Steven Mcintire

Publication Details

  • The G-protein-coupled serotonin receptor SER-1 regulates egg laying and male mating behaviors in Caenorhabditis elegans JOURNAL OF NEUROSCIENCE Carnell, L., Illi, J., Hong, S. W., McIntire, S. L. 2005; 25 (46): 10671-10681


    Serotonin (5-HT) is a neuromodulator that regulates many aspects of animal behavior, including mood, aggression, sex drive, and sleep. In vertebrates, most of the behavioral effects of 5-HT appear to be mediated by G-protein-coupled receptors (GPCRs). Here, we show that SER-1 is the 5-HT GPCR responsible for the stimulatory effects of exogenous 5-HT in two sexually dimorphic behaviors of Caenorhabditis elegans, egg laying and male ventral tail curling. Loss of ser-1 function leads to decreased egg laying in hermaphrodites and defects in the turning step of mating behavior in males. ser-1 is expressed in muscles that are postsynaptic to serotonergic neurons and are known to be required for these behaviors. Analysis of the ser-1 mutant also reveals an inhibitory effect of 5-HT on egg laying that is normally masked by SER-1-dependent stimulation. This inhibition of egg laying requires MOD-1, a 5-HT-gated chloride channel. Loss of mod-1 function in males also produces defects in ventral tail curling and enhances the turning defects in ser-1 mutant males. Sustained elevations in 5-HT levels result in behavioral adaptation to both the stimulatory and inhibitory actions of the neurotransmitter, indicating that both SER-1 and MOD-1 signaling can be modulated. Removal of wild-type animals from high levels of exogenous 5-HT produces a SER-1-dependent withdrawal response in which egg laying is significantly decreased. These studies provide insight into the role of 5-HT in behavior and the regulation of 5-HT(2) receptor function.

    View details for DOI 10.1523/JNEUROSCI.3399-05.2005

    View details for Web of Science ID 000233319100011

    View details for PubMedID 16291940

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