Abstract:
:Systemic anaplastic large cell lymphoma is a category of T-cell non-Hodgkin's lymphoma which can be further subdivided into two distinct entities (ALK(+) and ALK(-)) based on the presence or absence of ALK gene rearrangements. Among several pathways triggered by ALK signaling, constitutive activation of STAT3 is strictly required for ALK-mediated transformation and survival. Here we performed genome-wide microRNA profiling and identified 48 microRNA concordantly modulated by the inducible knock-down of ALK and STAT3. To evaluate the functional role of differentially expressed miRNA, we forced their expression in ALK(+) anaplastic large cell lymphoma cells, and monitored their influence after STAT3 depletion. We found that the expression of the microRNA-17~92 cluster partially rescues STAT3 knock-down by sustaining proliferation and survival of ALK(+) cells. Experiments in a xenograft mouse model indicated that forced expression of microRNA-17~92 interferes with STAT3 knock-down in vivo. High expression levels of the microRNA-17~92 cluster resulted in down-regulation of BIM and TGFβRII proteins, suggesting that their targeting might mediate resistance to STAT3 knock-down in anaplastic large cell lymphoma cells. We speculate that the microRNA-17~92 cluster is involved in lymphomagenesis of STAT3(+) ALCL and that its inhibition might represent an alternative avenue to interfere with ALK signaling in anaplastic large cell lymphomas.
journal_name
Haematologicajournal_title
Haematologicaauthors
Spaccarotella E,Pellegrino E,Ferracin M,Ferreri C,Cuccuru G,Liu C,Iqbal J,Cantarella D,Taulli R,Provero P,Di Cunto F,Medico E,Negrini M,Chan WC,Inghirami G,Piva Rdoi
10.3324/haematol.2013.088286subject
Has Abstractpub_date
2014-01-01 00:00:00pages
116-24issue
1eissn
0390-6078issn
1592-8721pii
haematol.2013.088286journal_volume
99pub_type
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