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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 Am+J+Transl+Res
2014 ; 6
(3
): 188-205
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Small cell lung cancer cells express the late stage gBK tumor antigen: a possible
immunotarget for the terminal disease
#MMPMID24936214
Hoa NT
; Ge L
; Tajhya RB
; Beeton C
; Cornforth AN
; Abolhoda A
; Lambrecht N
; DaCosta-Iyer M
; Ouyang Y
; Mai AP
; Hong E
; Shon J
; Hickey MJ
; Erickson KL
; Kruse CA
; Jadus MR
Am J Transl Res
2014[]; 6
(3
): 188-205
PMID24936214
show ga
Big Potassium (BK) ion channels have several splice variants. One splice variant
initially described within human glioma cells is called the glioma BK channel
(gBK). Using a gBK-specific antibody, we detected gBK within three human small
cell lung cancer (SCLC) lines. Electrophysiology revealed that functional
membrane channels were found on the SCLC cells. Prolonged exposure to BK channel
activators caused the SCLC cells to swell within 20 minutes and resulted in their
death within five hours. Transduction of BK-negative HEK cells with gBK produced
functional gBK channels. Quantitative RT-PCR analysis using primers specific for
gBK, but not with a lung-specific marker, Sox11, confirmed that advanced,
late-stage human SCLC tissues strongly expressed gBK mRNA. Normal human lung
tissue and early, lower stage SCLC resected tissues very weakly expressed this
transcript. Immunofluorescence using the anti-gBK antibody confirmed that SCLC
cells taken at the time of the autopsy intensely displayed this protein. gBK may
represent a late-stage marker for SCLC. HLA-A*0201 restricted human CTL were
generated in vitro using gBK peptide pulsed dendritic cells. The exposure of SCLC
cells to interferon-? (IFN-?) increased the expression of HLA; these treated
cells were killed by the CTL better than non-IFN-? treated cells even though the
IFN-? treated SCLC cells displayed diminished gBK protein expression. Prolonged
incubation with recombinant IFN-? slowed the in vitro growth and prevented
transmigration of the SCLC cells, suggesting IFN-? might inhibit tumor growth in
vivo. Immunotherapy targeting gBK might impede advancement to the terminal stage
of SCLC via two pathways.