{"id":25384,"date":"2026-10-29T08:45:13","date_gmt":"2026-10-29T08:45:13","guid":{"rendered":"https:\/\/www.drfz.de\/?p=25384"},"modified":"2026-10-29T08:47:21","modified_gmt":"2026-10-29T08:47:21","slug":"when-interleukin-33-protects-and-when-it-becomes-harmful","status":"publish","type":"post","link":"https:\/\/www.drfz.de\/en\/neuigkeiten\/when-interleukin-33-protects-and-when-it-becomes-harmful\/","title":{"rendered":"When interleukin-33 protects and when it becomes harmful"},"content":{"rendered":"\n<p class=\"alignwide wp-block-paragraph\"><strong>In a review article, Dr. Sebastian Serve and Prof. Max L\u00f6hning of the German Rheumatology Research Center (DRFZ), a Leibniz Institute, and Charit\u00e9 \u2013 Universit\u00e4tsmedizin Berlin explain why the body\u2019s own alarm signal, interleukin-33 (IL-33) protects against infections and promotes tissue healing in some situations, but under other circumstances promotes diseases such as allergies, chronic inflammation, and tumor growth. According to the authors, the key factors are the quantity, location, and timing of IL-33 release, as well as the cells that detect this signal. Based on these findings, the authors conclude that future therapies targeting this signaling molecule could be more precisely tailored. The study was published in the journal <em>Nature Reviews Immunology<\/em>.<\/strong><\/p>\n\n\n\n<p class=\"alignwide wp-block-paragraph\">IL-33 is produced primarily in the skin, lungs, intestines, and blood vessels and is stored in the cell nucleus. When these cells are damaged, IL-33 is released and alerts the immune system via its receptor. IL-33 is a particularly potent signal: after its release, enzymes from inflammatory cells can modify it in such a way that its effect is up to thirty times stronger. To prevent any harm from resulting, its release and effect are strictly regulated by biological mechanisms<strong>.<\/strong><\/p>\n\n\n\n<p class=\"alignwide wp-block-paragraph\">The authors describe how IL-33 can have opposing effects. In tumors, it activates the immune system\u2019s killer cells, but it also promotes cells that suppress the immune response. It acts in a similarly dual role in viral infections, rheumatic diseases, and chronic inflammatory bowel diseases.<\/p>\n\n\n\n<p class=\"alignwide wp-block-paragraph\">The authors provide an explanatory framework for these contrasting effects: It depends on which cells carry the receptor for the alarm signal. Immune cells that suppress inflammation and repair tissue carry it permanently, thereby capturing small amounts of the alarm signal and using it to promote their activity. Other immune cells, which fight viruses and tumor cells but can also damage healthy tissue in the process, express it only temporarily and at a lower density. Therefore, larger amounts of the alarm signal are required to activate them. Many of the contradictory findings in the literature can be interpreted in this way: They do not describe the same process with different outcomes, but rather different cells, tissues, and time points.<\/p>\n\n\n\n<p class=\"alignwide wp-block-paragraph\">\u201cIL-33 is neither a strictly inflammatory nor a strictly healing signal,\u201d explain the authors of the review article. \u201cWhether it is beneficial or harmful depends on how much of it is released, in which tissue this occurs, and which immune cells are present at the site and express the receptor. Therefore, in many diseases, it is not enough to simply turn the signal on or off.\u201d<\/p>\n\n\n\n<p class=\"alignwide wp-block-paragraph\">This has direct implications for new therapies. Several antibodies targeting IL-33 or its receptor are currently being tested in clinical trials; the results vary depending on the disease and the study. The authors see two possible reasons for this: The approaches used so far inhibit the signaling pathway throughout the entire body, thereby suppressing both disease-promoting and protective effects at the same time. In addition, the timing of treatment could be crucial. While inhibition may be beneficial during harmful inflammation, the same treatment could impair healing during the transition to necessary tissue repair.