Macrophage migration inhibitory factor knockout attenuates endotoxin-induced cardiac dysfunction in mice

Area of Science:

• Cardiovascular Biology
• Immunology
• Molecular Medicine

Background:

• Macrophage migration inhibitory factor (MIF) is implicated in inflammatory and cardiovascular diseases.
• Sepsis-induced cardiac dysfunction is a critical clinical concern.

Purpose of the Study:

• To investigate the role of MIF in lipopolysaccharide (LPS)-induced cardiac dysfunction.
• To elucidate the underlying mechanisms of MIF-mediated cardiac dysfunction.

Main Methods:

• Echocardiography and cardiomyocyte function assays were performed on wild-type and MIF knockout mice treated with LPS.
• Levels of reactive oxygen species, protein carbonyls, activated mitogen-activated protein kinases (MAPKs), and endoplasmic reticulum (ER) stress markers were assessed.
• Human umbilical vein endothelial cells (HUVECs) were used to validate findings using short hairpin RNA (shRNA) to inhibit MIF.

Main Results:

• LPS treatment impaired cardiac function and increased macrophage infiltration in wild-type mice.
• MIF knockout mice exhibited attenuated cardiac dysfunction and reduced inflammatory/stress markers after LPS challenge.
• Inhibition of MIF in HUVECs reduced p-ERK and p-JNK activation.

Conclusions:

• MIF plays a critical role in mediating LPS-induced cardiac dysfunction in mice.
• MIF knockout significantly attenuated sepsis-induced cardiac dysfunction.
• Targeting MIF presents a potential therapeutic strategy for managing cardiac dysfunction in sepsis.