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Use of biomarkers of sub-clinical infection, nutrition and neonatal maturity to interpret plasma retinol in Nigerian neonates

Published online by Cambridge University Press:  09 March 2007

Delana A. Adelekan
Affiliation:
Department of Community Health, Obafemi Awolowo, University Ile-Ife, Nigeria
Christine A. Northrop-Clewes
Affiliation:
Northern Ireland Centre for Diet and Health (NICHE), University of Ulster, Coleraine BT52 1SA, Northern Ireland, UK
Joshua A. Owa
Affiliation:
Department of Paediatrics and Child Health, Obafemi Awolowo, University Ile-Ife, Nigeria
Adesola O. Oyedeji
Affiliation:
Department of Paediatrics, Wesley Guild Hospital, Ilesa, Nigeria
Adedayo A. Owoeye
Affiliation:
Department of Paediatrics, Wesley Guild Hospital, Ilesa, Nigeria
David I. Thurnham*
Affiliation:
Northern Ireland Centre for Diet and Health (NICHE), University of Ulster, Coleraine BT52 1SA, Northern Ireland, UK
*
*Corresponding author: Professor David I. Thurnham, fax +44 2870 324965, email [email protected]
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Abstract

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Using the World Health Organization criterion, the prevalence of sub-clinical vitamin A deficiency can be assessed using plasma retinol concentrations <0·7 μmol/l. However, plasma retinol can be depressed by infection; thus, the use of this criterion alone may overestimate deficiency. In the present study, we investigated the usefulness of the acute-phase proteins (APP) α1-antichymotrypsin (ACT) and α1-acid glycoprotein (AGP), plasma carotenoids and anthropometric and gestational indices to interpret plasma retinol in the blood of 192 apparently healthy Nigerian neonates collected randomly during days 1–20 postpartum. The mean weight (2·64 kg) and length (0·458 m) of the neonates and plasma concentrations (geometric mean, μmol/l) of retinol (0·54), α-carotene (0·072), ß-carotene (0·076) and lutein (0·080) were low. The prevalence of vitamin A deficiency was 72 %, indicating a severe public health problem. Babies who were of low birth weight (P<0·003) or premature and low birth weight (P<0·023) had significantly lower retinol concentrations than full-term normal weight babies. Thirty-two neonates had abnormal ACT and forty-four abnormal AGP concentrations. Positive correlations between retinol and ACT (r 0·186, P=0·05) and AGP (r 0·31, P=0·0001) during days 1–5 may be due to the increasing plasma retinol from maternal milk and a coincidental increasing capacity to synthesise APP. Subsequently, negative correlations between retinol and ACT (r −0·28, P=0·02) and AGP (r −0·29, P=0·018) from day 6 onwards reflected the continuing increase in plasma retinol, but no further increase in the APP. Overall, weight, ACT, lutein and age explained 30 % of the variance in retinol, but lutein was the most significant (r2 0·18, P<0·0001). Hence, the distribution of plasma retinol concentrations in this group of neonates was more strongly linked with nutrition (via the surrogate marker lutein) than infection.

Type
Research Article
Copyright
Copyright © The Nutrition Society 2003

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