In a step towards a possible treatment for Huntington's disease, scientists at Albert Einstein College of Medicine of Yeshiva University have shown for the first time that the accumulation of a mutated protein may explain damaging cellular behavior in Huntington's disease. Their research is described in the April 11 online edition of Nature Neuroscience.
Huntington's disease, which afflicted the folksinger Woody Guthrie, is a fatal, inherited neurodegenerative disorder. While subtle personality changes and diminished physical skills may occur early in the disease, it typically becomes noticeable during middle age. Later problems include dementia and chorea – jerky movements that are random and uncontrollable.
Huntington's disease results from a gene mutation that leads to a defective form of the huntingtin protein. The mutation is dominant, meaning that a child of an affected parent has a 50 percent chance of inheriting Huntington's. And since the defective protein is present in all of a person's cells, the disease causes problems in the brain and throughout the body.
"Studies have shown that Huntington's disease occurs in part because the mutated huntingtin protein accumulates within cells and is toxic to them," said Ana Maria Cuervo, M.D., Ph.D., professor of developmental and molecular biology, of anatomy and structural biology, and of medicine at Einstein and senior author of the Nature Neuroscience study. "In our investigation of how the accumulating huntingtin protein affects the functioning of cells, we found that it interferes with the cells' ability to digest and recycle their contents."
All cells rely on several different mechanisms to break down "old" proteins and other components and recycle them. Collectively known as autophagy (literally, "self-eating"), these processes keep cells clean and uncluttered and provide them with replacement parts that will function better.
Dr. Cuervo and her team had previously shown that a glitch in autophagy may trigger Parkinson's disease by allowing a toxic protein to accumulate. She suspected that something similar was going on in Huntington's disease. After studying two mouse models of Huntington's disease as well as lymphoblasts (white cells) from people with the disease, she and her team found that the mutated huntingtin protein was sabotaging the cell's garbage-collecting efforts.
One mechanism for cleaning up cells involves forming a membrane around the protein or other cellular structure requiring removal. These "garbage bags" (more formally known as autophagosomes) then travel to enzyme-filled sacs known as lysosomes that fuse with the bags and digest their cargo. But the clean-up efforts go awry in Huntington's disease.
Dr. Cuervo and her team found that the defective huntingtin proteins stick to the inner layer of autophagosomes, preventing them from gathering garbage. The result: Autophagosomes arrive empty at the lysosomes; and cellular components that should be recycled instead accumulate, causing toxicity that probably contributes to cell death.
This finding, Dr. Cuervo noted, shows that activating the lysosomes of cells – one of the proposed treatments for Huntington's disease – won't do any good.
"It doesn't matter how active your lysosomes are if they're not going to receive any cellular components to digest," she said. "Instead, we should focus on treatments to help autophagosomes recognize intracellular garbage, perhaps by minimizing their contact with the defective huntingtin protein. By enhancing the clearance of cellular debris, we may be able to keep Huntington's patients free of symptoms for a longer time."
The paper, "Cargo recognition failure is responsible for inefficient autophagy in Huntington's disease," appears in the April 11 online issue of Nature Neuroscience. The research was initiated by Marta Martinez-Vicente, Ph.D., a postdoctoral fellow in Dr. Cuervo's lab, who is now at the Institute of Neuropathology in Barcelona, Spain. Esther Wong, Ph.D., currently a postdoctoral fellow with Dr. Cuervo, continued and completed the research. Other Einstein researchers involved in the study were Hiroshi Koga, Ph.D., Susmita Kaushik Ph.D., and Esperanza Arias Ph.D. This work was done in collaboration with the team of Dr. David Sulzer at Columbia University Medical School.
About Albert Einstein College of Medicine of Yeshiva University
Albert Einstein College of Medicine of Yeshiva University is one of the nation's premier centers for research, medical education and clinical investigation. During the 2009-2010 academic year, Einstein is home to 2,775 faculty members, 722 M.D. students, 243 Ph.D. students, 128 students in the combined M.D./Ph.D. program, and approximately 350 postdoctoral research fellows. In 2009, Einstein received more than $155 million in support from the NIH. This includes the funding of major research centers at Einstein in diabetes, cancer, liver disease, and AIDS. Other areas where the College of Medicine is concentrating its efforts include developmental brain research, neuroscience, cardiac disease, and initiatives to reduce and eliminate ethnic and racial health disparities. Through its extensive affiliation network involving five medical centers in the Bronx, Manhattan and Long Island – which includes Montefiore Medical Center, The University Hospital and Academic Medical Center for Einstein – the College of Medicine runs one of the largest post-graduate medical training programs in the United States, offering approximately 150 residency programs to more than 2,500 physicians in training.
Deirdre Branley | EurekAlert!
Laser activated gold pyramids could deliver drugs, DNA into cells without harm
24.03.2017 | Harvard John A. Paulson School of Engineering and Applied Sciences
What does congenital Zika syndrome look like?
24.03.2017 | University of California - San Diego
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
24.03.2017 | Materials Sciences
24.03.2017 | Physics and Astronomy
24.03.2017 | Physics and Astronomy