Oxidative Stress and Cell Membranes in the Pathogenesis of

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PHYSIOLOGY 26: 54 – 69, 2011; doi:10.1152/physiol.00024.2010
Oxidative Stress and Cell Membranes in
the Pathogenesis of Alzheimer’s Disease
Amyloid ␤ proteins and oxidative stress are believed to have central roles in
the development of Alzheimer’s disease. Lipid membranes are among the
Paul H. Axelsen,1,2 Hiroaki Komatsu,1
and Ian V. J. Murray3
Departments of 1Pharmacology, 2Biochemistry and Biophysics,
and Medicine, University of Pennsylvania School of Medicine,
Philadelphia, Pennsylvania; and 3Department of Neuroscience
and Experimental Therapeutics, Texas A&M Health Science
Center, College Station, Texas
most vulnerable cellular components to oxidative stress, and membranes in
susceptible regions of the brain are compositionally distinct from those in
other tissues. This review considers the evidence that membranes are either a
source of neurotoxic lipid oxidation products or the target of pathogenic
processes involving amyloid ␤ proteins that cause permeability changes or ion
disease pathogenesis is discussed in which lipid membranes assume both
roles and promote the conversion of monomeric amyloid ␤ proteins into
fibrils, the pathognomonic histopathological lesion of the disease.
The literature of Alzheimer’s disease (AD) research
is vast, complex, and often contradictory. Nevertheless, a broad perspective on this literature, and
on what typically does and does not happen in
biological systems, suggests either that lipid membrane damage is directly involved in the pathogenesis of AD or that it is an important consequence of
AD. Therefore, investigations into the relationship
between membrane damage and amyloidogenesis
may yield important insights into AD pathogenesis.
The “amyloid hypothesis” has driven much of
the research on AD pathogenesis since it was proposed in 1991 (123, 124). In its simplest form, this
hypothesis suggests that the accumulation of amyloid beta (A␤) proteins in brain tissue drives the
pathogenesis of AD. A␤ proteins originate from a
large transmembrane protein of unknown function
known as amyloid precursor protein (APP) by the
action of ␤-secretase and ␥-secretase activity
(FIGURE 1). The specific cleavage site of ␥-secretase is somewhat variable, yielding proteins ranging from 39 to 43 residues in length, with 40 and 42
residue forms predominating (A␤40 and A␤42).
The non-amyloidogenic pathway for APP processing involves ␣-secretases, a family of enzymes that
cleave APP near the middle of the A␤ protein
segment.
The amyloid hypothesis was initially based on
genetic studies of familial AD and the occurrence
of AD-like pathology in Down Syndrome. Among
the most cited experimental studies in support of
this hypothesis are those in which A␤ proteins
impair physiological and cognitive function when
injected into rodent brains (72, 136, 184, 282, 320,
336). Nevertheless, the amyloid hypothesis has
been criticized for being incomplete and vague.
54
For example, it is unable to explain nonfamilial or
sporadic cases of AD (the most prevalent form),
how fibril formation leads to neuronal death, the
poor clinicopathological correlation between amyloid plaque burden and cognitive impairment
(279), the hyperphosphorylation and aggregation
of tau proteins as neurofibrillary tangles, and axonopathies that precede amyloid deposition (302).
These criticisms notwithstanding, there are no alternative hypotheses with nearly as much support,
and the amyloid hypothesis is readily adapted to
answer some of these criticisms. For example, the
pathologies that precede amyloid deposition may
be due to prefibrillar intermediate forms of A␤
protein, and plaques may represent an inert form
of the protein (62, 125, 337). Supporting this idea is
the observation that a variant form of A␤ that oligomerizes but does not fibrillize can nonetheless
cause several pathological manifestations of AD
other than fibril formation (318).
It has been suggested that there is a tenuous
balance among the rates of A␤ protein production,
aggregation, and elimination in brain tissue, such
that a small disturbance applied over sufficient
time causes the pathological accumulation of A␤
protein as amyloid fibrils in AD. However, the concentrations of A␤ proteins in the brain appear to be
far lower than their aqueous in vitro solubility (143,
238, 281). Therefore, A␤ proteins should not form
amyloid fibrils in the brain even if concentrations
are modestly elevated. Yet, fibrils do form with
advancing age in virtually everyone, indicating that
factors other than A␤ protein concentration must
have a role in causing them to form. If small
changes in protein concentration cannot account
for fibril formation, then we must consider factors
1548-9213/11 ©2011 Int. Union Physiol. Sci./Am. Physiol. Soc.
