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  • Title: Hydroalcoholic plant extracts with anti-inflammatory activity.
    Author: Herold A, Cremer L, Călugaru A, Tamaş V, Ionescu F, Manea S, Szegli G.
    Journal: Roum Arch Microbiol Immunol; 2003; 62(1-2):117-29. PubMed ID: 15493372.
    Abstract:
    The aim of the present study was to investigate if standardized hydroalcoholic plant extracts such as Calendula officinalis, Hypericum perforatum, Plantago lanceolata and Glycyrrhiza glabra can suppress in cell-free systems the activities of 5-lipoxygenase (5-LO) and cyclooxygenase-2 (COX-2), key enzymes in the formation of proinflammatory eicosanoids from arachidonic acid (AA). Studies were undertaken to compare the above mentioned plant extracts to a known NSAID (nimesulide) in their ability to inhibit both cyclooxygenase (COX-2) and lipoxygenase (5-LO) activities in cell-free systems. We report on 2 vegetal extracts (Hypericum perforatum and Glycyrrhiza glabra) that inhibit 5-LO activity and 2 vegetal extracts (Plantago lanceolata and Glycyrrhiza glabra) that inhibit COX-2 activity. In this study, we demonstrate for the first time that Glycyrrhiza glabra extract efficiently suppresses both eicosanoids and leukotrienes formation in cell-free systems, implying that this extract directly acts as a dual inhibitor of 5-LO and COX-2 activities. With regard to the properties of dual COX-2/5-LO inhibitors, Glycyrrhiza glabra extract might be a potential drug possessing anti-inflammatory activity devoid of the most troublesome (gastric) side effects seen for drugs used as COX-2 and 5-LO inhibitors. Hypericum perforatum, Plantago lanceolata and Glycyrrhiza glabra extracts can be added to an already impressive list of these species that have anti-inflammatory activity.
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