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Originally published online as doi:10.2353/ajpath.2010.090220 on December 3, 2009

Published online before print December 3, 2009
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(American Journal of Pathology. 2010;176:134-145.)
© 2010 American Society for Investigative Pathology
DOI: 10.2353/ajpath.2010.090220

Tumor Suppressor Scribble Regulates Assembly of Tight Junctions in the Intestinal Epithelium

Andrei I. Ivanov*, Cheryl Young{dagger}, Kyle Den Beste{dagger}, Christopher T. Capaldo{dagger}, Patrick O. Humbert{ddagger}, Patrick Brennwald§, Charles A. Parkos{dagger} and Asma Nusrat{dagger}

From the Department of Medicine,* University of Rochester, Rochester, New York; the Department of Pathology and Laboratory Medicine,{dagger} Emory University, Atlanta, Georgia; the Cell Cycle and Cancer Genetics Laboratory,{ddagger} Research Division, Peter MacCallum Cancer Center, Melbourne, Australia; and the Department of Cell and Developmental Biology,§ University of North Carolina at Chapel Hill, Chapel Hill, North Carolina

Formation of the epithelial barrier and apico-basal cell polarity represent two characteristics and mutually dependent features of differentiated epithelial monolayers. They are controlled by special adhesive structures, tight junctions (TJs), and polarity protein complexes that define the apical and the basolateral plasma membrane. The functional interplay between TJs and polarity complexes remains poorly understood. We investigated the role of Scribble, a basolateral polarity protein and known tumor suppressor, in regulating TJs in human intestinal epithelium. Scribble was enriched at TJs in T84 and SK-CO15 intestinal epithelial cell monolayers and sections of normal human colonic mucosa. siRNA-mediated knockdown of Scribble in SK-CO15 cells attenuated development of epithelial barrier and inhibited TJ reassembly independently of other basolateral polarity proteins Lgl-1 and Dlg-1. Scribble selectively co-imunoprecipitated with TJ protein ZO-1, and ZO-1 was important for Scribble recruitment to intercellular junctions and TJ reassembly. Lastly, Scribble was mislocalized from TJs and its expression down-regulated in interferon-{gamma}-treated T84 cell monolayers and inflamed human intestinal mucosa in vivo. We conclude that Scribble is an important regulator of TJ functions and plasticity in the intestinal epithelium. Down-regulation of Scribble may mediate mucosal barrier breakdown during intestinal inflammation.






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