Promoter Methylation Leads to Decreased ZFP36 Expression and Deregulated NLRP3 Inflammasome Activation in Psoriatic Fibroblasts

Frontiers in Medicine

Sebastian Fantini¹  Chiara Carretta¹  Sandra Parenti¹  Claudia Alecci²  Tommaso Zanocco-Marani²  Matteo Bertesi²  Alexis Grande²  Carlo Pincelli³  Alessandra Marconi³  Roberta Lotti³  Andrea Martello⁴ 

[1] Department of Life Sciences, Centre for Regenerative Medicine “Stefano Ferrari”, University of Modena and Reggio Emilia, Modena, Italy;Laboratory of Applied Biology, Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy;Laboratory of Cutaneous Biology, Department of Surgical, Medical, Dental and Morphological Sciences, University of Modena and Reggio Emilia, Modena, Italy;University College London, Institute of Ophthalmology London, London, United Kingdom;

关键词: psoriasis;    inflammasome;    methylation;    ZFP36;    NLRP3;   

DOI  :  10.3389/fmed.2020.579383

来源: Frontiers

【 摘 要 】

The mRNA-destabilizing protein tristetraprolin (TTP), encoded by the ZFP36 gene, is known to be able to end inflammatory responses by directly targeting and destabilizing mRNAs encoding pro-inflammatory cytokines. We analyzed its role in psoriasis, a disease characterized by chronic inflammation. We observed that TTP is downregulated in fibroblasts deriving from psoriasis patients compared to those deriving from healthy individuals and that psoriatic fibroblasts exhibit abnormal inflammasome activity compared to their physiological counterpart. This phenomenon depends on TTP downregulation. In fact, following restoration, TTP is capable of directly targeting for degradation NLRP3 mRNA, thereby drastically decreasing inflammasome activation. Moreover, we provide evidence that ZFP36 undergoes methylation in psoriasis, by virtue of the presence of long stretches of CpG dinucleotides both in the promoter and the coding region. Besides confirming that a perturbation of TTP expression might underlie the pathogenesis of psoriasis, we suggest that deregulated inflammasome activity might play a role in the disease alongside deregulated cytokine expression.

【 授权许可】

CC BY