Researchers at Toho University found that ferulic acid, a compound in rice bran, can reduce intestinal muscle contractions by blocking calcium channels.

A study led by researchers at Toho University's Faculty of Pharmaceutical Sciences indicates that ferulic acid (FA), a compound found in rice bran, may help regulate intestinal motility. By testing the compound on guinea pig muscle tissue, the team discovered that FA reduces contractions by inhibiting voltage-dependent calcium channels. This finding suggests a potential future role for the compound in managing conditions like irritable bowel syndrome and inflammatory bowel disease.

Mechanism of Action

The research team, including Dr. Keisuke Obara, Dr. Kento Yoshioka, and Professor Yoshio Tanaka, found that FA acts in a noncompetitive manner to suppress muscle contractions. Rather than blocking specific signaling molecule receptors, the compound interferes with the calcium signaling process required for muscles to tighten. Experiments showed that FA reduced the rise in intracellular calcium triggered by potassium chloride in vascular smooth muscle cells.

Potential Clinical Applications and Limitations

The study suggests that FA could help calm excessive intestinal activity, potentially benefiting those with diarrhea-predominant conditions. However, the researchers noted that slowing intestinal movement could worsen symptoms for individuals with constipation-predominant IBS. Furthermore, the concentrations required to produce these effects in laboratory settings are higher than typical blood levels achieved through diet alone, though concentrations in the digestive tract may be higher following consumption.