Glycobiology Advance Access originally published online on September 15, 2005
Glycobiology 2006 16(1):36-45; doi:10.1093/glycob/cwj035
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Exploring the role of galectin 3 in kidney function: a genetic approach
2 INSERM U426, 16 rue Henri Huchard, 75870 Paris Cedex 18, France; 3 IFR 2 Claude Bernard, 16 rue Henri Huchard, 75870 Paris Cedex 18, France; 4 Université Paris 7, 2 place Jussieu, 75005 Paris, France; 5 Program in Membrane Biology/Renal Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114; 6 Service de Néphrologie, Hôpital Xavier Bichat, 46 rue Henri Huchard, 75870 Paris Cedex 18, France; 7 Centre dExplorations Fonctionnelles Intégrées, IFR 2 Claude Bernard, 16 rue Henri Huchard, 75870 Paris Cedex 18, France; 8 Association Claude Bernard, Centre de recherche de génétique et pathologie moléculaire de lhématopoièse, 16 rue Henri Huchard, 75870 Paris Cedex 18, France; 9 Institut Jacques Monod, CNRS UMR 7592, Universités Paris 6 and Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, France; 10 INSERM U478, 16 rue Henri Huchard, 75870 Paris Cedex 18, France; and 11 Equipe EA 3102, Service dAnatomopathologie, Hôpital Robert Debré, 75019 Paris, France
1 To whom correspondence should be addressed; e-mail: poirier{at}ijm.jussieu.fr
Received on May 30, 2005; revised on August 31, 2005; accepted on September 1, 2005
Galectin 3 belongs to a family of glycoconjugate-binding proteins that participate in cellular homeostasis by modulating cell growth, adhesion, and signaling. We studied adult galectin 3 null mutant (Gal 3/) and wild-type (WT) mice to gain insights into the role of galectin 3 in the kidney. By immunofluorescence, galectin 3 was found in collecting duct (CD) principal and intercalated cells in some regions of the kidney, as well as in the thick ascending limbs at lower levels. Compared to WT mice, Gal 3/ mice had ~11% fewer glomeruli (p < 0.04), associated with kidney hypertrophy (p < 0.006). In clearance experiments, urinary chloride excretion was found to be higher in Gal 3/ than in WT mice (p < 0.04), but there was no difference in urinary bicarbonate excretion, in glomerular filtration, or urinary flow rates. Under chronic low sodium diet, Gal 3/ mice had lower extracellular fluid (ECF) volume than WT mice (p < 0.05). Plasma aldosterone concentration was higher in Gal 3/ than in WT mice (p < 0.04), which probably caused the observed increase in
-epithelial sodium channel (
-ENaC) protein abundance in the mutant mice (p < 0.001). Chronic high sodium diet resulted paradoxically in lower blood pressure (p < 0.01) in Gal 3/ than in WT. We conclude that Gal 3/ mice have mild renal chloride loss, which causes chronic ECF volume contraction and reduced blood pressure levels.
Key words: blood pressure / body fluid volumes / hyperfiltration / Bartters like syndrome / null mutant mouse
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