Lymphoangiocrine signals promote cardiac growth and repair

Area of Science:

• Cardiovascular Biology
• Lymphatic System Research
• Regenerative Medicine

Background:

• Emerging evidence suggests lymphatic vessels play a role in cardiac repair.
• The specific mechanisms by which lymphatics influence heart function remain largely unexplored.

Purpose of the Study:

• To investigate the role of lymphatic endothelial cells (LECs) and their secreted factors in cardiac development, regeneration, and protection.
• To identify specific lymphoangiocrine signals involved in cardiomyocyte homeostasis and cardiac repair.

Main Methods:

• Analysis of lymphatic endothelial cell-deficient mouse models.
• In vitro studies using cardiomyocyte cultures with LEC-conditioned medium.
• Proteomic analysis of the LEC secretome.
• Genetic manipulation of reelin (RELN) in LECs.
• Assessment of cardiac function and regeneration after myocardial infarction in mice.

Main Results:

• Absence of LECs leads to smaller hearts due to reduced cardiomyocyte proliferation and increased apoptosis.
• LECs secrete factors, including reelin (RELN), that promote cardiomyocyte proliferation and survival.
• RELN is essential for heart development and repair after neonatal myocardial infarction.
• Cardiac delivery of RELN improves heart function and offers cardioprotection in adult mice post-myocardial infarction.

Conclusions:

• Lymphatic endothelial cells exert a crucial lymphoangiocrine influence on cardiac development and injury response.
• Reelin (RELN) is a key mediator of LEC-driven cardioprotection and cardiac repair.
• Targeting lymphoangiocrine signaling presents a potential therapeutic strategy for heart disease.