title: [Sickle cell pathophysiology].
abstract: Sickle cell disease is associated with the inversion of one base pair (A = T → A = T). The sixth codon of the beta globin chain [GAA] becomes [GTA]. Accordingly, the sixth amino acid (glutamic acid, negatively charged) is replaced by valine, hydrophobic. A hydrophobic site is present on the outside of the HbS β chain. This incurs a hydrophobic bond with the phenylalanine in position 85 and leucine in position 88, in which outsource deoxy haemoglobin. Therefore, it creates a HbS polymer that deforms the red blood cell and causes vaso-occlusive crisis in the capillary venous pole. In this conventional design, the roles are added to the nitrogen monoxide and vascular tone, the increase in adhesion of red blood cells to the endothelium damage caused by red blood cells HbS: dehydration, senescence, formation of microvesicles. If these advances in our understanding of the pathophysiology have not yet had a clinical application, they will happen one day. It is therefore particularly important to pursue in France the network structure of sickle cell disease with a view to set up multicenter trials when the day comes.
authors.affiliation: ARS Lorraine, 4, rue Piroux, CO 80071, 54036 Nancy cedex, France. Electronic address: philippe.renaudier@ars.sante.fr.
authors.forename: P
authors.initials: P
authors.lastname: Renaudier
mesh_terms: D019943:Amino Acid Substitution; D000755:Anemia, Sickle Cell / Q000473:pathology / Q000503:physiopathology*; D002448:Cell Adhesion; D048430:Cell Shape; D004730:Endothelium, Vascular / Q000473:pathology; D004905:Erythrocyte Aging; D004913:Erythrocytes, Abnormal / Q000648:ultrastructure; D006451:Hemoglobin, Sickle / Q000737:chemistry / Q000235:genetics; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D010146:Pain / Q000209:etiology; D057049:Thrombotic Microangiopathies / Q000209:etiology / Q000503:physiopathology; D055544:beta-Globins / Q000737:chemistry / Q000235:genetics
chemical_list: D006451:Hemoglobin, Sickle; D055544:beta-Globins
keywords: Blood transfusion; Drépanocytose; Hemovigilance; Hémovigilance; Pathophysiology; Physiopathologie; Sickle cell disease; Transfusion