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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Antimicrob+Agents+Chemother
2015 ; 59
(3
): 1495-504
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Sialic acid-binding protein Sp2CBMTD protects mice against lethal challenge with
emerging influenza A (H7N9) virus
#MMPMID25534734
Govorkova EA
; Baranovich T
; Marathe BM
; Yang L
; Taylor MA
; Webster RG
; Taylor GL
; Connaris H
Antimicrob Agents Chemother
2015[Mar]; 59
(3
): 1495-504
PMID25534734
show ga
Compounds that target the cellular factors essential for influenza virus
replication represent an innovative approach to antiviral therapy. Sp2CBMTD is a
genetically engineered multivalent protein that masks sialic acid-containing
cellular receptors on the respiratory epithelium, which are recognized by
influenza viruses. Here, we evaluated the antiviral potential of Sp2CBMTD against
lethal infection in mice with an emerging A/Anhui/1/2013 (H7N9) influenza virus
and addressed the mechanistic basis of its activity in vivo. Sp2CBMTD was
administered to mice intranasally as a single or repeated dose (0.1, 1, 10, or
100 ?g) before (day -7, -3, and/or -1) or after (6 or 24 h) H7N9 virus
inoculation. A single Sp2CBMTD dose (10 or 100 ?g) protected 80% to 100% of the
mice when administered 7 days before the H7N9 lethal challenge. Repeated Sp2CBMTD
administration conferred the highest protection, resulting in 100% survival of
the mice even at the lowest dose tested (0.1 ?g). When treatment began 24 h after
exposure to the H7N9 virus, a single administration of 100 ?g of Sp2CBMTD
protected 40% of the mice from death. The administration of Sp2CBMTD induced the
pulmonary expression of proinflammatory mediators (interleukin-6 [IL-6], IL-1?,
RANTES, monocyte chemotactic protein-1 [MCP-1], macrophage inflammatory
protein-1? [MIP-1?], and inducible protein [IP-10]) and recruited neutrophils to
the respiratory tract before H7N9 virus infection, which resulted in less
pronounced inflammation and rapid virus clearance from mouse lungs. Sp2CBMTD
administration did not affect the virus-specific adaptive immune response, which
was sufficient to protect against reinfection with a higher dose of homologous
H7N9 virus or heterologous H5N1 virus. Thus, Sp2CBMTD was effective in preventing
H7N9 infections in a lethal mouse model and holds promise as a prophylaxis option
against zoonotic influenza viruses.