Spirulina is celebrated as a so-called “superfood” because of its possible beneficial properties, though its mechanism of action is still under investigation. With the scientific name of Arthrospira platensis, spirulina is a cyanobacterium capable of photosynthesis. Sometimes classified as a “blue algae,” it was supposedly used as a food by the Aztecs.
Now, a research from the Vascular Physiopathology Laboratory of the I.R.C.C.S. Neuromed in Pozzilli (Italy) shows that one of its extracts may counteract arterial hypertension by dilating blood vessels. Neuromed researchers, working in collaboration with University of Salerno, Sapienza University of Rome and Federico II University of Naples, isolated a peptide from spirulina extract capable of dilating arteries, thus leading to antihypertensive action. The study, published in the journal Hypertension, was conducted both in the laboratory, on isolated arteries, and on animal models.
Albino Carrizzo, first author of the paper, says, “Our research started by conducting simulated gastrointestinal digestion on the raw extract of spirulina. In other words, we reproduced what happens in the human gut after ingesting the substance. This way we have been able to isolate the peptides that would be absorbed by our body.”
One of the isolated peptides, SP6, has been identified for the first time. Administered to isolated blood vessels in the lab, it showed vasodilatory action, a potentially antihypertensive effect. This led researchers to administer SP6 to hypertensive animals, resulting in an effective lowering of blood pressure.
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