Osthole inhibits histamine-dependent itch via modulating TRPV1 activity.
Yang NN, Shi H, Yu G, et al. Osthole inhibits histamine-dependent itch via modulating TRPV1 activity. Sci Rep 2016;6:25657.
Study type: Animal + electrophysiology (nerve-cell recordings) · Added to this library August 23, 2026
What the researchers did
Osthole tested directly on the itch-sensing channel TRPV1 in sensory neurons.
What they found
Histamine-induced scratching cut from 70 bouts to 11; TRPV1 blocked at sub-micromolar potency (IC50 ≈0.41 µM) — while non-histamine chloroquine itch was untouched, proving the mechanism is specific.
Why it matters
Drug-grade potency at a named ion channel, from a seed that village medicine has used against itch for a millennium.
Relates to the patterns: Damp-Heat · Wind (itch)
This summary is educational and does not replace care from your child's pediatrician. Evidence tiers matter: a finding in cells or animals is a reason a treatment could work, not proof that it does.
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The effects of Chinese botanical lotion and pimecrolimus cream in the treatment of chronic perianal eczema: a randomized clinical trial.
Lai L, et al. The effects of Chinese botanical lotion and pimecrolimus cream in the treatment of chronic perianal eczema: a randomized clinical trial. Front Pharmacol 2025;16:1673112.
Study type: RCT (n=99, three hospitals, vs pimecrolimus)
What: A Ku Shen-based herbal lotion head-to-head against pimecrolimus (a standard prescription cream) for chronic perianal eczema.
Found: Higher response rate (100% vs 88%), better itch relief, and — the striking number — relapse at 12 weeks: 6% on the herbal lotion vs 20% on pimecrolimus. No serious adverse events.
Why it matters: A third of the relapses. That pattern — the herb changing the terrain rather than just muting the symptom — is the entire premise of pattern-based treatment.
Matrine regulates Th1/Th2 inflammatory responses by inhibiting the Hsp90/NF-κB signaling axis to alleviate atopic dermatitis.
Huang P, Hu F, Yang ZB, et al. Matrine regulates Th1/Th2 inflammatory responses by inhibiting the Hsp90/NF-κB signaling axis to alleviate atopic dermatitis. Kaohsiung J Med Sci 2023;39(5):501-510.
Study type: Animal + in vitro
What: Matrine, Ku Shen's main alkaloid, in eczema mice and inflamed human keratinocytes.
Found: Lowered Th2 cytokines and the eczema chemokine TARC; blocked the Hsp90/NF-κB axis; stopped T cells differentiating toward the allergic Th2 type.
Why it matters: The bitter cold "stop itch" herb works upstream, on the allergic polarisation itself.
The mechanism of oxymatrine on atopic dermatitis in mice based on SOCS1/JAK-STAT3 pathway.
Han X, Ma T, Wang Q, et al. The mechanism of oxymatrine on atopic dermatitis in mice based on SOCS1/JAK-STAT3 pathway. Front Pharmacol 2023;13:1091090.
Study type: Animal (dose-controlled)
What: Oxymatrine, Ku Shen's second alkaloid, in the calcipotriol eczema model.
Found: Dose-dependent falls in IL-4, IL-6, IL-17, TNF-α and IgE; worked by boosting SOCS1, the body's own brake on the JAK-STAT inflammation pathway.
Why it matters: JAK inhibitors are dermatology's newest eczema drug class; Ku Shen's alkaloid reaches the same pathway through the body's own off-switch.
Antipruritic Effects of Sophora flavescens on Acute and Chronic Itch-Related Responses in Mice.
Yamaguchi-Miyamoto T, et al. Antipruritic Effects of Sophora flavescens on Acute and Chronic Itch-Related Responses in Mice. Biol Pharm Bull 2003;26(5):722-6.
Study type: Animal
What: The classic screening study of Ku Shen against acute and chronic itch.
Found: Dose-dependent suppression of both induced and spontaneous chronic scratching, without sedation; more potent than She Chuang Zi in the same screen.
Why it matters: "Stops itch" survived a modern behavioural assay two decades ago — this is the study that put Ku Shen on pharmacology's map for pruritus.