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1.
EMBO J ; 38(19): e101704, 2019 10 01.
Artículo en Inglés | MEDLINE | ID: mdl-31429971

RESUMEN

The TRAnsport Protein Particle (TRAPP) complex controls multiple membrane trafficking steps and is strategically positioned to mediate cell adaptation to diverse environmental conditions, including acute stress. We have identified the TRAPP complex as a component of a branch of the integrated stress response that impinges on the early secretory pathway. The TRAPP complex associates with and drives the recruitment of the COPII coat to stress granules (SGs) leading to vesiculation of the Golgi complex and arrest of ER export. The relocation of the TRAPP complex and COPII to SGs only occurs in cycling cells and is CDK1/2-dependent, being driven by the interaction of TRAPP with hnRNPK, a CDK substrate that associates with SGs when phosphorylated. In addition, CDK1/2 inhibition impairs TRAPP complex/COPII relocation to SGs while stabilizing them at ER exit sites. Importantly, the TRAPP complex controls the maturation of SGs. SGs that assemble in TRAPP-depleted cells are smaller and are no longer able to recruit RACK1 and Raptor, two TRAPP-interactive signaling proteins, sensitizing cells to stress-induced apoptosis.


Asunto(s)
Vesículas Cubiertas por Proteínas de Revestimiento/metabolismo , Proteínas de Transporte de Membrana/metabolismo , Estrés Fisiológico , Animales , Proteína Quinasa CDC2/metabolismo , Línea Celular , Quinasa 2 Dependiente de la Ciclina/metabolismo , Retículo Endoplásmico/metabolismo , Células HeLa , Humanos , Ratas
2.
J Clin Immunol ; 43(6): 1093-1103, 2023 08.
Artículo en Inglés | MEDLINE | ID: mdl-37209324

RESUMEN

Autoantibodies (auto-Abs) neutralizing type I interferons (IFNs) are found in the blood of at least 15% of unvaccinated patients with life-threatening COVID-19 pneumonia. We report here the presence of auto-Abs neutralizing type I IFNs in the bronchoalveolar lavage (BAL) of 54 of the 415 unvaccinated patients (13%) with life-threatening COVID-19 pneumonia tested. The 54 individuals with neutralizing auto-Abs in the BAL included 45 (11%) with auto-Abs against IFN-α2, 37 (9%) with auto-Abs against IFN-ω, 54 (13%) with auto-Abs against IFN-α2 and/or ω, and five (1%) with auto-Abs against IFN-ß, including three (0.7%) with auto-Abs neutralizing IFN-α2, IFN-ω, and IFN-ß, and two (0.5%) with auto-Abs neutralizing IFN-α2 and IFN-ß. Auto-Abs against IFN-α2 also neutralize the other 12 subtypes of IFN-α. Paired plasma samples were available for 95 patients. All seven patients with paired samples who had detectable auto-Abs in BAL also had detectable auto-Abs in plasma, and one patient had auto-Abs detectable only in blood. Auto-Abs neutralizing type I IFNs are, therefore, present in the alveolar space of at least 10% of patients with life-threatening COVID-19 pneumonia. These findings suggest that these auto-Abs impair type I IFN immunity in the lower respiratory tract, thereby contributing to hypoxemic COVID-19 pneumonia.


Asunto(s)
COVID-19 , Interferón Tipo I , Humanos , Autoanticuerpos , Interferón-alfa , Lavado Broncoalveolar
3.
Molecules ; 27(3)2022 Jan 27.
Artículo en Inglés | MEDLINE | ID: mdl-35164139

