RESUMO
The Southern Ocean and the Antarctic Circumpolar Current create environmental conditions that serve as an efficient barrier to prevent the colonization of non-native species (NNS) in the marine ecosystems of Antarctica. However, warming of the Southern Ocean and the increasing number of transport opportunities are reducing the physiological and physical barriers, increasing the chances of NNS arriving. The aim of this study was to determine the limits of survival of the juvenile mussels, M. chilensis, under current Antarctic conditions and those projected under climate change. These assessments were used to define the mussels potential for establishment in the Antarctic region. Experimental mussels were exposed to four treatments: -1.5 °C (Antarctic winter), 2 °C (Antarctic summer), 4 °C (Antarctic projected) and 8 °C (control) for 80 days and a combination of physiological and transcriptomics approaches were used to investigate mussel response. The molecular responses of mussels were congruent with the physiological results, revealing tolerance to Antarctic winter temperatures. However, a higher number of regulated differentially expressed gene (DEGs) were reported in mussels exposed to Antarctic winter temperatures (-1.5 °C). This tolerance was associated with the activation of the biological processes associated with apoptosis (up regulated) and both cell division and cilium assembly (down regulated). The reduced feeding rate and the negative scope for growth, for a large part of the exposure period at -1.5 °C, suggests that Antarctic winter temperatures represents an environmental barrier to M. chilensis from the Magellanic region settling in the Antarctic. Although M. chilensis are not robust to current Antarctica thermal conditions, future warming scenarios are likely to weaken these physiological barriers. These results strongly suggest that the West Antarctic Peninsula could become part of Mytilus distributional range, especially with dispersal aided by increasing maritime transport activity across the Southern Ocean.
Assuntos
Mytilus , Água do Mar , Animais , Mytilus/fisiologia , Ecossistema , Temperatura , Regiões Antárticas , Oceanos e MaresAssuntos
Humanos , Feminino , Gravidez , Cesárea , Tomada de Decisões , Autonomia Pessoal , Consentimento Livre e EsclarecidoAssuntos
Humanos , Feminino , Gravidez , Ultrassonografia Pré-Natal/normas , Desenvolvimento Fetal , Padrões de Referência , ChileRESUMO
Increased carbon dioxide in the atmosphere and its absorption across the ocean surface will alter natural variations in pH and temperature levels, occurring in coastal upwelling ecosystems. The scallop Argopecten purpuratus, one of the most economically important species farmed in northern Chile, has been shown to be vulnerable to these environmental drivers. However, the regulatory responses at the gene-level of scallops to these climate stressors remain almost unknown. Consequently, we used an orthogonal experimental design and RNAseq approach to analyze the acute effects of variability in pH and temperature on gene expression in the muscle tissue of A. purpuratus. In respect to control conditions (pH ~ 8.0/ 14 °C), the influence of low pH (~ 7.7) and temperature (14 °C) induced the activation of several genes associated with apoptotic signaling pathways and protein localization to plasma membrane. Elevated temperature (18 °C) and pH (~8.0) conditions increased the expression of transcripts associated with the activation of muscle contraction, regulation, and sarcomere organization effects on muscle tissue. In scallops exposed to low pH and elevated temperature, the genes expressed were differentially associated with the oxidation-reduction process, signal translation, and positive regulation of GTPase activity. These results indicated that the differentially expressed genes under the experimental conditions tested are mainly related to the mitigation of cellular damage and homeostasis control. Our results add knowledge about the function of the adductor muscle in response to stressors in scallops. Furthermore, these results could help in the identification of molecular biomarkers of stress necessary to be integrated into the aquaculture programs for the mitigation of climate change.
