152 results match your criteria: "2nd Faculty of Medicine and University Hospital Motol[Affiliation]"

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Article Synopsis
  • *Research has previously linked variants in the A2ML1 gene to Noonan syndrome, but evidence to confirm this link is lacking.
  • *In a study of 15 individuals with rare A2ML1 variants, it was found that these variants often came from unaffected parents and were linked to other genetic issues, challenging the idea that A2ML1 is a primary cause of Noonan syndrome.
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Most genes associated with neurodevelopmental disorders (NDDs) were identified with an excess of de novo mutations (DNMs) but the significance in case-control mutation burden analysis is unestablished. Here, we sequence 63 genes in 16,294 NDD cases and an additional 62 genes in 6,211 NDD cases. By combining these with published data, we assess a total of 125 genes in over 16,000 NDD cases and compare the mutation burden to nonpsychiatric controls from ExAC.

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An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Background: The immunological microenvironment of primary high-grade serous carcinomas (HGSCs) has a major impact on disease outcome. Conversely, little is known on the microenvironment of metastatic HGSCs and its potential influence on patient survival. Here, we explore the clinical relevance of the immunological configuration of HGSC metastases.

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Calreticulin and cancer.

Cell Res

January 2021

Department of Radiation Oncology, Weill Cornell Medical College, New York, NY, USA.

Calreticulin (CALR) is an endoplasmic reticulum (ER)-resident protein involved in a spectrum of cellular processes. In healthy cells, CALR operates as a chaperone and Ca buffer to assist correct protein folding within the ER. Besides favoring the maintenance of cellular proteostasis, these cell-intrinsic CALR functions support Ca-dependent processes, such as adhesion and integrin signaling, and ensure normal antigen presentation on MHC Class I molecules.

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Hormone receptor (HR) breast cancer (BC) causes most BC-related deaths, calling for improved therapeutic approaches. Despite expectations, immune checkpoint blockers (ICBs) are poorly active in patients with HR BC, in part reflecting the lack of preclinical models that recapitulate disease progression in immunocompetent hosts. We demonstrate that mammary tumors driven by medroxyprogesterone acetate (M) and 7,12-dimethylbenz[a]anthracene (D) recapitulate several key features of human luminal B HRHER2 BC, including limited immune infiltration and poor sensitivity to ICBs.

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  • Nontruncating variants in the SMARCA2 gene are linked to Nicolaides-Baraitser syndrome (NCBRS), characterized by intellectual disability and congenital anomalies, but other disorders associated with SMARCA2 were unclear.
  • Researchers found SMARCA2 variants in 20 individuals with syndromic neurodevelopmental disorders that did not fit the criteria for NCBRS and analyzed these variants functionally and through genetic testing.
  • Results revealed a new syndrome called blepharophimosis intellectual disability syndrome (BIS), which shares some features with NCBRS but is distinct both phenotypically and at the molecular level, primarily due to the location of the SMARCA2 variants.
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Telemedicine strategy of the European Reference Network ITHACA for the diagnosis and management of patients with rare developmental disorders.

Orphanet J Rare Dis

April 2020

Manchester Centre for Genomic Medicine, St Mary's Hospital, Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Sciences Centre, Manchester, M13 9WL, UK.

Article Synopsis
  • The European Reference Networks (ERNs) are collaborative virtual platforms for healthcare providers in Europe to address complex and rare diseases using the Clinical Patient Management System (CPMS) for secure consultations.
  • After one year of using CPMS, the ERN ITHACA network became a top performer in telemedicine activity, sharing insights on 28 rare cases from various countries, while emphasizing the importance of data protection for patient care.
  • The collaboration between the ERN ITHACA team, EU officials, and clinical genetics centers led to the development of a tailored CPMS, enhancing its effectiveness for specific telemedicine needs and improving care outcomes.
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Cells succumbing to stress via regulated cell death (RCD) can initiate an adaptive immune response associated with immunological memory, provided they display sufficient antigenicity and adjuvanticity. Moreover, multiple intracellular and microenvironmental features determine the propensity of RCD to drive adaptive immunity. Here, we provide an updated operational definition of immunogenic cell death (ICD), discuss the key factors that dictate the ability of dying cells to drive an adaptive immune response, summarize experimental assays that are currently available for the assessment of ICD in vitro and in vivo, and formulate guidelines for their interpretation.

