Dynamics of telomere's length and telomerase activity in Philadelphia chromosome negative myeloproliferative neoplasms.
Telomere exhaustion and increased telomerase activity are associated with the acquisition of aggressive molecular events in a variety of haematological malignancies. In Philadelphia chromosome negative myeloproliferative neoplasms (Ph(neg)MPN's), telomere dynamics during clonal evolution of these diseases have not yet been fully elucidated. Herein we demonstrated that telomere shortening is a global phenomenon in Ph(neg)MPN's, irrespective of disease phenotype, treatment administration and JAK2V617F mutational status but the presence of additional cytogenetic abnormalities further affects them. Consistent with the above finding, TA was upregulated in CD34+ haemopoietic progenitors from almost all Ph(neg)MPN subgroups compared to healthy donors. Moreover, TL below the cut-off value of 27% could predict disease progression in Ph(neg)MPN patients (PFS at 5 years 39% vs 81%). Thus, TL emerges as a new prognostic marker in Ph(neg)MPN, reflecting probably the genetic instability of highly proliferating MPN clones.
Spanoudakis
Emmanouil
E
Department of Haematology, Democritus University of Thrace, Medical School, Alexandroupolis, Greece.
Bazdiara
Ioanna
I
Pantelidou
Despoina
D
Kotsianidis
Ioannis
I
Papadopoulos
Vasilios
V
Margaritis
Dimitrios
D
Xanthopoulidis
George
G
Moustakidis
Eleftherios
E
Mantzourani
Stamatia
S
Bourikas
George
G
Tsatalas
Costas
C
D001854:Bone Marrow Cells / Q000201:enzymology / Q000378:metabolism; D002478:Cells, Cultured; D015870:Gene Expression; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D053614:Janus Kinase 2 / Q000235:genetics; D009154:Mutation; D009196:Myeloproliferative Disorders / Q000188:drug therapy / Q000201:enzymology* / Q000235:genetics*; D010677:Philadelphia Chromosome; D011379:Prognosis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D019098:Telomerase / Q000235:genetics / Q000378:metabolism*; D016615:Telomere / Q000235:genetics*
D053614:Janus Kinase 2; D019098:Telomerase