@article {10562, title = {Alendronate treatment induces IL-1B expression and apoptosis in glioblastoma cell line.}, journal = {Inflammopharmacology}, volume = {26}, year = {2018}, month = {2018 Feb}, pages = {285-290}, abstract = {

Alendronate (ALD), one among the nitrogen-containing bisphosphonates (NBPs), is currently used for the treatment of many pathological conditions. Unfortunately, although generally tolerated, NBPs treatment has been associated with central nervous system (CNS) adverse outcomes, such as amnesia, hallucinations and visual disturbances. So, we analyzed the effect of ALD treatment in glial cells, the main sources of cholesterol for neurons and principal cells involved in the immunological defense of the brain. We treated a glial cell line (U87-MG) with increasing doses of ALD (0.1, 1, 10, 25, 50~μM) for 48~h, aimed at evaluating the influence of this drug treatment on IL-1B expression, NLRP3 and CASP1 expression, mitochondrial activity and apoptotic cell death. We observed that ALD treatment, at the higher concentrations, induced a significant increase of IL-1B, NLRP3, CASP1 expression, provoked apoptosis and also mitochondrial damage in U87-MG. Considering the reported CNS adverse outcomes of NBPs treatment, our results confirm ALD side-effects on glial cell model.

}, keywords = {Alendronate, Apoptosis, Brain, Cell Line, Tumor, Diphosphonates, Glioblastoma, Humans, Interleukin-1beta, Neuroglia}, issn = {1568-5608}, doi = {10.1007/s10787-017-0369-5}, author = {Tricarico, Paola Maura and Epate, Angeladine and Celsi, Fulvio and Crovella, Sergio} } @article {10796, title = {Human beta defensin-1 is involved in the susceptibility to adeno-tonsillar hypertrophy.}, journal = {Int J Pediatr Otorhinolaryngol}, volume = {107}, year = {2018}, month = {2018 Apr}, pages = {135-139}, abstract = {

INTRODUCTION: Innate immunity molecules are known to play a pivotal role in the homeostasis of the oral mucosa, permitting the presence of commensal microflora and, at the same time, providing a first line of defense against pathogens attempting to invade the oral cavity. Tonsils represent the local immune tissue in oral cavity, being able to provide a non-specific response to pathogens; however, in the presence of microbes or foreign materials present in the mouth tonsils could became infected and develop chronic inflammation, thus leading to hypertrophy. The etiology of the disease is multifactorial depending upon environmental and host factors, the latter including molecules of mucosal innate immunity.

METHODS: Ninety-five children with adeno-tonsillar hypertrophy subjected to adeno-tonsillectomy were recruited at the pediatric otorhinolaryngology service of the Institute for Maternal and Child Health IRCCS Burlo Garofolo, Trieste (Italy). The specimen discarded from the surgery were used for genomic DNA extraction and genotyping, for mRNA extraction and gene expression analysis, finally the samples were cut and used to prepare slides to perform immunohistochemistry.

RESULTS: Functional polymorphisms within DEFB1 gene, encoding the human beta defensin-1 (hBD-1), were analyzed finding association between DEFB1 rare haplotypes and susceptibility to adeno-tonsillar hypertrophy. DEFB1 mRNA expression was detected in the tonsils and the hBD-1 protein was localized at the epithelia of tonsils mainly in the proximity of the basal lamina.

CONCLUSION: Our findings lead us to hypothesize an involvement of hBD-1 mediated innate immunity in the modulation of the susceptibility towards adeno-tonsillar hypertrophy development.