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channel formation. Progress toward a comprehensive theory of Alzheimer’s
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such as macromolecular crowding (216, 228),
locally high concentrations of A␤ proteins at synapses (71), chemical modification (30, 161, 231,
287, 360), cross-linking (17, 22, 290, 291), or metal
complex formation (6, 31, 92, 105, 153, 272, 284,
306). Understanding the chemical mechanisms
that reduce the solubility of A␤ proteins in brain
tissue is key to understanding why AD pathology
develops in some individuals and not others.
Oxidative Stress
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Oxidative stress is caused by a dense, complex and
heterogeneous network of oxidizing reactions running
counter to the reducing conditions that otherwise prevail in cells and tissues. It has been suggested that the
accumulation of A␤ proteins in the brain may be a
protective response to oxidative stress (16, 28, 162, 164,
273, 292). The density of plaques containing A␤ protein
correlates inversely with markers of oxidative damage
(75), and the cortical deposition of A␤ proteins
correlates with reduced oxidative damage in
Down syndrome (236). Moreover, A␤ proteins prevent lipoprotein oxidation (163) and metal-induced
neuronal death in culture (363). However, it is inherently difficult to quantify oxidative stress, and attempts
to do this are subject to many methodological pitfalls.
For example, a study concluding that the primary
mechanism of A␤ toxicity does not involve oxidative
pathways measured thiobarbituric acid reactive substances (TBARS) to assess lipid peroxidation (248).
However, assays for TBARS measure only a small subset of the diverse oxidation products generated, as well
as substances not derived from lipids. Other studies
suggesting that A␤ has antioxidant activity were not
controlled for the inherent redox activity of peptide
groups or conducted in the presence of biologically
relevant electron donors and acceptors to drive the
reactions (23, 24).
Overall, it seems more likely that A␤ proteins
promote oxidative stress (42, 50, 91, 201, 202, 254).
The brain in AD appears to sustain more oxidative
damage than normal brain (200, 211, 331), exhibits
an increased susceptibility to oxidative stress (190,
220, 277), and has relatively low levels of naturally
occurring antioxidants such as ␣-tocopherol (144,
358). Regions of the brain rich in A␤ proteins also
have increased levels of protein oxidation (129).
The overexpression of A␤ proteins in transgenic
mice, in C. elegans, and in cell culture, increases
biomarkers of oxidative stress (256, 345). A␤ proteins cause H2O2 and lipid peroxides to accumulate in cells (27). Catalase protects cells from A␤
toxicity, and cell lines selected for resistance to A␤
toxicity also become resistant to the cytotoxic action of H2O2. A␤ proteins promote the oxidation of
compounds such as dopamine, phospholipids, and
cholesterol (40, 134, 135, 235, 241, 257, 356) as long
as an intact methionine side chain is present (5, 21,
45, 47, 49, 232).
A␤ proteins and amyloid plaques bind redoxactive transition metals that are likely to be the
actual site of redox activity (76, 273). Copper levels
are significantly increased in amyloid plaques (183,
191, 304), although comparatively subtle increases
in copper transport across cell membranes may
cause significant changes in A␤ protein turnover
(321). Excess dietary copper increases AD-like pathology in a mouse model (160). Cu2⫹ and Zn2⫹
chelators appear to inhibit A␤ deposition in the
brains of mouse models (64), and metal depletion
promotes the disaggregation of A␤ fibrils (65).
Cu2⫹ potentiates the neurotoxicity of A␤42 ⬎ A␤40
in embryonic rodent neurons, and its effect is mediated by H2O2 (135, 355). Studies of copper in the
pathogenesis of AD have been extensively reviewed
(39, 90, 100, 305). In contrast, Zn2⫹ ions are redoxinert and able to protect/rescue human cells in
tissue culture from A␤ and Cu2⫹ toxicity (75). A
recent study, however, observed that the zinc released at synapses with neurotransmitters caused
the accumulation of toxic A␤ oligomers to these
membranes (86).
