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2016 ; 49
(1
): 99-110
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Verapamil inhibits tumor progression of chemotherapy-resistant pancreatic cancer
side population cells
#MMPMID27177126
Zhao L
; Zhao Y
; Schwarz B
; Mysliwietz J
; Hartig R
; Camaj P
; Bao Q
; Jauch KW
; Guba M
; Ellwart JW
; Nelson PJ
; Bruns CJ
Int J Oncol
2016[Jul]; 49
(1
): 99-110
PMID27177126
show ga
Tumor side population (SP) cells display stem-like properties that can be
modulated by treatment with the calcium channel blocker verapamil. Verapamil can
enhance the cytotoxic effects of chemotherapeutic drugs and multidrug resistance
by targeting the transport function of the P-glycoprotein (P-gp). This study
focused on the therapeutic potential of verapamil on stem-like SP tumor cells,
and further investigated its chemosensitizing effects using L3.6pl and AsPC-1
pancreatic carcinoma models. As compared to parental L3.6pl cells (0.9±0.22%),
L3.6pl gemcitabine-resistant cells (L3.6plGres) showed a significantly higher
percentage of SP cells (5.38±0.99%) as detected by Hoechst 33342/FACS assays. The
L3.6plGres SP cells showed stable gemcitabine resistance, enhanced colony
formation ability and increased tumorigenicity. Verapamil effectively inhibited
L3.6plGres and AsPC-1 SP cell proliferation in vitro. A pro-apoptotic effect of
verapamil was observed in L3.6pl cells, but not in L3.6plGres cells, which was
linked to their differential expression of P-gp and equilibrative nucleoside
transporter-1 (ENT-1). In an orthotopic pancreatic cancer mouse model, both low
and high dose verapamil was shown to substantially reduce L3.6plGres-SP cell
tumor growth and metastasis, enhance tumor apoptosis, and reduce microvascular
density.
|ATP Binding Cassette Transporter, Subfamily B, Member 1/*biosynthesis
[MESH]