Pediatric central nervous system (CNS) tumors represent the most common cause of cancer-related death in children aged 0-14 years. They differ from their adult counterparts, showing extensive clinical and molecular heterogeneity as well as a challenging histopathological spectrum that often impairs accurate diagnosis. Here, we use DNA methylation-based CNS tumor classification in combination with copy number, RNA-seq, and ChIP-seq analysis to characterize a newly identified CNS tumor type. In addition, we report histology, patient characteristics, and survival data in this tumor type. We describe a biologically distinct pediatric CNS tumor type (n = 31 cases) that is characterized by focal high-level amplification and resultant overexpression of either PLAGL1 or PLAGL2, and an absence of recurrent genetic alterations characteristic of other pediatric CNS tumor types. Both genes act as transcription factors for a regulatory subset of imprinted genes (IGs), components of the Wnt/β-Catenin pathway, and the potential drug targets RET and CYP2W1, which are also specifically overexpressed in this tumor type. A derived PLAGL-specific gene expression signature indicates dysregulation of imprinting control and differentiation/development. These tumors occurred throughout the neuroaxis including the cerebral hemispheres, cerebellum, and brainstem, and were predominantly composed of primitive embryonal-like cells lacking robust expression of markers of glial or neuronal differentiation (e.g., GFAP, OLIG2, and synaptophysin). Tumors with PLAGL1 amplification were typically diagnosed during adolescence (median age 10.5 years), whereas those with PLAGL2 amplification were diagnosed during early childhood (median age 2 years). The 10-year overall survival was 66% for PLAGL1-amplified tumors, 25% for PLAGL2-amplified tumors, 18% for male patients, and 82% for female patients. In summary, we describe a new type of biologically distinct CNS tumor characterized by PLAGL1/2 amplification that occurs predominantly in infants and toddlers (PLAGL2) or adolescents (PLAGL1) which we consider best classified as a CNS embryonal tumor and which is associated with intermediate survival. The cell of origin and optimal treatment strategies remain to be defined.

• MeSH
• dítě MeSH
• DNA vazebné proteiny genetika   metabolismus   MeSH
• kojenec MeSH
• lidé MeSH
• metylace DNA MeSH
• nádorové supresorové proteiny genetika   MeSH
• nádory centrálního nervového systému * genetika   MeSH
• předškolní dítě MeSH
• primitivní neuroektodermové nádory * genetika   MeSH
• proteiny buněčného cyklu genetika   MeSH
• proteiny vázající RNA genetika   MeSH
• signální dráha Wnt genetika   MeSH
• transkripční faktory genetika   metabolismus   MeSH
• Check Tag
• dítě MeSH
• kojenec MeSH
• lidé MeSH
• mužské pohlaví MeSH
• předškolní dítě MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

Triple negative breast cancers (TNBC) are a morphologically and genetically heterogeneous group of breast cancers with uncertain prediction of biological behavior and response to therapy. Epithelial to mesenchymal transition (EMT) is a dynamic process characterized by loss of typical epithelial phenotype and acquisition of mesenchymal characteristics. Aberrant activation of EMT can aggravate the prognosis of patients with cancer, however, the mechanisms of EMT and role of microRNAs (miRNAs) in EMT activation is still unclear. The aim of our study was to analyze miRNA expression within areas of TNBCs with cellular morphology that may be related to the EMT process and discuss possible associations. Out of all 3953 re-examined breast cancers, 460 breast cancers were diagnosed as TNBC (11.64%). With regard to complete tumor morphology preservation, the tissue samples obtained from core-cut biopsies and influenced by previous neoadjuvant therapy were excluded. We assembled a set of selected 25 cases to determine miRNA expression levels in relation to present focal spindle cell and apocrine cell morphology within individual TNBCs. We used descriptive (histological typing and morphology), morphometric, molecular (microdissection of tumor and non-tumor morphologies, RNA isolation and purification, microchip analysis) and bioinformatic analysis (including pathway analysis). The results were verified by quantitative real-time PCR (RT-qPCR) on an extended set of 70 TNBCs. The majority of TNBCs were represented by high-grade invasive carcinomas of no special type (NST) with medullary features characterized by well-circumscribed tumors with central necrosis or fibrosis and frequent tendency to spindle-cell and/or apocrine cell transformation. Apocrine and spindle cell transformation showed a specific miRNA expression profile in comparison to other tumor parts, in situ carcinoma or non-tumor structures, particularly down-regulated expression of hsa-miRNA-143-3p and hsa-miRNA-205-5p and up-regulated expression of hsa-miR-22-3p, hsa-miRNA-185-5p, and hsa-miR-4443. Apocrine cell tumor morphology further revealed decreased expression of hsa-miR-145-5p and increased expression of additional 14 miRNAs (e.g. hsa-miR-182-5p, hsa-miR-3135b and hsa-miR-4417). Pathway analysis for target genes of these miRNAs revealed several shared biological processes (i.e. Wnt signaling, ErbB signaling, MAPK signaling, endocytosis and axon guidance), which may in part contribute to the EMT and tumor progression. We provide the first miRNA expression profiling of specific tissue morphologies in TNBC. Our results demonstrate a specific miRNA expression profile of apocrine and spindle cell morphology which can exhibit a certain similarity with the EMT process and may also be relevant for prognosis and therapy resistance of TNBC.

