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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 J+Leukoc+Biol
2007 ; 82
(3
): 721-8
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Fas (CD95) induces macrophage proinflammatory chemokine production via a
MyD88-dependent, caspase-independent pathway
#MMPMID17576821
Altemeier WA
; Zhu X
; Berrington WR
; Harlan JM
; Liles WC
J Leukoc Biol
2007[Sep]; 82
(3
): 721-8
PMID17576821
show ga
Activation of the prototypical death receptor, Fas (CD95), can induce both
caspase-dependent cell death and production of proinflammatory chemokines,
leading to neutrophil recruitment and end-organ injury. The precise mechanism(s)
by which Fas up-regulates chemokine production and release, is currently unclear.
We hypothesized that Fas-induced chemokine release by macrophages is dependent on
the MyD88 adaptor molecule and independent of caspase activity. To test this
hypothesis, we measured chemokine response to Fas activation both in RAW 264.7
cells with RNAi-attenuated MyD88 expression and in MyD88-deficient primary
macrophages. We found that Fas-induced chemokine release was abrogated in the
absence of MyD88. In vivo, MyD88(-/-) mice had impaired CXCL1/KC release and
polymorphonuclear cell recruitment in response to intratracheal treatment with
the Fas-activating monoclonal antibody, Jo-2. Furthermore, Fas-induced chemokine
release was not dependent on either IL-1 receptor signaling or on caspase
activity. We conclude that MyD88 plays an integral role in Fas-induced
macrophage-mediated inflammation.