Peptides inhibit infection with H1N1 and
H5N1 viruses. MDCKI cells
were infected with H1N1pdm09 (A/Netherlands/602/2009) (a), H1N1pr8
(A/PR8/8/34/Mount Sinai) (b), H5N1 virus carrying H5 HA of A/duck/Hunan/795/2002
in the H1N1pr8 genetic background (c), and H3N1 virus carrying H3
HA of A/Bilthoven/1761/76 (H3N2) in the H1N1pr8 background (d) in
the presence of macrocyclic peptides L2, L4, S3, and S5 at 5 μM.
Left: representative images of immunofluorescence staining of the
IAV nucleoprotein (green). Nuclei are labeled with DAPI (blue). Right:
quantification of infected cells relative to untreated control. Data
are shown as mean ± SD (n = 3).