The MUC1 heterodimeric oncoprotein is aberrantly expressed at high levels in over 90% of human breast cancers. The MUC1 N-terminal subunit (MUC1-N) is a mucin-type glycoprotein that disrupts cell-cell and cell-extracellular matrix interactions. The MUC1 C-terminal subunit (MUC1-C) binds to the Wnt pathway effector, ?-catenin, and functions as a transmembrane receptor. Our work has also demonstrated that MUC1 interacts with EGFR, ErbB2, c-Src and GSK32, indicating that MUC1 integrates the ErbB receptor and Wnt signaling pathways. Other studies supported by this grant have demonstrated that MUC1-C is targeted (i) to the nucleus where it functions in the regulation of gene transcription, and (ii) to mitochondria where it attenuates permeabilization of the mitochondrial outer membrane. These findings have provided new insights into the potential role of MUC1 in the development of human breast carcinomas. What is needed now, at least in part, is a more precise understanding of the biologic significance of MUC1 in breast cancer. Our hypothesis is that MUC1 functions physiologically in the protection of normal mammary epithelial cells and that the MUC1 gene is activated by the heregulin (HRG)-induced stress response. Our hypothesis is also that the MUC1-C subunit transduces signals from the cell membrane to the nucleus and mitochondria that confer a growth and survival response to stress. The overexpression of MUC1 as found in most human breast cancers is therefore proposed as a mechanism by which physiologic MUC1 functions have been exploited in the aberrant regulation of tumor growth and survival.
The Specific Aims are: 1) To define the role of Muc1 in mammary gland tumorigenesis;2) To elucidate the mechanisms responsible for upregulation of MUC1 expression in nontransformed and malignant mammary epithelial cells;3) To determine the functional significance of the interaction between MUC1 and galectin-3 on cell surface signaling;4) To define the effects of nuclear MUC1-C on occupancy and activation of Wnt target genes;and 5) To assess the role of MUC1-C in restraining apoptosis in the cytosol and at the mitochondrial outer membrane.

Public Health Relevance

Breast cancer is one of the leading causes of death among women. The MUC1 protein contributes to the development of breast cancer in experimental models and is expressed at high levels in over 90% of human breast tumors. Our proposed research on MUC1 should provide a better understanding of the causes of breast cancer and potentially new opportunities for treatment.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA097098-09
Application #
8067074
Study Section
Tumor Cell Biology Study Section (TCB)
Program Officer
Sathyamoorthy, Neeraja
Project Start
2002-07-01
Project End
2012-06-30
Budget Start
2011-06-01
Budget End
2012-06-30
Support Year
9
Fiscal Year
2011
Total Cost
$358,868
Indirect Cost
Name
Dana-Farber Cancer Institute
Department
Type
DUNS #
076580745
City
Boston
State
MA
Country
United States
Zip Code
02215
Rajabi, Hasan; Hiraki, Masayuki; Kufe, Donald (2018) MUC1-C activates polycomb repressive complexes and downregulates tumor suppressor genes in human cancer cells. Oncogene 37:2079-2088
Panchamoorthy, Govind; Jin, Caining; Raina, Deepak et al. (2018) Targeting the human MUC1-C oncoprotein with an antibody-drug conjugate. JCI Insight 3:
Stroopinsky, Dina; Rajabi, Hasan; Nahas, Myrna et al. (2018) MUC1-C drives myeloid leukaemogenesis and resistance to treatment by a survivin-mediated mechanism. J Cell Mol Med :
Hiraki, Masayuki; Maeda, Takahiro; Mehrotra, Neha et al. (2018) Targeting MUC1-C suppresses BCL2A1 in triple-negative breast cancer. Signal Transduct Target Ther 3:13
Gupta, Dikshi; Kumar, Manoj; Tyagi, Priyanka et al. (2018) Concomitant Delivery of Paclitaxel and NuBCP-9 peptide for synergistic enhancement of cancer therapy. Nanomedicine 14:1301-1313
Maeda, Takahiro; Hiraki, Masayuki; Jin, Caining et al. (2018) MUC1-C Induces PD-L1 and Immune Evasion in Triple-Negative Breast Cancer. Cancer Res 78:205-215
Ahmad, Rehan; Alam, Maroof; Hasegawa, Masanori et al. (2017) Targeting MUC1-C inhibits the AKT-S6K1-elF4A pathway regulating TIGAR translation in colorectal cancer. Mol Cancer 16:33
Rajabi, Hasan; Hiraki, Masayuki; Tagde, Ashujit et al. (2017) MUC1-C activates EZH2 expression and function in human cancer cells. Sci Rep 7:7481
Hiraki, M; Maeda, T; Bouillez, A et al. (2017) MUC1-C activates BMI1 in human cancer cells. Oncogene 36:2791-2801
Yin, Li; Tagde, Ashujit; Gali, Reddy et al. (2017) MUC1-C is a target in lenalidomide resistant multiple myeloma. Br J Haematol 178:914-926

Showing the most recent 10 out of 81 publications