NDRG1 Regulates Iron Metabolism and Inhibits Pathologic Cardiac Hypertrophy.

Area of Science:

• Cardiovascular Biology
• Cellular Biology
• Molecular Medicine

Background:

• Pathologic cardiac hypertrophy is a precursor to heart failure, with underlying cellular mechanisms not fully understood.
• N-myc downstream-regulated gene 1 (NDRG1) is implicated in cellular stress but its role in cardiac disease is unknown.
• This study investigates NDRG1's function in pathologic cardiac hypertrophy.

Purpose of the Study:

• To elucidate the role of NDRG1 in the development of cardiac hypertrophy.
• To determine the molecular mechanisms by which NDRG1 influences cardiomyocyte function.
• To explore NDRG1 as a potential therapeutic target for cardiac hypertrophy.

Main Methods:

• Utilized cardiomyocyte-specific NDRG1 knockout mice and AAV9-mediated overexpression.
• Induced cardiac hypertrophy using Angiotensin II (AngII) stimulation.
• Performed histologic, molecular, RNA-sequencing, ferroptosis, and iron level analyses, including co-immunoprecipitation and iron chelation.

Main Results:

• NDRG1 expression decreased in AngII-induced cardiac hypertrophy.
• NDRG1 deficiency led to progressive cardiac hypertrophy, heart failure, iron overload, and ferroptosis.
• NDRG1 overexpression reversed AngII-induced hypertrophy and fibrosis, with NDRG1 interacting with transferrin to regulate iron metabolism.

Conclusions:

• NDRG1 is critical for regulating iron metabolism and ferroptosis in cardiomyocytes.
• NDRG1 deficiency promotes cardiac hypertrophy and heart failure through iron dysregulation.
• NDRG1 and iron metabolism pathways represent potential therapeutic targets for cardiac hypertrophy.