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2015 ; 10
(4
): e0122442
Nephropedia Template TP
Huynh TP
; Barwe SP
; Lee SJ
; McSpadden R
; Franco OE
; Hayward SW
; Damoiseaux R
; Grubbs SS
; Petrelli NJ
; Rajasekaran AK
PLoS One
2015[]; 10
(4
): e0122442
PMID25836370
show ga
Glucocorticoids are commonly used as palliative or chemotherapeutic clinical
agents for treatment of a variety of cancers. Although steroid treatment is
beneficial, the mechanisms by which steroids improve outcome in cancer patients
are not well understood. Na,K-ATPase beta-subunit isoform 1 (NaK-?1) is a
cell-cell adhesion molecule, and its expression is down-regulated in cancer cells
undergoing epithelial-to mesenchymal-transition (EMT), a key event associated
with cancer progression to metastatic disease. In this study, we performed
high-throughput screening to identify small molecules that could up-regulate
NaK-?1 expression in cancer cells. Compounds related to the glucocorticoids were
identified as drug candidates enhancing NaK-?1 expression. Of these compounds,
triamcinolone, dexamethasone, and fluorometholone were validated to increase
NaK-?1 expression at the cell surface, enhance cell-cell adhesion, attenuate
motility and invasiveness and induce mesenchymal to epithelial like transition of
renal cell carcinoma (RCC) cells in vitro. Treatment of NaK-?1 knockdown cells
with these drug candidates confirmed that these compounds mediate their effects
through up-regulating NaK-?1. Furthermore, we demonstrated that these compounds
attenuate tumor growth in subcutaneous RCC xenografts and reduce local
invasiveness in orthotopically-implanted tumors. Our results strongly indicate
that the addition of glucocorticoids in the treatment of RCC may improve outcome
for RCC patients by augmenting NaK-?1 cell-cell adhesion function.