• MeSH
• apokrinní žlázy * mikrobiologie   patologie   MeSH
• dospělí MeSH
• epitelo-mezenchymální tranzice * genetika   MeSH
• lidé středního věku MeSH
• lidé MeSH
• mikro RNA * genetika   MeSH
• regulace genové exprese u nádorů genetika   MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• signální dráha Wnt genetika   MeSH
• stanovení celkové genové exprese MeSH
• triple-negativní karcinom prsu * genetika   patologie   MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• ženské pohlaví MeSH

Like all developmental processes, odontogenesis is highly complex and dynamically regulated, with hundreds of genes co-expressed in reciprocal networks. Tooth agenesis (missing one or more/all teeth) is a common human craniofacial anomaly and may be caused by genetic variations and/or environmental factors. Variants in PAX9, MSX1, AXIN2, EDA, EDAR, and WNT10A genes are associated with tooth agenesis. Currently, variants in ATF1, DUSP10, CASC8, IRF6, KDF1, GREM2, LTBP3, and components and regulators of WNT signaling WNT10B, LRP6, DKK, and KREMEN1 are at the forefront of interest. Due to the interconnectedness of the signaling pathways of carcinogenesis and odontogenesis, tooth agenesis could be a suitable marker for early detection of cancer predisposition. Variants in genes associated with tooth agenesis could serve as prognostic or therapeutic targets in cancer. This review aims to summarize existing knowledge of development and clinical genetics of teeth. Concurrently, the review proposes possible approaches for future research in this area, with particular attention to roles in monitoring, early diagnosis and therapy of tumors associated with defective tooth development.

• MeSH
• anodoncie epidemiologie   genetika   MeSH
• časná detekce nádoru MeSH
• dědičné nádorové syndromy epidemiologie   genetika   MeSH
• genetická predispozice k nemoci MeSH
• genetické asociační studie MeSH
• karcinogeneze MeSH
• karcinom epidemiologie   genetika   MeSH
• kolorektální nádory epidemiologie   genetika   MeSH
• lidé MeSH
• nádorové biomarkery MeSH
• nádory vaječníků epidemiologie   genetika   MeSH
• nádory žaludku epidemiologie   genetika   MeSH
• nádory epidemiologie   genetika   MeSH
• odontogeneze MeSH
• signální dráha Wnt genetika   MeSH
• signální transdukce genetika   MeSH
• transkripční faktor MSX1 genetika   MeSH
• transkripční faktor PAX9 genetika   MeSH
• změna barvy zubů MeSH
• Check Tag
• lidé MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• přehledy MeSH

Wnt signaling plays an important role in the self-renewal, fate-commitment and survival of the neural stem/progenitor cells (NS/PCs) of the adult central nervous system (CNS). Ischemic stroke impairs the proper functioning of the CNS and, therefore, active Wnt signaling may prevent, ameliorate, or even reverse the negative effects of ischemic brain injury. In this review, we provide the current knowledge of Wnt signaling in the adult CNS, its status in diverse cell types, and the Wnt pathway's impact on the properties of NS/PCs and glial cells in the context of ischemic injury. Finally, we summarize promising strategies that might be considered for stroke therapy, and we outline possible future directions of the field.

