Brain Protein NPTX2 Drives Chronic Itch in Eczema Through IL-31 Pathway | Research

The takeaway

Neuronal pentraxin 2 (NPTX2) in peripheral sensory neurons drives chronic itch in atopic dermatitis by potentiating IL-31/IL-31R signaling.

Novel itch target: NPTX2
Peripheral sensory neuron protein potentiates IL-31-mediated chronic itch in atopic dermatitis

What the researchers found

NPTX2 in peripheral sensory neurons amplifies IL-31/IL-31R-mediated chronic itch in atopic dermatitis, representing a novel therapeutic target.

Why it matters

Chronic itch devastates quality of life in eczema. Identifying NPTX2 as a new driver of itch signaling opens a novel target for anti-itch therapies.

How the study worked

Multi-technique study: RT-qPCR, immunohistochemistry, ELISA, western blot, and siRNA knockdown in AD models to characterize NPTX2's role in itch signaling.

What this study cannot tell us

Preclinical study — NPTX2's role in human AD-associated itch needs clinical validation; therapeutic targeting strategies not yet developed.

How to read the evidence

Preclinical mechanistic study — strong molecular evidence but clinical translation needs further development.

When this study was published

Published 2026 in International Immunopharmacology.

The bigger picture

The discovery of NPTX2's peripheral role in itch challenges its classification as purely a central nervous system protein and expands the landscape of itch therapeutic targets.

Questions still open

Can NPTX2 inhibitors be developed for itch treatment?
Is NPTX2 involved in chronic itch beyond atopic dermatitis?

Common questions

What causes the intense itch in eczema?

This study identified a protein called NPTX2 in sensory nerve cells that amplifies itch signals through the IL-31 pathway, helping explain why eczema itch can be so severe and persistent.

Could this lead to better anti-itch treatments?

Yes — targeting NPTX2 could provide a new way to reduce chronic itch. Current IL-31-blocking treatments already help, and targeting NPTX2 could enhance their effectiveness or offer an alternative.

Read the original research

Neuronal pentraxin 2 in peripheral sensory neurons drives chronic itch through potentiation of the interleukin-31/interleukin-31 receptor pathway in atopic dermatitis.

International immunopharmacology, 172, 116223

View on PubMed ↗Publisher’s paper ↗

Citation

Bai, Xue-Qiang; Wu, Bing-Xin; Wang, Ji-An; He, Cheng; Shen, Yong-Liang; Wei, Xiao; Zhang, Yu-Qi; Chen, Xue-Wen; Sun, Rong; Gui, Qun-Feng; Wang, Juan; Zhang, Zhi-Jun. (2026). Neuronal pentraxin 2 in peripheral sensory neurons drives chronic itch through potentiation of the interleukin-31/interleukin-31 receptor pathway in atopic dermatitis.. International immunopharmacology, 172, 116223. https://doi.org/10.1016/j.intimp.2026.116223