RESUMEN

Butyrate is a major gut microbiome metabolite that regulates several defense mechanisms against infectious diseases. Alterations in the gut microbiome, leading to reduced butyrate production, have been reported in patients with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. A new butyrate releaser, useful for all the known applications of butyrate, presenting physiochemical characteristics suitable for easy oral administration, (N-(1-carbamoyl-2-phenyl-ethyl) butyramide (FBA), has been recently developed. We investigated the protective action of FBA against SARS-CoV-2 infection in the human small intestine and enterocytes. Relevant aspects of SARS-CoV-2 infection were assessed: infectivity, host functional receptor angiotensin-converting enzyme-2 (ACE2), transmembrane protease serine 2 (TMPRSS2), neuropilin-1 (NRP1), pro-inflammatory cytokines expression, genes involved in the antiviral response and the activation of Nf-kB nuclear factor (erythroid-derived 2-like) 2 (Nfr2) pathways. We found that FBA positively modulates the crucial aspects of the infection in small intestinal biopsies and human enterocytes, reducing the expression of ACE2, TMPRSS2 and NRP1, pro-inflammatory cytokines interleukin (IL)-15, monocyte chemoattractant protein-1 (MCP-1) and TNF-α, and regulating several genes involved in antiviral pathways. FBA was also able to reduce the number of SARS-CoV-2-infected cells, and ACE2, TMPRSS2 and NRP1 expression. Lastly, through the inhibition of Nf-kB and the up-regulation of Nfr2, it was also able to reduce the expression of pro-inflammatory cytokines IL-15, MCP-1 and TNF-α in human enterocytes. The new butyrate releaser, FBA, exerts a preventive action against SARS-CoV-2 infection. It could be considered as an innovative strategy to limit COVID-19.


Asunto(s)
Butiratos/farmacología , Tratamiento Farmacológico de COVID-19 , SARS-CoV-2/metabolismo , Antivirales/farmacología , Butiratos/metabolismo , COVID-19/metabolismo , Células CACO-2 , Enterocitos/efectos de los fármacos , Enterocitos/metabolismo , Expresión Génica/genética , Regulación de la Expresión Génica/genética , Humanos , Intestinos/efectos de los fármacos , Intestinos/metabolismo , Masculino , SARS-CoV-2/efectos de los fármacos , SARS-CoV-2/patogenicidad
4.
Gastroenterology ; 156(4): 1173-1189.e5, 2019 03.
Artículo en Inglés | MEDLINE | ID: mdl-30452922

RESUMEN

BACKGROUND & AIMS: Wilson disease (WD) is an inherited disorder of copper metabolism that leads to copper accumulation and toxicity in the liver and brain. It is caused by mutations in the adenosine triphosphatase copper transporting ß gene (ATP7B), which encodes a protein that transports copper from hepatocytes into the bile. We studied ATP7B-deficient cells and animals to identify strategies to decrease copper toxicity in patients with WD. METHODS: We used RNA-seq to compare gene expression patterns between wild-type and ATP7B-knockout HepG2 cells exposed to copper. We collected blood and liver tissues from Atp7b-/- and Atp7b+/- (control) rats (LPP) and mice; some mice were given 5 daily injections of an autophagy inhibitor (spautin-1) or vehicle. We obtained liver biopsies from 2 patients with WD in Italy and liver tissues from patients without WD (control). Liver tissues were analyzed by immunohistochemistry, immunofluorescence, cell viability, apoptosis assays, and electron and confocal microscopy. Proteins were knocked down in cell lines using small interfering RNAs. Levels of copper were measured in cell lysates, blood samples, liver homogenates, and subcellular fractions by spectroscopy. RESULTS: After exposure to copper, ATP7B-knockout cells had significant increases in the expression of 103 genes that regulate autophagy (including MAP1LC3A, known as LC3) compared with wild-type cells. Electron and confocal microscopy visualized more autophagic structures in the cytoplasm of ATP7B-knockout cells than wild-type cells after copper exposure. Hepatocytes in liver tissues from patients with WD and from Atp7b-/- mice and rats (but not controls) had multiple autophagosomes. In ATP7B-knockout cells, mammalian target of rapamycin (mTOR) had decreased activity and was dissociated from lysosomes; this resulted in translocation of the mTOR substrate transcription factor EB to the nucleus and activation of autophagy-related genes. In wild-type HepG2 cells (but not ATP7B-knockout cells), exposure to copper and amino acids induced recruitment of mTOR to lysosomes. Pharmacologic inhibitors of autophagy or knockdown of autophagy proteins ATG7 and ATG13 induced and accelerated the death of ATP7B-knockout HepG2 cells compared with wild-type cells. Autophagy protected ATP7B-knockout cells from copper-induced death. CONCLUSION: ATP7B-deficient hepatocytes, such as in those in patients with WD, activate autophagy in response to copper overload to prevent copper-induced apoptosis. Agents designed to activate this autophagic pathway might decrease copper toxicity in patients with WD.


