2. Academic Validation
  3. TRPA1 is involved in the inhibitory effect of Ke-teng-zi on allergic contact dermatitis via MAPK and JAK/STAT3 signaling pathways

TRPA1 is involved in the inhibitory effect of Ke-teng-zi on allergic contact dermatitis via MAPK and JAK/STAT3 signaling pathways

  • J Ethnopharmacol. 2023 Jan 24;307:116182. doi: 10.1016/j.jep.2023.116182.
Yankun Ju 1,  Miao Luo 1,  Ting Yan 1,  Zhengfan Zhou 1,  Man Zhang 1,  Zhongqiu Zhao 2,  Xinqiao Liu 1,  Zhinan Mei 3,  Hui Xiong 4
Affiliations

Affiliations

  • 1 School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China.
  • 2 Center for the Study of Itch, Department of Anesthesiology, Washington University School of Medicine, St Louis, MO, 63110, USA; Barnes-Jewish Hospital, St Louis, MO, 63110, USA.
  • 3 School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430074, China. Electronic address: [email protected].
  • 4 School of Pharmaceutical Sciences, South-Central Minzu University, Wuhan, 430074, China. Electronic address: [email protected].
PMID: 36706935 DOI: 10.1016/j.jep.2023.116182
Abstract

Ethnopharmacological relevance: The seeds of Entada phaseoloides (Linn.) Merr. commonly named "Ke-teng-zi" is a traditional Chinese folk medicine and reported to treat dermatitis, spasm, and headache. However, the exact effect and the mechanism of Ke-teng-zi on the treatment of dermatitis is unclear.

Aim of the study: To elucidate the antipruritic effect and molecular mechanisms of Ke-teng-zi on the treatment of allergic contact dermatitis (ACD).

Materials and methods: The main components of the n-butanol fraction of 70% ethanol extract from Ke-teng-zi (abbreviated as KB) were analyzed by HPLC. The chloroquine (CQ)-induced acute itch and squaraine dibutyl ester (SADBE)-induced ACD chronic itch in mice was established, and the TNF-α/IFN-γ stimulated Human keratinocytes (HaCaT) were used to evaluate the antipruritic and anti-inflammatory effects of KB. Behavioral tests, lesion scoring, and histology were also examined. The expression levels of molecules in MAPK and JAK/STAT3 pathways, the mRNA levels of chemokines and cytokines in both the skin of ACD mice and the HaCaT cells were detected by western blot and qPCR. Furthermore, whole-cell patch-clamp recordings in TRPA1-tranfected HEK293T cells were used to elucidate the effect of KB on TRPA1 channels. TRPA1 siRNA was used to evaluate the role of TRPA1 in the anti-inflammatory effect of KB in keratinocytes.

Results: The main compounds in KB could bind to the active sites of TRPA1 mainly through hydrogen bond and hydrophobic bond interactions. KB could inhibit the scratching behavior in CQ-induced acute itch, and the inhibitory effect of KB was blocked by TRPA1 inhibitor HC-030031. In addition, KB significantly decreased the scratching bouts of ACD mice, reduced the skin lesion scores, mast cells degranulation, and epidermal thickening, inhibited the production of inflammatory chemokines/cytokines and CGRP, and down-regulated the levels of p-ERK1/2, p-p38, and p-STAT3, compared to the ACD mice. Moreover, continuous application of KB induced the desensitization of TRPA1 channels. Also, KB inhibited the expression of p-ERK1/2, p-p38, and p-STAT3, and down-regulated the expression of inflammatory chemokines and cytokines in vitro, which were reversed by the TRPA1 siRNA.

Conclusions: KB alleviated the pruritus and skin inflammation in ACD mice through TRPA1 channels desensitization and down-regulation of intracellular MAPK and JAK/STAT3 signaling pathways. Our results suggested that Ke-teng-zi is a potential drug for the treatment of inflammatory skin diseases such as ACD.

Keywords

Allergic contact dermatitis; Entada phaseoloides (Linn.) Merr.; TRPA1.

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