{"id":30971,"date":"2025-10-22T16:13:42","date_gmt":"2025-10-22T16:13:42","guid":{"rendered":"https:\/\/www.tun.com\/home\/?p=30971"},"modified":"2025-10-22T16:13:43","modified_gmt":"2025-10-22T16:13:43","slug":"how-dangerous-e-coli-strain-eludes-guts-defense-mechanism-new-study","status":"publish","type":"post","link":"https:\/\/www.tun.com\/home\/how-dangerous-e-coli-strain-eludes-guts-defense-mechanism-new-study\/","title":{"rendered":"How Dangerous E. coli Strain Eludes Gut&#8217;s Defense Mechanism: New Study"},"content":{"rendered":"\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-uagb-blockquote uagb-block-e7eb3fc3 uagb-blockquote__skin-border uagb-blockquote__stack-img-none\"><blockquote class=\"uagb-blockquote\"><div class=\"uagb-blockquote__content\">A new study highlights how a virulent strain of E. coli bypasses the gut&#8217;s defense mechanism, potentially opening new avenues for treating infections and chronic gut issues.<\/div><footer><div class=\"uagb-blockquote__author-wrap uagb-blockquote__author-at-left\"><\/div><\/footer><\/blockquote><\/div>\n\n\n\n<div class=\"wp-block-group is-content-justification-space-between is-nowrap is-layout-flex wp-container-core-group-is-layout-0dfbf163 wp-block-group-is-layout-flex\"><div style=\"font-size:16px;\" class=\"has-text-align-left wp-block-post-author\"><div class=\"wp-block-post-author__content\"><p class=\"wp-block-post-author__name\">The University Network<\/p><\/div><\/div>\n\n\n<div class=\"wp-block-uagb-social-share uagb-social-share__outer-wrap uagb-social-share__layout-horizontal uagb-block-ee584a31\">\n<div class=\"wp-block-uagb-social-share-child uagb-ss-repeater uagb-ss__wrapper uagb-block-ec619ce7\"><span class=\"uagb-ss__link\" data-href=\"https:\/\/www.facebook.com\/sharer.php?u=\" tabindex=\"0\" role=\"button\" aria-label=\"facebook\"><span class=\"uagb-ss__source-wrap\"><span class=\"uagb-ss__source-icon\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256c0 123.8 90.69 226.4 209.3 245V327.7h-63V256h63v-54.64c0-62.15 37-96.48 93.67-96.48 27.14 0 55.52 4.84 55.52 4.84v61h-31.28c-30.8 0-40.41 19.12-40.41 38.73V256h68.78l-11 71.69h-57.78V501C413.3 482.4 504 379.8 504 256z\"><\/path><\/svg><\/span><\/span><\/span><\/div>\n\n\n\n<div class=\"wp-block-uagb-social-share-child uagb-ss-repeater uagb-ss__wrapper uagb-block-32d99934\"><span class=\"uagb-ss__link\" data-href=\"https:\/\/twitter.com\/share?url=\" tabindex=\"0\" role=\"button\" aria-label=\"twitter\"><span class=\"uagb-ss__source-wrap\"><span class=\"uagb-ss__source-icon\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M389.2 48h70.6L305.6 224.2 487 464H345L233.7 318.6 106.5 464H35.8L200.7 275.5 26.8 48H172.4L272.9 180.9 389.2 48zM364.4 421.8h39.1L151.1 88h-42L364.4 421.8z\"><\/path><\/svg><\/span><\/span><\/span><\/div>\n\n\n\n<div class=\"wp-block-uagb-social-share-child uagb-ss-repeater uagb-ss__wrapper uagb-block-1d136f14\"><span class=\"uagb-ss__link\" data-href=\"https:\/\/www.linkedin.com\/shareArticle?url=\" tabindex=\"0\" role=\"button\" aria-label=\"linkedin\"><span class=\"uagb-ss__source-wrap\"><span class=\"uagb-ss__source-icon\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 448 512\"><path d=\"M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3zM135.4 416H69V202.2h66.5V416zm-33.2-243c-21.3 0-38.5-17.3-38.5-38.5S80.9 96 102.2 96c21.2 0 38.5 17.3 38.5 38.5 0 21.3-17.2 38.5-38.5 38.5zm282.1 243h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9V416z\"><\/path><\/svg><\/span><\/span><\/span><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<p>In an alarming new discovery, researchers from Genentech and Oregon Health &amp; Science University (OHSU) have identified how a virulent strain of <em><em>E. coli<\/em><\/em>, known for causing bloody diarrhea, can circumvent the gut&#8217;s natural defense mechanism. <\/p>\n\n\n\n<p>The study, <a href=\"https:\/\/www.nature.com\/articles\/s41586-025-09645-0\" target=\"_blank\" rel=\"noopener\" title=\"\">published<\/a> today in the journal Nature, sheds light on how this dangerous strain of <em>E. coli<\/em> injects a protein called NleL into gut cells, breaking down crucial enzymes \u2014 ROCK1 and ROCK2 \u2014 necessary for the infected cells to be expelled from the intestinal lining. This enables the bacteria to spread more easily within the body.<\/p>\n\n\n\n<p>Typically, gut cells have robust mechanisms to expel infected cells quickly to halt infection. The intestinal lining, composed of tightly packed cells, acts as a first line of defense to keep harmful bacteria out of the bloodstream. If a cell gets infected, it sacrifices itself by pushing out into the intestines to be flushed away. <\/p>\n\n\n\n<p>This process is thwarted by the protein NleL, giving the bacteria a free pass to multiply.<\/p>\n\n\n\n<p>\u201cThis study shows that pathogenic bacteria can block infected cells from being pushed out,\u201d senior author Isabella Rauch, an associate professor of molecular microbiology and immunology in the OHSU School of Medicine, said in a news release. &#8220;It\u2019s a completely different strategy from what we\u2019ve seen before. Some bacteria try to hide from being detected, but this one actually stops the cell\u2019s escape route.