Anna Teresa Palatucci

Università degli Studi della Basilicata, Potenza, Basilicate, Italy

Are you Anna Teresa Palatucci?

Claim your profile

Publications (8)18.23 Total impact

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Antibiotics are widely used in zoo technical and veterinary practices as feed supplementation to ensure wellness of farmed animals and livestock. Several evidences have been suggesting both the toxic role for tetracyclines, particularly for oxytetracycline (OTC). This potential toxicity appears of great relevance for human nutrition and for domestic animals. This study aimed to extend the evaluation of such toxicity. The biologic impact of the drug was assessed by evaluating the proinflammatory effect of OTC and their bone residues on cytokine secretion by in vitro human peripheral blood lymphocytes. Our results showed that both OTC and OTC-bone residues significantly induced the T lymphocyte and non-T cell secretion of interferon (IFN)-γ, as cytokine involved in inflammatory responses in humans as well as in animals. These results may suggest a possible implication for new potential human and animal health risks depending on the entry of tetracyclines in the food-processing chain.
    Journal of Biochemical and Molecular Toxicology 11/2015; DOI:10.1002/jbt.21775 · 1.93 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Intracellular metabolic pathways dependent on the mammalian Target Of Rapamycin (mTOR) play a key role in immune-tolerance control. In this study, we focused on long term mTOR-dependent immune-modulating effects in kidney transplant recipients undergoing conversion from Calcineurin inhibitors (CNI) to mTOR inhibitors (Everolimus), in a one-year follow-up. The conversion to Everolimus is associated with a decrease of neutrophils and of CD8(+) T cells. In addition, we observed a reduced production of Interferon(IFN)-γ by CD8+ T cells and of Interleukin(IL)-17 by CD4(+) T lymphocytes. An increase in CD4(+) CD25(+) Foxp3(+) (Treg) number was also seen. Treg increase correlated with a higher proliferation rate of this regulatory subpopulation, when compared with the CD4(+) Foxp3(-) effector counterpart. Basal phosphorylation level of S6 kinase, a major mTOR-dependent molecular target, was substantially maintained in patients treated with Everolimus. Moreover, oscillations in serum concentration of Everolimus were associated with changes in basal and activation-dependent S6 kinase phosphorylation of CD4(+) and CD8(+) T cells. Indeed, T Cell Receptor (TCR) triggering was observed to induce significantly higher S6 kinase phosphorylation in the presence of lower Everolimus serum concentrations. These results unveil the complex mTOR-dependent immune-metabolic network leading to long-term immune-modulation and might have relevance for novel therapeutic settings in kidney transplants. This article is protected by copyright. All rights reserved. © 2015 British Society for Immunology.
    Clinical & Experimental Immunology 06/2015; 182(2). DOI:10.1111/cei.12669 · 3.04 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Tetracyclines, which represent one of the most commonly used antibiotics for poultry, are known to be deposited in bones, where they can remain, despite the observation of appropriate withdrawal times. The aim of the study was to determine the concentration of oxytretracycline (OTC) residues in the bone and muscle of chickens, following the oral administration of a commercially available liquid formulation, and to test their cytotoxic effects on an in vitro cell culture model. Seventy-two 1-day-old broiler chickens were randomly allotted into 2 groups (control and treated animals). OTC (40 mg/kg BW) was administered via drinking water during the 1 to 5 and 20 to 25 days of life periods. At the end of the trial, the birds were slaughtered and the OTC residues in the target tissues were measured by means of liquid chromatography (LC) - tandem mass spectrometry (MS/MS). Cytotoxicity was assessed by evaluating the pro-apoptotic effect of the bone residues on the K562 erythroleukemic line and on the peripheral blood mononuclear cells (PBMC). In all the animals, the OTC residues in the muscle were far below the established MRL of 100 μg/kg. The OTC levels in the bones of the treated animals were instead found in the parts per million (ppm) range. Cell cytotoxicity was assessed by evaluating the pro-apoptotic effect of OTC bone residues on the haematopoietic cell system. This in vitro system has revealed a significant pro-apoptotic effect on both the K562 cell line and PBMC cultures. This result suggests potential human and animal health risks due to the entry of tetracycline residues contained in the bones of treated livestock into the food-chain. This could be of concern, particularly for canine and feline diets, as meat, bone meal, and poultry by-products represent some of the main ingredients of pet foods, especially in the case of dry pet food. Further studies are needed to define the underlying mechanisms of cytotoxicity and to evaluate the in vivo toxicological implications due to the observed in vitro effects. © 2015 Poultry Science Association Inc.
    Poultry Science 05/2015; 94(8). DOI:10.3382/ps/pev141 · 1.67 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Background Helicobacter pylori is the first bacterium formally recognized as a carcinogen and is one of the most successful human pathogens, as over half of the world’s population is colonized by the bacterium. H. pylori-induced gastroduodenal disease depends on the inflammatory response of the host and on the production of specific bacterial virulence factors. The study of Helicobacter pylori pathogenic action would greatly benefit by easy-to-use models of infection. Results In the present study, we examined the effectiveness of the larvae of the wax moth Galleria mellonella as a new model for H. pylori infection. G. mellonella larvae were inoculated with bacterial suspensions or broth culture filtrates from either different wild-type H. pylori strains or their mutants defective in specific virulence determinants, such as