}, keywords = {Adenoidectomy, Adenoids, Adolescent, beta-Defensins, Child, Child, Preschool, Female, Genetic Predisposition to Disease, Genotype, Haplotypes, Humans, Hypertrophy, Immunity, Innate, Immunohistochemistry, Italy, Male, Palatine Tonsil, Tonsillectomy}, issn = {1872-8464}, doi = {10.1016/j.ijporl.2018.01.041}, author = {Zupin, Luisa and Celsi, Fulvio and Bresciani, Martina and Orzan, Eva and Grasso, Domenico Leonardo and Crovella, Sergio} } @article {10810, title = {Lopinavir/Ritonavir Treatment Induces Oxidative Stress and Caspaseindependent Apoptosis in Human Glioblastoma U-87 MG Cell Line.}, journal = {Curr HIV Res}, volume = {16}, year = {2018}, month = {2018}, pages = {106-112}, abstract = {

BACKGROUND: Lopinavir and Ritonavir (LPV/r) treatment is widely used to prevent HIV mother-to-child transmission. Nevertheless, studies related to the impact of these compounds on patients, in particular in the foetus and newborns, are strictly required due to the controversial findings reported in the literature concerning possible neurologic side effects following the administration of these drugs.

OBJECTIVES: In our study, we evaluated the impact of LPV/r treatment on the human glioblastoma U- 87 MG cell line.

METHODS: In order to evaluate the influence of Lopinavir and Ritonavir in terms of oxidative stress (ROS production), mitochondrial morphology and apoptotic cell death, the latter either in the presence or in the absence of caspase-3 and -9 inhibitors, we treated U-87 MG with increasing doses (0.1-1-10-25-50 {\textmu}M) of Lopinavir and Ritonavir for 24h, either in single formulation or in combination. ROS production was measured by flow cytometry using H2DCFDA dye, mitochondrial morphology was evaluated using MitoRed dye and apoptotic cell death was monitored by flow cytometry using Annexin V-FITC and Propidium Iodide.

RESULTS: We observed that co-treatment with Lopinavir and Ritonavir (25 and 50 {\textmu}M) promoted a significant increase in ROS production, caused mitochondrial network damage and induced apoptosis in a caspase-independent manner.

CONCLUSION: Based on our findings, concordant with others reported in the literature, we hypothesize that LPV/r treatment could not be entirely free from side effects, being aware of the need of validation in in vivo models, necessary to confirm our results.

}, issn = {1873-4251}, doi = {10.2174/1570162X16666180528100922}, author = {Gratton, Rossella and Tricarico, Paola Maura and Guimar{\~a}es, Rafael Lima and Celsi, Fulvio and Crovella, Sergio} } @article {10495, title = {Antiretroviral Treatment in HIV-1-Positive Mothers: Neurological Implications in Virus-Free Children.}, journal = {Int J Mol Sci}, volume = {18}, year = {2017}, month = {2017 Feb 15}, abstract = {

Since the worldwide introduction of antiretroviral therapy (ART) in human immunodeficiency virus type 1, HIV-1-positive mothers, together with HIV-1 testing prior to pregnancy, caesarian birth and breastfeeding cessation with replacement feeding, a reduction of HIV-1 mother-to-child transmission (MTCT) has been observed in the last few years. As such, an increasing number of children are being exposed in utero to ART. Several questions have arisen concerning the neurological effects of ART exposure in utero, considering the potential effect of antiretroviral drugs on the central nervous system, a structure which is in continuous development in the fetus and characterized by great plasticity. This review aims at discussing the possible neurological impairment of children exposed to ART in utero, focusing attention on the drugs commonly used for HIV-1 MTCT prevention, clinical reports of ART neurotoxicity in children born to HIV-1-positive mothers, and neurologic effects of protease inhibitors (PIs), especially ritonavir-"boosted" lopinavir (LPV/r) in cell and animal central nervous system models evaluating the potential neurotoxic effect of ART. Finally, we present the findings of a meta-analysis to assess the effects on the neurodevelopment of children exposed to ART in utero.

