Early Cardiac Ischemia-Reperfusion Injury: Interactions of Autophagy with Galectin-3 and Oxidative Stress

Area of Science:

• Cardiovascular Biology
• Cellular Physiology
• Molecular Medicine

Background:

• Cardiovascular diseases are a leading global cause of mortality.
• Ischemia-reperfusion (IR) injury causes cardiac myocyte death.
• Investigating galectin-3's role in IR-induced autophagy is crucial.

Purpose of the Study:

• To investigate the role of galectin-3 (Gal-3) in autophagy during myocardial ischemia-reperfusion (IR) injury.
• To understand the impact of Gal-3 absence on cardiac autophagy markers and stress responses post-IR.

Main Methods:

• Utilized a murine model of IR injury using wild-type and galectin-3 knockout (KO) mice.
• Collected heart samples and serum 24 hours post-IR for analysis.
• Employed immunohistochemical labeling, immunofluorescent labeling, and ELISA for quantification.

Main Results:

• Gal-3 concentrations increased in wild-type mouse left ventricles (LVs) post-IR.
• IR Gal-3 KO mice showed higher LV autophagy proteins (e.g., phospho-AMPK) and lower inhibitory proteins (e.g., phospho-mTOR, p62) compared to wild-type.
• IR Gal-3 KO mice exhibited higher oxidative stress and lower antioxidant activity in LVs.

Conclusions:

• Galectin-3 interacts with autophagy, oxidative stress, and antioxidant pathways in the heart.
• Absence of Gal-3 enhances cardiac autophagy following IR injury.
• Findings suggest Gal-3 modulation as a potential therapeutic strategy for IR injury.