Acute myeloid leukaemia (AML) is the leading form of fatal acute leukaemia in adults. AML is a heterogeneous disease with respect to responsible mutations and chromosomal abnormalities as well as to their clinicopathological image. In recent years, great progress has been made in techniques allowing detection of genetic changes in both de novo AML and in secondary AML induced by other haematological disorders or therapy, and in detection of residual disease after therapy. Accumulated knowledge allowed better understanding of the molecules and mechanisms involved not only in the formation and expansion of a primary leukaemia-founding clone, but also of a temporal order of changes leading to the fully malignant phenotype. The recent knowledge of bone marrow (BM) compartments and interrelations among various BM resident and recruited cell types helps in understanding the AML development. The progress in the techniques and knowledge will result in the development and use of molecularly targeted therapies tailored to individual patient needs.

• MeSH
• akutní myeloidní leukemie genetika   metabolismus   MeSH
• chromozomální aberace MeSH
• fenotyp MeSH
• kostní dřeň metabolismus   MeSH
• lidé MeSH
• mutace genetika   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

Myeloblastosis-associated virus 2 (MAV-2) is a highly tumorigenic simple avian retrovirus. Chickens infected in ovo with MAV-2 develop tumors in the kidneys, lungs, and liver with a short latency, less than 8 weeks. Here we report the results of molecular analyses of MAV-2-induced liver tumors that fall into three classes: hepatic hemangiosarcomas (HHSs), intrahepatic cholangiocarcinomas (ICCs), and hepatocellular carcinomas (HCCs). Comprehensive inverse PCR-based screening of 92 chicken liver tumors revealed that in ca. 86% of these tumors, MAV-2 provirus had integrated into one of four gene loci: HRAS, EGFR, MET, and RON Insertionally mutated genes correlated with tumor type: HRAS was hit in HHSs, MET in ICCs, RON mostly in ICCs, and EGFR mostly in HCCs. The provirus insertions led to the overexpression of the affected genes and, in the case of EGFR and RON, also to the truncation of exons encoding the extracellular ligand-binding domains of these transmembrane receptors. The structures of truncated EGFR and RON closely mimic the structures of oncogenic variants of these genes frequently found in human tumors (EGFRvIII and sfRON).IMPORTANCE These data describe the mechanisms of oncogenesis induced in chickens by the MAV-2 retrovirus. They also show that molecular processes converting cellular regulatory genes to cancer genes may be remarkably similar in chickens and humans. We suggest that the MAV-2 retrovirus-based model can complement experiments performed using mouse models and provide data that could translate to human medicine.

• MeSH
• cholangiokarcinom genetika   virologie   MeSH
• geny erbB-1 * MeSH
• hemangiosarkom genetika   virologie   MeSH
• hepatocelulární karcinom genetika   virologie   MeSH
• integrace viru MeSH
• inzerční mutageneze * MeSH
• karcinogeneze * MeSH
• kur domácí genetika   MeSH
• lidé MeSH
• nádory jater genetika   virologie   MeSH
• onkogeny MeSH
• protoonkogenní proteiny c-met genetika   MeSH
• proviry genetika   fyziologie   MeSH
• ptačí proteiny genetika   MeSH
• tyrosinkinasové receptory genetika   MeSH
• virus ptačí myeloblastózy genetika   fyziologie   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

Dietary phospholipids (PLs) and their derivatives have proved active in suppression of various health problems and conditions including cancer. In this work we compared the effect of dietary phospholipids from hen egg yolk enriched with N-acyl ether-phosphatidyl ethanolamine (NAEPE) termed bioactive phospholipids (BAP+ preparation) with PLs lacking NAEPE (BAP- preparation) on the growth of transformed cells in vitro and on the promotion and progression of experimental tumours in vivo. For the in vivo experiments we used the chicken model in which liver, lung, and kidney tumours arose via natural selection from single cells initiated by experimentally introduced somatic mutations caused by insertional mutagenesis. Mutagenized animals were fed BAP+ or BAP- diet in various regimens. We observed that BAP+ at low concentrations killed cells of various tumour cell lines in culture but did not compromise viability of non-transformed cells. Oral administration of the BAP+ preparation efficiently reduced progression of all tumour types. However, it did not significantly reduce the number of already initiated tumours and their growth when BAP+ was discontinued. Our data suggest that NAEPE combined with hen egg PLs significantly interferes with tumour progression, possibly through the inhibition of tumour cell viability.

