Lymphoma with secondary central nervous system (CNS) involvement represents one of the most aggressive malignancies, with poor prognosis and high mortality. New diagnostic tools for its early detection, response evaluation, and CNS relapse prediction are needed. We analyzed circulating microRNAs in the cerebrospinal fluid (CSF) and plasma of 162 patients with aggressive B-cell non-Hodgkin's lymphomas (B-NHL) and compared their levels in CNS-involving lymphomas versus in systemic lymphomas, at diagnosis and during treatment and CNS relapse. We identified a set of five oncogenic microRNAs (miR-19a, miR-20a, miR-21, miR-92a, and miR-155) in CSF that detect, with high sensitivity, secondary CNS lymphoma involvement in aggressive B-NHL, including DLBCL, MCL, and Burkitt lymphoma. Their combination into an oncomiR index enables the separation of CNS lymphomas from systemic lymphomas or nonmalignant controls with high sensitivity and specificity, and high Receiver Operating Characteristics (DLBCL AUC = 0.96, MCL = 0.93, BL = 1.0). Longitudinal analysis showed that oncomiR levels reflect treatment efficacy and clinical outcomes, allowing their monitoring and prediction. In contrast to conventional methods, CSF oncomiRs enable detection of early and residual CNS involvement, as well as parenchymal involvement. These circulating oncomiRs increase 1-4 months before CNS relapse, allowing its early detection and improving the prediction of CNS relapse risk in DLBCL. Similar effects were detectable, to a lesser extent, in plasma.
- Publikační typ
- časopisecké články MeSH
Erythropoietin (EPO) downregulates hepcidin expression to increase the availability of iron; the downregulation of hepcidin is mediated by erythroferrone (ERFE) secreted by erythroblasts. Erythroblasts also express transferrin receptor 2 (TFR2); however, the possible role of TFR2 in hepcidin downregulation is unclear. The purpose of the study was to correlate liver expression of hepcidin with the expression of ERFE and TFR2 in murine bone marrow and spleen at 4, 16, 24, 48, 72 and 96 h following administration of a single dose of EPO. Splenic Fam132b expression increased 4 h after EPO injection; liver hepcidin mRNA was decreased at 16 h. In the spleen, expression of TFR2 and transferrin receptor (TFR1) proteins increased by an order of magnitude at 48 and 72 h after EPO treatment. The EPO-induced increase in splenic TFR2 and TFR1 was associated with an increase in the number of Tfr2- and Tfr1-expressing erythroblasts. Plasma exosomes prepared from EPO-treated mice displayed increased amount of TFR1 protein; however, no exosomal TFR2 was detected. Overall, the results confirm the importance of ERFE in stress erythropoiesis, support the role of TFR2 in erythroid cell development, and highlight possible differences in the removal of TFR2 and TFR1 from erythroid cell membranes.
- MeSH
- cytokiny genetika metabolismus MeSH
- erythropoetin farmakologie MeSH
- erytroblasty účinky léků metabolismus MeSH
- exozómy metabolismus MeSH
- hepcidiny genetika metabolismus MeSH
- játra metabolismus MeSH
- kultivované buňky MeSH
- myši inbrední C57BL MeSH
- myši MeSH
- receptory transferinu genetika metabolismus MeSH
- slezina metabolismus MeSH
- svalové proteiny genetika metabolismus MeSH
- zvířata MeSH
- Check Tag
- mužské pohlaví MeSH
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
Závěrečná zpráva o řešení grantu Agentury pro zdravotnický výzkum MZ ČR
Nestr.
Lymphoma involving CNS represents one of the most aggressive malignancies with poor prognosis and high mortality. Currently, their diagnosis suffers from low sensitivity and specificity. More powerful tools for early detection, response evaluation and CNS relapse risk prediction are urgently needed. Lymphomas overexpress short oncogenic regulatory RNAs called microRNAs that influence tumor growth and spreading. Unlike longer species, microRNAs are surprisingly stable and detectable in body fluids including cerebrospinal fluid (CSF). Proposed aim is to develop a method for sensitive and early detection and monitoring of CNS lymphoma, based on measurement of extracellular microRNAs in CSF and plasma that can serve as criteria for more effective early treatment or CNS prophylaxis. Our preliminary data indicate that we identified specific set of oncogenic microRNAs that can with high sensitivity and several months in advance identify CNS lymphoma involvement, reflects therapy efficiency or predict progression or relapse, thus substituting the weakness of current diagnostic methods.
