Activation of the dsRNA-activated protein kinase PKR in mitochondrial dysfunction and inflammatory stress in metabolic syndrome

Neetu Sud, Angela C. Rutledge, Kaichao Pan, Qiaozhu Su

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Background: The double stranded RNA (dsRNA)-activated protein kinase PKR is a well-established protein kinase that is activated by dsRNA during viral infection, and it inhibits global protein synthesis by phosphorylating the alpha subunit of eukaryotic initiation factor 2α (eIF2α). Recent studies have greatly broadened the recognized physiological activities of PKR by demonstrating its fundamental role in inflammatory signaling, particularly in chronic, low-grade inflammation induced by metabolic disorders, known as metaflammation. Metaflammation is initiated by the activation of the NOD-like receptor (NLR), leucine-rich repeat, pyrin domaincontaining 3 (NLRP3) gene by mitochondrial reactive oxygen species (ROS). A protein complex defined as the metaflammasome is assembled in the course of metaflammation. This complex integrates nutritional signaling with cellular stress, inflammatory components, and insulin action and is essential in maintaining metabolic homeostasis. PKR is a key constituent of the metaflammasome and interacts directly with several inflammatory kinases, such as inhibitor κB (IκB) kinase (IKK) and c-Jun N-terminal kinase (JNK), insulin receptor substrate 1 (IRS1), and component of the translational machinery such as eIF2α. Conclusion: This review highlights recent findings in PKR-mediated metaflammation and its association with the onset of metabolic syndrome in both human and animal models, with a focus on the molecular and biochemical pathways that underlie the progression of obesity, insulin resistance, and type-2 diabetes.

Original languageEnglish (US)
Pages (from-to)2697-2703
Number of pages7
JournalCurrent Pharmaceutical Design
Volume22
Issue number18
DOIs
StatePublished - May 1 2016

Keywords

  • ER stress
  • Metabolic diseases
  • Metaflammation
  • Mitochondrial dysfunction
  • dsRNA-Activated Protein Kinase PKR

ASJC Scopus subject areas

  • Pharmacology
  • Drug Discovery

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