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The Journal of Neuroscience, January 1, 2003, 23(1):230-239
Normal Female Sexual Development Requires Neuregulin-erbB Receptor Signaling in Hypothalamic Astrocytes
Vincent Prevot2, *, Carlos Rio1, *, Gyeong J. Cho2, Alejandro Lomniczi2, Sabine Heger2, Craig M. Neville3, Nadia A. Rosenthal3, Sergio R. Ojeda2, and Gabriel Corfas1 1 Division of Neuroscience, Children's Hospital, Harvard Medical School, Boston, Massachusetts 02115, 2 Division of Neuroscience, Oregon Regional Primate Research Center/Oregon Health Sciences University, Beaverton, Oregon 97006, and 3 Cardiovascular Research Center, Massachusetts General Hospital, Charlestown, Massachusetts 02129
The initiation of mammalian puberty requires the activation of hypothalamic neurons secreting the neuropeptide luteinizing hormone-releasing hormone (LHRH). It is thought that this activation is caused by changes in trans-synaptic input to LHRH neurons. More recently, it has been postulated that the pubertal increase in LHRH secretion in female animals also requires neuron-glia signaling mediated by growth factors of the epidermal growth factor (EGF) family and their astrocytic erbB receptors. Although it appears clear that functional astrocytic erbB1 receptors are necessary for the timely advent of puberty, the physiological contribution that erbB4 receptors may make to this process has not been established. To address this issue, we generated transgenic mice expressing a dominant-negative erbB4 receptor (DN-erbB4) under the control of the GFAP promoter, which targets transgene expression to astrocytes. DN-erbB4 expression is most abundant in hypothalamic astrocytes, where it blocks the ligand-dependent activation of glial erbB4 and erbB2 receptors, without affecting erbB1 (EGF) receptor signaling. Mice carrying the transgene exhibit delayed sexual maturation and a diminished reproductive capacity in early adulthood. These abnormalities are related to a deficiency in pituitary gonadotropin hormone secretion, caused by impaired release of LHRH, the hypothalamic neuropeptide that controls sexual development. In turn, the reduction in LHRH release is caused by the inability of hypothalamic astrocytes to respond to neuregulin (NRG) with production of prostaglandin E2, which in wild-type animals mediates the stimulatory effect of astroglial erbB receptor activation on neuronal LHRH release. Thus, neuron-astroglia communication via NRG-erbB4/2 receptor signaling appears to be essential for the timely unfolding of the developmental program by which the brain controls mammalian sexual maturation.
Key words: neuregulin; neuroendocrine; mammalian puberty; hypothalamus; astrocytes; neuron-glia interactions
* V.P. and C.R. contributed equally to this work.
Copyright © 2003 Society for Neuroscience 0270-6474/03/231230-10$05.00/0
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