common channel properties include irreversible, spontaneous insertion into membranes, relatively large, heterogeneous single-channel conductances, inhibition of channel formation by Congo red, and blockade of inserted channels by Zn2+. Physiologic effects of amyloid, including Ca2+ dysregulation, membrane depolarization, mitochondrial dysfunction, inhibition of long-term potentiation (LTP), and cytotoxicity, suggest that channel formation in plasma and intracellular membranes may play a key role in the pathophysiology of the amyloidoses.
ZR 80
MH Amyloid/*metabolism; Animals; Humans; *Ion Channel Gating; *Ion Channels; Neurodegenerative Diseases/*metabolism; Prion Diseases/metabolism; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.; Structure-Activity Relationship
AD Department of Psychiatry, Neuropsychiatric Institute, David Geffen School of Medicine, UCLA, Los Angeles, California 90024-1759, USA. bkagan@mednet.ucla.edu
SP englisch
PO USA