# The Marine Compound Isaridin E Ameliorates Lipopolysaccharide-Induced Vascular Endothelial Inflammation via the Downregulation of the TLR4/NF-κB Signaling Pathway

## TL;DR

A marine compound called isaridin E reduces inflammation in blood vessels by blocking a key signaling pathway, suggesting it could be a new treatment for vascular inflammation.

## Contribution

This study identifies isaridin E as a novel anti-inflammatory agent that targets the TLR4/NF-κB pathway in vascular inflammation.

## Key findings

- Isaridin E reduces pro-inflammatory cytokines and adhesion molecules in LPS-stimulated endothelial cells.
- The compound attenuates vascular hyperpermeability and inflammatory cell infiltration in a murine endotoxemia model.
- Isaridin E inhibits TLR4 and NF-κB signaling, preserving tissue integrity in aortic and pulmonary tissues.

## Abstract

Isaridin E, a cyclodepsipeptide derived from the marine fungus Beauveria felina (SYSU-MS7908), has been demonstrated to possess multiple biological properties. In this study, we employed both lipopolysaccharide (LPS)-stimulated human umbilical vein endothelial cells (HUVECs) and a LPS-induced murine endotoxemia model to investigate its anti-inflammatory effects. Our results revealed that isaridin E suppressed the expression of pro-inflammatory cytokines and adhesion molecules in a concentration dependent manner, while also reducing monocyte adhesion to endothelial cells. Furthermore, this compound attenuated vascular hyperpermeability and inflammatory cell infiltration in the lungs, as well as preserving the integrity of the aortic and pulmonary tissues. At the molecular level, isaridin E was found to downregulate TLR4 expression, increase IκBα levels, and inhibit the LPS-induced phosphorylation and nuclear translocation of NF-κB p65. In conclusion, our findings indicate that isaridin E exerts robust anti-inflammatory effects in LPS-induced endotoxemia through the suppression of the TLR4/NF-κB signaling axis, positioning it as a promising therapeutic candidate for vascular inflammatory disorders.