• MeSH
• buněčná diferenciace genetika   MeSH
• cílená molekulární terapie metody   trendy   MeSH
• dospělí MeSH
• ischemie mozku genetika   metabolismus   patologie   patofyziologie   MeSH
• lidé MeSH
• mozek cytologie   patologie   fyziologie   MeSH
• nervové kmenové buňky patologie   fyziologie   MeSH
• neurogeneze fyziologie   MeSH
• neuroglie patologie   fyziologie   MeSH
• signální dráha Wnt genetika   fyziologie   MeSH
• tranzitorní ischemická ataka genetika   metabolismus   patologie   terapie   MeSH
• zdraví MeSH
• zvířata MeSH
• Check Tag
• dospělí MeSH
• lidé MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• přehledy MeSH

Colorectal cancer (CRC) is a heterogeneous disease that includes both hereditary and sporadic types of tumors. Tumor initiation and growth is driven by mutational or epigenetic changes that alter the function or expression of multiple genes. The genes predominantly encode components of various intracellular signaling cascades. In this review, we present mouse intestinal cancer models that include alterations in the Wnt, Hippo, p53, epidermal growth factor (EGF), and transforming growth factor β (TGFβ) pathways; models of impaired DNA mismatch repair and chemically induced tumorigenesis are included. Based on their molecular biology characteristics and mutational and epigenetic status, human colorectal carcinomas were divided into four so-called consensus molecular subtype (CMS) groups. It was shown subsequently that the CMS classification system could be applied to various cell lines derived from intestinal tumors and tumor-derived organoids. Although the CMS system facilitates characterization of human CRC, individual mouse models were not assigned to some of the CMS groups. Thus, we also indicate the possible assignment of described animal models to the CMS group. This might be helpful for selection of a suitable mouse strain to study a particular type of CRC.

• MeSH
• epidermální růstový faktor genetika   MeSH
• geny p53 genetika   MeSH
• karcinogeneze genetika   MeSH
• kolorektální nádory klasifikace   metabolismus   patofyziologie   MeSH
• lidé MeSH
• modely nemocí na zvířatech MeSH
• myši MeSH
• nádorová transformace buněk genetika   MeSH
• nádory tračníku genetika   MeSH
• oprava chybného párování bází DNA genetika   MeSH
• protein-serin-threoninkinasy genetika   MeSH
• regulace genové exprese u nádorů genetika   MeSH
• signální dráha Wnt genetika   MeSH
• transformující růstový faktor beta genetika   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• přehledy MeSH

Van Gogh-like (Vangl) and Prickle (Pk) are core components of the non-canonical Wnt planar cell polarity pathway that controls epithelial polarity and cell migration. Studies in vertebrate model systems have suggested that Vangl and Pk may also inhibit signaling through the canonical Wnt/β-catenin pathway, but the functional significance of this potential cross-talk is unclear. In the nematode C. elegans, the Q neuroblasts and their descendants migrate in opposite directions along the anteroposterior body axis. The direction of these migrations is specified by Wnt signaling, with activation of canonical Wnt signaling driving posterior migration, and non-canonical Wnt signaling anterior migration. Here, we show that the Vangl ortholog VANG-1 influences the Wnt signaling response of the Q neuroblasts by negatively regulating canonical Wnt signaling. This inhibitory activity depends on a carboxy-terminal PDZ binding motif in VANG-1 and the Dishevelled ortholog MIG-5, but is independent of the Pk ortholog PRKL-1. Moreover, using Vangl1 and Vangl2 double mutant cells, we show that a similar mechanism acts in mammalian cells. We conclude that cross-talk between VANG-1/Vangl and the canonical Wnt pathway is an evolutionarily conserved mechanism that ensures robust specification of Wnt signaling responses.