<\/p>\n\n\n\n  <section id=\"original-publication\" class=\"section links-list  alignwide  toc-item\">\n    <div class=\"container container--center\">\n                        <h2 class=\"section__heading launimation slideBottom\">Publication<\/h2>\n        \n              \n      <div class=\"links-list__items-wrap\">\n        \n<div class=\"links-list__items links-list__items--row \">\n      <div class=\"links-list__item  launimation slideBottom\">\n      \n      <a href=\"https:\/\/rdcu.be\/KrY2rmiUnvVa\" target=\"_self\" class=\"h6 links-list__item-title\">Serve, S., L\u00f6hning, M. Interleukin-33 and its receptor: multifaceted roles and emerging therapeutic potential. Nat Rev Immunol (2026); doi.org\/10.1038\/s41577-026-01345-8<\/a>\n\n      \n      <a href=\"https:\/\/rdcu.be\/KrY2rmiUnvVa\" target=\"_self\" class=\"links-list__item-link\">\n        <span class=\"button button--arrow button--arrow-nw button--arrow-link\" ><\/span>\n      <\/a>\n    <\/div>\n  <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n\n\n\n  <section id=\"responsible-pi\"    class=\"section grid-heads alignwide toc-item\">\n    <div class=\"container container--center\">\n              <div class=\"grid-heads__header\">\n                      <h2 class=\"section__heading launimation slideBottom\">Project leader<\/h2>\n          \n                  <\/div>\n      \n              <div class=\"grid-heads__items grid grid--4\">\n          \n<article\n  id=\"post-2261\" class=\"teaser-head launimation slideBottom  post-2261 head type-head status-publish has-post-thumbnail hentry department-pb-3-systemrheumatologie liaison-charite-rheumatololgie-und-klinische-immunologie programme-area-tax-programmbereich-3 working-group-function-gruppenleitung working-group-tax-pitzer-labor-fuer-arthroseforschung\">\n  <div class=\"teaser-head__image\">\n          <img decoding=\"async\" loading=\"lazy\" sizes=\"auto, 520px\" src=\"https:\/\/www.drfz.de\/wp-content\/uploads\/2024\/12\/Loehning_Max-150x100.jpg\" data-src=\"https:\/\/www.drfz.de\/wp-content\/uploads\/2024\/12\/Loehning_Max-1024x684.jpg\" data-srcset=\"https:\/\/www.drfz.de\/wp-content\/uploads\/2024\/12\/Loehning_Max-1920x1282.jpg 1920w, https:\/\/www.drfz.de\/wp-content\/uploads\/2024\/12\/Loehning_Max-1600x1068.jpg 1600w, https:\/\/www.drfz.de\/wp-content\/uploads\/2024\/12\/Loehning_Max-1366x912.jpg 1366w, https:\/\/www.drfz.de\/wp-content\/uploads\/2024\/12\/Loehning_Max-1024x684.jpg 1024w, https:\/\/www.drfz.de\/wp-content\/uploads\/2024\/12\/Loehning_Max-768x513.jpg 768w, https:\/\/www.drfz.de\/wp-content\/uploads\/2024\/12\/Loehning_Max-550x367.jpg 550w\" class=\"image image--landscape\" alt=\"\"  width=\"1024\"  height=\"684\">      <\/div>\n  <div class=\"teaser-head__header\">\n    <!--    -->    <!--      -->    <!--    -->    <h2 class=\"h6 teaser-head__title launimation slideBottom\">Prof. Dr. Max L\u00f6hning<\/h2>\n          <div class=\"teaser-head__role\">\n                                  <p class=\"text-label working_group_function working_group\">\n            Gruppenleitung: Pitzer-Labor f\u00fcr Arthroseforschung          <\/p>\n                          <p\n            class=\"text-label liaison\">Liaison working group with Charit\u00e9 &#8211; Rheumatologie und Klinische Immunologie<\/p>\n              <\/div>\n      <\/div>\n\n      <div class=\"teaser-head__contact\">\n              <p class=\"text-label\"><a href=\"mailto:loehning@drfz.de\"\">loehning@drfz.de<\/a><\/p>\n          <\/div>\n    <a href=\"https:\/\/www.drfz.de\/koepfe\/prof-dr-max-loehning\/\"\n    aria-describedby=\"post-2261\"\n    title=\"Gehe zum Beitrag\" rel=\"bookmark\"\n    class=\"teaser-head__link button button--small button--arrow button--arrow-link\"><span\n      class=\"visually-hidden\">Prof. Dr. Max L\u00f6hning<\/span><\/a>\n<\/article>        <\/div>\n          <\/div>\n  <\/section>\n\n\n\n<p class=\"alignwide wp-block-paragraph\">Figure: <strong>Different regulation of the IL-33 receptor ST2 on cells of type 1 (left) and type 2 immunity (right).<\/strong> Depending on the immune cell type, the expression of the IL-33 receptor ST2 is regulated differently. As a result, IL-33 can have distinct effects in different immune responses \u2014 for example, promoting or limiting inflammation. (Figure 3 of the article reproduced with permission from Springer Nature).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In a review article, Dr. Sebastian Serve and Prof. Max L\u00f6hning of the German Rheumatology Research Center (DRFZ), a Leibniz Institute, and Charit\u00e9 \u2013 Universit\u00e4tsmedizin\u2026<\/p>\n","protected":false},"author":4,"featured_media":25385,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[292,291],"tags":[472,425,496],"programme-area-tax":[181],"working-group-tax":[256],"class_list":["post-25384","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-en","category-publications","tag-loehning","tag-pitzer-lab-of-osteoarthritis-research","tag-program-area-3","programme-area-tax-programme-area-3","working-group-tax-pitzer-laboratory-of-osteoarthritis-research-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>When interleukin-33 protects and when it becomes harmful - DRFZ<\/title>\n<meta name=\"description\" content=\"In a review published in Nature Immunology, Max L\u00f6hning and 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