Asunto(s)
Apoptosis , Autofagia/genética , ATPasas Transportadoras de Cobre/genética , Hepatocitos/fisiología , Degeneración Hepatolenticular/fisiopatología , Hígado/fisiopatología , Animales , Autofagosomas/ultraestructura , Autofagia/efectos de los fármacos , Factores de Transcripción Básicos con Cremalleras de Leucinas y Motivos Hélice-Asa-Hélice/metabolismo , Bencilaminas/farmacología , Supervivencia Celular , Cobre/toxicidad , ATPasas Transportadoras de Cobre/metabolismo , Femenino , Células Hep G2 , Hepatocitos/ultraestructura , Humanos , Masculino , Ratones , Ratones Noqueados , Microscopía Confocal , Microscopía Electrónica , Mitocondrias/ultraestructura , Transporte de Proteínas , Quinazolinas/farmacología , Ratas , Transducción de Señal , Serina-Treonina Quinasas TOR/metabolismo
5.
Int J Mol Sci ; 21(22)2020 Nov 12.
Artículo en Inglés | MEDLINE | ID: mdl-33198325

RESUMEN

Biofilms consist of a complex microbial community adhering to biotic or abiotic surfaces and enclosed within a protein/polysaccharide self-produced matrix. The formation of this structure represents the most important adaptive mechanism that leads to antibacterial resistance, and therefore, closely connected to pathogenicity. Antimicrobial peptides (AMPs) could represent attractive candidates for the design of new antibiotics because of their specific characteristics. AMPs show a broad activity spectrum, a relative selectivity towards their targets (microbial membranes), the ability to act on both proliferative and quiescent cells, a rapid mechanism of action, and above all, a low propensity for developing resistance. This article investigates the effect at subMIC concentrations of Temporin-L (TL) on biofilm formation in Pseudomonas fluorescens (P. fluorescens) both in static and dynamic conditions, showing that TL displays antibiofilm properties. Biofilm formation in static conditions was analyzed by the Crystal Violet assay. Investigation of biofilms in dynamic conditions was performed in a commercial microfluidic device consisting of a microflow chamber to simulate real flow conditions in the human body. Biofilm morphology was examined using Confocal Laser Scanning Microscopy and quantified via image analysis. The investigation of TL effects on P. fluorescens showed that when subMIC concentrations of this peptide were added during bacterial growth, TL exerted antibiofilm activity, impairing biofilm formation both in static and dynamic conditions. Moreover, TL also affects mature biofilm as confocal microscopy analyses showed that a large portion of preformed biofilm architecture was clearly perturbed by the peptide addition with a significative decrease of all the biofilm surface properties and the overall biomass. Finally, in these conditions, TL did not affect bacterial cells as the live/dead cell ratio remained unchanged without any increase in damaged cells, confirming an actual antibiofilm activity of the peptide.


Asunto(s)
Péptidos Catiónicos Antimicrobianos/farmacología , Biopelículas/efectos de los fármacos , Polisacáridos Bacterianos/química , Pseudomonas fluorescens/efectos de los fármacos , Antibacterianos/farmacología , Adhesión Bacteriana/efectos de los fármacos , Biomasa , Farmacorresistencia Bacteriana/efectos de los fármacos , Pruebas de Sensibilidad Microbiana , Microfluídica , Microscopía Confocal , Polímeros/química , Resistencia al Corte , Estrés Mecánico , Propiedades de Superficie
6.
Sci Rep ; 12(1): 6268, 2022 04 15.
Artículo en Inglés | MEDLINE | ID: mdl-35428750

