P5779

P5779 is a research-grade tetrapeptide with the amino acid sequence phenylalanine-serine-serine-glutamic acid (FSSE). It functions as a specific antagonist of myeloid differentiation factor 2 (MD-2), which is the essential co-receptor for Toll-like receptor 4 (TLR4). P5779 works by directly interrupting the interaction between high mobility group box 1 (HMGB1) and MD-2, thereby inhibiting the activation of the TLR4 signaling pathway and the subsequent release of pro-inflammatory cytokines. In preclinical mouse models, P5779 has demonstrated protective efficacy against hepatic ischemia/reperfusion injury, chemical-induced liver toxicity (such as acetaminophen overdose), sepsis, and pulmonary arterial hypertension. However, its clinical utility is currently limited by a very short half-life of less than two minutes, leading researchers to explore small-molecule mimetics that can replicate its binding profile.

Other names

FSSEphenylalanine-serine-serine-glutamic acid