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Octopamine and Dopamine differentially modulate the nicotine-induced calcium response in Drosophila Mushroom Body Kenyon Cells.
Leyton, V; Goles, N I; Fuenzalida-Uribe, N; Campusano, J M.
Afiliação
  • Leyton V; Laboratorio Neurogenética de la Conducta, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.
  • Goles NI; Laboratorio Neurogenética de la Conducta, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.
  • Fuenzalida-Uribe N; Laboratorio Neurogenética de la Conducta, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.
  • Campusano JM; Laboratorio Neurogenética de la Conducta, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile. Electronic address: jcampusano@bio.puc.cl.
Neurosci Lett ; 560: 16-20, 2014 Feb 07.
Article em En | MEDLINE | ID: mdl-24334164
In Drosophila associative olfactory learning, an odor, the conditioned stimulus (CS), is paired to an unconditioned stimulus (US). The CS and US information arrive at the Mushroom Bodies (MB), a Drosophila brain region that processes the information to generate new memories. It has been shown that olfactory information is conveyed through cholinergic inputs that activate nicotinic acetylcholine receptors (nAChRs) in the MB, while the US is coded by biogenic amine (BA) systems that innervate the MB. In this regard, the MB acts as a coincidence detector. A better understanding of the properties of the responses gated by nicotinic and BA receptors is required to get insights on the cellular and molecular mechanisms responsible for memory formation. In recent years, information has become available on the properties of the responses induced by nAChR activation in Kenyon Cells (KCs), the main neuronal MB population. However, very little information exists on the responses induced by aminergic systems in fly MB. Here we have evaluated some of the properties of the calcium responses gated by Dopamine (DA) and Octopamine (Oct) in identified KCs in culture. We report that exposure to BAs induces a fast but rather modest increase in intracellular calcium levels in cultured KCs. The responses to Oct and DA are fully blocked by a VGCC blocker, while they are differentially modulated by cAMP. Moreover, co-application of BAs and nicotine has different effects on intracellular calcium levels: while DA and nicotine effects are additive, Oct and nicotine induce a synergistic increase in calcium levels. These results suggest that a differential modulation of nicotine-induced calcium increase by DA and Oct could contribute to the events leading to learning and memory in flies.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Dopamina / Cálcio / Octopamina / Corpos Pedunculados / Drosophila melanogaster / Nicotina Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: Neurosci Lett Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Chile País de publicação: Irlanda

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Dopamina / Cálcio / Octopamina / Corpos Pedunculados / Drosophila melanogaster / Nicotina Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: Neurosci Lett Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Chile País de publicação: Irlanda