Amyloid beta refers to peptides of 36–43 amino acids that are crucially involved in Alzheimer’s disease as the main component of the amyloid plaques found in the brains of Alzheimer patients. The peptides result from the amyloid precursor protein (APP), which is cleaved by beta secretase and gamma secretase to yield Amyloid beta (Aβ). Aβ molecules can aggregate to form flexible soluble oligomers which may exist in several forms.
It is now believed that certain misfolded oligomers (known as “seeds”) can induce other Aβ molecules to also take the misfolded oligomeric form, leading to a chain reaction akin to a prion infection. The seeds or the resulting amyloid plaques are toxic to nerve cells.
A recent study suggested that APP and its amyloid potential is of ancient origins, dating as far back as early deuterostomes.
The normal function of Aβ is not well understood. Though some animal studies have shown that the absence of Aβ does not lead to any loss of physiological function, several potential activities have been discovered for Aβ, including activation of kinase enzymes, protection against oxidative stress, regulation of cholesterol transport, functioning as a transcription factor, and anti-microbial activity (potentially associated with Aβ’s pro-inflammatory activity).
The glymphatic system clears metabolic waste from the mammalian brain, and in particular beta amyloids. The rate of removal is significantly increased during sleep. However the significance of the glymphatic system is unknown in clearance of Aβ.
Amyloid Beta Disease Links
Aβ is the main component of amyloid plaques (extracellular deposits found in the brains of patients with Alzheimer’s disease). Similar plaques appear in some variants of Lewy body dementia and in inclusion body myositis (a muscle disease), while Aβ can also form the aggregates that coat cerebral blood vessels in cerebral amyloid angiopathy.
The plaques are composed of a tangle of regularly ordered fibrillar aggregates called amyloid fibers, a protein fold shared by other peptides such as the prions associated with protein misfolding diseases.
Recent research suggests that soluble oligomeric forms of the peptide may be causative agents in the development of Alzheimer’s disease. It is generally believed that Aβ oligomers are the most toxic. A number of genetic, cell biology, biochemical and animal studies support the concept that Aβ plays a central role in the development of Alzheimer’s disease pathology.
It is unresolved how Aβ accumulates in the central nervous system and subsequently initiates the disease of cells. Some researchers have found that the Aβ oligomers induce some of the symptoms of Alzheimer’s Disease by competing with insulin for binding sites on the insulin receptor, thus impairing glucose metabolism in the brain.
Significant efforts have been focused on the mechanisms responsible for Aβ production, including the proteolytic enzymes gamma– and β-secretases which generate Aβ from its precursor protein, APP (amyloid precursor protein). Aβ circulates in plasma, cerebrospinal fluid (CSF) and brain interstitial fluid (ISF) mainly as soluble Aβ40. Senile plaques contain both Aβ40 and Aβ42, while vascular amyloid is predominantly the shorter Aβ40.
Increases in either total Aβ levels or the relative concentration of both Aβ40 and Aβ42 (where the former is more concentrated in cerebrovascular plaques and the latter in neuritic plaques) have been implicated in the pathogenesis of both familial and sporadic Alzheimer’s disease. Due to its more hydrophobic nature, the Aβ42 is the most amyloidogenic form of the peptide. However the central sequence KLVFFAE is known to form amyloid on its own, and probably forms the core of the fibril.
The “amyloid hypothesis”, that the plaques are responsible for the pathology of Alzheimer’s disease, is accepted by the majority of researchers but is by no means conclusively established. An alternative hypothesis is that amyloid oligomers rather than plaques are responsible for the disease.
Mice that are genetically engineered to express oligomers but not plaques (APPE693Q) develop the disease. Furthermore, mice that are in addition engineered to convert oligomers into plaques (APPE693Q X PS1ΔE9), are no more impaired than the oligomer only mice. Intra-cellular deposits of tau protein are also seen in the disease, and may also be implicated, as has aggregation of alpha synuclein.
Currently, research is being done using biomarkers and ELISA tests to determine levels of amyloid beta so blood tests can detect Alzheimer’s Disease in its early stages. Of 24 biomarkers, 3 were confirmed to be reliable identification markers of AD patients.
Formation of Amyloid Beta
Aβ is formed after sequential cleavage of the amyloid precursor protein (APP), a transmembrane glycoprotein of undetermined function. APP can be cleaved by the proteolytic enzymes α-, β- and γ-secretase; Aβ protein is generated by successive action of the β and γ secretases.
The γ secretase, which produces the C-terminal end of the Aβ peptide, cleaves within the transmembrane region of APP and can generate a number of isoforms of 30-51 amino acid residues in length. The most common isoforms are Aβ40 and Aβ42; the longer form is typically produced by cleavage that occurs in the endoplasmic reticulum, while the shorter form is produced by cleavage in the trans-Golgi network.
The Aβ40 form is the more common of the two, but Aβ42 is the more fibrillogenic and is thus associated with disease states. Mutations in APP associated with early-onset Alzheimer’s have been noted to increase the relative production of Aβ42, and thus one suggested avenue of Alzheimer’s therapy involves modulating the activity of β and γ secretases to produce mainly Aβ40. Aβ is destroyed by several amyloid-degrading enzymes including neprilysin.
Researchers in Alzheimer’s disease have identified five strategies as possible interventions against amyloid:
These work to block the first cleavage of APP inside of the cell, at the endoplasmic reticulum.
