16 research outputs found
Connaßtre ses visiteurs en ligne : quels outils, quelles méthodes ?
Lever les yeux est un prototype imaginĂ© au musĂ©e Dauphinois comme une expĂ©rience entre contemplation et mĂ©diation. © MusĂ©e Dauphinois/Denis Vinçon Visiter une exposition dans un espace de rĂ©alitĂ© virtuelle ; arpenter, Ă lâaide de sa souris, une salle dâexposition reconstituĂ©e en profondeur sur son Ă©cran dâordinateur ; explorer une salle par robot interposĂ© ou encore faire lâexpĂ©rience dâune Ćuvre grĂące Ă un site Internet complĂ©mentaire Ă lâexposition physique sont autant dâexpĂ©riences de dĂ©c..
ASB2 is an Elongin BC-interacting protein that can assemble with Cullin 5 and Rbx1 to reconstitute an E3 ubiquitin ligase complex.
International audience; The ankyrin repeat-containing protein with a suppressor of cytokine signaling box-2 (ASB2) gene was identified as a retinoic acid-response gene and a target of the promyelocytic leukemia-retinoic acid receptor-alpha oncogenic protein characteristic of acute promyelocytic leukemia. Expression of ASB2 in myeloid leukemia cells inhibits growth and promotes commitment, recapitulating an early step known to be critical for differentiation. Here we show that ASB2, by interacting with the Elongin BC complex, can assemble with Cullin5.Rbx1 to form an E3 ubiquitin ligase complex that stimulates polyubiquitination by the E2 ubiquitin-conjugating enzyme Ubc5. This is a first indication that a member of the ASB protein family, ASB2, is a subunit of an ECS (Elongin C-Cullin-SOCS box)-type E3 ubiquitin ligase complex. Altogether, our results strongly suggest that ASB2 targets specific proteins to destruction by the proteasome in leukemia cells that have been induced to differentiate
Caractérisation fonctionnelle d'ASB2 (une protéine impliquée dans la différenciation myéloïde)
Le gĂšne ASB2, identifiĂ© par criblage diffĂ©rentiel dans une lignĂ©e dĂ©rivant d'un patient atteint de leucĂ©mie aiguĂ« promyĂ©locytaire (LAP), code une protĂ©ine comportant onze rĂ©pĂ©titions ankyrine et une boĂźte SOCS contenant un motif BC. Via ce motif BC, ASB2 interagit avec le complexe des ELONGINES B/C suggĂ©rant qu'ASB2 appartiendrait Ă un complexe E3 Ă activitĂ© ubiquitine ligase permettant la dĂ©gradation par le protĂ©asome de protĂ©ines cibles. Sa surexpression dans des cellules de leucĂ©mie myĂ©loĂŻde induit des phĂ©nomĂšnes caractĂ©ristiques des Ă©tapes d'engagement vers la diffĂ©renciation. ASB2 prĂ©sente toutes les caractĂ©ristiques d'un gĂšne critique de la diffĂ©renciation myĂ©loĂŻde : il est rĂ©primĂ© par PML-RARa dans les cellules de LAP et rĂ©activĂ© aprĂšs traitement Ă l'acide rĂ©tinoĂŻque. Ces travaux suggĂšrent qu'ASB2 pourrait ĂȘtre impliquĂ© dans les Ă©tapes prĂ©coces de la diffĂ©renciation myĂ©loĂŻde en ciblant des rĂ©gulateurs clĂ©s de l'hĂ©matopoĂŻĂšse vers le systĂšme de dĂ©gradation par le protĂ©asome.ASB2 gene, identified by a subtractive screening in a cell line derived from a patient with acute promyelocytic leukemia (APL), encodes a protein with eleven ankyrin repeats and a SOCS box including a BC box. ASB2 interacts, via its BC box, with ELONGIN B/C complex suggesting that it could belong to an E3 complex with an ubiquitine ligase activity leading to proteasomal degradation of target proteins. ASB2 overexpression in myeloid leukemic cells induces phenomena characteristics of commitment to differentiation. ASB2 presents all the characteristics of a critical gene for myeloid differentiation : it is repressed by PML-RARa in APL cells and reactivated after retinoic acid tratment. These results suggest that ASB2 could be involved in early steps of myeloid differentiation targeting key hematopoietic regulators to proteasomal degradation.PARIS5-BU Saints-PĂšres (751062109) / SudocSudocFranceF
Connaßtre ses visiteurs en ligne : quels outils, quelles méthodes ?