It has been suggested that A␤ proteins split into
fragments that are both neurotoxic and able to
generate additional oxygen radicals (48, 128), although these findings have been strongly refuted
(89). Nevertheless, electron paramagnetic resonance spectroscopy has shown that there is a
strong correlation between the intensity of radical
generation by A␤ and neurotoxicity (219). In these
studies, preincubation of A␤ to form fibrils increased its toxicity. In contrast, replacing the redox-active sulfur atom in residue Met35 with
methylene (CH2) resulted in a peptide that formed
fibrillar structures but had no demonstrable toxicity toward cultured hippocampal neurons. In the
same experimental system, vitamin E (presumably
acting as an antioxidant) neutralized the neurotoxicity of A␤ but had no effect on its ability to form
FIGURE 1. Processing of the amyloid precursor protein
A␤ proteins are 39- to 43-residue segments within the 770-residue amyloid precursor
protein (APP), beginning at residue 672. The non-amyloidogenic processing pathway is
catalyzed by ␣-secretase, which cleaves in the midst of the A␤ protein segment. The
amyloidogenic pathway is catalyzed by ␤-secretase, which cleaves an extracellular site of
APP, and ␥-secretase, which cleaves at points within the transmembrane segment.
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Enter Lipid Membranes
Investigations into the role of lipids in AD are experimentally challenging because they are chemically diverse, with thousands of distinct molecular
species present in every cell. They are also physically diverse, rarely existing as monomeric species
in solution unless protein bound. In vitro, the vast
majority form micelles or vesicles, and the latter
may be unilamellar or multilamellar. Thus lipid
suspensions generally have two or more phases
and complex interphase equilibria. This physical
heterogeneity complicates most types of physicochemical analysis, even when pure synthetic lipid
preparations are used, and it makes some others
outright impossible. It also impedes the measurement of fibril formation. Turbidity measurements,
for example, are confounded by ambiguity over
whether the species causing the turbidity is protein
or lipid. Lipids markedly increase the fluorescence
of the thioflavin T apart from fibril formation,
whereas assays based on Congo Red absorbance
ratios entail practical restrictions on protein and
lipid concentrations that limit the flexibility of this
assay. The presence of membranes can also complicate sample preparation, and they yield artifacts
when the halogenated solvents used to disaggregate A␤ proteins are not completely removed (56,
310).
Due in part to these challenges, the evidence
that cell membranes are involved in the pathogenesis of AD remains largely circumstantial, even
though the amount of evidence pointing to some
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PHYSIOLOGY • Volume 26 • February 2011 • www.physiologyonline.org
type of link is overwhelming. A␤ proteins are produced by cleavage of APP at two sites, one site
being located approximately at the midpoint of the
transmembrane segment (FIGURE 1). As a consequence, the COOH-terminal residues of A␤ proteins that were part of the APP transmembrane
segment are uniformly hydrophobic. Following
their cleavage from APP, some investigators have
observed that A␤ proteins remain associated with
detergent-resistant lipid membrane domains in
the brain (181), or with membrane-anchored APP
(189). It has also been hypothesized that A␤ proteins bind to the transmembrane helices of membrane proteins and cause their dysfunction (199).
Ultrastructural studies suggest that amyloid fibril
formation tends to occur first in portions of diffuse
amyloid deposits that are closest to membranes
(234, 319, 346). A␤40 with the E22Q mutation (responsible for hereditary cerebral hemorrhage with
amyloidosis-Dutch type) will fibrillize on the surface membrane of human cerebrovascular smooth
muscle cells (330).
Despite a substantial hydrophobic segment, the
general conclusion reached by most investigators
is that A␤ proteins have little affinity for neutral
lipid membranes (205). Techniques such as the
hydration of a mixed protein-lipid film must be
used to induce the penetration of A␤ proteins into
a neutral lipid bilayer (83). One laboratory investigating A␤40 and another investigating A␤42 have
documented that the proteins situate differently in
membranes depending on whether they are embedded in a bilayer membrane or allowed to associate with the surface of a preformed membrane
(33, 106, 176). In general, anionic lipids tend to
induce A␤ proteins to adopt extended ␤ structure
(35, 63, 66, 76, 130, 167–169, 204, 213, 214, 313, 314,
344, 352). Possible reasons for the inducement of ␤
structure and fibril formation by protein-lipid interaction have been reviewed, including the ability
of such interactions to serve as templates for structural change, to increase the local concentration of
protein, and to orient protein monomers relative to
each other (2, 113). A␤ proteins adopt ␣-helical
structure in association with lipid membranes at
low lipid-to-protein ratios (315), at high cholesterol
concentrations (145), or in conjunction with metal
ions (21, 76, 77). Some investigators have found that
detergent micelles promote ␣-helical structure (283),
whereas others find that it promotes the formation of
oligomers with ␤ structure (261). Spontaneous insertion into various membranes has been observed for
A␤ segments (82) and for A␤ proteins at relatively low
membrane surface pressures (94).