}, keywords = {Animals, Anti-HIV Agents, Antiretroviral Therapy, Highly Active, Disease Management, Disease Models, Animal, Epigenesis, Genetic, Female, HIV Infections, HIV-1, Humans, Infectious Disease Transmission, Vertical, Maternal Exposure, Meta-Analysis as Topic, Mothers, Neurodevelopmental Disorders, Pregnancy, Prenatal Exposure Delayed Effects}, issn = {1422-0067}, doi = {10.3390/ijms18020423}, author = {Coelho, Ant{\^o}nio Victor Campos and Tricarico, Paola Maura and Celsi, Fulvio and Crovella, Sergio} } @article {10486, title = {Lack of Prenylated Proteins, Autophagy Impairment and Apoptosis in SH-SY5Y Neuronal Cell Model of Mevalonate Kinase Deficiency.}, journal = {Cell Physiol Biochem}, volume = {41}, year = {2017}, month = {2017}, pages = {1649-1660}, abstract = {

BACKGROUND/AIMS: Mevalonate Kinase Deficiency (MKD), is a hereditary disease due to mutations in mevalonate kinase gene (MVK). MKD has heterogeneous clinical phenotypes: the correlation between MVK mutations and MKD clinical phenotype is still to be fully elucidated. Deficiency of prenylated proteins has been hypothesized as possible MKD pathogenic mechanism. Based on this hypothesis and considering that neurologic impairment characterizes Mevalonic Aciduria (MA), the most severe form of MKD, we studied the effects of I268T and N301T MVK mutations on protein prenylation, autophagy and programmed cell death in SH-SY5Y neuroblastoma cell lines.

METHODS: SH-SY5Y cells were transiently transfected, with the pCMV-6 plasmid containing MVK wild type and the two mutated sequences. Protein prenylation levels were evaluated using GFP-RhoA-F to assess farnesylation, and GFP-RhoA to evaluate geranylgeranylation; autophagy was measured by evaluating LC3 and p62 protein levels, while Annexin V-FITC and Propidium Iodide staining allowed apoptosis detection.

RESULTS: MVK mutants{\textquoteright} over-expression causes decreased levels of farnesylation and geranylgeranylation, and also increased LC3 lipidation in SH-SY5Y, with concomitant p62 accumulation. Treatment with bafilomycin A1 (an inhibitor of vacuolar H+-ATPase, a late autophagy inhibitor) further increase LC3-II and p62 levels, suggesting that degradation of autophagolysosome could be impaired. SH-SY5Y, with both MVK mutants, showed apoptosis increase; the presence of N301T associated with augmented cell death.

CONCLUSIONS: We hypothesize that mevalonate pathway impairment causes alteration of farnesylation and geranylgeranylation proteins and alteration of the autophagic flux; these changes can induce apoptosis, possibly more relevant in the presence of N301T mutation.

}, keywords = {Animals, Apoptosis, Autophagy, Cell Line, Tumor, Macrolides, Mevalonate Kinase Deficiency, Microtubule-Associated Proteins, Models, Biological, Mutation, Phosphotransferases (Alcohol Group Acceptor), Protein Prenylation, Rats}, issn = {1421-9778}, doi = {10.1159/000471235}, author = {Tricarico, Paola Maura and Romeo, Alessandra and Gratton, Rossella and Crovella, Sergio and Celsi, Fulvio} } @article {7746, title = {Comment to Santos et al., "hyper-IgD and periodic fever syndrome: a new MVK mutation (p.R277G) associated with a severe phenotype".}, journal = {Gene}, volume = {559}, year = {2015}, month = {2015 Mar 15}, pages = {99-101}, abstract = {

We performed molecular modeling analysis onto a novel mutation in the gene MVK, described by Santos et al., found to be causative of a severe form of Hyper-IgD/Mevalonate Kinase Deficiency. The mutation p.R277G, in our analysis, lowers the binding affinity for some enzyme{\textquoteright}s substrates. Interestingly, we found that p.R277G mutation inhibits binding of Isopentenyl Pyrophosphate (IPP) (binding free energy=0 kcal/mol), one of isoprenoids responsible for feedback-inhibition of MVK. IPP is known to be an activator of a specific class of T-cells and we can hypothesize that increased levels of this metabolite generate an aberrant immune system response. Indeed other experiments are needed to verify this hypothesis; however, this work demonstrates usefulness of molecular modeling in generating novel pathogenic hypothesis.

