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1.
Am J Hum Genet ; 109(10): 1828-1849, 2022 10 06.
Artículo en Inglés | MEDLINE | ID: mdl-36084634

RESUMEN

Orofaciodigital syndrome (OFD) is a genetically heterogeneous ciliopathy characterized by anomalies of the oral cavity, face, and digits. We describe individuals with OFD from three unrelated families having bi-allelic loss-of-function variants in SCNM1 as the cause of their condition. SCNM1 encodes a protein recently shown to be a component of the human minor spliceosome. However, so far the effect of loss of SCNM1 function on human cells had not been assessed. Using a comparative transcriptome analysis between fibroblasts derived from an OFD-affected individual harboring SCNM1 mutations and control fibroblasts, we identified a set of genes with defective minor intron (U12) processing in the fibroblasts of the affected subject. These results were reproduced in SCNM1 knockout hTERT RPE-1 (RPE-1) cells engineered by CRISPR-Cas9-mediated editing and in SCNM1 siRNA-treated RPE-1 cultures. Notably, expression of TMEM107 and FAM92A encoding primary cilia and basal body proteins, respectively, and that of DERL2, ZC3H8, and C17orf75, were severely reduced in SCNM1-deficient cells. Primary fibroblasts containing SCNM1 mutations, as well as SCNM1 knockout and SCNM1 knockdown RPE-1 cells, were also found with abnormally elongated cilia. Conversely, cilia length and expression of SCNM1-regulated genes were restored in SCNM1-deficient fibroblasts following reintroduction of SCNM1 via retroviral delivery. Additionally, functional analysis in SCNM1-retrotransduced fibroblasts showed that SCNM1 is a positive mediator of Hedgehog (Hh) signaling. Our findings demonstrate that defective U12 intron splicing can lead to a typical ciliopathy such as OFD and reveal that primary cilia length and Hh signaling are regulated by the minor spliceosome through SCNM1 activity.


Asunto(s)
Ciliopatías , Síndromes Orofaciodigitales , Cilios/genética , Cilios/metabolismo , Ciliopatías/genética , Proteínas Hedgehog/metabolismo , Humanos , Intrones/genética , Mutación/genética , Síndromes Orofaciodigitales/genética , Empalme del ARN/genética , Factores de Empalme de ARN/metabolismo , ARN Interferente Pequeño/metabolismo , Empalmosomas/genética , Empalmosomas/metabolismo
2.
J Med Genet ; 61(7): 633-644, 2024 Jun 20.
Artículo en Inglés | MEDLINE | ID: mdl-38531627

RESUMEN

BACKGROUND: Ellis-van Creveld syndrome (EvC) is a recessive disorder characterised by acromesomelic limb shortening, postaxial polydactyly, nail-teeth dysplasia and congenital cardiac defects, primarily caused by pathogenic variants in EVC or EVC2. Weyers acrofacial dysostosis (WAD) is an ultra-rare dominant condition allelic to EvC. The present work aimed to enhance current knowledge on the clinical manifestations of EvC and WAD and broaden their mutational spectrum. METHODS: We conducted molecular studies in 46 individuals from 43 unrelated families with a preliminary clinical diagnosis of EvC and 3 affected individuals from a family with WAD and retrospectively analysed clinical data. The deleterious effect of selected variants of uncertain significance was evaluated by cellular assays. MAIN RESULTS: We identified pathogenic variants in EVC/EVC2 in affected individuals from 41 of the 43 families with EvC. Patients from each of the two remaining families were found with a homozygous splicing variant in WDR35 and a de novo heterozygous frameshift variant in GLI3, respectively. The phenotype of these patients showed a remarkable overlap with EvC. A novel EVC2 C-terminal truncating variant was identified in the family with WAD. Deep phenotyping of the cohort recapitulated 'classical EvC findings' in the literature and highlighted findings previously undescribed or rarely described as part of EvC. CONCLUSIONS: This study presents the largest cohort of living patients with EvC to date, contributing to better understanding of the full clinical spectrum of EvC. We also provide comprehensive information on the EVC/EVC2 mutational landscape and add GLI3 to the list of genes associated with EvC-like phenotypes.


Asunto(s)
Síndrome de Ellis-Van Creveld , Linaje , Fenotipo , Humanos , Síndrome de Ellis-Van Creveld/genética , Síndrome de Ellis-Van Creveld/patología , Masculino , Femenino , Niño , Proteínas de la Membrana/genética , Mutación , Preescolar , Proteína Gli3 con Dedos de Zinc/genética , Adolescente , Adulto , Proteínas del Tejido Nervioso/genética , Estudios de Cohortes , Lactante , Proteínas/genética , Estudios Retrospectivos , Péptidos y Proteínas de Señalización Intercelular
3.
J Surg Res ; 301: 455-460, 2024 Jul 20.
Artículo en Inglés | MEDLINE | ID: mdl-39033596

