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Dietary iron supplementation does not aggravate experimental malaria in young rats
M A Cardoso1, M U Ferreira, G S Ribeiro
1Department of Food and Experimental Nutrition, Faculty of Pharmaceutical Sciences, University of São Paulo, Brazil.
Abstract:
The hypotheses that iron-deficient hosts are less susceptible to severe malaria and that iron supplementation aggravates infection have been supported by some clinical and experimental evidence. In the present study, the course of Plasmodium berghei infection was monitored in an experimental model of dietary iron deficiency and iron supplementation. Weanling Wistar rats were fed purified diets with different iron concentrations: 20 mg/kg (Group D, n = 24), 50 mg/kg (Group N, n = 24) and 100 mg/kg (Group S, n = 12). After 15 d, rats from Group D were anemic (mean hemoglobin 81 g/l). The next day, 12 rats from Group D (thereafter Group DS) and 12 rats from Group N (thereafter Group NS) were transferred to the same iron-supplemented diet as in Group S, whereas the remaining animals (Groups D, N and S) were maintained on the original diets for further 14 d. At that time, 9 rats from each group were inoculated intraperitoneally with 10(6) erythrocytic parasites (P. berghei ANKA strain), whereas 3 rats from each group remained as noninfected controls. All animals were killed 14 d after inoculation, when significantly lower levels of hemoglobin, serum iron and percent transferrin saturation were found in infected animals from Group D compared with all other groups. However, the time course of parasitemias was similar in all groups. These data indicate that the development of P. berghei was neither suppressed by iron deficiency nor enhanced by iron supplementation in this model. Furthermore, iron repletion during infection did produce a noticeable improvement of hematological variables in previously iron-deficient animals.
Insights
Iron deficiency did not alter malaria development in rats, but iron repletion improved their blood health during infection. This study investigates iron"s role in malaria susceptibility.
Area of Science:
- Parasitology
- Nutritional Science
- Hematology
Background:
- Previous research suggests iron deficiency may reduce malaria severity, while iron supplementation could worsen it.
- This study examines the complex relationship between iron status and malaria infection using an experimental model.
Purpose of the Study:
- To investigate the effect of dietary iron deficiency and supplementation on the course of Plasmodium berghei infection in Wistar rats.
- To determine if iron status influences malaria parasite development and host hematological parameters.
Main Methods:
- Wistar rats were fed diets with varying iron concentrations (20, 50, 100 mg/kg) to induce iron deficiency or provide adequate/supplemented levels.
- Following an iron repletion phase for some groups, rats were inoculated with Plasmodium berghei ANKA strain.
- Parasitemia, hemoglobin, serum iron, and transferrin saturation were monitored throughout the 14-day infection period.
Main Results:
- Iron-deficient infected rats exhibited lower hemoglobin, serum iron, and transferrin saturation compared to other groups.
- Despite hematological differences, the time course of parasitemia was similar across all infected groups.
- Iron repletion during infection improved hematological variables in previously iron-deficient rats.
Conclusions:
- Dietary iron deficiency or supplementation did not significantly alter Plasmodium berghei development in this rat model.
- Iron status impacts host hematology during malaria but does not appear to modulate parasite growth rate.
- Iron repletion can ameliorate anemia in iron-deficient animals even during active malaria infection.