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High-density lipoprotein-mediated lysis of trypanosomes
S L Hajduk1, K Hager, J D Esko
1Department of Biochemistry, the University of Alabama at Birmingham, School of Medicine, Birmingham, AL 35294, USA.
Parasitology Today (Personal Ed.)
|March 1, 1992
Summary
Human serum contains a high-density lipoprotein (HDL) that acts as a trypanosome lytic factor (TLF), killing African trypanosomes. Understanding this innate immunity mechanism could lead to new methods for controlling bovine trypanosomiasis.
Area of Science:
- Immunology
- Parasitology
- Biochemistry
Background:
- African trypanosomes are pathogenic protozoa responsible for significant livestock losses.
- Human serum possesses innate immunity against certain trypanosome species, a phenomenon known for nearly a century.
- The precise mechanism of this trypanocidal activity has remained elusive.
Purpose of the Study:
- To identify the innate trypanocidal factor in human serum.
- To elucidate the mechanism by which this factor lyses trypanosomes.
- To explore the potential of this factor for controlling bovine trypanosomiasis.
Main Methods:
- Biochemical characterization of the trypanosome lytic factor (TLF).
- Analysis of the interaction between TLF and African trypanosomes.
- Investigating the cellular uptake and intracellular fate of TLF.
Main Results:
- Evidence suggests TLF is a specific subclass of human high-density lipoprotein (HDL).
- TLF activity is crucial in restricting the host range of Trypanosoma brucei brucei.
- A proposed lysis mechanism involves TLF binding, endocytosis, and lysosomal targeting.
Conclusions:
- Human HDL is identified as the primary trypanosome lytic factor (TLF).
- Understanding TLF's mechanism offers insights into innate immunity against trypanosomes.
- Harnessing TLF could provide a novel strategy for managing bovine trypanosomiasis.