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2018 ; 215
(1
): 197-216
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Leukemia-specific delivery of mutant NOTCH1 targeted therapy
#MMPMID29158376
Roti G
; Qi J
; Kitara S
; Sanchez-Martin M
; Saur Conway A
; Varca AC
; Su A
; Wu L
; Kung AL
; Ferrando AA
; Bradner JE
; Stegmaier K
J Exp Med
2018[Jan]; 215
(1
): 197-216
PMID29158376
show ga
On-target drug delivery remains a challenge in cancer precision medicine; it is
difficult to deliver a targeted therapy to cancer cells without incurring
toxicity to normal tissues. The SERCA (sarco-endoplasmic reticulum Ca(2+) ATPase)
inhibitor thapsigargin inhibits mutant NOTCH1 receptors compared with wild type
in T cell acute lymphoblastic leukemia (T-ALL), but its administration is
predicted to be toxic in humans. Leveraging the addiction of ALL to folic acid,
we conjugated folate to an alcohol derivative of thapsigargin via a cleavable
ester linkage. JQ-FT is recognized by folate receptors on the plasma membrane and
delivered into leukemia cells as a potent antileukemic agent. In mechanistic and
translational models of T-ALL, we demonstrate NOTCH1 inhibition in vitro and in
vivo. These proof-of-concept studies support the further optimization of this
first-in-class NOTCH1 inhibitor with dual selectivity: leukemia over normal cells
and NOTCH1 mutants over wild-type receptors. Furthermore, tumor-specific
disruption of Notch signaling may overcome legitimate concerns associated with
the tumor suppressor function of nontargeted Notch pathway inhibitors.