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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The U2AF homology motif kinase 1 (UHMK1) is upregulated upon hematopoietic cell differentiation

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Barbutti, Isabella [1] ; Machado-Neto, Joao Agostinho [2] ; Arfelli, Vanessa Cristina [3] ; Campos, Paula de Melo [1] ; Traina, Fabiola [2] ; Olalla Saad, Sara Teresinha [1] ; Archangelo, Leticia Frohlich [1, 3]
Total Authors: 7
[1] State Univ Campinas UNICAMP, Hematol & Transfus Med Ctr, Carlos Chagas 480, BR-13083878 Campinas, SP - Brazil
[2] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Internal Med, Ribeirao Preto, SP - Brazil
[3] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Cellular & Mol Biol & Pathogen Bioagents, Av Bandeirantes 3900, BR-14049900 Ribeirao Preto, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Web of Science Citations: 1

UHMK1 (KIS) is a nuclear serine/threonine kinase that possesses a U2AF homology motif and phosphorylates and regulates the activity of the splicing factors SF1 and SF3b155. Mutations in these components of the spliceosome machinery have been recently implicated in leukemogenesis. The fact that UHMK1 regulates these factors suggests that UHMK1 might be involved in RNA processing and perhaps leukemogenesis. Here we analyzed UHMK1 expression in normal hematopoietic and leukemic cells as well as its function in leukemia cell line. In the normal hematopoietic compartment, markedly higher levels of transcripts were observed in differentiated lymphocytes (CD4(+), CD8(+) and CD19(+)) compared to the progenitor enriched subpopulation (CD34(+)) or leukemia cell lines. UHMK1 expression was upregulated in megakaryocytic-, monocytic- and granulocytic induced differentiation of established leukemia cell lines and in erythrocytic-induced differentiation of CD34(+) cells. No aberrant expression was observed in patient samples of myelodysplastic syndrome (MDS), acute myeloid (AML) or lymphoblastic (ALL) leukemia. Nonetheless, in MDS patients, increased levels of UHMK1 expression positively impacted event free and overall survival. Lentivirus mediated UHMK1 knockdown did not affect proliferation, cell cycle progression, apoptosis or migration of U937 leukemia cells, although UHMK1 silencing strikingly increased clonogenicity of these cells. Thus, our results suggest that UHMK1 plays a role in hematopoietic cell differentiation and suppression of autonomous clonal growth of leukemia cells. (AU)

FAPESP's process: 14/01458-3 - Defining the functional role of the splicing factor regulator (KIS) during leukemogenesis using a murine bone marrow transplantion model
Grantee:Leticia Fröhlich Archangelo
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 11/51959-0 - Biology of neoplastic diseases of bone marrow
Grantee:Sara Teresinha Olalla Saad
Support type: Research Projects - Thematic Grants