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The priority pathogen list of the World Health Organization classified  Pseudomonas aeruginosa  as the second top critical pathogen. Hence, the development of novel antibacterial strategies to tackle this bacterium is highly necessary. Herein we explore the potential antibacterial effect of a standardized extract of cultured mycelium of  Lentinula edodes  (AHCC ® ) on  P. aeruginosa . AHCC ®  was found to inhibit the growth rate and biofilm formation of strain PAO1. No change in swarming was observed, but AHCC ®  hampered swimming and twitching motility. In accordance, a decreased expression of metabolism, growth, and biofilm formation genes was shown. AHCC ®  also diminished the levels of exotoxin A and bacteria inside IEC18 cells and the secretion of IL-6, IL-10 and TNF by infected macrophages. This effect was related to a reduced phosphorylation of MAPKs and to bacteria internalization. Taken together, our data suggest that AHCC ®  has a potential role to prevent  P. aeruginosa  infections and may lead to the development of new therapies.

A Standardized Extract of Lentinula edodes Cultured Mycelium Inhibits Pseudomonas aeruginosa Infectivity Mechanisms