Related Experiment Video
Updated: Aug 5, 2026
08:15
Network Pharmacology and Validation of the Antidepressant Mechanisms of Qiangzhifang in a Chronic Restraint Stress-induced Depression Rat Model
Published on: June 6, 2025
Antidepressant Effects of 3-Indolepropionic Acid by Regulating Inflammation Level via Short-Chain Fatty Acids
Jing Xie1,2,3, Jiaju Zhong4, Yongzhi Zhang5
1Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, 400016 Chongqing, China.
Frontiers in Bioscience (Landmark Edition)
|July 30, 2026
Summary
3-indolepropionic acid (IPA), a gut metabolite, shows antidepressant effects by improving gut microbiota and reducing brain inflammation. IPA treatment in mice with depression-like behaviors restored gut bacteria and boosted short-chain fatty acids (SCFAs).
Area of Science:
- Neuroscience
- Microbiology
- Pharmacology
Background:
- 3-indolepropionic acid (IPA) is a gut microbiota-derived metabolite with known anti-inflammatory properties.
- Previous observations suggested potential antidepressant effects of IPA, prompting further investigation.
Purpose of the Study:
- To investigate the antidepressant effects of IPA.
- To explore the underlying mechanisms of IPA's action, focusing on gut microbiota and brain inflammation.
Main Methods:
- Depression-like behaviors (DLBs) were induced in mice using chronic restraint stress (CRS).
- IPA was administered to mice with DLBs (20 mg/kg daily for 10 days).
- Fecal and hippocampal samples were analyzed for gut microbiota, short-chain fatty acids (SCFAs), G protein-coupled receptor 43 (GPR43), and inflammatory factors.
Main Results:
- CRS-induced mice exhibited disordered gut microbiota, reduced SCFAs, decreased GPR43, and elevated inflammation.
- IPA treatment significantly improved DLBs, normalized gut microbiota, and increased SCFA levels (acetic, propanoic, valeric acids).
- IPA administration also increased hippocampal GPR43 levels and decreased inflammation, with observed correlations between SCFAs, GPR43, and inflammation.
Conclusions:
- IPA demonstrates antidepressant effects, likely mediated by modulating gut microbiota.
- Elevated SCFA levels resulting from IPA treatment appear to alleviate brain inflammation.
- IPA's mechanism involves enhancing the gut microbiota-SCFA-GPR43-brain inflammation axis.
Related Concept Videos
01:30Inflammatory Bowel Disease III: Diagnostic Studies and Management I-Nutritional Therapy
Various diagnostic tests are employed in the diagnostic process for Inflammatory Bowel Disease (IBD), particularly to differentiate between Crohn's disease and ulcerative colitis.
Diagnostic studies
A colonoscopy is the definitive screening test, distinguishing ulcerative colitis from other colon diseases with similar symptoms. During a colonoscopy test, inflamed mucosa with exudate ulcerations can be observed, and biopsies are taken to determine the histologic characteristics of the colonic...
Diagnostic studies
A colonoscopy is the definitive screening test, distinguishing ulcerative colitis from other colon diseases with similar symptoms. During a colonoscopy test, inflamed mucosa with exudate ulcerations can be observed, and biopsies are taken to determine the histologic characteristics of the colonic...
01:25Inflammatory Bowel Disease III: Crohn's Disease
Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...
01:17Irritable Bowel Syndrome I: Introduction
Irritable Bowel Syndrome (IBS) is characterized by functional disturbances in the gastrointestinal system, presenting a cluster of symptoms without evident structural or biochemical abnormalities. It primarily affects the large intestine and may cause abdominal pain, bloating, excessive gas, diarrhea, constipation, or both.
IBS is a chronic condition that can persist over a long period or recur frequently.
The pathogenesis of IBS involves a complex interplay of the following factors:
Altered...
IBS is a chronic condition that can persist over a long period or recur frequently.
The pathogenesis of IBS involves a complex interplay of the following factors:
Altered...
01:29Drugs for Treatment of Ulcerative Colitis in IBD
Ulcerative colitis is a chronic inflammatory condition primarily affecting the colon and rectum. The primary drugs used in the treatment of ulcerative colitis are aminosalicylates. They exhibit anti-inflammatory and immunosuppressive properties. They modulate inflammatory mediators and inhibit the activity of nuclear factor κB (NF-κB). Aminosalicylates also reduce inflammation by inhibiting prostaglandin and leukotriene production and decreasing neutrophil chemotaxis and superoxide generation.
01:25Acute Inflammation III: Local and Systemic Effects
Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...