31 research outputs found

    Expression of C-terminal deleted p53 isoforms in neuroblastoma

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    The tumor suppressor gene, p53, is rarely mutated in neuroblastomas (NB) at the time of diagnosis, but its dysfunction could result from a nonfunctional conformation or cytoplasmic sequestration of the wild-type p53 protein. However, p53 mutation, when it occurs, is found in NB tumors with drug resistance acquired over the course of chemotherapy. As yet, no study has been devoted to the function of the specific p53 mutants identified in NB cells. This study includes characterization and functional analysis of p53 expressed in eight cell lines: three wild-type cell lines and five cell lines harboring mutations. We identified two transcription-inactive p53 variants truncated in the C-terminus, one of which corresponded to the p53ÎČ isoform recently identified in normal tissue by Bourdon et al. [J. C. Bourdon, K. Fernandes, F. Murray-Zmijewski, G. Liu, A. Diot, D. P. Xirodimas, M. K. Saville and D. P. Lane (2005) Genes Dev., 19, 2122–2137]. Our results show, for the first time, that the p53ÎČ isoform is the only p53 species to be endogenously expressed in the human NB cell line SK-N-AS, suggesting that the C-terminus truncated p53 isoforms may play an important role in NB tumor development

    Taphonomic signature of Eurasian eagle owl (Bubo bubo) on fish remains

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    Magdalenian fishing: difficulty to identify a highly suspected behaviour

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    Was Neanderthal a fisherman?

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    Analyses sclĂ©rochronologiques d’écailles archĂ©ologiques d’ombres commun Thymallus thymallus et infĂ©rences sur la pĂȘche palĂ©olithique au Taillis des Coteaux (Vienne, France)

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    Lors des fouilles archĂ©ologiques du Taillis des Coteaux, plus de 791 Ă©cailles ont Ă©tĂ© mises au jour dans une zone attribuĂ©e chronologiquement au MagdalĂ©nien infĂ©rieur. L’origine (animale ou anthropique) des accumulations de poissons dans les sites archĂ©ologiques est souvent mĂ©connue. L’application de la sclĂ©rochronologie Ă  l’étude de ces restes nous permet non seulement d’avoir une estimation de l’ñge du poisson, mais aussi de prĂ©ciser la pĂ©riode de capture. La connaissance de la saison de mort des individus est un bon indicateur des activitĂ©s humaines et/ou d’autres prĂ©dateurs (carnivores, oiseaux). La majoritĂ© des Ă©cailles est attribuable aux salmonidae. Parmi les espĂšces identifiĂ©es, seul l’ombre commun Thymallus thymallus (L., 1758) est bien reprĂ©sentĂ©. Ses Ă©cailles sont les mieux prĂ©servĂ©es et ont permis de tester sur un Ă©chantillon (n=50) l’interprĂ©tation des marques de croissance de pĂ©riodicitĂ© annuelle. Une collection de rĂ©fĂ©rence actuelle (France, Suisse, Finlande) a Ă©tĂ© crĂ©Ă©e afin d’estimer le rythme de croissance de cette espĂšce et d’établir un modĂšle de rĂ©fĂ©rence pour comparer la croissance globale des ombres archĂ©ologiques. Notre protocole repose sur une sĂ©rie de mesures standardisĂ©es allant du foyer (ou focus) au bord externe de l’écaille, en passant par les diffĂ©rents annulii. L’estimation des Ăąges de nos individus archĂ©ologiques a aussi Ă©tĂ© rĂ©alisĂ©e. Les rĂ©sultats de l’étude nous ont permis de comparer la croissance des spĂ©cimens archĂ©ologiques avec celles de nos spĂ©cimens actuels et de mettre en Ă©vidence que la croissance des poissons du MagdalĂ©nien infĂ©rieur est trĂšs comparable Ă  celle des poissons actuels peuplant la France et la Suisse. De plus, la pĂ©riode « estivale » constitue une saison prĂ©fĂ©rentielle de capture pour les ombres communs au MagdalĂ©nien infĂ©rieur

    Was Neanderthal a fisherman?

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    Taphonomy of Yellow-legged Gull ( Larus michahellis ) pellets from the Chafarinas islands (Spain)

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    International audienceFish are consumed by many predators in addition to humans. Identifying the agent responsible for an archaeological fish bone accumulation is a crucial yet far from straightforward task in the absence of diagnostic criteria. It is for this reason that exploring the features of fish bone collections produced by animals constitutes a key issue of archaeozoological research. In this paper, one such study is presented for the Yellow-legged Gull (Larus michahellis J.F. Naumann, 1840). A total of 48 pellets were collected in a colony of the species on two islands of the Chafarinas archipelago (Mediterranean Sea). The analyses demonstrate that fish remains, represented by 13 species and 1 genus, made up 93% of the 2789 identified remains. Most assemblages were dominated by the European pilchard (Sardina pilchardus (Walbaum, 1792)). Our study indicates that digestive processes modify skeletal elements through abrasion and fragmentation. Based on the modifications that were recorded, a set of diagnostic criteria is proposed to serve as proxies for spotting fish bone deposits produced by Yellow-legged Gulls on archaeological assemblages

    Sur un poisson gravé magdalénien de la grotte Margot (Thorigné-en-Charnie, Mayenne) [On a Magdalenian engraved fish in the Margot cave (Thorigne-en-Charnie, Mayenne, France)]

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    National audienceAn engraved fish that can be attributed to the final Magdalenian period was discovered in 2010 in the Margot cave (Thorigne-en-Charnie, Mayenne, France). It shows graphic details that allow us to propose some clues to taxonomic determination. It must be a freshwater fish; the hypothesis of a Cyprinidae such as a tench is acceptable, considering that the 3.1 layer of the nearby Rochefort cave, attributable to the Final Paleolithic, has yielded a branchial arch of another Cyprinidae (probably a chub or a dace). Fish is not a usual theme in Paleolithic wall art. Here it is associated with another engraved animal figure, which is not fully determinable (seal or other fish). (C) 2014 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved
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