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Neurochemical Research

, Volume 20, Issue 5, pp 509–519 | Cite as

Development of the human hypothalamus

  • D. F. Swaab
Review

Abstract

The hypothalamus has been claimed to be involved in a great number of physiological functions in development, such as sexual differentiation (gender, sexual orientation) and birth, as well as in various developmental disorders including mental retardation, sudden infant death syndrome (SIDS), Kallman's syndrome and Prader-Willi syndrome. In this review a number of hypothalamic nuclei have therefore been discussed with respect to their development in health and disease.

The suprachiasmatic nucleus (SCN) is the clock of the brain and shows circadian, and seasonal fluctuations in vasopressin-expressing cell numbers. The SCN also seems to be involved in reproduction, adding interest to the sex differences in shape of the vasopressin-containing SCN subnucleus and in its VIP cell number. In addition, differences in relation to sexual orientation can be seen in this perspective. The vasopressin and VIP, neurons of the SCN develop mainly postnatally, but as premature children may have circadian temperature rhythms, a different SCN cell type is probably more mature at birth.

Thesexually dimorphic nucleus (SDN, intermediate nucleus, INAH-1), is twice as large in young male adults as in young females. At the moment of birth only 20% of the SDN cell number is present. From birth until two to four years of age cell numbers increase equally rapidly in both sexes. After this age cell numbers start to decrease in girls, creating the sex difference. The size of the SDN does not show any relationship to sexual orientation in men. The large neurosecretory cells of thesupraoptic (SON) andparaventricular nucleus (PVN) project to the neurohypophysis, where they release vasopressin and oxytocin into the blood circulation. In the fetus these hormones play an active role in the birth process. Fetal oxytocin may initiate or accelerate the course of labor. Fetal vasopressin plays a role in the adaptation to stress—caused by the birth process—by redistribution of the fetal blood flow.

Corticotropin-releasing hormone (CRH) neurons of the PVN play a central role in stress response. Thus fetal CRH neurons may play a role in the timing of the moment of birth. Recently, alterations have been described in peptidergic, aminergic and cholinergic transmitters in the hypothalamus in SIDS. Future research will have to establish whether these changes are part of the course of SIDS. A large proportion of the SON and PVN neurons also produce tyrosine hydroxylase (TH). In neonates the majority of TH-immunoreactive neurons colocalizes vasopressin, while in the adult the majority of TH-positive neurons colocalizes oxytocin. TH-expression might be a sign of hyperactivation, for example from perinatal hypoxia.

Oxytocin neurons also project to the brain stem. These neurons have an inhibitory effect on eating. Interestingly, in the Prader-Willi syndrome, characterized for example by insatiable hunger, we have found that the number of oxytocin-expressing neurons is about half the normal value. It can be concluded that the various hypothalamic nuclei are involved in a great number of functions and show clear and differential changes in development with respect to sexual differentiation, birth and a number of diseases. I believe that only a small proportion of such changes has at present been revealed.

Key words

Human hypothalamus suprachiasmatic nucleus sexually dimorphic nucleus supraoptic nucleus paraventricular nucleus vasopressin oxytocin development 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • D. F. Swaab
    • 1
  1. 1.Netherlands Institute for Brain ResearchGraduate School Neurosciences AmsterdamAmsterdam, ZOThe Netherlands

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