Abstract:
:MCL-1 is a Bcl-2 family member that has been described as antiapoptotic in various myeloid neoplasms. Therefore, MCL-1 has been suggested as a potential new therapeutic target. Systemic mastocytosis (SM) is a myeloid neoplasm involving mast cells (MCs) and their progenitors. In the present study, we examined the expression and functional role of MCL-1 in neoplastic MCs and sought to determine whether MCL-1 could serve as a target in SM. As assessed by RT-PCR and immunohistochemical examination, primary neoplastic MCs expressed MCL-1 mRNA and the MCL-1 protein in all SM patients examined. Moreover, MCL-1 was detectable in both subclones of the MC line HMC-1--HMC-1.1 cells, which lack the SM-related KIT mutation D816V, and HMC-1.2 cells, which carry KIT D816V. Exposure of HMC-1.1 cells or HMC-1.2 cells to MCL-1-specific antisense oligonucleotides (ASOs) or MCL-1-specific siRNA resulted in reduced survival and increased apoptosis compared with untreated cells. Moreover, MCL-1 ASOs were found to cooperate with various tyrosine kinase inhibitors in producing growth inhibition in neoplastic MCs, with synergistic effects observed with PKC412, AMN107, and imatinib in HMC-1.1 cells and with PKC412 in HMC-1.2 cells. Together, these data show that MCL-1 is a novel survival factor and an attractive target in neoplastic MCs.
journal_name
Bloodjournal_title
Bloodauthors
Aichberger KJ,Mayerhofer M,Gleixner KV,Krauth MT,Gruze A,Pickl WF,Wacheck V,Selzer E,Müllauer L,Agis H,Sillaber C,Valent Pdoi
10.1182/blood-2006-07-032714subject
Has Abstractpub_date
2007-04-01 00:00:00pages
3031-41issue
7eissn
0006-4971issn
1528-0020pii
blood-2006-07-032714journal_volume
109pub_type
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