Abstract
The fundamental requirement of every gametocytocidal drug screening assay is the sufficient numbers of healthy and viable gametocytes. The number of in vitro gametocytes grossly depends on the genetic capacity of parasites to produce gametocytes and on various environmental factors that are not precisely elucidated. In the present study, we tested multiple environmental factors that are reported, hypothesized, or predicted to influence gametocyte numbers. We observed that hypoxanthine and the use of freshly drawn human blood significantly enhance gametocytemia (p < 0.05) in vitro. However, other tested factors did not significantly affect gametocytemia. The addition of N-acetyl glucosamine to the culture enriched the gametocytes but d-sorbitol (5% v/v) in amounts and duration of incubation tested was unable to do so without negatively affecting the maturity and health of the gametocytes. Although the in vitro gametocyte production depends on the genetic capability of the parasite strain tested, various environmental factors also control the ability of the strain to produce gametocytes up to a certain extent. This is the first study testing the role of various environmental factors that might affect the gametocyte development in a gametocyte producing strain. The results presented herein will help in the optimization of gametocyte production procedures for various gametocytocidal drug screening assays.
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Acknowledgements
We acknowledge the staff of Malaria Parasite Bank (ICMR-NIMR, New Delhi) for providing technical support. IW was supported by University Grants Commission and ND by Women Scientist Scheme-A, Department of Science and Technology, Government of India. Director ICMR-NIMR is acknowledged for infrastructural and administrative support.
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IW, AS, and MN have contributed to the study conception and design. Material preparation, data collection and analysis were performed by IW, ND, and AS. The first draft of the manuscript was written by IW. All authors read and approved the final manuscript.
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Wadi, I., Deora, N., Nath, M. et al. Investigation of factors affecting the production of P. falciparum gametocytes in an Indian isolate. 3 Biotech 11, 55 (2021). https://doi.org/10.1007/s13205-020-02586-7
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DOI: https://doi.org/10.1007/s13205-020-02586-7