RESUMEN

INTRODUCTION: Laparoscopy has demonstrated improved outcomes in abdominal surgery; however, its use in trauma has been less compelling. In this study, we hypothesize that laparoscopy may be observed to have lower costs and complications with similar operative times compared to open exploration in appropriately selected patients. METHODS: We retrospectively reviewed adult patients undergoing abdominal exploration after blunt and penetrating trauma at our level 1 center from 2008 to 2020. Data included mechanism, operative time, length of stay (LOS), hospital charges, and complications. Patients were grouped as follows: therapeutic and nontherapeutic diagnostic laparoscopy and celiotomy. Therapeutic procedures included suture repair of hollow viscus organs or diaphragm, evacuation of hematoma, and hemorrhage control of solid organ or mesenteric injury. Unstable patients, repair of major vascular injuries or resection of an organ or bowel were excluded. RESULTS: Two hundred ninety-six patients were included with comparable demographics. Diagnostic laparoscopy had shorter operative times, LOS, and lower hospital charges compared to diagnostic celiotomy controls. Similarly, therapeutic laparoscopy had shorter LOS and lower hospital costs compared to therapeutic celiotomy. The operative time was not statistically different in this comparison. Patients in the celiotomy groups had more postoperative complications. The differences in operative time, LOS and hospital charges were not statistically significant in the diagnostic laparoscopy compared to diagnostic laparoscopy converted to diagnostic celiotomy group, nor in the therapeutic laparoscopy compared to the diagnostic laparoscopy converted to therapeutic laparoscopy group. CONCLUSIONS: Laparoscopy can be used safely in penetrating and blunt abdominal trauma. In this cohort, laparoscopy was observed to have shorter operative times and LOS with lower hospital charges and fewer complications.

4.
Sensors (Basel) ; 24(4)2024 Feb 16.
Artículo en Inglés | MEDLINE | ID: mdl-38400415

RESUMEN

AIM: The aim of our study was to investigate skin conditions when wearing and removing a novel wireless non-adhesive cardiorespiratory monitoring device for neonates (Bambi-Belt) compared to standard adhesive electrodes. STUDY DESIGN: This was a prospective study including preterm neonates requiring cardiorespiratory monitoring. Besides standard electrodes, the infants wore a Bambi Belt for 10 consecutive days. Their skin conditions were assessed using Trans Epidermal Water Loss (TEWL) and the Neonatal Skin Condition Score (NSCS) after daily belt and standard electrode removal. The ∆TEWL was calculated as the difference between the TEWL at the device's location (Bambi-Belt/standard electrode) and the adjacent control skin location, with a higher ∆TEWL indicating skin damage. RESULTS: A total of 15 infants (gestational age (GA): 24.1-35.6 wk) were analyzed. The ΔTEWL significantly increased directly after electrode removal (10.95 ± 9.98 g/m2/h) compared to belt removal (5.18 ± 6.71 g/m2/h; F: 8.73, p = 0.004) and after the washout period (3.72 ± 5.46 g/m2/h vs. 1.86 ± 3.35 g/m2/h; F: 2.84, p = 0.09), although the latter did not reach statistical significance. The TEWL was not influenced by prolonged belt wearing. No significant differences in the NSCS score were found between the belt and electrode (OR: 0.69, 95% CI [0.17, 2.88], p = 0.6). CONCLUSION: A new wireless non-adhesive device for neonatal cardiorespiratory monitoring was well tolerated in preterm infants and may be less damaging during prolonged wearing.


Asunto(s)
Recien Nacido Prematuro , Enfermedades de la Piel , Humanos , Recién Nacido , Estudios Prospectivos , Piel , Edad Gestacional , Agua
5.
Am J Hum Genet ; 107(5): 989-999, 2020 11 05.
Artículo en Inglés | MEDLINE | ID: mdl-33053334

RESUMEN

Osteogenesis imperfecta (OI) is characterized primarily by susceptibility to fractures with or without bone deformation. OI is genetically heterogeneous: over 20 genetic causes are recognized. We identified bi-allelic pathogenic KDELR2 variants as a cause of OI in four families. KDELR2 encodes KDEL endoplasmic reticulum protein retention receptor 2, which recycles ER-resident proteins with a KDEL-like peptide from the cis-Golgi to the ER through COPI retrograde transport. Analysis of patient primary fibroblasts showed intracellular decrease of HSP47 and FKBP65 along with reduced procollagen type I in culture media. Electron microscopy identified an abnormal quality of secreted collagen fibrils with increased amount of HSP47 bound to monomeric and multimeric collagen molecules. Mapping the identified KDELR2 variants onto the crystal structure of G. gallus KDELR2 indicated that these lead to an inactive receptor resulting in impaired KDELR2-mediated Golgi-ER transport. Therefore, in KDELR2-deficient individuals, OI most likely occurs because of the inability of HSP47 to bind KDELR2 and dissociate from collagen type I. Instead, HSP47 remains bound to collagen molecules extracellularly, disrupting fiber formation. This highlights the importance of intracellular recycling of ER-resident molecular chaperones for collagen type I and bone metabolism and a crucial role of HSP47 in the KDELR2-associated pathogenic mechanism leading to OI.