• MeSH
• aplikace orální MeSH
• ethanolaminy chemie   farmakologie   MeSH
• fosfolipidy aplikace a dávkování   chemie   farmakologie   MeSH
• kultivované buňky MeSH
• kuřecí embryo MeSH
• modely nemocí na zvířatech MeSH
• nádorové buněčné linie MeSH
• nádory farmakoterapie   patofyziologie   MeSH
• proliferace buněk účinky léků   MeSH
• vaječný žloutek chemie   MeSH
• viabilita buněk účinky léků   MeSH
• zvířata MeSH
• Check Tag
• kuřecí embryo MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

The neural crest (NC) is a transient dynamic structure of ectodermal origin, found in early vertebrate embryos. The multipotential NC cells migrate along well defined routes, differentiate to various cell types including melanocytes and participate in the formation of various permanent tissues. As there is only limited information about the molecular mechanisms controlling early events in melanocyte specification and development, we exploited the AMV v-Myb transcriptional regulator, which directs differentiation of in vitro chicken NC cells to the melanocyte lineage. This activity is strictly dependent on v-Myb specifically binding to the Myb recognition DNA element (MRE). The two tamoxifen-inducible v-Myb alleles were constructed one which recognizes the MRE and one which does not. These were activated in ex ovo NC cells, and the expression profiles of resulting cells were analyzed using Affymetrix microarrays and RT-PCR. These approaches revealed up-regulation of the BMP antagonist Gremlin 2 mRNA, and down-regulation of mRNAs encoding several epithelial genes including KRT19 as very early events following the activation of melanocyte differentiation by v-Myb. The enforced v-Myb expression in neural tubes of chicken embryos resulted in detectable presence of Gremlin 2 mRNA. However, expression of Gremlin 2 in NC cells did not promote formation of melanocytes suggesting that Gremlin 2 is not the master regulator of melanocytic differentiation.

• MeSH
• aktivace transkripce * MeSH
• alely MeSH
• buněčná diferenciace * MeSH
• crista neuralis cytologie   MeSH
• keratin-19 genetika   metabolismus   MeSH
• kostní morfogenetický protein 5 genetika   metabolismus   MeSH
• kultivované buňky MeSH
• kuřecí embryo MeSH
• melanocyty fyziologie   MeSH
• mezibuněčné signální peptidy a proteiny genetika   metabolismus   MeSH
• onkogenní proteiny v-myb fyziologie   MeSH
• ptačí proteiny genetika   metabolismus   MeSH
• regulace genové exprese MeSH
• sekvenční analýza hybridizací s uspořádaným souborem oligonukleotidů MeSH
• transkriptom MeSH
• zvířata MeSH
• Check Tag
• kuřecí embryo MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

Fibrotic diseases are a group of pathologies with high incidence and mortality. Despite extensive research efforts, effective therapies are still not available. Understanding the molecular mechanisms driving the onset, progression and possible resolution of fibrosis is a prerequisite to the development of successful therapies. The central role of the TGF-β pathway and myofibroblasts in the pathogenesis of fibrosis is now generally accepted. The possible mechanisms of myofibroblast elimination or dedifferentiation, on the other hand, are still almost uncharted territory. Here we show that sustained expression of some components of MAPK signaling pathway (PDGFB, Ha-Ras(G12V) or the transcription factor EGR4) in primary chicken embryo dermal myofibroblasts results in a loss of autocrine TGF-β signaling and suppression of the myofibroblastic phenotype, characterized by the loss of alpha smooth muscle actin fibers and a substantial reduction in the production of extracellular matrix. Detailed analysis of the possible molecular mechanisms employed by EGR4 revealed FOXG1, BAMBI, NAB1, NAB2 and DUSP5 genes forming an EGR4 regulated network counteracting autocrine TGF-β signaling. We have also found that a combination of chemical inhibition of TGF-β signaling and perturbation of MAPK signaling with phorbol ester mimics the anti-fibrotic effects of PDGFB, Ha-Ras(G12V) and EGR4.