RESUMEN

Rotavirus (RV) is the leading cause of acute gastroenteritis-associated mortality in early childhood. Emerging clinical evidence suggest the efficacy of the postbiotic approach based on cow's milk fermentation with the probiotic Lacticaseibacillus paracasei CBAL74 (FM-CBAL74) in preventing pediatric acute gastroenteritis, but the mechanisms of action are still poorly characterized. We evaluated the protective action of FM-CBAL74 in an in vitro model of RV infection in human enterocytes. The number of infected cells together with the relevant aspects of RV infection were assessed: epithelial barrier damage (tight-junction proteins and transepithelial electrical resistance evaluation), and inflammation (reactive oxygen species, pro-inflammatory cytokines IL-6, IL-8 and TNF-α, and mitogen-activated protein kinase pathway activation). Pre-incubation with FM-CBA L74 resulted in an inhibition of epithelial barrier damage and inflammation mediated by mitogen-activated protein kinase pathway activation induced by RV infection. Modulating several protective mechanisms, the postbiotic FM-CBAL74 exerted a preventive action against RV infection. This approach could be a disrupting nutritional strategy against one of the most common killers for the pediatric age.


Asunto(s)
Gastroenteritis , Infecciones por Rotavirus , Rotavirus , Animales , Bovinos , Niño , Preescolar , Enterocitos , Femenino , Fermentación , Gastroenteritis/prevención & control , Humanos , Inflamación , Leche , Proteínas Quinasas Activadas por Mitógenos , Infecciones por Rotavirus/prevención & control
7.
Cell Biosci ; 12(1): 182, 2022 Nov 08.
Artículo en Inglés | MEDLINE | ID: mdl-36348448

RESUMEN

BACKGROUND: Semaphorins (Sema) belong to a large family of repellent guidance cues instrumental in guiding axons during development. In particular, Class 3 Sema (Sema 3) is among the best characterized Sema family members and the only produced as secreted proteins in mammals, thereby exerting both autocrine and paracrine functions. Intriguingly, an increasing number of studies supports the crucial role of the Sema 3A in hippocampal and cortical neurodevelopment. This means that alterations in Sema 3A signaling might compromise hippocampal and cortical circuits and predispose to disorders such as autism and schizophrenia. Consistently, increased Sema 3A levels have been detected in brain of patients with schizophrenia and many polymorphisms in Sema 3A or in the Sema 3A receptors, Neuropilins (Npn 1 and 2) and Plexin As (Plxn As), have been associated to autism. RESULTS: Here we present data indicating that when overexpressed, Sema 3A causes human neural progenitors (NP) axonal retraction and an aberrant dendritic arborization. Similarly, Sema 3A, when overexpressed in human microglia, triggers proinflammatory processes that are highly detrimental to themselves as well as NP. Indeed, NP incubated in microglia overexpressing Sema 3A media retract axons within an hour and then start suffering and finally die. Sema 3A mediated retraction appears to be related to its binding to Npn 1 and Plxn A2 receptors, thus activating the downstream Fyn tyrosine kinase pathway that promotes the threonine-serine kinase cyclin-dependent kinase 5, CDK5, phosphorylation at the Tyr15 residue and the CDK5 processing to generate the active fragment p35. CONCLUSIONS: All together this study identifies Sema 3A as a critical regulator of human NP differentiation. This may imply that an insult due to Sema 3A overexpression during the early phases of neuronal development might compromise neuronal organization and connectivity and make neurons perhaps more vulnerable to other insults across their lifespan.

8.
Cell Rep ; 41(6): 111601, 2022 11 08.
Artículo en Inglés | MEDLINE | ID: mdl-36351409

RESUMEN

Melanoma is a deadly form of cancer characterized by remarkable therapy resistance. Analyzing the transcriptome of MAPK inhibitor sensitive- and resistant-melanoma, we discovered that APAF-1 is negatively regulated by MITF in resistant tumors. This study identifies the MITF/APAF-1 axis as a molecular driver of MAPK inhibitor resistance. A drug-repositioning screen identified quinacrine and methylbenzethonium as potent activators of apoptosis in a context that mimics drug resistance mediated by APAF-1 inactivation. The compounds showed anti-tumor activity in in vitro and in vivo models, linked to suppression of MITF function. Both drugs profoundly sensitize melanoma cells to MAPK inhibitors, regulating key signaling networks in melanoma, including the MITF/APAF-1 axis. Significant activity of the two compounds in inhibiting specific epigenetic modulators of MITF/APAF-1 expression, such as histone deacetylases, was observed. In summary, we demonstrate that targeting the MITF/APAF-1 axis may overcome resistance and could be exploited as a potential therapeutic approach to treat resistant melanoma.