Asunto(s)
Huesos/metabolismo , Colágeno Tipo I/metabolismo , Proteínas del Choque Térmico HSP47/metabolismo , Osteogénesis Imperfecta/genética , Proteínas de Transporte Vesicular/metabolismo , Adulto , Alelos , Secuencia de Aminoácidos , Animales , Sitios de Unión , Huesos/patología , Pollos , Preescolar , Colágeno Tipo I/química , Colágeno Tipo I/genética , Retículo Endoplásmico/metabolismo , Retículo Endoplásmico/patología , Femenino , Fibroblastos/metabolismo , Fibroblastos/patología , Expresión Génica , Aparato de Golgi/metabolismo , Aparato de Golgi/patología , Proteínas del Choque Térmico HSP47/química , Proteínas del Choque Térmico HSP47/genética , Humanos , Lactante , Masculino , Osteogénesis Imperfecta/diagnóstico , Osteogénesis Imperfecta/metabolismo , Osteogénesis Imperfecta/patología , Linaje , Cultivo Primario de Células , Unión Proteica , Dominios y Motivos de Interacción de Proteínas , Estructura Secundaria de Proteína , Transporte de Proteínas , Alineación de Secuencia , Homología de Secuencia de Aminoácido , Proteínas de Transporte Vesicular/química , Proteínas de Transporte Vesicular/genética
6.
Appl Environ Microbiol ; 89(2): e0183822, 2023 02 28.
Artículo en Inglés | MEDLINE | ID: mdl-36700628

RESUMEN

Symbiotic Actinobacteria help fungus-growing ants suppress fungal pathogens through the production of antifungal compounds. Trachymyrmex ants of the southwest desert of the United States inhabit a unique niche far from the tropical rainforests in which most fungus-growing ant species are found. These ants may not encounter the specialist fungal pathogen Escovopsis known to threaten colonies of other fungus-growing ants. It is unknown whether Actinobacteria associated with these ants antagonize contaminant fungi and, if so, what the chemical basis of such antagonism is. We find that Pseudonocardia and Amycolatopsis strains isolated from three desert specialist Trachymyrmex species do antagonize diverse contaminant fungi isolated from field-collected ant colonies. We did not isolate the specialist fungal pathogen Escovopsis in our sampling. We trace strong antifungal activity from Amycolatopsis isolates to the molecule ECO-0501, an antibiotic that was previously under preclinical development as an antibacterial agent. In addition to suppression of contaminant fungi, we find that this molecule has strong activity against ant-associated Actinobacteria and may also play a role in bacterial competition in this niche. By studying interspecies interactions in a previously unexplored niche, we have uncovered novel bioactivity for a structurally unique antibiotic. IMPORTANCE Animal hosts often benefit from chemical defenses provided by microbes. These molecular defenses are a potential source of novel antibiotics and offer opportunities for understanding how antibiotics are used in ecological contexts with defined interspecies interactions. Here, we recover contaminant fungi from nests of Trachymyrmex fungus-growing ants of the southwest desert of the United States and find that they are suppressed by Actinobacteria isolated from these ants. The antibiotic ECO-0501 is an antifungal agent used by some of these Amycolatopsis bacterial isolates. This antibiotic was previously investigated in preclinical studies and known only for antibacterial activity.


Asunto(s)
Actinobacteria , Hormigas , Hypocreales , Animales , Antifúngicos/farmacología , Antibacterianos/farmacología , Hormigas/microbiología , Amycolatopsis , Simbiosis , Hongos
7.
J Surg Res ; 261: 33-38, 2021 05.
Artículo en Inglés | MEDLINE | ID: mdl-33412506

RESUMEN

BACKGROUND: Although there is evidence that self-inflicted abdominal stab wounds are less severe than those from assault, it is unclear if this is true in other anatomic regions. This study compares severity and injury pattern between self-inflicted stab wounds (SISWs) and wounds from assault (ASW). MATERIALS AND METHODS: Stab wounds from our level I trauma registry from 2013 to 2018 were reviewed. Data included age, gender, self-inflicted versus assault, psychiatric or substance use history, anatomic location, operative intervention, injury severity, length of stay, and outcomes. RESULTS: Over the study period, 1390 patients were identified. History of psychiatric diagnoses or previous suicide attempts was more frequent in SISWs (47% versus 6.5%, P < 0.01; 35% versus 0.4%, P < 0.01). SISWs had a higher incidence of wounds to the neck and abdomen (44% versus 11%, P < 0.01; and 34% versus 26%, P = 0.02). Overall, injuries from ASW had a higher injury severity score, but more procedures were performed on SISWs (46% versus 34%, P < 0.01). SISWs to the neck were more likely to undergo procedures (26% versus 15%, P = 0.04). Median hospital charges were higher in patients with SISWs ($58.6 K versus $39.4 K, P < 0.01). CONCLUSIONS: SISWs have a distinct pattern of injuries, more commonly to the neck and abdomen, when compared with injuries resulting from ASW. The patients with SISWs have a higher rate of procedures, longer length of stay, and higher hospital charges despite low injury severity overall.


