Para acceder a los documentos con el texto completo, por favor, siga el siguiente enlace:

Changes in the enterocyte cytoskeleton in newborn rats exposed to ethanol in utero
Montes Castillo, Juan Francisco; Estrada i Bertran, Gemma; López Tejero, M. Dolores; García Valero, Josep
Universitat de Barcelona
BACKGROUND: Cytoskeletal changes after longterm exposure to ethanol have been described in a number of cell types in adult rat and humans. These changes can play a key part in the impairment of nutrient assimilation and postnatal growth retardation after prenatal damage of the intestinal epithelium produced by ethanol intake. AIMS: To determine, in the newborn rat, which cytoskeletal proteins are affected by longterm ethanol exposure in utero and to what extent. ANIMALS: The offspring of two experimental groups of female Wistar rats: ethanol treated group receiving up to 25% (w/v) of ethanol in the drinking fluid and control group receiving water as drinking fluid. METHODS: Single and double electron microscopy immunolocalisation and label density estimation of cytoskeletal proteins on sections of proximal small intestine incubated with monoclonal antibodies against actin, alpha-tubulin, cytokeratin (polypeptides 1, 5, 6, 7, 8, 10, 11, and 18), and with a polyclonal antibody anti-beta 1,4-galactosyl transferase as trans golgi (TG) or trans golgi network (TGN) marker, or both. SDS-PAGE technique was also performed on cytoskeletal enriched fractions from small intestine. Western blotting analysis was carried out by incubation with the same antibodies used for immunolocalisation. RESULTS: Intestinal epithelium of newborn rats from the ethanol treated group showed an overexpression of cytoskeletal polypeptides ranging from 39 to 54 kDa, affecting actin and some cytokeratins, but not tubulin. Furthermore, a cytokeratin related polypeptide of 28-29 kDa was identified together with an increase in free ubiquitin in the same group. It was noteworthy that actin and cytokeratin were abnormally located in the TG or the TGN, or both. CONCLUSIONS: Longterm exposure to ethanol in utero causes severe dysfunction in the cytoskeleton of the developing intestinal epithelium. Actin and cytokeratins, which are involved in cytoskeleton anchoring to plasma membrane and cell adhesion, are particularly affected, showing overexpression, impaired proteolysis, and mislocalisation.
Efectes fisiològics
Physiological aspects
(c) BMJ Publishing Group Ltd and British Society of Gastroenterology, 1996
BMJ Group

Mostrar el registro completo del ítem

Documentos relacionados

Otros documentos del mismo autor/a

Montes Castillo, Juan Francisco; Estrada i Bertran, Gemma; López Tejero, M. Dolores; García Valero, Josep
Olloquequi González, Jordi; Garcia Valero, Josep; Rodríguez, E.; Montero, M. A.; Ferrer, J.; Montes Castillo, Juan Francisco
Ricart i Jané, David; Casanovas Torrequebrada, Albert; Jané, N.; González Junca, Alba; Buira Morell, Irma; Ribera, J.; Llobera i Sande, Miquel; López Tejero, M. Dolores
Ricart i Jané, David; Cejudo Martín, María del Pilar; Peinado Onsurbe, Julia; López Tejero, M. Dolores; Llobera i Sande, Miquel