Asunto(s)
Melanoma , Terapia Recuperativa , Humanos , Apoptosis , Línea Celular Tumoral , Regulación Neoplásica de la Expresión Génica , Melanoma/patología , Factor de Transcripción Asociado a Microftalmía/metabolismo , Inhibidores de Proteínas Quinasas/farmacología , Inhibidores de Proteínas Quinasas/uso terapéutico
9.
J Funct Foods ; 87: 104787, 2021 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-34630633

RESUMEN

Fermented foods have been proposed in limiting SARS-CoV-2 infection. Emerging evidence suggest the efficacy of cow's milk fermented with the probiotic L. paracasei CBAL74 (FM-CBAL74) in preventing infectious diseases. We evaluated the protective action of FM-CBAL74 against SARS-CoV-2 infection in human enterocytes. Relevant aspects of SARS-CoV-2 infection were assessed: infectivity, host functional receptor angiotensin-converting enzyme-2 (ACE2), transmembrane protease serine 2 (TMPRSS2), and pro-inflammatory cytokines expression (IL-6, IL-15, IL-1ß, VEGFß, TNF-α, MCP-1, CXCL1). Pre-incubation with FM-CBA L74 reduced the number of infected cells. The expression of ACE2 and the pro-inflammatory cytokines IL-6, VEGFß, IL-15, IL-1ß was downregulated by the pre-treatment with this fermented food. No effect on TMPRSS2, MCP-1, TNF-α and CXCL1 expression was observed. Modulating the crucial aspects of the infection, the fermented food FM-CBAL74 exerts a preventive action against SARS-CoV-2. These evidence could pave the way to innovative nutritional strategy to mitigate the COVID-19.

10.
Kardiochir Torakochirurgia Pol ; 17(2): 94-100, 2020 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-32728372

RESUMEN

INTRODUCTION: Loss of physical activity and pulmonary dysfunction with its associated complications represent two of the most important causes of morbidity and mortality following cardiac surgery. AIM: To evaluate whether a physiotherapy program based on respiratory training with or without musculoskeletal mobilization, started preoperatively, may provide a significant improvement in pulmonary and musculoskeletal recovery postoperatively in a sufficiently large sample of patients undergoing elective cardiac surgery. MATERIAL AND METHODS: One-hundred and two patients with similar baseline and preoperative characteristics were assigned to a preoperative respiratory physiotherapy protocol (group R, n = 34), a preoperative respiratory and motor physiotherapy protocol (group R + M, n = 34), or no preoperative specific physiotherapy protocol but only a simplified perioperative standard physiotherapy protocol (control group, C, n = 34). Data on 6-minute walking test, peak expiratory flow, and from blood gas analysis were retrospectively analyzed. RESULTS: As compared with group C, a statistically significant improvement was observed in the two preoperatively treated groups in terms of 1) better pre- (+0.7-0.8 Lt/min, p < 0.05) and postoperative (+1 Lt/min, p < 0.01) peak expiratory flow values; 2) longer pre- (+50-100 m, p < 0.01) and postoperative (+65-170 m, p < 0.01) distance traveled in the 6-minute walking test; 3) better PaO2, SaO2, pH value in postoperative blood gas measurements (p < 0.05, for all comparisons); 4) reduction of postoperative length of in-hospital stay (p < 0.05). CONCLUSIONS: A benefit of combined respiratory and motor physiotherapy protocols can be expected in the groups of patients preoperatively treated, especially with the respiratory one, either before or after cardiac surgery with a faster recovery of physical-functional activities. Specifically, the motor protocol is associated with greater autonomy of running before or after cardiac surgery.

11.
Stem Cell Reports ; 15(6): 1317-1332, 2020 12 08.
Artículo en Inglés | MEDLINE | ID: mdl-33296675

RESUMEN

Methyl-CpG binding protein 2 (MeCP2) has historically been linked to heterochromatin organization, and in mouse cells it accumulates at pericentric heterochromatin (PCH), closely following major satellite (MajSat) DNA distribution. However, little is known about the specific function of MeCP2 in these regions. We describe the first evidence of a role in neurons for MeCP2 and MajSat forward (MajSat-fw) RNA in reciprocal targeting to PCH through their physical interaction. Moreover, MeCP2 contributes to maintenance of PCH by promoting deposition of H3K9me3 and H4K20me3. We highlight that the MeCP2B isoform is required for correct higher-order PCH organization, and underline involvement of the methyl-binding and transcriptional repression domains. The T158 residue, which is commonly mutated in Rett patients, is directly involved in this process. Our findings support the hypothesis that MeCP2 and the MajSat-fw transcript are mutually dependent for PCH organization, and contribute to clarify MeCP2 function in the regulation of chromatin architecture.


