100,661 research outputs found
Consumos culturales en jóvenes ingresantes de las universidades de Buenos Aires y de Lomas de Zamora
No full textFil: Marafioti, Roberto. Universidad Nacional de Quilmes; Argentina.Fil: Marafioti, Roberto. Universidad de Buenos Aires; Argentina.Fil: Cormick, Hugo T. Universidad Nacional de Lomas de Zamora; Argentina.Fil: Cormick, Hugo T. Universidad de Buenos Aires; Argentina.El presente articulo pretende ser una síntesis de los resultados obtenidos en una investigación realizada en el curso del año académico de 1993 en el ámbito de la Secretaría de Investigaciones de la Facultad de Ciencias Sociales de la Universidad Nacional de Lomas de Zamora. El objetivo del trabajo residía en comparar la población de ingresantes universitarios en la Facultad de Ciencias Sociales de la Universidad de Lomas de Zamora y en el Ciclo Básico Común de la Universidad de Buenos Aires. El trabajo se realizó en el marco de las cátedras de Problemática de la Comunicación (UNLZ) y Semiología del Ciclo Básico Común (UBA)
BCL-6 gene shows a characteristic mutation pattern in primary mediastinal B cell lymphoma.
No full textLe garanzie difensive e il ruolo del difensore nello spazio giudiziario europeo alla luce della direttiva sull’OEI
No full textIntracellular signalling molecules as immunohistochemical markers of normal and neoplastic human leucocytes in routine biopsy samples.
No full textWe have investigated whether intracellular signal transduction molecules can be used as immunohistological markers of normal and neoplastic human leucocytes in routine tissue sections. We obtained selective labelling of white cells for eight such molecules (the 'linker' molecules SLP-76 and BLNK, the Src family kinases Lyn, Fyn, Syk and Hck, and the phospholipases PLC-gamma1 and PLC-gamma2). Antibodies to SLP-76 and PLC-gamma1 selectively labelled T cells, and antibodies to BLNK, Lyn, Fyn, Syk and PLC-gamma2 labelled B cells (although Fyn immunostaining was restricted to mantle zone B cells). Antibodies to the Syk and Hck kinases labelled probable thymocyte precursors at the periphery of the thymic cortex. In addition to lymphoid cells, several other leucocyte types were immunostained (e.g. SLP-76, Lyn, Syk and Hck were found in megakaryocytes, myeloid cells and/or macrophages, and PLC-gamma2 was detected in arterial endothelium). SLP-76 and PLC-gamma1 were found in most T-cell lymphomas studied, and some B-cell lymphomas were also positive for PLC-gamma1 (e.g. diffuse large cell and Burkitt's lymphoma). The five B cell-associated markers were found in most B-cell non-Hodgkin's lymphomas, although some diffuse large B-cell lymphomas were negative (e.g. for Lyn) and anti-Fyn tended not to stain small B-cell neoplasms. The observation that a range of leucocyte signalling molecules can be detected in routine biopsies offers new possibilities for studying normal and neoplastic human white cells in diagnostic tissue samples
Nodal reactive and neoplastic proliferation of monocytoid and marginal zone B cells: an immunoarchitectural and molecular study highlighting the relevance of IRTA1 and T-bet as positive markers.
No full textAIMS:
Marginal zone B cells (MZCs) and monocytoid B cells (MBCs) appear to be related lymphoid cells that take part in reactive and neoplastic marginal zone proliferations. These lesions are not yet well characterized, and the aim of this study was to find better diagnostic criteria for them.
METHODS AND RESULTS:
We analysed 60 nodal lesions with MBC and/or MZC proliferation for their morphological, immunophenotypic, molecular genetic and IG gene rearrangement features. On the basis of the results of the rearrangement assay and immunoglobulin light chain restriction, the lesions were divided into reactive and neoplastic groups. Among the neoplastic lesions, polymorphic and monomorphic subgroups emerged. All reactive lesions had morphological features of the polymorphic subgroup. By immunohistochemistry, IRTA1 and/or T-bet expression was found in all reactive lesions and in 90% of neoplastic lesions.
CONCLUSIONS:
IRTA1 and T-bet are positive markers for the identification of MZC/MBC proliferations, and thus for the diagnosis of nodal marginal zone lymphoma (NMZL). Polymorphic and monomorphic subgroups of NMZL could be distinguished. Most morphological and immunophenotypic patterns in reactive and neoplastic nodal expansions of MZCs and MBCs overlapped. Therefore, PCR clonality assay of the immunoglobulin heavy and light chain gene loci is the most reliable method for their differentiation
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Peripheral T cell lymphomas with follicular T helper phenotype: a new basket or a distinct entity? Revising Karl Lennert's personal archive
No full textAIMS:
To revise 25 cases selected from Karl Lennert's personal archive (21) and Bologna and Frankfurt Registries (four) because of cytological similarities.
