Unknown

Dataset Information

0

MiR-19a: an effective regulator of SOCS3 and enhancer of JAK-STAT signalling.


ABSTRACT: Suppressors of cytokine signalling (SOCS) proteins are classic inhibitors of the Janus kinase-signal transducer and activator of transcription (JAK-STAT) pathway. Many cytokines and pathogenic mediators induce expression of SOCS, which act in a negative feedback loop to inhibit further signal transduction. SOCS mRNA expression is regulated by DNA binding of STAT proteins, however, their post-transcriptional regulation is poorly understood. microRNAs (miRNAs) are small non-coding RNAs that bind to complementary sequences on target mRNAs, often silencing gene expression. miR-19a has been shown to regulate SOCS1 expression during mutiple myeloma and be induced by the anti-viral cytokine interferon-(IFN)-?, suggesting a role in the regulation of the JAK-STAT pathway. This study aimed to identify targets of miR-19a in the JAK-STAT pathway and elucidate the functional consequences. Bioinformatic analysis identified highly conserved 3'UTR miR-19a target sequences in several JAK-STAT associated genes, including SOCS1, SOCS3, SOCS5 and Cullin (Cul) 5. Functional studies revealed that miR-19a significantly decreased SOCS3 mRNA and protein, while a miR-19a antagomir specifically reversed its inhibitory effect. Furthermore, miR-19a-mediated reduction of SOCS3 enhanced IFN-? and interleukin (IL)-6 signal transduction through STAT3. These results reveal a novel mechanism by which miR-19a may augment JAK-STAT signal transduction via control of SOCS3 expression and are fundamental to the understanding of inflammatory regulation.

PROVIDER: S-EPMC3718810 | BioStudies |

REPOSITORIES: biostudies

Similar Datasets

| S-EPMC2865742 | BioStudies
2012-01-01 | S-EPMC3382127 | BioStudies
| S-EPMC8746995 | BioStudies
| S-EPMC6206482 | BioStudies
| S-EPMC5908791 | BioStudies
| S-EPMC4678202 | BioStudies
| S-EPMC3732068 | BioStudies
| S-EPMC7003395 | BioStudies
| S-EPMC4817095 | BioStudies
| S-ECPF-GEOD-22801 | BioStudies