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DNBS/TNBS Colitis Models: Providing Insights Into Inflammatory Bowel Disease and Effects of Dietary Fat
Published on: February 27, 2014
Inhibiting microRNA-7 Expression Exhibited a Protective Effect on Intestinal Mucosal Injury in TNBS-Induced
Jing Guo1, Li-Juan Yang2, Mei Sun1
1Department of Pediatrics, Shengjing Hospital of China Medical University, 36 Sanhao Street, Shenyang, 110004, Liaoning, People's Republic of China.
Abstract:
This study aimed to explore the expression and correlation of microRNA-7 (miR-7) and trefoil factor 3 (TFF3) genes and proteins in inflammatory bowel disease (IBD) mouse models and to elucidate the effect of miR-7 inhibition in the intestinal mucosa in IBD models. A TNBS-induced IBD mouse model was established. Changes in intestinal inflammation were observed by HE staining, and the expression levels of miR-7 and TFF3 were detected by RT-PCR. After miRNA-antagomir injection, the degree of colonic tissue damage and the expression levels of miR-7 and TFF3 in intestinal tissues were compared. TNBS-induced IBD mice showed significant weight loss, significantly decreased disease activity index (DAI), and a significantly increased pathological damage score. miR-7 was highly expressed in the colon tissue of IBD mice, and TFF3 was downregulated. Inhibition of the expression of miR-7 improved the stool characteristics and fecal occult blood (OB) of IBD mice, significantly increased the expression of TFF3 protein, and decreased the pathological damage scores. In the IBD mouse model, miR-7 posttranscriptionally regulates TFF3. The inhibition of miR-7 expression improves some clinical manifestations of IBD mice, reduces the pathological damage of the intestinal mucosa, and shows a protective effect in IBD.
Insights
MicroRNA-7 (miR-7) is highly expressed in inflammatory bowel disease (IBD) and downregulates trefoil factor 3 (TFF3). Inhibiting miR-7 in IBD mouse models improved gut health and reduced intestinal damage.
Area of Science:
- Gastroenterology
- Molecular Biology
- Immunology
Background:
- Inflammatory bowel disease (IBD) is a chronic condition affecting the gastrointestinal tract.
- MicroRNAs play a role in regulating gene expression in various diseases, including IBD.
- Trefoil factor 3 (TFF3) is implicated in mucosal healing and protection.
Purpose of the Study:
- To investigate the expression of microRNA-7 (miR-7) and trefoil factor 3 (TFF3) in IBD.
- To determine the correlation between miR-7 and TFF3 in IBD pathogenesis.
- To evaluate the therapeutic potential of inhibiting miR-7 in an IBD mouse model.
Main Methods:
- Established a TNBS-induced IBD mouse model.
- Assessed intestinal inflammation via HE staining and quantified gene/protein expression using RT-PCR.
- Administered miRNA-antagomir to inhibit miR-7 and evaluated therapeutic effects.
Main Results:
- IBD mice exhibited weight loss, increased disease activity index (DAI), and heightened pathological damage scores.
- miR-7 was upregulated, while TFF3 was downregulated in the colons of IBD mice.
- Inhibition of miR-7 ameliorated IBD symptoms, increased TFF3 protein levels, and reduced colonic tissue damage.
Conclusions:
- miR-7 posttranscriptionally regulates TFF3 in the context of IBD.
- Inhibiting miR-7 demonstrates a protective effect in IBD mouse models.
- Targeting miR-7 may offer a novel therapeutic strategy for IBD treatment.
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