}, keywords = {Fever, Humans, Immunoglobulin D, Male, Mutation, Missense, Phosphotransferases (Alcohol Group Acceptor)}, issn = {1879-0038}, doi = {10.1016/j.gene.2015.01.029}, author = {Santos, Ruda de Luna Almeida and Crovella, Sergio and Celsi, Fulvio} } @article {3626, title = {HLA-G and susceptibility to develop celiac disease.}, journal = {Hum Immunol}, volume = {76}, year = {2015}, month = {2015 Jan}, pages = {36-41}, abstract = {

The Human Leukocyte Antigen-G has immunomodulatory function and its expression has been associated with several diseases. In our study we analyzed HLA-G polymorphisms in order to evaluate their possible association with susceptibility to celiac disease development. A total of 420 celiac patients and 509 controls were genotyped for HLA-G polymorphisms. We sequenced 800bp upstream the ATG codon (5{\textquoteright} upstream regulatory region) and the whole 3{\textquoteright} untranslated region of the HLA-G gene, whereas the ΔC deletion at exon 3 was detected by RFLP-PCR. Five polymorphisms (namely -477 C>G, -369 C>A, 14bp del/ins, 3187 A>G, 3196 C>G) and one haplotype (TCGGTACGAAITCCCGAG) were significantly more frequent in celiac patients than controls and associated with increased disease susceptibility. The 14bp I/I, 3187 G/G, 3196 G/G genotypes and TCGGTACGAAITCCCGAG haplotype, were still significantly associated with increased disease susceptibility (and in addition also the 3003 C/C genotype) when the analysis was restricted to patients and controls presenting the DQ2.5 or DQ8 HLA-DQ celiac disease risk haplotypes. Our findings indicate an association between HLA-G gene polymorphisms and susceptibility to celiac disease development, suggesting that HLA-G molecule is possibly involved in the pathogenesis of the disease.

}, keywords = {Adolescent, Adult, Alleles, Case-Control Studies, Celiac Disease, Child, Female, Gene Frequency, Genetic Predisposition to Disease, Haplotypes, HLA-DQ Antigens, HLA-G Antigens, Humans, Male, Middle Aged, Polymorphism, Genetic, Retrospective Studies}, issn = {1879-1166}, doi = {10.1016/j.humimm.2014.12.006}, author = {Catamo, Eulalia and Zupin, Luisa and Segat, Ludovica and Celsi, Fulvio and Crovella, Sergio} } @article {7756, title = {Knockdown of MVK does not lead to changes in NALP3 expression or activation.}, journal = {J Inflamm (Lond)}, volume = {12}, year = {2015}, month = {2015}, pages = {7}, abstract = {

BACKGROUND: Mutations in the Mevalonate Kinase gene (MVK) are causes of a rare autoinflammatory disease: Mevalonate Kinase Deficiency and its more acute manifestation, Mevalonic Aciduria. The latter is characterized, among other features, by neuroinflammation, developmental delay and ataxia, due to failed cerebellar development or neuronal death through chronic inflammation. Pathogenesis of neuroinflammation in Mevalonate Kinase Deficiency and Mevalonic Aciduria has not yet been completely clarified, however different research groups have been suggesting the inflammasome complex as the key factor in the disease development. A strategy to mimic this disease is blocking the mevalonate pathway, using HMG-CoA reductase inhibitors (Statins), while knock-out mice for Mevalonate Kinase are non-vital and their hemyzygous (i.e only one copy of gene preserved) littermate display almost no pathological features.

FINDINGS: We sought to generate a murine cellular model closely resembling the pathogenic conditions found in vivo, by direct silencing of Mevalonate Kinase gene. Knockdown of Mevalonate Kinase in a murine microglial cellular model (BV-2 cells) results in neither augmented NALP3 expression nor increase of apoptosis. On the contrary, statin treatment of BV-2 cells produces an increase both in Mevalonate Kinase and NALP3 expression.

