What disease is alpha-synuclein involved in?
Alpha-synuclein (α-Syn) is a key protein involved in Parkinson’s disease (PD) pathology. PD is characterized by the loss of dopaminergic neuronal cells in the substantia nigra pars compacta and the abnormal accumulation and aggregation of α-Syn in the form of Lewy bodies and Lewy neurites.
How does alpha-synuclein cause cell death?
α-Synuclein can bind to the membranes of lysosomes [135] and inhibit lysosomal function [163] and chaperone-mediated autophagy [135].
What is alpha-synuclein pathology?
Alpha-synuclein is a small protein made up of 140 amino acids. Originally discovered to be encoded by the SNCA gene in 1997, it was found that a single missense mutation in this gene gave rise to an autosomal-dominant form of PD (Polymeropoulos et al., 1997).
What causes the buildup of alpha-synuclein *?
The neuronal toxicities of α-synuclein caused by genetic mutations or epigenetic mechanisms appear to involve many pathways and cellular functions, including endocytosis, Golgi homeostasis, ER-to-Golgi transport, presynaptic trafficking, UPS, autophagy, ER, and oxidative and nitration stress [62–64].
Why do Lewy bodies cause cell death?
In DLB, the mitochondria are drawn into the Lewy body and the mitochondrial integrity is lost. This work suggests that Lewy bodies are cytotoxic. In DLB, we suggest that microtubule regression and mitochondrial loss results in decreased cellular energy and axonal transport that leads to cell death.
Where is synuclein Alpha made?
Alpha-synuclein is a synuclein protein of unknown function primarily found in neural tissue, making up as much as one percent of all proteins in the cytosol of brain cells.
Is alpha-synuclein a membrane protein?
With only 140 amino acids, α-Synuclein (α-Syn) is a small peripheral membrane protein that localizes specifically to the axon terminal in neurons (Maroteaux et al., 1988; George et al., 1995; Iwai et al., 1995; Bendor et al., 2013).
How does alpha-synuclein accumulate?
Our results reveal that α-syn accumulates within the liver and may be derived from the brain or other peripheral sources. Collectively, our findings indicate that the liver may play a role in the clearance and detoxification of pathological proteins in PD and related synucleinopathies.
What cells produces alpha-synuclein?
α-Synuclein is widely expressed in the brain, in both neuronal and nonneuronal cell types, including dopaminergic neurons, cortical neurons, noradrenergic neurons, endothelial cells, and platelets [62–64].
What is the protein in Lewy bodies?
Lewy bodies are spherical inclusions located in the cytoplasm of neurons which characteristically contain a protein known as α-synuclein. Originally Lewy bodies were considered to be a prominent feature of Parkinson’s disease and were not associated with late life dementia.
What part of the brain is affected by Lewy body?
Lewy bodies affect several different brain regions in LBD: the cerebral cortex, which controls many functions, including information processing, perception, thought, and language. the limbic cortex, which plays a major role in emotions and behavior. the hippocampus, which is essential to forming new memories.
Is alpha-synuclein an enzyme?
Alpha-synuclein is a protein that, in humans, is encoded by the SNCA gene. Alpha-synuclein is a neuronal protein that regulates synaptic vesicle trafficking and subsequent neurotransmitter release.
What is synuclein in the brain?
Synuclein is a protein associated with synapses in the brain; it accumulates with ubiquitin as spherical structures (Lewy bodies) within neurons, particularly of the substantia nigra and locus coeruleus in Parkinson’s disease.