Plant Physiology Preview
Published on August 6, 2004; 10.1104/pp.104.044891
Received April 22, 2004
Returned for revision May 31, 2004
Accepted June 4, 2004
Novel Regulation of Aquaporins during Osmotic Stress
Rosario Vera-Estrella *, Bronwyn J. Barkla , Hans J. Bohnert , and Omar Pantoja
Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de Mexico, Cuernavaca, Morelos, 62250, Mexico (R.V.-E., B.J.B., O.P.); and Departments of Plant Biology and Crop Sciences, University of Illinois, Urbana, Illinois 61801-3838 (H.J.B.)
* Corresponding author; email: rosario{at}ibt.unam.mx.
Aquaporin protein regulation and redistribution in response to osmotic stress was investigated. Ice plant (Mesembryanthemum crystallinum) McTIP1;2 (McMIPF) mediated water flux when expressed in Xenopus leavis oocytes. Mannitol-induced water imbalance resulted in increased protein amounts in tonoplast fractions and a shift in protein distribution to other membrane fractions, suggesting aquaporin relocalization. Indirect immunofluorescence labeling also supports a change in membrane distribution for McTIP1;2 and the appearance of a unique compartment where McTIP1;2 is expressed. Mannitol-induced redistribution of McTIP1;2 was arrested by pretreatment with brefeldin A, wortmannin, and cytochalasin D, inhibitors of vesicle trafficking-related processes. Evidence suggests a role for glycosylation and involvement of a cAMP-dependent signaling pathway in McTIP1;2 redistribution. McTIP1;2 redistribution to endosomal compartments may be part of a homeostatic process to restore and maintain cellular osmolarity under osmotic-stress conditions.
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