# Endothelin-1 and Vasomotor Tone Following Cardioplegic Ischemia/Reperfusion and Cardiopulmonary Bypass

## TL;DR

Endothelin-1 plays a key role in regulating blood vessel tone, and its abnormal activity after heart surgery may contribute to vascular dysfunction, suggesting new treatment possibilities.

## Contribution

This review highlights endothelin-1's role in vasomotor dysfunction after cardiac surgery and identifies it as a potential therapeutic target.

## Key findings

- Endothelin-1 activity is dysregulated in multiple vascular beds after cardiopulmonary bypass.
- Aberrant endothelin-1 signaling may contribute to postoperative vasomotor dysfunction.
- Targeting endothelin-1 pathways could reduce postoperative complications.

## Abstract

What are the main findings?
Endothelin-1 is an important regulator of vasomotor tone in the human bodyAbnormal endothelin-1 activity can be observed in several tissue beds following cardiac surgery involving cardiopulmonary bypass, including the systemic, coronary, skeletal muscle, mesenteric, and pulmonary circulations

Endothelin-1 is an important regulator of vasomotor tone in the human body

Abnormal endothelin-1 activity can be observed in several tissue beds following cardiac surgery involving cardiopulmonary bypass, including the systemic, coronary, skeletal muscle, mesenteric, and pulmonary circulations

What are the implications of the main findings?
Additional research is required to clarify some conflicting data regarding the nature of endothelin-1 dysfunction in certain vascular beds, such as in the coronary and skeletal microcirculationsAberrant endothelin-1 activity and signaling may be a potential therapeutic target for addressing postoperative vasomotor dysfunction following cardiac surgery involving cardiopulmonary bypass

Additional research is required to clarify some conflicting data regarding the nature of endothelin-1 dysfunction in certain vascular beds, such as in the coronary and skeletal microcirculations

Aberrant endothelin-1 activity and signaling may be a potential therapeutic target for addressing postoperative vasomotor dysfunction following cardiac surgery involving cardiopulmonary bypass

Endothelin-1 is a potent regulator of vasomotor tone and promotes endothelium-dependent vasoconstriction of vascular smooth muscle. Dysregulated vasomotor tone is a hallmark of microvascular pathology following cardiac surgery involving cardioplegia and cardiopulmonary bypass (CPB). This review begins with a discussion of the molecular biology of endothelin-1, the structure and function of endothelin receptors, and an overview of endothelin signaling pathways and endogenous regulation. Following this, the focus will turn to an exploration of abnormal endothelin-1 activity during and after CPB across different vascular systems, including coronary, pulmonary, skeletal muscle, peripheral, and mesenteric circulation. Finally, this review concludes with a discussion of drugs targeting endothelin-1 signaling pathways to protect vasomotor tone and microvascular function from ischemia/reperfusion-induced damage, highlighting new therapeutic targets to reduce postoperative morbidity and mortality.