CONCLUSIONS: MKD deficiency could be due or affected by protein accumulation leading to NALP3 activation, opening novel questions about strategies to tackle this disease.

}, issn = {1476-9255}, doi = {10.1186/s12950-015-0048-5}, author = {Celsi, Fulvio and Piscianz, Elisa and Romano, Maurizio and Crovella, Sergio} } @article {7714, title = {Mevalonate Pathway Blockade, Mitochondrial Dysfunction and Autophagy: A Possible Link.}, journal = {Int J Mol Sci}, volume = {16}, year = {2015}, month = {2015}, pages = {16067-84}, abstract = {

The mevalonate pathway, crucial for cholesterol synthesis, plays a key role in multiple cellular processes. Deregulation of this pathway is also correlated with diminished protein prenylation, an important post-translational modification necessary to localize certain proteins, such as small GTPases, to membranes. Mevalonate pathway blockade has been linked to mitochondrial dysfunction: especially involving lower mitochondrial membrane potential and increased release of pro-apoptotic factors in cytosol. Furthermore a severe reduction of protein prenylation has also been associated with defective autophagy, possibly causing inflammasome activation and subsequent cell death. So, it is tempting to hypothesize a mechanism in which defective autophagy fails to remove damaged mitochondria, resulting in increased cell death. This mechanism could play a significant role in Mevalonate Kinase Deficiency, an autoinflammatory disease characterized by a defect in Mevalonate Kinase, a key enzyme of the mevalonate pathway. Patients carrying mutations in the MVK gene, encoding this enzyme, show increased inflammation and lower protein prenylation levels. This review aims at analysing the correlation between mevalonate pathway defects, mitochondrial dysfunction and defective autophagy, as well as inflammation, using Mevalonate Kinase Deficiency as a model to clarify the current pathogenetic hypothesis as the basis of the disease.

}, issn = {1422-0067}, doi = {10.3390/ijms160716067}, author = {Tricarico, Paola Maura and Crovella, Sergio and Celsi, Fulvio} } @article {3603, title = {Non-classical MHC-I human leukocyte antigen (HLA-G) in hepatotropic viral infections and in hepatocellular carcinoma.}, journal = {Hum Immunol}, volume = {75}, year = {2014}, month = {2014 Dec}, pages = {1225-31}, abstract = {

The human leukocyte antigen (HLA)-G is a "nonclassical" major histocompatibility complex (MHC) class Ib gene, located at chromosome 6, in the 6p21.3 region. The HLA-G presents immunomodulatory functions essential in pregnancy for the tolerance of the semi-allogenic fetus, but an abnormal expression of HLA-G has been observed in numerous pathological conditions, such as tumors, autoimmune diseases and viral infections. In recent years, numerous studies have assessed the clinical relevance of HLA-G expression in different types of cancer: in general, a higher HLA-G expression correlates with a lower survival rate or a shorter disease-free survival. Altered expression of HLA-G has been found in both HCV and HBV infection, and some genetic polymorphisms have been associated with altered susceptibility/disease development for these infections, however, whether the biologic role of HLA-G in HCV and HBV infection is beneficial or hazardous, it is not completely clear. In the context of hepatocellular carcinoma, HLA-G has shown a potential diagnostic role, moreover a prognostic value in HCC patients has been also attributed to HLA-G molecules. We revise here the role of HLA-G in hepatotropic HBV/HCV infections and in hepatocellular carcinoma (HCC).

}, keywords = {Carcinoma, Hepatocellular, Female, Genetic Predisposition to Disease, Hepatitis B, Hepatitis C, HLA-G Antigens, Humans, Immune Tolerance, Liver Neoplasms, Polymorphism, Genetic, Pregnancy}, issn = {1879-1166}, doi = {10.1016/j.humimm.2014.09.019}, author = {Catamo, Eulalia and Zupin, Luisa and Crovella, Sergio and Celsi, Fulvio and Segat, Ludovica} }