A165 IL-6 ENHANCES THE ANTI-COLITIC THERAPEUTIC POTENTIAL OF HUMAN IL-4 POLARIZED MACROPHAGES
Notice bibliographique
Résumé
Abstract Background Inflammatory bowel disease (IBD) is a group of inflammatory disorders, including Crohn’s disease and ulcerative colitis, that affect the gastrointestinal tract and can significantly impact patients’ quality of life. Forty percent of individuals with IBD are unresponsive to current therapies and a cure remains elusive. Macrophages play key roles in inflammation and tissue repair, with IL-4 treated macrophages, M(IL4)s, exerting an anti-inflammatory effect. We showed that systemic administration of human M(IL4)s reduced disease severity in murine colitis. Interleukin-6 is considered a pro-inflammatory cytokine, the levels of which are increased in IBD gut tissue. Murine studies suggest IL-6 may reinforce an M(IL4) phenotype, raising the possibility, and perhaps challenging dogma, that IL-6 could promote the beneficial effects of M(IL4)s. Therefore, I hypothesize that local tissue signal IL-6 enhances the anti-inflammatory properties of human M(IL4)s. Aims 1. Determine the effect of IL-6 on the phenotype of human M(IL4)s. 2. Determine the effect of IL-6 on M(IL4) function, assessing (a) wound healing capacity and (b) cell death. 3. Compare the efficacy of M(IL4) and M(IL4+IL6) in the DNBS-rag1-/- mouse colitis. Methods M(IL4)s were differentiated from blood monocytes from male and female healthy volunteers and individuals with Crohn’s disease. M(IL4)s ± IL-6 (10 ng/mL; 24h) were assessed for (1) phenotype (mRNA expression) and (2) function. Function was evaluated through testing (a) conditioned medium from M(IL4+IL6)s in an in vitro Caco2 epithelial scratch-wound assay and (b) viability in response to hydrogen peroxide (H2O2) (oxidative stress) via LDH release. (3) M(IL4)s or M(IL4+IL6)s were delivered intraperitoneally (106 cells) and 48h later, rag1-/- mice received 5mg intra-rectal DNBS. Colitis was assessed 72h later. Non-treated M(0) and M(IL6) serve as controls. Results M(IL4)s and M(IL4+IL6)s show similar increased expression of CD206 and CCL18, and decreased CD14 mRNA (n=6-7). Conditioned media from both M(IL4)s and M(IL4+IL6)s promoted a similar degree of epithelial migration in the wound healing assay (n=5). Macrophages from patients had increased susceptibility to H2O2-induced death, which was reduced in the M(IL4+IL6) group (n=6 healthy donors; n=6 Crohn’s). M(IL4+IL6)s were more effective than M(IL4)s in protecting against murine colitis as determined by body weight, colon length and a macroscopic disease score (n=8 mice, 3 exps.). Conclusions IL-6 does not abrogate the M(IL4) phenotype or wound healing capacity and protects the cell from H2O2-induced cytotoxicity. Also, M(IL4+IL6)s have a superior anti-colitic effect when compared to M(IL4)s from the same donor. The data support macrophage transfer to treat colitis and indicate that an element of an inflamed environment can enhance the anti-colitic effect of human M(IL4)s. Funding Agencies CIHRCartier Family Student Research Award in Gastroenterology and Hepatology, Alberta Graduate Excellence Scholarship, Helmsley Grant
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,003 | 0,001 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».