Dilatation of Golgi vesicles by monensin leads to enhanced accumulation of sugar nucleotides

Abstract : Incubation of mouse thymocytes with 10 μM monensin for 1 hour induces morphological alterations characterized by the extensive dilatation and vacuolization of the Golgi complex. This effect is used to study the transport and utilization of labelled sugar nucleotides into intracellular vesicles by using thymocytes whose plasma membrane has been permeabilized by ammonium chloride treatment. It is demonstrated that monensin stimulates the incorporation of labelled sialyl, fucosyl, galactosyl, and N-acetylglucosaminyl residues. This enhanced incorporation is not due to a direct effect of monensin on glycosyltransferase activities themselves but is a consequence of a higher entry and accumulation of labelled sugar nucleotides in the dilated vesicles.
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Submitted on : Thursday, October 21, 2010 - 10:01:00 AM
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Roméo Cecchelli, René Cacan, Eliane Porchet-Hennere, André Verbert. Dilatation of Golgi vesicles by monensin leads to enhanced accumulation of sugar nucleotides. Bioscience Reports, Portland Press, 1986, 6 (2), p. 227-234. ⟨hal-00528146⟩

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