• MeSH
• aktiny genetika   metabolismus   MeSH
• dediferenciace buněk * MeSH
• forbolové estery farmakologie   MeSH
• kuřecí embryo MeSH
• mitogenem aktivované proteinkinasy metabolismus   MeSH
• myofibroblasty cytologie   metabolismus   MeSH
• signální transdukce MeSH
• transformující růstový faktor beta metabolismus   MeSH
• zvířata MeSH
• Check Tag
• kuřecí embryo MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

The myofibroblast is a mesenchymal cell characterized by synthesis of the extracellular matrix, plus contractile and secretory activities. Myofibroblasts participate in physiological tissue repair, but can also cause devastating fibrosis. They are present in the tumor stroma of carcinomas and contribute to tumor growth and spreading. As myofibroblasts derive from various cell types and appear in a variety of tissues, there is marked variability in their phenotype. As regulatory mechanisms of wound healing are likely conserved among vertebrates, detailed knowledge of these mechanisms in more distant species will help to distinguish general from specific phenomena. To provide this as yet missing comparison, we analyzed the impact of the chemical inhibition of TGF-beta signaling on gene expression in chicken embryo dermal myofibroblasts. We revealed genes previously reported in mammalian systems (e.g. SPON2, ASPN, COMP, LUM, HAS2, IL6, CXCL12, VEGFA) as well as novel TGF-beta dependent genes, among them PGF, VEGFC, PTN, FAM180A, FIBIN, ZIC1, ADCY2, RET, HHIP and DNER. Inhibition of TGF-beta signaling also induced multiple genes, including NPR3, AGTR2, MTUS1, SOD3 and NOV. We also analyzed the effects of long term inhibition, and found that it is not able to induce myofibroblast dedifferentiation.

• MeSH
• kultivované buňky MeSH
• kur domácí genetika   MeSH
• kuřecí embryo MeSH
• myofibroblasty účinky léků   fyziologie   MeSH
• protein-serin-threoninkinasy antagonisté a inhibitory   MeSH
• receptory transformujícího růstového faktoru beta antagonisté a inhibitory   MeSH
• signální transdukce účinky léků   MeSH
• škára účinky léků   embryologie   MeSH
• transformující růstový faktor beta antagonisté a inhibitory   metabolismus   MeSH
• vývojová regulace genové exprese * MeSH
• zvířata MeSH
• Check Tag
• kuřecí embryo MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

BACKGROUND: Although there is extensive evidence for the amoeboid invasiveness of cancer cells in vitro, much less is known about the role of amoeboid invasiveness in metastasis and the importance of Rho/ROCK/MLC signaling in this process. RESULTS: We analyzed the dependence of amoeboid invasiveness of rat and chicken sarcoma cells and the metastatic activity of chicken cells on individual elements of the Rho/ROCK/MLC pathway. In both animal models, inhibition of Rho, ROCK or MLC resulted in greatly decreased cell invasiveness in vitro, while inhibition of extracellular proteases using a broad spectrum inhibitor did not have a significant effect. The inhibition of both Rho activity and MLC phosphorylation by dominant negative mutants led to a decreased capability of chicken sarcoma cells to metastasize. Moreover, the overexpression of RhoA in non-metastatic chicken cells resulted in the rescue of both invasiveness and metastatic capability. Rho and ROCK, unlike MLC, appeared to be directly involved in the maintenance of the amoeboid phenotype, as their inhibition resulted in the amoeboid-mesenchymal transition in analyzed cell lines. CONCLUSION: Taken together, these results suggest that protease-independent invasion controlled by elements of the Rho/ROCK/MLC pathway can be frequently exploited by metastatic sarcoma cells.

