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Cited by 191

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Loss of PALS1 Expression Leads to Tight Junction and Polarity Defects

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Straight, Samuel W., Shin, Kunyoo, Fogg, Vanessa C., Fan, Shuling, Liu, Chia-Jen, Roh, Michael, Margolis, Ben·2004·Molecular Biology of the Cell

Abstract

Prior work in our laboratory established a connection between the PALS1/PATJ/CRB3 and Par6/Par3/aPKC protein complexes at the tight junction of mammalian epithelial cells. Utilizing a stable small interfering RNA expression system, we have markedly reduced expression of the tight junction-associated protein PALS1 in MDCKII cells. The loss of PALS1 resulted in a corresponding loss of expression of PATJ, a known binding partner of PALS1, but had no effect on the expression of CRB3. However, the absence of PALS1 and PATJ expression did result in the decreased association of CRB3 with members of the Par6/Par3/aPKC protein complex. The consequences of the loss of PALS1 and PATJ were exhibited by a delay in the polarization of MDCKII monolayers after calcium switch, a decrease in the transepithelial electrical resistance, and by the inability of these cells to form lumenal cysts when grown in a collagen gel matrix. These defects in polarity determination may be the result of the lack of recruitment of aPKC to the tight junction in PALS1-deficient cells, as observed by confocal microscopy, and subsequent alterations in downstream signaling events.

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Metadata

Authors
Straight, S. W., Shin, K., Fogg, V. C., Fan, S., Liu, C.-J., Roh, M., & Margolis, B.
Venue
Molecular Biology of the Cell
Published
2004-04
Volume
15
Issue
4
Pages
1981-1990
ISSN
  • 1059-1524 (ISSN-L)
  • 1939-4586
OpenAlex
W2099626566
Cited by
191
References
6
FWCI
10.11
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Loss of PALS1 Expression Leads to Tight Junction and Polarity Defects. https://app.cochat.ai/papers/10.1091/mbc.e03-08-0620
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Straight, S. W., Shin, K., Fogg, V. C., Fan, S., Liu, C.-J., Roh, M., & Margolis, B. (2004). Loss of PALS1 Expression Leads to Tight Junction and Polarity Defects. Molecular Biology of the Cell. https://doi.org/10.1091/mbc.e03-08-0620

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