Asunto(s)
ADN Satélite/metabolismo , Heterocromatina/metabolismo , Histonas/metabolismo , Proteína 2 de Unión a Metil-CpG/metabolismo , Células Madre Embrionarias de Ratones/metabolismo , Animales , ADN Satélite/genética , Heterocromatina/genética , Histonas/genética , Proteína 2 de Unión a Metil-CpG/genética , Ratones
12.
Kardiochir Torakochirurgia Pol ; 16(2): 81-87, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31410095

RESUMEN

INTRODUCTION: Loss of physical activity and pulmonary dysfunction with its associated complications represent two of the most important causes of morbidity and mortality following cardiac surgery. Few studies have investigated the effects of preoperative interventions targeted at improving cardiorespiratory and musculoskeletal function in the postoperative period. AIM: To evaluate whether a physiotherapy program based on respiratory training with or without musculoskeletal mobilization, started preoperatively, may provide a significant improvement in pulmonary and musculoskeletal recovery postoperatively in patients undergoing elective cardiac surgery. MATERIAL AND METHODS: Patients with similar baseline and preoperative characteristics were randomly assigned to a preoperative respiratory physiotherapy protocol (group A), a preoperative respiratory and motor physiotherapy protocol (group B), or no preoperative specific physiotherapy protocol but only a simplified perioperative standard physiotherapy protocol (control group or group C). Group A consisted of 19 patients, group B of 20, group C of 20. Data on 6-minute walking test, peak expiratory flow, and from blood gas analysis were retrospectively analyzed. RESULTS: As compared with group C, a statistically significant improvement was observed in the two preoperatively treated groups A and B in terms of longer pre- and postoperative distance traveled at the 6-minute walking test, better pre- and postoperative peak expiratory flow value, and better PaO2 and SaO2 values in postoperative blood gas measurements (p < 0.05, for all comparisons). A statistically significant reduction of the postoperative length of in-hospital stay was also observed in group B. CONCLUSIONS: As compared with the control group, substantially better clinical results for respiratory and musculoskeletal function were found in the groups preoperatively treated with physiotherapeutic protocols immediately before as well as after cardiac surgery.

13.
EMBO Mol Med ; 11(5)2019 05.
Artículo en Inglés | MEDLINE | ID: mdl-30979712

RESUMEN

Mitochondrial diseases (MDs) are a heterogeneous group of devastating and often fatal disorders due to defective oxidative phosphorylation. Despite the recent advances in mitochondrial medicine, effective therapies are still not available for these conditions. Here, we demonstrate that the microRNAs miR-181a and miR-181b (miR-181a/b) regulate key genes involved in mitochondrial biogenesis and function and that downregulation of these miRNAs enhances mitochondrial turnover in the retina through the coordinated activation of mitochondrial biogenesis and mitophagy. We thus tested the effect of miR-181a/b inactivation in different animal models of MDs, such as microphthalmia with linear skin lesions and Leber's hereditary optic neuropathy. We found that miR-181a/b downregulation strongly protects retinal neurons from cell death and significantly ameliorates the disease phenotype in all tested models. Altogether, our results demonstrate that miR-181a/b regulate mitochondrial homeostasis and that these miRNAs may be effective gene-independent therapeutic targets for MDs characterized by neuronal degeneration.


