Signals triggered by a bacterial pore-forming toxin contribute to toll-like receptor redundancy in gram-positive bacterial recognition.

• The results illustrate that signals triggered by LLO contribute to TLR2 redundancy in recognition of L. monocytogenes. Under normal conditions, multiple and, sometimes, redundant pathways cooperate to induce a rapid antimicrobial defense. When one signaling pathway-in this case, TLR2-is removed from the system, the other pathways are still capable of mounting a sufficient response to ensure survival of the host.

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