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Identification of Cyclin-Dependent Kinase 1 as a Novel Regulator of Type I Interferon Signaling in Systemic Lupus Erythematosus

Identification of Cyclin-Dependent Kinase 1 as a Novel Regulator of Type I Interferon Signaling in Systemic Lupus Erythematosus

Arthritis and Rheumatology 68(5): 1222-1232

ISSN/ISBN: 0024-4082

PMID: 26663909

DOI: 10.1002/art.39543

Type I interferon (IFN) signaling is regarded as a central pathogenic pathway in systemic lupus erythematosus (SLE). Specific inhibition of this pathway is a core area for the development of new therapies for SLE. This study was undertaken to clarify the pathogenic mechanism involved and to identify new therapeutic targets, using a high-throughput screening platform to determine novel regulators that contribute to the overactivation of the type I IFN signaling pathway in SLE. A high-throughput IFN-stimulated response element (ISRE)-luciferase assay was used to screen for candidate genes that regulate the IFN signaling pathway. Western blotting was used to confirm the regulatory function of CDK1. SYBR Green quantitative reverse transcriptase-polymerase chain reaction was used to detect the expression of individual IFN-stimulated genes (ISGs). The differential expression of CDK1 and ISGs in SLE patients and healthy controls was analyzed using RNA sequencing data and a microarray. The high-throughput ISRE-luciferase assay revealed that CDK1 enhanced type I IFN signaling. Consistent with this finding, CDK1 promoted the type I IFN-induced phosphorylation of STAT-1 and the up-regulated expression of ISGs. CDK1 expression was elevated in peripheral blood mononuclear cells (PBMCs) and kidney biopsy specimens from SLE patients and correlated positively with their IFN scores. A CDK1 inhibitor reduced the expression of ISGs in PBMCs from SLE patients and in renal cells from mice with lupus. Our findings indicate that CDK1 is a positive regulator of the IFN signaling pathway. The overexpression of CDK1 might contribute to the abnormally amplified type I IFN signaling in SLE, and the inhibition of CDK1 could be used to down-regulate type I IFN signaling in SLE.

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Accession: 058035918

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