Asunto(s)
Regulación hacia Abajo/genética , MicroARNs/metabolismo , Mitocondrias/patología , Enfermedades Mitocondriales/genética , Animales , Autofagia/genética , Muerte Celular , Línea Celular , Citoprotección , Modelos Animales de Enfermedad , Complejo I de Transporte de Electrón/deficiencia , Complejo I de Transporte de Electrón/metabolismo , Femenino , Humanos , Masculino , Ratones , MicroARNs/genética , Mitocondrias/ultraestructura , Enfermedades Mitocondriales/patología , Dinámicas Mitocondriales/genética , Modelos Biológicos , Biogénesis de Organelos , Oryzias , Fenotipo , Células Ganglionares de la Retina/metabolismo , Células Ganglionares de la Retina/patología
15.
EMBO Mol Med ; 5(2): 280-93, 2013 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-23239471

RESUMEN

Mitochondrial-dependent (intrinsic) programmed cell death (PCD) is an essential homoeostatic mechanism that selects bioenergetically proficient cells suitable for tissue/organ development. However, the link between mitochondrial dysfunction, intrinsic apoptosis and developmental anomalies has not been demonstrated to date. Now we provide the evidence that non-canonical mitochondrial dependent apoptosis explains the phenotype of microphthalmia with linear skin lesions (MLS), an X-linked developmental disorder caused by mutations in the holocytochrome c-type synthase (HCCS)gene [corrected]. By taking advantage of a medaka model that recapitulates the MLS phenotype we demonstrate that downregulation of hccs, an essential player of the mitochondrial respiratory chain (MRC), causes increased cell death via an apoptosome-independent caspase-9 activation in brain and eyes. We also show that the unconventional activation of caspase-9 occurs in the mitochondria and is triggered by MRC impairment and overproduction of reactive oxygen species (ROS). We thus propose that HCCS plays a key role in central nervous system (CNS) development by modulating a novel non-canonical start-up of cell death and provide the first experimental evidence for a mechanistic link between mitochondrial dysfunction, intrinsic apoptosis and developmental disorders.


Asunto(s)
Apoptosis , Encéfalo/citología , Ojo/citología , Proteínas de Peces/metabolismo , Liasas/metabolismo , Microftalmía/enzimología , Oryzias/genética , Animales , Encéfalo/enzimología , Caspasa 9/genética , Caspasa 9/metabolismo , Citocromos c/metabolismo , Modelos Animales de Enfermedad , Ojo/enzimología , Femenino , Proteínas de Peces/genética , Técnicas de Silenciamiento del Gen , Humanos , Liasas/genética , Masculino , Microftalmía/genética , Microftalmía/fisiopatología , Oryzias/metabolismo
16.
Clin Exp Metastasis ; 30(1): 47-68, 2013 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-22760522

RESUMEN

Dipyridamole is a widely prescribed drug in ischemic disorders, and it is here investigated for potential clinical use as a new treatment for breast cancer. Xenograft mice bearing triple-negative breast cancer 4T1-Luc or MDA-MB-231T cells were generated. In these in vivo models, dipyridamole effects were investigated for primary tumor growth, metastasis formation, cell cycle, apoptosis, signaling pathways, immune cell infiltration, and serum inflammatory cytokines levels. Dipyridamole significantly reduced primary tumor growth and metastasis formation by intraperitoneal administration. Treatment with 15 mg/kg/day dipyridamole reduced mean primary tumor size by 67.5 % (p = 0.0433), while treatment with 30 mg/kg/day dipyridamole resulted in an almost a total reduction in primary tumors (p = 0.0182). Experimental metastasis assays show dipyridamole reduces metastasis formation by 47.5 % in the MDA-MB-231T xenograft model (p = 0.0122), and by 50.26 % in the 4T1-Luc xenograft model (p = 0.0292). In vivo dipyridamole decreased activated ß-catenin by 38.64 % (p < 0.0001), phospho-ERK1/2 by 25.05 % (p = 0.0129), phospho-p65 by 67.82 % (p < 0.0001) and doubled the expression of IkBα (p = 0.0019), thus revealing significant effects on Wnt, ERK1/2-MAPK and NF-kB pathways in both animal models. Moreover dipyridamole significantly decreased the infiltration of tumor-associated macrophages and myeloid-derived suppressor cells in primary tumors (p < 0.005), and the inflammatory cytokines levels in the sera of the treated mice. We suggest that when used at appropriate doses and with the correct mode of administration, dipyridamole is a promising agent for breast-cancer treatment, thus also implying its potential use in other cancers that show those highly activated pathways.


