Desmosomes in Cell Fate Determination: From Cardiogenesis to Cardiomyopathy

Area of Science:

• Cardiovascular Biology
• Cell Biology
• Molecular Medicine

Background:

• Desmosomes are crucial for heart structural integrity, especially under mechanical stress.
• Defects in desmosomal proteins are linked to arrhythmogenic cardiomyopathy (AC).
• Understanding non-myocyte roles in AC is vital due to limited preventative strategies.

Purpose of the Study:

• To review the impact of desmosome deficiency on epicardial and endocardial cells.
• To explore the relationship between desmosomal mutations, signaling pathways, and epicardial cell fate.
• To differentiate the consequences of desmosome deficiency in embryonic versus adult hearts.

Main Methods:

• Literature review focusing on desmosome function in cardiac non-myocytes.
• Analysis of signaling pathways affected by desmosomal protein mutations.
• Comparison of desmosome deficiency outcomes in embryonic and adult cardiac development.

Main Results:

• Desmosome deficiency in epicardial/endocardial cells influences cell fate transitions.
• Embryonic hearts show enhanced erythropoiesis; mature hearts exhibit increased fibrogenesis.
• Shared pathways lead to distinct pathological outcomes in different cardiac cell states.

Conclusions:

• Desmosome deficiency impacts cardiac non-myocytes, contributing to AC.
• Age-dependent responses (erythropoiesis vs. fibrogenesis) highlight distinct pathological mechanisms.
• Targeting specific cell states is crucial for developing effective therapeutic strategies for AC.