116 research outputs found
Oltre la pandemia: riscrivere il mondo con Paulo Freire
I dati relativi allâinfezione da coronavirus SARS-CoV-2 mostrano come la pandemia di Covid-19 abbia profondamente inciso, a livello mondiale, nellasanitĂ , nelle societĂ , nelle economie, modificando radicalmente le abitudini e gli stili di vita, le modalitĂ relazionali e comunicative di tutte le persone. Lapandemia e il confinamento hanno avuto un profondo impatto anche sulle istituzioni scolastiche e sui percorsi formativi di studenti, studentesse comesui docenti di tutti i gradi scolastici. Al pari di una forma di oppressione, la pandemia ha rivelato ingiustizie e disuguaglianze, rapporti di potere e dominio,evidenziando pure la necessitĂ di pensare allâeducazione come a una pratica in grado di restaurare libertĂ e democrazia e di ripristinare autonomiadâessere delle persone. Questo articolo sostiene lâattualitĂ della lezione educativa di Paulo Freire, indicandola quale modalitĂ di uscita dalla pandemia.La lettura delle opere di Freire mostra che, coltivando solidarietĂ e speranza, Ăš possibile ridisegnare le pratiche formative e didattiche in quantoprogetto politico di umanitĂ
Toxicological Impact of Rare Earth Elements (REEs) on the Reproduction and Development of Aquatic Organisms Using Sea Urchins as Biological Models
The growing presence of lanthanides in the environment has drawn the attention of the scientific community on their safety and toxicity. The sources of lanthanides in the environment include diagnostic medicine, electronic devices, permanent magnets, etc. Their exponential use and the poor management of waste disposal raise serious concerns about the quality and safety of the ecosystems at a global level. This review focused on the impact of lanthanides in marine organisms on reproductive fitness, fertilization and embryonic development, using the sea urchin as a biological model system. Scientific evidence shows that exposure to lanthanides triggers a wide variety of toxic insults, including reproductive performance, fertilization, redox metabolism, embryogenesis, and regulation of embryonic gene expression. This was thoroughly demonstrated for gadolinium, the most widely used lanthanide in diagnostic medicine, whose uptake in sea urchin embryos occurs in a time- and concentration-dependent manner, correlates with decreased calcium absorption and primarily affects skeletal growth, with incorrect regulation of the skeletal gene regulatory network. The results collected on sea urchin embryos demonstrate a variable sensitivity of the early life stages of different species, highlighting the importance of testing the effects of pollution in different species. The accumulation of lanthanides and their emerging negative effects make risk assessment and consequent legislative intervention on their disposal mandatory
Novel insights into DNA methylation features in spermatozoa: stability and peculiarities
Data about the entire sperm DNA methylome are limited to two sperm donors whereas studies dealing with a greater number of subjects focused only on a few genes or were based on low resolution arrays. This implies that information about what we can consider as a normal sperm DNA methylome and whether it is stable among different normozoospermic individuals is still missing. The definition of the DNA methylation profile of normozoospermic men, the entity of inter-individual variability and the epigenetic characterization of quality-fractioned sperm subpopulations in the same subject (intra-individual variability) are relevant for a better understanding of pathological conditions. We addressed these questions by using the high resolution Infinium 450K methylation array and compared normal sperm DNA methylomes against somatic and cancer cells. Our study, based on the largest number of subjects (nâ=â8) ever considered for such a large number of CpGs (nâ=â487,517), provided clear evidence for i) a highly conserved DNA methylation profile among normozoospermic subjects; ii) a stable sperm DNA methylation pattern in different quality-fractioned sperm populations of the same individual. The latter finding is particularly relevant if we consider that different quality fractioned sperm subpopulations show differences in their structural features, metabolic and genomic profiles. We demonstrate, for the first time, that DNA methylation in normozoospermic men remains highly uniform regardless the quality of sperm subpopulations. In addition, our analysis provided both confirmatory and novel data concerning the sperm DNA methylome, including its peculiar features in respect to somatic and cancer cells. Our description about a highly polarized sperm DNA methylation profile, the clearly distinct genomic and functional organization of hypo- versus hypermethylated loci as well as the association of histone-enriched hypomethylated loci with embryonic development, which we now extended also to hypomethylated piRNAs-linked genes, provides solid basis for future basic and clinical research
