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Ymittos Athens, Greece

Athanasopoulos A.,Institute of Biosciences and Applications | Boleti H.,Institute Pasteur Hellenique | Scazzocchio C.,Imperial College London | Scazzocchio C.,University Paris - Sud | Sophianopoulou V.,Institute of Biosciences and Applications
Fungal Genetics and Biology | Year: 2013

In the model filamentous fungus Aspergillus nidulans, PilA and PilB, two homologues of the Saccharomyces cerevisiae eisosome proteins Pil1/Lsp1, and SurG, a strict orthologue of Sur7, are assembled and form tightly packed structures in conidiospores. As A. nidulans differs in its reproduction pattern from the Saccharomycotina in that it has the ability to reproduce through two different types of spores, conidiospores and ascospores, the products of the asexual and the sexual cycle respectively, we investigated the eisosome distribution and localization during the sexual cycle. Our results show that core eisosome proteins PilA, PilB and SurG are not expressed in hülle cells or early ascospores, but are expressed in mature ascospores. All eisosomal proteins form punctate structures at the membrane of late ascospores. In mature but quiescent ascospores, PilA forms static punctate structures at the plasma membrane. PilB also was observed at the ascospore membrane as well, with higher concentration at the areas where the two halves of ascospores are joined together. Finally, SurG was localized both at the membrane of ascospores and perinuclearly. In germlings originating from ascospores the punctate structures were shown to be composed only of PilA. PilB is diffused in the cytoplasm and SurG was located in vacuoles and endosomes. This altered localization is identical to that found in germlings originated from conidiospores. In germinated ascospores PilA foci did not colocalise with the highly mobile and transient peripheral punctate structures of AbpA, a marker for sites of clathrin-mediated endocytosis. Deletions of each one or all the three core eisosomal genes do not affect viability or germination of ascospores. In the presence of myriocin - a specific inhibitor of sphingolipid biosynthesis - PilA-GFP foci of ascospore germlings were less numerous and their distribution was significantly altered, suggesting a correlation between PilA foci and sphingolipid biosynthesis. © 2013 Elsevier Inc.

Symeonidou I.,Aristotle University of Thessaloniki | Hatzistilianou M.,Aristotle University of Thessaloniki | Papadopoulos E.,Aristotle University of Thessaloniki | Dovas C.I.,Aristotle University of Thessaloniki | And 5 more authors.
European Journal of Inflammation | Year: 2011

The prevalence of canine leishmaniosis (CanL) infection in an enzootic area is considerably higher than the overall prevalence of the disease, suggesting a role of host genetics related to the outcome of the disease. It is accepted that one determining factor for the outcome of CanL is the type of the triggered immune response, which seems to be genetically determined. TNF-α is a cytokine which plays a crucial role during the immune response against Leishmania parasites. In the present study a case-control study with 20 resistant and 20 susceptible dogs was performed. The distribution of breeds was equal in both groups. By Sanger method the nucleotide sequence upstream the Open Reading Frame of the canine TNF-α gene was determined and four polymorphisms were identified (-40 C/A, -1134 T/G, -1150 T/C και -1243 C/G). Statistical analysis showed that the polymorphism TNF-α -40 C/A is correlated with susceptibility to CanL, while the polymorphism TNF-α -1243 C/G is correlated with resistance to CanL. Further statistical analysis, regarding the possible correlation of gender as well as clinical manifestations of the disease with the above-mentioned polymorphisms of the TNF-α gene, showed no significant findings. Further analysis of the above polymorphisms, as well as identification of more polymorphisms in candidate genes, is required to provide a better understanding of the complex underlying immune response in CanL. Copyright © by BIOLIFE, s.a.s.

Symeonidou I.,Aristotle University of Thessaloniki | Pappa S.,Arisotle University of Thessaloniki | Kourelis A.,Aristotle University of Thessaloniki | Anogeianaki A.,Aristotle University of Thessaloniki | And 3 more authors.
International Journal of Immunopathology and Pharmacology | Year: 2010

The NF-κB pathway gene expression profiles were compared between 10, 20 and 39 days after Trichinella spiralis experimental infection in BALB/c mice. Out of 128 genes, 19 (14.8%) genes were present in non-infected and post-infected mice. The expression of 7 (36.8%) genes was downregulated 10 and 20 days post-infection while 3 (15.8%) genes were upregulated 39 days post-infection. The present study lists the candidate genes of the NF-κB signaling pathway that were commonly and differentially expressed between the specific points of T. spiralis infection, thus suggesting that these genes need to be further investigated to reveal the mechanism of the T. spiralis modulation of the NF-κB signaling pathways. Copyright © by BIOLIFE, s.a.s.

Koros C.,National and Kapodistrian University of Athens | Ioannidis A.,University of Peloponnese | Acquaviva T.,Neurological Clinic | Zoga M.,National and Kapodistrian University of Athens | And 4 more authors.
In Vivo | Year: 2014

Aim: The pathogenic role of Herpes Simplex Virus (HSV) 1 and 2 in Multiple Sclerosis (MS) still remains obscure. The aim of our study was the assessment of HSV1 and 2 DNA prevalence in the cerebrospinal fluid (CSF) of MS patients compared to patients with other neurological disorders (OND). Materials and Methods: HSV1 and HSV2 DNA detection in the CSF of patients was performed by real time polymerase chain reaction (PCR). Results: The genome of HSV1 was present in the CSF of 4.7% of MS patients (4 out of 85), while HSV2 was not detected in any patient. In the sub-group of OND patients, HSV1 was detected in 7.9% of patients (3 out of 38) and HSV2 was detected in 5.3% of patients (2 out of 38). Conclusion: Our data are in accordance with a limited number of previous reports, supporting a prevalence of HSV1 genome in less than 5% of MS patients.

Njouom R.,Center Pasteur du Cameroun | Nerrienet E.,Center Pasteur du Cameroun | Budkowska A.,Institute Pasteur Paris | Maillard P.,Institute Pasteur Paris | And 3 more authors.
Journal of Clinical Virology | Year: 2010

Background: According to previous data, the antibodies produced during natural hepatitis C virus (HCV) infection frequently recognize amino acids 10-43 in the core protein and 1689-1740 or 1921-1940 in the non-structural 4B (NS4B) protein. The reactivity of these peptides with the corresponding antibodies has mainly been evaluated using serum samples from Western countries where HCV genotype 1 (HCV-1) is predominant, and no information is available concerning samples from sub-Saharan countries where high HCV variability has been reported. Objective of this study: To evaluate the performance of HCV core and NS4B peptide-based immunoassays in the serodiagnosis of HCV infection in Cameroon subjects. Study design: Three core and four NS4B-based synthetic peptides derived from HCV genotypes 1b and 2a were designed and tested against a panel of 151 serum samples from Cameroon (40 positive for HCV-1, 32 for HCV-2, 39 HCV-4, and 40 HCV-negative). Results: The three core peptides all demonstrated strong immunoreactivity, regardless of the HCV genotype from which they were derived, with greater than 90% and 92% sensitivity and specificity. In contrast, the NS4B-derived peptides exhibited lower sensitivities (24.3-65.8% depending on the HCV genotype) but higher specificities (100% for all four peptides tested). Conclusions: Our findings indicate that an HCV core peptide could be used for the diagnosis of chronic HCV infection. Among the NS4B peptides tested, a chimeric NS4B peptide encompassing both N- and C-terminal portions of the NS4B protein gave a much better performance than the two component N- and C-terminal peptides used individually. © 2010 Elsevier B.V.

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