{"id":10702,"date":"2017-09-21T12:24:48","date_gmt":"2017-09-21T10:24:48","guid":{"rendered":"https:\/\/news.embl.de\/?p=10702"},"modified":"2024-03-25T09:55:02","modified_gmt":"2024-03-25T08:55:02","slug":"fish-on-fire","status":"publish","type":"post","link":"https:\/\/www.embl.org\/news\/science\/fish-on-fire\/","title":{"rendered":"Fish on fire"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Walk us through what is happening in this video clip of ASC assembly<\/h3>\n\n\n\n<figure class=\"vf-figure wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"620\" height=\"349\" class=\"vf-figure__image\" src=\"https:\/\/news.embl.de\/wp-content\/uploads\/2017\/09\/Untitled-1.gif\" alt=\"\" class=\"wp-image-10737\"\/><\/figure>\n\n\n\n<p>Kuri: Inflammasomes are big multi-protein complexes that assemble when specialised molecules inside the cell detect damage. ASC is a protein that links these molecules with the next step in signalling by aggregating into a clump, which is called an ASC speck because of the way it appears under the microscope.<\/p>\n\n\n\n<p>To explore the effects of speck formation in the live fish, we inserted a copy of ASC into the zebrafish genome \u2013 one that enabled us to induce ASC expression, trigger speck formation in different cell types and study the consequences. Because we\u2019ve tagged ASC with a fluorescent protein, we can visualise this live throughout the entire organism.<\/p>\n\n\n\n<p>The process of speck assembly is basically a snowball effect \u2013 all of the available ASC protein in the cell clusters into the same huge aggregate. In this video of zebrafish skin, the ASC specks are red. Each cell forms a single speck, to which other proteins are recruited to initiate reactions that we show will ultimately result in cell death of skin cells. By labelling macrophages in green, we can visualise how these cellular garbage collectors come and clean up the cellular debris.<\/p>\n\n\n\n<p>Nicole Schieber, who is part of <a href=\"https:\/\/www.embl.de\/research\/units\/cbb\/schwab\/index.html\" target=\"_blank\" rel=\"noopener noreferrer\">Yannick Schwab\u2019s team<\/a> at EMBL, helped us look at the structure of specks using correlative light and electron microscopy. By combining images from light microscopy and electron microscopy, she was able to show what a speck formed <em>in vivo<\/em> [in a living organism] looked like in astonishingly fine detail, which confirmed and extended predictions that were made <em>in vitro <\/em>[in an artificial environment outside of the organism].<\/p>\n\n\n\n<figure class=\"vf-figure wp-block-image alignnone size-full wp-image-10730\"><img loading=\"lazy\" decoding=\"async\" width=\"620\" height=\"380\" class=\"vf-figure__image\" src=\"https:\/\/news.embl.de\/wp-content\/uploads\/2017\/09\/Fig5C.jpg\" alt=\"Combined images from light microscopy and electron microscopy reveal what a speck formed in vivo (in blue) looks like. IMAGE: EMBL\/Schwab Team\" class=\"wp-image-10730\" srcset=\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2017\/09\/Fig5C.jpg 620w, https:\/\/www.embl.org\/news\/wp-content\/uploads\/2017\/09\/Fig5C-300x184.jpg 300w\" sizes=\"auto, (max-width: 620px) 100vw, 620px\" \/><figcaption class=\"vf-figure__caption\">Combined images from light microscopy and electron microscopy reveal what a speck formed in vivo (in blue) looks like. IMAGE: EMBL\/Schwab Team<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">How else does your paper build on previous research?<\/h3>\n\n\n\n<p>Leptin: To visualise ASC inside a cell, previous cell culture experiments introduced an additional copy of the gene \u2013 in which a fluorescent label was attached to ASC \u2013 into the cell\u2019s genome. This means ASC can be seen, but it will be expressed at levels not originally determined by the genome. When we put proteins in cells and play around with them, that\u2019s not normal! Experiments looking at ASC speck formation in cells with naturally occurring levels of ASC have only been done in dead, stained cells. The advantage of our system is that we can visualise speck formation in real time with ASC levels that are found normally in the fish.<\/p>\n\n\n\n<blockquote class=\"vf-blockquote\"><p>The advantage of our system is that we can visualise speck formation in real time<\/p><\/blockquote>\n\n\n\n<p>Kuri: We achieved this by using CRISPR-Cas9, a powerful gene editing technology, to modify the zebrafish genome. With CRISPR, we can avoid introducing extra copies of the gene because we\u2019re able to modify the genome itself at specific spots. Here we seamlessly inserted a fluorescent label into the endogenous ASC gene. This means ASC is produced at normal levels with the fluorescent label attached. And you can see it live in the entire fish!<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How far would visualising ASC speck formation have applications for human health?<\/h3>\n\n\n\n<p>Leptin: There is a huge interface between inflammation and health. Inflammation, on one hand, is good. It alerts the body to danger and sends in professional cells to deal with it. On the other hand, it\u2019s what makes you feel bad, and it can go seriously wrong! Allergies and many diseases such as Alzheimer\u2019s are linked to inflammation when it is not kept in check and becomes chronic, which has also been linked to higher ASC speck numbers. Inflammatory systems have to be poised so that they quickly turn on when there is real danger, yet do not turn on spontaneously.