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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+Biol+Chem
2015 ; 290
(45
): 26943-26953
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Novel Insights into Interleukin 6 (IL-6) Cis- and Trans-signaling Pathways by
Differentially Manipulating the Assembly of the IL-6 Signaling Complex
#MMPMID26363066
Lacroix M
; Rousseau F
; Guilhot F
; Malinge P
; Magistrelli G
; Herren S
; Jones SA
; Jones GW
; Scheller J
; Lissilaa R
; Kosco-Vilbois M
; Johnson Z
; Buatois V
; Ferlin W
J Biol Chem
2015[Nov]; 290
(45
): 26943-26953
PMID26363066
show ga
The IL-6 signaling complex is described as a hexamer, formed by the association
of two IL-6·IL-6 receptor (IL-6R)·gp130 trimers, with gp130 being the signal
transducer inducing cis- and trans-mediated signaling via a membrane-bound or
soluble form of the IL-6R, respectively. 25F10 is an anti-mouse IL-6R mAb that
binds to both membrane-bound IL-6R and soluble IL-6R with the unique property of
specifically inhibiting trans-mediated signaling events. In this study, epitope
mapping revealed that 25F10 interacts at site IIb of IL-6R but allows the binding
of IL-6 to the IL-6R and the recruitment of gp130, forming a trimer complex.
Binding of 25F10 to IL-6R prevented the formation of the hexameric complex
obligate for trans-mediated signaling, suggesting that the cis- and trans-modes
of IL-6 signaling adopt different mechanisms for receptor complex assembly. To
study this phenomenon also in the human system, we developed NI-1201, a mAb that
targets, in the human IL-6R sequence, the epitope recognized by 25F10 for mice.
Interestingly, NI-1201, however, did not selectively inhibit human IL-6
trans-signaling, although both mAbs produced beneficial outcomes in conditions of
exacerbated IL-6 as compared with a site I-directed mAb. These findings shed
light on the complexity of IL-6 signaling. First, triggering cis- versus
trans-mediated IL-6 signaling occurs via distinctive mechanisms for receptor
complex assembly in mice. Second, the formation of the receptor complex leading
to cis- and trans-signaling biology in mice and humans is different, and this
should be taken into account when developing strategies to inhibit IL-6
clinically.