Abstract
This protocol describes the use of heavy water (2H2O) labeling to determine the growth rate and metabolic state of Leishmania parasites in culture and in infected animals. In vitro labeling studies are undertaken by cultivating defined parasite developmental stages in standard medium supplemented with 5% 2H2O, resulting in the incorporation of deuterium (2H) into a range of metabolic precursors used in macromolecule (DNA, RNA, protein, lipid, and glycan) synthesis. The rate of turnover of different parasite macromolecules can subsequently be determined by analysis of deuterium enrichment in the different constituents of these macromolecules by gas chromatography–mass spectrometry (GC-MS). To measure the growth rate and physiological state of parasite stages in lesion tissue, infected mice were provided with 9% 2H2O in their drinking water for various periods of time and 2H-enrichment in the macromolecular constituents of isolated lesion-derived parasite stages determined by GC-MS. This protocol provides quantitative information on key cellular processes, such as replication (DNA turnover), transcription (RNA turnover), translation (protein turnover), membrane biogenesis (lipid turnover), and central carbon metabolism (glycan turnover) that define the growth state and phenome of different parasite stages in vitro and in vivo. This approach can be used to assess the impact of host immune responses on parasite growth and physiology (using different Leishmania strains/species, mouse lines), characterize different parasite populations during chronic and acute infections, and assess parasite responses to drug treatments. It is also broadly applicable to other microbial pathogens.
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Acknowledgments
This work was supported by the Australian National Health and Medical Research Council (NHMRC Project Grant APP1100000). M.J.M. is an NHMRC Principal Research Fellow.
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Kloehn, J., McConville, M.J. (2020). Analysis of the Physiological and Metabolic State of Leishmania Using Heavy Water Labeling. In: Michels, P., Ginger, M., Zilberstein, D. (eds) Trypanosomatids. Methods in Molecular Biology, vol 2116. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-0294-2_35
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DOI: https://doi.org/10.1007/978-1-0716-0294-2_35
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