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Analysis of the distribution and phosphorylation state of ZO-1 in MDCK and nonepithelial cells

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Abstract

We have examined the distribution and extent of phosphorylation of the tight junction-associated protein ZO-1 in the epithelial MDCK cell line, and in three cell types that do not form tight junctions: S180 (sarcoma) cells, S180 cells transfected with E-cadherin (S180L), and primary cultures of astrocytes. In shortterm calcium chelation experiments on MDCK cells, removal of extracellular calcium caused cells to pull apart. However, ZO-1 remained concentrated at the plasma membrane and no change in ZO-1 phosphorylation was observed. Maintenance of MDCK cells in low calcium medium, conditions where no tight junctions are found, resulted in altered ZO-1 distribution and lower total phosphorylation of the protein. In S180 cells, ZO-1 was diffusely distributed along the entire cell surface, with concentration of the antigen in motile regions of the cell. Cell-cell contact was not a prerequisite for ZO-1 localization at the plasma membrane in this cell type, and the phosphate content of ZO-1 was found to be lower in S180 cells relative to MDCK cells. Expression of Ecadherin in S180L cells did not alter either the distribution or phosphorylation of ZO-1. In contrast to S180 cells, ZO-1 in primary cultures of astrocytes was concentrated at sites of cell-cell contact, and the phosphorylation state was the same as that in control MDCK cells. Comparison of one-dimensional proteolytic digests of 32P-labeled ZO-1 revealed the phosphorylation of two peptides in control MDCK cells that was absent in both MDCK cells grown in low calcium and in S180 cells.

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Authors and Affiliations

  1. Department of Anatomy and Cell Biology, University of Alberta, T6G 2H7, Edmonton, Alberta, Canada

    A. G. Howarth & B. R. Stevenson

  2. Department of Molecular and Cellular Biology, University of California at Berkeley, 94720-0001, Berkeley, California

    K. L. Singer

Authors
  1. A. G. Howarth
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  2. K. L. Singer
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  3. B. R. Stevenson
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Additional information

We would like to thank Cheryl Richards for her help with the cell culture and immunohistochemistry; David Begg, Gary Firestone, Vik Maraj, Manijeh Pasdar and Colin Rasmussen for helpful discussions; Jaclyn Peebles and Greg Morrison for help with graphics and photography; and Grace Martin and Bob Campenot for rat tail collagen. We are grateful to all the members of our laboratories for their friendship, advice and support. This work was supported by an Establishment Award to B.R.S. from the Alberta Heritage Foundation for Medical Research and grants to B.R.S. from the Kidney Foundation of Canada and the Medical Research Council of Canada. A.H. is funded by a Studentship from the AHFMR. K.L.S. was supported by a grant from the National Institutes of Health (DK-42799) to Gary L. Firestone. B.R.S. is a Medical Research Council of Canada and AHFMR Scholar.

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Howarth, A.G., Singer, K.L. & Stevenson, B.R. Analysis of the distribution and phosphorylation state of ZO-1 in MDCK and nonepithelial cells. J. Membarin Biol. 137, 261–270 (1994). https://doi.org/10.1007/BF00232594

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  • DOI: https://doi.org/10.1007/BF00232594

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