The relative abundance of various lipid classes in
membranes is altered in AD (121, 227, 247, 252,
350), and altering membrane composition protects
PC12 cells from toxic effects of A␤ proteins (338).
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fibrils (332). Another study concluding that free
radicals do not mediate A␤-induced neurotoxicity
used ginkgolides (a purported anti-oxidant component of Ginkgo biloba leaves) and vitamin E to
inhibit oxidation (351). Although neither agent
protected cells from apoptosis and death, it is unlikely that they completely halted radical-mediated
oxidative damage.
Proteomics studies of oxidative stress have focused on proteins damaged by oxidation, nitration,
and other reactive substances (41, 44, 50, 51, 57, 58,
60, 80, 107, 243, 285, 293, 317). In most cases,
reactions with protein carbonyl groups are taken
for evidence of damage by oxidation, and the nature of the protein modification is not explicitly
defined. Two studies have examined the ability of
A␤ proteins to induce oxidative modifications in
other proteins (34), and A␤ proteins may also undergo oxidative damage, particularly His, Tyr, and
Met side chains (15, 32, 43, 132, 139). However, it is
difficult to imagine how oxidative damage to proteins, especially A␤ proteins, would lower the
aqueous solubility of A␤ proteins and promote fibril formation.
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with lovastatin/mevalonate alone, however, was insufficient to induce a significant effect; treatment
with ␤-cyclodextrin to achieve a 70% reduction of
cellular cholesterol content was also required. It has
been suggested that the dependence of A␤ protein
production on cholesterol is due to the selective activity of ␤-secretase activity in cholesterol-dependent
raft-like subdomains of the plasma membrane,
whereas ␣-secretase activity appears to predominate
in non-raft domains (95). Some ␤-secretase stimulation has also been attributed to neutral glycosphingolipids and anionic phospholipids (152). The
efficacy of a ␤-secretase inhibitor has been increased
by linking it to cholesterol and thereby targeting it to
membranes (260).
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Altered physical properties, presumably arising
from compositional differences, have been observed in hippocampal membranes of AD brains
(364). Plasmalogen deficiency is frequently associated with AD (102, 110 –112, 119, 120, 229). In addition to having an effect on membrane physical
properties, plasmalogens are particularly susceptible to oxidative damage (156 –158). This susceptibility may confer on plasmalogens the ability to
protect other lipid species by diverting and trapping oxidizing agents (36, 117, 118, 170, 195, 196,
222, 230, 242, 264, 362). Cerebral white matter is
enriched in plasmalogens for unknown reasons
(101).
Human epidemiological studies support a link
between AD and the consumption of ␻-3 polyunsaturated fatty acyl (PUFA) chains (103, 141, 223,
224, 237, 250, 275, 323), and this association is
supported by animal model and cell culture studies (53–55, 126, 146, 185, 193, 350). The most prevalent ␻-3 PUFA in the brain is docosahexaenoic
acid (DHA), and dietary DHA supplementation alleviates both AD-like histopathology and cognitive
impairment in animal models (53, 55, 126, 185).
The metabolism of DHA in normal brain is remarkable in several respects (159), and it is difficult to
induce a measurable deficiency of DHA-containing
lipids in the brain tissue of animal models through
dietary restriction (84). Animal studies have shown
that the brain responds to a dietary deficiency of
DHA by elongating arachidonic acid (ARA) chains.
Because there are no enzymes capable of desaturating the distal end of these PUFA chains, the
result is a marked increase in docosapentaenoic
acid (DPA) chains (138).