Lymfomy centrální nervové soustavy (CNS) představují jednu z nejagresivnějších malignit, vyznačující se špatnou prognózou a krátkou dobou přežití. Jejich současná diagnóza je založena na metodách s nízkou citlivostí a specifičností, schopných zachytit až již rozvinutý a hůře léčitelný lymfom. MikroRNA jsou krátké nekódující, nádorově specifické RNA, regulující genovou expresi na post-transkripční úrovni, jejichž specifickou vlastností je vysoká stabilita v tělních tekutinách. Cílem návrhu je vyvinout metodu pro včasnou a citlivou detekci lymfomů CNS na základě měření extracelulární mikroRNA v mozkomíšním moku a plazmě, která by umožnila včasnou a tím efektivnější léčbu nebo CNS profylaxi. V laboratoři 1.LF UK jsme vyvinuli metodu stanovení mikroRNA v mozkomíšním moku a předběžné výsledky ukazují, že jsme identifikovali index specifických nádorových mikroRNA, schopný s vysokou senzitivitou a s několikaměsíčním předstihem detekovat lymfomové postižení CNS, předpovědět jeho progresi či relaps a odrážející účinnost léčby; nahrazující tak nedostatky současných diagnostických metod. ...
- MeSH
- časná detekce nádoru MeSH
- exprese genu MeSH
- krevní plazma MeSH
- lidé MeSH
- lymfom diagnóza genetika MeSH
- mikro RNA krev mozkomíšní mok MeSH
- mozkomíšní mok MeSH
- nemoci centrálního nervového systému diagnóza genetika MeSH
- recidiva MeSH
- Check Tag
- lidé MeSH
- Konspekt
- Patologie. Klinická medicína
- NLK Obory
- onkologie
- genetika, lékařská genetika
- neurologie
- NLK Publikační typ
- závěrečné zprávy o řešení grantu AZV MZ ČR
- MeSH
- chronická lymfatická leukemie * diagnóza genetika patologie MeSH
- lidé MeSH
- lymfom z plášťových buněk * diagnóza genetika patologie MeSH
- mikro RNA MeSH
- nádorová transformace buněk MeSH
- nádorové biomarkery analýza MeSH
- stanovení celkové genové exprese MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- práce podpořená grantem MeSH
BACKGROUND: MicroRNAs (miRs) represent a distinct class of posttranscriptional modulators of gene expression with remarkable stability in sera. Several miRs are oncogenic (oncomiRs) and are deregulated in the pathogenesis of breast cancer and function to inhibit tumor suppressors. Routine blood monitoring of these circulating tumor-derived products could be of significant benefit to the diagnosis and relapse detection of early-stage breast cancer (EBC) patients. METHODS: Aim of this project was to determine expression of miR-155, miR-19a, miR-181b, miR-24, relative to let-7a in sera of 63 patients with EBC and 21 healthy controls. Longitudinal multivariate data analysis was performed to stochastically model the serum levels of each of the oncomiRs during disease phases: from diagnosis, after surgery, and following chemo/radiotherapy. Moreover, this analysis was utilized to evaluate oncomiR levels in EBC patients subgrouped using current clinical prognostic factors including HER2, Ki-67, and grade III. RESULTS: EBC patients significantly over-express the oncomiRs at the time of diagnosis. Following surgical resection the serum levels of miR-155, miR-181b, and miR-24 significantly decreased (p = 1.89e-05, 5.41e-06, and 0.00638, respectively) whereas the miR-19a decreased significantly after the therapy (p = 0.00869). Furthermore, in case of high-risk patients serum levels of miR-155, miR-19a, miR-181b, and miR-24 are significantly more abundant in comparison to low-risk group (p = 0.026, 0.02567, 0.0250, and 0.00990) and show a decreasing trend upon therapy. CONCLUSIONS: OncomiRs are significantly more abundant in the sera of EBC patients compared to controls at diagnosis. Differences in oncomiR levels reflecting EBC risk were also observed. Testing the oncomiRs may be useful for diagnostic purpose and possibly also for relapse detection in follow-up studies of EBC.
