102 research outputs found

    Radiation Induced Apoptosis of Murine Bone Marrow Cells is Independent of Early Growth Response 1 (EGR1)

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    An understanding of how each individual 5q chromosome critical deleted region (CDR) gene contributes to malignant transformation would foster the development of much needed targeted therapies for the treatment of therapy related myeloid neoplasms (t-MNs). Early Growth Response 1 (EGR1) is a key transcriptional regulator of myeloid differentiation located within the 5q chromosome CDR that has been shown to regulate HSC (hematopoietic stem cell) quiescence as well as the master regulator of apoptosis—p53. Since resistance to apoptosis is a hallmark of malignant transformation, we investigated the role of EGR1 in apoptosis of bone marrow cells; a cell population from which myeloid malignancies arise. We evaluated radiation induced apoptosis of Egr1+/+ and Egr1-/- bone marrow cells in vitro and in vivo. EGR1 is not required for radiation induced apoptosis of murine bone marrow cells. Neither p53 mRNA (messenger RNA) nor protein expression is regulated by EGR1 in these cells. Radiation induced apoptosis of bone marrow cells by double strand DNA breaks induced p53 activation. These results suggest EGR1 dependent signaling mechanisms do not contribute to aberrant apoptosis of malignant cells in myeloid malignancies

    A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)

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    Le glissement du Friolin, en Savoie : mesures par imagerie numérique

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    Les techniques de traitement d’images utilisées en télédétection rendent possible une approche nouvelle de l'étude des versants instables.Leur application au versant Est du Friolin, siège d'un mouvement majeur en 1982, a permis de confirmer objectivement l'interprétation des désordres observés : glissement de type rotationnel, par lequel une dizaine de millions de m3 de rocher sont descendus quasiment en bloc, d'une cinquantaine de mètres d'altitude.L'analyse photogrammétrique de deux couples de photographies aériennes scannérisées caractérise le glissement et les changements survenus dans la forme du versant. Le repérage de points images (pixels) homologues sur les scènes d'avant et après glissement révèle une déformation significative du volume glissé : écrasement dans le sens de la pente, insoupçonnable autrement

    Cell-type-specific receptors for alpha-fetoprotein in a mouse T-lymphoma cell line.

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