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Fetuin in the developing neocortex of the rat: distribution and origin


Dziegielewska, KM and Daikuhara, Y and Ohnishi, T and Waite, MPE and Ek, J and Habgood, MD and Lane, MA and Potter, A and Saunders, NR, Fetuin in the developing neocortex of the rat: distribution and origin, The Journal of Comparative Neurology, 423, (3) pp. 373-388. ISSN 0021-9967 (2000) [Refereed Article]

DOI: doi:10.1002/1096-9861(20000731)423:3<373::AID-CNE2>3.0.CO;2-D


Immunocytochemical distribution of the fetal protein fetuin in the neocortex of developing rat brain and the presence of its mRNA, as detected by using reverse transcriptase-polymerase chain reaction analysis, was studied in fetuses at embryonic day 15 (E15) through E22, in neonates at postnatal day 0 (P0) through P20, and in adults. Quantitative estimates of fetuin in cerebrospinal fluid (CSF) and plasma were obtained over the same period. Exogenous (bovine) fetuin injected intraperitoneally into fetal and postnatal rats was used to study the uptake of fetuin into CSF and brain and its distribution compared with endogenous fetuin; bovine albumin was used as a control. Fetuin was identified immunocytochemically in the cortical plate and subplate cells of the developing neocortex. In the rat fetus, fetuin first was apparent at E17, mainly in cell processes, but a few subplate cells also were positive. By E18, there was strong staining in subplate neurons and in inner cells of the cortical plate. At E21, these inner cells of the cortical plate were beginning to differentiate into layer VI neurons, many of which were positive for fetuin. By P0-P1, more layer VI neurons and some layer V neurons had become positive for fetuin. Fetuin immunoreactivity generally was weaker at P1, and, by P2-P3, it had disappeared from all of the layers of the developing neocortex. Bovine fetuin (but not albumin), probably taken up through CSF over the neocortical dorsal surface, had a cytoplasmic distribution; endogenous rat fetuin was both cytoplasmic and membrane bound. Thus, much of this fetuin can be accounted for by uptake, although the presence of fetuin mRNA indicates that in situ synthesis may also contribute. (C) 2000 Wiley-Liss, Inc.

Item Details

Item Type:Refereed Article
Research Division:Biomedical and Clinical Sciences
Research Group:Neurosciences
Research Field:Central nervous system
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Dziegielewska, KM (Dr Kate Dziegielewska)
UTAS Author:Ek, J (Mr Joachim Ek)
UTAS Author:Habgood, MD (Dr Mark Habgood)
UTAS Author:Lane, MA (Mr Michael Aron Lane)
UTAS Author:Potter, A (Mrs Ann Potter)
UTAS Author:Saunders, NR (Professor Norman Saunders)
ID Code:19729
Year Published:2000
Web of Science® Times Cited:36
Deposited By:Anatomy and Physiology
Deposited On:2000-08-01
Last Modified:2011-08-04

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