Abstract:
:Breast cancer stem cells (BCSCs) are competent to initiate tumor formation and growth and refractory to conventional therapies. Consequently BCSCs are implicated in tumor recurrence. Many signaling cascades associated with BCSCs are critical for epithelial-to-mesenchymal transition (EMT). We developed a model system to mechanistically examine BCSCs in basal-like breast cancer using MCF10AT1 FACS sorted for CD24 (negative/low in BCSCs) and CD44 (positive/high in BCSCs). Ingenuity Pathway Analysis comparing RNA-seq on the CD24-/low versus CD24+/high MCF10AT1 indicates that the top activated upstream regulators include TWIST1, TGFβ1, OCT4, and other factors known to be increased in BCSCs and during EMT. The top inhibited upstream regulators include ESR1, TP63, and FAS. Consistent with our results, many genes previously demonstrated to be regulated by RUNX factors are altered in BCSCs. The RUNX2 interaction network is the top significant pathway altered between CD24-/low and CD24+/high MCF10AT1. RUNX1 is higher in expression at the RNA level than RUNX2. RUNX3 is not expressed. While, human-specific quantitative polymerase chain reaction primers demonstrate that RUNX1 and CDH1 decrease in human MCF10CA1a cells that have grown tumors within the murine mammary fat pad microenvironment, RUNX2 and VIM increase. Treatment with an inhibitor of RUNX binding to CBFβ for 5 days followed by a 7-day recovery period results in EMT suggesting that loss of RUNX1, rather than increase in RUNX2, is a driver of EMT in early stage breast cancer. Increased understanding of RUNX regulation on BCSCs and EMT will provide novel insight into therapeutic strategies to prevent recurrence.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Fritz AJ,Hong D,Boyd J,Kost J,Finstaad KH,Fitzgerald MP,Hanna S,Abuarqoub AH,Malik M,Bushweller J,Tye C,Ghule P,Gordon J,Frietze S,Zaidi SK,Lian JB,Stein JL,Stein GSdoi
10.1002/jcp.29625subject
Has Abstractpub_date
2020-10-01 00:00:00pages
7261-7272issue
10eissn
0021-9541issn
1097-4652journal_volume
235pub_type
杂志文章abstract::Fibronectin is a component of the extracellular matrix of developing microvessels whose role in angiogenesis is poorly understood. This study evaluated the effect of plasma fibronectin on angiogenesis in serum-free collagen gel culture of rat aorta. Aortic explants embedded in collagen gels generated microvascular out...
journal_title:Journal of cellular physiology
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更新日期:1986-02-01 00:00:00
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