VacA, CagA, CagE, the whole pathogenicity island (PAI) cag, urease, and gamma-glutamyl transpeptidase (GGT). We also tested purified VacA cytotoxin. Survival curves were plotted using the Kaplan-Meier method and LD50 lethal doses were calculated. Viable bacteria in the hemocoel were counted at different time points post-infection, while apoptosis in larval hemocytes was evaluated by annexin V staining. We found that wild-type and mutant H. pylori strains were able to survive and replicate in G. mellonella larvae which underwent death rapidly after infection. H. pylori mutant strains defective in either VacA, or CagA, or CagE, or cag PAI, or urease, but not GGT-defective mutants, were less virulent than the respective parental strain. Broth culture filtrates from wild-type strains G27 and 60190 and their mutants replicated the effects observed using their respective bacterial suspension. Also, purified VacA cytotoxin was able to kill the larvae. The killing of larvae always correlated with the induction of apoptosis in hemocytes. Conclusions G. mellonella larvae are susceptible to H. pylori infection and may represent an easy to use in vivo model to identify virulence factors and pathogenic mechanisms of H. pylori. The experimental model described can be useful to screen a large number of clinical H. pylori strain and to correlate virulence of H. pylori strains with patients’ disease status.
    BMC Microbiology 08/2014; 14(1):228. DOI:10.1186/s12866-014-0228-0 · 2.73 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Myelodysplastic syndromes (MDS) are clonal disorders characterized by ineffective hematopoiesis and possible evolution to acute leukemia. Occurrence of stem cell defects and of immune-mediated mechanisms was evidenced as relevant for pathophysiology of MDS. Here, we described one case of MDS patient carrying CD14+CD56+ monocytes in bone marrow (BM), in the presence of a defective human leukocyte antigen (HLA)-E expression on peripheral blood (PB) cells and of natural killer (NK) cell expansion in PB and BM. The defective HLA-E expression and the NK expansion are proposed to be relevant for the pathogenesis of myelodysplasia in those patients showing CD14+CD56+ monocytes in BM.
    European Journal Of Haematology 09/2013; 91(3). DOI:10.1111/ejh.12152 · 2.07 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Canine leishmaniasis caused by the protozoan parasite Leishmania infantum is a chronic systemic disease endemic in Mediterranean basin. The aim of the study is to investigate the immune profile of dogs naturally infected by Leishmania infantum. In order to address such issue, CD4(+) and CD8(+) lymphocyte T cell subsets, peripheral CD4(+)CD3(+)Foxp3(+) (Treg) levels and the presence of pro-inflammatory T cells have been assessed, in 45 infected dogs and in 30 healthy animals, by using immunofluorescence and flow cytometry detection. Animals were categorised according to their clinical-pathological status and their antibody titer at diagnosis. Results showing a significant increase of CD8(+)CD3(+) T lymphocytes, a reduced percentage of the T regulatory CD4(+)CD3(+)Foxp3(+) subset and a significant increase of TH1 cells, characterise the infected dogs, regardless of their antibody titer or the occurrence of clinical symptomatic disease. These data may provide new insights into the pathogenesis of immune-mediated alterations associated with canine leishmaniasis.
    Research in Veterinary Science 08/2013; 95(3). DOI:10.1016/j.rvsc.2013.08.005 · 1.41 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Relevance of immune-dysregulation for emergence, dominance and progression of dysplastic clones in myelodysplastic syndromes (MDS) was suggested, but valuable or predictive criteria on this involvement are lacking. We previously reported that reduced T-regulatory cells (Treg) and high CD54 expression on T cell identify a sub-group of patients in whom an immune-pathogenesis might be inferred. Here, we suggest the occurrence of immune-selection of dysplastic clones in a subgroup of MDS patients, with reduced HLA-I and HLA-E on PMN, and propose that an altered immune profile might represent a valuable criterion to classify Low/Int-1 patients on the basis of immune-pathogenesis of MDS.
    Leukemia research 10/2012; 37(2). DOI:10.1016/j.leukres.2012.09.015 · 2.35 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Paroxysmal Nocturnal Haemoglobinuria (PNH) is due to pathological expansion of a stem progenitor bearing a somatic mutation of PIG-A gene involved in the biosynthesis of the glycosyl-phosphatidyl-inositol (GPI) anchor. Numerous data suggest a role for immune-mediated mechanisms in the selection/expansion of GPI-defective clone. Haemolytic anaemia in PNH is dependent on the effect of complement against GPI-defective red cells. Eculizumab, an anti-C5 monoclonal antibody, is dramatically effective in controlling haemolysis and thrombosis, in reducing fatigue and in improving quality of life of patients. However, this therapy presents new challenges that need to be properly faced. Here, we report the decrease in B, Natural Killer (NK) and regulatory T cells (Treg), an altered cytokine profile of invariant-NKT cells (NKTi) and the increasing of C-X-C chemokine receptor type 4 (CXCR4) receptor in PNH patients before the Eculizumab therapy. Treatment significantly affects some of these alterations: after Eculizumab, the number of B lymphocytes, the cytokine secretion of NKTi and CXCR4 expression on CD8 T cells became similar to healthy donors. No effects were observed on NK and Treg. The amplitude of the GPI-defective compartment remained unchanged.
    Immunobiology 12/2011; 217(7):698-703. DOI:10.1016/j.imbio.2011.11.009 · 3.04 Impact Factor

Publication Stats

15 Citations
18.23 Total Impact Points


  • 2015
    • Università degli Studi della Basilicata
      • Department of Sciences
      Potenza, Basilicate, Italy
  • 2011-2013
    • University of Naples Federico II
      • • Department of Translational Medical Sciences
      • • Department of Molecular Medicine and Medical Biotechnology
      Napoli, Campania, Italy