SERS Quantification of Galunisertib Delivery in Colorectal Cancer Cells by Plasmonic-Assisted Diatomite Nanoparticles
AbstractThe small molecule Galunisertib (LY2157299, LY) shows multiple anticancer activities blocking the transforming growth factorâÎČ1 receptor, responsible for the epithelialâtoâmesenchymal transition (EMT) by which colorectal cancer (CRC) cells acquire migratory and metastatic capacities. However, frequent dosing of LY can produce highly toxic metabolites. Alternative strategies to reduce drug side effects can rely on nanoscale drug delivery systems that have led to a medical revolution in the treatment of cancer, improving drug efficacy and lowering drug toxicity. Here, a hybrid nanosystem (DNPâAuNPsâLY@Gel) made of a porous diatomite nanoparticle decorated with plasmonic gold nanoparticles, in which LY is retained by a gelatin shell, is proposed. The multifunctional capability of the nanosystem is demonstrated by investigating the efficient LY delivery, the enhanced EMT reversion in CRCs and the intracellular quantification of drug release with a subâfemtogram resolution by surfaceâenhanced Raman spectroscopy (SERS). The LY release trigger is the pH sensitivity of the gelatin shell to the CRC acidic microenvironment. The drug release is realâtime monitored at singleâcell level by analyzing the SERS signals of LY in CRC cells. The higher efficiency of LY delivered by the DNPâAuNPsâLY@Gel complex paves the way to an alternative strategy for lowering drug dosing and consequent side effects
Metabolic Pathways as a Novel Landscape in Pancreatic Ductal Adenocarcinoma
Metabolism plays a fundamental role in both human physiology and pathology, including
pancreatic ductal adenocarcinoma (PDAC) and other tumors. Anabolic and catabolic processes do
not only have energetic implications but are tightly associated with other cellular activities, such as
DNA duplication, redox reactions, and cell homeostasis. PDAC displays a marked metabolic phenotype
and the observed reduction in tumor growth induced by calorie restriction with in vivo
models supports the crucial role of metabolism in this cancer type. The aggressiveness of PDAC
might, therefore, be reduced by interventions on bioenergetic circuits. In this review, we describe
the main metabolic mechanisms involved in PDAC growth and the biological features that may
favor its onset and progression within an immunometabolic context. We also discuss the need to
bridge the gap between basic research and clinical practice in order to offer alternative therapeutic
approaches for PDAC patients in the more immediate future
âCoVidentaryâ: An online exercise training program to reduce sedentary behaviours in children with type 1 diabetes during the COVID-19 pandemic
Actin remodeling driven by circLIMA1: sperm cell as an intriguing cellular model
CircRNA cargo in spermatozoa (SPZ) participates in setting cell quality, in terms of morphology and motility. Cannabinoid receptor CB1 activity is correlated with a proper spermatogenesis and epididymal sperm maturation. Despite CB1 promotes endogenous skill to circularize mRNAs in SPZ, few notions are reported regarding the functional link between endocannabinoids and spermatic circRNA cargo. In CB1 knock-out male mice, we performed a complete dataset of spermatic circRNA content by microarray strategy. Differentially expressed (DE)-circRNAs, as a function of genotype, were identified. Within DE-circRNAs, we focused the attention on circLIMA1, as putative actin-cytoskeleton architecture regulator. The validation of circLIMA1 dependent-competitive endogenous RNA (ceRNA) network (ceRNET) in in vitro cell line confirmed its activity in the regulation of the cytoskeletal actin. Interestingly, a dynamic actin regulation in SPZ nuclei was found during their epididymal maturation. In this scenario, we showed for the first time an intriguing sperm nuclear actin remodeling, regulated via a ceRNET-independent pathway, consisting in the nuclear shuttling of circLIMA1-QKI interactome and downstream in Gelsolin regulation. In particular, the increased levels of circLIMA1 in CB1 knock-out SPZ, associated with an inefficient depolymerization of nuclear actin, specifically illustrate how endocannabinoids, by regulating circRNA cargo, may contribute to sperm morpho-cellular maturation
