ZFP36 protects lungs from intestinal I/R-induced injury and fibrosis through the CREBBP/p53/p21/Bax pathway

Cell Death Dis. 2021 Jul 8;12(7):685. doi: 10.1038/s41419-021-03950-y.

Abstract

Acute lung injury induced by ischemia-reperfusion (I/R)-associated pulmonary inflammation is associated with high rates of morbidity. Despite advances in the clinical management of lung disease, molecular therapeutic options for I/R-associated lung injury are limited. Zinc finger protein 36 (ZFP36) is an AU-rich element-binding protein that is known to suppress the inflammatory response. A ZFP36 binding site occurs in the 3' UTR of the cAMP-response element-binding protein (CREB) binding protein (CREBBP) gene, which is known to interact with apoptotic proteins to promote apoptosis. In this study, we investigate the involvement of ZFP36 and CREBBP on I/R-induced lung injury in vivo and in vitro. Intestinal ischemia/reperfusion (I/R) activates inflammatory responses, resulting in injury to different organs including the lung. Lung tissues from ZFP36-knockdown mice and mouse lung epithelial (MLE)-2 cells were subjected to either Intestinal I/R or hypoxia/reperfusion, respectively, and then analyzed by Western blotting, immunohistochemistry, and real-time PCR. Silico analyses, pull down and RIP assays were used to analyze the relationship between ZFP36 and CREBBP. ZFP36 deficiency upregulated CREBBP, enhanced I/R-induced lung injury, apoptosis, and inflammation, and increased I/R-induced lung fibrosis. In silico analyses indicated that ZFP36 was a strong negative regulator of CREBBP mRNA stability. Results of pull down and RIP assays confirmed that ZFP36 direct interacted with CREBBP mRNA. Our results indicated that ZFP36 can mediate the level of inflammation-associated lung damage following I/R via interactions with the CREBBP/p53/p21/Bax pathway. The downregulation of ZFP36 increased the level of fibrosis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acute Lung Injury / etiology
  • Acute Lung Injury / metabolism
  • Acute Lung Injury / pathology
  • Acute Lung Injury / prevention & control*
  • Animals
  • Apoptosis
  • CREB-Binding Protein / genetics
  • CREB-Binding Protein / metabolism*
  • Cell Line
  • Cyclin-Dependent Kinase Inhibitor p21 / metabolism*
  • Cytokines / metabolism
  • Disease Models, Animal
  • Epithelial-Mesenchymal Transition
  • Inflammation Mediators / metabolism
  • Intestines / blood supply*
  • Lung / metabolism*
  • Lung / pathology
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Pulmonary Fibrosis / etiology
  • Pulmonary Fibrosis / metabolism
  • Pulmonary Fibrosis / pathology
  • Pulmonary Fibrosis / prevention & control*
  • Reperfusion Injury / complications*
  • Signal Transduction
  • Tristetraprolin / genetics
  • Tristetraprolin / metabolism*
  • Tumor Suppressor Protein p53 / metabolism*
  • bcl-2-Associated X Protein / metabolism*

Substances

  • Bax protein, mouse
  • Cdkn1a protein, mouse
  • Cyclin-Dependent Kinase Inhibitor p21
  • Cytokines
  • Inflammation Mediators
  • Tristetraprolin
  • Trp53 protein, mouse
  • Tumor Suppressor Protein p53
  • Zfp36 protein, mouse
  • bcl-2-Associated X Protein
  • CREB-Binding Protein
  • Crebbp protein, mouse