Добірка наукової літератури з теми "Facteurs diffusibles"
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Дисертації з теми "Facteurs diffusibles":
Haghighi, Rad Farhad. "Modulation de l'angiogenèse tumorale par les progéniteurs endothéliaux circulants et des facteurs diffusibles." Paris 11, 2007. http://www.theses.fr/2007PA11T033.
Agasse, Fabienne. "Modulation par facteurs diffusibles cérébraux de la neurogenèse dans des cultures de cellules de zone sous-ventriculaire (SVZ) de rat." Poitiers, 2005. http://www.theses.fr/2005POIT2255.
The subventricular zone (SVZ) of the adult mammalian brain harbors neural stem cells that generate neurons throughout life. This study examines whether diffusible factors released by cerebral tissues modulate neurogenesis in SVZ cell cultures from rat. We incubated SVZ cell cultures with factors delivered by various cerebral tissues and investigated the effects on the different aspects of neurogenesis. We demonstrated that adult cortex factors limit proliferation and neuronal differentiation without affecting cell survival. Adult SVZ factors promote proliferation, cell survival and neuronal differentiation. Factors delivered by cortex explant treated with staurosporine - an inducer of apoptosis that mimics the effect of a cortical injury – stimulate proliferation and neuronal differentiation. Cortex factors from embryonic and early postnatal brains differentially modulate neurogenesis : proliferation is enhanced with E16 and E13 cortex, neuronal differentiation and cell survival are promoted with E16 cortex factors. Cortex factors from newborn brain do not affect the development of SVZ cultures. Factors delivered by the various cortex tissues are heat-labile, suggesting that they are proteins. Identifying these factors is of great interest to develop new brain repair strategies based upon SVZ cell transplantation
Kosuta, Sonja. "Des facteurs diffusibles, produits par les champignons mycorhiziens à arbuscules, induisent des réponses symbiotiques au niveau des racines de Medicago truncatula." Toulouse 3, 2003. http://www.theses.fr/2003TOU30029.
GERARD, NADINE. "Etudes in vitro de la regulation des cellules de sertoli par les cellules germinales chez le rat : implication de facteurs diffusibles, des contacts cellulaires et des corps residuels." Rennes 1, 1992. http://www.theses.fr/1992REN10110.
Mourtada, Jana. "Mécanismes d’activation de la réponse immunitaire par DNp63 dans les cancers des voies aérodigestives supérieures HPV-positifs." Electronic Thesis or Diss., Strasbourg, 2023. http://www.theses.fr/2023STRAJ127.
HPV+ oropharyngeal tumors display both prognostic and molecular heterogeneity. Patients prognosis can be distinguished by the presence or absence of a molecular signature that depends on the ΔNp63 transcription factor. We demonstrated that ΔNp63 inhibits the migratory and invasive capabilities of HPV+ HNSCC cell lines and increases their sensitivity to platinum-based chemotherapy, implying its role in tumor progression. A functional analysis of ΔNp63 revealed its ability to stimulate the phagocytosis of cancer cells by macrophages in vitro. Consistently, a transcriptomic analysis of the same cellular model highlighted that ΔNp63 regulates the expression of secreted factors, including chemokines and interleukins, among which is the DKK3protein. Our findings indicate that DKK3 secretion by cancer cells activates the NF-κB pathway in macrophages, mimicking ΔNp63's effects on phagocytosis regulation. Induction of the NF-κB pathway by DKK3 in macrophages is mediated by its receptor CKAP4. Finally, our analyses suggest that ∆Np63 regulates the expression of factors involved in the inflammasome, as well as those of other cytokines such as TNFRSF11B, CCL26, CCL11, TIMP1 and TIMP2. Altogether, our results show that ΔNp63 plays a unique role in the prognosis of HPV+ patients by regulating secreted molecules involved in the recruitment and immune cell activation
Yao, Haiqin. "Regulation of gametophyte-to-sporophyte transitions during the file cycle of Ectocarpus." Electronic Thesis or Diss., Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2019SORUS424.pdf.
Most eukaryotic organisms reproduce sexually and have life cycles that involve an alternation between haploid and diploid phases due to two fundamental processes meiotic cell division (at the diploid-to-haploid transition) and gametes fusion or syngamy (haploid-to-diploid transition). In photosynthetic organisms with haploid-diploid life cycles, these alternations are between two distinct multicellular generations: gametophyte and sporophyte. As both the gametophyte and sporophyte generations are constructed using information from a shared genome, it follows that epigenetic regulation processes must operate both during meiosis and during syngamy to trigger the initiation of the appropriate developmental program associated with each generation. Genetic analysis of life cycle alternation in organisms diversely distribute across the lineages of the eukaryotic tree will improve our understanding at the molecular level. Current knowledge indicates that life cycle alternation is regulated by genetic factors (homeodomain transcription factors) and by chromatin modifications. The majority of brown algae have haploid-diploid life cycle and one of these species, the filamentous brown alga Ectocarpus, is being used as a model system to study life cycle regulation. Ectocarpus has a complex life cycle. Current work has shown that alternation of generations in Ectocarpus is controlled by two homeodomain transcription factors, ORO and SAM, which regulate the induction of the sporophyte developmental program. However, alternation between the gametophyte and the sporophyte can also be regulated by a non-cell autonomous, sporophyte-inducing factor secreted into the culture media by sporophytes. This diffusible factor causes major developmental reprogramming in initial cells (meio-spores) of the gametophyte. Interestingly, current work shows that ORO and SAM may be part of the regulatory network triggered by the sporophyte-inducing factor. However, the biochemical nature of this factor is not known. The main objective of this thesis was to characterize the diffusible sporophyte-inducing factor. The work focused on optimizing production, storage and bioassay of the factor and on obtaining information about its biochemical nature. The study also investigated the relationship between the sporophyte-inducing factor and two genetic regulators, ORO and SAM, to understand the developmental pathway triggered by the factor. In addition to this work on life cycle generation identity, the thesis involved characterisation of the baseless mutant, which exhibits a similar phenotype to the distag mutant and is affected in developmental patterning during both the gametophyte and sporophyte generations
Poirier, Véronique. "Manipulation expérimentale des progéniteurs neuronaux de la crête neurale de mammifère." Cachan, Ecole normale supérieure, 1994. http://www.theses.fr/1994DENS0011.