Cardiomyocyte-enriched protein CIP protects against pathophysiological stresses and regulates cardiac homeostasis

Area of Science:

• Cardiovascular Biology
• Molecular Cardiology
• Genetic Medicine

Background:

• Cardiomyopathy involves cardiac remodeling and contractile dysfunction, often linked to genetic factors.
• The mechanisms by which cardiomyocytes sense stress and modulate cardiac remodeling are not fully understood.
• Cardiac ISL1-interacting protein (CIP) is a myocyte-enriched protein with a known role in cardiac function.

Purpose of the Study:

• To investigate the role of cardiac ISL1-interacting protein (CIP) in regulating cardiac hypertrophy and dilation.
• To determine the impact of CIP deficiency and overexpression on cardiac remodeling and function in mouse models.
• To elucidate the molecular mechanisms underlying CIP's function in response to cardiac stress.

Main Methods:

• Analysis of CIP expression in human dilated cardiomyopathy patients.
• Evaluation of cardiac remodeling and function in CIP-deficient and CIP-overexpressing mouse models.
• Transcriptome analysis of CIP-deficient hearts under pressure overload.
• Investigating the role of p53 and FOXO1 pathways in CIP-mediated cardiac homeostasis.

Main Results:

• CIP expression is reduced in patients with dilated cardiomyopathy.
• CIP deficiency accelerates heart failure progression in multiple cardiomyopathy models.
• CIP overexpression prevents pathological cardiac remodeling and preserves cardiac function.
• CIP deficiency disrupts p53- and FOXO1-mediated gene networks under stress.
• FOXO1 overexpression mitigates stress-induced cardiomyocyte hypertrophy in CIP-deficient cells.

Conclusions:

• Cardiac ISL1-interacting protein (CIP) is a critical regulator of cardiac remodeling and function.
• CIP plays a protective role against the development and progression of cardiomyopathy.
• CIP represents a promising therapeutic target for attenuating heart failure progression.