JAK2 V617F

Expression of the BCR-ABL1 Gene in Patients with Chronic Myeloproliferative Diseases with Signs of Progression

MYELOID TUMORS , , , , ,

LA Kesaeva1, EN Misyurina2, DS Mar’in2, EI Zhelnova2, AYu Bulanov2, AE Misyurina3, AA Krutov4, IN Soldatova4, SS Zborovskii4, VA Misyurin1,4, VV Tikhonova1, YuP Finashutina1, ON Solopova1, NA Lyzhko1, AE Bespalova1, NN Kasatkina1, AV Ponomarev1, MA Lysenko2, AV Misyurin1,4

1 NN Blokhin National Medical Cancer Research Center, 24 Kashirskoye sh., Moscow, Russian Federation, 115478

2 Municipal Clinical Hospital No. 52, 3 Pekhotnaya str., Moscow, Russian Federation, 123182

3 National Research Center for Hematology, 4 Novyi Zykovskii pr-d, Moscow, Russian Federation, 125167

4 GenoTekhnologiya, 104 Profsoyuznaya str., Moscow, Russian Federation, 117485

For correspondence: Andrei Vital’evich Misyurin, PhD in Biology, 24 Kashirskoye sh., Moscow, Russian Federation, 115478; Tel.: +7(499)612-80-38; e-mail: and@genetechnology.ru

For citation: Kesaeva LA, Misyurina EN, Mar’in DS, et al. Expression of the BCR-ABL1 Gene in Patients with Chronic Myeloproliferative Diseases with Signs of Progression. Clinical oncohematology. 2018;11(4):354–9.

DOI: 10.21320/2500-2139-2018-11-4-354-359

ABSTRACT

Background. The V617F mutation of JAK2 is known to manifest in Ph-negative chronic myeloproliferative diseases (cMPD), such as polycythemia vera, thrombocythemia, and myelofibrosis. These diseases not infrequently advance into more aggressive forms up to acute leukemia. As the progression mechanism is still unknown, its study retains a high priority. JAK2 carrying the V617F mutation is believed to cause constant activation of V(D)J recombinase in myeloid tumor cells in cMPD patients. Aberrant activation of V(D)J recombinase in tumor cells in cMPD patients can lead to t(9;22)(q34;q11) chromosomal rearrangement.

Aim. To study the expression of BCR-ABL1 resulting from translocation t(9;22)(q34;q11) in cMPD patients at the progression stage in order to test the suggested hypothesis.

Materials & Methods. The BCR–ABL1 expression was assessed in peripheral blood granulocytes in cMPD patients by real-time PCR. The JAK2 V617F mutation was identified by quantitative allele-specific PCR. The JAK2 exon 12 mutations were determined using Sanger direct sequencing of PCR products.

Results. The BCR-ABL1 expression was discovered in 29 % of patients with cMPD progression. The BCR-ABL1 expression in these patients correlated with hepatosplenomegaly and hyperleukocytosis.

Conclusion. In a significant proportion of cMPD patients the disease progression can be associated with activation of the BCR-ABL expression.

Keywords: JAK2 V617F, BCR-ABL1, V(D)J recombinase, t(9;22)(q34;q11), polycythemia vera, essential thrombocythemia, myelofibrosis, chronic myeloid leukemia.

Received: April 2, 2018

Accepted: August 5, 2018

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Myelofibrosis Models: Literature Review and Own Data

MYELOID TUMORS , , ,

AA Silyutina, II Gin, NM Matyukhina, EN Balayan, PA Butylin

VA Almazov Federal North-West Medical Research Center, 2 Akkuratova str., Saint Petersburg, Russian Federation, 197341

For correspondence: Pavel Andreevich Butylin, PhD, 2 Akkuratova str., Saint Petersburg, Russian Federation, 197341; e-mail: butylinp@gmail.com

For citation: Silyutina AA, Gin II, Matyukhina NM, et al. Myelofibrosis Models: Literature Review and Own Data. Clinical oncohematology. 2017;10(1):75–84 (In Russ).

DOI: 10.21320/2500-2139-2017-10-1-75-84

ABSTRACT

Background & Aims. Chronic myeloproliferative disorders typically develop during a long latent period, and it complicates the study of the mechanism of its pathogenesis. Observations from the clinical practice should be confirmed by experiments. The mechanisms of oncological transformation related to mutations associated with chronic myeloproliferative diseases were confirmed in transgene animal models. Biological models permitted to determine a complex nature of myelofibrosis. However, studies of the cellular mechanisms of myelofibrosis require new models. This paper presents a review of published models of myeloproliferative disorders, mainly, primary myelofibrosis, and results of studies of a new cell line with expression of JAK2 V617F. The aim of this study is to create a new cell line with expression of transforming JAK2 V617F mutation in acute monocytic leukemia THP-1 cells.

Methods. Transgenic cell lines were created on the basis of monocytic leukemia THP-1 cell line that can differentiate into macrophages. Direct mutagenesis was used to cause V617F mutation. Two cell lines were created: one with JAK2 expression with V617F mutation, the other with wild type JAK2.

Results. Both transgenic lines were characterized by increased JAK2 expression as compared to non-modified cells. In routine cultivation, transgenic THP-1 cells retained the morphology of monocytes. After treatment with phorbol ester, THP-1 differentiated into macrophages and become adherent to culture plastic. Adherent cells demonstrated the variety of shapes: some of them were spherical, the other ones had pseudopodia. No significant differences in viability of cells were observed. However, macrophages expressing mutant JAK2 and overexpressing the wild type JAK2 demonstrated a tendency to decreased amount unlivable cells during cultivation.

Conclusion. The obtained cell model can be used for estimating the influence of JAK2 V617F mutation on pro- and antifibrotic potential of macrophages that can help to investigate the pathogenetic role of macrophages in myelofibrosis development. In addition, this model can help to develop novel methods of therapy and diagnostics of primary and secondary myelofibrosis.

Keywords: Ph-negative chronic myeloproliferative disorders, primary myelofibrosis, JAK2 V617F, transgenic animals.

Received: September 15, 2016

Accepted: December 13, 2016

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