Identification of NURR1 as a mediator of MIF signaling during chronic arthritis: Effects on glucocorticoid-induced MKP1

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Identification of NURR1 as a mediator of MIF signaling during chronic arthritis : Effects on glucocorticoid-induced MKP1. / Ralph, Jennifer A.; Ahmed, Afsar U.; Santos, Leilani L.; Clark, Andrew R.; McMorrow, Jason; Murphy, Evelyn P.; Morand, Eric F.

In: American Journal of Pathology, Vol. 177, No. 5, 11.2010, p. 2366-2378.

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Ralph, Jennifer A. ; Ahmed, Afsar U. ; Santos, Leilani L. ; Clark, Andrew R. ; McMorrow, Jason ; Murphy, Evelyn P. ; Morand, Eric F. / Identification of NURR1 as a mediator of MIF signaling during chronic arthritis : Effects on glucocorticoid-induced MKP1. In: American Journal of Pathology. 2010 ; Vol. 177, No. 5. pp. 2366-2378.

Bibtex

@article{a4f0cb3b470845928a2bf9542962cd34,
title = "Identification of NURR1 as a mediator of MIF signaling during chronic arthritis: Effects on glucocorticoid-induced MKP1",
abstract = "Elucidation of factors regulating glucocorticoid (GC) sensitivity is required for the development of {"}steroid-sparing{"} therapies for chronic inflammatory diseases, including rheumatoid arthritis (RA). Accumulating evidence suggests that macrophage migration inhibitory factor (MIF) counterregulates the GC-induction of anti-inflammatory mediators, including mitogen-activated protein kinase phosphatase 1 (MKP1), a critical mitogen-activated protein kinase signaling inhibitor. This observation has yet to be extended to human disease; the molecular mechanisms remain unknown. We investigated NURR1, a GC-responsive transcription factor overexpressed in RA, as a MIF signaling target. We reveal abrogation by recombinant MIF (rMIF) of GC-induced MKP1 expression in RA fibroblast-like synoviocytes (FLS). rMIF enhanced NURR1 expression, artificial NBRE (orphan receptor DNA-binding site) reporter transactivation, and reversed GC-inhibition of NURR1. NURR1 expression was reduced during experimental arthritis in MIF-/- synovium, and silencing MIF reduced RA FLS NURR1 mRNA. Consistent with NBRE identification on the MKP1 gene, MKP1 mRNA was reduced in FLS that ectopically express NURR1, and silencing NURR1 enhanced MKP1 mRNA in RA FLS. rMIF enhanced NBRE binding on the MKP1 gene, and the absence of the NBRE prevented NURR1-repressive effects on basal and GC-induced MKP1 transactivation. This study defines NURR1 as a novel MIF target in chronic inflammation and demonstrates a role for NURR1 in regulating the anti-inflammatory mediator, MKP1. We propose a MIF-NURR1 signaling axis as a regulator of the GC sensitivity of MKP1.",
author = "Ralph, {Jennifer A.} and Ahmed, {Afsar U.} and Santos, {Leilani L.} and Clark, {Andrew R.} and Jason McMorrow and Murphy, {Evelyn P.} and Morand, {Eric F.}",
year = "2010",
month = nov,
doi = "10.2353/ajpath.2010.091204",
language = "English",
volume = "177",
pages = "2366--2378",
journal = "The American Journal of Pathology",
issn = "0002-9440",
publisher = "American Society for Investigative Pathology",
number = "5",

}

RIS

TY - JOUR

T1 - Identification of NURR1 as a mediator of MIF signaling during chronic arthritis

T2 - Effects on glucocorticoid-induced MKP1

AU - Ralph, Jennifer A.

AU - Ahmed, Afsar U.

AU - Santos, Leilani L.

AU - Clark, Andrew R.

AU - McMorrow, Jason

AU - Murphy, Evelyn P.

AU - Morand, Eric F.

PY - 2010/11

Y1 - 2010/11

N2 - Elucidation of factors regulating glucocorticoid (GC) sensitivity is required for the development of "steroid-sparing" therapies for chronic inflammatory diseases, including rheumatoid arthritis (RA). Accumulating evidence suggests that macrophage migration inhibitory factor (MIF) counterregulates the GC-induction of anti-inflammatory mediators, including mitogen-activated protein kinase phosphatase 1 (MKP1), a critical mitogen-activated protein kinase signaling inhibitor. This observation has yet to be extended to human disease; the molecular mechanisms remain unknown. We investigated NURR1, a GC-responsive transcription factor overexpressed in RA, as a MIF signaling target. We reveal abrogation by recombinant MIF (rMIF) of GC-induced MKP1 expression in RA fibroblast-like synoviocytes (FLS). rMIF enhanced NURR1 expression, artificial NBRE (orphan receptor DNA-binding site) reporter transactivation, and reversed GC-inhibition of NURR1. NURR1 expression was reduced during experimental arthritis in MIF-/- synovium, and silencing MIF reduced RA FLS NURR1 mRNA. Consistent with NBRE identification on the MKP1 gene, MKP1 mRNA was reduced in FLS that ectopically express NURR1, and silencing NURR1 enhanced MKP1 mRNA in RA FLS. rMIF enhanced NBRE binding on the MKP1 gene, and the absence of the NBRE prevented NURR1-repressive effects on basal and GC-induced MKP1 transactivation. This study defines NURR1 as a novel MIF target in chronic inflammation and demonstrates a role for NURR1 in regulating the anti-inflammatory mediator, MKP1. We propose a MIF-NURR1 signaling axis as a regulator of the GC sensitivity of MKP1.

AB - Elucidation of factors regulating glucocorticoid (GC) sensitivity is required for the development of "steroid-sparing" therapies for chronic inflammatory diseases, including rheumatoid arthritis (RA). Accumulating evidence suggests that macrophage migration inhibitory factor (MIF) counterregulates the GC-induction of anti-inflammatory mediators, including mitogen-activated protein kinase phosphatase 1 (MKP1), a critical mitogen-activated protein kinase signaling inhibitor. This observation has yet to be extended to human disease; the molecular mechanisms remain unknown. We investigated NURR1, a GC-responsive transcription factor overexpressed in RA, as a MIF signaling target. We reveal abrogation by recombinant MIF (rMIF) of GC-induced MKP1 expression in RA fibroblast-like synoviocytes (FLS). rMIF enhanced NURR1 expression, artificial NBRE (orphan receptor DNA-binding site) reporter transactivation, and reversed GC-inhibition of NURR1. NURR1 expression was reduced during experimental arthritis in MIF-/- synovium, and silencing MIF reduced RA FLS NURR1 mRNA. Consistent with NBRE identification on the MKP1 gene, MKP1 mRNA was reduced in FLS that ectopically express NURR1, and silencing NURR1 enhanced MKP1 mRNA in RA FLS. rMIF enhanced NBRE binding on the MKP1 gene, and the absence of the NBRE prevented NURR1-repressive effects on basal and GC-induced MKP1 transactivation. This study defines NURR1 as a novel MIF target in chronic inflammation and demonstrates a role for NURR1 in regulating the anti-inflammatory mediator, MKP1. We propose a MIF-NURR1 signaling axis as a regulator of the GC sensitivity of MKP1.

UR - http://www.scopus.com/inward/record.url?scp=78149317984&partnerID=8YFLogxK

U2 - 10.2353/ajpath.2010.091204

DO - 10.2353/ajpath.2010.091204

M3 - Article

AN - SCOPUS:78149317984

VL - 177

SP - 2366

EP - 2378

JO - The American Journal of Pathology

JF - The American Journal of Pathology

SN - 0002-9440

IS - 5

ER -