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Trial watch: chemotherapy-induced immunogenic cell death in immuno-oncology.

Oncoimmunology

July 2021

Cell Death Research & Therapy (CDRT) unit, Department of Cellular & Molecular Medicine, KU Leuven, Leuven, Belgium.

The term 'immunogenic cell death' (ICD) denotes an immunologically unique type of regulated cell death that enables, rather than suppresses, T cell-driven immune responses that are specific for antigens derived from the dying cells. The ability of ICD to elicit adaptive immunity heavily relies on the immunogenicity of dying cells, implying that such cells must encode and present antigens not covered by central tolerance (antigenicity), and deliver immunostimulatory molecules such as damage-associated molecular patterns and cytokines (adjuvanticity). Moreover, the host immune system must be equipped to detect the antigenicity and adjuvanticity of dying cells.

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Calreticulin (CALR) exposed on the surface of cancer cells succumbing to therapy delivers robust phagocytic signals that support the activation of adaptive anticancer immune responses. Recent data from our group demonstrate that spontaneous CARL exposure on leukemic blasts also supports innate anticancer immunity by natural killer (NK) cells via an indirect mechanism relying on myeloid CD11cCD14 cells.

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Immunogenic cell death (ICD), a functionally peculiar type of apoptosis, represents a unique way to deliver danger-associated molecular patterns (DAMPs) to the tumor microenvironment. Once emitted by dying cancer cells, DAMPs orchestrate antigen-specific immune responses by acting on both innate and adaptive components of the immune system. Accumulating preclinical and clinical evidence indicates that one of these DAMPs, calreticulin (CALR) represents a novel powerful prognostic biomarker, reflecting the activation of a clinically relevant anticancer immune response in different cancer malignancies.

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Assessment of NK cell-mediated cytotoxicity by flow cytometry after rapid, high-yield isolation from peripheral blood.

Methods Enzymol

January 2021

Department of Immunology, Charles University, 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic; Sotio, Prague, Czech Republic. Electronic address:

Natural killer (NK) cells constitute the predominant innate lymphocyte subset that mediates the anti-viral and anti-tumor immune responses. NK cells use an array of innate receptors to sense their environment and to respond to infections, cellular stress and transformation. The resulting NK cell activation, including cytotoxicity and cytokine production, is a fundamental component of the early immune response.

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Detection of tumor antigens and tumor-antigen specific T cells in NSCLC patients: Correlation of the quality of T cell responses with NSCLC subtype.

Immunol Lett

March 2020

Sotio, Prague, Czech Republic; Department of Immunology, 2nd Faculty of Medicine and University Hospital Motol, Charles University, Czech Republic. Electronic address:

Allogeneic cancer cell lines serve as universal source of tumor-associated antigens in cancer vaccines. Immunogenic high hydrostatic pressure-killed cancer cells derived from cell lines can be used for the generation of dendritic cell (DC)-based active cellular immunotherapy of non-small cell lung cancer (NSCLC). We investigated the expression of 12 known NSCLC tumor-associated antigens (TAA) (CEA, MAGE-A1, MAGE-A3, MAGE-A4, PRAME, hTERT, HER2, MUC1, Survivin, STEAP1, SOX2 and NY-ESO-1) in 6 NSCLC cell lines as candidates for the generation of DC-based lung cancer vaccine.

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Background: Adjuvanticity, which is the ability of neoplastic cells to deliver danger signals, is critical for the host immune system to mount spontaneous and therapy-driven anticancer immune responses. One of such signals, i.e.

