Phagolysosome

Phagolysosome is a cytoplasmic body formed by the fusion of a phagosome with a lysosome in a process that occurs during phagocytosis. This process is crucial for the destruction and digestion of microorganisms that are engulfed by phagocytes.

Formation

The formation of a phagolysosome involves several steps. Initially, the pathogen is engulfed by the phagocyte to form a phagosome. The phagosome then fuses with a lysosome to form a phagolysosome. The lysosome contributes hydrolytic enzymes that help in the digestion of the pathogen.

Function

The main function of the phagolysosome is to degrade the engulfed material. The lysosome provides a range of enzymes that can break down all types of biomolecules, including proteins, nucleic acids, carbohydrates, and lipids. The degradation products are then either used by the cell or expelled.

Clinical significance

Defects in phagolysosome function can lead to various diseases. For example, in Chediak-Higashi syndrome, there is a defect in lysosome transport, which impairs phagolysosome formation. This leads to an increased susceptibility to infections. Similarly, some pathogens have developed strategies to avoid destruction in the phagolysosome, which contributes to their virulence.

See also

• Phagocytosis
• Lysosome
• Phagosome
• Autophagy

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  Phagocytosis process illustration

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  Amino acid transport and phagolysosome resolution