- MeSH
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mikro RNA krev genetika MeSH
- nádorové biomarkery krev genetika MeSH
- nádory prsu diagnóza genetika terapie MeSH
- prognóza MeSH
- senioři MeSH
- studie případů a kontrol MeSH
- stupeň nádoru MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- MeSH
- azacytidin aplikace a dávkování farmakologie MeSH
- chromatin genetika MeSH
- lidé MeSH
- metylace DNA genetika účinky léků MeSH
- myelodysplastické syndromy farmakoterapie genetika MeSH
- regulace genové exprese genetika účinky léků MeSH
- vztah mezi dávkou a účinkem léčiva MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- novinové články MeSH
Epigenetic 5-azacitidine (AZA) therapy of high-risk myelodysplastic syndromes (MDS) and acute myelogenous leukemia (AML) represents a promising, albeit not fully understood, approach. Hematopoietic transcription factor PU.1 is dynamically regulated by upstream regulatory element (URE), whose deletion causes downregulation of PU.1 leading to AML in mouse. In this study a significant group of the high-risk MDS patients, as well as MDS cell lines, displayed downregulation of PU.1 expression within CD34+ cells, which was associated with DNA methylation of the URE. AZA treatment in vitro significantly demethylated URE, leading to upregulation of PU.1 followed by derepression of its transcriptional targets and onset of myeloid differentiation. Addition of colony-stimulating factors (CSFs; granulocyte-CSF, granulocyte-macrophage-CSF and macrophage-CSF) modulated AZA-mediated effects on reprogramming of histone modifications at the URE and cell differentiation outcome. Our data collectively support the importance of modifying the URE chromatin structure as a regulatory mechanism of AZA-mediated activation of PU.1 and induction of the myeloid program in MDS.
- MeSH
- aktivace transkripce účinky léků MeSH
- antimetabolity antitumorózní farmakologie terapeutické užití MeSH
- azacytidin farmakologie terapeutické užití MeSH
- buněčná diferenciace účinky léků genetika MeSH
- chromatin genetika MeSH
- faktory stimulující kolonie farmakologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- metylace DNA účinky léků MeSH
- myelodysplastické syndromy farmakoterapie genetika MeSH
- nádorové buněčné linie MeSH
- nádorové kmenové buňky cytologie účinky léků metabolismus MeSH
- protoonkogenní proteiny genetika metabolismus MeSH
- regulace genové exprese u leukemie účinky léků MeSH
- regulační oblasti nukleových kyselin účinky léků MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- trans-aktivátory genetika metabolismus MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
The oncogenic cluster miR-17-92 encodes seven related microRNAs that regulate cell proliferation, apoptosis and development. Expression of miR-17-92 cluster is decreased upon cell differentiation. Here, we report a novel mechanism of the regulation of miR-17-92 cluster. Using transgenic PU.1(-/-) myeloid progenitors we show that upon macrophage differentiation, the transcription factor PU.1 induces the secondary determinant Egr2 which, in turn, directly represses miR-17-92 expression by recruiting histone demethylase Jarid1b leading to histone H3 lysine K4 demethylation within the CpG island at the miR-17-92 promoter. Conversely, Egr2 itself is targeted by miR-17-92, indicating existence of mutual regulatory relationship between miR-17-92 and Egr2. Furthermore, restoring EGR2 levels in primary acute myeloid leukaemia blasts expressing elevated levels of miR-17-92 and low levels of PU.1 and EGR2 leads to downregulation of miR-17-92 and restored expression of its targets p21CIP1 and BIM. We propose that upon macrophage differentiation PU.1 represses the miR-17-92 cluster promoter by an Egr-2/Jarid1b-mediated H3K4 demethylation mechanism whose deregulation may contribute to leukaemic states.
- MeSH
- biologické modely MeSH
- buněčná diferenciace genetika MeSH
- buňky NIH 3T3 MeSH
- epigeneze genetická fyziologie MeSH
- HL-60 buňky MeSH
- jaderné proteiny metabolismus fyziologie MeSH
- Jumonjiho doména s histondemethylasami metabolismus fyziologie MeSH
- kultivované buňky MeSH
- lidé MeSH
- makrofágy metabolismus fyziologie MeSH
- mikro RNA genetika metabolismus MeSH
- multigenová rodina genetika MeSH
- myši MeSH
- protein 2 časné růstové odpovědi metabolismus fyziologie MeSH
- protoonkogenní proteiny genetika metabolismus fyziologie MeSH
- represorové proteiny metabolismus fyziologie MeSH
- sekvence nukleotidů MeSH
- sekvenční homologie nukleových kyselin MeSH
- technika přenosu genů MeSH
- trans-aktivátory genetika metabolismus fyziologie MeSH
- transfekce MeSH
- umlčování genů fyziologie MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Research Support, N.I.H., Extramural MeSH