A␤ proteins appear to have special relationships
or interactions with specific lipid species. For example, the ganglioside GM1 is bound together with
A␤ proteins in diffuse amyloid plaques (348). GM1containing membranes promote the formation of
␣ structure (212, 215), ␤ structure (206), or fibrils in
vitro (67– 69, 115, 127, 148 –151, 165, 207, 218, 239,
240, 334, 335). In several of these reports, GM1 is
presented in raft-like membrane subdomains in
which cholesterol is a significant component, and
rafts have also been discussed as an influence on
the processing of APP into A␤ proteins (74). Apart
from rafts, cholesterol has been epidemiologically
(289, 311) and experimentally (263, 300) linked to
the incidence of AD, and it may influence the production (108, 361), location (77, 87, 145), behavior
(79, 214, 352), or toxicity (38, 78, 137, 308, 338) of
A␤ proteins. In models of Niemann-Pick Type C
disease, A␤ proteins accumulate along with cholesterol (347).
Cholesterol depletion reduced the ␤-cleavage of
APP and the production of A␤ proteins in a study of
neurons in the rat hippocampus (288). Treatment
The Membrane as Villain
The lipids in cell membranes are often regarded as
being chemically unreactive and merely a physical
barrier or a support matrix for proteins. That view
is misleading on many levels, of course, but particularly so when the membrane lipids contain
PUFA chains and are subjected to oxidative stress.
Reviews of the role of membranes in AD pathogenesis frequently overlook the effects of oxidative
stress and chemical modification of PUFA chains
on membrane properties. A␤ proteins have a
prooxidant activity toward polyunsaturated lipids
that can be neutralized by lipophilic antioxidants,
chelation of metal ions, anaerobic conditions, mutation of His13 or His14 to Ala, or modification of
the Met35 side chain (232). Lipid oxidation products and the susceptibility of lipids to oxidative
damage are both increased in AD (78, 104, 210,
309). Several reports have outlined the potential for
a complex interplay between cholesterol oxidation
products and A␤ proteins (38, 116, 235, 241, 301,
329, 356, 360).
The myriad mechanisms of oxidative stress yield
diverse chemically reactive products from PUFA
chains including hydroxy- and hydroperoxy-lipids
that undergo spontaneous decomposition, lipid
free radicals that may participate in free-radical
chain reactions, as well as fragments such as malondialdehyde, acrolein, and hydroxynonenal with
the potential to form adducts with proteins and
nucleic acids (61, 270, 274, 293, 295, 296). These
materials are direct toxic threats to the tissues in
which they are generated. Brain is the most lipidrich organ in the body, and it contains more lipids
bearing PUFA chains than any other organ. Therefore, brain tissue is at particularly high risk for
chemical injury due to highly reactive lipid oxidation products.
Evidence that lipid peroxidation may be involved
in the pathogenesis of AD has been extensively
reviewed (13, 42, 46, 201). Lipid hydroperoxides
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PHYSIOLOGY • Volume 26 • February 2011 • www.physiologyonline.org
ble for generating HNE from ␻-6 PUFAs. Consequently, HNE-His epitopes would develop around
preexisting amyloid plaques, not within them. A
second possibility is that A␤-specific antibody
epitopes are masked by HNE modification, as observed in vitro for 4G8 and 6E10 epitopes (231). A
third possibility is that A␤ fibrils induced to form
by HNE modification have relatively sparse HNEHis epitopes (as suggested by FIGURE 2), yielding
sparse fluorescence among fibrils. The fluorescence of HNE-11S seen in FIGURE 3 may be to
HNE produced in the plaque but bound to HNEHis adducts in proteins other than A␤ proteins.
Some investigators have focused on the role of
acrolein in the pathogenesis of AD. Acrolein is a well
known environmental toxin and a recently recognized product of lipid peroxidation (324, 326, 327). It
reacts spontaneously with Lys residue side chains,
forming a cyclic Nε-(3-formyl-3,4-dehydropiperidino) derivative that has been considered a
biomarker for measuring oxidative stress in AD
(52). Acrolein is elevated in AD brain, it appears
to be more neurotoxic than HNE, it causes elevated intracellular calcium levels (192, 342), and
it appears to inactivate flippase, inducing a
breakdown of lipid membrane asymmetry and
apoptosis (1, 59).
