{"632029":{"#nid":"632029","#data":{"type":"news","title":"Flickering Light Mobilizes Brain Chemistry That May Fight Alzheimer\u2019s","body":[{"value":"\u003Cp\u003EFor over a century, Alzheimer\u0026rsquo;s disease has confounded all attempts to treat it. But in recent years, perplexing experiments using flickering light have shown promise.\u003C\/p\u003E\r\n\r\n\u003Cp\u003ENow, researchers have tapped into how the flicker may work. They discovered in the lab that the exposure to light pulsing at 40 hertz \u0026ndash; 40 beats per second \u0026ndash; causes brains to release a surge of signaling chemicals that may help fight the disease.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThough conducted on healthy mice,\u0026nbsp;\u003Ca href=\u0022https:\/\/www.jneurosci.org\/content\/early\/2019\/12\/18\/JNEUROSCI.1511-19.2019\u0022 rel=\u0022noopener noreferrer\u0022 target=\u0022_blank\u0022\u003Ethis new study\u003C\/a\u003E\u0026nbsp;is directly connected to human trials, in which Alzheimer\u0026rsquo;s patients are exposed to 40 Hz light and sound. Insights gained in mice at the Georgia Institute of Technology are informing the human trials in collaboration with Emory University.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;I\u0026rsquo;ll be running samples from mice in the lab, and around the same time, a colleague will be doing a strikingly similar analysis on patient fluid samples,\u0026rdquo; said Kristie Garza, the study\u0026rsquo;s first author. Garza is a graduate research assistant in the lab of Annabelle Singer at Georgia Tech and also a member of Emory\u0026rsquo;s neuroscience program.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EOne of the surging signaling molecules in the new study on mice\u0026nbsp;is strongly associated with the activation of brain immune cells called microglia, which purge an Alzheimer\u0026rsquo;s hallmark \u0026ndash; amyloid beta plaque, junk protein that accumulates between brain cells.\u003C\/p\u003E\r\n\r\n\u003Ch3\u003E\u003Cstrong\u003EImmune signaling\u003C\/strong\u003E\u003C\/h3\u003E\r\n\r\n\u003Cp\u003EIn 2016, researchers discovered that light flickering at 40 Hz mobilized microglia in mice afflicted with Alzheimer\u0026rsquo;s to clean up that junk.\u0026nbsp; The new study looked for brain chemistry that connects the flicker with microglial and other immune activation in mice and exposed a surge of 20 cytokines \u0026ndash; small proteins secreted externally by cells and which signal to other cells. Accompanying the cytokine release, internal cell chemistry \u0026ndash; the activation of proteins by phosphate groups \u0026ndash; left behind a strong calling card.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;The phosphoproteins showed up first. It looked as though they were leading, and our hypothesis is that they triggered the release of the cytokines,\u0026rdquo; said Singer, who co-led the new study and is an\u0026nbsp;\u003Ca href=\u0022https:\/\/bme.gatech.edu\/bme\/faculty\/Annabelle-Singer\u0022 rel=\u0022noopener noreferrer\u0022 target=\u0022_blank\u0022\u003Eassistant professor in the Wallace H. Coulter Department of Biomedical Engineering at Georgia Tech and Emory\u003C\/a\u003E.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;Beyond cytokines that may be signaling to microglia, a number of factors that we identified have the potential to support neural health,\u0026rdquo; said Levi Wood, who co-led the study with Singer and is an\u0026nbsp;\u003Ca href=\u0022https:\/\/www.me.gatech.edu\/faculty\/wood\u0022 rel=\u0022noopener noreferrer\u0022 target=\u0022_blank\u0022\u003Eassistant professor in Georgia Tech\u0026rsquo;s George W. Woodruff School of Mechanical Engineering\u003C\/a\u003E.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe team published\u0026nbsp;its findings\u0026nbsp;\u003Ca href=\u0022https:\/\/www.jneurosci.org\/content\/early\/2019\/12\/18\/JNEUROSCI.1511-19.2019\u0022 rel=\u0022noopener noreferrer\u0022 target=\u0022_blank\u0022\u003Ein the\u0026nbsp;\u003Cem\u003EJournal of Neuroscience\u003C\/em\u003E\u0026nbsp;on February 5, 2020\u003C\/a\u003E. The research was funded by the National Institute of Neurological Disorders and Stroke at the National Institutes of Health, and by the Packard Foundation.