Galectin-3, a novel centrosome-associated protein, required for epithelial morphogenesis.

Molecular Biology of the Cell
Annett KochDelphine Delacour

Abstract

Galectin-3 is a beta-galactoside-binding protein widely expressed in all epithelia where it is involved in tissue homeostasis and cancer progression. We recently reported unique abnormalities in the identity of membrane domains in galectin-3 null mutant mice, suggesting that galectin-3 may participate in epithelial polarity program. We investigated the potential role of galectin-3 on early events in polarization of epithelial renal cells, using three-dimensional cultures of MDCK cells and also galectin-3 null mutant mouse kidneys. We show that depletion in galectin-3 systematically leads to severe perturbations of microtubular network associated with defects in membrane compartimentation, both in vitro and in vivo. Moreover, the absence of galectin-3 impinges on the morphology of the primary cilium, which is three times longer and unusually shaped. By immunological and biochemical approaches, we could demonstrate that endogenous galectin-3 is normally associated with basal bodies and centrosomes, where it closely interacts with core proteins, such as centrin-2. However, this association transiently occurs during the process of epithelial polarization. Interestingly, galectin-3-depleted cells contain numerous centrosome-like str...Continue Reading

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Methods Mentioned

BETA
transfections
transfecting
transfection
confocal microscopy
density gradient centrifugation
immunoprecipitation

Software Mentioned

Lucia
Volocity

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