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Dadun > Depósito Académico > CIMA (Centro de Investigación Médica Aplicada) > Área de Oncología > Biomarcadores > DA - CIMA - Oncología - Biomarcadores - Artículos de Revista >

Effects of food nutrient content, insect age and stage in the feeding cycle on the FMRFamide immunoreactivity of diffuse endocrine cells in the locust gut
Autor(es) : Zudaire, E. (Enrique)
Simpson, S.J. (Steve J.)
Montuenga, L.M. (Luis M.)
Palabras clave : Endocrine cell
FMRFamide
Protein
Carbohydrate
Locusta migratoria
Midgut
Feeding
Behaviour
Diet
Nutritional balance
Fecha incorporación: 1998
Editorial : Company of Biologists
Versión del editor: http://jeb.biologists.org/content/201/21/2971
ISSN: 1477-9145
Cita: Zudaire E, Simpson SJ, Montuenga LM. Effects of food nutrient content, insect age and stage in the feeding cycle on the FMRFamide immunoreactivity of diffuse endocrine cells in the locust gut. J Exp Biol 1998 Nov;201(Pt 21):2971-2979.
Resumen
We have studied the influence of variations in dietary protein and digestible carbohydrate content, of insect age and of time during the feeding cycle on the endocrine cells of the ampullar region of the midgut in the African migratory locust Locusta migratoria L. Morphometric analysis of FMRFamide-like immunoreactivity was used as an indirect measure of the amount of FMRFamide-related peptides (FaRPs) stored in the gut endocrine cells. There was a highly significant correlation between FaRP content and the nutritional quality of the food, measured relative to the concentrations and ratio of protein to digestible carbohydrate in a nutritionally optimal diet. The direction of the relationship between FaRP content and diet quality varied with age during the fifth stadium. On day 1, FaRP levels increased with the nutritional quality of the food, while on day 4 the opposite relationship was observed. Release of peptide was triggered by the onset of a meal during ad libitum feeding, with cell FaRP levels returning to premeal values within 15 min of the meal ending. The results also suggested that cell contents were released during food deprivation beyond the normal intermeal interval. Locusts switched for a single meal during ad libitum feeding on day 4 from a low- to a high-carbohydrate food did not respond by reducing endocrine cell FaRP content. Our results show a relationship between the diffuse gut endocrine system and feeding and nutrition in locusts. The ampullar endocrine cells are in three-way contact with the midgut luminal contents, with the primary urine from the Malpighian tubules and with the haemolymph. They are thus ideally positioned to play an integrative receptor-secretory function in the regulation of a variety of post-ingestive processes, such as enzyme secretion, absorption, gut motility or nutrient metabolism.
Enlace permanente: http://hdl.handle.net/10171/20165
Aparece en las colecciones: DA - Ciencias - HAP - Artículos de revista
DA - CIMA - Oncología - Biomarcadores - Artículos de Revista

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