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Publications (7)21.02 Total impact

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    ABSTRACT: Adenosine deaminase is a polymorphic enzyme that has an important role in immune functions and in the regulation of intracellular and extracellular concentrations of adenosine and adenosine receptor activity. To search for possible association of type 1 diabetes mellitus (DM1) with three loci haplotypes (ADA1, ADA2, ADA6) of the adenosine deaminase gene. One hundred and eighty-nine consecutive children with DM1 from Sassari, Sardinia, and a control sample of 239 children from the same area were studied. ADA loci genotypes were determined by DNA analysis. Compared to controls, diabetic boys show a decrease of the 2(2)/6(1) haplotype while diabetic girls show an increase of the same haplotype. This association was replicated in an independent sample from Continental Italy. The 2(2)/6(1) haplotype may exert a protective action in males but may increase susceptibility to DM1 in females: OR = 0.398, 95% CI 0.16-0.96 for males, and OR = 2.31, 95% CI 1.32-4.06 for females.
    Journal of pediatric endocrinology & metabolism: JPEM 03/2010; 23(3):283-90. · 0.75 Impact Factor
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    ABSTRACT: ACP1 (acid phosphatase locus 1, a cytosolic low-molecular-weight phosphotyrosin phosphatase) and ADA1 (adenosine deaminase locus 1) are two polymorphic systems involved in immune reactions. Observed interactions at the biochemical and clinical levels between the two systems prompted this investigation of a possible interaction concerning susceptibility to type 1 diabetes. Two hundred eighty-seven children admitted consecutively to the hospital for type 1 diabetes and 727 healthy newborn infants were studied. All were from the Caucasian Italian population living in the central area of Italy. ACP1 and ADA1 genotypes were determined by DNA analysis. In the type 1 diabetics the distribution of ACP1 genotypes was dependent on the ADA1 genotypes, showing an excess of the low-activity *A/*A and *A/*B genotypes in the ADA1*2 carriers compared with the ADA1*1/*1 subjects (OR: 2.200, 95%CI: 1.133-4.298). Such an association was not present in the healthy newborn infants. This investigation based on the biological effects of ACP1 and ADA1 on the immune system and on the known biochemical interaction between the two systems showed a significant interaction between the two system concerning susceptibility to type 1 diabetes. The low-activity ACP1 genotypes *A/*A and *A/*B carrying the low-activity ADA1*2 allele were more common in type 1 diabetic than in healthy newborns (OR: 1.699 95%CI: 1.066-2.702).
    Medical science monitor: international medical journal of experimental and clinical research 10/2009; 15(10):CR511-517. · 1.22 Impact Factor
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    ABSTRACT: Assuming an immune component in the pathogenesis of atherosclerosis, we have investigated a possible association between coronary artery disease (CAD) and the acid phosphatase locus 1 (ACP1) genetic polymorphism, which has previously been found to be associated with immune disorders. 226 subjects admitted to the hospital for CAD, 358 consecutive newborn infants, 279 adult subjects with type 2 diabetes without CAD and 137 adults without diabetes and without CAD from the Caucasian population of Rome were studied. The ACP1 genotype was determined by DNA analysis. Statistical analyses were performed using the SPSS package. CAD females showed an excess of ACP1 *A/*C and *B/*C genotypes and a deficiency of ACP1 *B/*B genotype compared to controls, while CAD males did not show significant differences. Among diabetic women the proportion of *C allele carriers was much greater in those with CAD than in those without CAD. This difference was much less evident in nondiabetic women. ACP1 may be involved in susceptibility to CAD. Since ACP1 has been found to be associated with immunological diseases, our observation reinforces the notion of an immune component in the pathogenesis of atherosclerosis.
    Cardiology 03/2009; 113(4):236-42. · 1.52 Impact Factor
  • Cardiology 07/2008; 112(1):74-5. · 1.52 Impact Factor
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    ABSTRACT: In this paper we report the fabrication of a multivalent, cell-type specific and cytoplasmic delivery system based on single-walled carbon nanotubes. The latter were functionalized through adsorption of phospholipids terminated by biotinylated PEG chains functionalized with fluorochrome-coupled neutravidin, and subsequently with antibodies (anti-CD3ε and anti-CD28) for T cell receptor post-signaling endocytosis and a synthetic fusogenic polymer for disruption of lysosomal compartments. The biomimetic nanoassemblies were composed by PEGylated individual/very small bundles of carbon nanotubes having an average length and a standard deviation of 176 nm and 77 nm, respectively. The nanoassemblies were stably dispersed under physiological conditions, visible by conventional optical and confocal microscopy and specifically targeted to T cells both in vitro and in living animals. The addition of a fusogenic polymer to the nanoassemblies did not affect the cellular uptake and allowed the release into the cytosol of the targeted cells both in vitro and in the animals. The present manuscript is the first report about the cytoplasmic delivery of carbon nanotubes in a specific cell type in intact animals and paves the way for their use as in vivo intracellular delivery systems.
    Journal of Nanoscience and Nanotechnology 04/2008; 8(5):2259-2269. · 1.15 Impact Factor
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    ABSTRACT: We report the fabrication and characterization of neutravidin-conjugated silica nanobeads doped with a ruthenium-complex luminophore and functionalized with antihuman CD3, antihuman CD28, and an acid-sensitive polymer. We observed that the nanobeads were readily delivered into Jurkat T leukemia cells by endocytosis, transported into lysosomes and subsequently into the cytoplasm as revealed by pH-sensitive luminescence. Since signs of cytotoxicity were not observed, the reported nanobeads could be an excellent and nontoxic building block for efficient intracellular transporters.
    Journal of the American Chemical Society 07/2007; 129(25):7814-23. · 10.68 Impact Factor
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    ABSTRACT: To enhance diagnostic or therapeutic efficacy, novel nanomaterials must be engineered to function in biologically relevant environments, be visible by conventional fluorescent microscopy, and have multivalent loading capacity for easy detection or effective drug delivery. Here we report the fabrication of silica nanoparticles doped with quantum dots and superficially functionalized with amino and phosphonate groups. The amino groups were acylated with a water-soluble biotin-labeling reagent. The biotinylated nanoparticles were subsequently decorated with neutravidin by exploiting the strong affinity between neutravidin and biotin. The resultant neutravidin-decorated fluorescent silica nanoparticles stably dispersed under physiological conditions, were visible by conventional optical and confocal fluorescent microscopy, and could be further functionalized with macromolecules, nucleic acids, and polymers. We also coated the surface of the nanoparticles with biotinylated mouse anti-human CD3 (alphaCD3). The resultant fluorescent nanoassembly was taken up by Jurkat T cells through receptor-mediated endocytosis and was partially released to lysosomes. Thus, quantum dot-doped silica nanoparticles decorated with neutravidin represent a potentially excellent scaffold for constructing specific intracellular nanoprobes and transporters.
    International Journal of Nanomedicine 02/2007; 2(2):227-33. · 4.20 Impact Factor