34 research outputs found
Ku counteracts mobilization of PARP1 and MRN in chromatin damaged with DNA double-strand breaks
In mammalian cells, the main pathway for DNA double-strand breaks (DSBs) repair is classical non-homologous end joining (C-NHEJ). An alternative or back-up NHEJ (B-NHEJ) pathway has emerged which operates preferentially under C-NHEJ defective conditions. Although B-NHEJ appears particularly relevant to genomic instability associated with cancer, its components and regulation are still largely unknown. To get insights into this pathway, we have knocked-down Ku, the main contributor to C-NHEJ. Thus, models of human cell lines have been engineered in which the expression of Ku70/80 heterodimer can be significantly lowered by the conditional induction of a shRNA against Ku70. On Ku reduction in cells, resulting NHEJ competent protein extracts showed a shift from C- to B-NHEJ that could be reversed by addition of purified Ku protein. Using a cellular fractionation protocol after treatment with a strong DSBs inducer followed by western blotting or immunostaining, we established that, among C-NHEJ factors, Ku is the main counteracting factor against mobilization of PARP1 and the MRN complex to damaged chromatin. In addition, Ku limits PAR synthesis and single-stranded DNA production in response to DSBs. These data support the involvement of PARP1 and the MRN proteins in the B-NHEJ route for the repair of DNA DSBs
Quelques motifs de la psychanalyse.: Ă partir des travaux de Laurence Kahn.
International audienceĂ lâheure oĂč lâon prĂ©dit la fin imminente de la psychanalyse â prĂ©diction qui accompagnala dĂ©couverte freudienne dĂšs son origine â, que signifie de sâinterroger sur ses « motifs » ? Est-il exact que ses outils de pensĂ©e soient si obsolĂštes quâil faille remanier ses thĂ©ories et sa pratique pour mieux lâadapter ? Dans un temps oĂč les ralliements hĂątifs vont Ă la supposĂ©e modernisation, gage dâouverture, quâadvient-il du temps long et de la complexitĂ© requis pour sâacquitter aussi bien de la tĂąche thĂ©rapeutique que de la rĂ©flexion sur les crĂ©ations culturelles et sur leurs butĂ©es actuelles ?Câest Ă partir des travaux de Laurence Kahn, membre de lâAssociation psychanalytique de France, que ces questions ont Ă©tĂ© abordĂ©es au cours dâun colloque organisĂ© au Centre culturel international de Cerisy. Des travaux qui, depuis sa formation initiale dâhellĂ©niste dans le laboratoire de Jean-Pierre Vernant jusquâĂ sa pratique dâanalyste auprĂšs des adultes et des enfants, lâont rĂ©guliĂšrement conduite Ă associer Ă sa rĂ©flexion sur le legs freudien les Ćuvres de la philosophie, de la sociologie politique, de la littĂ©rature et de lâhistoire.Des anthropologues, des philosophes, des psychanalystes ont ainsi acceptĂ© dâexploreravec elle le moteur pulsionnel et conflictuel qui anime la vie psychique individuelle, fait le terreau de la vie collective, agite et bouleverse les Ă©quilibres et les dĂ©dommagements qui se trament entre nos solitudes et nos devenirs dâĂȘtres sociables. De lâusage de la parole Ă lâĂ©coute de lâanalyste, de lâefficacitĂ© du mythe Ă lâengendrement paradoxal de la barbarie par la civilisation mĂȘme, de la psychanalyse des enfants aux problĂšmes soulevĂ©s par les demandes de changement de sexe ou par le rituel de lâĂ©chographie et sa violence, il y va chaque fois des chocs entre lâaction muette de la rĂ©pĂ©tition et les formes sensibles de ses mĂ©tamorphoses.Comment traduire ces heurts si ce nâest en faisant usage de la mĂ©tapsychologie, câest-Ă -dire en interrogeant lâasymĂ©trie constitutive entre les qualitĂ©s du « ĂȘtre affectĂ© » et lâĂ©conomie des quantitĂ©s Ă©nergĂ©tiques ?Ce volume rassemble les communications prononcĂ©es et les rĂ©sumĂ©s des dĂ©bats nourris qui ont eu lieu Ă leur suite
Mauvaises herbes du maïs: 25 ans d'évolution dans les grandes régions de production
National audienc
A Comparative Study of Shyamatrivruttadi Kalka and Bruhatiphala-Dwiharidra Kalka Yonipuran in Kaphaja Yonivyapad
Introduction: A healthy woman is a promise of healthy family. The concept of healthy yoni has been asserted in various phase of womanĂąâŹâąs life from puberty to marriage to child birth and thereafter. Due to change in lifestyle, modern food habits of fast food, junk food she is unable to follow the rules of Dincharya, Rutucharya, Rajaswala, Rutumati and Sutikaparicharya which are explained by Aacharyas for womenĂąâŹâąs health. Thus she is prone to various yonirogas, one of which is Yonigat Shewta-Picchilsrava, Yonikandu, Yonigata Alpa vedana which are the features of Kaphaja yonivyapada and is neglected by women as minor symptoms. Aims and Objectives: 1.To evaluate the efficacy of Shyamatrivruttadi kalka in kaphajaĂ Yonivyapad & Bruhatiphala-Dwiharidra kalka in kaphajaĂ yonivyapad. Materials and Methods: The female patients within 18 to 45 years of age group complaining mainly of kaphaja yonivyapad were selected irrespective of occupation, religion and prakruti. Conclusion: Most of the patients in experimental group showed better relief in sign symptoms as compared to the control group, it is obvious from the all analysis of data that the drug in experimental group had definitely better role than control group to alleviate clinical features in Kaphaj yonivyapad