\u003C\/p\u003E\r\n\r\n\u003Cp\u003ESinger was co-first author on\u0026nbsp;\u003Ca href=\u0022http:\/\/news.mit.edu\/2016\/visual-stimulation-treatment-alzheimer-1207\u0022 rel=\u0022noopener noreferrer\u0022 target=\u0022_blank\u0022\u003Ethe original 2016 study at the Massachusetts Institute of Technology\u003C\/a\u003E, in which the therapeutic effects of 40 Hz were first discovered in mice.\u003C\/p\u003E\r\n\r\n\u003Ch3\u003E\u003Cstrong\u003ESci-fi surrealness\u003C\/strong\u003E\u003C\/h3\u003E\r\n\r\n\u003Cp\u003EAlzheimer\u0026rsquo;s strikes, with few exceptions, late in life. It\u0026nbsp;\u003Ca href=\u0022https:\/\/www.nia.nih.gov\/health\/alzheimers-disease-fact-sheet#changes\u0022 rel=\u0022noopener noreferrer\u0022 target=\u0022_blank\u0022\u003Edestroys up to 30% of a brain\u0026rsquo;s mass\u003C\/a\u003E, carving out ravines and depositing piles of amyloid plaque, which builds up outside of neurons. Inside neurons, phosphorylated\u0026nbsp;\u003Ca href=\u0022https:\/\/en.wikipedia.org\/wiki\/Tau_protein\u0022 rel=\u0022noopener noreferrer\u0022 target=\u0022_blank\u0022\u003Etau protein\u003C\/a\u003E\u0026nbsp;forms similar junk known as\u0026nbsp;\u003Ca href=\u0022https:\/\/en.wikipedia.org\/wiki\/Neurofibrillary_tangle\u0022 rel=\u0022noopener noreferrer\u0022 target=\u0022_blank\u0022\u003Eneurofibrillary tangles\u003C\/a\u003E\u0026nbsp;suspected of destroying mental functions and neurons.\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAfter many decades of failed Alzheimer\u0026rsquo;s drug trials costing billions, flickering light as a potentially successful Alzheimer\u0026rsquo;s therapy seems surreal even to the researchers.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;Sometimes it does feel like science fiction,\u0026rdquo; Singer said.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe 40 Hz frequency stems from the observation that brains of Alzheimer\u0026rsquo;s patients suffer early on from a lack of what is called gamma, moments of gentle, constant brain waves acting like a dance beat for neuron activity. Its most common frequency is right around 40 Hz, and exposing mice to light flickering at that frequency restored gamma and also appears to have prevented heavy Alzheimer\u0026rsquo;s brain damage.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAdding to the surrealness, gamma has also been associated with esoteric mind expansion practices, in which practitioners perform light and sound meditation. Then, in 2016, research connected gamma to working memory, a function key to train of thought.\u003C\/p\u003E\r\n\r\n\u003Ch3\u003E\u003Cstrong\u003ECytokine bonanza\u003C\/strong\u003E\u003C\/h3\u003E\r\n\r\n\u003Cp\u003EIn the current study, the surging cytokines hinted at a connection with microglial activity, and in particular, the cytokine\u0026nbsp;\u003Ca href=\u0022https:\/\/www.sciencedirect.com\/topics\/biochemistry-genetics-and-molecular-biology\/macrophage-colony-stimulating-factor\u0022 rel=\u0022noopener noreferrer\u0022 target=\u0022_blank\u0022\u003EMacrophage Colony-Stimulating Factor\u003C\/a\u003E\u0026nbsp;(M-CSF).\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;M-CSF was the thing that yelled, \u0026lsquo;Microglia activation!\u0026rsquo;\u0026rdquo; Singer said.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe researchers will look for a causal connection to microglia activation in an upcoming study, but the overall surge of cytokines was a good sign in general, they said.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;The vast majority of cytokines went up, some anti-inflammatory and some inflammatory, and it was a transient response,\u0026rdquo; Wood said. \u0026ldquo;Often, a transient inflammatory response can promote pathogen clearance; it can promote repair.\u0026rdquo;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;Generally, you think of an inflammatory response as being bad if it\u0026rsquo;s chronic, and this was rapid and then dropped off, so we think that was probably beneficial,\u0026rdquo; Singer added.\u003C\/p\u003E\r\n\r\n\u003Ch3\u003E\u003Cstrong\u003EChemical timing\u003C\/strong\u003E\u003C\/h3\u003E\r\n\r\n\u003Cp\u003EThe 40 Hz stimulation did not need long to trigger the cytokine surge.