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1.
Dev Biol ; 412(1): 128-138, 2016 Apr 01.
Article in English | MEDLINE | ID: mdl-26921458

ABSTRACT

The nervous system plays a critical role in the regulation of animal body sizes. In Caenorhabditis elegans, an amine neurotransmitter, dopamine, is required for the tactile perception of food and food-dependent behavioral changes, while its role in development is unknown. In this study, we show that dopamine negatively regulates body size through a D2-like dopamine receptor, DOP-3, in C. elegans. Dopamine alters body size without affecting food intake or developmental rate. We also found that dopamine promotes egg-laying, although the regulation of body size by dopamine was not solely caused by this effect. Furthermore, dopamine negatively regulates body size through the suppression of signaling by octopamine and Gq-coupled octopamine receptors, SER-3 and SER-6. Our results demonstrate that dopamine and octopamine regulate the body size of C. elegans and suggest a potential role for perception in addition to ingestion of food for growth.


Subject(s)
Body Size , Caenorhabditis elegans/anatomy & histology , Dopamine/physiology , Animals , Caenorhabditis elegans/physiology , Transforming Growth Factor beta/metabolism
2.
J Neurosci Res ; 92(5): 671-8, 2014 May.
Article in English | MEDLINE | ID: mdl-24446241

ABSTRACT

It is common for neurotransmitters to possess multiple receptors that couple to the same intracellular signaling molecules. This study analyzes two highly homologous G-protein-coupled octopamine receptors using the model animal Caenorhabditis elegans. In C. elegans, the amine neurotransmitter octopamine induces activation of cAMP response element-binding protein (CREB) in the cholinergic SIA neurons in the absence of food through activation of the Gq-coupled octopamine receptor SER-3 in these neurons. We also analyzed another Gq-coupled octopamine receptor, SER-6, that is highly homologous to SER-3. As seen in ser-3 deletion mutants, octopamine- and food-deprivation-mediated CREB activation was decreased in ser-6 deletion mutants compared with wild-type animals, suggesting that both SER-3 and SER-6 are required for signal transduction. Cell-specific expression of SER-6 in the SIA neurons was sufficient to restore CREB activation in the ser-6 mutants, indicating that SER-6, like SER-3, functions in these neurons. Taken together, these results demonstrate that two similar G-protein-coupled receptors, SER-3 and SER-6, function in the same cells in a nonredundant manner.


Subject(s)
Food Deprivation/physiology , Neurons/metabolism , Receptors, Biogenic Amine/metabolism , Receptors, Serotonin, 5-HT3/metabolism , Receptors, Serotonin/metabolism , Transcriptome/physiology , Adrenergic alpha-Agonists/pharmacology , Animals , Animals, Genetically Modified , CREB-Binding Protein/metabolism , Caenorhabditis elegans , Caenorhabditis elegans Proteins/genetics , Mutation/genetics , Octopamine/pharmacology , Phylogeny , Receptors, Serotonin/genetics , Receptors, Serotonin, 5-HT3/genetics , Transcriptome/drug effects
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