Asunto(s)
Neoplasias de la Mama/prevención & control , Dipiridamol/uso terapéutico , Neoplasias Pulmonares/prevención & control , Inhibidores de Fosfodiesterasa/uso terapéutico , Receptor ErbB-2/metabolismo , Receptores de Estrógenos/metabolismo , Receptores de Progesterona/metabolismo , Animales , Apoptosis/efectos de los fármacos , Western Blotting , Neoplasias de la Mama/metabolismo , Neoplasias de la Mama/patología , Adhesión Celular/efectos de los fármacos , Ciclo Celular/efectos de los fármacos , Línea Celular Tumoral , Movimiento Celular/efectos de los fármacos , Proliferación Celular/efectos de los fármacos , Progresión de la Enfermedad , Ensayo de Inmunoadsorción Enzimática , Femenino , Citometría de Flujo , Humanos , Técnicas para Inmunoenzimas , Neoplasias Pulmonares/metabolismo , Neoplasias Pulmonares/secundario , Ratones , Ratones Endogámicos BALB C , Ratones Desnudos , Proteína Quinasa 1 Activada por Mitógenos/genética , Proteína Quinasa 1 Activada por Mitógenos/metabolismo , Proteína Quinasa 3 Activada por Mitógenos/genética , Proteína Quinasa 3 Activada por Mitógenos/metabolismo , FN-kappa B/genética , FN-kappa B/metabolismo , ARN Mensajero/genética , Reacción en Cadena en Tiempo Real de la Polimerasa , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Transducción de Señal , Ensayos Antitumor por Modelo de Xenoinjerto , beta Catenina/genética , beta Catenina/metabolismo
17.
Eur J Oncol Nurs ; 16(2): 158-64, 2012 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-21601523

RESUMEN

PURPOSE: Although the profile of the problems and risks associated with cancer patients has expanded over the past few years, and so has our available knowledge on the concordance between patients and nurses, there is a lack of evidence concerning neurosurgical patients. In comparison with patients who have neoplasm located in other lobes, those with frontal lobe cancer can suffer from personality changes, disinhibition, apathy, and higher-order attentional difficulties. Such behavior may give rise to a stigma, and consequently, pose a risk to have their problems misunderstood by caregivers, and be at greater risk than they are perceived to be. OBJECTIVE: To explore the risk of nurses underestimating the problems of patients who were operated on for frontal neoplasm, compared to patients suffering from neoplasms located in other cerebral lobes. METHODS: A prospective study was undertaken in 2008 in Italy. Patients admitted to the hospital with brain neoplasm were eligible for the study. For each patient with a frontal lobe neoplasm, a corresponding patient with a cerebral neoplasm located in either the temporal, parietal or occipital lobes was also included. Nurses working in the units involved and providing care to these patients were also included. On the afternoon of the 2nd postoperative day, the researcher interviewed both the patients, and the registered nurses (RNs) responsible for the patients' care, in regards to pain intensity, dependence in activities of daily living, anxiety and depression, and fear of falling, as each was perceived by patients and nurses. The level of concordance between the patients' and nurses' responses was calculated. RESULTS: Forty-six patients were considered (mean age 53.5 years); 23 had surgery for a frontal brain neoplasm and 23 for brain neoplasms located in either the temporal, parietal, or occipital areas. Overall, patients operated on for frontal lobe neoplasms had much of the same risks of underestimation of their problems, as patients with other cerebral neoplasms. CONCLUSIONS: Patients with frontal lobe neoplasms seemed, overall, to run the same risk of their problems being underestimated as patients with cerebral neoplasms located at other sites. Neurosurgical nurses tended to overestimate patients' problems, particularly in cases with neoplasms not located in the frontal lobe. This unexpected finding needs to be addressed with further research, and might warrant a different approach to caring for patients with frontal lobe neoplasms, whose problems are overestimated less, so that they might receive less supportive care.


Asunto(s)
Neoplasias Encefálicas/enfermería , Lóbulo Frontal , Evaluación en Enfermería/normas , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Masculino , Persona de Mediana Edad , Investigación en Evaluación de Enfermería , Estudios Prospectivos , Medición de Riesgo , Adulto Joven
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