A161 HEMOPEXIN TREATMENT ALLEVIATES COLITIS SEVERITY IN THE ABSENCE OF IL-22RA1 SIGNALING IN MICE
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Abstract Background Inflammatory bowel disease (IBD) is often defined by persistent intestinal epithelial inflammation, bleeding, and pain. It is one of the major risk factors for colorectal cancer (CRC). IBD’s pathogenesis is fundamentally characterized by the release of free luminal heme. Dietary heme induces intestinal dysbiosis and exacerbates colitis. Interleukin 22 (IL-22) is produced in the gut by immune cells, mainly innate lymphoid cell 3 (ILC3). It is known to induce a protective response mediated by hemopexin, a plasma heme scavenger produced in the liver that limits the availability of heme iron to microbes and suppresses bacterial growth. Aims To evaluate the protective role of IL-22 by the stimulation of hemopexin in a mouse model of acute colitis Methods To assess the effect of IL-22 on colitis, Il22ra1-/- and wild-type (Wt) mice on a C57BL/6 background were treated with 2.5% dextran sodium sulphate (DSS) in drinking water for 12 days to induce colitis, after which they were sacrificed. To reverse colitis severity with hemopexin, three groups of mice received 2.5% DSS in drinking water for 12 days. The treatment group (Il22ra1-/-) received an 15 mg/kg BW hemopexin injection intraperitoneally on day 7 of the DSS treatment, while the other two groups, Wt and Il22ra1-/-, received the vehicle (PBS). Results Il22ra1 -/- mice had significantly greater weight loss, higher disease activity index (DAI) score and shorter colon length on day 12 (endpoint) compared to the Wt mice. Significant increases in inflammatory markers such as lipocalin-2 (lcn-2), TNF-α and IL-6 were observed in Il22ra1-/- mice, contributing to their condition. Decreased fecal hemopexin and increased free luminal heme were observed in Il22ra1-/- mice compared to the Wt mice. Hemopexin administration reversed the disease severity by reducing DAI, inflammatory markers and increasing the colon length. Increased fecal hemopexin and reduced luminal heme were also observed in the Il22ra1-/- mice. Conclusions Hemopexin is present in the gut during colitis. The absence of Il-22ra1 enhances free luminal heme production, reduces hemopexin concentration in the gut, and aggravates colitis in mice. Hemopexin administration reduces free luminal heme in the gut, enhances hemopexin availability and alleviates colitis severity in mice. Funding Agencies CIHRUniversite de Montreal, CRCHUM, Institute du Cancer de Montreal
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it