METHODS AND RESULTS:
All cases were provided with paraffin blocks and studied by immunohistochemistry and molecular techniques. While phenotyping was very informative, among molecular studies only EBER in situ-hybridization (ISH) was successful. Twenty-two cases were concluded as peripheral T cell lymphomas (PTCL). Of these, six were reclassified as angioimmunoblastic T cell lymphoma (AITL), 13 as PTCL, not otherwise specified (NOS), including four follicular variants and one tumour with T-zone pattern, and three as borderline tumours between AITL and PTCL/NOS. All these cases consisted homogeneously of small/medium-sized elements with mild nuclear atypia and an evident rim of clear/pale cytoplasm. On immunohistochemistry, they regularly expressed three to six follicular helper T cell (FTH)-associated markers. EBER-ISH revealed scattered EBV-infected B cells in all tumours except those with 'follicular' growth pattern. The content of follicular dendritic cells and high-endothelial venules varied significantly depending on the histotype.
CONCLUSIONS:
This study shows that: (i) historical material can be still employed usefully, and (ii) the FTH-phenotype corresponds to a broad spectrum of PTCLs that might form a new category to be validated in future molecular and clinicopathological analyses
Ordine europeo di indagine penale e garanzie della difesa. Brevi osservazioni a margine della direttiva 2014/41/UE
No full textSi esamina l’ordine europeo d’indagine dalla prospettiva difensiva, al fine della verifica dell’attitudine probatoria del dato raccolto “ultra fines
Leukocyte-specific phosphoprotein-1 and PU.1: two useful markers for distinguishing T-cell-rich B-cell lymphoma from lymphocyte-predominant Hodgkin's disease.
No full textBACKGROUND AND OBJECTIVES:
T-cell-rich B-cell lymphoma is a rare variant of diffuse large B-cell lymphoma. It shows morphologic, phenotypic and molecular similarities to lymphocyte predominant Hodgkin's disease, and in consequence the two diseases may sometimes be difficult to distinguish. In this paper, we have evaluated the usefulness of the pan-leukocyte marker LSP1 and the transcription factor PU.1 for resolving such diagnostic problems.
DESIGN AND METHODS:
Immunohistochemical techniques were used to investigate the expression of LSP1 and PU.1 in 34 tumors, comprising typical examples of T-cell-rich B-cell lymphoma (15 cases), lymphocyte-predominant Hodgkin's disease (13 cases), and lymphocyte-rich classical Hodgkin's disease (6 cases).
RESULTS:
The neoplastic cells of T-cell-rich B-cell lymphoma were LSP1-positive and PU.1-negative, whereas the lymphocytic and/or histiocytic (L&H) cells of lymphocyte-predominant Hodgkin's disease were mostly LSP1-negative, with variable PU.1 expression. The two markers did not discriminate between T-cell-rich B-cell lymphoma and lymphocyte-rich classical Hodgkin's disease, whilst they concurred to the distinction between lymphocyte-predominant and lymphocyte-rich classical Hodgkin's disease by integrating the already available tools.
INTERPRETATION AND CONCLUSIONS:
Antibodies to LSP1 and PU.1 may represent useful reagents for the differential diagnosis between T-cell-rich B-cell lymphoma and lymphocyte-predominant Hodgkin's disease
Expression of intracellular signaling molecules in classical and lymphocyte predominance Hodgkin disease.
No full textThe neoplastic cells in classical Hodgkin disease (Reed-Sternberg cells) are of B-lymphoid origin, but they lack many markers of this cell lineage, for example, immunoglobulin, CD20, and B-cell-associated transcription factors. In contrast, the neoplastic cells ("L&H" cells) in lymphocyte predominance Hodgkin disease retain the molecular profile of germinal center B cells. In this paper, we investigated the expression in Hodgkin disease (45 cases and 3 cell lines) of 5 intracellular signaling molecules found in B cells. The Src family kinase Syk, the B-cell adaptor protein BLNK, and phospholipase C (PLC)-gamma2 were consistently absent from Reed-Sternberg cells, whereas 2 other Src kinases (Lyn and Fyn) were heterogeneously expressed in a proportion of cases (12% and 42%, respectively). In contrast, the tumor cells in all cases of lymphocyte predominance Hodgkin disease were positive for Fyn, Syk, BLNK, and PLC-gamma2, and Lyn immunostaining was seen in a minority of biopsies. These results indicate that in Reed-Sternberg cells, the defect in B-cell lineage marker expression includes a spectrum of molecules involved in intracellular signaling, a finding in keeping with recent gene expression profiling studies. Furthermore, the clear difference in expression of signaling proteins between the 2 major subtypes of Hodgkin disease may be of diagnostic value
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