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2005 ; 11
(11
): 1180-7
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CCL5-CCR5 interaction provides antiapoptotic signals for macrophage survival
during viral infection
#MMPMID16208318
Tyner JW
; Uchida O
; Kajiwara N
; Kim EY
; Patel AC
; O'Sullivan MP
; Walter MJ
; Schwendener RA
; Cook DN
; Danoff TM
; Holtzman MJ
Nat Med
2005[Nov]; 11
(11
): 1180-7
PMID16208318
show ga
Host defense against viruses probably depends on targeted death of infected host
cells and then clearance of cellular corpses by macrophages. For this process to
be effective, the macrophage must presumably avoid its own virus-induced death.
Here we identify one such mechanism. We show that mice lacking the chemokine Ccl5
are immune compromised to the point of delayed viral clearance, excessive airway
inflammation and respiratory death after mouse parainfluenza or human influenza
virus infection. Virus-inducible levels of Ccl5 are required to prevent apoptosis
of virus-infected mouse macrophages in vivo and mouse and human macrophages ex
vivo. The protective effect of Ccl5 requires activation of the Ccr5 chemokine
receptor and consequent bilateral activation of G(alphai)-PI3K-AKT and
G(alphai)-MEK-ERK signaling pathways. The antiapoptotic action of chemokine
signaling may therefore allow scavengers to finally stop the host cell-to-cell
infectious process.