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Transgenic approach reveals expression of the VPAC<subscript>2</subscript> receptor in phenotypically defined neurons in the mouse suprachiasmatic nucleus and in its efferent target sites.
In: European Journal of Neuroscience, Jg. 19 (2004-04-15), Heft 8, S. 2201-2211
Online
academicJournal
Zugriff:
Circadian rhythms in mammals depend on the properties of cells in the suprachiasmatic nucleus (SCN). The retino-recipient core of the mouse SCN is characterized by vasoactive intestinal peptide (VIP) neurons. Expression within the SCN of VPAC2, a VIP receptor, is required for circadian rhythmicity. Using transgenic mice with β-galactosidase as a marker for VPAC2, we have phenotyped VPAC2expressing cells within the SCN and investigated expression of the VPAC2 marker at sites previously shown to receive VIP-containing SCN efferents. In situ hybridization and immunohistochemistry demonstrated identical distributions for VPAC2 mRNA and βgalactosidase and coexpression of the two signals in the SCN. Double-label confocal immunofluorescence identified β-galactosidase in 32% of the VIP and 31% of the calretinin neurons in the SCN core. Of the arginine-vasopressin neurons that characterize the SCN shell, 45% expressed β-galactosidase. In contrast, this marker was not apparent in astrocytes within the SCN core or shell. Cell bodies containing β-galactosidase were detected at sites reportedly receiving VIP-containing SCN efferents, including the subparaventricular zone and lateral septum and the anteroventral periventricular, preoptic suprachiasmatic, medial preoptic and paraventricular hypothalamic nuclei. The detection of a marker for VPAC2 expression in the SCN in almost one-third of the VIP and calretinin core neurons and nearly half of the arginine-vasopressin shell neurons and also in cell bodies at sites receiving VlP-immunoreactive projections from the SCN indicates that VPAC2 may contribute to autoregulation and/or coupling within the SCN core and to the control of the SCN shell and sites distal to this nucleus. [ABSTRACT FROM AUTHOR]
Titel: |
Transgenic approach reveals expression of the VPAC<subscript>2</subscript> receptor in phenotypically defined neurons in the mouse suprachiasmatic nucleus and in its efferent target sites.
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Autor/in / Beteiligte Person: | Kalló, Imre ; Kalamatianos, Theodosis ; Wiltshire, Nzinga ; Shen, Sanbing ; Sheward, W. John ; Harmar, Anthony J. ; Coen, Clive W. |
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Zeitschrift: | European Journal of Neuroscience, Jg. 19 (2004-04-15), Heft 8, S. 2201-2211 |
Veröffentlichung: | 2004 |
Medientyp: | academicJournal |
ISSN: | 0953-816X (print) |
DOI: | 10.1111/j.0953-816X.2004.03335.x |
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