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BackgroundAcute phase proteins (APPs) are associated with malaria-induced hyporetinemia (serum retinol <0.70 micromol/L); however, the degree of the association is not well documented.ObjectiveThe association between malaria-induced hyporetinemia and APPs was assessed.DesignIn a cross-sectional study, 90 children with serum retinol concentrations from <0.35 to >1.05 micromol/L were selected from children in a clinical trial of vitamin A supplementation. Serum was collected before treatment allocation. Retinol binding protein (RBP) concentrations were determined by radioimmunoassays, and transthyretin, alpha(1)-acid glycoprotein (AGP), alpha(1)-antichymotrypsin, C-reactive protein (CRP), haptoglobin, and albumin concentrations by radial immunodiffusion assays.ResultsChildren in the subsample had high rates of splenomegaly and Plasmodium-positive blood-smear slides (P < 0.01); AGP (Pearson's r = -0.40, P < 0.001) and CRP (r = -0.21, P = 0.04) were inversely correlated with retinol. The negative APPs RBP, transthyretin, and albumin were positively and significantly associated with retinol. All APPs, except alpha(1)-antichymotrypsin, were significantly correlated with splenomegaly. Of the positive APPs, AGP correlated with CRP (r = 0.37, P < 0.001), indicating chronic inflammation. In a stepwise regression analysis, 73% of retinol's variability was explained by RBP and transthyretin. The model predicted that a 1-SD increase in RBP or transthyretin increases retinol by approximately 0.38 or 0.47 micromol/L, respectively, whereas an equivalent increase in AGP decreases retinol by 0.12 micromol/L.ConclusionsThe RBP-transthyretin transport complex of retinol is not altered by inflammation. Positive APPs are useful markers of type and severity of inflammation; however, except for AGP, it is unlikely that they can correct for malaria-induced hyporetinemia.

Original publication

DOI

10.1093/ajcn/71.6.1582

Type

Journal

The American journal of clinical nutrition

Publication Date

06/2000

Volume

71

Pages

1582 - 1588

Addresses

Nutrition and Veterinary Science Departments, The Pennsylvania State University, University Park, PA 16802, USA. fxr5@psu.edu

Keywords

Animals, Humans, Plasmodium falciparum, Malaria, Falciparum, Vitamin A Deficiency, Splenomegaly, Vitamin A, Prealbumin, Acute-Phase Proteins, Retinol-Binding Proteins, Morbidity, Cross-Sectional Studies, Child, Preschool, Papua New Guinea, Female, Male