Cristina Leoni

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Organophosphorothionates (OPT) are one of the most widely used insecticides in the world, both in agriculture and in indoor environment. Therefore, a large part of the population may be exposed to this class of pesticides, either professionally or due to their presence in food and water as residues. OPTs acute toxic effects, mediated by acetylcholinesterase(More)
DNA methylation and specifically the DNA methyltransferase enzyme DNMT3A are involved in the pathogenesis of a variety of hematological diseases and in regulating the function of immune cells. Although altered DNA methylation patterns and mutations in DNMT3A correlate with mast cell proliferative disorders in humans, the role of DNA methylation in mast cell(More)
Dioxygenases of the TET family impact genome functions by converting 5-methylcytosine (5mC) in DNA to 5-hydroxymethylcytosine (5hmC). Here, we identified TET2 as a crucial regulator of mast cell differentiation and proliferation. In the absence of TET2, mast cells showed disrupted gene expression and altered genome-wide 5hmC deposition, especially at(More)
T helper (TH) cell polarization during priming is modulated by a number of signals, but whether polarization to a given phenotype also influences recall responses of memory TH cells is relatively unknown. Here we show that miR-181a is selectively induced in both human and mouse naive T cells differentiating into the TH17, but not TH1 or TH2 subset. In human(More)
OBJECTIVE As disruption of epigenetic control is a frequent event in solid tumors and leukemia, we investigated changes in DNA methylation (5mC) and hydroxymethylation (5hmC) in patients with systemic mastocytosis (SM), a rare myeloproliferative disease with a wide spectrum of severity, characterized by the accumulation of mast cells in various organs. (More)
The risk of developing autoimmune diseases depends on both genetic and environmental factors, with epigenetic mechanisms of regulation potentially translating environmental cues into stable modifications in gene expression. Such stable memory of a functional state has been deciphered into a number of molecular mechanisms that collectively define the(More)
We identified two mast cell subsets characterized by the differential expression of surface CD25 (IL-2Rα) and by different abilities to produce cytokines and to proliferate, both in vitro and in vivo. CD25 can be expressed on the surface of immune cells in the absence of the other chains of the IL-2R, which are indispensable for IL-2 signaling. We show that(More)
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