Abstract
An experimental host-parasite association involving BALB/c male mice infected with Plasmodium chabaudi chabaudi was used in order to investigate the influence of the parasite on the sexual physiology and behavior of infected hosts. Infected males displayed complete courtship behavior leading to ejaculation and sired litters on several occasions. A weekly assay of testosterone and corticosterone plasma concentrations revealed a twofold decrease in the testosterone level at 4 and 5 weeks post-injection, during recrudescence. This imbalance was accompanied by a decrease in the overall duration of the social investigation contacts occurring during courtship and by a reduction in the fertilization rate of the infected animals. These physiological perturbations can be regarded as an adaptive response of the host to the recrudescing parasites, which illustrates the rodents’ capacity for regulating the testosterone profiles needed to balance the competing demands of immunity and reproduction.
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Acknowledgements
The authors gratefully acknowledge Elise Le Capitaine for monitoring the tests, Claudy Haussy for her assistance during the steroid assays, and Deborah Kay for revising the manuscript. This work was financed by a grant allocated to M. Barthélémy by the French Educational Ministry of Research and Technology. The authors adhered to the European recommendations (décret no. 87–848) for the care and use of laboratory animals adopted by the French government in October 1987.
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Barthelemy, M., Gabrion, C. & Petit, G. Reduction in testosterone concentration and its effect on the reproductive output of chronic malaria-infected male mice. Parasitol Res 93, 475–481 (2004). https://doi.org/10.1007/s00436-004-1160-2
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DOI: https://doi.org/10.1007/s00436-004-1160-2