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2016 ; 113
(38
): 10625-30
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Rabex-5 is a lenalidomide target molecule that negatively regulates TLR-induced
type 1 IFN production
#MMPMID27601648
Millrine D
; Tei M
; Gemechu Y
; Kishimoto T
Proc Natl Acad Sci U S A
2016[Sep]; 113
(38
): 10625-30
PMID27601648
show ga
Immunomodulatory drugs (IMiDs) are a family of compounds derived from
thalidomide. Binding of the IMiD molecule to the Lon protease Cereblon initiates
the degradation of substrates via the ubiquitin proteasome pathway. Here, we show
that Cereblon forms a complex with Rabex-5, a regulator of immune homeostasis.
Treatment with lenalidomide prevented the association of Cereblon with Rabex-5.
Conversely, mutation of the IMiD binding site increased Cereblon-Rabex-5
coimmunoprecipitation. The thalidomide binding region of Cereblon therefore
regulates the formation of this complex. Knockdown of Rabex-5 in the THP-1
macrophage cell line up-regulated Toll-like receptor (TLR)-induced cytokine and
type 1 IFN production via a STAT1/IRF activating pathway. Thus, we identify
Rabex-5 as a IMiD target molecule that functions to restrain TLR activated
auto-immune promoting pathways. We propose that release of Rabex-5 from complex
with Cereblon enables the suppression of immune responses, contributing to the
antiinflammatory properties of IMiDs.