血小板
低温保存
血栓弹性成像
全球生产总值
化学
男科
磷脂酰丝氨酸
平均血小板体积
血小板输注
血小板活化
免疫学
医学
生物化学
生物
磷脂
胚胎
膜
细胞生物学
作者
Lauren Waters,Denese C. Marks,Lacey Johnson
摘要
Abstract Background Platelet cryopreservation extends the shelf‐life to at least 2 years. However, platelets are altered during the freeze/thaw process. Downscaling platelet cryopreservation by freezing in tubes would enable rapid screening of novel strategies to improve the quality of cryopreserved platelets (CPPs). The aim of this study was to characterize the effect of freezing conditions on the in vitro phenotype and function of platelets frozen in a low volume compared to standard CPPs. Methods Platelets were prepared for cryopreservation using 5%–6% DMSO and processed using standard protocols or aliquoted into 2 mL tubes. Platelets were hyperconcentrated to 25 mL (standard CPPs) or 200 μL (tubes) before freezing at −80°C ( n = 8). Six insulators/controlled rate freezing containers were used to vary the freezing rate of platelets in tubes. Platelets were thawed, resuspended in plasma, and then assessed by flow cytometry and thromboelastography. Results The use of different insulators for tubes changed the freezing rate of platelets compared to platelets frozen using the standard protocol ( p < .001). However, this had no impact on the recovery of the platelets ( p = .87) or the proportion of platelets expressing GPIbα ( p = .46) or GPVI ( p = .07), which remained similar between groups. A lower proportion of platelets frozen in tubes externalized phosphatidylserine compared to standard CPPs ( p < .001). The clot‐forming ability (thromboelastography) of platelets was similar between groups ( p > .05). Conclusion Freezing platelets in tubes modified the freezing rate and altered some platelet characteristics. However, the functional characteristics remained comparable, demonstrating the feasibility of downscaling platelet cryopreservation for high‐throughput exploratory investigations.
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