Short-term effects of vitamin A and antimalarial treatment on erythropoiesis in severely anemic Zanzibari preschool children

Sarah E. Cusick, James M. Tielsch, Mahdi Ramsan, Jape K. Jape, Sunil Sazawal, Robert E. Black, Rebecca J. Stoltzfus

Research output: Contribution to journalArticle

Abstract

Background: The pathophysiology of anemia in coastal East Africa is complex. Impaired erythropoietin production is one possible mechanism. Plasmodium falciparum malaria has been found to blunt erythropoietin production, whereas vitamin A stimulates erythropoietin production in vitro. Objective: We investigated the 72-h effects of vitamin A and the antimalarial drug sulfadoxine pyramethamine (SP) on erythropoietin production in severely anemic (hemoglobin ≤ 70 g/L) preschool children in Zanzibar, a region of known vitamin A deficiency. We hypothesized that both treatments would stimulate erythropoietin production directly, within 72 h, before a change in hemoglobin would occur. Design: One hundred forty-one severely anemic children were identified during the baseline assessment of a morbidity substudy of a community-based micronutrient supplementation trial. All severely anemic children were randomly assigned to receive either vitamin A (100 000 or 200 000 IU depending on age) or SP at baseline; 72 h later they received the opposite treatment plus daily hematinic syrup for 90 d. Erythropoietic and parasitic indicators were assessed at baseline and again after 72 h. Results: After 72 h, SP reduced the malaria parasite density (by 5029 parasites/μL; P < 0.001), CRP concentrations (by 10.6 mg/L; P = 0.001), and the proportion of children infected with malaria (by 32.4%; P < 0.001). Vitamin A reduced CRP (by 9.6 mg/L; P = 0.011), serum ferritin (by 18.1 μg/L; P = 0.042), and erythropoietin (by 194.7 mIU/mL; P = 0.011) concentrations and increased the reticulocyte production index (by 0.40; P = 0.041). Conclusions: Contrary to our hypothesis, vitamin A significantly decreased erythropoietin concentration. The most important effect of both vitamin A and SP was the rapid reduction of inflammation. Vitamin A also mobilized iron from stores and stimulated the production of new erythrocytes.

Original languageEnglish (US)
Pages (from-to)406-412
Number of pages7
JournalAmerican Journal of Clinical Nutrition
Volume82
Issue number2
DOIs
StatePublished - Jan 1 2005

Keywords

  • Anemia
  • Children
  • Erythropoiesis
  • Erythropoietin
  • Inflammation
  • Malaria
  • Vitamin A

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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