title: An inhibition of p38 mitogen activated protein kinase delays the platelet storage lesion.
abstract: OBJECTIVE
  Platelets during storage undergo diverse alterations collectively known as the platelet storage lesion, including metabolic, morphological, functional and structural changes. Some changes correlate with activation of p38 mitogen activated protein kinase (p38 MAPK). Another MAPK, extracellular signal-related kinase (ERK), is involved in PLT activation. The aim of this study was to compare the properties of platelets stored in plasma in the presence or absence of p38 and ERK MAPK inhibitors.
  
  
  METHODS
  A single Trima apheresis platelet unit (n = 12) was aliquoted into five CLX storage bags. Two aliquots were continuously agitated with or without MAPK inhibitors. Two aliquots were subjected to 48 hours of interruption of agitation with or without MAPK inhibitors. One aliquot contained the same amount of solvent vehicle used to deliver the inhibitor. Platelets were stored at 20-24°C for 7 days and sampled on Days 1, 4, and 7 for 18 in vitro parameters.
  
  
  RESULTS
  Inhibition of p38 MAPK by VX-702 leads to better maintenance of all platelet in vitro storage parameters including platelet mitochondrial function. Accelerated by interruption of agitation, the platelet storage lesion of units stored with VX-702 was diminished to that of platelets stored with continuous agitation. Inhibition of ERK MAPK did not ameliorate decrements in any in vitro platelet properties.
  
  
  CONCLUSIONS
  Signaling through p38 MAPK, but not ERK, is associated with platelet deterioration during storage.
authors: American Red Cross Biomedical Services, Holland Laboratory, Rockville, Maryland, USA. Andrey.Skripchenko@redcross.org
authors: Andrey
authors: A
authors: Skripchenko
authors: Helen
authors: H
authors: Awatefe
authors: Dedeene
authors: D
authors: Thompson-Montgomery
authors: Andrew
authors: A
authors: Myrup
authors: Annette
authors: A
authors: Turgeon
authors: Stephen J
authors: SJ
authors: Wagner
mesh_terms: D001792:Blood Platelets / Q000187:drug effects* / Q000378:metabolism*; D006801:Humans; D010671:Phenylurea Compounds / Q000494:pharmacology; D047428:Protein Kinase Inhibitors / Q000494:pharmacology*; D012307:Risk Factors; D013048:Specimen Handling; D013997:Time Factors; D048051:p38 Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors* / Q000378:metabolism*
chemical_list: D010671:Phenylurea Compounds; D047428:Protein Kinase Inhibitors; C517771:VX 702; D048051:p38 Mitogen-Activated Protein Kinases
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