Philips Charlot, Terrie Lisanne, Muylle Ewout, Thorrez Lieven
Tissue Engineering Lab, Department of Development and Regeneration, KU Leuven Campus Kulak, 8500 Kortrijk, Belgium.
Regen Biomater. 2024 Oct 24;11:rbae123. doi: 10.1093/rb/rbae123. eCollection 2024.
Decellularized organs and tissues are emerging within the field of regenerative medicine to meet the growing demand for organ and tissue transplantation. Quality control of these acellular matrices prior to transplantation is of paramount importance to ensure the absence of an adverse reaction. In particular, thorough evaluation of the DNA content is essential but also poses technical challenges. Therefore, in this study, we compared different methods for quantitative and qualitative evaluation of DNA content in native and decellularized skeletal muscle tissue to identify strengths and weaknesses for each. Histological analysis revealed that Feulgen staining is more sensitive and robust than the commonly used hematoxylin-eosin and 4',6-diamidino-2-phenylindole staining for detection of remaining nuclear material. Furthermore, gel electrophoresis allowed to identify the quality and length of remaining DNA fragments. The results of the quantitative analysis indicated that direct measurement of DNA content in tissue lysates is preferred over silica-based extraction methods, since the latter resulted in the loss of small DNA fragments during extraction. Moreover, a weight loss correction factor should be implemented to take into account the impact of the decellularization on the extracellular matrix. With regard to the detection method, the results revealed that a fluorescence-based approach is more accurate than the use of UV/VIS absorbance. Through combination of the proposed methods, it should be possible to achieve a more standardized evaluation of novel acellular matrices in terms of DNA content and to enhance the predictability of clinical success.
脱细胞化的器官和组织正在再生医学领域崭露头角,以满足对器官和组织移植日益增长的需求。在移植前对这些无细胞基质进行质量控制对于确保不存在不良反应至关重要。特别是,对DNA含量进行全面评估至关重要,但也带来了技术挑战。因此,在本研究中,我们比较了不同方法对天然和脱细胞化骨骼肌组织中DNA含量进行定量和定性评估,以确定每种方法的优缺点。组织学分析表明,对于检测残留核物质,福尔根染色比常用的苏木精-伊红染色和4',6-二脒基-2-苯基吲哚染色更敏感、更可靠。此外,凝胶电泳能够鉴定残留DNA片段的质量和长度。定量分析结果表明,直接测量组织裂解物中的DNA含量优于基于硅胶的提取方法,因为后者在提取过程中导致小DNA片段丢失。此外,应实施失重校正因子以考虑脱细胞化对细胞外基质的影响。关于检测方法,结果表明基于荧光的方法比使用紫外/可见吸光度更准确。通过结合所提出的方法,应该能够在DNA含量方面对新型无细胞基质实现更标准化的评估,并提高临床成功的可预测性。