Immunomodulatory Role of <i>Rosmarinus officinalis</i> L., <i>Mentha</i> x <i>piperita</i> L., and <i>Lavandula angustifolia</i> L. Essential Oils in Sheep Peripheral Blood Mononuclear Cells
2024
Maria Giovanna Ciliberti | Marzia Albenzio | Agostino Sevi | Laura Frabboni | Rosaria Marino | Mariangela Caroprese
Recently, the uses of essential oils (EOs) as rumen modifiers, anti-inflammatory agents, and antioxidants were demonstrated in livestock. In the present study, the role of <i>Mentha</i> x <i>piperita</i> L. (MEO), <i>Rosmarinus officinalis</i> L. (REO), and <i>Lavandula angustifolia</i> L. (LEO) EOs in an in vitro sheep model of inflammation was investigated. With this aim, peripheral blood mononuclear cells (PBMCs) were treated with incremental concentrations (3, 5, 7, and 10%) of each EO to test their effects on cell viability and proliferation and on interleukin (IL)-6, IL-10, and IL-8 secretion. The PBMCs were stimulated by Concanavalin A (ConA) alone or in combination with lipopolysaccharide (LPS) mitogen. The positive and negative controls were represented by PBMCs in the presence or absence, respectively, of mitogens only. The cell viability and proliferation were determined by XTT and BrdU assays, while the cytokines were analyzed by ELISA. The EO treatments did not affect the viability; on the contrary, the PBMC proliferation increased in presence of all the EOs tested, according to the different percentages and mitogens used. The IL-10 secretion was higher in both the REO and the LEO tested at 3% than in the positive control; furthermore, the IL-8 level was influenced differently by the various EOs. The present data demonstrate that EOs may modulate the immune response activated by inflammation.
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