Antioxidant and Anti-Inflammatory Potential of Shiitake Culinary-Medicinal Mushroom, Lentinus edodes (Agaricomycetes), Sporophores from Various Culture Conditions.

Lentinus edodes (= Lentinula edodes) is an edible mushroom grown and marketed for centuries due to its nutritional and medicinal properties. L. edodes has multiple pharmacological activities as an antioxidant and anti-inflammatory. Few studies were performed taking into account the influence of culture conditions to optimize the biological properties of L. edodes on human health. Our work focused on the comparison of antioxidant capacity and anti-inflammatory activity of L. edodes fruit bodies cultivated by three mushroom producers in the French Occitanie region using the same strain in various growing conditions (organic and nonorganic). Sequential extraction was performed on freeze-dried fungal materials. All extracts have a quantifiable but moderate antioxidant activity measured via DPPH and ORAC tests. The anti-inflammatory activity of the ethanol and aqueous extracts was evaluated on a model of inflammatory macrophages. The ethanol extracts inhibit NO production in a dose-dependent manner when the cells are pretreated for 4 h with a 24 h stimulation time.