Protein Build-up Leads to Neurons Misfiring
News Jul 20, 2012
The findings — the first recorded in vivo using a transgenic mouse model of Parkinson's disease — are published in today's (July 18) issue of the Journal of Neuroscience and provide new insights into how Parkinson's disease and other neurodegenerative disorders known as synucleinopathies work and progress at the cellular level.
Previous in vitro studies using cell cultures had suggested abnormal accumulation of alpha-synuclein dysregulated intracellular handling and movement of calcium, which is used as a signaling molecule and neurotransmitter. It was unclear, however, whether calcium alterations occurred in more complex, living animals.
"This is the first time we've been able to verify the role of alpha-synuclein aggregates in vivo," said senior author Eliezer Masliah, M.D., professor of neurosciences and pathology.
"The aggregates affect the cell membrane of neurons, making them more porous. They also affect the membranes of organelles inside neurons, such as the mitochondria that are part of the cell's machinery for generating energy. Energy is necessary to pump calcium in and out of the cell. If mitochondria membranes are compromised, calcium accumulates, further damaging the neuron and causing it to misfire."
Masliah said the new revelations, made using imaging technologies developed by first author Anna Devor, Ph.D., associate adjunct professor of neuroscience, may help scientists and doctors quantify and repair neuronal damage caused by alpha-synuclein accumulation.
"We have already started to utilize this discovery as a bio-marker and reporter of neuronal damage," said Masliah. "We have compounds developed in collaboration with others to ‘plug' the holes in the neurons and mitochondria and prevent the abnormal calcium currents. We can monitor in real-time in live animals how our drugs revert the toxic effects of alpha-synuclein. This represents a unique and fast strategy to evaluate novel compounds."
Co-authors are Lidia Reznichenko, Qun Cheng, Krystal Nizar, Payam A. Saisan, Edward M. Rockenstein, Tanya Gonzalez, Christina Patrick, Brian Spencer and Paula Desplats, Department of Neurosciences, UC San Diego; Sergey L. Gratiy, Department of Radiology, UC San Diego; Anders M. Dale, departments of Neurosciences and Radiology, UC San Diego; Anna Devor, departments of Neurosciences and Radiology, UC San Diego; and Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School.
Funding for this research came, in part, from the National Institute on Aging (grant AG-02270), The National Institute of Neurological Disorders and Stroke (grants NS-051188, NS-057198 and NS-0507096), the National Institute of Biomedical Imaging and Bioengineering (grants EB-009118 and EB-000790) and the Short Family Fund.
Innate Reaction of Hematopoietic Stem Cells to Severe InfectionsNews
Researchers at the University of Zurich have shown for the first time that hematopoietic stem cells detect infectious agents themselves and begin to divide, without signals from growth factors.READ MORE
New Way Found to Boost Immunity in Fighting Cancer and InfectionsNews
Researchers have identified a key new mechanism that regulates the ability of T-cells of the immune system to react against foreign antigens and cancer.READ MORE
Comments | 0 ADD COMMENT
EMBL Conference: European Conference of Life Science Funders and Foundations
Apr 19 - Apr 20, 2018
EMBL Course: Transgenic Animals - Micromanipulation Techniques
Apr 10 - Apr 11, 2018
EMBO Practical Course: Extracellular Vesicles: From Biology to Biomedical Applications
Apr 09 - Apr 13, 2018