Raffaella Mele

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Cell-mediated immunity during the muscular phase of Trichinella infection in humans was studied. Cell proliferation, the phenotypic changes in the T-cell population, and expression and production of cytokines were examined by using peripheral blood mononuclear cells (PBMC) collected at different times postinfection from 10 individuals who had acquired(More)
The use of highly active antiretroviral therapy in persons with acquired immunodeficiency syndrome has reduced the prevalence of infection with Cryptosporidium parvum and the length and severity of its clinical course. This effect has in most cases been attributed to the recovery of the host immunity; however, some works suggest that human immunodeficiency(More)
Hepatitis C virus (HCV) is the major causative viral agent of cirrhosis and hepatocarcinoma (HCC). HCV core protein affects cell homeostasis, playing an important role in viral pathogenesis of HCC. We investigate the effects of HCV core protein expression on cell growth in HCC cell lines. Cell cycle distribution analysis of HepG2 polyclonal core positive(More)
We studied apoptosis in a human ileocecal adenocarcinoma tumor cell line (HCT-8) infected with Cryptosporidium parvum, from 2 to 72 h postinfection (h.p.i.). At 2 h.p.i., the percentage of annexin V-positive cells in the cell culture had increased to 10% compared to 2.5% in noninfected control culture; sorted infected cells expressed mRNA of FasL, the(More)
The recombinant SA35 peptide has been described as an antigenic portion of a larger Cryptosporidium parvum protein. We identified and characterized the encoding Cpa135 gene and the entire protein, Cpa135. The Cpa135 gene was found to consist of a single exon of 4671 bp, and the mRNA transcribed in the sporozoites was identified. The predicted 1556(More)
System A-mediated amino acid transport, activation of different steps of signal transduction and involvement of different isoforms of protein kinase C (PKC) have been investigated in chick embryo hepatocytes after epidermal growth factor (EGF) stimulation. EGF rapidly (10 min) increased the rate of aminoisobutyric acid (AIB) uptake in chick embryo(More)
In this work, the proliferative activity of chick embryo hepatocytes and its regulation by factors affecting cell growth, such as epidermal growth factor (EGF) and retinoic acid, were studied. The transport of nutritional molecules, like amino acids, was also investigated; in particular, the uptake mediated by the Na+ -dependent system A, known to be under(More)
T-cell-mediated immunity plays a central role in the host response to Cryptosporidium parvum. Human T-cell clones (TCC) were isolated from peripheral blood mononuclear cells of five healthy donors with prior cryptosporidiosis by use of a C. parvum crude extract, two antigen fractions obtained by ion-exchange chromatography (IEC1 and IEC2), and two(More)
Type 1 diabetes (T1D) is an autoimmune disease, in which pancreatic beta cells are destroyed in genetically predisposed individuals. While the direct contribution of autoantibodies to the disease pathogenesis is controversial, it is generally recognised that the mechanism of beta cell destruction is mediated by autoreactive T cells that had escaped the(More)