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2015 ; 290
(13
): 8457-68
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Loss of the polarity protein PAR3 activates STAT3 signaling via an atypical
protein kinase C (aPKC)/NF-?B/interleukin-6 (IL-6) axis in mouse mammary cells
#MMPMID25657002
Guyer RA
; Macara IG
J Biol Chem
2015[Mar]; 290
(13
): 8457-68
PMID25657002
show ga
PAR3 suppresses tumor growth and metastasis in vivo and cell invasion through
matrix in vitro. We propose that PAR3 organizes and limits multiple signaling
pathways and that inappropriate activation of these pathways occurs without PAR3.
Silencing Pard3 in conjunction with oncogenic activation promotes invasion and
metastasis via constitutive STAT3 activity in mouse models, but the mechanism for
this is unknown. We now show that loss of PAR3 triggers increased production of
interleukin-6, which induces STAT3 signaling in an autocrine manner. Activation
of atypical protein kinase C ?/? (aPKC?/?) mediates this effect by stimulating
NF-?B signaling and IL-6 expression. Our results suggest that PAR3 restrains
aPKC?/? activity and thus prevents aPKC?/? from activating an oncogenic signaling
network.