0000000000246571
AUTHOR
Vicent Guillem
showing 12 related works from this author
Polyethyleneimine-based immunopolyplex for targeted gene transfer in human lymphoma celllines
2002
Background Specific and efficient delivery of genes into targeted cells is a priority objective in non-viral gene therapy. Polyethyleneimine-based polyplexes have been reported to be good non-viral transfection reagents. However, polyplex-mediated DNA delivery occurs through a non-specific mechanism. This article reports the construction of an immunopolyplex, a targeted non-viral vector based on a polyplex backbone, and its application in gene transfer over human lymphoma cell lines. Methods Targeting elements (biotin-labeled antibodies), which should recognize a specific element of the target cell membrane and promote nucleic acid entry into the cell, were attached to the polyplex backbone…
The Genotype of the Donor for the (GT)n Polymorphism in the Promoter/Enhancer of FOXP3 Is Associated with the Development of Severe Acute GVHD but Do…
2015
The FOXP3 gene encodes for a protein (Foxp3) involved in the development and functional activity of regulatory T cells (CD4+/CD25+/Foxp3+), which exert regulatory and suppressive roles over the immune system. After allogeneic stem cell transplantation, regulatory T cells are known to mitigate graft versus host disease while probably maintaining a graft versus leukemia effect. Short alleles (<=(GT)(15)) for the (GT)(n) polymorphism in the promoter/enhancer of FOXP3 are associated with a higher expression of FOXP3, and hypothetically with an increase of regulatory T cell activity. This polymorphism has been related to the development of auto-or alloimmune conditions including type 1 diabetes …
Targeted oligonucleotide delivery in human lymphoma cell lines using a polyethyleneimine based immunopolyplex.
2002
The efficacy of antisense gene therapy depends on efficient delivery of oligonucleotides into targeted cells. Although polyethyleneimine based polyplexes have been reported as good transfection reagents, they are inefficient in lymphoid cell transfection. We report the construction of an immunopolyplex, a targeted nonviral vector based on a polyplex backbone and its application for oligonucleotide transfer on human lymphoma cell lines. The salient characteristic of immunopolyplex lies in the possibility of easily replacing the targeting element (antibody), leaving the polyplex backbone intact. Furthermore, a study was made of the influence of endocytosis inhibitors on immunopolyplex activit…
Bone marrowVEGFCexpression is associated with multilineage dysplasia and several prognostic markers in adult acute myeloid leukemia, but not with sur…
2018
Vascular endothelial growth factor C (VEGFC) stimulates leukemia cell proliferation and survival, and promotes angiogenesis. We studied VEGFC expression in bone marrow samples from 353 adult acute myeloid leukemia (AML) patients and its relationship with several clinical, cytogenetic, and molecular variables. We also studied the expression of 84 genes involved in VEGF signaling in 24 patients. We found that VEGFC expression was higher in AML patients with myelodysplasia-related changes (AML-MRC) than in patients with non-AML-MRC. We also found an association between VEGFC expression and the patient cytogenetic risk group, with those with a worse prognosis having higher VEGFC expression leve…
BCL2 gene polymorphisms and splicing variants in chronic myeloid leukemia.
2015
Recent data suggest that constitutional genetic variation in the antiapoptotic BCL2 gene could be associated with the susceptibility to develop chronic myeloid leukemia (CML) and the clinical outcome in several hematological malignancies. The present study examines whether BCL2 single nucleotide polymorphisms (SNPs) predispose to CML or may potentially influence the disease characteristics at diagnosis. Notably, no association was observed between the four candidate BCL2 SNPs and the risk of developing CML. Instead, the 4777C>A (rs2279115) and the 5735A>G (rs1801018) SNPs were significantly associated with the disease risk profile as determined by the Sokal score. We found that such polymor…
Pharmacodynamic approach to study the gene transfer process employing non-viral vectors
2000
Abstract In the present work we set out to apply pharmacodynamic concepts derived from dose–response curves (Potency and Efficacy) to characterize the gene transfer efficiency of a vector:DNA complex. We employed two widely used vectors, the cationic lipid DOTAP (N,N,N-trimethyl 1-2-3-bis (1-oxo-9-octa-decenyl)oxy-(Z,Z)-1-propanaminium methyl sulfate) and the cationic polymer PEI (polyethylenimine, 800 kDa) to transfect several constructions of the green fluorescent protein cDNA. The analysis of dose–response curves indicated that in all cases the goodness-of-fit was > 0.99. Potency is a measure that provides information on gene activity per amount of DNA. Efficacy is a measure of maximum g…
