[HTML][HTML] Targeted complement inhibition by C3d recognition ameliorates tissue injury without apparent increase in susceptibility to infection

C Atkinson, H Song, B Lu, F Qiao… - The Journal of …, 2005 - Am Soc Clin Investig
C Atkinson, H Song, B Lu, F Qiao, TA Burns, VM Holers, GC Tsokos, S Tomlinson
The Journal of clinical investigation, 2005Am Soc Clin Investig
Previous studies indicate a pivotal role for complement in mediating both local and remote
injury following ischemia and reperfusion of the intestine. Here, we report on the use of a
mouse model of intestinal ischemia/reperfusion injury to investigate the strategy of targeting
complement inhibition to sites of complement activation by linking an iC3b/C3dg-binding
fragment of mouse complement receptor 2 (CR2) to a mouse complement-inhibitory protein,
Crry. We show that the novel CR2-Crry fusion protein targets sites of local and remote (lung) …
Previous studies indicate a pivotal role for complement in mediating both local and remote injury following ischemia and reperfusion of the intestine. Here, we report on the use of a mouse model of intestinal ischemia/reperfusion injury to investigate the strategy of targeting complement inhibition to sites of complement activation by linking an iC3b/C3dg-binding fragment of mouse complement receptor 2 (CR2) to a mouse complement-inhibitory protein, Crry. We show that the novel CR2-Crry fusion protein targets sites of local and remote (lung) complement activation following intestinal ischemia and reperfusion injury and that CR2-Crry requires a 10-fold lower dose than its systemic counterpart, Crry-Ig, to provide equivalent protection from both local and remote injury. CR2-Crry has a significantly shorter serum half-life than Crry-Ig and, unlike Crry-Ig, had no significant effect on serum complement activity at minimum effective therapeutic doses. Furthermore, the minimum effective dose of Crry-Ig significantly enhanced susceptibility to infection in a mouse model of acute septic peritonitis, whereas the effect of CR2-Crry on susceptibility to infection was indistinguishable from that of PBS control. Thus, compared with systemic inhibition, CR2-mediated targeting of a complement inhibitor of activation improved bioavailability, significantly enhanced efficacy, and maintained host resistance to infection.
The Journal of Clinical Investigation