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2017 ; 41
(4
): 392-407.e6
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Discovery of Stromal Regulatory Networks that Suppress Ras-Sensitized Epithelial
Cell Proliferation
#MMPMID28535374
Liu H
; Dowdle JA
; Khurshid S
; Sullivan NJ
; Bertos N
; Rambani K
; Mair M
; Daniel P
; Wheeler E
; Tang X
; Toth K
; Lause M
; Harrigan ME
; Eiring K
; Sullivan C
; Sullivan MJ
; Chang SW
; Srivastava S
; Conway JS
; Kladney R
; McElroy J
; Bae S
; Lu Y
; Tofigh A
; Saleh SMI
; Fernandez SA
; Parvin JD
; Coppola V
; Macrae ER
; Majumder S
; Shapiro CL
; Yee LD
; Ramaswamy B
; Hallett M
; Ostrowski MC
; Park M
; Chamberlin HM
; Leone G
Dev Cell
2017[May]; 41
(4
): 392-407.e6
PMID28535374
show ga
Mesodermal cells signal to neighboring epithelial cells to modulate their
proliferation in both normal and disease states. We adapted a Caenorhabditis
elegans organogenesis model to enable a genome-wide mesodermal-specific RNAi
screen and discovered 39 factors in mesodermal cells that suppress the
proliferation of adjacent Ras pathway-sensitized epithelial cells. These
candidates encode components of protein complexes and signaling pathways that
converge on the control of chromatin dynamics, cytoplasmic polyadenylation, and
translation. Stromal fibroblast-specific deletion of mouse orthologs of several
candidates resulted in the hyper-proliferation of mammary gland epithelium.
Furthermore, a 33-gene signature of human orthologs was selectively enriched in
the tumor stroma of breast cancer patients, and depletion of these factors from
normal human breast fibroblasts increased proliferation of co-cultured breast
cancer cells. This cross-species approach identified unanticipated regulatory
networks in mesodermal cells with growth-suppressive function, exposing the
conserved and selective nature of mesodermal-epithelial communication in
development and cancer.