What is the role of alpha-synuclein?

Alpha-synuclein is a neuronal protein that regulates synaptic vesicle trafficking and subsequent neurotransmitter release. It is abundant in the brain, while smaller amounts are found in the heart, muscle and other tissues.

How does synuclein cause Parkinson’s disease?

α-Synuclein may contribute to PD pathogenesis in a number of ways, but it is generally thought that its aberrant soluble oligomeric conformations, termed protofibrils, are the toxic species that mediate disruption of cellular homeostasis and neuronal death, through effects on various intracellular targets, including …

Where are Lewy bodies first found in Parkinson’s?

SUMMARY The Lewy body is a distinctive neuronal inclusion that is always found in the substantia nigra and other specific brain regions in Parkinson’s disease. It is mainly composed of structurally altered neurofilament, and occurs wherever there is excessive loss of neurons.

What is alpha-synuclein neurodegeneration?

Alpha-synuclein is a 140 amino acid neuronal protein that has been associated with several neurodegenerative diseases. A point mutation in the gene coding for the alpha-synuclein protein was the first discovery linking this protein to a rare familial form of Parkinson’s disease (PD).

What is the structure of alpha-synuclein?

The alpha-synuclein (α-syn) protein is encoded by the SNCA gene localized on the long arm of chromosome 4 (Chr 4q22. 1), composed of 140 amino acid residues with a molecular weight of approximately 15 kDa (Lee and Trojanowski, 2006; Bendor et al., 2013), which presents three domains.

What does alpha-synuclein do in Parkinsons?

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 do you get rid of alpha-synuclein?

Extracellular alpha-synuclein is cleared by extracellular proteolytic enzymes, or taken up by neighboring cells, especially microglia and astrocytes, and degraded within lysosomes.

Is Lewy bodies linked to Parkinson’s?

LBD is not the same as Parkinson’s, but the two are closely related: LBD causes some or all of the motor symptoms of Parkinson’s. More than 1 million people in the U.S. are affected by Lewy body dementia, according to the Lewy Body Dementia Association.

Do all Parkinson’s patients have Lewy bodies?

The presence of Lewy bodies However, Lewy bodies are also common with other conditions, such as Alzheimer’s and Parkinson’s disease. In fact, most people with PD also have Lewy bodies in their brain. However, even if they have Lewy bodies, not all Parkinson’s patients will also develop LBD.

Does immunotherapy with the 5C1 analog of 9e4 reduce α-Syn activity?

Immunotherapy with the 5C1 analog of 9E4, but not with the 5D12 analog, reduced α-syn accumulation and related deficits in vivo. Consistent with this finding, 5D12 blocked the CT cleavage of α-syn and the propagation of α-syn to a lesser extent. The explanation for these differences in activity between 5C1 and 5D12 is not clear.

Do alpha-synuclein fibrils induce Lewy body pathology?

Pharmacol Ther 138:311–322, doi:10.1016/j.pharmthera.2013.01.013, pmid:23384597. (2011) Exogenous alpha-synuclein fibrils induce Lewy body pathology leading to synaptic dysfunction and neuron death. Neuron 72:57–71, doi:10.1016/j.neuron.2011.08.033, pmid:21982369.

What are α-synuclein-related neurodegenerative conditions?

Neurodegenerative conditions with neuronal accumulation of α-synuclein (α-syn) are common causes of dementia and movement disorders in the aging population ( Savica et al., 2013 ).

Is alpha-synuclein phosphorylation and truncation normal in the human brain?

(2012) alpha-synuclein phosphorylation and truncation are normal events in the adult human brain. Neuroscience 200:106–119, doi:10.1016/j.neuroscience.2011.10.042, pmid:22079575. (2000) Synucleins are developmentally expressed, and alpha-synuclein regulates the size of the presynaptic vesicular pool in primary hippocampal neurons.