title: Effect of short-term hyperglycemia on protein kinase C alpha activation in human erythrocytes.
abstract: BACKGROUND
  Diabetes mellitus, characterized by chronic hyperglycemia, is known to have a deleterious effect on erythrocyte structure and hemodynamic characteristics, which eventually contribute to diabetes-associated vascular complications. Protein kinase C alpha (PKCα) is a major regulator of many metabolic processes and structural changes in erythrocytes, and may play a significant role in the development of hyperglycemia-mediated cellular abnormalities.
  
  
  OBJECTIVE
  We hypothesized that acute hyperglycemic stress may affect erythrocyte structure and metabolic properties through its effect on PKCα membrane content and activity.
  
  
  RESULTS
  Erythrocytes, from healthy individuals acutely exposed to a glucose enriched media, showed a significant decrease in the membranous fraction of PKCα and its phosphorylation (p = 0.005 and p = 0.0004, respectively). These alterations correlated with decreased affinity of PKCα to its membrane substrates (4.1R and GLUT1) and reduced RBC deformability (p = 0.017). Pre-activation of erythrocytes with PKC activator, PMA, minimized the effect of glucose on the membrane PKCα fraction and RBC deformability (p > 0.05).
  
  
  CONCLUSIONS
  Acute glycemia-induced inhibition of PKCα membranous translocation and activation is associated with reduced erythrocyte membrane deformability.
authors: The Diabetes Research Center, Hadassah Hebrew University Medical Center, Jerusalem, Israel. leonidlivshts@gmail.com
authors: Leonid
authors: L
authors: Livshits
authors: Ariel
authors: A
authors: Srulevich
authors: Itamar
authors: I
authors: Raz
authors: Avivit
authors: A
authors: Cahn
authors: Gregory
authors: G
authors: Barshtein
authors: Shaul
authors: S
authors: Yedgar
authors: Roy
authors: R
authors: Eldor
mesh_terms: D004789:Enzyme Activation; D004910:Erythrocyte Membrane / Q000201:enzymology* / Q000648:ultrastructure; D005260:Female; D006801:Humans; D006943:Hyperglycemia / Q000097:blood* / Q000201:enzymology*; D015151:Immunoblotting; D008297:Male; D008875:Middle Aged; D051571:Protein Kinase C-alpha / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D051571:Protein Kinase C-alpha; D013755:Tetradecanoylphorbol Acetate
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