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2018 ; 17
(1
): 78
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SALL1 functions as a tumor suppressor in breast cancer by regulating cancer cell
senescence and metastasis through the NuRD complex
#MMPMID29625565
Ma C
; Wang F
; Han B
; Zhong X
; Si F
; Ye J
; Hsueh EC
; Robbins L
; Kiefer SM
; Zhang Y
; Hunborg P
; Varvares MA
; Rauchman M
; Peng G
Mol Cancer
2018[Apr]; 17
(1
): 78
PMID29625565
show ga
BACKGROUND: SALL1 is a multi-zinc finger transcription factor that regulates
organogenesis and stem cell development, but the role of SALL1 in tumor biology
and tumorigenesis remains largely unknown. METHODS: We analyzed SALL1 expression
levels in human and murine breast cancer cells as well as cancer tissues from
different types of breast cancer patients. Using both in vitro co-culture system
and in vivo breast tumor models, we investigated how SALL1 expression in breast
cancer cells affects tumor cell growth and proliferation, metastasis, and cell
fate. Using the gain-of function and loss-of-function strategies, we dissected
the molecular mechanism responsible for SALL1 tumor suppressor functions.
RESULTS: We demonstrated that SALL1 functions as a tumor suppressor in breast
cancer, which is significantly down-regulated in the basal like breast cancer and
in estrogen receptor (ER), progesterone receptor (PR) and epidermal growth factor
receptor 2 (HER2) triple negative breast cancer patients. SALL1 expression in
human and murine breast cancer cells inhibited cancer cell growth and
proliferation, metastasis, and promoted cell cycle arrest. Knockdown of SALL1 in
breast cancer cells promoted cancer cell growth, proliferation, and colony
formation. Our studies revealed that tumor suppression was mediated by
recruitment of the Nucleosome Remodeling and Deacetylase (NuRD) complex by SALL1,
which promoted cancer cell senescence. We further demonstrated that the mechanism
of inhibition of breast cancer cell growth and invasion by SALL1-NuRD depends on
the p38 MAPK, ERK1/2, and mTOR signaling pathways. CONCLUSION: Our studies
indicate that the developmental control gene SALL1 plays a critical role in tumor
suppression by recruiting the NuRD complex and thereby inducing cell senescence
in breast cancer cells.
|*Down-Regulation
[MESH]
|Animals
[MESH]
|Cell Line, Tumor
[MESH]
|Cell Proliferation
[MESH]
|Cellular Senescence
[MESH]
|Coculture Techniques
[MESH]
|Female
[MESH]
|Gene Expression Regulation, Neoplastic
[MESH]
|Humans
[MESH]
|MCF-7 Cells
[MESH]
|Mi-2 Nucleosome Remodeling and Deacetylase Complex/*metabolism
[MESH]