Published in:
01-07-2015 | Research
Expression of Certain Leukemia/Lymphoma Related microRNAs and its Correlation with Prognosis in Childhood Acute Lymphoblastic Leukemia
Authors:
Karolina Nemes, Monika Csóka, Noémi Nagy, Ágnes Márk, Zsófia Váradi, Titanilla Dankó, Gábor Kovács, László Kopper, Anna Sebestyén
Published in:
Pathology & Oncology Research
|
Issue 3/2015
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Abstract
In spite of the improved efficacy of therapy, it still fails in 15–20 % of childhood acute lymphoblastic leukemia (ALL) patients. Recently, altered expression of certain miRNAs (miRs) have been described in ALL with potential effect on prognosis. Presence of certain miRs (miRNA-16, −21, −24, −29b, −128b, −142-3p, −155, −223) was characterized in human lymphoma and leukemia cells by real-time PCR. Expression of miRs in pediatric ALL patients (n = 24) was measured before chemotherapy, at conventional response checkpoints and at relapse. Correlation between altered miR expression and response to prednisolone at day 8 of therapy and long term prognosis was statistically analysed. Overexpression of “oncomiR/inflammamiR”-21 – which is characteristic in different tumors—was missing in human ALL cells. However, higher expression of miR-128b and lower expression of miR-223 is generally characteristic for human ALL cell lines and ALL cells isolated from pediatric patients. Correlation was shown between miR-128b expression and prognosis, prednisolone response and survival data in childhood ALL. Expression of miR-128b and miR-223—both are leukemia specific—changed in parallel with percentage of bone marrow blasts in remission and during relapse. Therefore, we suggest that overexpression of miR-128b and downregulation of miR-223 shows a significant correlation with treatment response and prognosis in childhood ALL.