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Different uptake of cobalamin (vitamin B 12 ) by astrocytes and oligodendrocytes isolated from rat spinal cord
Author(s) -
Buccellato Francesca R.,
Foi Laura,
Veber Daniela,
Pravettoni Giulio,
Scalabrino Giuseppe
Publication year - 2004
Publication title -
glia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.954
H-Index - 164
eISSN - 1098-1136
pISSN - 0894-1491
DOI - 10.1002/glia.10345
Subject(s) - spinal cord , biology , astrocyte , neuroglia , incubation , cobalamin , in vitro , oligodendrocyte , medicine , endocrinology , microbiology and biotechnology , immunology , central nervous system , biochemistry , vitamin b12 , neuroscience , myelin
In the present study, we hypothesized that cobalamin (Cbl) deficiency might affect astrocytes and oligodendrocytes of rat spinal cord (SC) differently. Radiolabeled Cbl ([ Cyano ‐ 14 C]cyano‐Cbl) was used to investigate whether the in vitro uptake of Cbl is different in primary cultures of oligodendrocytes and astrocytes. In culture medium supplemented with serum that naturally contains Cbl, the time course of labeled Cbl uptake by neonatal oligodendrocytes had two peaks, at 8 h and 24 h. No uptake was observed when the same cells were cultured in a serum‐free medium and consequently in the absence of Cbl. Oligodendrocytes isolated from adult rat SC showed no uptake under any of the tested conditions. Astrocytes isolated from adult Cbl‐deficient and newborn rat SC, both cultured in a medium supplemented with serum, showed peak Cbl uptake at 8 h and 12 h, respectively, whereas those isolated from the SC of an adult normal rat cultured under the same conditions showed no uptake throughout the experimental period. Astrocytes isolated from normal, Cbl‐deficient adult rats and newborns cultured in a serum‐free medium not containing Cbl, showed a similar trend of Cbl uptake with a peak at 24 h. Oligodendrocytes isolated from Cbl‐deficient rats showed no uptake when cultured in medium with or without serum. This study provides evidence for a difference in the uptake of labeled Cbl between rat SC astrocytes and oligodendrocytes in relation to (1) age of the donor SC, (2) Cbl status of the donor SC, and (3) Cbl deficiency in the incubation medium that facilitates Cbl uptake in neonatal and adult astrocytes. © 2003 Wiley‐Liss, Inc.