Cardiomyocyte microvesicles: proinflammatory mediators after myocardial ischemia?

Area of Science:

• Cardiovascular Disease
• Molecular Biology
• Cellular Communication

Background:

• Myocardial infarction (MI) is a leading cause of death globally, with elevated C-reactive protein (CRP) indicating poor prognosis.
• Cardiomyocyte microvesicles (CMV) are released under stress and mediate cell-to-cell signaling.
• MicroRNAs (miRNA) within microvesicles (MV) can alter gene expression in recipient cells.

Purpose of the Study:

• To investigate if miRNA-containing CMV mediate hepatic CRP expression following cardiomyocyte hypoxia.
• To characterize miRNA profiles in CMV and their impact on liver cells.

Main Methods:

• Cultured H9c2 cells and isolated murine cardiomyocytes were subjected to hypoxia.
• Microvesicles (MV) were isolated and analyzed via flow cytometry.
• Next-generation sequencing profiled miRNA in CMV; co-culture models assessed IL-6 and CRP expression.

Main Results:

• CMV possess a distinct miRNA profile compared to parent cells, including inflammation-related miRNAs.
• CMV incubation induced IL-6 in macrophages and CRP in a hepatic co-culture model.
• Hypoxic cardiomyocyte-derived MV can mediate hepatic CRP expression.

Conclusions:

• MiRNA-carrying CMV from hypoxic cardiomyocytes can promote hepatic CRP expression.
• This highlights a potential pathway linking cardiac injury to systemic inflammation via intercellular communication.