(e. g. semagacestat). These work to block the second cleavage of APP in the cell membrane and would then stop the subsequent formation of Aβ and its toxic fragments.
Selective Aβ42 lowering agents (e. g. tarenflurbil). These modulate γ-secretase to reduce Aβ42 production in favor of other (shorter) Aβ versions.
β- and γ-secretase are responsible for the generation of Aβ from the release of the intracellular domain of APP, meaning that compounds that can partially inhibit the activity of either β- and γ-secretase are highly sought after. In order to initiate partial inhibition of β- and γ-secretase, a compound is needed that can block the large active site of aspartyl proteases while still being capable of bypassing the blood-brain barrier.
To date, human testing has been avoided due to concern that it might interfere with signaling via Notch proteins and other cell surface receptors.
This stimulates the host immune system to recognize and attack Aβ, or provide antibodies that either prevent plaque deposition or enhance clearance of plaques or Aβ oligomers. Oligomerization is a chemical process that converts individual molecules into a chain consisting of a finite number of molecules.
Prevention of oligomerization of Aβ has been exemplified by active or passive Aβ immunization. In this process antibodies to Aβ are used to decrease cerebral plaque levels. This is accomplished by promoting microglial clearance and/or redistributing the peptide from the brain to systemic circulation.
One such beta-amyloid vaccine that is currently in clinical trials is CAD106. Immunization with synthetic Aβ1-42 has been shown to be beneficial in mice and displays low toxicity; however human trials have shown no significant differences. Thus, it is not yet effective in humans and requires further research.
Specific findings show that the 20 amino acid SDPM1 protein binds tetramer forms of Aβ(1-40)- and Aβ(1-42)-amyloids and blocks subsequent Aβ amyloid aggregation. It is important to note that this study was done in mice and that while it prevents further development of neuropathology it did not result in an improvement in cognitive performance.
Such as apomorphine. These prevent Aβ fragments from aggregating or clear aggregates once they are formed.
Studies comparing synthetic to recombinant Aβ42 in assays measuring rate of fibrillation, fibril homogeneity, and cellular toxicity showed that recombinant Aβ42 had a faster fibrillation rate and greater toxicity than synthetic Amyloid beta 1-42 peptide. This observation combined with the irreproducibility of certain Aβ42 experimental studies has been suggested to be responsible for the lack of progress in Alzheimer’s research.
This anti-aggregatory activity occurs only through an interaction with dimers of the soluble amyloid beta peptide. Melatonin does not reverse fibril formation or oligomers of amyloid beta once they are formed. This is supported by experiments in transgenic mice which suggest that melatonin has the potential to prevent amyloid deposition if administered early in life, but it may not be efficacious to revert amyloid deposition or treat Alzheimer’s disease.
This connection with melatonin, which regulates sleep, is strengthened by the recent research showing that the wakefulness inducing hormone orexin influences amyloid beta. Interestingly, animal experiments show that melatonin may also correct mild elevations of cholesterol which is also an early risk factor for amyloid formation in human brain.
The cannabinoid HU-210 has been shown to prevent amyloid beta-promoted inflammation. The endocannabinoids anandamide and noladin ether have also been shown to be neuroprotective against amyloid beta in vitro.
It has been shown that high-cholesterol diets tend to increase Aβ pathology in animals. Modulating cholesterol homeostasis has yielded results that show that chronic use of cholesterol-lowering drugs, such as the statins, is associated with a lower incidence of AD.
In APP genetically modified mice, cholesterol-lowering drugs have been shown to reduce overall pathology. While the mechanism is poorly understood it appears that cholesterol-lowering drugs have a direct effect on APP processing.
Chelation therapy, which involves the removal of heavy metals from the body, has also been shown to be beneficial in lowering amyloid plaque levels. This is because Aβ aggregation is somewhat dependent on the metal ions copper and zinc. Zinc in synaptic vesicles, which is under the control of the zinc transporter ZnT3, plays a major role in Aβ formation.
The expression of the ZnT3 is significantly lower in Alzheimer’s patients compared to healthy patients. Mice without ZnT3 were found to have much higher plaque formation. Further promoting this concept, Aβ deposition was impeded in APP transgenic mice treated with the antibiotic clioquinol, a known copper/zinc chelator.
Drug therapy has been another approach to treatment.
Memantine is an Alzheimer’s drug which has received widespread approval. It is a non-competitive N-methyl-D-aspartate (NMDA) channel blocker. By binding to the NMDA receptor with a higher affinity than Mg2+ ions, memantine is able to inhibit the prolonged influx of Ca2+ ions, particularly from extrasynaptic receptors, which forms the basis of neuronal excitotoxicity. It is an option for the management of patients with moderate to severe Alzheimer’s Disease. The study showed that 20 mg/day improved cognition, functional ability and behavioural symptoms in patient population.
Another drug that is currently under research is victoza, which is typically used as a diabetes drug. Treatment with victoza yielded cognitive benefits that included improved object and spatial recognition. Additionally victoza enhances induction and maintenance of long term potentiation (LTP) and paired-pulse facilitation (PPF) in both APP/PS1 and non-genetically altered mice.
Other histological benefits include a reduced inflammatory response and an increase in the number of young neurons in the dentate gyrus. The β-amyloid level was also found to be significantly reduced.