Molecular evidence for the localization of Plasmodium falciparum immature gametocytes in bone marrow

Aguilar, R. et al. (2014) Molecular evidence for the localization of Plasmodium falciparum immature gametocytes in bone marrow. Blood, 123(7), pp. 959-966. (doi: 10.1182/blood-2013-08-520767) (PMID:24335496) (PMCID:PMC4067503)

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Plasmodium falciparum immature gametocytes are not observed in peripheral blood. However, gametocyte stages in organs such as bone marrow have never been assessed by molecular techniques, which are more sensitive than optical microscopy. We quantified P falciparum sexual stages in bone marrow (n = 174) and peripheral blood (n = 70) of Mozambican anemic children by quantitative polymerase chain reaction targeting transcripts specific for early (PF14_0748; PHISTa), intermediate (PF13_0247; Pfs48/45), and mature (PF10_0303; Pfs25) gametocytes. Among children positive for the P falciparum housekeeping gene (PF08_0085; ubiquitin-conjugating enzyme gene) in bone marrow (n = 136) and peripheral blood (n = 25), prevalence of immature gametocytes was higher in bone marrow than peripheral blood (early: 95% vs 20%, P < .001; intermediate: 80% vs 16%; P < .001), as were transcript levels (P < .001 for both stages). In contrast, mature gametocytes were more prevalent (100% vs 51%, P < .001) and abundant (P < .001) in peripheral blood than in the bone marrow. Severe anemia (3.57, 95% confidence interval 1.49-8.53) and dyserythropoiesis (6.21, 95% confidence interval 2.24-17.25) were independently associated with a higher prevalence of mature gametocytes in bone marrow. Our results highlight the high prevalence and abundance of early sexual stages in bone marrow, as well as the relationship between hematological disturbances and gametocyte development in this tissue.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Marti, Professor Matthias
Authors: Aguilar, R., Magallon-Tejada, A., Achtman, A. H., Moraleda, C., Joice, R., Cistero, P., Li Wai Suen, C. S. N., Nhabomba, A., Macete, E., Mueller, I., Marti, M., Alonso, P. L., Menendez, C., Schofield, L., and Mayor, A.
College/School:College of Medical Veterinary and Life Sciences > School of Infection & Immunity
Journal Name:Blood
Publisher:American Society of Hematology
ISSN (Online):1528-0020
Published Online:13 February 2014

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