Autophagosome–Lysosome Fusion

A special issue of Cells (ISSN 2073-4409). This special issue belongs to the section "Autophagy".

Deadline for manuscript submissions: closed (15 September 2023) | Viewed by 4517

Special Issue Editor


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Guest Editor
Lysosomal and Rare Disorders Research and Treatment Center, Faitfax, VA 22030, USA
Interests: lysosomal storage disorders; autophagy–lysosomal pathway; sphingolipids metabolism; biomarkers
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The autophagy–lysosomal pathway (ALP) is a cellular clearance pathway essential for organelle turnover, clearance of unwanted molecules and proteins, and energy homeostasis. Autophagosome–lysosome fusion is the formation of hybrid organelles when autophagosomes fuse with lysosomes to degrade components in the cytoplasm. Failure at any of these steps sets off a cascade of events that lead to tissue degeneration, genomic instability, cancer, and the inhibition of immune defense against infections. Impaired ALP is associated with a variety of diseases, including lysosomal storage disorders, neurodegenerative diseases, cancer, muscular disorders, cardio, kidney diseases, and pathogen infections.

This research topic focuses on the current understanding of molecular mechanisms of ALP and outlines autophagy-specific lysosomal research in the pathogenesis of diseases. Publications related to new biomarkers and novel therapies highlighting ALP as a therapeutic target are welcome.

We encourage authors to submit original research articles, clinical cases, and reviews that will increase our understanding of the cellular mechanisms underlying the role of lysosomes in autophagy in general and diseases. We also encourage undergraduate and graduate students and postdoctoral trainees to write reviews.

Potential topics include, but are not limited to:

  • Omics approaches to study autophagy and lysosomes;
  • Imaging approaches to study the dynamic of autophagy and lysosomes;
  • Lysosomal enzymes;
  • Chemical modulators of autophagy and lysosomes as a novel therapeutic target;
  • Physiology and mechanisms of autophagosome formation;
  • Autophagy and proteostasis;
  • Autophagy and aging, cancer, and neurodegenerative diseases;
  • Lysosomal storage diseases;
  • Selective autophagy (mitophagy, endosomal microautophagy);
  • Autophagy and model organisms;
  • Autophagy or lysosomal biomarkers as a diagnostic tool.

Dr. Margarita Ivanova
Guest Editor

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Keywords

  • autophagy
  • lysosome
  • cancer
  • neurodegenerative diseases

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Published Papers (2 papers)

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Research

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16 pages, 2830 KiB  
Article
Signal-Retaining Autophagy Indicator as a Quantitative Imaging Method for ER-Phagy
by Natalia Jimenez-Moreno, Carla Salomo-Coll, Laura C. Murphy and Simon Wilkinson
Cells 2023, 12(8), 1134; https://doi.org/10.3390/cells12081134 - 11 Apr 2023
Cited by 1 | Viewed by 2407
Abstract
Autophagy is an intracellular lysosomal degradation pathway by which cytoplasmic cargoes are removed to maintain cellular homeostasis. Monitoring autophagy flux is crucial to understand the autophagy process and its biological significance. However, assays to measure autophagy flux are either complex, low throughput or [...] Read more.
Autophagy is an intracellular lysosomal degradation pathway by which cytoplasmic cargoes are removed to maintain cellular homeostasis. Monitoring autophagy flux is crucial to understand the autophagy process and its biological significance. However, assays to measure autophagy flux are either complex, low throughput or not sensitive enough for reliable quantitative results. Recently, ER-phagy has emerged as a physiologically relevant pathway to maintain ER homeostasis but the process is poorly understood, highlighting the need for tools to monitor ER-phagy flux. In this study, we validate the use of the signal-retaining autophagy indicator (SRAI), a fixable fluorescent probe recently generated and described to detect mitophagy, as a versatile, sensitive and convenient probe for monitoring ER-phagy. This includes the study of either general selective degradation of the endoplasmic reticulum (ER-phagy) or individual forms of ER-phagy involving specific cargo receptors (e.g., FAM134B, FAM134C, TEX264 and CCPG1). Crucially, we present a detailed protocol for the quantification of autophagic flux using automated microscopy and high throughput analysis. Overall, this probe provides a reliable and convenient tool for the measurement of ER-phagy. Full article
(This article belongs to the Special Issue Autophagosome–Lysosome Fusion)
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Review

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16 pages, 2387 KiB  
Review
Nanomaterials Respond to Lysosomal Function for Tumor Treatment
by Xuexia Tian, Anhua Shi, Hang Yin, Yutian Wang, Qiaoyan Liu, Wenling Chen and Junzi Wu
Cells 2022, 11(21), 3348; https://doi.org/10.3390/cells11213348 - 24 Oct 2022
Cited by 5 | Viewed by 1674
Abstract
The safety and efficacy of tumor treatment are difficult problems to address. Recently, lysosomes have become an important target for tumor treatment because of their special environment and function. Nanoparticles have unique physicochemical properties which have great advantages in tumor research. Therefore, in [...] Read more.
The safety and efficacy of tumor treatment are difficult problems to address. Recently, lysosomes have become an important target for tumor treatment because of their special environment and function. Nanoparticles have unique physicochemical properties which have great advantages in tumor research. Therefore, in recent years, researchers have designed various types of nanoparticles to treat tumors based on lysosomal function and environment. In this review, we summarize and analyze different perspectives of tumor treatment, including direct destruction of lysosomes or lysosomal escape, drug delivery by nanoparticles, response to endogenous or exogenous stimuli, and the targeting of tumor cells or other cells. We describe the advantages and disadvantages of these approaches as well as the developmental prospects in this field. We hope to provide new ideas for better tumor treatment. Full article
(This article belongs to the Special Issue Autophagosome–Lysosome Fusion)
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