HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

Effective targeting of STAT5-mediated survival in myeloproliferative neoplasms using ABT-737 combined with rapamycin.

Abstract
Signal transducer and activator of transcription-5 (STAT5) is a critical transcription factor for normal hematopoiesis and its sustained activation is associated with hematologic malignancy. A persistently active mutant of STAT5 (STAT5a(S711F)) associates with Grb2-associated binding protein 2 (Gab2) in myeloid leukemias and promotes growth in vitro through AKT activation. Here we have retrovirally transduced wild-type or Gab2(-/-) mouse bone marrow cells expressing STAT5a(S711F) and transplanted into irradiated recipient mice to test an in vivo myeloproliferative disease model. To target Gab2-independent AKT/mTOR activation, we treated wild-type mice separately with rapamycin. In either case, mice lacking Gab2 or treated with rapamycin showed attenuated myeloid hyperplasia and modestly improved survival, but the effects were not cytotoxic and were reversible. To improve on this approach, we combined in vitro targeting of STAT5-mediated AKT/mTOR using rapamycin with inhibition of the STAT5 direct target genes bcl-2 and bcl-X(L) using ABT-737. Striking synergy with both drugs was observed in mouse BaF3 cells expressing STAT5a(S711F), TEL-JAK2 or BCR-ABL and in the relatively single agent-resistant human BCR-ABL-positive K562 cell line. Therefore, targeting distinct STAT5-mediated survival signals, for example, bcl-2/bcl-X(L) and AKT/mTOR may be an effective therapeutic approach for human myeloproliferative neoplasms.
AuthorsG Li, K L Miskimen, Z Wang, X Y Xie, W Tse, F Gouilleux, R Moriggl, K D Bunting
JournalLeukemia (Leukemia) Vol. 24 Issue 8 Pg. 1397-405 (Aug 2010) ISSN: 1476-5551 [Electronic] England
PMID20535152 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)
Chemical References
  • ABT-737
  • Antibiotics, Antineoplastic
  • Biphenyl Compounds
  • Nitrophenols
  • Piperazines
  • STAT5 Transcription Factor
  • Sulfonamides
  • Sirolimus
Topics
  • Animals
  • Antibiotics, Antineoplastic (administration & dosage, pharmacology)
  • Biphenyl Compounds (administration & dosage, pharmacology)
  • Cell Line, Tumor
  • Cell Survival
  • Flow Cytometry
  • Humans
  • Mice
  • Mice, Inbred C57BL
  • Myeloproliferative Disorders (pathology, physiopathology)
  • Nitrophenols (administration & dosage, pharmacology)
  • Piperazines (administration & dosage, pharmacology)
  • STAT5 Transcription Factor (drug effects, physiology)
  • Sirolimus (administration & dosage, pharmacology)
  • Sulfonamides (administration & dosage, pharmacology)

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: