IMIBIO-SL   20937
INSTITUTO MULTIDISCIPLINARIO DE INVESTIGACIONES BIOLOGICAS DE SAN LUIS
Unidad Ejecutora - UE
artículos
Título:
Effect of fasting in house sparrows digestive system: Histological study of small intestine
Autor/es:
FUNES, S. C.; FILIPPA, V.; CID, F. D.; MOHAMED, F.; CAVIEDES-VIDAL E.; CHEDIACK, J. G.
Revista:
TISSUE & CELL
Editorial:
CHURCHILL LIVINGSTONE
Referencias:
Lugar: ESCOCIA; Año: 2014 vol. 46 p. 356 - 362
ISSN:
0040-8166
Resumen:
The metabolic response of birds and mammals to fasting has been studied and characterized by three phases reflecting metabolic and physiological adjustments. An effective way to minimize energy expenditure during food scarcity is organ mass decrease. The digestive system is metabolically expensive to maintain, so small intestine and liver are the most affected organs. We evaluated the phase III starvation effects on organ mass and histological parameters on house sparrows, a small no migrant bird. In short time (34 hs) we observed a disproportionately large reduction of digestive organ mass compared with the decline in body mass and nonalimentary tissues. However, intestinal mass was more reduced than intestinal length and nominal surface area. Regarding histological parameters, a reduction on intestinal mucosal layer also resulted in a shortening of villus (length and thickness) and crypt depth. Moreover, enterocytes morphology also changed from cylindrical to cube suggesting that the surface exposed to lumen was conserved. This observation and the fact that nominal surface area/body mass remains constant in both treatments could be indicating an adaptive response to the moment of refeeding. In spite of the reduction of several histological parameters suggesting that starving produces the atrophy of small intestine, globet cells were conserved after fasting indicating a protective tendency.