{"id":12938,"date":"2018-03-26T11:00:15","date_gmt":"2018-03-26T09:00:15","guid":{"rendered":"https:\/\/news.embl.de\/?p=12938"},"modified":"2024-03-23T22:02:34","modified_gmt":"2024-03-23T21:02:34","slug":"captured-microglia-nibbling-on-brain-synapses","status":"publish","type":"post","link":"https:\/\/www.embl.org\/news\/science\/captured-microglia-nibbling-on-brain-synapses\/","title":{"rendered":"Captured: microglia nibbling on brain synapses"},"content":{"rendered":"\n<p>Around one in ten cells in your brain are microglia. Cousins of macrophages, they act as the first and main contact in the central nervous system\u2019s active immune defense. They also guide healthy brain development. Researchers have proposed that microglia pluck off and eat synapses &#8211; connections between brain cells &#8211; as an essential step in the pruning of connections during early circuit refinement. But, until now, no one had seen them do it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Microglia make synapses stronger<\/h2>\n\n\n\n<p>That is why Laetitia Weinhard, from the <a href=\"https:\/\/www.embl.it\/research\/unit\/gross\/\">Gross group at EMBL Rome<\/a>, set out on a massive imaging study to actually see this process in action in the mouse brain, in collaboration with the <a href=\"https:\/\/www.embl.de\/research\/units\/cbb\/schwab\/index.html\">Schwab team<\/a> at EMBL Heidelberg. \u201cOur findings suggest that microglia are nibbling synapses as a way to make them stronger, rather than weaker,\u201d says Cornelius Gross, who led the work.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Warm welcome<\/h2>\n\n\n\n<p>The team saw that around half of the time that microglia contact a synapse, the synapse head sends out thin projections or \u2018filopodia\u2019 to greet them. In one particularly dramatic case \u2013 as seen in the accompanying image \u2013 fifteen synapse heads extended filopodia toward a single microglia as it picked on a synapse. \u201cAs we were trying to see how microglia eliminate synapses, we realised that microglia actually induce their growth most of the time,\u201d Laetitia Weinhard explains.<\/p>\n\n\n\n<p>It turns out that microglia might underly the formation of double synapses, where the terminal end of a neuron releases neurotransmitters onto two neighboring partners instead of one. This process can support effective connectivity between neurons. Weinhard: \u201cThis shows that microglia are broadly involved in structural plasticity and might induce the rearrangement of synapses, a mechanism underlying learning and memory.\u201d<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Perseverance<\/h2>\n\n\n\n<p>Since this was the first attempt to visualise this process in the brain, the current paper entails five years of technological development. The team tried three different state-of-the-art imaging systems before they succeeded. Finally, by combining correlative light and electron microscopy (CLEM) and light sheet fluorescence microscopy &#8211; a technique developed at EMBL &#8211; they were able to make the first movie of microglia eating synapses.<\/p>\n\n\n\n<p>\u201cThis is what neuroscientists fantasised about for years, but nobody had ever seen before,\u201d says Cornelius Gross. \u201cThese findings allow us to propose a mechanism for the role of microglia in the remodeling and evolution of brain circuits during development.\u201d In the future, he plans to investigate the role of microglia in brain development during adolescence and the possible link to the onset of schizophrenia and depression.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>For the first time, EMBL Rome researchers have captured microglia nibbling on brain synapses on film.<\/p>\n","protected":false},"author":58,"featured_media":12940,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2,17591],"tags":[595,597,371,598,594,67,592,1748,514,410,596],"embl_taxonomy":[],"class_list":["post-12938","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","category-science-technology","tag-brain","tag-clem","tag-gross","tag-imaging","tag-microglia","tag-neurobiology","tag-neuroscience","tag-press-release","tag-rome","tag-schwab","tag-synapse"],"acf":{"article_intro":"<p>For the first time, EMBL researchers have captured microglia nibbling on brain synapses. Their findings show that the special glial cells help synapses grow and rearrange, demonstrating the essential role of microglia in brain development. <em>Nature Communications<\/em> publishes the results on March 26.