News Release
Thursday, July 27, 2017
NIH-funded study suggests role for specific immune cells in brain disease.
A new study suggests that T cells, which help the bodys immune system recognize friend from foe, may play an important role in Parkinsons disease (PD). The study, published in the journal Nature, was supported by the National Institute of Neurological Disorders and Stroke (NINDS), part of the National Institutes of Health.
This collaboration between neuroscientists and immunologists provides important new evidence for ways in which the immune system can play a role in PD, a link that can be used to further define this interaction, said Beth-Anne Sieber, Ph.D., a program director at NINDS.
A research team led by David Sulzer, Ph.D., professor of neurology at Columbia University in New York City and Alessandro Sette, Dr.Biol.Sci., professor of infectious diseases at the La Jolla Institute for Allergy and Immunology in California, examined the role of T cells in PD.
Drs. Sulzer and Sette, along with their colleagues, collected blood samples from 67 individuals with Parkinsons disease and 36 healthy controls. Immune cells were extracted from the samples and mixed with portions of the alpha-synuclein protein, which accumulates in the brains of people with PD and can result in cell death.
They found that T cells from people with PD responded to the presence of alpha-synuclein to a much greater degree than those gathered from the control group.
In particular, two regions of alpha-synuclein evoked reactions from T cells: a section that often contains mutations linked with PD, and a portion undergoing a chemical change that can lead to accumulation of the protein in the brain.
The researchers identified four genetic variations that were associated with T cell reactivity to alpha-synuclein. More than half of people with PD carried at least one of those variants, compared to 20 percent of controls.
These findings expose a potential biomarker for PD that may someday help in diagnosing the disease or be used to evaluate how well treatments are working, said Dr. Sette.
According to the authors, the results suggest that PD may have characteristics of an autoimmune disease, in which the immune system incorrectly attacks the bodys own cells.
As we age, proteins throughout the body undergo various molecular modifications. If they become unrecognizable, the immune system may start going after them, thinking they may be dangerous invaders, said Dr. Sulzer.
PD is a neurodegenerative disorder in which dopamine-producing brain cells die off, resulting in tremors, muscle stiffness, loss of balance and slow movement. Additional symptoms may include emotional changes and disrupted sleep.
More research is needed to learn about the interactions between immune cells and alpha-synuclein. Improved understanding of those interactions may lead to information about disease progression as well as potential connections to other neurodegenerative disorders.
This study was funded by grants from NINDS (NS38377).
For more information:https://www.ninds.nih.gov/Disorders/All-Disorders/Parkinsons-Disease-Information-Page
The NINDS is the nations leading funder of research on the brain and nervous system.The mission of NINDS is to seek fundamental knowledge about the brain and nervous system and to use that knowledge to reduce the burden of neurological disease.
About the National Institutes of Health (NIH):NIH, the nation's medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit http://www.nih.gov.
NIHTurning Discovery Into Health
ReferenceSulzer D et al. T cells of Parkinsons disease patients recognize alpha-synuclein peptides. Nature. June 21, 2017.
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