A naturally occurring compound derived from pomegranate leaves and branches demonstrates the capacity to break down protein aggregates linked to transthyretin (TTR) amyloidosis, a condition affecting both the nervous system and the heart. This finding was achieved by researchers at Kumamoto University, and the study’s outcomes were published in the journal iScience.
TTR amyloidosis involves the accumulation of an abnormal protein (amyloid) within tissues, leading to damage in the peripheral nervous system, heart, kidneys, and other organs. Symptoms frequently associated with this condition include shortness of breath during physical exertion, episodes of dizziness, heart failure, and persistent pain.
Seeking novel agents to combat this ailment, the research team systematically investigated over 1,500 different plant extracts. The compound identified as exhibiting the highest activity was 1,2,3,4,6-penta-O-galloyl-$\beta$-D-glucose (PGG), naturally present in pomegranates. In controlled laboratory experiments, PGG successfully induced the disintegration of amyloid fibrils originating from both mutant and wild-type forms of transthyretin, without adversely affecting other proteins present.
In subsequent nematode trials, this substance led to a reduction in the quantity of protein deposits and contributed to an extension of the organisms’ lifespan. Furthermore, PGG was shown to dismantle amyloid fibrils isolated from the cardiac tissue of patients diagnosed with hereditary TTR amyloidosis, suggesting promising implications for clinical application.
The research concluded that PGG’s efficacy stems directly from its molecular architecture: it is the specific “branches” of chemical moieties (the galloyl groups) attached to the core molecule that enable the compound to firmly bind to and subsequently destroy the hazardous proteins.
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