<\/p>\n","related_links":[{"link_description":"Research of the Gross group","link_url":"https:\/\/www.embl.it\/research\/unit\/gross\/"},{"link_description":"Research of the Schwab team","link_url":"https:\/\/www.embl.de\/research\/units\/cbb\/schwab\/index.html"}],"article_sources":[{"source_description":"<p>Weinhard, L., et al. Microglia remodel synapses by presynaptic trogocytosis and spine head filopodia induction. Nature Communications, published online 26 March.<br \/>\nDOI: 10.1038\/s41467-018-03566-5<\/p>\n","source_link_url":"https:\/\/www.nature.com\/articles\/s41467-018-03566-5"}],"vf_locked":false,"featured":false,"color":"#007B53","show_featured_image":false,"in_this_article":false,"youtube_url":"","mp4_url":"","video_caption":"","translations":false,"press_contact":"EMBL Generic"},"embl_taxonomy_terms":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Captured: microglia nibbling on brain synapses | EMBL<\/title>\n<meta name=\"description\" content=\"For the first time, EMBL researchers have captured microglia nibbling on brain synapses. Their findings show that the special glial cells help synapses grow and rearrange, demonstrating the essential role of microglia in brain development.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.embl.org\/news\/science\/captured-microglia-nibbling-on-brain-synapses\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Captured: microglia nibbling on brain synapses | EMBL\" \/>\n<meta property=\"og:description\" content=\"For the first time, EMBL researchers have captured microglia nibbling on brain synapses. Their findings show that the special glial cells help synapses grow and rearrange, demonstrating the essential role of microglia in brain development.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.embl.org\/news\/science\/captured-microglia-nibbling-on-brain-synapses\/\" \/>\n<meta property=\"og:site_name\" content=\"EMBL\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/embl.org\/\" \/>\n<meta property=\"article:published_time\" content=\"2018-03-26T09:00:15+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-23T21:02:34+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2018\/03\/Filopodia-ib.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"620\" \/>\n\t<meta property=\"og:image:height\" content=\"425\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Iris Kruijen\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@IrisKruijen\" \/>\n<meta name=\"twitter:site\" content=\"@embl\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Iris Kruijen\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"NewsArticle\",\"@id\":\"https:\/\/www.embl.org\/news\/science\/captured-microglia-nibbling-on-brain-synapses\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/captured-microglia-nibbling-on-brain-synapses\/\"},\"author\":{\"name\":\"Iris Kruijen\",\"@id\":\"https:\/\/www.embl.org\/news\/#\/schema\/person\/bdd9b4c648f9ed37311c369a20ac77e1\"},\"headline\":\"Captured: microglia nibbling on brain synapses\",\"datePublished\":\"2018-03-26T09:00:15+00:00\",\"dateModified\":\"2024-03-23T21:02:34+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/captured-microglia-nibbling-on-brain-synapses\/\"},\"wordCount\":422,\"publisher\":{\"@id\":\"https:\/\/www.embl.org\/news\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/captured-microglia-nibbling-on-brain-synapses\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2018\/03\/Filopodia-ib.jpg\",\"keywords\":[\"brain\",\"clem\",\"gross\",\"imaging\",\"microglia\",\"neurobiology\",\"neuroscience\",\"press release\",\"rome\",\"schwab\",\"synapse\"],\"articleSection\":[\"Science\",\"Science &amp; Technology\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.embl.org\/news\/science\/captured-microglia-nibbling-on-brain-synapses\/\",\"url\":\"https:\/\/www.embl.org\/news\/science\/captured-microglia-nibbling-on-brain-synapses\/\",\"name\":\"Captured: microglia nibbling on brain synapses | EMBL\",\"isPartOf\":{\"@id\":\"https:\/\/www.embl.org\/news\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/captured-microglia-nibbling-on-brain-synapses\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/captured-microglia-nibbling-on-brain-synapses\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2018\/03\/Filopodia-ib.jpg\",\"datePublished\":\"2018-03-26T09:00:15+00:00\",\"dateModified\":\"2024-03-23T21:02:34+00:00\",\"description\":\"For the first time, EMBL researchers have captured microglia nibbling on brain synapses. 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