MUC1 regulates nuclear localization and function of the epidermal growth factor receptor

Benjamin G. Bitler, Aarthi Goverdhan, Joyce Schroeder

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Alteration of protein trafficking and localization is associated with several diseases, including cystic fibrosis, breast cancer, colorectal cancer, leukemia and diabetes. Specifically, aberrant nuclear localization of the epidermal growth factor receptor (EGFR), a receptor tyrosine kinase, is a poor prognostic indicator in several epithelial carcinomas. It is now appreciated that in addition to signaling from the plasma membrane, EGFR also trafficks to the nucleus, and can directly bind the promoter regions of genes encoding cyclin D1 (CCND1) and B-Myb (MYBL2). We have previously established that loss of MUC1 in an EGFR-dependent transgenic mouse model of breast cancer correlates with the loss of cyclin D1 expression. Here, we provide evidence for a novel regulatory function of MUC1 in the trafficking and nuclear activity of EGFR. We found that MUC1 and EGFR interact in the nucleus of breast cancer cells, which promotes the accumulation of chromatin-bound EGFR. Additionally, the presence of MUC1 results in significant colocalization of EGFR and phosphorylated RNA polymerase II, indicating that MUC1 influences the association of EGFR with transcriptionally active promoter regions. Importantly, we found that the loss of MUC1 expression resulted in a decrease in the interaction between EGFR and the CCND1 promoter, which translated to a significant decrease in cyclin D1 protein expression. This data offers insights into a novel regulatory mechanism of EGFR nuclear function and could have important implications for evaluating nuclear localization in cancer.

Original languageEnglish (US)
Pages (from-to)1716-1723
Number of pages8
JournalJournal of Cell Science
Volume123
Issue number10
DOIs
StatePublished - May 15 2010

Fingerprint

Epidermal Growth Factor Receptor
Cyclin D1
Breast Neoplasms
Genetic Promoter Regions
Cyclin B
RNA Polymerase II
Receptor Protein-Tyrosine Kinases
Protein Transport
Cystic Fibrosis
Transgenic Mice
Chromatin
Colorectal Neoplasms
Leukemia
Cell Membrane
Carcinoma

Keywords

  • Breast cancer
  • Cyclin D1
  • EGFR
  • MUC1
  • Nuclear translocation

ASJC Scopus subject areas

  • Cell Biology
  • Medicine(all)

Cite this

MUC1 regulates nuclear localization and function of the epidermal growth factor receptor. / Bitler, Benjamin G.; Goverdhan, Aarthi; Schroeder, Joyce.

In: Journal of Cell Science, Vol. 123, No. 10, 15.05.2010, p. 1716-1723.

Research output: Contribution to journalArticle

Bitler, Benjamin G. ; Goverdhan, Aarthi ; Schroeder, Joyce. / MUC1 regulates nuclear localization and function of the epidermal growth factor receptor. In: Journal of Cell Science. 2010 ; Vol. 123, No. 10. pp. 1716-1723.
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