Assuntos
Ecossistema , Pectinidae , Animais , Temperatura , Pectinidae/genética , Aquicultura , Perfilação da Expressão Gênica , Concentração de Íons de HidrogênioRESUMO
The polychaete Boccardia wellingtonensis is a poecilogonous species that produces different larval types. Females may lay Type I capsules, in which only planktotrophic larvae are present, or Type III capsules that contain planktotrophic and adelphophagic larvae as well as nurse eggs. While planktotrophic larvae do not feed during encapsulation, adelphophagic larvae develop by feeding on nurse eggs and on other larvae inside the capsules and hatch at the juvenile stage. Previous works have not found differences in the morphology between the two larval types; thus, the factors explaining contrasting feeding abilities in larvae of this species are still unknown. In this paper, we use a transcriptomic approach to study the cellular and genetic mechanisms underlying the different larval trophic modes of B. wellingtonensis. By using approximately 624 million high-quality reads, we assemble the de novo transcriptome with 133,314 contigs, coding 32,390 putative proteins. We identify 5221 genes that are up-regulated in larval stages compared to their expression in adult individuals. The genetic expression profile differed between larval trophic modes, with genes involved in lipid metabolism and chaetogenesis over expressed in planktotrophic larvae. In contrast, up-regulated genes in adelphophagic larvae were associated with DNA replication and mRNA synthesis.
Assuntos
Sequenciamento do Exoma/métodos , Perfilação da Expressão Gênica/métodos , Poliquetos/genética , Proteínas de Protozoários/genética , Animais , Feminino , Regulação da Expressão Gênica no Desenvolvimento , Sequenciamento de Nucleotídeos em Larga Escala , Larva/genética , MasculinoRESUMO
Global biodiversity is both declining and being redistributed in response to multiple drivers characterizing the Anthropocene, including synergies between biological invasions and climate change. The Antarctic marine benthos may constitute the last biogeographic realm where barriers (oceanographic currents, climatic gradients) have not yet been broken. Here we report the successful settlement of a cohort of Mytilus cf. platensis in a shallow subtidal habitat of the South Shetland Islands in 2019, which demonstrates the ability of this species to complete its early life stages in this extreme environment. Genetic analyses and shipping records show that this observation is consistent with the dominant vectors and pathways linking southern Patagonia with the Antarctic Peninsula and demonstrates the potential for impending invasions of Antarctic ecosystems.
Assuntos
Bivalves/classificação , Bivalves/fisiologia , Complexo IV da Cadeia de Transporte de Elétrons/genética , RNA Ribossômico 16S/genética , Animais , Regiões Antárticas , Biodiversidade , Mudança Climática , Espécies Introduzidas , Filogenia , Dinâmica Populacional , Análise de Sequência de DNA/métodos , América do SulRESUMO
Poecilogony is a type of reproduction in which a species produces different types of larvae. Boccardia wellingtonensis, is a poecilogonous polychaete with females producing planktotrophic and adelphophagic larvae, in addition to nurse eggs, in the same capsule that differ in feeding behavior. It is still unclear why planktotrophs do not feed on nurse eggs during the intracapsular development and arrest its growth, while adelphophagic larvae consume nurse eggs and planktotrophic larvae inside the capsule, hatching as advance larvae or as juveniles. Here we characterized the expression of selected miRNAs from these two types of larvae and from adults in order to begin to understand the molecular mechanisms that regulate expression in this type of poecilogony. Results showed that adults and pre-hatching adelphophagic larvae have high levels of expression of miR-125, miR-87a and let-7, while adelphophages at early developmental stage had low levels of expression of miR-87b. Planktotrophic larvae showed low expression level of let-7. This work represents the first step in understanding the role of miRNAs in the development of different larval types in a poecilogonous species. We also propose to B. wellingtonensis as an interesting biological model to study the evolution of larval modes and reproductive strategies of marine invertebrates.
