Letteratura scientifica selezionata sul tema "Sénothérapie"
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Articoli di riviste sul tema "Sénothérapie":
Veret, Damien, e Jean-Marc Brondello. "Sénothérapies". médecine/sciences 36, n. 12 (dicembre 2020): 1135–42. http://dx.doi.org/10.1051/medsci/2020220.
Veret, Damien, Christian Jorgensen e Jean-Marc Brondello. "L’arthrose à l’heure des sénothérapies". Revue du Rhumatisme 89, n. 1 (gennaio 2022): 8–10. http://dx.doi.org/10.1016/j.rhum.2021.09.009.
Veret, Damien, Christian Jorgensen e Jean-Marc Brondello. "L’arthrose à l’heure des sénothérapies". Revue du Rhumatisme 89, n. 1 (gennaio 2022): 8–10. http://dx.doi.org/10.1016/j.rhum.2021.09.009.
Tesi sul tema "Sénothérapie":
Çobanoglu, Özmen. "Contribution de la sénescence cellulaire à la vaccination anti-tumorale chez l’individu âgé". Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILS083.
Age-related decline of immunity reduces vaccine efficacy in the elderly. Cellular senescence - a hallmark of aging - is a physiological process characterized by a state of chronic low-grade inflammation. Senescent cells accumulate with age and are resistant to cell death as a result of increased Bcl-2 expression. Senescent cells show an enhanced pro-inflammatory phenotype, as a part of senescence associated secretory phenotype (SASP) which contributes to inflammation and other detrimental effects. Pre-existing senescent cells cause many aging-related disorders and therapeutic strategies aiming at selectively eliminating these cells have recently gained attention.The potential role of pre-existing senescent cells in vaccine efficacy in the aged populations has not yet been reported to our knowledge. This can be achieved through different approaches such as the use of senolytic drugs that selectively target and eliminate these cells. Using the specific Bcl-2 family inhibitor senolytic ABT-263 (Navitoclax), we investigated the effects of senolysis on the immune response induced by vaccination. To this end, aged mice (22-months) and young adult mice (2 months) were treated with Navitoclax before immunization and few days later mice were immunized with the antigen Ovalbumin (OVA) plus adjuvant (Quil-A and CpG ODN). Antibody production was quantified by ELISA and the T cell response was quantified by measuring the production of interferon gamma after antigen re-stimulation. To study the efficacy of the immune response post-vaccination, mice were engrafted with OVA-expressing B16 melanoma cells and melanoma outgrowth was measured.ABT-263 treatment depleted senescent cells in the spleen. This was evidenced by immunohistochemistry using antibodies against p16 (a marker of senescence) and Bcl-2 and by quantifying beta-galactosidase activity, another marker of senescence. Depletion of senescent cells also led to a reduced production of systemic SASP-related factors in blood. In the same line, splenocytes isolated from Navitoclax-treated aged mice produced less inflammatory cytokines in response to LPS compared to controls. Having validated the efficacy of Navitoclax, we then turned to analyze the consequences of senescent cell's removal on the immune, anti-tumor response. Navitoclax treatment slightly reduced antigen-specific antibody production. Both IgM and IgG were affected. In contrast, T cells from Navitoclax-treated aged mice produce more IFN-gamma compared to controls. A similar effect was observed in young adult mice. Strikingly, depletion of pre-existing senescent cells before vaccination abrogated the protective effect of the vaccine on tumor outgrowth in aged mice, and to a lower extent, in young adult mice. We conclude that senolysis influences the quality of the immune responses post-vaccination and strongly affects the anti-tumor response in vaccinated aged mice
Dotou-Huetz, Mazzarine. "Towards selective bifunctional senolytic compounds : design, mechanistic studies and proof of concept". Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS652.pdf.
Ageing is accompanied by a decline in the regenerative properties of most tissues, and the accumulation of senescent cells as we age is associated with this decline. Senescence is a cellular response due to telomere shortening or exposure to stresses causing an accumulation of DNA damage and/or oxidative stress. This cellular response is characterized by an irreversible cell cycle arrest, an increase in the β-galactosidase activity associated with senescence and the secretion of the Senescence-Associated Secretory Phenotype or SASP composed of cytokines, chemokines, growth factors and proteases. The composition of this SASP, and therefore its role, depends on the cell type and the nature of the senescence-inducing stress, and contributes to the deleterious effects of senescent cells. Among the tissues affected, skeletal muscle represents a paradigm for exploring regenerative strategies. Thanks to a population of muscle stem cells that can activate, proliferate and differentiate to form new myofibers, muscle has remarkable capacity for regeneration after injury. During the ageing process and muscular dystrophies, this potential is depleted as muscle stem cells gradually enter senescence. The development of senotherapy based on the use of senolytic compounds capable of eliminating senescent cells is therefore a promising strategy. However, the compounds currently available lack specificity. This thesis involved designing, synthesizing and evaluating for the first time two new types of innovative bifunctional compounds with optimized selectivity targeting DPP4, a membrane protease overexpressed on the surface of senescent cells. The first compound is characterized by a conjugation between a potent senolytic and a high-affinity ligand for DPP4, enabling molecular addressing. The second is additionally characterized by an immolative linker, sensitive to the senescence associated β-galactosidase activity, enabling specific release of the senolytic within senescent cells. These constructs were evaluated on different cell lines rendered senescent by various stresses and compared with reference senolytics and senormorphics. In conclusion, the bifunctional molecules developed during this thesis have a senolytic power similar to that of Piperlongumine, the parent senolytic agent used for design purposes, with improved selectivity towards non-senescent cells compared with reference senolytics such as Quercetin and Dasatinib. The mode of action of Piperlongumine was also studied in particular metabolism disruption, and intracellular targets. Hence, our data constitute an excellent basis to develop a new format of senomodulators with improved selectivity for muscle regeneration strategy purposes