Parasitic and Immune mediated Diseases

Rome, Italy

Parasitic and Immune mediated Diseases

Rome, Italy

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Negri D.R.M.,Parasitic and Immune mediated Diseases | Rossi A.,Parasitic and Immune mediated Diseases | Blasi M.,Viale Regina Elena | Blasi M.,Duke University | And 8 more authors.
Retrovirology | Year: 2012

Background: Integrase defective lentiviral vectors (IDLV) represent a promising delivery system for immunization purposes. Human dendritic cells (DC) are the main cell types mediating the immune response and are readily transduced by IDLV, allowing effective triggering of in vitro expansion of antigen-specific primed CD8+ T cells. However, IDLV expression in transduced DC is at lower levels than those of the integrase (IN) competent counterpart, thus requiring further improvement of IDLV for future use in the clinic.Results: In this paper we show that the addition of simian immunodeficiency (SIV)-Vpx protein in the vector preparation greatly improves transduction of human and simian DC, but not of murine DC, thus increasing the ability of transduced DC to act as functional antigen presenting cells, in the absence of integrated vector sequences. Importantly, the presence of SIV-Vpx allows for using lower dose of input IDLV during in vitro transduction, thus further improving the IDLV safety profile.Conclusions: These results have significant implications for the development of IDLV-based vaccines. © 2012 Negri et al.; licensee BioMed Central Ltd.


PubMed | Parasitic and Immune mediated Diseases.
Type: Journal Article | Journal: The new microbiologica | Year: 2013

Chicken products represent a source for multidrug-resistant Escherichia coli causing extraintestinal infections (ExPEC) in humans. We applied phylogenetic analysis to a collection of E. coli strains from both hosts (poultry/humans) to improve our understanding of the origin and spread of ExPEC in humans. The dataset consisted of 58 sequences among 172 E. coli strains from human extraintestinal infections and avian species. Human phylogenetic tree analysis showed a major clade, within which ST clones belonging to groups A and B1 were largely intermixed, and two clusters, each exclusively including B2 or D clones. The avian tree exhibited greater heterogeneity between and within clades/clusters. In the Bayesian tree, consisting of sequences from both human and avian E. coli, the B2 and D human ST clones were clustered together separate from the avian strains, whereas B1 and A ST clones (frequently associated with multidrug resistance) were intermixed with avian strains. This study suggests that a subgroup of E. coli clones, A and B1, associated with multidrug resistance, is potentially exchangeable between poultry and humans. Such a subgroup may be of public health concern. On the contrary, E. coli clones included in B2 and D appeared clearly separate between human and avian sources, suggesting a minor zoonotic potential of these phylotypes.


PubMed | Parasitic and Immune Mediated Diseases
Type: Journal Article | Journal: Journal of microbiology (Seoul, Korea) | Year: 2010

The pathogenesis of Legionella pneumophila mainly resides in its ability to inhibit the phagosome-lysosome fusion, which normally prevents the killing of the host cells. In order to characterize the molecular alterations that occurred in a spontaneous avirulent mutant of Legionella pneumophila serogroup 6, named Vir-, we investigated the ability of the mutant to adhere to and multiply in the WI26VA4 alveolar epithelial cell line and in human macrophages, when compared to its parental strain, Vir+. We also determined the colocalization of bacteria with LAMP-1 to gain an insight into the phagosome-lysosome fusion process. Additionally, we determined the flagellin expression and dotA nucleotide sequencing. We observed a lack of expression of flagellin and an in-frame mutation in the dotA. gene. The data obtained strongly suggest the loss of virulence of the mutant could probably be due to the absence of flagellin and the dysfunctional type IV secretion System, resulting from the DotA protein being severely compromised.


PubMed | Parasitic and Immune mediated Diseases
Type: Journal Article | Journal: The new microbiologica | Year: 2010

Molecular analyses of mip and ompA genes were performed on 20 Neisseria gonorrhoeae isolates. The genes were present with a high degree of conservation in all strains. Sera from patients with urethritis or disseminated gonococcal infections were able to recognize the purified Neisseria gonorrhoeae macrophage infectivity potentiator (Ng-MIP) and Neisseria gonorrhoeae outer membrane protein A (Ng-OmpA).


PubMed | Parasitic and Immune mediated Diseases
Type: | Journal: Retrovirology | Year: 2012

Integrase defective lentiviral vectors (IDLV) represent a promising delivery system for immunization purposes. Human dendritic cells (DC) are the main cell types mediating the immune response and are readily transduced by IDLV, allowing effective triggering of in vitro expansion of antigen-specific primed CD8+ T cells. However, IDLV expression in transduced DC is at lower levels than those of the integrase (IN) competent counterpart, thus requiring further improvement of IDLV for future use in the clinic.In this paper we show that the addition of simian immunodeficiency (SIV)-Vpx protein in the vector preparation greatly improves transduction of human and simian DC, but not of murine DC, thus increasing the ability of transduced DC to act as functional antigen presenting cells, in the absence of integrated vector sequences. Importantly, the presence of SIV-Vpx allows for using lower dose of input IDLV during in vitro transduction, thus further improving the IDLV safety profile.These results have significant implications for the development of IDLV-based vaccines.

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