Baicalein Inhibits Dextran Sulfate Sodium-induced Mouse Colitis

Area of Science:

• Pharmacology
• Molecular Biology
• Gastroenterology

Background:

• Baicalein is a flavone from *Scutellaria baicalensis* Georgi, used in traditional Chinese medicine.
• It is known to treat inflammatory conditions, including inflammatory bowel diseases.
• The precise molecular mechanisms of baicalein's anti-colitis effects are not fully understood.

Purpose of the Study:

• To investigate the molecular mechanisms underlying baicalein's protective effects against experimental colitis.
• To examine the impact of baicalein on NF-κB and STAT3 signaling pathways in a mouse model of colitis.

Main Methods:

• Experimental colitis was induced using dextran sulfate sodium (DSS) in mice.
• Mice were treated with baicalein (10 or 25 mg/kg) orally.
• Western blot analysis was used to assess protein expression and phosphorylation (COX-2, iNOS, IκBα, p65, STAT3, cyclin D1) and IκB kinase β (IKKβ) activity.

Main Results:

• Baicalein significantly reduced the severity of DSS-induced colitis.
• It inhibited the expression of COX-2 and iNOS, and attenuated IKKβ activity and IκBα degradation.
• Baicalein suppressed NF-κB p65 phosphorylation and nuclear translocation, and inhibited STAT3 phosphorylation and cyclin D1 expression.

Conclusions:

• Baicalein's protective effects in DSS-induced colitis are mediated by the suppression of NF-κB and STAT3 signaling pathways.
• These findings suggest baicalein may have potential cancer-preventive effects against colon carcinogenesis.