Abstract
Multiple assays for Shh activity using cell lines, primary cultures, and explanted tissue have been described. We first described the use of E11.5 rat dorsal telencephalic explants to assay Shh ventralizing and differentiation-inducing activity in Kohtz et al. (1). Using this assay, we subsequently showed that N-lipid modification is critical for Shh activity in the telencephalon (2). In vivo assays for lipid-modified Shh support the results of our E11.5 telencephalic neural explant assay (2). More recently, the method of isolating telencephalic explants was improved by an intraocular grid, increasing both its accuracy and reproducibility (3). Shh induces the expression of the following ventral telencephalic markers: MASH-1, the Dlx’s, and Islet 1/2. Therefore, this assay for Shh induction of GABAergic interneurons defines a competent, but naïve region within the E11.5 dorsal telencephalon, allowing the study of GABAergic interneuron induction and differentiation from an unspecified progenitor population.
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Kohtz, J. D., Baker, D. P., Corte, G., and Fishell, G. (1998) Regionalization within the mammalian telencephalon is mediated by changes in responsiveness to Sonic Hedgehog. Development 125, 5079–5089.
Kohtz, J. D., Lee, H. Y., Gaiano, N., et al. (2001) N-terminal fatty-acylation of Sonic Hedgehog enhances the induction of rodent ventral forebrain neurons. Development 128, 2351–2363.
Feng, J., White, B., Tyurina, O. V., et al. (2004) Synergistic and antagonistic roles of the Sonic Hedgehog N-and C-terminal lipids. Development 131, 4357–4370.
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© 2007 Humana Press Inc., Totowa, NJ
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Mady, R., Kohtz, J.D. (2007). Isolation of Rat Telencephalic Neural Explants to Assay Shh GABAergic Interneuron Differentiation-Inducing Activity. In: Horabin, J.I. (eds) Hedgehog Signaling Protocols. Methods Inmolecular Biology™, vol 397. Humana Press. https://doi.org/10.1007/978-1-59745-516-9_4
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DOI: https://doi.org/10.1007/978-1-59745-516-9_4
Publisher Name: Humana Press
Print ISBN: 978-1-58829-692-4
Online ISBN: 978-1-59745-516-9
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