A Tick Mannose-Binding Lectin Inhibitor Interferes with the Vertebrate Complement Cascade to Enhance Transmission of the Lyme Disease Agent

作者：Schuijt Tim J^*; Coumou Jeroen; Narasimhan Sukanya; Dai Jianfeng; DePonte Kathleen; Wouters Diana; Brouwer Mieke; Oei Anneke; Roelofs Joris J T H; van Dam Alje P; van der Poll Tom; van'; t Veer Cornelis; Hovius Joppe W; Fikrig Erol

来源：Cell Host & Microbe, 2011, 10(2): 136-146.

DOI：10.1016/j.chom.2011.06.010

The Lyme disease agent Borrelia burgdorferi is primarily transmitted to vertebrates by Ixodes ticks. The classical and alternative complement pathways are important in Borrelia eradication by the vertebrate host. We recently identified a tick salivary protein, designated P8, which reduced complement-mediated killing of Borrelia. We now discover that P8 interferes with the human lectin complement cascade, resulting in impaired neutrophil phagocytosis and chemotaxis and diminished Borrelia lysis. Therefore, P8 was renamed the tick salivary lectin pathway inhibitor (TSLPI). TSLPI-silenced ticks, or ticks exposed to TSLPI-immune mice, were hampered in Borrelia transmission. Moreover, Borrelia acquisition and persistence in tick midguts was impaired in ticks feeding on TSLPI-immunized, B. burgdorferi-infected mice. Together, our findings suggest an essential role for the lectin complement cascade in Borrelia eradication and demonstrate how a vector-borne pathogen co-opts a vector protein to facilitate early mammalian infection and vector colonization.

• 出版日期2011-8-18