title: Intracellular signal modulation by nanomaterials.
abstract: A thorough understanding of the interactions of nanomaterials with biological systems and the resulting activation of signal transduction pathways is essential for the development of safe and consumer friendly nanotechnology. Here we present an overview of signaling pathways induced by nanomaterial exposures and describe the possible correlation of their physicochemical characteristics with biological outcomes. In addition to the hierarchical oxidative stress model and a review of the intrinsic and cell-mediated mechanisms of reactive oxygen species (ROS) generating capacities of nanomaterials, we also discuss other oxidative stress dependent and independent cellular signaling pathways. Induction of the inflammasome, calcium signaling, and endoplasmic reticulum stress are reviewed. Furthermore, the uptake mechanisms can be of crucial importance for the cytotoxicity of nanomaterials and membrane-dependent signaling pathways have also been shown to be responsible for cellular effects of nanomaterials. Epigenetic regulation by nanomaterials, effects of nanoparticle-protein interactions on cell signaling pathways, and the induction of various cell death modalities by nanomaterials are described. We describe the common trigger mechanisms shared by various nanomaterials to induce cell death pathways and describe the interplay of different modalities in orchestrating the final outcome after nanomaterial exposures. A better understanding of signal modulations induced by nanomaterials is not only essential for the synthesis and design of safer nanomaterials but will also help to discover potential nanomedical applications of these materials. Several biomedical applications based on the different signaling pathways induced by nanomaterials are already proposed and will certainly gain a great deal of attraction in the near future.
authors.affiliation: Clinical Research Program, National Institute of Environmental Health Sciences (NIEHS), National Institute of Health (NIH), Research Triangle Park, NC, USA, salik.hussain@nih.gov.
authors.forename: Salik
authors.initials: S
authors.lastname: Hussain
authors.forename: Stavros
authors.initials: S
authors.lastname: Garantziotis
authors.forename: Fernando
authors.initials: F
authors.lastname: Rodrigues-Lima
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Dupret
authors.forename: Armelle
authors.initials: A
authors.lastname: Baeza-Squiban
authors.forename: Sonja
authors.initials: S
authors.lastname: Boland
mesh_terms: D000818:Animals; D016923:Cell Death / Q000187:drug effects; D006801:Humans; D042541:Intracellular Space / Q000378:metabolism*; D049329:Nanostructures / Q000737:chemistry / Q000633:toxicity*; D018384:Oxidative Stress / Q000187:drug effects / Q000502:physiology; D011485:Protein Binding; D011506:Proteins / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects*
chemical_list: D011506:Proteins