Aging Differentially Affects Axonal Autophagosome Formation and Maturation.

IF 14.6 1区 生物学 Q1 CELL BIOLOGY
Autophagy Pub Date : 2023-12-01 Epub Date: 2023-07-18 DOI:10.1080/15548627.2023.2236485
Heather Tsong, Erika Lf Holzbaur, Andrea Kh Stavoe
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引用次数: 0

Abstract

Misregulation of neuronal macroautophagy/autophagy has been implicated in age-related neurodegenerative diseases. We compared autophagosome formation and maturation in primary murine neurons during development and through aging to elucidate how aging affects neuronal autophagy. We observed an age-related decrease in the rate of autophagosome formation leading to a significant decrease in the density of autophagosomes along the axon. Next, we identified a surprising increase in the maturation of autophagic vesicles in neurons from aged mice. While we did not detect notable changes in endolysosomal content in the distal axon during early aging, we did observe a significant loss of acidified vesicles in the distal axon during late aging. Interestingly, we found that autophagic vesicles were transported more efficiently in neurons from adult mice than in neurons from young mice. This efficient transport of autophagic vesicles in both the distal and proximal axon is maintained in neurons during early aging, but is lost during late aging. Our data indicate that early aging does not negatively impact autophagic vesicle transport nor the later stages of autophagy. However, alterations in autophagic vesicle transport efficiency during late aging reveal that aging differentially impacts distinct aspects of neuronal autophagy.Abbreviations: ACAP3: ArfGAP with coiled-coil, ankyrin repeat and PH domains 3; ARF6: ADP-ribosylation factor 6; ATG: autophagy related; AVs: autophagic vesicles; DCTN1/p150Glued: dynactin 1; DRG: dorsal root ganglia; GAP: GTPase activating protein; GEF: guanine nucleotide exchange factor; LAMP2: lysosomal-associated protein 2; LysoT: LysoTracker; MAP1LC3B/LC3B: microtubule-associated protein 1 light chain 3 beta; MAPK8IP1/JIP1: mitogen-activated protein kinase 8 interacting protein 1; MAPK8IP3/JIP3: mitogen-activated protein kinase 8 interacting protein 3; mCh: mCherry; PE: phosphatidylethanolamine.

衰老对轴索自噬体的形成和成熟有不同的影响。
神经元大自噬/自噬的失调与年龄相关的神经退行性疾病有关。我们比较了原代鼠神经元在发育过程和衰老过程中的自噬体形成和成熟,以阐明衰老如何影响神经元自噬。我们观察到与年龄相关的自噬体形成率下降,导致轴突上自噬体密度显著降低。接下来,我们发现了衰老小鼠神经元中自噬小泡成熟的惊人增加。虽然我们在衰老早期没有检测到远端轴突内溶酶体含量的显著变化,但在衰老晚期,我们确实观察到远端轴突中酸化囊泡的显著损失。有趣的是,我们发现自噬小泡在成年小鼠神经元中的运输效率高于年轻小鼠神经元。这种在远端和近端轴突中的自噬小泡的有效运输在早期衰老期间在神经元中保持,但在晚期衰老期间丢失。我们的数据表明,早期衰老不会对自噬囊泡运输和自噬后期产生负面影响。然而,衰老后期自噬囊泡运输效率的变化表明,衰老对神经元自噬的不同方面有不同的影响。缩写:ACAP3:ArfGAP,具有卷曲线圈、锚蛋白重复序列和PH结构域3;ARF6:ADP核糖基化因子6;ATG:自噬相关;AVs:自噬小泡;DCTN1/p150Glued:dynactin 1;DRG:背根神经节;GAP:GTP酶激活蛋白;GEF:鸟嘌呤核苷酸交换因子;LAMP2:溶酶体相关蛋白2;LysoT:LysoTracker;MAP1LC3B/LC3B:微管相关蛋白1轻链3β;MAPK8IP1/JIP1:丝裂原活化蛋白激酶8相互作用蛋白1;MAPK8IP3/JIP3:丝裂原活化蛋白激酶8相互作用蛋白3;mCh:mCherry;PE:磷脂酰乙醇胺。
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来源期刊
Autophagy
Autophagy 生物-细胞生物学
CiteScore
21.30
自引率
2.30%
发文量
277
审稿时长
1 months
期刊介绍: Autophagy is a peer-reviewed journal that publishes research on autophagic processes, including the lysosome/vacuole dependent degradation of intracellular material. It aims to be the premier journal in the field and covers various connections between autophagy and human health and disease, such as cancer, neurodegeneration, aging, diabetes, myopathies, and heart disease. Autophagy is interested in all experimental systems, from yeast to human. Suggestions for specialized topics are welcome. The journal accepts the following types of articles: Original research, Reviews, Technical papers, Brief Reports, Addenda, Letters to the Editor, Commentaries and Views, and Articles on science and art. Autophagy is abstracted/indexed in Adis International Ltd (Reactions Weekly), EBSCOhost (Biological Abstracts), Elsevier BV (EMBASE and Scopus), PubMed, Biological Abstracts, Science Citation Index Expanded, Web of Science, and MEDLINE.
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