Metagenomic Next Generation Sequencing (mNGS) allows the evaluation of complex microbial communities, avoiding isolation and cultivation of each microbial species, and does not require prior knowledge of the microbial sequences present in the sample. Applications of mNGS include virome characterization, new virus discovery and full-length viral genome reconstruction, either from virus preparations enriched in culture or directly from clinical and environmental specimens. Here, we systematically reviewed studies that describe novel virus identification through mNGS from samples of different origin (plant, animal and environment). Without imposing time limits to the search, 379 publications were identified that met the search parameters. Sample types, geographical origin, enrichment and nucleic acid extraction methods, sequencing platforms, bioinformatic analytical steps and identified viral families were described. The review highlights mNGS as a feasible method for novel virus discovery from samples of different origins, describes which kind of heterogeneous experimental and analytical protocols are currently used and provides useful information such as the different commercial kits used for the purification of nucleic acids and bioinformatics analytical pipelines.

Breast cancer includes tumor subgroups with morphological, molecular, and clinical differences. Intrinsic heterogeneity especially characterizes breast tumors with a triple negative phenotype, often leading to the failure of even the most advanced therapeutic strategies. To improve breast cancer treatment, the use of natural agents to integrate conventional therapies is the subject of ever-increasing attention. In this context, garlic (Allium sativum) shows anti-cancerous potential, interfering with the proliferation, motility, and malignant progression of both non-invasive and invasive breast tumor cells. As heterogeneity could be at the basis of variable effects, the main objective of our study was to evaluate the anti-tumoral activity of a garlic extract in breast cancer cells with a triple negative phenotype. Established triple negative breast cancer (TNBC) cell lines from patient-derived xenografts (PDXs) were used, revealing subtype-dependent effects on morphology, cell cycle, and invasive potential, correlated with the peculiar down-modulation of Akt signaling, a crucial regulator in solid tumors. Our results first demonstrate that the effects of garlic on TNBC breast cancer are not unique and suggest that only more precise knowledge of the mechanisms activated by this natural compound in each tumor will allow for the inclusion of garlic in personalized therapeutic approaches to breast cancer.

Type 1 diabetes (T1D) is a chronic autoimmune condition characterized by the destruction of pancreatic beta cells, recently estimated to affect approximately 8.75 million individuals worldwide. At variance with conventional management of T1D, which relies on exogenous insulin replacement and insulinotropic drugs, emerging therapeutic strategies include transplantation of insulin -producing cells (IPCs) derived from stem cells or fully reprogrammed differentiated cells. Through the in-depth analysis of the microRNAs (miRNAs) involved in the differentiation of human embryonic stem cells (ESCs), mesenchymal stem cells (MSCs), and induced pluripotent stem cells (iPSCs), into insulin -producing cells, this review provides a comprehensive overview of the molecular mechanisms orchestrating the transformation of precursors to cells producing insulin. In addition to miR-375, involved in all differentiation processes, and to miR-7, mir-145 and miR-9, common to the generation of insulin -producing cells from at least two different sources, the literature reveals panels of miRNAs closely related to precursor cells and associated with specific events of the physiological beta cell maturation. Since the forced modulation of miRNAs can direct cells development towards insulin -producing cells or modify their fate, a more comprehensive knowledge of the miRNAs involved in the cellular events leading to obtain efficient beta cells could improve the diagnostic, prognostic, and therapeutic approaches to diabetes.

Background/Objectives: Natural compounds are being increasingly explored as potential adjuvants to conventional drugs in oncological treatments. Regarding breast tumors, several studies indicate that garlic (Allium sativum) may protect against onset, counteracts aggressiveness, and prevents malignant progression of cells from non-invasive tumors. It has been widely demonstrated that garlic derivatives induce apoptosis and reduce invasive potential in ER-positive and triple-negative breast tumor cells. However, the current literature lacks studies investigating their effects on HER2-positive (HER2+) breast cancers. This study therefore aimed to explore the effects of a garlic extract and diallyl disulfide (DADS), one of its most bioactive organosulfur compounds, on HER2+ phenotype breast tumor cells. Methods: The effects of a garlic extract and diallyl disulfide (DADS) were investigated on MDA-MB-453 and SKBR3 breast tumor cell lines. Cell growth, invasive potential, and Akt-related signaling were assessed after 4–72 h of garlic derivatives administration. The intracellular localization of β-catenin was examined with immunofluorescent confocal microscopy. Results: A dual role of DADS, dependent on the duration of treatment, was revealed. Acute administration induced a significant decrease in invasive potential, while prolonged treatment promoted HER2+ cell invasiveness. These effects were directly correlated with the activation of Akt and the nuclear accumulation of β-catenin, known to induce expression of genes associated with tumor malignancy. Conclusions: Although further investigations are needed to establish the exact mechanism and to assess the in vivo reproducibility of these phenomena, our results highlight the heterogeneous response to natural compounds of complex diseases like cancer.

Background: MiRNAs within extracellular vesicles can encompass body barriers, reflecting stage, progression, and response to treatments of various diseases, including multiple sclerosis (MS)—a chronic immune-mediated disease of the central nervous system that causes progressive disability, with highly variable clinical courses. In this context, urinary exosomal miRNAs could be an appealing source of biomarkers, thanks to their non-invasive and easily repeatable collection. Methods: In this exploratory investigation, we tried to assess if profiling urinary exosomal miRNAs could reveal subtle differences within an apparently homogeneous MS population. The study involved 24 patients with primary or secondary progressive MS, whose urinary exosomes (UEs) were subjected to evaluation of a panel of 87 miRNAs variously correlated with neuroinflammation, cardiovascular functions, and/or involved in MS. Results: We revealed that the examined miRNAs were heterogeneously expressed across the patients, reflecting, as expected, their gender and/or hormonal status. Two miRNAs discriminated against primary or secondary progressive MS, and a panel of 14 commonly upmodulated miRNAs identified patients with longer disease duration and a greater degree of disability. Conclusions: Even if preliminary, these data represent the first relationship between UEs and MS features in humans and suggest that urine could constitute a non-invasive source of exosomal miRNAs, which could prove useful in complementing conventional monitoring to provide a more personalized management of MS patients.