CRIF1 Deficiency Induces p66shc-Mediated Oxidative Stress and Endothelial Activation

• Published in: PloS one Vol. 9; no. 6; p. e98670
• Main Authors: Nagar, Harsha, Jung, Saet-byel, Kwon, Sun Kwan, Park, Jung-Bum, Shong, Minho, Song, Hee-Jung, Jeon, Byeong Hwa, Irani, Kaikobad, Kim, Cuk-Seong
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 06.06.2014; Public Library of Science (PLoS)
• Subjects: Activation; Adhesion; Aging; Animals; Atherosclerosis; Cardiovascular disease; Cardiovascular diseases; Cell Adhesion; Cell adhesion & migration; Cell adhesion molecules; Cell cycle; Cell Cycle Proteins - deficiency; Cell Cycle Proteins - genetics; Diabetes; Endocrinology; Endoplasmic reticulum; Endoplasmic Reticulum Stress; Endothelial cells; Endothelial Cells - cytology; Endothelial Cells - metabolism; Gene Knockdown Techniques; Heart diseases; Heat shock proteins; Hospitals; Human Umbilical Vein Endothelial Cells - cytology; Humans; Hyperpolarization; Immunoglobulins; Kinases; Mammals; Medicine; Medicine and Health Sciences; Membrane potential; Mice; Mitochondria; Mitochondria - metabolism; Monocytes; Monocytes - cytology; Nuclear Proteins - deficiency; Nuclear Proteins - genetics; Oxidative Phosphorylation; Oxidative Stress; Phosphorylation; Physiology; Proteins; Reactive Oxygen Species - metabolism; Respiration; Shc Signaling Adaptor Proteins - metabolism; Signal transduction; Src Homology 2 Domain-Containing, Transforming Protein 1; Stress proteins; Vascular cell adhesion molecule 1; Vascular Cell Adhesion Molecule-1 - metabolism; United States > US; South Korea; Iowa City Iowa
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0098670

Mitochondrial dysfunction has been implicated in the pathophysiology of various cardiovascular diseases. CRIF1 is a protein present in the mitochondria associated with large mitoribosomal subunits, and CRIF1 knockdown induces mitochondrial dysfunction and promotes ROS production. p66shc is a redox enzyme implicated in mitochondrial ROS generation and translation of oxidative signals and, therefore, is a key factor for oxidative stress in endothelial cells. In this study, we investigated whether mitochondrial dysfunction induced by CRIF1 knockdown induces p66shc stimulation and plays any role in mitochondrial dysfunction-induced endothelial activation. Knockdown of CRIF1 decreased the expression of mitochondrial oxidative phosphorylation (OXPHOS) complexes I, III and IV, leading to increased mitochondrial ROS (mtROS) and hyperpolarization of the mitochondrial membrane potential. Knockdown of CRIF1 also stimulated phosphorylation of p66shc and increased cytosolic ROS in endothelial cells. Furthermore, the expression of vascular cell adhesion molecule-1 and endoplasmic reticulum stress proteins were increased upon CRIF1 knockdown in endothelial cells. However, p66shc knockdown blunted the alteration in mitochondrial dynamics and ROS production in CRIF1 knockdown endothelial cells. In addition, p66shc knockdown reduced the CRIF1 knockdown-induced increases in adhesion between monocytes and endothelial cells. Taken together, these results suggest that CRIF1 knockdown partially induces endothelial activation via increased ROS production and phosphorylation of p66shc.