@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 {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 {1943, title = {Lovastatin-induced apoptosis is modulated by geranylgeraniol in a neuroblastoma cell line.}, journal = {Int J Dev Neurosci}, volume = {30}, year = {2012}, month = {2012 Oct}, pages = {451-6}, abstract = {

Mevalonic aciduria (MA), the most severe form of mevalonate kinase deficiency (MKD), is still an orphan drug disease and the pathogenetic mechanisms underlying neuronal dysfunction is still poorly understood. In our study we have investigated the apoptotic mechanism mediated by the exposure of the cultured neuroblastoma cell line, SH-SY5Y, to lovastatin in absence or in presence of the isoprenoid, geranylgeraniol, with the aim of unraveling the pathogenesis of MA. Lovastatin, blocks the mevalonate pathway inhibiting the 3-hydroxy-3-methylglutaryl-CoA reductase (HMG-CR), an enzyme of the mevalonate pathway upstream the mevalonate kinase enzyme, reproducing biochemical features similar to those found in MKD. We demonstrate that apoptosis in neuronal lovastatin treated-cells is induced by the mitochondrial pathway, with caspase-9 as the initiator and caspase-3 as the effector caspase. The presence of geranylgeraniol modulates both the caspase-9 and caspase-3 activity in a dose-dependent way, confirming that this isoprenoid enters the mevalonate pathway, is metabolized and finally is able to by-pass the statin biochemical block reconstituting the mevalonate pathway. According to our findings, it should not be the time course adopted that modulates the apoptotic response but rather the isoprenoid itself. Being aware that our results have been obtained using a biochemical model of MKD, and not cells from patients with the disease, we believe our findings increase the knowledge of MA pathogenesis, and may possibly contribute to the development of novel therapeutic strategies.

}, keywords = {Analysis of Variance, Apoptosis, Caspases, Cell Line, Tumor, Diterpenes, Dose-Response Relationship, Drug, Drug Interactions, Humans, Hydroxymethylglutaryl-CoA Reductase Inhibitors, Lovastatin, Neuroblastoma, Time Factors}, issn = {1873-474X}, doi = {10.1016/j.ijdevneu.2012.06.002}, author = {Marcuzzi, Annalisa and Zanin, Valentina and Piscianz, Elisa and Tricarico, Paola Maura and Vuch, Josef and Girardelli, Martina and Monasta, Lorenzo and Bianco, Anna Monica and Crovella, Sergio} }