• MeSH
• beta-katenin genetika   metabolismus   MeSH
• buněčný rodokmen MeSH
• Caenorhabditis elegans cytologie   genetika   metabolismus   MeSH
• fosfoproteiny genetika   metabolismus   MeSH
• geneticky modifikovaná zvířata MeSH
• geny helmintů MeSH
• homeodoménové proteiny genetika   metabolismus   MeSH
• intracelulární signální peptidy a proteiny genetika   metabolismus   MeSH
• mutace MeSH
• nervové kmenové buňky cytologie   metabolismus   MeSH
• polarita buněk genetika   fyziologie   MeSH
• protein dishevelled genetika   metabolismus   MeSH
• proteiny Caenorhabditis elegans genetika   metabolismus   MeSH
• rozvržení tělního plánu genetika   fyziologie   MeSH
• signální dráha Wnt genetika   fyziologie   MeSH
• transkripční faktory genetika   metabolismus   MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Research Support, N.I.H., Extramural MeSH

The mechanisms leading to autoimmune and inflammatory diseases in the CNS have not been elucidated. The environmental triggers of the aberrant presence of CD4+ T cells in the CNS are not known. In this article, we report that abnormal β-catenin expression in T cells drives a fatal neuroinflammatory disease in mice that is characterized by CNS infiltration of T cells, glial activation, and progressive loss of motor function. We show that enhanced β-catenin expression in T cells leads to aberrant and Th1-biased T cell activation, enhanced expression of integrin α4β1, and infiltration of activated T cells into the spinal cord, without affecting regulatory T cell function. Importantly, expression of β-catenin in mature naive T cells was sufficient to drive integrin α4β1 expression and CNS migration, whereas pharmacologic inhibition of integrin α4β1 reduced the abnormal T cell presence in the CNS of β-catenin-expressing mice. Together, these results implicate deregulation of the Wnt/β-catenin pathway in CNS inflammation and suggest novel therapeutic strategies for neuroinflammatory disorders.

• MeSH
• beta-katenin genetika   imunologie   MeSH
• integrin alfa4beta1 genetika   imunologie   MeSH
• mícha imunologie   patologie   MeSH
• myši knockoutované MeSH
• myši MeSH
• nemoci míchy genetika   imunologie   patologie   MeSH
• signální dráha Wnt genetika   imunologie   MeSH
• Th1 buňky imunologie   patologie   MeSH
• zánět genetika   imunologie   patologie   MeSH
• zvířata MeSH
• Check Tag
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

Leucine-rich repeat-containing G-protein-coupled receptor 4 (LGR4) is produced in a broad spectrum of mouse embryonic and adult tissues and its deficiency results in embryonal or perinatal lethality. The LGR4 function was mainly related to its potentiation of canonical Wnt signaling; however, several recent studies associate LGR4 with additional signaling pathways. To obtain a suitable tool for studying the signaling properties of Lgr4, we generated a tagged variant of the Lgr4 receptor using gene targeting in the mouse oocyte. The modified Lgr4 allele expresses the Lgr4 protein fused with a triple hemagglutinin (3HA) tag located at the extracellular part of the protein. The allele is fully functional, enabling tracking of Lgr4 expression in the mouse tissues. We also show that via surface labeling, the 3HA tag allows direct isolation and analysis of living Lgr4-positive cells obtained from the small intestinal crypts. Finally, the HA tag-specific antibody can be employed to characterize the biochemical features of Lgr4 and to identify possible biding partners of the protein in cells derived from various mouse tissues.

