From mesothelioma to cardiovascular protection via the phosphoinositide-3 kinase pathway: A new vista in cardiothoracic surgery  Igor E. Konstantinov,

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Presentation transcript:

From mesothelioma to cardiovascular protection via the phosphoinositide-3 kinase pathway: A new vista in cardiothoracic surgery  Igor E. Konstantinov, MD, PhD, Jia Li, MD, PhD, Andrew N. Redington, MD  The Journal of Thoracic and Cardiovascular Surgery  Volume 131, Issue 2, Pages 509-510 (February 2006) DOI: 10.1016/j.jtcvs.2005.09.058 Copyright © 2006 The American Association for Thoracic Surgery Terms and Conditions

Figure 1 Schematic of phosphoinositide-3 kinase (PI3K) signaling pathway. Activation of growth factor receptor results in phosphorylation (P) on tyrosine residues. PI3K is activated by binding to tyrosine residues of growth factor receptor with its regulatory subunit (p85). The lipid product of PI3K, phosphadylinositol-3,4,5-triphosphate (PIP3), recruits serine-treonine kinase (Akt) via pleckstrin homology (PH) domain to the membrane, where it is activated. Akt phosphorylation of the apoptosis inducing protein BAD prevents BAD from binding to Bcl-2, thus releasing it for survival response. Direct binding to Ras protein further stimulates PI3K activity. Stimulation of toll-like receptor (TLR) 4 by bacterial lipopolysaccharide (LPS) or heat shock protein (HSP) results in PI3K activation via the myeloid differentiation factor (MyD) 88. Tumor necrosis factor (TNF) produces PI3K/Akt-mediated phosphorylation of p65 subunit of nuclear factor kappaB (NF-κB) via the alpha subunit of IkappaB kinase (IKK). Translocation of NF-kB to the nucleus results in gene expression and systhesis of cytokines, manganese superoxide dismutase (MnSOD), and endothelial nitric oxide synthase (eNOS) that are protective during acute ischemia. The Journal of Thoracic and Cardiovascular Surgery 2006 131, 509-510DOI: (10.1016/j.jtcvs.2005.09.058) Copyright © 2006 The American Association for Thoracic Surgery Terms and Conditions