Direct and indirect vitamin A supplementation strategies result in different plasma and tissue retinol kinetics in neonatal rats

作者：Tan Libo; Babbs Amanda E; Green Michael H; Ross A Catharine

来源：The Journal of Lipid Research, 2016, 57(8): 1423-1434.

DOI：10.1194/jlr.M067165

• neonate
• maternal dietary vitamin A
• compartmental model
• WinSAAM

Many questions remain regarding vitamin A (VA) supplementation of infants. Herein we compared direct oral VA supplementation of the neonate and indirect treatment through maternal dietary VA (M-VA) treatment on VA status and kinetics in neonatal rats. Treatments included direct VA combined with retinoic acid (RA) [D-VARA; VA (6 mg/kg) + 10% RA, given orally to neonates on postnatal day (P)2 and P3] and indirect VA supplementation through increased M-VA, compared with each other and oil-treated neonates. [H-3]retinol was administered orally to all neonates on P4. Plasma and tissue [H-3]retinol kinetics were determined from 1 h to 14 days post-dosing. D-VARA versus placebo dramatically increased liver and lung retinol, but only in the first 8-10 days. In M-VA neonates, liver and lung VA increased progressively throughout the study. Compartmental modeling of plasma [H-3]retinol showed that both D-VARA and indirect M-VA reduced retinol recycling between plasma and tissues. Compartmental models of individual tissues predicted that D-VARA stimulated the uptake of VA in chylomicrons to extrahepatic tissues, especially intestine, while the uptake was not observed in M-VA neonates.(jlr) In conclusion, indirect maternal supplementation had a greater sustained effect than D-VARA on neonatal VA status, while also differentially affecting plasma and tissue retinol kinetics.-Tan, L., A. E. Babbs, M. H. Green, and A. C. Ross. Direct and indirect vitamin A supplementation strategies result in different plasma and tissue retinol kinetics in neonatal rats.

• 出版日期2016-8