Assuntos
Expressão Gênica , MicroRNAs/genética , Poliquetos/genética , Animais , Comportamento Alimentar , Larva/genética , Larva/crescimento & desenvolvimento , Larva/metabolismo , MicroRNAs/metabolismo , Poliquetos/crescimento & desenvolvimento , Poliquetos/fisiologia , ReproduçãoRESUMO
BACKGROUND: Previous studies that evaluated mortality in elderly subjects who received mechanical ventilation had conflicting results. The aim of this systematic review was to evaluate the effects of age on mortality. METHODS: A number of medical literature databases and the references listed (from 1974 to May 2015) were searched for studies that compared 2 different age groups. The primary outcome was mortality in subjects ages ≥ 65 y. The severity scores, ICU and hospital lengths of stay, and the presence of ventilator-associated pneumonia were secondary outcomes. Finally, mortality in the subjects with ARDS and of cutoff ages 70 and 80 y was assessed by subgroup analysis. Evidence quality was assessed by the GRADE (Grading of Recommendations Assessment, Development, and Evaluation) criteria score. RESULTS: Of the 5,182 articles identified, 21 were included. Subjects ages ≥ 65 y had higher mortalities (odds ratio [OR] 1.80, 95% CI 1.56-2.08; I2 = 71%). APACHE (Acute Physiology and Chronic Health Evaluation) II revealed intergroup differences (mean difference 3.07, 95% CI 2.52-3.61; I2 = 0%), whereas neither the ICU nor hospital length of stay (mean difference 1.27, 95% CI -0.82 to 3.36, I2 = 82%, and mean difference 1.29, 95% CI -0.71 to 3.29, I2 = 0%, respectively) nor the groups in the 2 studies that assessed ventilator-associated pneumonia exhibited any difference. Subgroup analysis revealed a higher mortality in the older subjects, in the subjects with ARDS (OR 1.76, 95% CI 1.30-2.36; I2 = 0%) and in the subjects ages 70 and 80 y (OR 1.78, 95% CI 1.51-2.10, I2 = 71%; and OR 1.96, 95% CI 1.81-2.13, I2 = 0%, respectively). The quality of associated evidence was low or very low. CONCLUSIONS: Although low-quality evidence was available, we conclude that age is associated with a greater mortality in critical subjects who were receiving mechanical ventilation.
Assuntos
Estado Terminal , Idoso , Estado Terminal/mortalidade , Estado Terminal/terapia , Humanos , Mortalidade , Respiração Artificial/métodos , Respiração Artificial/mortalidadeRESUMO
RESUMEN Introducción: El estándar para inducción de madurez pulmonar en fetos con riesgo de nacer prematuramente es la administración de 12 mg de betametasona acetato/fosfato por dos veces espaciada cada 24 horas. El uso establecido en algunos hospitales públicos en Chile es con dos dosis de 12 mg betametasona fosfato aunque no existen estudios publicados sólo con betametasona fosfato sobre la incidencia de Síndrome de Distress Respiratorio (SDR). Objetivo: Evaluar efecto de betametasona en su forma fosfato como tratamiento antenatal para inducción de madurez fetal pulmonar en la incidencia SDR debido a membrana hialina en prematuros menores de 34 semanas de edad gestacional. Comparar el efecto de betametasona fosfato con el efecto publicado de betametasona acetato/fosfato. Material y método: Análisis de incidencia de SDR en prematuros nacidos en Hospital Padre Hurtado entre 24+0 y 34+0 semanas que recibieron betametasona fosfato para madurez pulmonar y aquellos que no la recibieron. Resultados: De 1.265 neonatos estudiados, 722 completaron dos dosis (57,5%); 436 sólo una dosis (34,5%) y 107 (8,5%) no recibieron corticoides antenatales. La incidencia de SDR debido a membrana hialina en el grupo con dos dosis fue 8,7%, una dosis 25,3% y 32,7% en los no tratados (p<0,001). Para SDR severo las incidencias fueron 6,7%, 12,6% y 16,8% respectivamente (p<0,001). Conclusiones: Inducción de madurez fetal pulmonar con betametasona fosfato en dos dosis de 12 mg IM separadas por 24 horas otorga una reducción significativa de incidencia de SDR semejante a la publicada con betametasona acetato/fosfato en iguales dosis.
