Enhanced transmission of malaria parasites to mosquitoes in a murine model of type 2 diabetes

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Abstract

Background: More than half of the world's population is at risk of malaria and simultaneously, many malaria-endemic regions are facing dramatic increases in the prevalence of type 2 diabetes. Studies in murine malaria models have examined the impact of malaria infection on type 2 diabetes pathology, it remains unclear how this chronic metabolic disorder impacts the transmission of malaria. In this report, the ability type 2 diabetic rodents infected with malaria to transmit parasites to Anopheles stephensi mosquitoes is quantified. Methods: The infection prevalence and intensity of An. stephensi mosquitoes that fed upon control or type 2 diabetic C57BL/6 db/db mice infected with either lethal Plasmodium berghei NK65 or non-lethal Plasmodium yoelii 17XNL murine malaria strains were determined. Daily parasitaemias were also recorded. Results: A higher percentage of mosquitoes (87.5 vs 61.5 % for P. yoelii and 76.9 vs 50 % for P. berghei) became infected following blood feeding on Plasmodium-infected type 2 diabetic mice compared to mosquitoes that fed on infected control animals, despite no significant differences in circulating gametocyte levels. Conclusions: These results suggest that type 2 diabetic mice infected with malaria are more efficient at infecting mosquitoes, raising the question of whether a similar synergy exists in humans.

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Pakpour, N., Cheung, K. W., & Luckhart, S. (2016). Enhanced transmission of malaria parasites to mosquitoes in a murine model of type 2 diabetes. Malaria Journal, 15(1). https://doi.org/10.1186/s12936-016-1277-7

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