---
title: "Mesaconic acid (MES) delivery to the gut reduces inflammation in Crohn’s disease mouse models"
id: "biorxiv-6-mesaconic-acid-delivery-via-biomaterials-and-engineered-probiotics-to-the-gut"
canonical_url: "https://medichelpline.com/clinical-feed/biorxiv-6-mesaconic-acid-delivery-via-biomaterials-and-engineered-probiotics-to-the-gut"
content_type: "clinical_feed_article"
specialty: "Gastroenterology"
source_name: "bioRxiv (Biomedical Preprints)"
source_url: "https://www.biorxiv.org/content/10.64898/2026.10.01.756006v1?rss=1"
published_at: "2026-10-07T12:00:00.000Z"
evidence_level: "Verified Feed"
license: "CC-BY-NC-4.0 / Informational Use"
---
# Mesaconic acid (MES) delivery to the gut reduces inflammation in Crohn’s disease mouse models
## Provenance & Clinical Metadata
- **Canonical URL:** https://medichelpline.com/clinical-feed/biorxiv-6-mesaconic-acid-delivery-via-biomaterials-and-engineered-probiotics-to-the-gut
- **Specialty:** [Gastroenterology](https://medichelpline.com/clinical-feed/gastroenterology.md)
- **Primary Source:** bioRxiv (Biomedical Preprints)
- **Source URL:** [Original Journal Publication](https://www.biorxiv.org/content/10.64898/2026.10.01.756006v1?rss=1)
- **Published At:** 2026-10-07T12:00:00.000Z
- **Evidence Rating:** Verified Feed
## Executive GIST (TL;DR)
- Mesaconate (MES) is an **immunosuppressive metabolite** found elevated in stool from Crohn’s disease (CD) patients but at levels below reported therapeutic concentrations. - High colonic absorption of MES limits its local retention in the colon, reducing therapeutic potential when delivered systemically or orally without modification. - The authors developed two local-delivery strategies to elevate gut MES: an engineered probiotic EcN-CAD and a Zinc–MES ionically crosslinked biomaterial (MES+Zn). - EcN-CAD is Escherichia coli Nissle 1917 engineered to overexpress cis-aconitate decarboxylase (CAD), producing itaconate that is converted to MES in situ. - MES+Zn is a Zn–MES formulation that uses ionic crosslinking to retain MES in the colon and sustain local levels. - Mechanistic studies indicate **MES alters T cell metabolism**, downregulating both glycolytic and mitochondrial activity and reducing expression of the transcription factor **RORγt**. - In preclinical models, MES+Zn decreased gut permeability and reduced myeloperoxidase (MPO) levels by ~1,000-fold compared to controls. - EcN-CAD decreased RORγt expression in CD4+ and CD8+ T cells, reduced gut permeability, and reduced inflammation in both preventive SAMP1/YitFC and SAMP1/YitFC dexamethasone-withdrawal models. - MES delivery technologies that elevate colonic MES can rewire T cell responses and show potential as therapies for gut-related inflammatory diseases such as Crohn’s disease. - The source article reports preclinical mouse-model data; clinical efficacy and safety in humans were not reported in the source.
## Clinical Analysis & Structured Key Points
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Huikang Qian 1 Case Western Reserve University; * [Find this author on Google Scholar](https://www.biorxiv.org/lookup/google-scholar?link_type=googlescholar&gs_type=author&author%5B0%5D=Huikang%2BQian%2B "Open in new tab") * [Find this author on PubMed](https://www.biorxiv.org/lookup/external-ref?access_num=Qian%20H&link_type=AUTHORSEARCH "Open in new tab") * [Search for this author on this site](https://www.biorxiv.org/search/author1%3AHuikang%2BQian%2B) * [ORCID record for Huikang Qian](http://orcid.org/0000-0002-4502-196X "Open in new tab") Drishtant Singh 1 Case Western Reserve University; * [Find this author on Google Scholar](https://www.biorxiv.org/lookup/google-scholar?link_type=googlescholar&gs_type=author&author%5B0%5D=Drishtant%2BSingh%2B "Open in new tab") * [Find this author on PubMed](https://www.biorxiv.org/lookup/external-ref?access_num=Singh%20D&link_type=AUTHORSEARCH "Open in new tab") * [Search for this author on this site](https://www.biorxiv.org/search/author1%3ADrishtant%2BSingh%2B) Zixuan Chen 1 Case Western Reserve University; 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However, colonic MES level is difficult to maintain because of its high absorption rate, limiting its therapeutic potential for CD. Herein, we developed two strategies that elevate MES level and suppress inflammation: EcN-CAD, an engineered probiotic Escherichia coli Nissle 1917 (EcN) that overexpresses cis-aconitate decarboxylase (CAD, produces itaconic acid that is converted to MES); and MES+Zn, a Zinc-MES ionically crosslinked formulation. Mechanistically, MES modulates T cell function by downregulating glycolytic and mitochondrial activity and decrease RORγt expression. In preclinical SAMP1/YitFC dexamethasone-withdrawa
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