Suppression of miR-155 Expression in IFN-gamma-Treated Astrocytes and Microglia by DJ-1: A Possible Mechanism for Maintaining SOCS1 Expression.
- Author:
Jong Hyeon KIM
1
;
Ilo JOU
;
Eun Hye JOE
Author Information
- Publication Type:Original Article
- Keywords: parkinson; DJ-1; SOCS1; miR-155; inflammation
- MeSH: Animals; Astrocytes*; Brain; Inflammation; Interferon-gamma; Mice; Microglia*; MicroRNAs; Parkinson Disease; RNA Stability; RNA, Messenger; Transducers
- From:Experimental Neurobiology 2014;23(2):148-154
- CountryRepublic of Korea
- Language:English
- Abstract: Previously, we reported that DJ-1, encoded by a Parkinson's disease (PD)-associated gene, inhibits expression of proinflammatory mediators in interferon-gamma (IFN-gamma)-treated astrocytes and microglia through inhibition of STAT1 activation. Here, using microglia and astrocytes cultured from wild-type (WT) and DJ-1-knockout (KO) mouse brains, we examined how DJ-1 regulates suppressor of cytokine signaling 1 (SOCS1), a negative feedback regulator of STAT1 (signal transducer and activator of transcription) that is also induced by STAT1. We found that IFN-gamma significantly increased SOCS1 mRNA expression in WT microglia and astrocytes, but not in KO cells, although STAT1 was highly activated in these latter cells. We further found that SOCS mRNA stability was decreased in DJ-1-KO cells, an effect that appeared to be mediated by the microRNA, miR-155. IFN-gamma increased the levels of miR-155 in DJ-1-KO cells but not in WT cells. In addition, an miR-155 inhibitor rescued SOCS1 expression and decreased STAT1 activation in DJ-1-KO cells. Taken together, these results suggest that DJ-1 efficiently regulates inflammation by maintaining SOCS1 expression through regulation of miR-155 levels, even under conditions in which STAT1 activation is decreased.
