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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Oncotarget
2016 ; 7
(51
): 85208-85219
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Sulforaphane inhibits proliferation and invasive activity of everolimus-resistant
kidney cancer cells in vitro
#MMPMID27863441
Juengel E
; Maxeiner S
; Rutz J
; Justin S
; Roos F
; Khoder W
; Tsaur I
; Nelson K
; Bechstein WO
; Haferkamp A
; Blaheta RA
Oncotarget
2016[Dec]; 7
(51
): 85208-85219
PMID27863441
show ga
Although the mechanistic target of rapamycin (mTOR) inhibitor, everolimus, has
improved the outcome of patients with renal cell carcinoma (RCC), improvement is
temporary due to the development of drug resistance. Since many patients
encountering resistance turn to alternative/complementary treatment options, an
investigation was initiated to evaluate whether the natural compound,
sulforaphane (SFN), influences growth and invasive activity of
everolimus-resistant (RCCres) compared to everolimus-sensitive (RCCpar) RCC cell
lines in vitro. RCC cells were exposed to different concentrations of SFN and
cell growth, cell proliferation, apoptosis, cell cycle, cell cycle regulating
proteins, the mTOR-akt signaling axis, adhesion to human vascular endothelium and
immobilized collagen, chemotactic activity, and influence on surface integrin
receptor expression were investigated. SFN caused a significant reduction in both
RCCres and RCCpar cell growth and proliferation, which correlated with an
elevation in G2/M- and S-phase cells. SFN induced a marked decrease in the cell
cycle activating proteins cdk1 and cyclin B and siRNA knock-down of cdk1 and
cyclin B resulted in significantly diminished RCC cell growth. SFN also modulated
adhesion and chemotaxis, which was associated with reduced expression of the
integrin subtypes ?5, ?6, and ?4. Distinct differences were seen in RCCres
adhesion and chemotaxis (diminished by SFN) and RCCpar adhesion (enhanced by SFN)
and chemotaxis (not influenced by SFN). Functional blocking of integrin subtypes
demonstrated divergent action on RCC binding and invasion, depending on RCC cell
sensitivity to everolimus. Therefore, SFN administration could hold potential for
treating RCC patients with established resistance towards everolimus.