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2012 ; 7
(7
): e40303
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Innate immune induction and influenza protection elicited by a response-selective
agonist of human C5a
#MMPMID22792270
Sanderson SD
; Thoman ML
; Kis K
; Virts EL
; Herrera EB
; Widmann S
; Sepulveda H
; Phillips JA
PLoS One
2012[]; 7
(7
): e40303
PMID22792270
show ga
The anaphylatoxin C5a is an especially potent mediator of both local and systemic
inflammation. However, C5a also plays an essential role in mucosal host defense
against bacterial, viral, and fungal infection. We have developed a
response-selective agonist of human C5a, termed EP67, which retains the
immunoenhancing activity of C5a at the expense of its inflammatory, anaphylagenic
properties. EP67 insufflation results in the rapid induction of pulmonary
cytokines and chemokines. This is followed by an influx of innate immune effector
cells, including neutrophils, NK cells, and dendritic cells. EP67 exhibits both
prophylactic and therapeutic protection when tested in a murine model of
influenza A infection. Mice treated with EP67 within a twenty-four hour window of
non-lethal infection were significantly protected from influenza-induced weight
loss. Furthermore, EP67 delivered twenty-four hours after lethal infection
completely blocked influenza-induced mortality (0% vs. 100% survival). Since
protection based on innate immune induction is not restricted to any specific
pathogen, EP67 may well prove equally efficacious against a wide variety of
possible viral, bacterial, and fungal pathogens. Such a strategy could be used to
stop the worldwide spread of emergent respiratory diseases, including but not
limited to novel strains of influenza.