Beetroot Peptide and Its Potential in Anti-Inflammatory Drug Development
The Role of Plants in Medicinal Applications
Plants have played a crucial role in medicine for centuries, with nearly 50% of pharmaceuticals originating from natural products. Notable examples include aspirin, derived from willow bark, and the anti-cancer drugs vinblastine and vincristine, sourced from the rosy-periwinkle flower. Other significant medications have been created from the Pacific yew tree, foxglove, and poppy plants.
Medicinal Properties and Plant Defense Mechanisms
The medicinal properties of plants often stem from their inherent defense mechanisms against predators. To protect themselves from microorganisms and pests, plants have developed various strategies, including physical defenses like spines and internal chemical defenses. One such defense involves the secretion of small protein molecules known as peptides, found in seeds, leaves, or roots. These peptides prevent herbivores from digesting, storing, or metabolizing plant proteins.
Research on Beetroot Peptides
A research team from MedUni Vienna’s Institute of Pharmacology conducted extensive searches of plant and animal genetic databases to identify potential candidates for drug development from natural sources. Their recent study, published in the Journal of Natural Products, focused on beetroot to explore its peptide content for potential disease treatments.
The researchers analyzed dried leaves and roots of the beet plant, extracting a substantial sample of beetroot juice, which was then freeze-dried for experimentation. Through advanced techniques such as mass spectrometry, reverse-phase liquid chromatography, and genome mining, the team gained a deeper understanding of the peptides present in beetroot.
Findings and Implications for Drug Development
The study successfully isolated peptides utilized by beetroot for its defense mechanisms. Notably, one identified peptide inhibits prolyl oligopeptidase (POP), an enzyme linked to inflammatory diseases such as Alzheimer’s Disease and multiple sclerosis. Dr. Christian Gruber, the study leader, highlighted the importance of these findings, stating, “Our attention was drawn to a possible function as so-called ‘protease inhibitors.’ The beetroot peptide can… inhibit enzymes that digest proteins. This means that, in future studies, this group of plant peptides called ‘knottins,’ such as those found in beetroot, could potentially provide a drug candidate for treating these diseases.”
Commercial Availability and Cautionary Notes
Interestingly, the identified beetroot peptide is also present in low quantities in commercial beetroot juice. While the study suggests the potential of beetroot peptides in developing treatments for inflammatory diseases, the authors caution against overestimating its effects, stating, “it would be unreasonable to hope that dementia could be prevented by regular consumption of beetroot.”
References
– Fuleky G. Cultivated Plants, Primarily as Food Sources. Eolss Publishers Co Ltd; 2009.
– Retzl B, Hellinger R, Muratspahić E, Pinto MEF, Bolzani VS, Gruber CW. Discovery of a Beetroot Protease Inhibitor to Identify and Classify Plant-Derived Cystine Knot Peptides. Journal of Natural Products. 2020. doi:10.1021/acs.jnatprod.0c00648
– Wong K. Mother Nature’s Medicine Cabinet. Scientific American. https://www.scientificamerican.com/article/mother-natures-medicine-c/. Published April 9, 2001.