ABSTRACT The standard for induction of lung maturity in fetuses at risk of being born prematurely is the administration of 12 mg of betamethasone acetate/phosphate two doses separated by 24 hours. The established use in some public hospitals in Chile is with two doses of 12 mg betamethasone phosphate although there are no studies published with betamethasone phosphate alone on the incidence of respiratory distress syndrome (RDS). Objective: To evaluate the effect of betamethasone in its phosphate form as antenatal treatment for the induction of fetal lung maturity in the incidence of RDS due to hyaline membrane in preterm infants less than 34 weeks of gestational age. To compare the effect of betamethasone phosphate with the published effect of betamethasone acetate/phosphate. Material and method: Analysis of the incidence of RDS in preterm infants born at Hospital Padre Hurtado between 24 + 0 and 34 + 0 weeks who received betamethasone phosphate for lung maturity and those who did not receive it. Results: Of 1,265 infants studied, 722 completed two doses (57.5%); 436 only one dose (34.5%) and 107 (8.5%) did not receive antenatal corticosteroids. The incidence of RDS due to hyaline membrane in the group with two doses was 8.7%, one dose 25.3% and 32.7% in the untreated ones (p <0.001). For severe RDS, incidences were 6.7%, 12.6% and 16.8% respectively (p <0.001). Conclusions: Induction of fetal lung maturity with betamethasone phosphate in two doses of 12 mg IM separated by 24 hours gives a significant reduction in the incidence of RDS similar to that published with betamethasone acetate/phosphate in equal doses.
Assuntos
Humanos , Feminino , Gravidez , Recém-Nascido , Síndrome do Desconforto Respiratório do Recém-Nascido/prevenção & controle , Betametasona/análogos & derivados , Nascimento Prematuro , Glucocorticoides/administração & dosagem , Cuidado Pré-Natal/métodos , Síndrome do Desconforto Respiratório do Recém-Nascido/epidemiologia , Betametasona/administração & dosagem , Incidência , Estudos Retrospectivos , Hospitais Públicos , Doença da Membrana Hialina/prevenção & controle , Pulmão/efeitos dos fármacosAssuntos
Anormalidades Craniofaciais/cirurgia , Osteogênese por Distração/métodos , Desenho de Equipamento , Fixadores Externos , Síndrome de Goldenhar/cirurgia , Humanos , Mandíbula/cirurgia , Maxila/cirurgia , Procedimentos Cirúrgicos Ortognáticos/métodos , Osteogênese por Distração/instrumentação , Osteotomia/métodosRESUMO
The aim of this study was to select autochthonous strains of Lactobacillus from stools of healthy infants and adults, human milk, artisanal goat cheese, and fruits and vegetables according to their probiotic properties and safety. From 421 strains of Lactobacillus isolated, 102 (24.2%) were shown to be tolerant to gastric pH and bile salts; they were used to determine their anti-Helicobacter pylori (agar diffusion assay), antioxidant (oxygen radical absorption capacity), and anti-inflammatory (inhibition of interleukin-8 release by tumor necrosis factor-α-stimulated HT-29 cells) activities as well as their ability to adhere to intestinal (Caco-2) and gastric (AGS) epithelial cells. Results obtained were compared with three commercial probiotic Lactobacillus rhamnosus GG, L. plantarum 299v, and L. johnsonii NCC533. The five strains most efficient according to these activities were subsequently identified by sequencing their 16S rRNA gene, their susceptibility to antibiotics was determined, and their safety evaluated in mice. One strain of L. plantarum was discarded due to the higher prevalence of liver bacterial translocation observed in the animals fed this strain. In conclusion, four autochthonous strains of L. rhamnosus were finally selected with probiotic properties and safety allowing their eventual use in human studies. These results contribute to increase the diversity of probiotic strains available for the development of nutraceuticals and functional foods.
