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The autophagy receptor SQSTM1/p62 mediates anti-inflammatory actions of the selective NR3C1/glucocorticoid receptor modulator compound A (CpdA) in macrophages.
- Source :
-
Autophagy [Autophagy] 2018; Vol. 14 (12), pp. 2049-2064. Date of Electronic Publication: 2018 Sep 14. - Publication Year :
- 2018
-
Abstract
- Glucocorticoids are widely used to treat inflammatory disorders; however, prolonged use of glucocorticoids results in side effects including osteoporosis, diabetes and obesity. Compound A (CpdA), identified as a selective NR3C1/glucocorticoid receptor (nuclear receptor subfamily 3, group C, member 1) modulator, exhibits an inflammation-suppressive effect, largely in the absence of detrimental side effects. To understand the mechanistic differences between the classic glucocorticoid dexamethasone (DEX) and CpdA, we looked for proteins oppositely regulated in bone marrow-derived macrophages using an unbiased proteomics approach. We found that the autophagy receptor SQSTM1 but not NR3C1 mediates the anti-inflammatory action of CpdA. CpdA drives SQSTM1 upregulation by recruiting the NFE2L2 transcription factor to its promoter. In contrast, the classic NR3C1 ligand dexamethasone recruits NR3C1 to the Sqstm1 promoter and other NFE2L2-controlled gene promoters, resulting in gene downregulation. Both DEX and CpdA induce autophagy, with marked different autophagy characteristics and morphology. Suppression of LPS-induced Il6 and Ccl2 genes by CpdA in macrophages is hampered upon Sqstm1 silencing, confirming that SQSTM1 is essential for the anti-inflammatory capacity of CpdA, at least in this cell type. Together, these results demonstrate how off-target mechanisms of selective NR3C1 ligands may contribute to a more efficient anti-inflammatory therapy.
- Subjects :
- Animals
Cells, Cultured
Dexamethasone pharmacology
Gene Expression Regulation drug effects
Macrophages metabolism
Male
Mice
Mice, Inbred C57BL
Receptors, Glucocorticoid metabolism
Sequestosome-1 Protein genetics
Transcriptional Activation drug effects
Tyramine pharmacology
Acetates pharmacology
Anti-Inflammatory Agents pharmacology
Inflammation genetics
Inflammation prevention & control
Macrophages drug effects
Receptors, Glucocorticoid agonists
Sequestosome-1 Protein physiology
Tyramine analogs & derivatives
Subjects
Details
- Language :
- English
- ISSN :
- 1554-8635
- Volume :
- 14
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Autophagy
- Publication Type :
- Academic Journal
- Accession number :
- 30215534
- Full Text :
- https://doi.org/10.1080/15548627.2018.1495681