The paraventricular nucleus and heart failure.

Area of Science:

• Cardiovascular physiology
• Autonomic nervous system function
• Molecular signalling in cardiovascular disease

Background:

• Cardiovascular homeostasis relies on intricate autonomic nervous system regulation.
• The paraventricular nucleus (PVN) is central to sympathetic tone control.
• Heart failure involves dysregulation of the sympathetic nervous system.

Purpose of the Study:

• To review cellular and molecular mechanisms of autonomic nervous system involvement in cardiovascular regulation.
• To highlight advances in understanding non-pathological and pathological cardiovascular control.
• To identify knowledge gaps and suggest therapeutic strategies for heart failure.

Main Methods:

• Review of cellular and molecular mechanisms in autonomic nervous system.
• Analysis of signalling pathways in cardiovascular regulation.
• Examination of changes in the sympathetic nervous system pathway.

Main Results:

• Non-pathological cardiovascular homeostasis requires specific neural networks and signalling.
• In heart failure, CAPON and PIN proteins reduce nitric oxide (NO) bioavailability, inhibiting neuronal nitric oxide synthase.
• Myocardial infarction triggers pro-inflammatory cytokines and reactive oxygen species in the PVN, increasing sympathetic excitation.

Conclusions:

• Disrupted CAPON and PIN signalling reduces NO bioavailability, contributing to sympathetic dysregulation in heart failure.
• Pro-inflammatory responses and angiotensin II activation in the PVN exacerbate sympathetic excitation post-myocardial infarction.
• Understanding these mechanisms is crucial for developing new therapeutic strategies for heart failure.