Neuregulin‑1 protects cardiac function in septic rats through multiple targets based on endothelial cells

Area of Science:

• Cardiovascular Biology
• Cellular Biology
• Immunology

Background:

• Sepsis-induced cardiac dysfunction is a critical complication primarily driven by endothelial barrier dysfunction.
• Neuregulin-1 (NRG-1) is a key signaling molecule with known roles in various cellular processes.
• Understanding NRG-1's protective mechanisms in sepsis is crucial for developing targeted therapies.

Purpose of the Study:

• To investigate the protective effects of Neuregulin-1 (NRG-1) on myocardial and endothelial cells during sepsis.
• To elucidate the anti-inflammatory and anti-apoptotic actions of NRG-1 in a sepsis model.
• To determine NRG-1's impact on the RhoA/ROCK1 signaling pathway in sepsis.

Main Methods:

• Lipopolysaccharide (LPS)-induced sepsis model in rats and H9c2 cardiomyoblasts.
• Administration of recombinant human NRG-1 (rhNRG-1) and vehicle control.
• Assessment of cardiac function, endothelial barrier integrity (Von Willebrand Factor), inflammatory markers (TNF-α, IL-6), apoptosis (TUNEL), and RhoA/ROCK1 signaling (Western Blot).

Main Results:

• NRG-1 treatment significantly reduced myocardial damage and improved cardiac function in septic rats.
• NRG-1 administration strengthened vascular barrier function and decreased pro-inflammatory and pro-apoptotic markers.
• NRG-1 inhibited the RhoA and ROCK1 signaling pathways, indicating a key molecular mechanism.

Conclusions:

• Neuregulin-1 (NRG-1) demonstrates significant protective effects against sepsis-induced cardiac dysfunction.
• NRG-1 acts through multiple targets, including strengthening endothelial barriers, reducing inflammation, and inhibiting apoptosis.
• NRG-1 represents a promising therapeutic candidate for reversing myocardial and endothelial cell damage in sepsis.