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Updated: Apr 17, 2026
Study of Phagolysosome Biogenesis in Live Macrophages
Published on: March 10, 2014
Detection and quantification of microbial manipulation of phagosomal function
Maria Podinovskaia1, David G Russell2
1Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA; Institut National de la Recherche Scientifique-Institut Armand-Frappier, Laval, QC, Canada.
Abstract:
Macrophages are phagocytic cells that constitute the primary barrier against microbial infection. However, the frequency of this interaction has likely led to the selection and retention of specific strategies to subvert the antimicrobial behavior of these cells. Many intracellular pathogens manipulate their host macrophages, in order to survive, avoid degradation and immune recognition. Much of the antimicrobial defenses mobilized by the macrophage function through the lysosomal compartment and it is the subversion of these mechanisms that are the target of many pathogenic microbes. To investigate the potential manipulation of lysosomal function by infectious agents, the protocols provided here describe a wide range of techniques developed to study various lysosome functions, ranging from phagosome-lysosome fusion to a panel of hydrolytic activities. The suitability of various protocols for specific contexts is addressed. In addition to providing detailed methods for the elucidation of lysosome function and their applications to microbial infections, approaches are also discussed for developing new protocols that would complement our knowledge of microbial manipulation of lysosome functions. The continued technical evolution of these methods is central to increasing our understanding of host-pathogen interactions and cell biology in general.
Insights
Pathogenic microbes often manipulate host macrophages to survive by subverting lysosomal functions. This study details methods to analyze lysosome activity and understand how microbes exploit these cellular defenses.
Area of Science:
- Cell Biology
- Immunology
- Microbiology
Background:
- Macrophages are crucial phagocytic cells defending against microbial infections.
- Intracellular pathogens frequently manipulate host macrophages to evade degradation and immune detection.
- Lysosomal pathways are central to macrophage antimicrobial defenses, making them targets for pathogens.
Purpose of the Study:
- To investigate the manipulation of lysosomal function by infectious agents.
- To provide detailed protocols for studying various lysosome functions in the context of microbial infections.
- To discuss approaches for developing new methods to understand microbial manipulation of lysosomes.
Main Methods:
- Detailed protocols for assessing lysosome functions, including phagosome-lysosome fusion.
- Methods to analyze a panel of hydrolytic activities within lysosomes.
- Discussion on the suitability of protocols for specific experimental contexts.
Main Results:
- The study provides a comprehensive set of techniques for evaluating lysosomal functions relevant to host-pathogen interactions.
- It addresses the application of these methods to understand microbial subversion strategies.
- Approaches for developing novel protocols are also presented.
Conclusions:
- Understanding lysosomal function is critical for comprehending host-pathogen interactions.
- The presented protocols and approaches aid in elucidating how microbes manipulate macrophage lysosomal pathways.
- Continued technical advancements in studying lysosome function are vital for progress in cell biology and infection research.
