title: Regeneration of phosphorylated metabolites in stored erythrocytes in an open perfusion system: studies using 31P NMR spectroscopy.
abstract: Human erythrocytes were maintained at high haematocrit in a metabolically functional state for several hours in a thermodynamically open perfusion apparatus. The concentrations of ATP and 2,3-bisphosphoglycerate (2,3-DPG) and pH were continuously monitored before and after metabolic perturbations by using 31P NMR; the monitoring was achieved with a 31P flow-through probe. Methylphosphonate was added to plasma perfusion medium as a phosphorus concentration standard and as a 31P NMR pH probe molecule. The rates of decline of ATP and 2,3-DPG levels in fresh cells in a glucose-free medium were measured as were the rates of reformation in response to a 'rejuvenation' medium. Also, rates of ATP and 2,3-DPG synthesis during perfusion with Krebs bicarbonate-0.5 mmol/l glucose and perfusion with pooled plasma were measured in cells that had been previously stored at 4 degrees C for 5 weeks.
mesh_terms: D019794:2,3-Diphosphoglycerate; D000255:Adenosine Triphosphate / Q000378:metabolism*; D001793:Blood Preservation; D004163:Diphosphoglyceric Acids / Q000378:metabolism*; D004912:Erythrocytes / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D010477:Perfusion; D013057:Spectrum Analysis; D013997:Time Factors
chemical_list: D004163:Diphosphoglyceric Acids; D019794:2,3-Diphosphoglycerate; D000255:Adenosine Triphosphate