Autophagic Flux Detection: Significance and Methods Involved

细胞生物学 自噬 细胞器 袋3 焊剂(冶金) 化学 自噬体 免疫印迹 生物 生物化学 细胞凋亡 基因 有机化学
作者
Xiaowei Zhang,Xiaoxi Lv,Ji‐Chao Zhou,Cai‐Cai Jin,Luyao Qiao,Zhuowei Hu
出处
期刊:Advances in Experimental Medicine and Biology [Springer Nature]
卷期号:: 131-173 被引量:13
标识
DOI:10.1007/978-981-16-2830-6_9
摘要

Macroautophagy is an important biological process in eukaryotic cells by which longevity proteins, misfolded proteins, and damaged organelles are degraded. The autophagy process consists of three key steps: (1) the formation of autophagosomes; (2) the fusion of the autophagosomes with lysosomes; and (3) the degradation of the contents of autolysosomes. If any of the three steps is impaired, autophagy will not be able to complete its biological function. Dysfunctional or blocked autophagy is closely involved in the pathogenesis of a variety of diseases. The accurate determination of the autophagy activity in vivo and in vitro has become a challenge in the field of autophagy research. At present, the most widely used detection method to determine autophagy activity in mammalian cells is to quantify LC3B in the cells by Western blot, or to observe the formation and changes of autophagosomes and autolysosomes by immunofluorescence and electron microscopy. However, ignoring the dynamic characteristics of autophagy and only evaluating the number of autophagosomes or the presence of LC3B cannot completely reflect the activation or a blockage of the autophagy system, and objectively analyze its real role in the occurrence and development of a disease. For example, the accumulation of autophagosomes and autolysosomes can occur through an increase in substrate to be degraded after the activation of autophagy, or it may be caused by the partial obstruction or blockage of autophagy. In this chapter, new and familiar ways to detect the autophagic flux are methodically summarized to provide researchers with a multi-angled viewpoint.
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