Hamasaka, Yasutaka and Rieger, Dirk and Parmentier, Marie-Laure and Grau, Yves and Helfrich-Foerster, Charlotte and Naessel, Dick R. (2007) Glutamate and its metabotropic receptor in Drosophila clock neuron circuits. JOURNAL OF COMPARATIVE NEUROLOGY, 505 (1). pp. 32-45. ISSN 0021-9967,
Full text not available from this repository. (Request a copy)Abstract
Identification of the neurotransmitters in clock neurons is critical for understanding the circuitry of the neuronal network that controls the daily behavioral rhythms in Drosophila. Except for the neuropeptide pigment-dispersing factor, no neurotransmitters have been clearly identified in the Drosophila clock neurons. Here we show that glutamate and its metabotropic receptor, DmGluRA, are components of the clock circuitry and modulate the rhythmic behavior pattern of Drosophila. The dorsal clock neurons, DN1s in the larval brain and some DN1s and DN3s in the adult brain, were immunolabeled with antibodies against Drosophila vesicular glutamate transporter (DvGluT), suggesting that they are glutamatergic. Because the DN1s may communicate with the primary pacemaker neurons, s-LN(v)s, we tested glutamate responses of dissociated larval s-LN(v)s by means of calcium imaging. Application of glutamate dose dependently decreased intracellular calcium in the s-LN(v)s. Pharmacology of the response suggests the presence of DmGluRA on the s-LN(v)s. Antibodies against DmGluRA labeled dissociated s-LN(v)s and the LNv dendrites in the intact larval and adult brain. The role of metabotropic glutamate signaling was tested in behavior assays in transgenic larvae and flies with altered DmGluRA expression in the LN(v)s and other clock neurons. Larval photophobic behavior was enhanced in DmGluRA mutants. For adults, we could induce altered activity patterns in the dark phase under LD conditions and increase the period during constant darkness by knockdown of DmGluRA expression in LN(v)s. Our results suggest that a glutamate signal from some of the DNs modulates the rhythmic behavior pattern via DmGluRA on the LN(v)s in Drosophila.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CIRCADIAN PACEMAKER NEURONS; PIGMENT-DISPERSING FACTOR; CENTRAL-NERVOUS-SYSTEM/; ACETYLCHOLINE-RECEPTORS; SUPRACHIASMATIC NUCLEUS; NEUROMUSCULAR-JUNCTION; SYNAPTIC-TRANSMISSION; LATERAL NEURONS; MELANOGASTER; RHYTHMS; circadian clock; glutamate receptor; vesicular glutamate transporter; neuromodulation; inhibition; locomotor activity |
| Subjects: | 500 Science > 590 Zoological sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Zoologie > Alumni or Retired > Organisation der inneren Uhr auf neuronaler Ebene (Prof. Dr. Charlotte Förster) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 30 Nov 2020 11:10 |
| Last Modified: | 30 Nov 2020 11:10 |
| URI: | https://pred.uni-regensburg.de/id/eprint/31985 |
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