New research from Japan introduces soy-based lysolecithin with lysophosphatidylcholine, known as LPC70, which could counteract the negative effects of a high-salt diet. Fujita Health University researchers discovered that this ingredient, composed of 70% phospholipids, reduces hypertension and improves memory in mice fed high-sodium diets. The study authors believe LPC70 could serve as a functional food ingredient to offset cardiovascular disease and cognitive decline linked to high sodium intake, a concern particularly relevant for populations with raised dietary salt consumption.

Mechanism of Action

Published in Neurochemistry International, the research explores how LPC70 counters the harms of excessive sodium by boosting protective prostaglandin signaling. Prostaglandins naturally act as the body’s internal shield, protecting the stomach lining from acid and keeping blood flowing to major organs. These fat-based signaling chemicals control inflammation, pain, and blood flow, playing an essential role in maintaining cardiovascular homeostasis through a balance between vasodilation and vasoconstriction.

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“We wanted to understand the role of LPC70 in coordinating changes in protective prostaglandin signaling across organ systems,” said lead study author Akihiro Mouri, a professor from the Department of Regulatory Science for Evaluation and Development of Pharmaceuticals & Devices at Fujita Health University’s Graduate School of Medical Science. The study involved eight-week-old male mice, because female mice exhibit relative resistance to salt sensitivity and hypertension caused by angiotensin II, a hormone that narrows blood vessels and raises blood pressure.

When the animals were fed a high-salt diet, signs of impaired behavioral and cognitive functions appeared alongside raised blood pressure. They specifically displayed signs of reduced social interaction and impaired object recognition memory, despite no major changes in locomotor activity or anxiety-like behavior. Adding the compound lowered the increased blood pressure and improved both social behavior and object recognition memory in these subjects.

While the results offer a promising biological explanation for how dietary fats might mitigate neurological damage from salt, the applicability to human diets remains uncertain. The mouse subjects were all male and developed symptoms of hypertension that do not always align with human presentations. Furthermore, prostaglandin signaling involves many layers; while boosting certain receptors may protect the brain, overstimulation can lead to inflammation or other issues. Translating this finding to a viable food supplement will require rigorous testing to ensure the balance of signaling chemicals remains within safe physiological ranges for patients with existing health conditions.

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Kidney and Brain Effects

Observations showed that the high-salt diet increased the protective prostaglandin E2 receptor EP3 in the mice’s kidneys. Because this receptor is involved in protective prostaglandin signaling, it may contribute to high-salt diet-induced hypertension, according to the scientists. Supplementation with LPC70 reduced these high-salt diet-associated changes in mice, suggesting that it can help normalize impaired protective prostaglandin signaling in the kidney.

In the mice’s prefrontal cortex — a region of the brain involved in cognition and social behavior — the high-salt diet reduced expression of the protective prostaglandin D2 receptor DP1, which mediates neuroprotective and anti-inflammatory signaling. Additionally, the paper notes that the ingredient did not affect a receptor associated with neurotoxic signaling. Mouri believes this receptor-specific response indicates that LPC70 can help shift protective prostaglandin D2 signaling toward a more neuroprotective profile.

Dietary Implications

The study team explains that protective prostaglandins are derived from arachidonic acid. Another important finding of the paper was related to the changes in the circulating levels of this acid. Despite a high-salt diet reducing circulating arachidonic acid levels in the animals, supplementing with LPC70 boosted their arachidonic acid-derived protective prostaglandins, including prostaglandin E2 and prostaglandin D2. This suggested that the phospholipid enhances arachidonic acid utilization, supporting arachidonic acid-derived protective prostaglandin production under high-salt diet conditions.

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The findings were released just as global regulators are tightening nutrition standards. With greater scrutiny placed on ultra-processed foods, sodium reduction comes into greater focus in reformulation strategies driven by stricter salt limits. Many consumers struggle to lower intake due to the palatability of salt. This study suggests that adding specific phospholipids derived from soy could be a viable method to offset some of the physiological damage caused by unavoidable sodium in processed diets.

“Our study elucidates LPC70’s role in protective prostaglandin signaling, laying the groundwork for future clinical research and dietary interventions aimed at reducing hypertension-related cognitive decline and promoting healthy aging globally,” Mouri concluded.