UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Primary neuronal differentiation in Xenopus embryos is linked to the β subunit of the sodium pump

Messenger, NJ; Warner, AE; (2000) Primary neuronal differentiation in Xenopus embryos is linked to the β subunit of the sodium pump. Developmental Biology , 220 (2) 168 - 182. 10.1006/dbio.2000.9646.

Full text not available from this repository.

Abstract

In amphibian embryos, activation of additional sodium pumps in neural plate cell membranes ensures that neural plate-derived neurons differentiate subsequently in the neural tube. When the sodium pump is inhibited during the mid-neural fold stages, neuronal differentiation fails. The effect is irreversible. We find that these events operate through the Na pump β subunit. When neural plate-specific Na pumps are activated, transcripts for β decline precipitately during the mid-neural fold stages, first in the neural plate and then in the dorsal mesoderm. As the neural tube closes, β returns, specifically in motor neurons and interneurons. Inhibition of the Na pump with the cardiac glycoside strophanthidin prevents the normal fall in β during neurulation: β is maintained in the neural plate until the neural tube closes, but lost from the dorsal mesoderm. Complete elimination of β transcripts from dorsal structures then occurs. Inhibiting the Na pump does not induce cell death (assessed by TUNEL staining) in the nervous system. Transcripts for X-Delta, NeuroD, and GSK3β are not affected by inhibition of the Na pump. Xotch and N-tubulin transcripts fall to very low levels and Xotch disappears permanently from the nervous system. When β transcript expression is maintained throughout neurulation, by over expression of injected mRNAs, Xotch is eliminated from the neural tube and somites and switches to the ectoderm. (C) 2000 Academic Press.

Type:Article
Title:Primary neuronal differentiation in Xenopus embryos is linked to the β subunit of the sodium pump
DOI:10.1006/dbio.2000.9646
UCL classification:UCL > School of Life and Medical Sciences > Faculty of Life Sciences

Archive Staff Only: edit this record