Proteomic and transcriptomic profiling identifies mediators of anchorage-independent growth and roles of inhibitor of differentiation proteins in invasive lobular carcinoma
Abstract
Invasive lobular carcinoma (ILC) is a histological subtype of breast cancer with distinct molecular and clinical features from the more common subtype invasive ductal carcinoma (IDC). ILC cells exhibit anchorage-independent growth in ultra-low attachment (ULA) suspension cultures, which is largely attributed to the loss of E-cadherin. In addition to anoikis resistance, herein we show that human ILC cell lines exhibit enhanced cell proliferation in ULA cultures as compared to IDC cells. Proteomic comparison of ILC and IDC cell lines identified induction of PI3K/Akt and p90-RSK pathways specifically in ULA culture in ILC cells. Further transcriptional profiling uncovered unique upregulation of the inhibitors of differentiation family transcription factors ID1 and ID3 in ILC ULA culture, the knockdown of which diminished the anchorage-independent growth of ILC cell lines through cell cycle arrest. We find that ID1 and ID3 expression is higher in human ILC tumors as compared to IDC, correlated with worse prognosis uniquely in patients with ILC and associated with upregulation of angiogenesis and matrisome-related genes. Altogether, our comprehensive study of anchorage independence in human ILC cell lines provides mechanistic insights and clinical implications for metastatic dissemination of ILC and implicates ID1 and ID3 as novel drivers and therapeutic targets for lobular breast cancer.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 13, 2020
- Source ID
- 10.1038/s41598-020-68141-9
Entities
People
- Adrian V Lee
- Ashuvinee Elangovan
- Emily A. Bossart
- Kai Ding
- Kevin M Levine
- Laura Savariau
- Nancy E. Davidson
- Nilgun Tasdemir
- Steffi Oesterreich
- Tian Du
Organizations
- Metastatic Breast Cancer Network
- National Institutes of Health
- Susan G. Komen for the Cure
- The Breast Cancer Research Foundation
- United States Department of Defense