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;We found an increase in cytokines after an hour of stimulation,\u0026rdquo; Garza said. \u0026ldquo;We saw phosphoprotein signals after about 15 minutes of flickering.\u0026rdquo;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EPerhaps about 15 minutes was enough to start processes inside of cells and about 45 more minutes were needed for the cells to secrete cytokines. It is too early to know.\u003C\/p\u003E\r\n\r\n\u003Ch3\u003E\u003Cstrong\u003E20 Hz bombshell\u003C\/strong\u003E\u003C\/h3\u003E\r\n\r\n\u003Cp\u003EAs controls, the researchers applied three additional light stimuli, and to their astonishment, all three had some effect on cytokines. But stimulating with 20 Hz stole the show.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026ldquo;At 20 Hz, cytokine levels were way down. That could be useful, too. There may be circumstances where you want to suppress cytokines,\u0026rdquo; Singer said. \u0026ldquo;We\u0026rsquo;re thinking different kinds of stimulation could potentially become a platform of tools in a variety of contexts like Parkinson\u0026rsquo;s or schizophrenia. Many neurological disorders are associated with immune response.\u0026rdquo;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe research team warns against people improvising light therapies on their own, since more data is needed to thoroughly establish effects on humans, and getting frequencies wrong could possibly even do damage.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAlso read: \u003C\/strong\u003E\u003Ca href=\u0022https:\/\/rh.gatech.edu\/features\/alzheimers-killing-mind-first\u0022\u003E\u003Cstrong\u003E\u0026nbsp;A family coping with Alzheimer\u0026rsquo;s leads you through our fight against it\u003C\/strong\u003E\u003C\/a\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAlso read: \u003C\/strong\u003E\u003Ca href=\u0022https:\/\/rh.gatech.edu\/news\/602586\/data-detectives-shift-suspicions-alzheimers-usual-suspect-inside-villain\u0022\u003E\u003Cstrong\u003EWhy Alzheimer\u0026rsquo;s research probably needs to shift focus\u0026nbsp;\u003C\/strong\u003E\u003C\/a\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cem\u003ELu Zhang and Ben Borron\u0026nbsp;\u003C\/em\u003E\u003Cem\u003Efrom the Wallace H. Coulter Department of Biomedical Engineering at Georgia Tech and Emory University co-authored the study. The research was funded by the\u0026nbsp;\u003C\/em\u003E\u003Cem\u003ENational Institute of Neurological Disorders and Stroke at the National Institutes of Health (grants NIH R01-NS109226 and R01-NS109226-01S1), by the Packard Foundation, the Friends and Alumni of Georgia Tech, and by the Lane family. Any findings, conclusions, and recommendations are those of the authors and not necessarily of the sponsors.\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EWriter \u0026amp;\u0026nbsp;Media Representative\u003C\/strong\u003E: Ben Brumfield (404-272-2780), email:\u0026nbsp;\u003Ca href=\u0022mailto:ben.brumfield@comm.gatech.edu\u0022\u003Eben.brumfield@comm.gatech.edu\u003C\/a\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EGeorgia Institute of Technology\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EThe hope\u0026nbsp;of flickering light and sound to treat Alzheimer\u0026#39;s takes another step forward in this new study, which reveals stark biochemical mechanisms: 40 Hertz stimulation triggers a marked release of signaling chemicals - cytokines.\u003C\/p\u003E\r\n","format":"limited_html"}],"field_summary_sentence":[{"value":"The hope of flickering light to treat Alzheimer\u0027s takes another step forward in this new study, which reveals stark biochemical mechanisms."}],"uid":"31759","created_gmt":"2020-02-03 16:08:02","changed_gmt":"2020-02-06 20:36:12","author":"Ben Brumfield","boilerplate_text":"","field_publication":"","field_article_url":"","dateline":{"date":"2020-02-03T00:00:00-05:00","iso_date":"2020-02-03T00:00:00-05:00","tz":"America\/New_York"},"extras":[],"hg_media":{"632025":{"id":"632025","type":"image","title":"Experimental Alzheimer\u0027s treatment visor and sound","body":null,"created":"1580745156","gmt_created":"2020-02-03 15:52:36","changed":"1580745156","gmt_changed":"2020-02-03 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