Influence of DNA damage and repair upon the risk of treatment related leukemia
2008
Therapy-related myelodysplasia and acute myeloid leukemia (t-MDS/AML) are malignancies occurring after exposure to chemotherapy and/or radiotherapy. Several studies have addressed cumulative dose, dose intensity and exposure to specific agents of preceding cytotoxic therapy in relation to the risk of developing such leukemia. Since only a small percentage of patients exposed to cytotoxic therapy develop t-MDS/AML, it has been suggested that some genetic predisposition may be involved, specifically associated to polymorphisms in certain genes involved in chemotherapy/radiotherapy response - fundamentally genes intervening in drug detoxification and DNA synthesis and repair. A review is made …
Stability of PEI–DNA and DOTAP–DNA complexes: effect of alkaline pH, heparin and serum
2001
Abstract DNA complexes formed with nonviral vectors such as polyethylenimine (PEI) or 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP) are widely used in gene therapy. These complexes prevent the interaction of DNA with the fluorescent probes usually employed to quantify DNA. We thus studied the procedures for DNA quantification from DNA complexes as well as their stability in the presence of DNase or mouse, rat and human sera. Release of the DNA from its complexes was accomplished by increasing the pH of the medium (from 7.3 to 13.4) or by adding heparin. The stability against degradation was tested in vitro, by incubating the complexes at 37°C in the presence of DNase I and sera from the …
Association of RBP4 genetic variants with childhood obesity and cardiovascular risk factors
2015
Background Recent data suggest that retinol-binding protein 4 (RBP4) gene variants could be associated with a risk of obesity and its co-morbidities, such as metabolic syndrome, which increases the risk of developing type 2 diabetes mellitus and cardiovascular disease. Objectives The present study examined the potential association of RBP4 single nucleotide polymorphisms (SNPs) with childhood obesity and its metabolic complications. Methods Four RBP4 SNPs, rs3758538 (3944A>C), rs3758539 (4406G>A), rs12265684 (12177G>C) and rs34571439 (14684T>G), were genotyped in a population of 180 Spanish Caucasian children (97 obese and 83 normal-weight children). Association of RBP4 SNPs with obesity, m…
A polymorphism in the TYMP gene is associated with the outcome of HLA-identical sibling allogeneic stem cell transplantation.
2013
Thymidine phosphorylase (TYMP), an enzyme involved in nucleotide synthesis, has been implicated in critical biological processes such as DNA replication, protection against mutations, and tissue repair. In this work, we retrospectively evaluated the influence of a polymorphism in the TYMP gene (rs112723255; G/A) upon the outcome of 448 patients subjected to allogeneic stem cell transplantation (allo-SCT) from an human leukocyte antigen (HLA)-identical sibling donor. The TYMP genotype of patients correlated with overall survival—carriers of the minor allele (A) being at an increased risk of dying after transplantation (hazard ratio, HR = 1.9; P = 0.004). This effect was mostly due to differe…
Functional polymorphisms in SOCS1 and PTPN22 genes correlate with the response to imatinib treatment in newly diagnosed chronic-phase chronic myeloid…
2011
a b s t r a c t The function of the natural modulators of BCR-ABL-induced signaling pathways could influence the results to imatinib treatment. We assessed the association between single nucleotide polymorphisms (SNPs) on genes of the phosphatase family and the suppressors of cytokine signaling and the response to imatinib in 105 patients newly diagnosed with chronic-phase CML. SNPs in SOCS1 (rs243327) and PTPN22 (rs2476601) genes correlated with the risk of primary resistance to imatinib. A high-risk Sokal score, the T allele in PTPN22 SNP, and each copy of the C allele in SOCS1 SNP were adverse prognostic factors for failure-free survival (FFS). Based on such parameters, three risk groups…
Identification and Characterization of Single Nucleotide Polymorphisms (SNPs) Associated with Genetic Predisposition to Develop Therapy-Related Acute…
2004
Introduction: Polymorphisms in certain genes involved on chemo/radio therapy response, as genes involved on DNA synthesis and repair, oxidative stress and drug detoxification, could be related to increased risk of develop t-AML. Objectives: To identified SNPs on genes that could be involved on putative risk of developing t-AML. To analyse the influence of relevant polymorphisms between groups of patients depending of the intensity and the type of treatment received. Material and Methods: Twelve polymorphisms located on genes from drug detoxification pathways (NOQ1, GSTP1), DNA repair (XPC[3], XRCC1[2], NBS1, ERCC5 and XRCC3) and DNA synthesis (MTHFR[2]) were studied. The analysis was carrie…