Jóhannsson Freyr, Yurkovich James T, Guðmundsson Steinn, Sigurjónsson Ólafur E, Rolfsson Óttar
Center for Systems Biology, University of Iceland, Sturlugata 8, 102 Reykjavik, Iceland.
School of Health Sciences, Medical Department, University of Iceland, Sturlugata 8, 102 Reykjavik, Iceland.
Metabolites. 2024 Jan 26;14(2):91. doi: 10.3390/metabo14020091.
Temperature plays a fundamental role in biology, influencing cellular function, chemical reaction rates, molecular structures, and interactions. While the temperature dependence of many biochemical reactions is well defined in vitro, the effect of temperature on metabolic function at the network level is poorly understood, and it remains an important challenge in optimizing the storage of cells and tissues at lower temperatures. Here, we used time-course metabolomic data and systems biology approaches to characterize the effects of storage temperature on human platelets (PLTs) in a platelet additive solution. We observed that changes to the metabolome with storage time do not simply scale with temperature but instead display complex temperature dependence, with only a small subset of metabolites following an Arrhenius-type relationship. Investigation of PLT energy metabolism through integration with computational modeling revealed that oxidative metabolism is more sensitive to temperature changes than glycolysis. The increased contribution of glycolysis to ATP turnover at lower temperatures indicates a stronger glycolytic phenotype with decreasing storage temperature. More broadly, these results demonstrate that the temperature dependence of the PLT metabolic network is not uniform, suggesting that efforts to improve the health of stored PLTs could be targeted at specific pathways.
温度在生物学中起着基础性作用,影响细胞功能、化学反应速率、分子结构及相互作用。虽然许多生化反应的温度依赖性在体外已得到充分界定,但温度对网络层面代谢功能的影响却知之甚少,并且在优化细胞和组织在低温下的储存方面,这仍然是一项重大挑战。在此,我们使用时间进程代谢组学数据和系统生物学方法,来表征储存温度对血小板添加剂溶液中人类血小板(PLT)的影响。我们观察到,代谢组随储存时间的变化并非简单地与温度成比例,而是呈现出复杂的温度依赖性,只有一小部分代谢物遵循阿伦尼乌斯型关系。通过与计算模型相结合对血小板能量代谢进行研究发现,氧化代谢比糖酵解对温度变化更敏感。在较低温度下糖酵解对ATP周转的贡献增加,表明随着储存温度降低,糖酵解表型更强。更广泛地说,这些结果表明血小板代谢网络的温度依赖性并不均匀,这表明改善储存血小板健康状况的努力可以针对特定途径。
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