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First published online July 23, 2003
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Seasonal acclimatization in water flux rate, urine osmolality and kidney water channels in free-living degus: molecular mechanisms, physiological processes and ecological implications

Francisco Bozinovic1,*, Pedro A. Gallardo2, G. Henk Visser3,4 and Arturo Cortés5

1 Center for Advanced Studies in Ecology & Biodiversity and Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile, 6513677
2 Laboratorio de Fisiopatología Molecular, Programa de Fisiopatología, ICBM, Facultad de Medicina, Universidad de Chile, Santiago, Chile, 6513677
3 Centre for Isotope Research, Nijenborgh 4, 9747 AG Groningen, The Netherlands
4 Zoological Laboratory, PO Box 14, 9750 AA Haren, The Netherlands
5 Departamento de Biología, Facultad de Ciencias Universidad de La Serena, Casilla 599, La Serena Chile



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  		Fig. 1. Seasonal pattern of variation in (A) precipitation in the semi-arid habitats of north-central Chile, (B) water influx and efflux in free-living Octodon degus and (C) field urine osmolality in free-living degus. Values are means ± 1 S.D. Sample size (N) is shown in parentheses, and further statistical details are found in Tables 1 and 2.

 


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  		Fig. 2. Seasonal pattern of variation in aquaporin-2 (AQP-2) distribution and regulation in cells of the renal medulla. (A) Immunolabeling for AQP-2 in apical membrane (vertical arrow) and cytosol of inner medullary collecting duct cells during summer. (B) Scarce immunolabeling for AQP-2 can be observed in the same cells during winter. Unlabeled cells in A and B may correspond to intercalated cells. (C,D) Double immunolabeling for AQP-2 (inner medullary collecting duct cells; brown) and AQP-1 (thin descending cells of Henle's loop; blue) during summer and winter, respectively. Note the change in AQP-2 but not in AQP-1 immunoreactivity. (E) Immunoblot of proteins from renal medulla for AQP-2 during summer (lanes 1 and 2) and winter (lanes 3 and 4). Scale bar represents 100 µm in A-D and 50 µm in inserts of A and B.

 




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