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Vol. 1, No. 1, 1978
Issue release date: 1978
Dev Neurosci 1978;1:15–30

Serotonin as a Differentiation Signal in Early Neurogenesis

Lauder J.M. · Krebs H.
Department of Biobehavioral Sciences, University of Connecticut, Storrs, Conn., and A. Ribicoff Research Center, Norwich Hospital, Norwich, Conn.


The hypothesis that serotonin (5-HT) influences the onset of differentiation (cessation of division) of prospective 5-HT target neurons during embryogenesis was tested by administering the 5-HT depleting drug p-chlorophenylalanine (pCPA) to pregnant rats and dating the time of last cell division for fetal neurons using long survival 3H-thymidine autoradiography. PCPA specifically retarded the onset of neuronal differentiation in brain regions known to contain 5-HT terminals or to have a high 5-HT content in the adult (5-HT target cells). Conversely, the 'stress' of daily vehicle injections accelerated onset of differentiation in these regions, possibly due to stimulation of 5-HT synthesis by glucocorticoids. These data support the model of 5-HT as a humoral signal for the differentiation of cells later recognized by 5-HT neurons as appropriate targets for synaptogenesis.

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Dr. Jean M. Lauder, A. Ribicoff Research Center, Norwich Hospital, Box 508, Norwich, CT 06360 (USA)

 goto top of outline Article Information

Published online: May 26, 2010
Number of Print Pages : 16

 goto top of outline Publication Details

Developmental Neuroscience

Vol. 1, No. 1, Year 1978 (Cover Date: 1978)

Journal Editor: Campagnoni, A.T. (Los Angeles, Calif.)
ISSN: 0378–5866 (Print), eISSN: 1421–9859 (Online)

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