image: The new fluorescence sensor lights up neurons when they talk. The sensor was developed by researchers at the University of Virginia School of Medicine and their colleagues in China. view more
Credit: Courtesy Zhu Lab, University of Virginia School of Medicine
Scientists have developed a way to see brain cells talk - to actually see neurons communicate in bright, vivid color. The new lab technique is set to provide long-needed answers about the brain and neurological diseases such as Alzheimer's disease, schizophrenia and depression. Those answers will facilitate new and vastly improved treatments for conditions that have largely resisted scientists' efforts to understand them.
"Before we didn't have any way to understand how [such neurotransmissions] work," said researcher J. Julius Zhu, PhD, of the University of Virginia School of Medicine. "In the case of Alzheimer's, in particular, we spent billions of dollars and we have almost no effective treatment. ... Now, for the first time, we can see what is happening."
Understanding Neurological Diseases
To demonstrate the technique's effectiveness, Zhu's team in Charlottesville and colleagues in China have used it to visualize a poorly understood neurotransmitter called acetylcholine. "Acetylcholine has an important role in how we behave because it affects our memory and mood," Zhu explained. "It affects Alzheimer's, schizophrenia, emotions, depression, all kind of emotion-related diseases and mental problems." (Acetylcholine also plays critical roles elsewhere in the body, such as regulating insulin secretion in the pancreas and in controlling stress and blood pressure.)
Drugs designed to combat Alzheimer's disease actually inhibit acetylcholinesterase, an enzyme that degrades acetylcholine, to boost the effect of diminishing acetylcholine released in the brain, Zhu said. But doctors haven't fully understood how the drugs work, and there's been no way to determine just how much inhibition is needed. "These drugs are not very effective," he said. "They only offer a minor improvement, and once you stop the drug [the symptoms] just seem much worse. So probably in trying to treat these patients, you temporarily enhance them but you actually make them even worse."
By being able to see acetylcholine and other neurotransmitters in action in fluorescent color, doctors will be able to establish a baseline for good health and then work to restore that in patients with neurological diseases.
"We want to first measure how [the neurotransmitters] normally do the job. We've already found that there are acetylcholine transmissions very different from what we would expect," said Zhu, of UVA's Department of Pharmacology. "Then we also want to find how the patient differs. That comparison will provide us important answers."
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Findings Published
The researchers have published their findings in the scientific journal Nature Biotechnology. The project is directed by Yulong Li, PhD, at Peking University in China and Zhu at UVA. PhD student Miao Jing at Peking University and postdoctoral fellow Peng Zhang at UVA are the co-first authors. The other research team members include Guangfu Wang, Huoqing Jiang, Lukas Mesik, Jiesi Feng, Jianzhi Zeng, Shaohua Wang, Jess C. Looby, Nick A. Guagliardo, Linda W. Langma, Ju Lu, Yi Zuo, David A. Talmage, Lorna W. Role, Paula Q. Barrett, Li I. Zhang, Minmin Luo and Yan Song.
The work was supported by the National Basic Research Program of China, the General Program of National Natural Science Foundation of China, the Junior Thousand Talents Program of China and National Institutes of Health grants NS103558, DC008983, MH104227, MH109475, MH109104, NS022061, LH089717, NS053570, NS091452, NS094980, NS092548 and NS104670.
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Journal
Nature Biotechnology