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Use of Shigella flexneri to Study Autophagy-Cytoskeleton Interactions
Published on: September 9, 2014
Host-pathogen interactions and subversion of autophagy
1Division of Cell Signalling and Immunology, School of Life Sciences, University of Dundee, Dundee, U.K. d.g.mcewan@dundee.ac.uk.
Abstract:
Macroautophagy ('autophagy'), is the process by which cells can form a double-membraned vesicle that encapsulates material to be degraded by the lysosome. This can include complex structures such as damaged mitochondria, peroxisomes, protein aggregates and large swathes of cytoplasm that can not be processed efficiently by other means of degradation. Recycling of amino acids and lipids through autophagy allows the cell to form intracellular pools that aid survival during periods of stress, including growth factor deprivation, amino acid starvation or a depleted oxygen supply. One of the major functions of autophagy that has emerged over the last decade is its importance as a safeguard against infection. The ability of autophagy to selectively target intracellular pathogens for destruction is now regarded as a key aspect of the innate immune response. However, pathogens have evolved mechanisms to either evade or reconfigure the autophagy pathway for their own survival. Understanding how pathogens interact with and manipulate the host autophagy pathway will hopefully provide a basis for combating infection and increase our understanding of the role and regulation of autophagy. Herein, we will discuss how the host cell can identify and target invading pathogens and how pathogens have adapted in order to evade destruction by the host cell. In particular, we will focus on interactions between the mammalian autophagy gene 8 (ATG8) proteins and the host and pathogen effector proteins.
Insights
Autophagy is a cellular process crucial for survival during stress and a key part of the innate immune response against pathogens. Understanding how pathogens manipulate autophagy is vital for developing new infection treatments.
Area of Science:
- Cell Biology
- Immunology
- Microbiology
Background:
- Macroautophagy (autophagy) is a cellular degradation process involving double-membraned vesicles targeting cellular components like damaged organelles and protein aggregates.
- Autophagy plays a critical role in cellular survival during stress conditions such as nutrient deprivation and hypoxia.
- A significant function of autophagy is its role in innate immunity, enabling the host cell to eliminate intracellular pathogens.
Purpose of the Study:
- To explore how host cells identify and target invading pathogens via autophagy.
- To investigate the mechanisms employed by pathogens to evade or manipulate the host autophagy pathway.
- To understand the interactions between mammalian autophagy gene 8 (ATG8) proteins and host/pathogen effector proteins.
Main Methods:
- Review and synthesis of current literature on autophagy and host-pathogen interactions.
- Focus on the molecular mechanisms of pathogen recognition and targeting by autophagy.
- Analysis of pathogen strategies for evading autophagy, including effector protein interactions.
Main Results:
- Autophagy is a critical defense mechanism against intracellular pathogens.
- Pathogens have evolved sophisticated strategies to subvert the host autophagy machinery for their own benefit.
- Specific interactions between ATG8 proteins and host/pathogen effectors are central to this cellular battle.
Conclusions:
- Understanding pathogen manipulation of autophagy is essential for developing novel anti-infective strategies.
- Targeting the interplay between ATG8 proteins and effector proteins offers potential therapeutic avenues.
- Further research into autophagy regulation and pathogen interactions will enhance our knowledge of both cellular processes and infection control.
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