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dc.contributor.author
Alzugaray, Maria Eugenia  
dc.contributor.author
Ronderos, Jorge Rafael  
dc.date.available
2019-03-18T22:45:46Z  
dc.date.issued
2018-03  
dc.identifier.citation
Alzugaray, Maria Eugenia; Ronderos, Jorge Rafael; Allatoregulatory-like systems and changes in cytosolic Ca2+ modulate feeding behavior in Hydra; Academic Press Inc Elsevier Science; General and Comparative Endocrinology; 258; 3-2018; 70-78  
dc.identifier.issn
0016-6480  
dc.identifier.uri
http://hdl.handle.net/11336/71978  
dc.description.abstract
Allatotropin (AT) and allatostatin-C (AST-C) are neuropeptides originally characterized by their ability to modulate the secretion of juvenile hormones in insects. Beyond the allatoregulatory function, these neuropeptides are pleiotropic acting as myoregulators not only in insects, but also in other groups of invertebrates. We have previously proposed the existence of AT and AST-C like systems in Hydra sp., a member of the phylum Cnidaria, which is a basal group of Metazoa, sharing a common ancestor with Bilateria. In the present study we analyze the regulatory effects of both peptides on the activity of the hypostome during feeding in Hydra sp. Furthermore, the importance of changes in the cytosolic Ca2+ levels involved in the response of the hypostome were analyzed. Physiological assays showed that while the presence of food or treatment with AT stimulates the extrusion of the hypostome, AST-C has an inhibitory effect on the behavior induced by both, food and AT. These facts suggest that both systems participate in the regulatory mechanisms associated with feeding and, as in insects, AST-C and AT may exert opposite effects. The use of thapsigargin (TG) and nifedipine, two compounds that modify the levels of cytosolic Ca2+, showed that changes in the levels of this ion are involved in the regulation of the activity of the hypostome. Indeed, these results suggest that the two basic mechanisms operating to increase the cytosolic levels of Ca2+ (i.e. the influx from the extracellular space and the release from endoplasmic reticulum) are relevant for the extrusion of the hypostome. Like in insects, the treatment with TG counteracted the effect of AST-C, suggesting that this peptide acts by reducing cytosolic Ca2+ levels. Furthermore, nifedipine prevented the myostimulatory effect of AT, showing that the effect of this peptide depends on the influx of Ca2+ throughout voltage-gated calcium channels. Altogether, these results suggest that the Allatotropin/Orexin and Allatostatin/Somatostatin regulatory systems could represent an ancestral mechanisms regulating hypostome activity and feeding behavior in Cnidaria.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Academic Press Inc Elsevier Science  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Allatostatin-C  
dc.subject
Allatotropin  
dc.subject
Calcium  
dc.subject
Hydra Sp  
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Myoregulatory  
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Neuropeptides  
dc.subject.classification
Medicina Critica y de Emergencia  
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Medicina Clínica  
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CIENCIAS MÉDICAS Y DE LA SALUD  
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Bioquímica y Biología Molecular  
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Ciencias Biológicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Allatoregulatory-like systems and changes in cytosolic Ca2+ modulate feeding behavior in Hydra  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2019-03-15T18:23:53Z  
dc.journal.volume
258  
dc.journal.pagination
70-78  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
Amsterdam  
dc.description.fil
Fil: Alzugaray, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina  
dc.description.fil
Fil: Ronderos, Jorge Rafael. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina  
dc.journal.title
General and Comparative Endocrinology  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.ygcen.2017.07.020  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0016648017303246