Breast Cancer Research and Treatment

, Volume 132, Issue 2, pp 487–498

Pilot and feasibility study: prospective proteomic profiling of mammary epithelial cells from high-risk women provides evidence of activation of pro-survival pathways

Authors

    • Division of Medical OncologyDuke University Medical Center
  • Michelle M. Troch
    • Division of Medical OncologyDuke University Medical Center
  • William T. Barry
    • Department of Biostatistics & BioinformaticsDuke University Medical Center
  • Gloria Broadwater
    • Department of Biostatistics & BioinformaticsDuke University Medical Center
  • Emanuel F. PetricoinIII
    • Center for Applied Proteomics and Molecular MedicineGeorge Mason University
  • Julia Wulfkuhle
    • Center for Applied Proteomics and Molecular MedicineGeorge Mason University
  • Lance A. Liotta
    • Center for Applied Proteomics and Molecular MedicineGeorge Mason University
  • Siya Lem
    • Division of Medical OncologyDuke University Medical Center
  • Joseph C. BakerJr.
    • Division of Medical OncologyDuke University Medical Center
  • Anne C. Ford
    • Department of Obstetrics and GynecologyDuke University Medical Center
  • Lee G. Wilke
    • Division of General SurgeryUniversity of Wisconsin
  • Carola Zalles
    • Texas A&M Health Sciences CenterCollege of Medicine
  • Nicole M. Kuderer
    • Division of Medical OncologyDuke University Medical Center
  • Abigail W. Hoffman
    • Division of Medical OncologyDuke University Medical Center
  • Melanie Shivraj
    • Division of Medical OncologyDuke University Medical Center
  • Priya Mehta
    • Division of Medical OncologyDuke University Medical Center
  • Jamila Williams
    • Division of Medical OncologyDuke University Medical Center
  • Nora Tolbert
    • Division of Medical OncologyDuke University Medical Center
  • Laurie W. Lee
    • Division of Medical OncologyDuke University Medical Center
  • Patrick G. Pilie
    • Division of Medical OncologyDuke University Medical Center
  • Dihua Yu
    • Department of Molecular and Cellular OncologyMD Anderson Cancer Center
  • Victoria L. Seewaldt
    • Division of Medical OncologyDuke University Medical Center
Preclinical study

DOI: 10.1007/s10549-011-1609-9

Cite this article as:
Ibarra-Drendall, C., Troch, M.M., Barry, W.T. et al. Breast Cancer Res Treat (2012) 132: 487. doi:10.1007/s10549-011-1609-9

Abstract

Normal mammary gland homeostasis requires the coordinated regulation of protein signaling networks. However, we have little prospective information on whether activation of protein signaling occurs in premalignant mammary epithelial cells, as represented by cells with cytological atypia from women who are at high risk for breast cancer. This information is critical for understanding the role of deregulated signaling pathways in the initiation of breast cancer and for developing targeted prevention and/or treatment strategies for breast cancer in the future. In this pilot and feasibility study, we examined the expression of 52 phosphorylated, total, and cleaved proteins in 31 microdissected Random Periareolar Fine Needle Aspiration (RPFNA) samples by high-throughput Reverse Phase Protein Microarray. Unsupervised hierarchical clustering analysis indicated the presence of four clusters of proteins that represent the following signaling pathways: (1) receptor tyrosine kinase/Akt/mammalian target of rapamycin (RTK/Akt/mTOR), (2) RTK/Akt/extracellular signal-regulated kinase (RTK/Akt/ERK), (3) mitochondrial apoptosis, and (4) indeterminate. Clusters 1 through 3 comprised moderately to highly expressed proteins, while Cluster 4 comprised proteins that are lowly expressed in a majority of RPFNA samples. Our exploratory study showed that the interlinked components of mitochondrial apoptosis pathway are highly expressed in all mammary epithelial cells obtained from high-risk women. In particular, the expression levels of anti-apoptotic Bcl-xL and pro-apoptotic Bad are positively correlated in both non-atypical and atypical samples (unadjusted P < 0.0001), suggesting a delicate balance between the pro-apoptotic and anti-apoptotic regulation of cell proliferation during the early steps of mammary carcinogenesis. Our feasibility study suggests that the activation of key proteins along the RTK/Akt pathway may tip this balance to cell survival. Taken together, our results demonstrate the feasibility of mapping proteomic signaling networks in limited RPFNA samples obtained from high-risk women and the promise of developing rational drug targets or preventative strategies for breast cancer in future proteomic studies with a larger cohort of high-risk women.

Keywords

Breast cancer riskAtypical mammary cytologyProtein microarrayBiomarker developmentCell survival

Abbreviations

Apaf-1

Apoptotic protease activating factor-1

Bad

Bcl2-antagonist of cell death

Bax

Bcl2 associated X-protein

Bcl-2

B-cell lymphoma-2

Bid

Bcl2 interacting protein

BRCA1/2

Breast cancer-associated gene 1/2

CK2

Casein kinase II or 2

DCIS

Ductal carcinoma in situ

EGFR

Epidermal growth factor receptor

ER

Estrogen receptor

ErbB

Erythroblastic leukemia viral oncogene homolog

ERK

Extracellular signal-regulated kinase

FADD

Fas-associated via death domain

IHC

Immunohistochemistry

IGF-1R

Insulin-like growth factor receptor

LCIS

Lobular carcinoma in situ

LCM

Laser capture microdissection

mTOR

Mammalian target of rapamycin

OR

Operating room

PI3K

Phosphatidylinositol 3-kinase

PTEN

Phosphatase and tensin homolog

RPFNA

Random Periareolar Fine Needle Aspiration

RPPM

Reverse phase protein microarray

RTK

Receptor tyrosine kinase

Copyright information

© Springer Science+Business Media, LLC. 2011