The Membrane as Victim
Although the foregoing discussion suggests that AD
may be caused by membrane-derived neurotoxic
agents, a contrasting view is that AD is due to
FIGURE 2. Electron micrograph of fibrils induced
by HNE modification
A␤42 was induced to fibrillize with HNE, then treated
with mouse anti-His-HNE, and gold-tagged anti-mouse
antibody. The focus in this image is on the gold particles, but various fibril morphologies are evident, and the
gold particles making anti-HNE-His antibodies are preferentially associated with long, relatively straight fibils.
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undergo spontaneous (nonenzymatic) decomposition, and ␻-6 PUFA chains yield reactive ␣,␤-unsaturated aldehydes such as 4-oxo-2(E)-nonenal
(180) and 4-hydroxy-2(E)-nonenal (HNE) (97, 98),
as well as eicosanoids such as isoprostanes (225,
226). The prooxidant activity of A␤ proteins mentioned above can catalyze the formation of HNE
from ␻-6 PUFAs in the presence of copper ions
(232). Isoprostanes are relatively unreactive compounds that have been used as biomarkers of oxidative stress (179, 221, 244, 268). Some reports
suggest that isoprostanes are specifically elevated
in AD (253, 255, 256), although these findings have
not been confirmed by all investigators (221, 357).
Analogous products derived from ␻-3 PUFA chains
have been dubbed “neuroprostanes” and also have
been put forward as indexes of oxidative stress in
the brain (14, 266, 267, 298).
Compared with isoprostanes, HNE is chemically
reactive, with a well known propensity to form
adducts with the side chains of various amino acid
residues (37, 98, 328). For this reason, HNE-protein
adducts have also been used as biomarkers of oxidative stress (325). HNE concentrations in human
ventricular fluid are ⬃15 ␮M and are elevated in
AD (190, 203, 210). HNE modification is also known
to inhibit proteasome function (286) and glutamate transport in synaptosomes (177). Together
with the observation that immunoreactivity of antibodies to HNE-modified His residues localizes to
amyloid plaques (7, 294), these observations suggest that A␤ proteins not only promote lipid oxidation but that there may also be a mechanistic
link between the lipid oxidation products formed
during oxidative stress and A␤ misfolding (161).
A␤ proteins increase HNE production from PUFA
chains in vitro that, in turn, causes covalent modification of the three His residues in A␤ proteins and
fibril formation (231). These modifications promote
the aggregation of A␤ proteins into fibrils (FIGURE 2)
(165, 231, 232). Moreover, they increase the ability of
A␤42 to seed fibril formation by unmodified A␤40
(166). The effects of HNE on A␤ fibril formation depend on the size or hydrophobicity of the modification because the corresponding analog from ␻-3
PUFA chains, 4-hydroxy-2(E)-hexenal, does not have
this effect (187). The addition of an octanoyl group to
specific Lys residues of A␤ proteins also appears to
have a pro-amyloidogenic effect (258).
In vivo, HNE-His epitopes are concentrated in
the vicinity of amyloid plaques, but they do not
precisely co-localize with the plaques (FIGURE 3).
One possible explanation for this distribution is
that the presence of HNE-His adducts and Cu-His
complexes in the same protein molecule are mutually exclusive. Presumably, the formation of CuHis complexes precedes the generation of HNE
and HNE-His adducts, if indeed they are responsi-
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toxic properties of A␤ proteins on a membrane depends on the extent to which it has aggregated into
oligomers and that this extent is concentration dependent (276). Model structures of the purported
channels have been patterned after ␤-barrel poreforming toxins (8, 93). This comparison is suggested
not only by the EM/AFM images but by the reactivity
of A␤ and ␣-hemolysin with so-called “conformation-specific” antibodies (354). Recent studies confirming the formation of zinc-sensitive ion channels
have also exposed the potential for artifact due to
residual amounts of halogenated solvent in the A␤
protein samples (56).
It may be significant that truncated A␤ peptides
that are unable to form fibrils can nevertheless
induce ion permeability (142) and that membranes
formed from highly compressible lipids are most
sensitive to A␤-induced changes in permeability
(297). It has been suggested that channel openings
are merely protein-induced defects in the bilayer
structure or organization that heal after a time,
giving the appearance of a transient channel opening (114). This mechanism would be consistent
with oligomer-induced membrane thinning (297)
and would help resolve the paradoxical appearance of many simultaneous pore structures in
membranes that exhibit only single channel conductances (96).
