title: Electrokinetic properties of human cryopreserved platelets.
abstract: A method for the cryopreservation of human platelets with glycerol/glucose is described which was a simplified modification of the method of Dayian and Pert (1979). The effect of cryoinjury of the platelet surface membrane was investigated by studying the surface electrokinetic properties of the platelet. A significant increase in platelet electrophoretic mobility was found after cryopreservation. The fresh platelets had a mean electrophoretic mobility of 1.04 +/- 0.05 microns s-1 V-1 cm-1 and cryopreserved platelets 1.18 +/- 0.05 microns s-1 V-1 cm-1, P < 0.05. However, the total platelet sialic acid of fresh platelets was 62.5 +/- 5.6 nmol 10(-9) platelets compared to 47.2 +/- 4.6 nmol 10(-9) platelets after cryopreservation, P < 0.001. Similarly, the neuraminidase-labile sialic acid was 26.4 +/- 4.3 nmol 10(-9) platelets for fresh platelets and 17.6 +/- 4.0 nmol 10(-9) platelets after cryopreservation, P < 0.001. Using polyacrylamide gel electrophoresis with Western blotting, we showed a reduction in the platelet glycoprotein Gp Ib after cryopreservation, this was confirmed by using crossed immunoelectrophoresis. Electron microscopy revealed a significant change in platelet morphology after the cryopreservation procedure with disruption of the platelet membrane and also platelet shape change. These features may explain the changes in platelet electrokinetic properties.
authors: North London Blood Transfusion Centre, Colindale, London, U.K.
authors: E A
authors: EA
authors: Bateson
authors: M A
authors: MA
authors: Crook
authors: B
authors: B
authors: Brozovic
authors: N
authors: N
authors: Crawford
mesh_terms: D001792:Blood Platelets / Q000737:chemistry / Q000187:drug effects; D001793:Blood Preservation / Q000379:methods*; D015153:Blotting, Western; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D015925:Cryopreservation / Q000379:methods*; D003451:Cryoprotective Agents / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D005947:Glucose / Q000494:pharmacology; D005990:Glycerol / Q000494:pharmacology; D006801:Humans; D007123:Immunoelectrophoresis, Two-Dimensional; D019158:N-Acetylneuraminic Acid; D009439:Neuraminidase / Q000494:pharmacology; D010980:Platelet Membrane Glycoproteins / Q000032:analysis; D012794:Sialic Acids / Q000032:analysis
chemical_list: D003451:Cryoprotective Agents; D010980:Platelet Membrane Glycoproteins; D012794:Sialic Acids; D009439:Neuraminidase; D019158:N-Acetylneuraminic Acid; D005947:Glucose; D005990:Glycerol