Antidepressant and anxiolytic effects of Wuling Capsule in CSDS mice: Alleviating HPA axis hyperactivity via the Nesfatin-1/NF-κB signaling pathway.

Feeling overwhelmed by depression or anxiety? A traditional Chinese herbal remedy called Wuling Capsule — made from a fermented medicinal fungus known as Xylaria nigripes — may offer real relief, and scientists are beginning to understand exactly why it works.

Researchers tested Wuling Capsule on mice that were subjected to chronic social defeat stress (CSDS), a well-established method of triggering depression and anxiety in animals. The stressed mice showed classic signs of these conditions: low motivation, fearfulness, and loss of pleasure in normally enjoyable activities.

The research team discovered that stress was causing the body's main stress-response system — called the HPA axis — to go into overdrive. This system releases hormones like cortisol (called corticosterone in mice) that, when chronically elevated, damage mood and mental health. The scientists traced this overactivation to a specific brain protein called Nesfatin-1, found in the hypothalamus. When stress levels rose, so did Nesfatin-1, which then switched on an inflammatory signaling pathway called NF-κB, ultimately flooding the body with stress hormones.

When mice were treated with Wuling Capsule, the results were striking. The herbal remedy reduced depression- and anxiety-like behaviors, calmed the overactive HPA axis, and lowered both Nesfatin-1 activity and NF-κB inflammation in the brain. The researchers also confirmed these findings by directly manipulating Nesfatin-1 levels in the brain — increasing it made things worse, while blocking it produced effects similar to the herbal treatment.

For patients, this research suggests that Wuling Capsule — already used clinically in China for mood disorders — has a measurable, scientifically supported mechanism of action, not just anecdotal support.

If you are interested in exploring herbal medicine or acupuncture as part of your mental health care, speak with a licensed Traditional Chinese Medicine practitioner to find an approach safely tailored to your needs.

This preclinical study investigated the antidepressant and anxiolytic mechanisms of Wuling Capsule (derived from fermented Xylaria nigripes) in a chronic social defeat stress (CSDS) murine model. HPLC-MS/MS identified 123 bioactive components in the formulation. CSDS induced depression- and anxiety-like behaviors confirmed via open field test, elevated plus maze, sucrose preference test, and forced swim test, alongside HPA axis hyperactivation marked by elevated ACTH, corticosterone, and hypothalamic CRH.

Key findings identified Nesfatin-1 upregulation in the paraventricular nucleus (PVN) as a critical mediator, driving NF-κB phosphorylation and downstream CRH elevation. Stereotaxic Nesfatin-1 overexpression replicated CSDS effects; PVN-targeted Nesfatin-1 knockdown or NF-κB antagonism reversed behavioral and neuroendocrine pathology. In vitro validation in N2a cells corroborated the Nesfatin-1/NF-κB/CRH cascade.

Wuling Capsule treatment significantly attenuated all behavioral deficits and suppressed the Nesfatin-1/NF-κB pathway. Clinical takeaway: Wuling Capsule offers a mechanistically validated herbal option for HPA-axis-driven mood disorders, warranting consideration in integrative mental health protocols.