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Dendritic cells (DCs) are key regulators of immune responses that operate at the interface between innate and adaptive immunity, and defects in DC functions contribute to the pathogenesis of a variety of disorders. For instance, cancer evolves in the context of limited DC activity, and some autoimmune diseases are initiated by DC-dependent antigen presentation. Thus, correcting aberrant DC functions stands out as a promising therapeutic paradigm for a variety of diseases, as demonstrated by an abundant preclinical and clinical literature accumulating over the past two decades.

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The most important findings revealing pathogenesis, molecular characteristics, genotyping and targeted therapy of gastrointestinal stromal tumors (GISTs) are activated oncogenic mutations in KIT and PDGFRA genes. Imatinib mesylate (IM), which inhibits both KIT and PDGFRA receptors, significantly improved treatment of advanced (metastatic, recurrent, and/or inoperable) GISTs. However, in a significant number of patients the treatment fails due to the primary or secondary resistance to targeted therapy.

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Caspase 3 (CASP3) has a key role in the execution of apoptosis, and many cancer cells are believed to disable CASP3 as a mechanism of resistance to cytotoxic therapeutics. Alongside, CASP3 regulates stress-responsive immunomodulatory pathways, including secretion of type I interferon (IFN). Here, we report that mouse mammary carcinoma TSA cells lacking or subjected to chemical caspase inhibition were as sensitive to the cytostatic and cytotoxic effects of radiation therapy (RT) as their control counterparts, yet secreted increased levels of type I IFN.

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Missense Mutations in NKAP Cause a Disorder of Transcriptional Regulation Characterized by Marfanoid Habitus and Cognitive Impairment.

Am J Hum Genet

November 2019

Division of Human Genetics, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA; Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA; Division of Genomic Diagnostics, Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA; Laboratory of Rare Disease Research, Institute for Quantitative Biosciences, The University of Tokyo, Tokyo 113-8657, Japan. Electronic address:

NKAP is a ubiquitously expressed nucleoplasmic protein that is currently known as a transcriptional regulatory molecule via its interaction with HDAC3 and spliceosomal proteins. Here, we report a disorder of transcriptional regulation due to missense mutations in the X chromosome gene, NKAP. These mutations are clustered in the C-terminal region of NKAP where NKAP interacts with HDAC3 and post-catalytic spliceosomal complex proteins.

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The importance of gonadal mosaicism in families with apparently de novo mutations is being increasingly recognized. We report on two affected brothers initially suggestive of X-linked or autosomal recessive inheritance. Malan syndrome due to shared NFIX variants was diagnosed in the brothers using exome sequencing.

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Background: Intellectual disability (ID) is a feature of many rare diseases caused by thousands of genes. This genetic heterogeneity implies that pathogenic variants in a specific gene are found only in a small number of patients, and difficulties arise in the definition of prevailing genotype and characteristic phenotype associated with that gene. One of such very rare disorders is autosomal recessive ID type 66 (OMIM #618221) caused by defects in C12orf4.

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A systematic review on the genetic analysis of paragangliomas: primarily focused on head and neck paragangliomas.

Neoplasma

September 2019

Department of Otorhinolaryngology, 3rd Faculty of Medicine and Kralovske Vinohrady University Hospital, Charles University, Prague, Czech Republic.

Head and neck paragangliomas Paragangliomas and pheochromocytomas are rare, mostly benign neuroendocrine tumors, which are embryologically derived from neural crest cells of the autonomic nervous system. Paragangliomas are essentially the extra-adrenal counterparts of pheochromocytomas. As such this family of tumors can be subdivided into head and neck paragangliomas, pheochromocytomas and thoracic and abdominal extra-adrenal paragangliomas.

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Radiotherapy (RT) plays an important role in the management of cancer patients. RT is used in more than 50% of patients during the course of their disease in a curative or palliative setting. In the past decades it became apparent that the abscopal effect induced by RT might be dependent on the activation of immune system, and that the induction of immunogenic cancer cell death and production of danger-associated molecular patterns from dying cells play a major role in the radiotherapy-mediated anti-tumor efficacy.

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