{"id":34894,"date":"2026-03-05T14:53:00","date_gmt":"2026-03-05T14:53:00","guid":{"rendered":"https:\/\/www.tun.com\/home\/?p=34894"},"modified":"2026-03-08T23:25:29","modified_gmt":"2026-03-08T23:25:29","slug":"pitt-scientists-create-living-eye-drop-to-speed-cornea-healing","status":"publish","type":"post","link":"https:\/\/www.tun.com\/home\/pitt-scientists-create-living-eye-drop-to-speed-cornea-healing\/","title":{"rendered":"Pitt Scientists Create \u2018Living Eye Drop\u2019 to Speed Cornea Healing"},"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\">University of Pittsburgh scientists have turned a harmless eye-dwelling bacterium into a \u201cliving eye drop\u201d that speeds corneal healing in mice. The early-stage work hints at future one-time treatments that could protect and repair the eye from within.<\/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>A team of University of Pittsburgh School of Medicine scientists has engineered a \u201cliving eye drop\u201d that helps the surface of the eye heal itself, pointing toward a future where a single treatment could protect and repair vision for the long term.<\/p>\n\n\n\n<p>In an early-stage study in mice, researchers turned a harmless bacterium that naturally lives under the eyelid into a tiny drug factory. The microbe was reprogrammed to release an anti-inflammatory molecule that sped up healing after corneal injury, according to findings <a href=\"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S2211124726001427\" title=\"\">published<\/a> in <em>Cell Reports<\/em>.<\/p>\n\n\n\n<p>Senior author Anthony St. Leger, an associate professor of ophthalmology and immunology at Pitt and the UPMC Vision Institute, noted the work marks a turning point in how scientists think about treating eye disease.<\/p>\n\n\n\n<p>\u201cThis is the first demonstration that a microbe that lives on the ocular surface could be engineered to deliver a therapeutic that improves eye health,\u201d St. Leger said in a news release. \u201cIt opens the door to the idea of \u2018living medicine\u2019 for the eye\u2014something you apply once, and it stays, protects and helps the tissue heal.\u201d<\/p>\n\n\n\n<p>The cornea \u2014 the clear, dome-shaped surface at the front of the eye \u2014 is essential for sharp vision. It is also vulnerable. Everyday scratches from contact lenses, dry eye, infections or trauma can be painful and, in severe cases, threaten sight. Current treatments often rely on eye drops that must be applied several times a day because tears quickly wash medications away.<\/p>\n\n\n\n<p>That constant rinsing makes it hard to keep drugs on the eye long enough to do their job. Patients may struggle to stick to frequent dosing schedules, and even when they do, the medicine does not stay put for long.<\/p>\n\n\n\n<p>To get around this problem, the Pitt team focused on <em>Corynebacterium mastitidis<\/em>, a benign bacterium that naturally colonizes the eye. Instead of adding more and more drug from the outside, they asked whether they could turn this resident microbe into a built-in delivery system.<\/p>\n\n\n\n<p>Using genetic engineering, the researchers modified <em>C. mastitidis<\/em> so it continuously secreted interleukin-10, or IL-10, a small protein that helps regulate inflammation. In a mouse model, the scientists gently scratched the cornea to mimic injury, then treated the eyes with either the engineered bacteria, unmodified bacteria or a simple saline solution.<\/p>\n\n\n\n<p>Mice that received the IL-10\u2013secreting microbes healed faster than those given regular bacteria or saline. When the team blocked the receptor that IL-10 uses to signal, the healing benefit disappeared. That result showed the effect depended on IL-10 and not just on the presence of bacteria.<\/p>\n\n\n\n<p>To begin exploring whether the approach might one day work in people, the researchers also built a version of the microbe that releases human IL-10. In lab experiments, that engineered strain improved wound closure in cultured human corneal cells and reduced inflammatory signaling in human immune cells. Those tests are only an early indication, but they suggest the strategy could potentially be adapted for human use with further development.<\/p>\n\n\n\n<p>Beyond IL-10, St. Leger and colleagues designed their system to be flexible.<\/p>\n\n\n\n<p>\u201cWhat makes this exciting is that the system is modular,\u201d St. Leger added. \u201cWe built it so you can swap in different genes\u2014different cytokines, growth factors or other proteins\u2014to tailor the therapy to specific eye diseases.\u201d<\/p>\n\n\n\n<p>That modular design raises the possibility of custom \u201cliving medicines\u201d for a range of conditions that affect the ocular surface, from severe dry eye and inflammatory disorders to traumatic injuries. Instead of repeated drops or injections, a single application of engineered microbes might one day provide a steady, long-lasting supply of helpful molecules right where they are needed.<\/p>\n\n\n\n<p>The concept fits into a broader movement in medicine toward live biotherapeutics \u2014 living cells or microbes that deliver treatment from within the body. Similar strategies are being explored for gut, skin and cancer therapies. The eye, with its delicate tissues and constant tear flow, presents unique challenges but also a clear need for more durable treatments.<\/p>\n\n\n\n<p>The researchers stress that their work is still at an early, proof-of-concept stage. Before any clinical trials in people, they will need to show that the engineered bacteria are safe, stable and controllable over time.<\/p>\n\n\n\n<p>One key priority is building in reliable ways to turn the microbes off when they are no longer needed. The team notes that future versions will likely need genetic \u201coff switches,\u201d along with methods to remove or deactivate the bacteria on demand.<\/p>\n\n\n\n<p>Regulatory testing, manufacturing standards and careful studies in larger animal models would also be required before the approach could move toward human patients.<\/p>\n\n\n\n<p>Still, for the scientists behind the project, seeing their engineered microbe actually improve healing in a living system was a powerful moment.<\/p>\n\n\n\n<p>\u201cIn my lab, we don\u2019t typically build tools from the ground up,\u201d added St. Leger. \u201cSeeing a measurable improvement in healing in an animal model using something we engineered was incredibly rewarding, and it points us toward intriguing possibilities for future research.\u201d<\/p>\n\n\n\n<p>The study was led by Jackie Shane, with contributions from Matthew Evans, Yannis Rigas and Robert Shanks, all of Pitt. Their work lays a foundation for future efforts to harness the eye\u2019s own microscopic residents as partners in protecting sight. <\/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:\/\/www.medschool.pitt.edu\/news\/pitt-scientists-engineer-living-eye-drop-support-corneal-healing\" target=\"_blank\" rel=\"noopener\" title=\"\">University of Pittsburgh School of Medicine<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>University of Pittsburgh scientists have turned a harmless eye-dwelling bacterium into a \u201cliving eye drop\u201d that speeds corneal healing in mice. The early-stage work hints at future one-time treatments that could protect and repair the eye from within.<\/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":[25],"tags":[485],"class_list":["post-34894","post","type-post","status-publish","format-standard","hentry","category-science","tag-university-of-pittsburgh-school-of-medicine"],"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":"University of Pittsburgh scientists have turned a harmless eye-dwelling bacterium into a \u201cliving eye drop\u201d that speeds corneal healing in mice. The early-stage work hints at future one-time treatments that could protect and repair the eye from within.","_links":{"self":[{"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/posts\/34894","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=34894"}],"version-history":[{"count":4,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/posts\/34894\/revisions"}],"predecessor-version":[{"id":34910,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/posts\/34894\/revisions\/34910"}],"wp:attachment":[{"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/media?parent=34894"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/categories?post=34894"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/tags?post=34894"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}