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Vol. 54, Issue 3, 469-526, September 2002
-Synuclein:
Molecular Pathogenesis and Pharmacological Applications in Alzheimer's
Disease
Department of Pharmacology, College of Medicine, National Creative
Research Initiative Center for Alzheimer's Dementia and Neuroscience
Research Institute, MRC, Seoul National University, Seoul, South Korea
(Y.-H.S.); and Institut de Pharmacologie Moléculaire et
Cellulaire, Valbonne, France (F.C.)
I. Introduction
II. Amyloid Precursor Protein
A. Structure of Amyloid Precursor Protein
B. Trafficking and Proteolytic Processing of Amyloid Precursor
Protein
1.
-Secretase.
2.
-Secretase.
3.
-Secretase.
4. Caspases.
5. Amyloid-Degrading Enzymes.
a. Insulin-Degrading Enzyme.
b. Neprilysin.
c. Plasmin.
d. Endothelin-Converting Enzyme.
e. Other Candidate Proteases.
C. Amyloid Cascade Hypothesis: Two Major Amyloid Precursor Protein
Metabolites Involved in Alzheimer's Disease Pathogenesis
1. Amyloid
-Peptide Hypothesis.
a. Neurotoxic Mechanisms of Amyloid
-Peptide: Free Radical
Accumulation, Altered Calcium Homeostasis, and Inflammatory
Response.
i. Free-Radical Accumulation.
ii. Altered Calcium Homeostasis.
iii. Inflammatory Response.
iv. Activation of Signaling Pathways.
2. C-Terminal Fragment Hypothesis.
a. Neurotoxic Mechanisms of C-Terminal Fragment of
-Amyloid
Precursor Protein.
i. In Vivo Generation of Amyloidogenic Carboxyl-Terminal Fragments
of
-Amyloid Precursor Protein.
ii. Toxicity of Carboxyl-Terminal
Fragments.
b. The Involvement of Carboxyl-Terminal Fragments of Amyloid
Precursor Protein in Gene Transactivation.
D. Amyloid and Tau
E. Transgenic Models of Amyloidogenesis
1. APPswe Transgenic Mice (Tg2576).
2. Amyloid Precursor Protein V717F Transgenic Mice (PDAPP
Mice).
3. APP-751swe/V717I Transgenic Mice.
4. TgAPP23.
5. C100/C104 Transgenic
Mice.
III. Presenilin
A. Preliminary Remarks
B. Cell Biology of Presenilins
C. Presenilins and Their Molecular Partners
D. Physiological and Pathological Roles of Presenilins.
1. Presenilins and the
-Secretase Cleavage of
-Amyloid
Precursor Protein.
2. Presenilins and Notch Signaling.
3. Presenilins and Programmed Cell Death.
4. Presenilins and the Unfolded-Protein Response.
5. Other Putative Functions of Presenilins.
a. Presenilin As a Receptor/Channel.
b. Presenilin in Cell Adhesion.
c. Other Putative Functions.
E. Concluding Remarks on Presenilin Physiology
IV.
-Synuclein
A. Molecular and Cell Biology of
-Synuclein
B. Putative Functions of
-Synuclein in Cell Death
C.
-Synucleinopathies
D.
-Synuclein: A Bridge between Parkinson's and Alzheimer's
Pathologies
V. Therapeutic Targets for Alzheimer's Disease
A. Agents Affecting Secretary Amyloid Precursor Protein-
B. Acetylcholinesterase Inhibitors
1. Tacrine Hydrochloride (Cognex).
2. Donepezil Hydrochloride (Aricept).
3. Galantamine (Reminyl).
4. Rivastigmine Tartrate (Exelon).
C. Agents Inhibiting Aggregation of Amyloid Precursor Protein
Metabolites
1. Metal Chelators.
2.
-Sheet Breakers.
D. Antioxidants
E. Anti-Inflammatory Agents
F. Estrogens
G. Vaccines
H.
-Secretase Inhibitors
I.
-Secretase Inhibitors
1. Peptidic Inhibitors.
2. Nonpeptidic Inhibitors.
a. JLK Inhibitors.
Acknowledgments
References
Alzheimer's disease (AD) is the most common cause of dementia that
arises on a neuropathological background of amyloid plaques containing
-amyloid (A
) derived from amyloid precursor protein (APP) and
-rich neurofibrillary tangles. To date, the cause and progression of
both familial and sporadic AD have not been fully elucidated. The
autosomal-dominant inherited forms of early-onset Alzheimer's disease
are caused by mutations in the genes encoding APP, presenilin-1
(chromosome 14), and presenilin-2 (chromosome 1). APP is processed by
several different proteases such as secretases and/or caspases to yield
A
and carboxyl-terminal fragments, which have been implicated in the
pathogenesis of Alzheimer's disease. Alzheimer's disease and
Parkinson's disease are associated with the cerebral accumulation of
A
and
-synuclein, respectively. Some patients have clinical and
pathological features of both diseases, raising the possibility of
overlapping pathogenic pathways. Recent studies have strongly suggested
the possible pathogenic interactions between A
, presenilins, and/or
-synuclein. Therefore, treatments that block the accumulation of
A
and
-synuclein might benefit a broad spectrum of
neurodegenerative disorders. This review covers the trafficking and
processing of APP, amyloid cascade hypothesis in AD pathogenesis,
physiological and pathological roles of presenilins, molecular
characteristics of
-synuclein, their interactions, and therapeutic
strategies for AD.
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