A phosphatidylcholine building block protected heart mitochondria under pressure overload — in rats
Edited by Samael A. Tejada, Founder & Editor-in-Chief
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Pre-treatment with CDP-choline — the building block for the membrane lipid phosphatidylcholine — protected heart mitochondria during acute pressure overload in rats, keeping them coupled and efficient where untreated mitochondria failed (International Journal of Molecular Sciences, November 13, 2026). Kidney, liver and blood-pressure harms were not prevented; the work is a 60-minute rat experiment, not a treatment finding.
When a heart is suddenly forced to pump against a clamped aorta, its mitochondria are among the first casualties. This study tested whether feeding the membrane-repair pathway in advance — with the direct precursor of phosphatidylcholine — would keep them working. In rats, it did.
What did pressure overload do to mitochondria?
Sixty minutes of ascending aortic constriction produced severe under-perfusion: blood lactate quadrupled and pH fell, kidney markers rose, and mitochondria isolated from heart, liver and kidney showed dysregulated oxidative phosphorylation with lost complex III and IV activity. In the heart, the respiratory control ratio — the standard measure of how well mitochondria couple oxygen use to ATP production — collapsed to 1.50.
What did CDP-choline change?
Pre-treated rats (n=8 per group) showed significantly attenuated lactate accumulation (4.81 ± 1.45 vs. 8.76 ± 2.79 mmol/L, p<0.01) and better-preserved blood pH. Their heart mitochondria kept a respiratory control ratio of 5.10 vs. 1.50 and an ADP/O efficiency of 3.40 vs. 1.42 (both p<0.05); liver mitochondria were also protected. Mitochondrial hydrogen-peroxide release after fuel addition reached only 0.14 vs. 1.01 nmol/min/mg in untreated animals, and expression of complexes III, IV and V was preserved. CDP-choline is an intermediate in phosphatidylcholine synthesis and a membrane component essential for membrane fluidity and integrity — the proposed basis of the protection.
What did it not do — and what are the limits?
The protection was mitochondrial and metabolic, not a rescue of the whole animal: blood urea nitrogen, creatinine and LDH still rose in treated rats, and an AST increase appeared only in the treated group. This was pre-treatment before a planned 60-minute insult in anaesthetised rats — the opposite of treating a person after a cardiac event. Citicoline has a long history in human neurology research with mixed results; nothing here establishes a cardiac use in people.
Frequently asked questions
What is CDP-choline?
Also called citicoline: an intermediate the body uses to synthesise phosphatidylcholine, the main structural lipid of cell membranes, including mitochondrial membranes. It is sold as a supplement and used as a drug in some countries.
What is the respiratory control ratio?
A laboratory measure of mitochondrial coupling: how much faster mitochondria breathe when making ATP versus at rest. Higher means tighter, more efficient energy production; a collapse toward 1 means the machinery is uncoupled or damaged.
Does this mean citicoline protects human hearts?
No. It means pre-treatment protected rat heart mitochondria in one acute laboratory model. Human cardiac benefit is unproven.
Where the evidence stands
- Established: CDP-choline is the intermediate metabolite in phosphatidylcholine synthesis, and phosphatidylcholine is a principal structural lipid of cell and mitochondrial membranes. Acute pressure overload damages cardiac mitochondrial function in animal models.
- Preliminary: The protective effect: one acute rat study (International Journal of Molecular Sciences, 2026), n=8 per group, pre-treatment design, 60-minute endpoint.
- Absent: Evidence that CDP-choline protects the human heart, improves outcomes after cardiac events, or helps when given after — rather than before — an insult.
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