Estrogen-dependent expression and subcellular localization of the tight junction protein claudin-4 in HEC-1A endometrial cancer cells

Maria E. Cuevas, Jenna M. Gaska, Andrea C. Gist, Jonathan M. King, Rebecca A. Sheller, Maria C. Todd

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Endometrial cancer is the most common female reproductive cancer in the United States and is associated with deregulated tight junction protein expression. Given the highly estrogen-responsive nature of this tissue, we investigated the effects of estrogen and its agonist, 4-OH TAM, on the expression and subcellular localization of the tight junction protein claudin-4 (CLDN-4), in HEC-1A endometrial cancer cells. In untreated HEC-1A cells, we observed dramatic overexpression of claudin-4 protein. In addition, differential detergent extraction analysis indicated that claudin-4 was localized primarily in the membrane but also found in the cytosolic, nuclear and cytoskeletal fractions. Upon exposure of HEC-1A to estradiol (E2), we observed a biphasic effect both on the overall expression of claudin-4 protein and on its cytosolic and cytoskeletal presence as demonstrated by immunoblot analysis. Immunofluorescence analysis also revealed a biphasic effect of E2 on claudin-4 expression. In contrast, we observed no changes in expression levels nor in the subcellular distribution patterns of claudin-4 in HEC-1A cells treated with different concentrations of 4-OH TAM. The intracellular presence of CLDN-4 coupled with the biphasic effects of E2 on CLDN-4 expression in the cytoskeleton suggest that this protein may be involved in cell signaling to and from TJs.

Original languageEnglish (US)
Pages (from-to)650-656
Number of pages7
JournalInternational journal of oncology
Volume47
Issue number2
DOIs
StatePublished - Aug 1 2015
Externally publishedYes

Keywords

  • Claudin-4
  • Endometrium
  • Estrogen biphasic effect

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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