Alteration of the MT1 melatonin receptor gene and its expression in primary human breast tumors and breast cancer cell lines

  • Ling Lai
  • Lin Yuan
  • Qi Cheng
  • Chunmin Dong
  • Lulu Mao
  • Steven Marc Hill
Preclinical Study

Abstract

The MT1 melatonin receptor is bound and activated by the pineal hormone melatonin. This G protein-coupled melatonin receptor is expressed in human breast tumor cell lines, and when activated, mediates the growth-suppressive and steroid hormone/nuclear receptor modulatory actions of melatonin on breast tumor cells. In the current studies, we have examined the expression of the MT1 receptor in breast cancer cell lines and primary human breast tumors and correlated MT1 receptor expression with the deletion, rearrangement and amplification of the MT1 gene and established markers of breast cancer such as tumor size, stage, estrogen receptor alpha (ERα) and progesterone receptor (PR) expression. Theses studies suggest amplification of the MT1 gene in some breast tumors and an inverse correlation with ERα, PR and MT1 protein expression. Furthermore, these approaches employing immunohistochemical and immunofluorescent/confocal microscopic studies demonstrate that the MT1 receptor is localized to the caveoli and that MT1 expression in MCF-7 breast cancer cells can be repressed by estradiol and melatonin.

Keywords

Melatonin MT1 receptor Human breast tumors 

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Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  • Ling Lai
    • 1
  • Lin Yuan
    • 1
  • Qi Cheng
    • 1
  • Chunmin Dong
    • 1
  • Lulu Mao
    • 1
  • Steven Marc Hill
    • 1
    • 2
  1. 1.Department of Structural & Cellular Biology, Tulane University Health Sciences CenterTulane University School of MedicineNew OrleansUSA
  2. 2.Tulane Cancer CenterTulane University School of MedicineNew OrleansUSA

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