\u201d<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Opening Path to New Treatments<\/h2>\n\n\n\n<p>Rauch&#8217;s expertise lies in understanding the complex interactions between the gut lining and microbial invaders. Her work is particularly significant for tackling both infectious diseases and chronic conditions like inflammatory bowel disease (IBD).<\/p>\n\n\n\n<p>\u201cWe now know that the gut lining isn\u2019t just a passive wall,\u201d Rauch added. \u201cThese cells are really good at detecting infection early and responding to it before the immune system even kicks in.\u201d<\/p>\n\n\n\n<p>The study was a collaborative effort involving biochemical experts from Genentech and Rauch&#8217;s team at OHSU. Together, they demonstrated that the <em>E. coli<\/em> strain carrying the NleL protein is far more effective at infecting the gut by preventing the swift expulsion of infected cells.<\/p>\n\n\n\n<p>\u201cWe were able to show that when the bacteria carry this certain protein, they infect the intestine much better,\u201d added Rauch. \u201cThey prevent the infected cells from being kicked out rapidly, which gives them more time to multiply and infect more cells.\u201d<\/p>\n\n\n\n<p>This insight opens the door to novel treatments targeting bacterial mechanisms rather than killing bacteria outright, as conventional antibiotics do.<\/p>\n\n\n\n<p>\u201cBy understanding how bacteria bypass our body\u2019s defenses, scientists could design anti-virulence therapies that don\u2019t rely on antibiotics,\u201d Rauch added. \u201cThat\u2019s really important, especially as antibiotic resistance continues to rise.\u201d<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A Global Health Concern<\/h2>\n\n\n\n<p>The implications of this study are far-reaching. This <em>E. coli<\/em> strain poses a high risk, particularly to young children who are more vulnerable to dehydration caused by diarrhea. Moreover, climate change and weakened food safety systems could exacerbate the prevalence of such infections.<\/p>\n\n\n\n<p>\u201cThese kinds of bacteria are already a serious problem in places with poor sanitation,\u201d Rauch added. \u201cBut with rising temperatures and cutbacks in food safety monitoring, they\u2019re becoming a growing threat in developed countries too.\u201d<\/p>\n\n\n\n<p>The findings also offer valuable insights into gut disorders, including IBD and gastrointestinal cancers. Understanding the cell extrusion process could illuminate how the gut maintains its defense while offering clues about what goes wrong in diseases when the gut lining sheds too frequently.<\/p>\n\n\n\n<p>\u201cThis cell \u2018extrusion\u2019 process happens in healthy guts all the time at a low level,\u201d added Rauch. \u201cBut in IBD, it ramps up, and we don\u2019t fully understand why. Similarly, we also see this in gastrointestinal cancers. This research gives us more insight into both sides of the equation, both how the body protects itself and how things go wrong.\u201d<\/p>\n\n\n\n<div style=\"height:12px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>Source:<\/strong> <a href=\"https:\/\/news.ohsu.edu\/2025\/10\/22\/study-dangerous-e-coli-strain-blocks-guts-defense-mechanism-to-spread-infection\" target=\"_blank\" rel=\"noopener\" title=\"\">Oregon Health &amp; Science University<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In an alarming new discovery, researchers from Genentech and Oregon Health &amp; Science University (OHSU) have identified how a virulent strain of E. coli, known for causing bloody diarrhea, can circumvent the gut&#8217;s natural defense mechanism. The study, published today in the journal Nature, sheds light on how this dangerous strain of E. coli injects [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"single-no-separators","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[12],"tags":[387],"class_list":["post-30971","post","type-post","status-publish","format-standard","hentry","category-health","tag-oregon-health-science-university"],"acf":[],"aioseo_notices":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false},"uagb_author_info":{"display_name":"The University Network","author_link":"https:\/\/www.tun.com\/home\/author\/funky_junkie\/"},"uagb_comment_info":0,"uagb_excerpt":"In an alarming new discovery, researchers from Genentech and Oregon Health &amp; Science University (OHSU) have identified how a virulent strain of E. coli, known for causing bloody diarrhea, can circumvent the gut&#8217;s natural defense mechanism. The study, published today in the journal Nature, sheds light on how this dangerous strain of E. coli injects&hellip;","_links":{"self":[{"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/posts\/30971","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/comments?post=30971"}],"version-history":[{"count":24,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/posts\/30971\/revisions"}],"predecessor-version":[{"id":31022,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/posts\/30971\/revisions\/31022"}],"wp:attachment":[{"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/media?parent=30971"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/categories?post=30971"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/tags?post=30971"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}