High-affinity sodium-vitamin C co-transporters (SVCT) expression in embryonic mouse neurons

Castro M.; Caprile T.; Astuya A.; Millán C; Reinicke K; Vera, JC; Vásquez O.; Aguayo, LG; Nualart, F.

Abstract

The sodium-vitamin C co-transporters SVCT1 and SVCT2 transport the reduced form of vitamin C, ascorbic acid. High expression of the SVCT2 has been demonstrated in adult neurons and choroid plexus cells by in situ hybridization. Additionally, embryonic mesencephalic dopaminergic neurons express the SVCT2 transporter. However, there have not been molecular and kinetic analyses addressing the expression of SVCTs in cortical embryonic neurons. In this work, we confirmed the expression of a SVCT2-like transporter in different regions of the fetal mouse brain and in primary cultures of neurons by RT-PCR. Kinetic analysis of the ascorbic acid uptake demonstrated the presence of two affinity constants, 103 ?M and 8 ?M. A Km of 103 ?M corresponds to a similar affinity constant reported for SVCT2, while the Km of 8 ?M might suggest the expression of a very high affinity transporter for ascorbic acid. Our uptake analyses also suggest that neurons take up dehydroascorbic acid, the oxidized form of vitamin C, through the glucose transporters. We consider that the early expression of SVCTs transporters in neurons is important in the uptake of vitamin C, an essential molecule for the fetal brain physiology. Vitamin C that is found at high concentration in fetal brain may function in preventing oxidative free radical damage, because antioxidant radical enzymes mature only late in the developing brain.

Más información

Título según WOS: High-affinity sodium-vitamin C co-transporters (SVCT) expression in embryonic mouse neurons
Título según SCOPUS: High-affinity sodium-vitamin C co-transporters (SVCT) expression in embryonic mouse neurons
Título de la Revista: JOURNAL OF NEUROCHEMISTRY
Volumen: 78
Número: 4
Editorial: Wiley
Fecha de publicación: 2001
Página de inicio: 815
Página final: 823
Idioma: English
URL: http://doi.wiley.com/10.1046/j.1471-4159.2001.00461.x
DOI:

10.1046/j.1471-4159.2001.00461.x

Notas: ISI, SCOPUS