Nikhil Prasad Fact checked by:Thailand Medical News Team Jun 06, 2026 1 hour, 22 minutes ago
Medical News: Traditional Chinese Medicinal Herb Demonstrates Powerful Anti-Inflammatory Effects in Laboratory and Animal Studies by Suppressing NF-κB Signaling
Inflammation is a vital biological process that helps the body defend itself against infections and repair damaged tissues. However, when inflammatory responses become excessive or prolonged, they can contribute to a wide range of chronic diseases, including respiratory disorders, autoimmune conditions, cardiovascular diseases, and metabolic illnesses. A new study by Chinese researchers has revealed that an extract derived from Iris tectorum, a medicinal plant widely used in traditional Chinese medicine, may possess potent anti-inflammatory properties by targeting one of the body's most important inflammatory pathways.
Researchers discover that Iris tectorum extract significantly reduces inflammatory responses by blocking
the NF-κB signaling pathway in immune cells and animal models
The study focused on the rhizome of Iris tectorum Maxim., commonly known as Chuan She Gan, a traditional herbal medicine frequently used in China to relieve sore throat, respiratory infections, excessive phlegm, and other inflammatory conditions. Although the herb has been utilized for centuries, the biological mechanisms behind its therapeutic effects have remained poorly understood until now.
The research was conducted by scientists from the State Key Laboratory of Bioactive Substance and Function of Natural Medicines and the Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College in Beijing, China.
Identification of Key Bioactive Compounds
To better understand the medicinal potential of the herb, researchers first analyzed the phytochemical composition of the ethanol extract obtained from the rhizome of Iris tectorum. Their analysis identified four major isoflavonoid compounds: tectoridin, iridin, tectorigenin, and irigenin.
Among these phytochemical compounds, tectoridin was found to be the most abundant constituent, representing more than 15 percent of the extract. Previous investigations have suggested that these compounds may possess anti-inflammatory activity, prompting researchers to explore their effects in greater detail.
Significant Reduction in Inflammatory Molecules
The scientists investigated the effects of the extract using macrophages, specialized immune cells that play a central role in inflammation. The cells were stimulated with lipopolysaccharide (LPS), a bacterial toxin commonly used to trigger inflammatory responses in laboratory studies.
When exposed to LPS, macrophages produced large amounts of inflammatory molecules, including nitric oxide, interleukin-6 (IL-6), monocyte chemoattractant protein-1 (MCP-1), and interleukin-1 beta (IL-1β). These substances are known to contribute to tissue damage and disease progression when produced in excessive amounts.
The study found that treatment with the Iris tectorum extract significantly reduced the production of all these inflammatory mediators. Notably, the extract sharply decreased nitric oxide production while simultaneously suppressing the activity an
d expression of inducible nitric oxide synthase (iNOS), the enzyme responsible for generating nitric oxide during inflammatory responses.
Researchers also observed substantial reductions in IL-6, MCP-1, and IL-1β levels, indicating broad anti-inflammatory activity.
Blocking the NF-κB Master Switch
One of the most important findings of the study involved the NF-κB signaling pathway, widely regarded as one of the master regulators of inflammation.
Under inflammatory conditions, NF-κB becomes activated and moves into the nucleus of cells, where it switches on numerous genes responsible for producing inflammatory proteins and mediators. Excessive activation of NF-κB has been linked to numerous diseases, including inflammatory bowel disease, rheumatoid arthritis, asthma, sepsis, and certain cancers.
The researchers discovered that Iris tectorum extract effectively suppressed NF-κB activation. Specifically, the extract reduced phosphorylation of IκBα, a critical step required for NF-κB activation, and prevented the nuclear accumulation of the NF-κB p65 protein.
By interrupting this signaling cascade, the extract effectively blocked the activation of genes responsible for producing inflammatory molecules.
Importantly, the researchers found that the extract did not significantly affect the MAPK/AP-1 pathway, another major inflammatory signaling system. This suggests that the herb acts selectively on NF-κB signaling rather than broadly suppressing cellular functions.
This
Medical News report highlights a particularly important aspect of the findings: the extract appears to target a key molecular driver of inflammation while leaving other signaling pathways largely unaffected, a characteristic often sought in the development of safer anti-inflammatory therapies.
Promising Benefits Observed in Animal Models
To determine whether these anti-inflammatory effects extended beyond laboratory cells, researchers evaluated the extract in mice exposed to endotoxemia, a condition caused by bacterial toxins entering the bloodstream and triggering systemic inflammation.
Mice treated with the Iris tectorum extract before toxin exposure experienced significantly lower blood concentrations of IL-6, MCP-1, and tumor necrosis factor-alpha (TNF-α), all major markers of severe inflammatory responses. The reductions were dose-dependent, with higher doses producing stronger effects.
These results provide evidence that the extract may exert meaningful anti-inflammatory activity throughout the body and not merely in isolated cell cultures.
Conclusions
The new study provides compelling scientific evidence supporting the traditional use of Iris tectorum for inflammation-related disorders. Researchers demonstrated that the herbal extract effectively suppresses multiple inflammatory mediators while targeting the NF-κB signaling pathway, one of the most important molecular regulators of inflammation. By reducing nitric oxide production, suppressing pro-inflammatory cytokines, and preventing activation of NF-κB, the extract showed significant anti-inflammatory activity in both immune cells and animal models. While additional studies, including human clinical trials, will be required to establish safety and effectiveness in patients, these findings suggest that Iris tectorum may represent a promising source of future anti-inflammatory therapies. The research also provides a modern scientific explanation for the herb's long-standing use in traditional Chinese medicine and highlights its potential value in the management of inflammatory diseases.
The study findings were published in the peer reviewed journal: Biomedicines.
https://www.mdpi.com/2227-9059/14/6/1291
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