title: [Aggregation after rehydration of lyophilized platelets].
abstract: This study was aimed to investigate the aggregation of rehydrated-lyophilized platelets. The aggregation rate of fresh and rehydrated-lyophilized platelets were measured by using thrombin, ristocetin, ADP and collagen as inductors and APACT2 aggregameter; the effects of intra- and extra-cellular trehalose on maximum aggregation rate of rehydrated-lyophilized platelets were detected by using ADP as an inductor. The results showed that the aggregation rate of fresh platelets was all about 100%, while aggregation rate of rehydrated lyophilized platelets was (70.17 +/- 7.36)%, (15.3 +/- 2.81)%, (68.67 +/- 6.86)%, (64.67 +/- 11.6)% respectively, when the concentration of thrombin, ristocetin, ADP and collagen was 1 U/ml, 1.6 mg/ml, 20 micromol/L and 2 microg/ml. The maximum aggregation rates of rehydrated-lyophilized platelets in intra- and extra-cellular trehalose, extracellular trehalose and blank control groups were (66.0 +/- 4.69)%, (25.3 +/- 2.42)% and (11.5 +/- 1.87)% (P < 0.01), meanwhile there was significant difference of rehydrated-lyophilized platelet aggregation rate between intra- and extra-cellular trehalose and extracellular trehalose groups (P < 0.01). It is concluded that the concentrations of thrombin (1 U/ml), ristocetin (1.6 mg/ml), ADP (20 micromol/L) and collagen (2 microg/ml) are optimal for platelets aggregation tests, the internal and extracellular trehalose significantly enhance the aggregation of rehydrated-lyophilized platelets.
authors.affiliation: Department of Blood Transfusion, Center for Clinical Transfusion Medicine, The General Hospital of Chinese PLA, Beijing, 100853, China. jinghan-liu@301hospital.com.cn
authors.forename: Jing-Han
authors.initials: JH
authors.lastname: Liu
authors.forename: Fa-Qiang
authors.initials: FQ
authors.lastname: Lu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhuang
authors.forename: Ji
authors.initials: J
authors.lastname: Che
authors.forename: Lin-Feng
authors.initials: LF
authors.lastname: Chen
mesh_terms: D001792:Blood Platelets / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D001793:Blood Preservation / Q000379:methods*; D005612:Freeze Drying / Q000379:methods; D006801:Humans; D010974:Platelet Aggregation / Q000502:physiology*