Impact of circulating tumor DNA mutant allele fraction on prognosis in RASâmutant metastatic colorectal cancer
Metastatic colorectal cancer; RAS analysis; Prognostic biomarkerCĂĄncer colorrectal en metĂĄstasis; AnĂĄlisis RAS; Biomarcador como pronĂłsticoCĂ ncer colorectal en metĂ stasi; AnĂ lisi RAS; Biomarcador com a pronĂČsticDespite major advances in the treatment of metastatic colorectal cancer (mCRC), the survival rate remains very poor. This study aims at exploring the prognostic value of RASâmutant allele fraction (MAF) in plasma in mCRC. Fortyâseven plasma samples from 37 RASâmutated patients with nonresectable metastases were tested for RAS in circulating tumor DNA using BEAMing before firstâ and/or secondâline treatment. RAS MAF was correlated with several clinical parameters (number of metastatic sites, hepatic volume, carcinoembryonic antigen, CA19â9 levels, primary site location, and treatment line) and clinical outcome [progressionâfree survival (PFS) and overall survival (OS)]. An independent cohort of 32 patients from the CAPRIâGOIM trial was assessed for clinical outcome based on plasma baseline MAF. RAS MAF analysis at baseline revealed a significant correlation with longer OS [Hazard ratios (HR) = 3.514; P = 0.00066]. Patients with lower MAF also showed a tendency to longer PFS, although not statistically significant. Multivariate analysis showed RAS MAFs as an independent prognostic factor in both OS (HR = 2.73; P = 0.006) and firstâline PFS (HR = 3.74; P = 0.049). Tumor response to treatment in patients with higher MAF was progression disease (P = 0.007). Patients with low MAFs at baseline in the CAPRIâGOIM group also showed better OS [HR = 3.84; 95% confidence intervals (CI) 1.5â9.6; P = 0.004] and better PFS (HR = 2.5; 95% CI: 1.07â5.62; P = 0.033). This minimally invasive test may help in adding an independent factor to better estimate outcomes before initiating treatment. Further prospective studies using MAF as a stratification factor could further validate its utility in clinical practice.This work was supported partially by the Instituto de Salud Carlos III (Ministerio de Economia y Competitividad) and `Fondo Europeo de Desarrollo Regional (FEDER), una manera de hacer Europa' grants [FIS PI12-01589 to RS] and RETICC Cancer
Impact of circulating tumor DNA mutant allele fraction on prognosis in RAS-mutant metastatic colorectal cancer
Despite major advances in the treatment of metastatic colorectal cancer (mCRC), the survival rate remains very poor. This study aims at exploring the prognostic value of RAS-mutant allele fraction (MAF) in plasma in mCRC. Forty-seven plasma samples from 37 RAS-mutated patients with nonresectable metastases were tested for RAS in circulating tumor DNA using BEAMing before first- and/or second-line treatment. RAS MAF was correlated with several clinical parameters (number of metastatic sites, hepatic volume, carcinoembryonic antigen, CA19-9 levels, primary site location, and treatment line) and clinical outcome [progression-free survival (PFS) and overall survival (OS)]. An independent cohort of 32 patients from the CAPRI-GOIM trial was assessed for clinical outcome based on plasma baseline MAF. RAS MAF analysis at baseline revealed a significant correlation with longer OS [Hazard ratios (HR) = 3.514; P = 0.00066]. Patients with lower MAF also showed a tendency to longer PFS, although not statistically significant. Multivariate analysis showed RAS MAFs as an independent prognostic factor in both OS (HR = 2.73; P = 0.006) and first-line PFS (HR = 3.74; P = 0.049). Tumor response to treatment in patients with higher MAF was progression disease (P = 0.007). Patients with low MAFs at baseline in the CAPRI-GOIM group also showed better OS [HR = 3.84; 95% confidence intervals (CI) 1.5-9.6; P = 0.004] and better PFS (HR = 2.5; 95% CI: 1.07-5.62; P = 0.033). This minimally invasive test may help in adding an independent factor to better estimate outcomes before initiating treatment. Further prospective studies using MAF as a stratification factor could further validate its utility in clinical practice
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