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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 Br+J+Haematol
2014 ; 166
(6
): 862-74
Nephropedia Template TP
gab.com Text
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English Wikipedia
SL-401 and SL-501, targeted therapeutics directed at the interleukin-3 receptor,
inhibit the growth of leukaemic cells and stem cells in advanced phase chronic
myeloid leukaemia
#MMPMID24942980
Frolova O
; Benito J
; Brooks C
; Wang RY
; Korchin B
; Rowinsky EK
; Cortes J
; Kantarjian H
; Andreeff M
; Frankel AE
; Konopleva M
Br J Haematol
2014[Sep]; 166
(6
): 862-74
PMID24942980
show ga
While imatinib and other tyrosine kinase inhibitors (TKIs) are highly efficacious
in the treatment of chronic myeloid leukaemia (CML), some patients become
refractory to these therapies. After confirming that interleukin-3 receptor
(IL3R, CD123) is highly expressed on CD34(+) /CD38(-) BCR-ABL1(+) CML stem cells,
we investigated whether targeting IL3R with diphtheria toxin (DT)-IL3 fusion
proteins SL-401 (DT388 -IL3) and SL-501 (DT388 -IL3[K116W]) could eradicate these
stem cells. SL-401 and SL-501 inhibited cell growth and induced apoptosis in the
KBM5 cell line and its TKI-resistant KBM5-STI subline. Combinations of imatinib
with these agents increased apoptosis in KBM5 and in primary CML cells. In six
primary CML samples, including CML cells harbouring the ABL1 T315I mutation,
SL-401 and SL-501 decreased the absolute numbers of viable CD34(+) /CD38(-)
/CD123(+) CML progenitor cells by inducing apoptosis. IL3-targeting agents
reduced clonogenic growth and diminished the fraction of primitive long-term
culture-initiating cells in samples from patients with advanced phase CML that
were resistant to TKIs or harboured an ABL1 mutation. Survival was also extended
in a mouse model of primary TKI-resistant CML blast crisis. These data suggest
that the DT-IL3 fusion proteins, SL-401 and SL-501, deplete CML stem cells and
may increase the effectiveness of current CML treatment, which principally
targets tumour bulk.