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Physiological Reviews, Vol. 81, No. 3, July 2001, pp. 1197-1267
Copyright ©2001 by the American Physiological Society
Rudolf Magnus Institute for Neurosciences, Section of Molecular Neuroscience, Department of Medical Pharmacology, University Medical Center Utrecht, Utrecht, The Netherlands; School of Biological Sciences, University of Manchester, Manchester, and Molecular Neuroendocrinology Research Group, Department of Medicine, University of Bristol, Bristol, United Kingdom; and Laboratory of Neurochemistry, National Institutes of Health, National Institute of Neurological Disorders and Stroke, Bethesda, Maryland
Burbach, J. Peter H.,
Simon M. Luckman,
David Murphy, and
Harold Gainer.
Gene Regulation in the
Magnocellular Hypothalamo-Neurohypophysial System. Physiol. Rev. 81: 1197-1267, 2001.
The hypothalamo-neurohypophysial system (HNS) is
the major peptidergic neurosecretory system through which the brain
controls peripheral physiology. The hormones vasopressin and oxytocin
released from the HNS at the neurohypophysis serve homeostatic
functions of water balance and reproduction. From a physiological
viewpoint, the core question on the HNS has always been, "How is the
rate of hormone production controlled?" Despite a clear description of the physiology, anatomy, cell biology, and biochemistry of the HNS
gained over the last 100 years, this question has remained largely
unanswered. However, recently, significant progress has been made
through studies of gene identity and gene expression in the
magnocellular neurons (MCNs) that constitute the HNS. These are keys to
mechanisms and events that exist in the HNS. This review is an
inventory of what we know about genes expressed in the HNS, about the
regulation of their expression in response to physiological stimuli,
and about their function. Genes relevant to the central question
include receptors and signal transduction components that receive and
process the message that the organism is in demand of a
neurohypophysial hormone. The key players in gene regulatory events,
the transcription factors, deserve special attention. They do not only
control rates of hormone production at the level of the gene, but also
determine the molecular make-up of the cell essential for
appropriate development and physiological functioning. Finally, the HNS
neurons are equipped with a machinery to produce and secrete hormones
in a regulated manner. With the availability of several gene transfer
approaches applicable to the HNS, it is anticipated that new insights
will be obtained on how the HNS is able to respond to the physiological
demands for its hormones.
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