Asunto(s)
Atención a la Salud/estadística & datos numéricos , Puntaje de Gravedad del Traumatismo , Conducta Autodestructiva , Violencia , Heridas Punzantes/epidemiología , Adulto , Femenino , Humanos , Masculino , Persona de Mediana Edad , Nevada/epidemiología , Estudios Retrospectivos , Heridas Punzantes/etiología , Heridas Punzantes/psicología , Adulto Joven
8.
Int J Mol Sci ; 22(23)2021 Dec 03.
Artículo en Inglés | MEDLINE | ID: mdl-34884915

RESUMEN

In Yarrowia lipolytica, expression of the genes encoding the enzymes of the N-acetylglucosamine (NAGA) utilization pathway (NAG genes) becomes independent of the presence of NAGA in a Ylnag5 mutant lacking NAGA kinase. We addressed the question of whether the altered transcription was due to a lack of kinase activity or to a moonlighting role of this protein. Glucosamine-6-phosphate deaminase (Nag1) activity was measured as a reporter of NAG genes expression. The NGT1 gene encoding the NAGA transporter was deleted, creating a Ylnag5 ngt1 strain. In glucose cultures of this strain, Nag1 activity was similar to that of the Ylnag5 strain, ruling out the possibility that NAGA derived from cell wall turnover could trigger the derepression. Heterologous NAGA kinases were expressed in a Ylnag5 strain. Among them, the protein from Arabidopsis thaliana did not restore kinase activity but lowered Nag1 activity 4-fold with respect to a control. Expression in the Ylnag5 strain of YlNag5 variants F320S or D214V with low kinase activity caused a repression similar to that of the wild-type protein. Together, these results indicate that YlNag5 behaves as a moonlighting protein. An RNA-seq analysis revealed that the Ylnag5 mutation had a limited transcriptomic effect besides derepression of the NAG genes.


Asunto(s)
Perfilación de la Expresión Génica/métodos , Fosfotransferasas (Aceptor de Grupo Alcohol)/genética , Fosfotransferasas (Aceptor de Grupo Alcohol)/metabolismo , Yarrowia/crecimiento & desarrollo , Arabidopsis/enzimología , Arabidopsis/genética , Clonación Molecular , Proteínas Fúngicas/genética , Proteínas Fúngicas/metabolismo , Regulación Fúngica de la Expresión Génica , Mutación , Análisis de Secuencia de ARN , Yarrowia/enzimología , Yarrowia/genética
9.
Clin Infect Dis ; 69(7): 1226-1228, 2019 09 13.
Artículo en Inglés | MEDLINE | ID: mdl-31220221

RESUMEN

Chagas disease (CD) in the United States is severely underdiagnosed, due to an absence of systematic screening as part of routine healthcare. We screened 189 relatives of 86 existing patients and found a CD prevalence of 7.4%. Screening close relatives of previously diagnosed individuals can effectively identify new CD cases.


Asunto(s)
Enfermedad de Chagas/epidemiología , Familia , Adulto , Enfermedad de Chagas/diagnóstico , Enfermedad de Chagas/etiología , Electrocardiografía , Femenino , Humanos , Los Angeles/epidemiología , Masculino , Tamizaje Masivo , Persona de Mediana Edad , Vigilancia de la Población , Prevalencia , Trypanosoma cruzi , Adulto Joven
10.
Proc Natl Acad Sci U S A ; 112(1): E65-72, 2015 Jan 06.
Artículo en Inglés | MEDLINE | ID: mdl-25535349

RESUMEN

Maintaining a proper balance between excitation and inhibition is essential for the functioning of neuronal networks. However, little is known about the mechanisms through which excitatory activity can affect inhibitory synapse plasticity. Here we used tagged gephyrin, one of the main scaffolding proteins of the postsynaptic density at GABAergic synapses, to monitor the activity-dependent adaptation of perisomatic inhibitory synapses over prolonged periods of time in hippocampal slice cultures. We find that learning-related activity patterns known to induce N-methyl-D-aspartate (NMDA) receptor-dependent long-term potentiation and transient optogenetic activation of single neurons induce within hours a robust increase in the formation and size of gephyrin-tagged clusters at inhibitory synapses identified by correlated confocal electron microscopy. This inhibitory morphological plasticity was associated with an increase in spontaneous inhibitory activity but did not require activation of GABAA receptors. Importantly, this activity-dependent inhibitory plasticity was prevented by pharmacological blockade of Ca(2+)/calmodulin-dependent protein kinase II (CaMKII), it was associated with an increased phosphorylation of gephyrin on a site targeted by CaMKII, and could be prevented or mimicked by gephyrin phospho-mutants for this site. These results reveal a homeostatic mechanism through which activity regulates the dynamics and function of perisomatic inhibitory synapses, and they identify a CaMKII-dependent phosphorylation site on gephyrin as critically important for this process.