In living cells, as opposed to synthetic systems,
one must consider the possibility that A␤ may profoundly affect the behavior of naturally occurring
channels and transporters. For example, A␤42 increases HNE-modification of a glutamate transporter in synaptosomes (177). A␤ oligomers have
been implicated in causing a pathological calcium
influx through hippocampal NMDA receptors, followed by the activation of calpain and the degradation of dynamic 1-a GTPase involved in synaptic
vesicle recycling (155). A␤ proteins have also been
shown to depress the surface concentration of
AMPA receptors involved in calcium regulation at
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physical attacks on the barrier function of membranes (265). For example, A␤ proteins or their
fragments have been observed to penetrate the
membrane surface (82, 94), disrupt raft-like domains (67), cross the membrane (341), induce isotropic phases (176), increase the permeability of
membranes to various materials (154, 344), cause
physical thinning (81), decrease the mobility of
hydrophobic membrane probes (169), activate
phospholipase A2 (182), and promote membrane
fusion (81, 249). Membrane binding by A␤ proteins
appears to mediate some forms of neurotoxicity
(21, 70, 316). Plasma membranes isolated from human brain accelerate A␤ fibrillogenesis (339),
whereas fibrillizing A␤ proteins disrupt the structure of membranes formed from both synthetic
lipids (168, 169) and whole-brain lipid extracts
(353). The action of A␤ proteins on membranes has
been compared with the action of antimicrobial
peptides, and homogenates of brain with AD have
elevated antimicrobial activity (299). Among the
effects of A␤ proteins on membranes, however, the
formation of ion channels has received the most
attention (10 –12, 93, 147, 186, 251).
A␤ proteins share an ability to induce channel-like
activity in membranes with a wide variety of other
amyloid-forming proteins (259). In the case of A␤, the
channels exhibit only modest cation selectivity but
very long lifetimes. A␤ cation channels can be
blocked by Zn2⫹, suggesting the possibility that they
may be therapeutic targets (9), and small molecule
inhibitors of the A␤ calcium channel have been described (88). Ring-like structures possibly representing these pores or channels have been observed in
membranes by AFM (173, 186, 259) and EM (174,
175). Although such features are not always observed
with A␤ proteins (114, 341), there are many reports
suggesting that they are formed by other amyloidogenic proteins such as the insulin-associated polypeptide, ␣-synuclein, and serum amyloid A protein
(259). It has been suggested that the channel-forming
FIGURE 3. Immunofluorescent staining of the posterior parietal association area in a transgenic mouse model of Alzheimer’s
disease that expressed amyloid precursor protein with the “Swedish” K670N/M671L mutation, and presenilin 1 with the
M146L mutation
A: 2H4 antibodies (Covance) specific for the amino terminus A␤ proteins (green). B: HNE 11S specific for HNE-His adducts (red). C: A and B
superimposed. Possible reasons for the close association of HNE-His epitopes and A␤ proteins, but not precise colocalization, are discussed
in the text.
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the synapse (133, 188). The dysregulation of calcium has long been associated with AD pathogenesis (172) and is thought to be involved with the
accumulation of amyloid deposits (85, 208, 209)
and the hyperphosphorylation of tau (25). Calcium
also promotes the conversion of oligomeric A␤ to
fibrils (140). An extensive literature exists on the
role of mitochondria in AD pathogenesis, and the
accumulation of calcium by mitochondria followed by damage to the mitochondrial membrane
structure is a prominent theme in this literature
(131, 246, 262).
The lipids in nascent lipoprotein particles are arranged in a membrane-like bilayer, surrounded by
apolipoprotein molecules in a configuration often
called the “belt” model (FIGURE 4) (280). Apolipoprotein E (ApoE) is a focus of considerable interest
because its isoforms are strongly associated with
the risk of developing AD. In plasma, ApoE is found
with other proteins in lipoprotein particles as diverse as chylomicrons and high-density lipoproteins. In the brain and cerebrospinal fluid, ApoE is
the most abundant apolipoprotein and is found in
particles that resemble high-density lipoproteins
in both density and size (269). Among the three
common isoforms, ApoE3 is the most common
(77% of the alleles) and is therefore considered to
be the wild type. ApoE2 has an R158C substitution,
whereas ApoE4 has a C112R substitution, and both
are associated with forms of hyperlipidemia (197).
