Abstract:
:Recently, Dawson et al identified a previously unrecognized nuclear role of JAK2 in the phosphorylation of histone H3 in hematopoietic cell lines. We searched nuclear JAK2 in total bone marrow (BM) cells and in 4 sorted BM cell populations (CD34(+), CD15(+), CD41(+), and CD71(+)) of 10 myeloproliferative neoplasia (MPN) patients with JAK2V617F mutation and 5 patients with wild-type JAK2 MPN. Confocal immunofluorescent images and Western blot analyses of nuclear and cytoplasmic fractions found nuclear JAK2 in CD34(+) cells of 10 of 10 JAK2-mutated patients but not in patients with wild-type JAK2. JAK2 was predominantly in the cytoplasmic fraction of differentiated granulocytic, megakaryocytic, or erythroid cells obtained from all patients. JAK2V617F up-regulates LMO2 in K562 and in JAK2V617F-positive CD34(+) cells. The selective JAK2 inhibitor AG490 normalizes the LMO2 levels in V617F-positive K562 and restores the cyto-plasmic localization of JAK2.
journal_name
Bloodjournal_title
Bloodauthors
Rinaldi CR,Rinaldi P,Alagia A,Gemei M,Esposito N,Formiggini F,Martinelli V,Senyuk V,Nucifora G,Pane Fdoi
10.1182/blood-2010-08-302265subject
Has Abstractpub_date
2010-12-23 00:00:00pages
6023-6issue
26eissn
0006-4971issn
1528-0020pii
blood-2010-08-302265journal_volume
116pub_type
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