TY - JOUR
T1 - Pre-clinical evaluation of the proteasome inhibitor ixazomib against bortezomib-resistant leukemia cells and primary acute leukemia cells
AU - Roeten, Margot S.F.
AU - van Meerloo, Johan
AU - Kwidama, Zinia J.
AU - Huizen, Giovanna Ter
AU - Segerink, Wouter H.
AU - Zweegman, Sonja
AU - Kaspers, Gertjan J.L.
AU - Jansen, Gerrit
AU - Cloos, Jacqueline
N1 - Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/3
Y1 - 2021/3
N2 - At present, 20–30% of children with acute leukemia still relapse from current chemotherapy protocols, underscoring the unmet need for new treatment options, such as proteasome inhibition. Ixazomib (IXA) is an orally available proteasome inhibitor, with an improved safety profile compared to Bortezomib (BTZ). The mechanism of action (proteasome subunit inhibition, apoptosis induction) and growth inhibitory potential of IXA vs BTZ were tested in vitro in human (BTZ-re-sistant) leukemia cell lines. Ex vivo activity of IXA vs BTZ was analyzed in 15 acute lymphoblastic leukemia (ALL) and 9 acute myeloid leukemia (AML) primary pediatric patient samples. BTZ demonstrated more potent inhibitory effects on constitutive β5 and immunoproteasome β5i proteasome subunit activity; however, IXA more potently inhibited β1i subunit than BTZ (70% vs 29% at 2.5 nM). In ALL/AML cell lines, IXA conveyed 50% growth inhibition at low nanomolar concentrations, but was ~10-fold less potent than BTZ. BTZ-resistant cells (150–160 fold) displayed similar (100-fold) cross-resistance to IXA. Finally, IXA and BTZ exhibited anti-leukemic effects for primary ex vivo ALL and AML cells; mean LC50 (nM) for IXA: 24 ± 11 and 30 ± 8, respectively, and mean LC50 for BTZ: 4.5 ± 1 and 11 ± 4, respectively. IXA has overlapping mechanisms of action with BTZ and showed anti-leukemic activity in primary leukemic cells, encouraging further pre-clinical in vivo evaluation.
AB - At present, 20–30% of children with acute leukemia still relapse from current chemotherapy protocols, underscoring the unmet need for new treatment options, such as proteasome inhibition. Ixazomib (IXA) is an orally available proteasome inhibitor, with an improved safety profile compared to Bortezomib (BTZ). The mechanism of action (proteasome subunit inhibition, apoptosis induction) and growth inhibitory potential of IXA vs BTZ were tested in vitro in human (BTZ-re-sistant) leukemia cell lines. Ex vivo activity of IXA vs BTZ was analyzed in 15 acute lymphoblastic leukemia (ALL) and 9 acute myeloid leukemia (AML) primary pediatric patient samples. BTZ demonstrated more potent inhibitory effects on constitutive β5 and immunoproteasome β5i proteasome subunit activity; however, IXA more potently inhibited β1i subunit than BTZ (70% vs 29% at 2.5 nM). In ALL/AML cell lines, IXA conveyed 50% growth inhibition at low nanomolar concentrations, but was ~10-fold less potent than BTZ. BTZ-resistant cells (150–160 fold) displayed similar (100-fold) cross-resistance to IXA. Finally, IXA and BTZ exhibited anti-leukemic effects for primary ex vivo ALL and AML cells; mean LC50 (nM) for IXA: 24 ± 11 and 30 ± 8, respectively, and mean LC50 for BTZ: 4.5 ± 1 and 11 ± 4, respectively. IXA has overlapping mechanisms of action with BTZ and showed anti-leukemic activity in primary leukemic cells, encouraging further pre-clinical in vivo evaluation.
KW - BTZ resistance
KW - Drug resistance
KW - Ixazomib
KW - Leukemia
KW - Proteasome
KW - Proteasome inhibitor
UR - http://www.scopus.com/inward/record.url?scp=85103862659&partnerID=8YFLogxK
U2 - 10.3390/cells10030665
DO - 10.3390/cells10030665
M3 - Article
C2 - 33802801
AN - SCOPUS:85103862659
SN - 2073-4409
VL - 10
SP - 1
EP - 15
JO - Cells
JF - Cells
IS - 3
M1 - 665
ER -