UC San Diego Study Finds Ral-CTSA Pathway Destroys LDL Receptors, Cutting Cholesterol Clearance
Updated
Updated · Okdiario · Jun 29
UC San Diego Study Finds Ral-CTSA Pathway Destroys LDL Receptors, Cutting Cholesterol Clearance
1 articles · Updated · Okdiario · Jun 29
Summary
Nature-published research led by Alan Saltiel found that prolonged high dietary cholesterol activates Ral in the liver, pushing LDL receptors away from recycling and toward destruction.
CTSA emerged as the key enzyme in that breakdown pathway; blocking it with a small-molecule inhibitor stabilized liver LDL receptors and lowered circulating LDL cholesterol in mice.
The mechanism helps explain how high-cholesterol diets may not just add LDL directly but also erode the liver’s own capacity to clear “bad” cholesterol from blood.
A CTSA inhibitor already cleared Phase 1 safety testing in people for a shelved heart-failure program, potentially speeding a Phase 2 trial in patients with hard-to-control cholesterol.
The finding could complement statins and PCSK9 drugs rather than replace them, offering another route for patients who still cannot reach safe LDL levels.
To lower cholesterol, a new drug targets a cellular 'cleanup' enzyme. Could this 'fix' create bigger problems?
A heart failure drug passed safety trials. Could it be the key to solving high cholesterol?
Ral-CTSA Pathway Identified as Key Driver of Diet-Induced Hypercholesterolemia: Implications for Next-Generation LDL-Lowering Therapies
Overview
In June 2026, UC San Diego researchers made a landmark discovery that reveals how high cholesterol disrupts the body’s natural balance and increases the risk of heart disease. Their study shows that when LDL cholesterol builds up in the bloodstream, it forms plaques that block blood flow, leading to cardiovascular problems. The liver usually helps by removing cholesterol from the blood, but this new research uncovers a previously unknown pathway that explains why a high-cholesterol diet makes it harder for the liver to do its job. This breakthrough opens new possibilities for treating high cholesterol and preventing heart disease.