International audienceAprĂšs avoir dressĂ© une typologie des diffĂ©rentes formes de prĂ©sence du musĂ©e sur Internet, lâauteur propose, Ă travers une Ă©tude menĂ©e en partenariat avec le musĂ©e Dauphinois, une mĂ©thodologie pour conduire une observation destinĂ©e Ă apprĂ©hender les pratiques des internautes vis-Ă -vis du musĂ©e et montre comment lâinstitution musĂ©ale peut mettre en Ćuvre des outils afin de mieux connaĂźtre ces usagers spĂ©cifiques que sont les visiteurs-internautes
JAML, a novel protein with characteristics of a junctional adhesion molecule, is induced during differentiation of myeloid leukemia cells
International audienceRetinoic acid induces clinical remission in acute promyelocytic leukemia (APL) by triggering differentiation of leukemia promyelocytes. Here, we have characterized a gene encoding a member of the immunoglobulin superfamily, among novel retinoic acid-induced genes identified in APL cells. This protein, which was named JAML (junctional adhesion molecule-like), contains 2 extracellular immunoglobulin-like domains, a transmembrane segment, and a cytoplasmic tail. JAML mRNA is expressed in hematopoietic tissues and is prominently expressed in granulocytes. The fact that JAML protein is localized at the cell plasma membrane in the areas of cell-cell contacts, whereas it is not detected at free cell borders, suggests that JAML is engaged in homophilic interactions. Furthermore, a conserved dimerization motif among JAM members was shown to be important for JAML localization at the cell membrane. Finally, exogenous expression of JAML in myeloid leukemia cells resulted in enhanced cell adhesion to endothelial cells. Altogether, our results point to JAML as a novel member of the JAM family expressed on leukocytes with a possible role in leukocyte transmigration
ASB-2 Inhibits Growth and Promotes Commitment in Myeloid Leukemia Cells*
International audienceIn acute promyelocytic leukemia (APL) cells harboringthe promyelocytic leukemia retinoic acid receptor (PML-RAR) chimeric protein, retinoic acid (RA)-induceddifferentiation is triggered through a PML-RARsignaling resulting in activation of critical target genes.Induced differentiation of APL cells is always precededby withdrawal from the cell cycle and commitmentevents leading to terminal differentiation. Here we haveidentified the human ankyrin repeat-containing proteinwith a suppressor of cytokine signaling box-2 (ASB-2)cDNA, as a novel RA-induced gene in APL cells. PMLRAR strongly enhanced RA-induced ASB-2 mRNA expression.In myeloid leukemia cells, ASB-2 expressioninduced growth inhibition and chromatin condensationrecapitulating early events critical to RA-induced differentiationof APL cells
ASB2 Is an Elongin BC-interacting Protein That Can Assemble with Cullin 5 and Rbx1 to Reconstitute an E3 Ubiquitin Ligase Complex
International audienceThe ankyrin repeat-containing protein with a suppressor of cytokine signaling box-2 (ASB2) gene was identified as a retinoic acid-response gene and a target of the promyelocytic leukemia-retinoic acid receptor-alpha oncogenic protein characteristic of acute promyelocytic leukemia. Expression of ASB2 in myeloid leukemia cells inhibits growth and promotes commitment, recapitulating an early step known to be critical for differentiation. Here we show that ASB2, by interacting with the Elongin BC complex, can assemble with Cullin5.Rbx1 to form an E3 ubiquitin ligase complex that stimulates polyubiquitination by the E2 ubiquitin-conjugating enzyme Ubc5. This is a first indication that a member of the ASB protein family, ASB2, is a subunit of an ECS (Elongin C-Cullin-SOCS box)-type E3 ubiquitin ligase complex. Altogether, our results strongly suggest that ASB2 targets specific proteins to destruction by the proteasome in leukemia cells that have been induced to differentiate
juillet-août 2017
La mĂ©diation numĂ©rique dans les institutions musĂ©ales Les outils numĂ©riques sont devenus les compagnons indispensables de la mĂ©diation culturelle mais leur usage ne manque pas de questionner les professionnels des musĂ©es, notamment sur la place des publics, le profil des utilisateurs, le rĂŽle dĂ©volu Ă ces outils⊠Ainsi, la premiĂšre contribution de ce nouveau numĂ©ro de La Lettre de lâOcim montre comment lâinstitution musĂ©ale peut mettre en place une dĂ©marche pour apprĂ©hender le public qui frĂ©quente le musĂ©e sur Internet, observer et comprendre les pratiques des internautes, tenter de mesurer la rĂ©ception de ses actions en dehors de lâĂ©tablissement. Par ailleurs, Ă travers lâanalyse de lâutilisation dâune table tactile interactive restituant lâĂ©volution dans le temps et lâamĂ©nagement dâun site archĂ©ologique, une seconde contribution sâinterroge sur la place de cet outil numĂ©rique dans la mĂ©diation, relevant lâimportance de la transmission humaine des savoirs et du patrimoine. Enfin ce numĂ©ro propose une nouvelle rubrique « Une collection â Un objet de musĂ©e » qui dĂ©sormais prĂ©sentera un objet dâun musĂ©e thĂ©matique, dâun musĂ©um, dâun CCSTI, dâun centre dâinterprĂ©tation⊠Cet objet qui a une histoire particuliĂšre au sein dâune collection ou qui pose une problĂ©matique inĂ©dite en terme de conservation, dâexposition, dâinterprĂ©tation, de rĂ©ception⊠sera choisi et commentĂ© par lâinstitution concernĂ©e. Serge LOCHOT, rĂ©dacteur en che