Asunto(s)
Proteínas Portadoras/metabolismo , Proteínas de la Membrana/metabolismo , Inhibición Neural , Sinapsis/metabolismo , Animales , Proteína Quinasa Tipo 2 Dependiente de Calcio Calmodulina/metabolismo , Proteínas Portadoras/ultraestructura , Hipocampo/metabolismo , Proteínas de la Membrana/ultraestructura , Ratones , Inhibición Neural/efectos de los fármacos , Optogenética , Técnicas de Cultivo de Órganos , Fosforilación/efectos de los fármacos , Células Piramidales/efectos de los fármacos , Células Piramidales/metabolismo , Células Piramidales/ultraestructura , Piridazinas/farmacología , Ratas , Receptores de GABA-A/metabolismo , Sinapsis/efectos de los fármacos
11.
Rev Med Chil ; 145(9): 1172-1178, 2017 Sep.
Artículo en Español | MEDLINE | ID: mdl-29424405

RESUMEN

The study of the factors that regulate high energy food intake is especially relevant nowadays due to the high prevalence of overweight and obesity. Food intake regulation can be divided in two basic processes, namely satiation and satiety. Satiation is the process that determines the moment in which feeding stops and regulates the amount of ingested food during a single meal. Satiety is the interval between meals and regulates the time elapsed between two meals. The longer the interval, the lower energy intake. Each of these processes are regulated by different factors, which are here reviewed.


Asunto(s)
Regulación del Apetito/fisiología , Ingestión de Energía/fisiología , Saciedad/fisiología , Ingestión de Alimentos/fisiología , Humanos , Respuesta de Saciedad/fisiología , Sensación/fisiología , Factores de Tiempo
12.
Biochim Biophys Acta ; 1850(7): 1362-7, 2015 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-25810078

RESUMEN

BACKGROUND: A low level of glucose is required for maximal transcription of the SUC2 gene in Saccharomyces cerevisiae. Although the repressor Rgt1 binds the SUC2 promoter in gel-shift assays, it has been reported that Rgt1 has only minimal effects on SUC2 expression. Rgt1 acts together with Mth1 to repress the HXT genes encoding glucose transporters, and the release of Rgt1 from some HXT promoters requires cAMP-dependent protein kinase (PKA) activity. METHODS: The genes RGT1 and MTH1 have been disrupted and the SUC2 promoter modified in several S. cerevisiae backgrounds. Yeast cells were grown in different carbon sources in the presence or absence of 0.1 or 2% glucose, and invertase was assayed in whole cells. RESULTS: Galactose, glycerol or ethanol hindered invertase induction by low glucose, but lactate did not. During growth in lactate, deletion of RGT1 or MTH1 caused a marked increase in invertase levels, and elimination of the Rgt1-binding site in the SUC2 promoter caused also invertase induction. PKA activity decreased invertase levels in cells growing in lactate, and increased them during growth in lactate+0.1% glucose. CONCLUSIONS: The low level of expression of SUC2 in the absence of glucose is mainly due to repression by the Rgt1-Mth1 complex. Repression is dependent on PKA activity, but not on any specific Tpk isoenzyme. GENERAL SIGNIFICANCE: The results show that previously overlooked regulatory elements, such as Rgt1 and Tpks, participate in the control of SUC2 expression in S.cerevisiae.


Asunto(s)
Proteínas Quinasas Dependientes de AMP Cíclico/metabolismo , Proteínas de Unión al ADN/metabolismo , Proteínas de Saccharomyces cerevisiae/metabolismo , Saccharomyces cerevisiae/metabolismo , Factores de Transcripción/metabolismo , beta-Fructofuranosidasa/metabolismo , Proteínas Adaptadoras Transductoras de Señales/genética , Proteínas Adaptadoras Transductoras de Señales/metabolismo , Sitios de Unión/genética , Subunidades Catalíticas de Proteína Quinasa Dependientes de AMP Cíclico/genética , Subunidades Catalíticas de Proteína Quinasa Dependientes de AMP Cíclico/metabolismo , Proteínas Quinasas Dependientes de AMP Cíclico/genética , Proteínas de Unión al ADN/genética , Etanol/farmacología , Galactosa/farmacología , Regulación Enzimológica de la Expresión Génica/efectos de los fármacos , Regulación Fúngica de la Expresión Génica/efectos de los fármacos , Glucosa/farmacología , Isoenzimas/genética , Isoenzimas/metabolismo , Mutación , Regiones Promotoras Genéticas/genética , Saccharomyces cerevisiae/genética , Proteínas de Saccharomyces cerevisiae/genética , Factores de Transcripción/genética , beta-Fructofuranosidasa/genética
13.
Invest Clin ; 57(1): 13-24, 2016 Mar.
Artículo en Español | MEDLINE | ID: mdl-27382798

