Abstract
A number of cellular developmental processes occur in an orchestrated fashion to mediate the transition from a simple neural tube to the complexity of the adult brain. A combination of internal programming and external cues provides the molecular specificity needed to direct cells to the correct location, initiate correct gene expression, and connect to the appropriate circuits. The heterogeneous cells of the hypothalamus affect all aspects of physiology through the regulation of the autonomic nervous system, motivated behavior, and endocrine balance. Small disruptions (genetic or environmental) to hypothalamic development can impact adult physiology and contribute to pathology. GABAergic signaling has drawn the attention of developmental neuroendocrinologists as a potential effector system of hypothalamic development. This chapter discusses the role of GABA in directing the development of the hypothalamus, specifically related to the migration of neurons that release gonadotropin-releasing hormone (GnRH), and in the formation of the ventromedial (VMH) and paraventricular (PVN) nuclei of the hypothalamus (Fig. 7.1).
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Abbreviations
- AOB:
-
Accessory olfactory bulb
- GABA:
-
Gamma aminobutyric acid
- GAD:
-
Glutamic acid decarboxylase
- GnRH:
-
Gonadotropin releasing hormone
- OB:
-
Olfactory bulb
- OE:
-
Olfactory epithelium
- PVN:
-
Paraventricular nucleus of the hypothalamus
- VMH:
-
Ventromedial nucleus of the hypothalamus
- VNO:
-
Vomeronasal organ
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Acknowledgments
We would like to thank Dr. Kristy McClellan for helpful discussion, Mr. Luke Schwerdtfeger for expert assistance in preparing figures, and Dr. Deborah Kurrasch for providing an original digital image for use in Fig. 7.4. MS was supported by 1K01AG056848.
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Key References
Key References
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Altman and Bayer (1986). This is a classic description of the birth of cells in the diencephalon.
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Frahm et al. (2012). First paper to indicate a role for regulated development of hypothalamic vasculature.
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Herbison et al. (2008). This paper is notable for being the first to directly address the redundancy in the GnRH population needed for fertility.
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Miller and Nowakowski (1988). This paper introduced the BrdU method to the neuroscience community and kicked off a plethora of studies of cell proliferation in the nervous system due to the relative ease compared to the use of tritiated thymidine.
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Okamura et al. (1990). This paper was the first to note the special relationship between cell bodies for GABA synthesis based on the localization of glutamic acid decarboxylases and how they lie outside of major hypothalamic cell groups.
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Puelles and Rubenstein (2015). This paper updates history and approaches to parcellation of the hypothalamus on the basis of large anatomical assumptions to smaller units informed by molecular data.
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Rakic (1972). This paper defined the classic view of radial glia providing migratory guidance for neuroblasts in cerebral cortex.
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Salic and Mitchison (2008). This paper provides an impetus to switch from BrdU to EdU as a marker for DNA synthesis and thereby (indirectly) proliferation.
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Stratton, M., Tobet, S. (2020). Hypothalamic Development: Role of GABA. In: Wray, S., Blackshaw, S. (eds) Developmental Neuroendocrinology. Masterclass in Neuroendocrinology, vol 9. Springer, Cham. https://doi.org/10.1007/978-3-030-40002-6_7
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