Does pressure cause liver cirrhosis? The sinusoidal pressure hypothesis

Area of Science:

• Hepatology
• Pathophysiology
• Biomedical Engineering

Background:

• Chronic liver diseases lead to cirrhosis, a global health issue with poorly understood mechanisms and limited treatments.
• Current understanding views pressure changes as a consequence of cirrhosis, not its cause.

Purpose of the Study:

• Introduce the sinusoidal pressure hypothesis (SPH) identifying elevated sinusoidal pressure (SP) as the cause of liver fibrosis.
• Propose SPH as a unifying theory explaining macroscopic changes and fibrotic responses in cirrhosis.

Main Methods:

• Derived from recent studies on liver stiffness and biomechanical signaling.
• Analyzed the role of elevated arterial flow and liver arterialization in fibrosis perpetuation.

Main Results:

• SPH posits elevated SP as the upstream initiator of fibrosis via biomechanic signaling.
• Predicts fibrosis progression correlates with SP duration and magnitude, with critical thresholds (>12 mmHg, >4 wk).
• Identifies liver arterialization as a self-perpetuating event causing irreversible fibrosis.

Conclusions:

• SPH offers a novel explanation for cirrhosis development, unifying various etiologies.
• This hypothesis may illuminate the role of fat and extrahepatic disease mechanisms.
• SPH provides a new framework for developing innovative therapeutic strategies for liver fibrosis.