RESUMEN

The World Health Organization estimates that approximately 170 million people are chronically infected with hepatitis C virus (HCV). This study evaluated the presence of antibodies against HCV by two immunoassays. HCV genotypes were analyzed by phylogenetic analysis of viral genome fragments amplified from the 5 'non-coding (5'NC) region and non-structural region 5b (NS5b), using reverse transcription and nested polymerase chain reaction (RT-PCR), in patients referred from January 2010 to February 2013 to the Reference Laboratory of Public Health, University Hospital "Antonio Patricio de Alcalá". The prevalence of anti-HCV antibodies was 0.57% (17/3005), being the group of patients older than 41 years the most affected (0.9%). A total of 16 samples were found positive for HCV RNA by RT-PCR in the 5'NC region (16/17, 94%). Phylogenetic analysis of the 5'NC region allowed to identify the circulation of genotypes 2 and 1, and one genotype 3 and one 4. By phylogenetic analysis of the NS5b region, diverse subtypes of HCV genotype 2 were identified (2a, 2j and 2s). This finding is in accordance with previous studies that indicate that this genotype is relatively diverse in our country.


Asunto(s)
Hepacivirus/genética , Hepatitis C Crónica/virología , Adolescente , Adulto , Niño , Preescolar , Femenino , Genotipo , Hospitales Universitarios , Humanos , Lactante , Masculino , Filogenia , Salud Pública , Venezuela , Adulto Joven
14.
Proc Natl Acad Sci U S A ; 109(9): E573-82, 2012 Feb 28.
Artículo en Inglés | MEDLINE | ID: mdl-22323580

RESUMEN

Trafficking and turnover of transmitter receptors required to maintain and modify the strength of chemical synapses have been characterized extensively. In contrast, little is known regarding trafficking of gap junction components at electrical synapses. By combining ultrastructural and in vivo physiological analysis at identified mixed (electrical and chemical) synapses on the goldfish Mauthner cell, we show here that gap junction hemichannels are added at the edges of GJ plaques where they dock with hemichannels in the apposed membrane to form cell-cell channels and, simultaneously, that intact junctional regions are removed from centers of these plaques into either presynaptic axon or postsynaptic dendrite. Moreover, electrical coupling is readily modified by intradendritic application of peptides that interfere with endocytosis or exocytosis, suggesting that the strength of electrical synapses at these terminals is sustained, at least in part, by fast (in minutes) turnover of gap junction channels. A peptide corresponding to a region of the carboxy terminus that is conserved in Cx36 and its two teleost homologs appears to interfere with formation of new gap junction channels, presumably by reducing insertion of hemichannels on the dendritic side. Thus, our data indicate that electrical synapses are dynamic structures and that their channels are turned over actively, suggesting that regulated trafficking of connexons may contribute to the modification of gap junctional conductance.


Asunto(s)
Sinapsis Eléctricas/fisiología , Canales Iónicos/fisiología , Transmisión Sináptica/fisiología , Animales , Transporte Biológico , Comunicación Celular , Conexinas/química , Conexinas/fisiología , Sinapsis Eléctricas/efectos de los fármacos , Sinapsis Eléctricas/ultraestructura , Endocitosis/efectos de los fármacos , Exocitosis/efectos de los fármacos , Técnica de Fractura por Congelación , Carpa Dorada , Inmunohistoquímica , Canales Iónicos/efectos de los fármacos , Canales Iónicos/ultraestructura , Fusión de Membrana , Plasticidad Neuronal , Fragmentos de Péptidos/farmacología , Transporte de Proteínas , Proteínas SNARE/metabolismo , Proteína 25 Asociada a Sinaptosomas/química , Proteína delta-6 de Union Comunicante
15.
Biochim Biophys Acta ; 1828(1): 134-46, 2013 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-22659675

RESUMEN

The term synapse applies to cellular specializations that articulate the processing of information within neural circuits by providing a mechanism for the transfer of information between two different neurons. There are two main modalities of synaptic transmission: chemical and electrical. While most efforts have been dedicated to the understanding of the properties and modifiability of chemical transmission, less is still known regarding the plastic properties of electrical synapses, whose structural correlate is the gap junction. A wealth of data indicates that, rather than passive intercellular channels, electrical synapses are more dynamic and modifiable than was generally perceived. This article will discuss the factors determining the strength of electrical transmission and review current evidence demonstrating its dynamic properties. Like their chemical counterparts, electrical synapses can also be plastic and modifiable. This article is part of a Special Issue entitled: The Communicating junctions, roles and dysfunctions.