<\/p>\n\n\n\n<p>Kuri: Inflammation is not just limited to immune cells \u2013 it can happen in tissues and cells that are not normally linked to the innate immune system. ASC is everywhere inside zebrafish, including the gut, gills and brain, but I was particularly interested in the skin cells of the animal, which come into contact with the outside world. This is why looking at an entire organism becomes relevant. Shedding light on how inflammation works in these tissues contributes to our understanding of how and why inflammation can go wrong.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>New study by Paola Kuri and Maria Leptin shows how inflammation happens in zebrafish in real time<\/p>\n","protected":false},"author":39,"featured_media":10717,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2,17591],"tags":[628,55,32,43,531,245],"embl_taxonomy":[],"class_list":["post-10702","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","category-science-technology","tag-crispr","tag-development","tag-health","tag-heidelberg","tag-leptin","tag-video"],"acf":{"article_intro":"<p>While immune sensing mechanisms vary widely between animals, ASC specks \u2013 particles that play a key role in triggering inflammation \u2013 form in humans as well as zebrafish. In a study published in <em>The Journal of Cell Biology<\/em>, Paola Kuri and <a href=\"https:\/\/www.embl.de\/research\/units\/directors_research\/leptin\/index.html\" target=\"_blank\" rel=\"noopener\">Maria Leptin<\/a> show how this process happens in zebrafish in real time<\/p>\n","related_links":[{"link_description":"Zebrafish earns its stripes for in vivo ASC speck dynamics","link_url":"http:\/\/jcb.rupress.org\/content\/early\/2017\/08\/14\/jcb.201708002?ct="},{"link_description":"Biosights: September 2017","link_url":"http:\/\/jcb.rupress.org\/sites\/default\/files\/biosights\/biosights_sep_04_2017.mp4"}],"article_sources":[{"source_description":"<p>Kuri P <em>et al. Journal of Cell Biology<\/em>, published online <span class=\"highwire-cite-metadata-doi highwire-cite-metadata\"><span class=\"highwire-cite-metadata-date highwire-cite-metadata\">July 12, 2017. DOI: <\/span><\/span><span class=\"highwire-cite-metadata-doi highwire-cite-metadata\"><span class=\"highwire-cite-metadata-date highwire-cite-metadata\">10.1083\/jcb.201703103. <\/span><\/span><\/p>\n","source_link_url":"http:\/\/dx.doi.org\/10.1083\/jcb.201703103"}],"vf_locked":false,"featured":false,"color":"#007B53","link_color":"#fff","show_featured_image":false,"in_this_article":false,"youtube_url":"","mp4_url":"","video_caption":"","press_contact":"None","translations":false},"embl_taxonomy_terms":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Fish on Fire | EMBL scientists&#039; new findings on inflammation<\/title>\n<meta name=\"description\" content=\"In a study published in The Journal of Cell Biology, Paola Kuri and Maria Leptin show how inflammation is triggered in zebrafish in real time\" \/>\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\/fish-on-fire\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fish on Fire | EMBL scientists&#039; new findings on inflammation\" \/>\n<meta property=\"og:description\" content=\"In a study published in The Journal of Cell Biology, Paola Kuri and Maria Leptin show how inflammation is triggered in zebrafish in real time\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.embl.org\/news\/science\/fish-on-fire\/\" \/>\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=\"2017-09-21T10:24:48+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-25T08:55:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2017\/09\/ASCwMacrophage.png\" \/>\n\t<meta property=\"og:image:width\" content=\"620\" \/>\n\t<meta property=\"og:image:height\" content=\"380\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Margaux Phares\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@mxphares\" \/>\n<meta name=\"twitter:site\" content=\"@embl\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Margaux Phares\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 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\/fish-on-fire\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/fish-on-fire\/\"},\"author\":{\"name\":\"Margaux Phares\",\"@id\":\"https:\/\/www.embl.org\/news\/#\/schema\/person\/d1fced3e1bf469536cf90385bd640f83\"},\"headline\":\"Fish on fire\",\"datePublished\":\"2017-09-21T10:24:48+00:00\",\"dateModified\":\"2024-03-25T08:55:02+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/fish-on-fire\/\"},\"wordCount\":719,\"publisher\":{\"@id\":\"https:\/\/www.embl.org\/news\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/fish-on-fire\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2017\/09\/ASCwMacrophage.png\",\"keywords\":[\"crispr\",\"development\",\"health\",\"heidelberg\",\"leptin\",\"video\"],\"articleSection\":[\"Science\",\"Science &amp; 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