• MeSH
• alely MeSH
• genový targeting metody   MeSH
• hemaglutininy genetika   MeSH
• lidé MeSH
• myši MeSH
• oocyty metabolismus   MeSH
• receptory spřažené s G-proteiny genetika   MeSH
• signální dráha Wnt genetika   MeSH
• těhotenství MeSH
• tkáňová distribuce MeSH
• vazba proteinů genetika   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• myši MeSH
• těhotenství MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH

Nephronophthisis-related ciliopathies (NPHP-RC) are recessive diseases characterized by renal dysplasia or degeneration. We here identify mutations of DCDC2 as causing a renal-hepatic ciliopathy. DCDC2 localizes to the ciliary axoneme and to mitotic spindle fibers in a cell-cycle-dependent manner. Knockdown of Dcdc2 in IMCD3 cells disrupts ciliogenesis, which is rescued by wild-type (WT) human DCDC2, but not by constructs that reflect human mutations. We show that DCDC2 interacts with DVL and DCDC2 overexpression inhibits β-catenin-dependent Wnt signaling in an effect additive to Wnt inhibitors. Mutations detected in human NPHP-RC lack these effects. A Wnt inhibitor likewise restores ciliogenesis in 3D IMCD3 cultures, emphasizing the importance of Wnt signaling for renal tubulogenesis. Knockdown of dcdc2 in zebrafish recapitulates NPHP-RC phenotypes, including renal cysts and hydrocephalus, which is rescued by a Wnt inhibitor and by WT, but not by mutant, DCDC2. We thus demonstrate a central role of Wnt signaling in the pathogenesis of NPHP-RC, suggesting an avenue for potential treatment of NPHP-RC.

• MeSH
• adaptorové proteiny signální transdukční genetika   metabolismus   MeSH
• beta-katenin antagonisté a inhibitory   metabolismus   MeSH
• buňky NIH 3T3 MeSH
• cilie genetika   patologie   MeSH
• cystická onemocnění ledvin genetika   MeSH
• dánio pruhované genetika   MeSH
• exony MeSH
• fenotyp MeSH
• fosfoproteiny genetika   metabolismus   MeSH
• HEK293 buňky MeSH
• ledviny patologie   MeSH
• lidé MeSH
• mutace MeSH
• myši MeSH
• proteiny asociované s mikrotubuly genetika   metabolismus   MeSH
• signální dráha Wnt genetika   MeSH
• transmisní elektronová mikroskopie MeSH
• výpočetní biologie 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

Nuclear factor kappa B (NF-κB) signaling plays critical roles in many physiological and pathological processes, including regulating organogenesis. Down-regulation of NF-κB signaling during development results in hypohidrotic ectodermal dysplasia. The roles of NF-κB signaling in tooth development, however, are not fully understood. We examined mice overexpressing IKKβ, an essential component of the NF-κB pathway, under keratin 5 promoter (K5-Ikkβ). K5-Ikkβ mice showed supernumerary incisors whose formation was accompanied by up-regulation of canonical Wnt signaling. Apoptosis that is normally observed in wild-type incisor epithelium was reduced in K5-Ikkβ mice. The supernumerary incisors in K5-Ikkβ mice were found to phenocopy extra incisors in mice with mutations of Wnt inhibitor, Wise. Excess NF-κB activity thus induces an ectopic odontogenesis program that is usually suppressed under physiological conditions.

• MeSH
• ameloblasty cytologie   MeSH
• amelogenin analýza   MeSH
• apoptóza fyziologie   MeSH
• epitel embryologie   MeSH
• fenotyp MeSH
• keratin-15 genetika   MeSH
• kinasa I-kappa B fyziologie   MeSH
• kostní morfogenetické proteiny genetika   MeSH
• mikroradiografie metody   MeSH
• mutace genetika   MeSH
• mutantní kmeny myší MeSH
• myši MeSH
• NF-kappa B fyziologie   MeSH
• odontogeneze fyziologie   MeSH
• promotorové oblasti (genetika) genetika   MeSH
• proteiny hedgehog fyziologie   MeSH
• receptory buněčného povrchu fyziologie   MeSH
• rentgenová mikrotomografie metody   MeSH
• řezáky abnormality   embryologie   MeSH
• signální dráha Wnt genetika   fyziologie   MeSH
• zobrazování trojrozměrné metody   MeSH
• zubní sklovina cytologie   MeSH
• zubní zárodek abnormality   embryologie   MeSH
• zuby přespočetné etiologie   genetika   MeSH
• zvířata MeSH
• Check Tag
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH