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Development, Vol 102, Issue 4 709-720, Copyright © 1988 by Company of Biologists

JOURNAL ARTICLES

Serotonin and morphogenesis. I. Sites of serotonin uptake and -binding protein immunoreactivity in the midgestation mouse embryo

JM Lauder, H Tamir and TW Sadler
Department of Cell Biology and Anatomy, University of North Carolina School of Medicine, Chapel Hill 27599.

The possible involvement of the neurotransmitter serotonin (5-HT) in morphogenesis of the craniofacial region in the mouse embryo has been investigated using the method of whole-embryo culture. Day-12 embryos were incubated for 3-4 h in the presence of 5-HT or its precursors L-tryptophan (L-TRP) or 5-hydroxytryptophan (5-HTP), followed by fixation, sectioning and staining with a specific antiserum to 5-HT. Sites of 5-HT immunoreactivity were found in a variety of locations in tissues of the head and neck, which are either epithelia derived from the non-neural ectoderm or are non-neuronal midline brain structures. These sites include the surface epithelia of the head, face, nasal prominences, branchial arches, oral cavity and associated parts of the nasal epithelium, the epithelium covering the eye, parts of the otic vesicle, the epiphysis and roof of the diencephalon. With the exception of the oral cavity, sites of immunoreactivity for serotonin-binding protein were identified in the mesenchyme adjacent to these sites. This mesenchyme consists of ectodermally derived neural crest cells, which are known to receive inductive influences from the epithelia with which they interact during their migration through the craniofacial region. The presence of 5-HT uptake sites in epithelia and adjacent sites of SBP in the underlying mesenchyme raises the possibility that 5-HT might be involved in those epithelial-mesenchymal interactions known to be important for the development of structures in the craniofacial region.


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© The Company of Biologists Ltd 1988