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International Journal of Molecular Sciences

International Journal of Molecular Sciences

IF: 5.59
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Anti-Inflammatory Activities of an Anti-Histamine Drug, Loratadine, by Suppressing TAK1 in AP-1 Pathway

Published:1 April 2022 DOI: 10.3390/ijms23073986
Jiwon Jang,?Stephanie Triseptya Hunto,?Ji Won Kim,?Hwaryeong Lee,?H. Kim,?J. Cho

Abstract

Loratadine is an anti-histamine routinely used for treating allergies. However, recent findings have shown that Loratadine may also have anti-inflammatory functions, while their exact mechanisms have not yet been fully uncovered. In this paper, we investigated whether Loratadine can be utilized as an anti-inflammatory drug through a series of in vitro and in vivo experiments using a murine macrophage cell line and an acute gastritis mouse model. Loratadine was found to dramatically reduce the expression of pro-inflammatory genes, including MMP1, MMP3, and MMP9, and inhibit AP-1 transcriptional activation, as demonstrated by the luciferase assay. Therefore, we decided to further explore its role in the AP-1 signaling pathway. The expression of c-Jun and c-Fos, AP-1 subunits, was repressed by Loratadine and, correspondingly, the expression of p-JNK, p-MKK7, and p-TAK1 was also inhibited. In addition, Loratadine was able to reduce gastric bleeding in acute gastritis-induced mice; Western blotting using the stomach samples showed reduced p-c-Fos protein levels. Loratadine was shown to effectively suppress inflammation by specifically targeting TAK1 and suppressing consequent AP-1 signaling pathway activation and inflammatory cytokine production.

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Loratadine 79794-75-5 C22H23ClN2O2 825 suppliers $10.00-$2887.50
ETHYL 4-PHENYLBUTYRATE 10031-93-3 C12H16O2 117 suppliers $24.00-$2049.55
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c-jun 24 suppliers Inquiry
p-JNK Antibody (Thr 183) 4 suppliers Inquiry
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