• MeSH
• invazivní růst nádoru MeSH
• kinázy asociované s rho metabolismus   MeSH
• krysa rodu rattus MeSH
• kur domácí MeSH
• lehké řetězce myosinu metabolismus   MeSH
• nádorové buněčné linie MeSH
• pohyb buněk MeSH
• rho proteiny vázající GTP metabolismus   MeSH
• sarkom metabolismus   patologie   MeSH
• signální transdukce MeSH
• zvířata MeSH
• Check Tag
• krysa rodu rattus MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

Kazuistika pojednává o třicetileté pacientce, která byla opakovaně hospitalizována pro levostrannou ileofemorální trombózu. Pacientka byla indikována k lokální farmakologické trombolýze. V průběhu trombolýzy bylo však vyjádřeno podezření na možnost komprese cév zvenčí. Následovala další vyšetření, která odhalila měkkotkáňovou nebolestivou formaci na mediální straně stehna jako příčinu na léčbu rezistentní trombózy. Rezistence se nacházela v těsném kontaktu s nervově-cévním svazkem na stehně. Dle histologie se jednalo o bifázický synoviální sarkom. V době diagnózy byly již přítomny vzdálené plicní metastázy I přes intenzivní neoadjuvantní léčbu dochází k progresi zejména plicního postižení. Chirurgická léčba není toho času indikována. Pacientka umírá 6 měsíců od stanovení diagnózy.

Case report deals with a 30-year-old female patient, who was repeatedly admitted to hospital with left sided ileofemoral thrombosis. The patient was scheduled to local farmacological thrombolysis. During the thrombolysis a suspicion of compression of the vessels from outside was expressed. A further examination revealed an extensive soft-tissue non-painful mass on the medial side of the thigh as a cause of the thrombosis, which was not responding to the treatment. The lesion was in close contact with the femoral neurovascular bundle. The histological examination proved biphasic synovial sarcoma. At the time of diagnosis, distant lung metastases were already present. Despite intensive neoadjuvant therapy the disease, especially the lung affection progressed. The patient died six months after the detection of the diagnosis.

• Klíčová slova
• expanze,
• MeSH
• diagnostické zobrazování využití   MeSH
• dospělí MeSH
• fatální výsledek MeSH
• komplikace těhotenství diagnóza   etiologie   terapie   MeSH
• lidé MeSH
• prognóza MeSH
• progrese nemoci MeSH
• sarkom diagnóza   etiologie   terapie   MeSH
• synoviom * diagnóza   etiologie   terapie   MeSH
• žilní trombóza * etiologie   terapie   MeSH
• Check Tag
• dospělí MeSH
• lidé MeSH
• ženské pohlaví MeSH
• Publikační typ
• kazuistiky MeSH

• Publikační typ
• abstrakty MeSH

Metastatic spreading of cancer cells is a highly complex process directed primarily by the interplay between tumor microenvironment, cell surface receptors, and actin cytoskeleton dynamics. To advance our understanding of metastatic cancer dissemination, we have developed a model system that is based on two v-src transformed chicken sarcoma cell lines-the highly metastatic parental PR9692 and a non-metastasizing but fully tumorigenic clonal derivative PR9692-E9. Oligonucleotide microarray analysis of both cell lines revealed that the gene encoding the transcription factor EGR1 was downregulated in the non-metastatic PR9692-E9 cells. Further investigation demonstrated that the introduction of exogenous EGR1 into PR9692-E9 cells restored their metastatic potential to a level indistinguishable from parental PR9692 cells. Microarray analysis of EGR1 reconstituted cells revealed the activation of genes that are crucial for actin cytoskeleton contractility (MYL9), filopodia formation (MYO10), the production of specific extracellular matrix components (HAS2, COL6A1-3) and other essential pro-metastatic abilities.

• MeSH
• buněčná adheze MeSH
• buněčné linie MeSH
• cytoskelet metabolismus   MeSH
• fenotyp MeSH
• kinetika MeSH
• kur domácí MeSH
• metastázy nádorů genetika   MeSH
• nádorová transformace buněk genetika   patologie   MeSH
• onkogenní protein pp60(v-src) genetika   metabolismus   MeSH
• pohyb buněk MeSH
• proliferace buněk MeSH
• protein 1 časné růstové odpovědi genetika   metabolismus   MeSH
• regulace genové exprese u nádorů MeSH
• sarkom genetika   patologie   MeSH
• stanovení celkové genové exprese MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH