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2018 ; 9
(ä): 902
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Human Metapneumovirus Infection Inhibits Cathelicidin Antimicrobial Peptide
Expression in Human Macrophages
#MMPMID29780383
Li Y
; Østerhus S
; Johnsen IB
Front Immunol
2018[]; 9
(ä): 902
PMID29780383
show ga
Human cathelicidin antimicriobial peptide (CAMP) is a critical component of host
innate immunity with both antimicrobial and immunomodulatory functions. Several
pathogens have been shown to downregulate CAMP expression, yet it is unclear if
such modulation occurs during a viral infection. In this study, we showed that
infection with human metapneumovirus (hMPV), one of the leading causes of
respiratory tract infections in young children, strongly suppressed basal and
vitamin-D induced CAMP expression in human macrophages. hMPV-mediated suppression
of CAMP did not correlate with reduced transcriptional expression of key vitamin
D signaling components, such as CYP27B1 or vitamin D receptor, suggesting a
vitamin D-independent mechanism. Blocking interferon-signaling pathways did not
reverse hMVP-mediated suppression of CAMP, indicating that the suppressive effect
is largely interferon-independent. Instead, we identified C/EBP? as the key
modulator of hMPV-mediated suppression of CAMP. hMPV infection strongly repressed
the expression of C/EBP?, and a knockdown study confirmed that C/EBP? is critical
for CAMP expression in human macrophages. Such modulation of CAMP (and C/EBP?)
could be reproduced by TLR1/2 ligand treatment in human macrophages, suggesting a
common mechanism underlying pathogen-mediated downregulation of CAMP through
C/EBP?. This study opens up a new understanding of altered human antimicrobial
responses following infections.