Asunto(s)
Uniones Comunicantes/fisiología , Transmisión Sináptica , Animales , Conexinas/metabolismo , Conexinas/fisiología , Uniones Comunicantes/metabolismo , Uniones Comunicantes/ultraestructura , Humanos , Modelos Biológicos , Neuronas/metabolismo , Neuronas/fisiología , Neuronas/ultraestructura , Neurotransmisores/metabolismo , Neurotransmisores/fisiología , Potenciales Sinápticos
16.
Biochem Soc Trans ; 42(6): 1715-9, 2014 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-25399595

RESUMEN

The present article addresses the possibilities offered by yeasts to study the problem of the evolution of moonlighting proteins. It focuses on data available on hexokinase from Saccharomyces cerevisiae that moonlights in catabolite repression and on galactokinase from Kluyveromyces lactis that moonlights controlling the induction of the GAL genes. Possible experimental approaches to studying the evolution of moonlighting hexose kinases are suggested.


Asunto(s)
Evolución Molecular , Proteínas de Saccharomyces cerevisiae/metabolismo , Saccharomyces cerevisiae/enzimología , Galactoquinasa/genética , Galactoquinasa/metabolismo , Duplicación de Gen , Hexoquinasa/genética , Hexoquinasa/metabolismo , Proteínas de Saccharomyces cerevisiae/genética
17.
Calcif Tissue Int ; 95(1): 83-93, 2014 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-24838599

RESUMEN

Osteopetrosis due to lack of acid secretion by osteoclasts is characterized by abolished bone resorption, increased osteoclast numbers, but normal or even increased bone formation. In contrast, osteoclast-poor osteopetrosis appears to have less osteoblasts and reduced bone formation, indicating that osteoclasts are important for regulating osteoblast activity. To illuminate the role of the osteoclast in controlling bone remodeling, we transplanted irradiated skeletally mature 3-month old wild-type mice with hematopoietic stem cells (HSCs) to generate either an osteoclast-rich or osteoclast-poor adult osteopetrosis model. We used fetal liver HSCs from (1) oc/oc mice, (2) RANK KO mice, and (3) compared these to wt control cells. TRAP5b activity, a marker of osteoclast number and size, was increased in the oc/oc recipients, while a significant reduction was seen in the RANK KO recipients. In contrast, the bone resorption marker CTX-I was similarly decreased in both groups. Both oc/oc and Rank KO recipients developed a mild osteopetrotic phenotype. However, the osteoclast-rich oc/oc recipients showed higher trabecular bone volume (40 %), increased bone strength (66 %), and increased bone formation rate (54 %) in trabecular bone, while RANK KO recipients showed only minor trends compared to control recipients. We here show that maintaining non-resorbing osteoclasts, as opposed to reducing the osteoclasts, leads to increased bone formation, bone volume, and ultimately higher bone strength in vivo, which indicates that osteoclasts are sources of anabolic molecules for the osteoblasts.


Asunto(s)
Resorción Ósea/patología , Osteoclastos/fisiología , Osteogénesis/fisiología , Osteopetrosis/patología , Animales , Fenómenos Biomecánicos , Resorción Ósea/fisiopatología , Modelos Animales de Enfermedad , Femenino , Masculino , Ratones , Ratones Mutantes , Osteoclastos/patología , Osteopetrosis/fisiopatología , Microtomografía por Rayos X
18.
Infect Dis Health ; 29(1): 51-60, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-37993309

RESUMEN

BACKGROUND: Adequate hand hygiene is considered as one of the most effective strategies in healthcare-related infection prevention. The potential negative effect of rings in hand disinfection and thus, in increased nosocomial infections rates is still controversial. Therefore, the present study was designed with the purpose of examining if rings frequently exposed to surgical scrubbing were associated or not with increased bacterial counts. METHODS: 32 volunteers were randomized into 4 groups: A (no rings), B (participants wore a ring), C (no rings and performed surgical scrubbing with chlorhexidine every 48 h) and D (participants wore a ring and performed surgical scrubbing every 48 h). Glove juice samples were obtained at day 0 (T0) and after a 90-min mock-surgery on day 14 (T1). Quantitative (number of UFC/mL) and qualitative data (microorganism type) were collected as study variables. RESULTS: All groups were comparable at T0. All ring carriers obtained negative cultures at T1. Ring presence was not associated with higher bacterial counts; comparisons between A vs B groups and C vs D groups showed no statistically significant differences (p = 0.076 and 1.000). T1 negative cultures were more frequent in participants performing surgical scrubbing every second day (93.8 % vs 75 %), although this difference did not reach statistical significance (p = 0.332). CONCLUSIONS: The presence of single plain ring does not seem to be associated with an increased hand bacterial load. Regular surgical scrubbing with chlorhexidine impregnated sponges reduces bacterial contamination of hands, even in the presence of plain rings.


