Estereologia e ultra-estrutura da mucosa da parte proximal do duodeno de camundongos submetidos ao alcoolismo experimental / Stereology and ultrastructure of the mucosa of mouse proximal duodenum submitted to experimental alcoholism

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

A1coholism consists in one of the greatest problems of pharmacodependence, generating one of the main concerns in world public health. Several gastrointestinal complications decurres from alcoholic beverage consumption. The recent scientific studies enphasys is concentrated in substances that can interfere on preservation, maintenance and function of the intestinal barrier throught several mechanisms that are not well known. lnquiries of this nature can provi de knowledge to understand the role of repeated expositions of ethanol in low concentration on the morpho-physiology of the intestinal mucosa establishing correlations with the already known acute toxicity. C57BL/6 mice constitute experimental models for works related to morphologic, physiological, biochemical, nutritritional and pharmacological effects of ethanol, such studies are important means to understand human a1coholism. The present work analyzed the morphology of the proximal part of the duodenal mucosa of the mice lineage C57BL/6 submitted to a chronic ethanol 4,2% treatment, and divided into two groups: control (GC) and alcoholic (GA). Daily, the GC received 30 ml of a liquid nutritionally adequated diet (Sustacal) with dextrose (Dextrosol) in the equivalent caloric of etanol 4.2% and the GA received liquid diet (Sustacal) increased by etanol 4.2% (v/v). Both groups had received water ad libitum. After 8 weeks of treatment, the animaIs had been submitted to euthanasia for duodenum sampling and proceeding in order to microscopical and estereological techniques. Histological analysis showed that the animals from the GA presented shorter and enlarged duodenal villi with great loss of epithelium specially in apex. Mucosa areas seemed to be smooth, without villous. Estereologically, there was reduction in the surface density of villi and numerical density of goblet cells. ln alcoholic animals, the ultra-structural characteristics seen evidenced cell death: apoptosis, autophagy, and necrosis. This data suggest that the consumption of quantities clinically acceptable of ethanol represent risk to the maintenance of the duodenal villous integrity, interfering in the survival of the intestinal barrier and, possibly, in its physiology. Therefore, facts indicate that ethanol harmful action is concorning to whom is a light drinker

ASSUNTO(S)

histology mice ultrastructure (biology) alcool alcohol duodeno histologia duodenum ultraestrutura (biologia) camundongo

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