M1 macrophage-derived migrasomes exacerbate post-myocardial infarction injury via guanylate binding protein 5

Area of Science:

• Cardiology
• Immunology
• Cell Biology

Background:

• Myocardial infarction (MI) involves vascular injury, necrosis, and immune responses.
• Migrasomes are novel organelles involved in cell communication.
• The role of migrasomes in MI-induced immune injury is unknown.

Purpose of the Study:

• To investigate the role of migrasomes in myocardial infarction.
• To identify the specific mechanisms by which migrasomes contribute to cardiac injury.
• To explore potential therapeutic strategies targeting migrasomes.

Main Methods:

• Induction of MI and assessment of migrasome production.
• Isolation and characterization of macrophage-derived migrasomes (M1-Migs).
• Quantitative proteomic analysis of M1-Migs, including GBP5 levels.
• Viral knockdown of GBP5 and pathway enrichment analysis (NF-κB signaling).
• Analysis of clinical samples and colchicine's effect on M1 macrophages.

Main Results:

• MI increased migrasome production, particularly from M1 macrophages.
• M1-derived migrasomes (M1-Migs) exacerbated myocardial injury.
• M1-Migs showed elevated levels of guanylate binding protein 5 (GBP5).
• GBP5 mediated M1-Mig-induced injury by activating NF-κB signaling, promoting apoptosis.
• Macrophage-derived migrasomes correlated positively with MI in clinical samples.
• Colchicine reduced M1 macrophage migrasome production.

Conclusions:

• Macrophage-derived migrasomes amplify myocardial injury post-MI.
• GBP5 is a key mediator of M1-Mig-induced cardiac damage.
• Targeting migrasome production presents a potential therapeutic avenue for MI.
• Findings support colchicine's clinical application in mitigating post-infarction injury.