One copy of the ApoE4 gene confers a threefold
increased risk of Alzheimer’s disease, whereas two
FIGURE 4. Nascent lipoprotein E particles consist of
␣-helical “belts” around the perimeter of a lipid bilayer
disk
For this arrangement and the number of protein and lipid molecules in a particle, there is excess protein, which may situate
across the face of the disk. When the protein is apoE3, there is
one thiol group for every 45 lipids, concentrating a large antioxidant capacity in close proximity to the lipids.
60
PHYSIOLOGY • Volume 26 • February 2011 • www.physiologyonline.org
Toward a Comprehensive Theory
of AD Pathogenesis
The cause of AD is known in cases of familial
disease, but that knowledge has not clarified how
sporadic disease develops, nor has it so far yielded
an effective therapy for either form of the disease.
Clearly, we need a more detailed theory of AD
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The Lipids Associated With
Apolipoprotein E
copies confer an eightfold increased risk. One copy
of the ApoE2 gene, however, reduces the risk by
60% (73).
In addition to the epidemiological evidence,
there is an abundance of experimental evidence
linking ApoE to the pathogenesis of Alzheimer’s
disease. For example, the ApoE4 allele is associated
with increased A␤ deposits in the brain, and
a distinct neuropathological phenotype (278),
whereas a lack of ApoE reduces A␤ deposition in
mice (19). Amyloid plaques bind anti-ApoE antibodies, suggesting that ApoE is present in these
plaques (3). Indeed, ApoE copurifies with A␤ from
amyloid plaques (26) and may exist as a bound
complex with A␤ proteins (245, 349). Some have
suggested that ApoE4 accelerates fibril formation
by A␤40 (18, 194, 271, 343), but its behavior in this
regard may depend on whether it is monomeric or
dimeric. Others have suggested that dimeric forms
inhibit fibril formation and that ApoE3 is much
more effective at doing this because a large fraction
circulates as a disulfide-linked dimer, whereas
ApoE4 cannot form disulfide bonded dimers due to
its C112R substitution (99, 340). Despite all of these
observations, the reason that different isoforms of
ApoE have different levels of risk for AD is not known.
There are no isoform-dependent differences in the
apparent structure of lipoprotein particles (280). A
case for isoform-specific direct interactions between
ApoE and A␤ proteins has been made (233), but clear
conclusions are elusive due to problems with protein
purity, aggregation and denaturation of the ApoE
protein, and indirect assay methods (4, 171, 198, 245,
303, 307).
Others have suggested that risk of AD with ApoE
isoforms may be related to differences in antioxidant activity (178, 217, 312). ApoE4 has no Cys
residues and, hence, no free thiol groups; ApoE3
has one Cys, whereas ApoE2 has two. Free thiol
groups have significant antioxidant activity via
mechanisms that differ from those of glutathione
(109, 333, 359). In apoA-I, variants with a free Cys
residue side chain exhibit significantly greater antioxidant activity than variants without a free Cys
residue (29). Therefore, it is intriguing to speculate
that ApoE4 confers increased risk of AD, whereas
ApoE2 confers decreased risk, because Cys residue
side chains protect lipids in lipoprotein E particles
against oxidative stress.
REVIEWS
No conflicts of interest, financial or otherwise, are declared by the author(s).
FIGURE 5. Membrane-mediated amplification of fibrillogenesis, illustrating
possible relationships between meachanisms involved in A␤ protein
aggregation and neurotoxic mechanisms involved in the pathogenesis of
Alzheimer’s disease
Lipid oxidation products modify the three His residues of A␤42, increasing its membrane
affinity and accelerating the conversion of A␤40 into oligomers and fibrils. Oligomeric A␤
proteins bind copper ions while they undergo redox cycling. Highly reactive oxygen species may be generated by electrons from copper or as by-products of inflammation, including inflammation induced by trauma. ApoE4 alleles lack thiol-mediated antioxidant
activity and may allow excess oxidative damage to the lipids in lipoprotein particles. Aging
by itself is associated with reduced tissue antioxidant levels and accumulated oxidative
lipid damage. During any or all of these processes, direct neurotoxins may be produced,
and A␤ proteins may form pores, channels, or other disruptive neurotoxic structures in
neuronal membranes.
The authors are supported by grants from the National
Institute on Aging, the Alzheimer’s Association, and the
American Health Assistance Foundation.
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