Assuntos
Queijo/microbiologia , Fezes/microbiologia , Lactobacillus/isolamento & purificação , Leite Humano/microbiologia , Plantas/microbiologia , Probióticos/isolamento & purificação , Adulto , Animais , Antibacterianos/farmacologia , Antibiose , Aderência Bacteriana , Ácidos e Sais Biliares/farmacologia , Linhagem Celular , Feminino , Cabras , Humanos , Lactente , Lactobacillus/efeitos dos fármacos , Lactobacillus/genética , Lactobacillus/fisiologia , Masculino , Camundongos , Probióticos/classificaçãoRESUMO
INTRODUCTION: Distraction Osteogenesis (DO) became an alternative for the treatment of severe craniofacial skeletal dysplasias. The rigid external distraction device (RED) is successfully used to advance the maxilla and all the maxillary-orbital-frontal complex (monobloc) in children, adolescents and adults. This approach provides predictable and stable results, and it can be applied alone or with craniofacial orthognathic surgical procedures. OBJECTIVE: In the present article, the technical aspects relevant to an adequate application of the RED will be described, including the planning, surgical and orthodontic procedures.
Assuntos
Fenda Labial/complicações , Fissura Palatina/complicações , Fixadores Externos , Maxila/anormalidades , Desenho de Aparelho Ortodôntico/métodos , Procedimentos Cirúrgicos Ortognáticos/métodos , Osteogênese por Distração/instrumentação , Adolescente , Adulto , Criança , Humanos , Maxila/cirurgia , Osteogênese por Distração/métodos , SíndromeRESUMO
INTRODUCTION: Distraction Osteogenesis (DO) became an alternative for the treatment of severe craniofacial skeletal dysplasias. The rigid external distraction device (RED) is successfully used to advance the maxilla and all the maxillary-orbital-frontal complex (monobloc) in children, adolescents and adults. This approach provides predictable and stable results, and it can be applied alone or with craniofacial orthognathic surgical procedures. OBJECTIVE: In the present article, the technical aspects relevant to an adequate application of the RED will be described, including the planning, surgical and orthodontic procedures.
INTRODUÇÃO: a Distração Osteogênica (DO) tornou-se uma alternativa para o tratamento das displasias craniofaciais esqueléticas severas. O aparelho distrator externo rígido (RED) é utilizado com êxito para avançar a maxila e todo o complexo maxilar-orbital-frontal (monobloco) em crianças, adolescentes e adultos. Essa abordagem proporciona resultados previsíveis e estáveis, podendo ser aplicada isoladamente ou junto a procedimentos cirúrgicos ortognáticos craniofaciais. OBJETIVO: no presente artigo, serão descritos os aspectos técnicos pertinentes a uma adequada aplicação do RED, incluindo o planejamento, procedimentos cirúrgicos e ortodônticos.
Assuntos
Adolescente , Adulto , Criança , Humanos , Fenda Labial/complicações , Fissura Palatina/complicações , Fixadores Externos , Maxila/anormalidades , Desenho de Aparelho Ortodôntico/métodos , Procedimentos Cirúrgicos Ortognáticos/métodos , Osteogênese por Distração/instrumentação , Maxila/cirurgia , Osteogênese por Distração/métodos , SíndromeRESUMO
OBJECTIVE: To present technical modifications to the original presurgical nasal remodeling appliance introduced in 1991. The purpose of the modifications is to improve the cleft nasal deformity before unilateral and bilateral cleft lip repair. METHOD: The principle behind this technique, known as dynamic presurgical nasal remodeling (DPNR), is the use of the force generated during suction and swallowing. A conventional intraoral plate is built with a nasal extension added to the labial vestibular flange. The nasal extension was modified and consists of three components. The palatal plate is left loose in the mouth to generate a discontinuous but controlled impact directed to the affected nasal structures during suction and swallowing. The principle aim of the DPNR technique in unilateral cases is to improve the deformation of nasal structures by straightening the columella, elevating the nasal tip, and remodeling the depressed cleft side alar cartilages. In bilateral cases, the aims are to elongate the columella and to obtain nasal tip projection. CONCLUSIONS: The modifications introduced in the appliance enhance the original DPNR technique and are effective in ameliorating the initial cleft nasal deformity. This facilitates primary surgical cleft lip and nose correction and improves surgical outcomes in patients with complete unilateral and bilateral cleft lip and palate.