A team of researchers from Toho University has discovered that ferulic acid (FA), a natural compound in rice bran, can suppress intestinal smooth muscle contractions by blocking calcium channels. This finding, published in the Journal of Pharmacological Sciences, could lead to new dietary strategies for managing conditions like irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD).
Ferulic acid, a polyphenol known for its antioxidant and neuroprotective benefits, is abundant in whole grains like rice bran. While its systemic effects have been studied, its role in gastrointestinal motility was unclear until now. The research team, led by Dr. Keisuke Obara, Dr. Kento Yoshioka, and Professor Yoshio Tanaka, investigated FA’s impact on intestinal contractions using guinea pig ileal smooth muscle.
The study found that FA reversibly inhibited contractions triggered by neurotransmitters such as acetylcholine and serotonin. Further experiments revealed that FA works by reducing calcium influx through voltage-dependent channels in smooth muscle cells. This mechanism suggests FA could help calm excessive contractions in diarrhea-predominant IBD but might worsen symptoms in constipation-predominant IBS or healthy individuals.
Dr. Keisuke Obara, one of the lead authors, stated, “Our findings highlight ferulic acid’s potential as a natural modulator of gut motility, paving the way for targeted dietary interventions.”
While the effective FA concentrations in the study were higher than typical dietary levels, the researchers noted that intestinal concentrations after ingestion could be significant. Further clinical trials are needed to confirm these effects in humans and determine optimal intake for therapeutic use. This research opens promising avenues for developing FA-based supplements or diets to manage intestinal motility disorders.
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