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A method to evaluate the capacity of monocytes and macrophages to inhibit multiplication of an intracellular pathogen
Abstract:
A new method to assess intracellular inhibition of multiplication or killing by normal and activated mouse peritoneal macrophages, human peripheral blood monocytes, and human monocyte-derived macrophages is described. This method involves measurement of incorporation of [3H]uracil into nucleic acids of the obligate intracellular parasite Toxoplasma gondii. The method utilizes the observation by Pfefferkorn and Pfefferkorn (1977) that [3H]uracil is incorporated in substantially greater amounts by T. gondii than by certain mammalian cell types. Differential uptake of [3H]uracil by Toxoplasma-infected and uninfected cultures allows for evaluation of the ability of macrophages or monocytes to inhibit or kill this organism. This method has been adapted to microsystem.
Insights
A novel method quantifies how well macrophages and monocytes inhibit or kill Toxoplasma gondii. This technique measures [3H]uracil incorporation into parasite nucleic acids, offering a sensitive assessment of cellular immunity against this pathogen.
Area of Science:
- Immunology
- Parasitology
- Cell Biology
Background:
- Assessing macrophage and monocyte antimicrobial activity is crucial for understanding host defense against intracellular pathogens.
- Existing methods for evaluating intracellular parasite killing can be complex and time-consuming.
Purpose of the Study:
- To develop and validate a novel, sensitive method for quantifying the intracellular inhibition or killing of Toxoplasma gondii by macrophages and monocytes.
- To adapt this method for use in a microsystem format for increased efficiency.
Main Methods:
- The method relies on the differential incorporation of radiolabeled uracil ([3H]uracil) into the nucleic acids of Toxoplasma gondii compared to host mammalian cells.
- Quantification of [3H]uracil uptake in infected and uninfected macrophage/monocyte cultures allows for assessment of parasite viability and replication.
Main Results:
- The described method effectively differentiates the ability of various macrophage and monocyte populations (mouse peritoneal macrophages, human peripheral blood monocytes, human monocyte-derived macrophages) to inhibit or kill T. gondii.
- The technique demonstrates sensitivity due to the significantly higher [3H]uracil incorporation by T. gondii compared to host cells.
Conclusions:
- This [3H]uracil incorporation assay provides a robust and sensitive tool for evaluating the anti-Toxoplasma activity of phagocytic cells.
- The adaptation to a microsystem format enhances its utility for high-throughput screening and research.