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Related Experiment Video

Updated: Mar 15, 2026

Isolation of Primary Patient-specific Aortic Smooth Muscle Cells and Semiquantitative Real-time Contraction Measurements In Vitro

Isolation of Primary Patient-specific Aortic Smooth Muscle Cells and Semiquantitative Real-time Contraction Measurements In Vitro

Published on: February 15, 2022

TLR4-Activated MAPK-IL-6 Axis Regulates Vascular Smooth Muscle Cell Function.

Guan-Lin Lee^1,2, Jing-Yiing Wu³, Chien-Sung Tsai⁴

¹Institute of Cellular and System Medicine, National Health Research Institutes, Zhunan 35053, Taiwan. lgl0311@gmail.com.

International Journal of Molecular Sciences

|August 27, 2016

Summary

Toll-like receptor 4 (TLR4) activation promotes vascular smooth muscle cell (VSMC) migration in atherosclerosis. This process involves MyD88/TRIF, p38 MAPK, ERK1/2, CREB, and IL-6 signaling, ultimately affecting the actin cytoskeleton.

Keywords:

Interleukin 6 Toll-like receptor 4 cAMP response element binding protein migration vascular smooth muscle cells

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Visualization and Quantification of TGFβ/BMP/SMAD Signaling under Different Fluid Shear Stress Conditions using Proximity-Ligation-Assay

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Published on: September 14, 2021

Area of Science:

Cardiovascular Biology
Immunology
Cellular Signaling

Background:

Vascular smooth muscle cell (VSMC) migration is crucial in atherosclerosis development.
The role of Toll-like receptor 4 (TLR4) in VSMC migration is not fully understood.
Atherogenesis involves complex inflammatory and cellular processes.

Purpose of the Study:

To elucidate the molecular mechanisms by which TLR4 regulates VSMC migration.
To investigate the signaling pathways involved in TLR4-mediated VSMC migration.
To explore the clinical relevance of TLR4 and its ligands in coronary artery disease.

Main Methods:

Inhibitor experiments targeting signaling pathways (p38 MAPK, ERK1/2, CREB, Rac-1).
Use of Toll-like receptor 4 (TLR4) agonists and neutralizing antibodies.
Analysis of cytokine (IL-6) and protein expression.
Detection of serum and tissue biomarkers in patients with coronary artery disease (CAD) and in mouse models.

Main Results:

TLR4 activation induces IL-6 secretion and VSMC migration via MyD88/TRIF, p38 MAPK, and ERK1/2 signaling.
IL-6 is essential for TLR4-driven VSMC migration and F-actin polymerization.
CREB activation is downstream of p38 MAPK and ERK1/2, and CREB is required for IL-6 production and VSMC migration.
Rac-1 mediates TLR4-induced VSMC migration but not IL-6 production.
Elevated serum IL-6 and HMGB1 levels in CAD patients, with positive correlation and presence in atherosclerotic tissue.

Conclusions:

TLR4 signaling, through MyD88/TRIF, p38 MAPK, ERK1/2, and CREB, drives IL-6 production and subsequent Rac-1-mediated VSMC migration.
This pathway highlights a novel mechanism in atherogenesis.
HMGB1 and IL-6 are potential biomarkers for coronary artery disease.