Green Charlotte J, Charlton Catriona A, Wang Lai-Mun, Silva Michael, Morten Karl J, Hodson Leanne
Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), University of Oxford, Churchill Hospital, Headington, Oxford, OX3 7LE, UK.
Department of Cellular Pathology, Oxford University Hospitals, Oxford, UK.
Cell Tissue Bank. 2017 Dec;18(4):597-604. doi: 10.1007/s10561-017-9641-6. Epub 2017 Jul 17.
Two-step perfusion is considered the gold standard method for isolating hepatocytes from human liver tissue. As perfusion may require a large tissue specimen, which is encapsulated and has accessible vessels for cannulation, only a limited number of tissue samples may be suitable. Therefore, the aim of this work was to develop an alternative method to isolate hepatocytes from non-encapsulated and small samples of human liver tissue. Healthy tissue from 44 human liver resections were graded for steatosis and tissue weights between 7.8 and 600 g were used for hepatocyte isolations. Tissue was diced and underwent a two-step digestion (EDTA and collagenase). Red cell lysis buffer was used to prevent red blood cell contamination and toxicity. Isolated hepatocyte viability was determined by trypan blue exclusion. Western blot and biochemical analyses were undertaken to ascertain cellular phenotype and function. Liver tissue that weighed ≥50 g yielded significantly higher (P < 0.01) cell viability than tissue <50 g. Viable cells secreted urea and displayed the phenotypic hepatocyte markers albumin and cytochrome P450. Presence of steatosis in liver tissue or intra-hepatocellular triglyceride content had no effect on cell viability. This methodology allows for the isolation of viable primary human hepatocytes from small amounts of "healthy" resected liver tissue which are not suitable for perfusion. This work provides the opportunity to increase the utilisation of resection surplus tissue, and may ultimately lead to an increased number of in vitro cellular studies being undertaken using the gold-standard model of human primary hepatocytes.
两步灌注法被认为是从人肝组织中分离肝细胞的金标准方法。由于灌注可能需要大的组织标本,该标本需被包裹且有可插管的血管,因此只有有限数量的组织样本可能适用。所以,本研究的目的是开发一种从未包裹的小份人肝组织样本中分离肝细胞的替代方法。对44例人肝切除术的健康组织进行脂肪变性分级,使用重量在7.8至600克之间的组织进行肝细胞分离。将组织切成小块并进行两步消化(乙二胺四乙酸和胶原酶)。使用红细胞裂解缓冲液来防止红细胞污染和毒性。通过台盼蓝排斥法测定分离的肝细胞活力。进行蛋白质免疫印迹和生化分析以确定细胞表型和功能。重量≥50克的肝组织产生的细胞活力显著高于<50克的组织(P<0.01)。活细胞分泌尿素并显示出肝细胞表型标志物白蛋白和细胞色素P450。肝组织中脂肪变性的存在或肝细胞内甘油三酯含量对细胞活力没有影响。这种方法能够从不适用于灌注的少量“健康”切除肝组织中分离出有活力的原代人肝细胞。这项工作为增加切除剩余组织的利用率提供了机会,并最终可能导致使用人原代肝细胞金标准模型进行的体外细胞研究数量增加。