Asunto(s)
Clorhexidina , Mano , Humanos , Carga Bacteriana , Mano/microbiología , Bacterias , Personal de Salud
19.
J Burn Care Res ; 45(3): 655-659, 2024 05 06.
Artículo en Inglés | MEDLINE | ID: mdl-38520289

RESUMEN

While most friction burns are adequately managed in an outpatient setting, many may require hospital admission, operative excision, and extended care. To this day, there is a wide variance in friction burn management. Our goal is to review the etiology, management, and outcomes of such burns warranting hospitalization. We conducted a retrospective review of all friction burns admitted to a single, American Burn Association-verified burn center from January 1, 2016 to December 31, 2020. A total of 28 (34%) patients required surgery for their friction burns and 15 (18%) ultimately required a split-thickness skin graft. The mean number of operations was 2.4 (95% CI 1.6-3.1). Overall, the operative group was younger (29.9 vs 38.3 years, P = .026), more likely to have a concomitant traumatic brain injury (25% vs 7%, P = .027), and had a longer hospital length of stay (17.5 vs 3.9 days, P < .001). Both groups had a similar overall TBSA (8.5% vs 10.0%, P = .35), but the operative group had a larger surface area comprised of third-degree burns (3.05% vs 0.2%, P < .001). Overall, friction burns resulting in hospital admission are associated with high-energy traumatic mechanisms and concomitant injuries. Patients who need operative intervention for their burns typically require multiple procedures often culminating in a split-thickness skin graft. While non-operative management of friction burns with topical agents has been found to be successful, patients with higher injury severity scores should be monitored very closely as they may require surgical excision.


Asunto(s)
Quemaduras , Fricción , Trasplante de Piel , Humanos , Quemaduras/terapia , Masculino , Estudios Retrospectivos , Adulto , Femenino , Tiempo de Internación/estadística & datos numéricos , Alta del Paciente , Unidades de Quemados , Persona de Mediana Edad , Hospitalización
20.
Cir Cir ; 92(2): 255-263, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38782388

RESUMEN

OBJECTIVE: To assess and compare the functional and quality of life results in patients treated with curative intent for localized prostate cancer during 2015 in our hospital. METHOD: 77 patients treated by radical prostatectomy or external radiotherapy with androgen deprivation were prospective enrolled. Expanded Prostate Cancer Index Composite for Clinical Practice (EPIC-CP) questionnaire at 3-year follow-up and Spanish Questionnaire on Quality of Life in Patients with Prostate Cancer (CAVIPRES-30) at diagnosis and at 3-year follow-up were registered. RESULTS: 68 patients were included, 39 patients treated by radical prostatectomy and 29 received external radiotherapy with androgen deprivation. Among the operated patients, 61.5% were dry and 17.9% use three or more daily pads, compared to 72.4% and 6.8%, respectively, in the radiotherapy group. 48.7% of prostatectomized patients reported very poor or no capacity to have a sufficiently rigid erection, compared to 69% of the radiated group. After surgery, 43.6% considered bad or very bad quality-of-life, compared to 68.9% in the radiotherapy group. In the comparison of the data of the pre- and post-treatment questionnaire can be seen that the patients had a superior perception before the procedure. CONCLUSIONS: Patients treated by surgery have a better perception of quality-of-life compared to those treated by radiotherapy.


OBJETIVO: Determinar y comparar los resultados funcionales y de calidad de vida de pacientes con cáncer de próstata tratados con intención curativa durante el año 2015 en nuestro centro. MÉTODO: Se incluyeron 77 pacientes sometidos a prostatectomía radical (PR) o radioterapia externa con terapia de deprivación androgénica (TDA). Se realizaron el Expanded Prostate Cancer Index Composite for Clinical Practice (EPIC-CP) tras 3 años de seguimiento y el Cuestionario Español de Calidad de Vida en Pacientes con Cáncer de Próstata (CAVIPRES-30) al diagnóstico y a los 3 años. RESULTADOS: Se incluyeron 68 pacientes, 39 con PR y 29 con radioterapia más TDA. De los pacientes intervenidos, el 61.5% están secos y el 17.9% usan tres o más compresas, diarias frente al 72.4% y el 6.8%, respectivamente, en el grupo de radioterapia. El 48.7% de los prostatectomizados refieren erecciones muy malas o ninguna, frente al 69% de los radiados. Tras la cirugía, el 43.6% refieren mala o muy mala calidad de vida, frente al 68.9% de los radiados. En la comparación de los datos del cuestionario pre- y postratamiento, los pacientes tenían una percepción superior antes del procedimiento. CONCLUSIONES: Los pacientes tratados mediante cirugía tienen una mejor percepción de su calidad de vida relacionada con la salud que los radiados.


Asunto(s)
Prostatectomía , Neoplasias de la Próstata , Calidad de Vida , Humanos , Masculino , Prostatectomía/métodos , Neoplasias de la Próstata/radioterapia , Neoplasias de la Próstata/cirugía , Neoplasias de la Próstata/psicología , Anciano , Estudios Prospectivos , Persona de Mediana Edad , Antagonistas de Andrógenos/uso terapéutico , Encuestas y Cuestionarios , Disfunción Eréctil/etiología , Estudios de Seguimiento
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