Entamoeba Histolytica Infection Dynamics
Summary
Entamoeba histolytica is a unicellular protozoan parasite responsible for amebiasis, a spectrum of disease ranging from asymptomatic intestinal colonisation to invasive colitis and extra-intestinal abscesses. Transmission occurs via ingestion of hardy cysts in contaminated food or water, followed by excystation in the small intestine to release motile trophozoites. These trophozoites may adhere to and traverse the mucosal barrier, secreting lectins and cysteine proteases that modulate host tissues and elicit inflammatory responses. Host defence is orchestrated by innate immune cells, including macrophages that undergo dynamic M1/M2 polarisation and inflammasome activation, and by the composition of the gut microbiota, which can influence susceptibility and outcome. The parasite lifecycle encompasses encystation within the colon, allowing environmental persistence and ongoing transmission. Global burden remains concentrated in regions with limited sanitation, and emerging insights into host–parasite interplay, transmission models and immune modulation inform strategies for diagnostics, treatment and vaccine development.
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Entamoeba Histolytica Infection Dynamics publication trend
The graph below shows the total number of articles in entamoeba histolytica infection dynamics across all publications each year (not limited to Nature Index journals).
Technical terms
Trophozoite: The active, feeding stage of Entamoeba histolytica that invades host tissues and secretes virulence factors.
Cyst: The hardy, transmissible form of the parasite, capable of surviving in the external environment and initiating infection upon ingestion.
Encystation: The developmental process by which trophozoites convert into cysts within the intestinal lumen, ensuring environmental resilience.
Excystation: The reverse developmental process in which ingested cysts release trophozoites in the host’s small intestine.
Macrophage polarisation: The functional differentiation of macrophages into pro-inflammatory (M1) or anti-inflammatory/tissue-repair (M2) phenotypes in response to pathogen-derived signals.
Extracellular vesicles (EVs): Membrane-bound particles secreted by the parasite that carry proteins and nucleic acids to modulate host cell functions and immune responses.
References
- The macrophage polarization in Entamoeba histolytica infection modulation by the C fragment of the intermediate subunit of Gal/GalNAc-inhibitable lectin. Frontiers in Immunology (2024).
- Tetraspanin-enriched microdomains play an important role in pathogenesis in the protozoan parasite Entamoeba histolytica. PLOS Pathogens (2024).
- Using Entamoeba muris To Model Fecal-Oral Transmission of Entamoeba in Mice. mBio (2023).
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