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1.
Child Care Health Dev ; 50(1): e13199, 2024 01.
Artigo em Inglês | MEDLINE | ID: mdl-37967565

RESUMO

PURPOSE: To develop, implement and assess the results of psychoeducation to improve the QoL of parents with CHD newborns. METHODS: Participants were parents of inpatient newborns with the diagnosis of non-syndromic CHD. We conducted a parallel RCT with an allocation ratio of 1:1 (intervention vs. control), considering the newborns, using mixed methods research. The intervention group received psychoeducation (Parental Psychoeducation in CHD [PPeCHD]) and the usual routines, and the control group received just the regular practices. The allocation concealment was assured. PI was involved in enrolling participants, developing and implementing the intervention, data collection and data analysis. We followed the Consolidated Standards of Reporting Trials (CONSORT) guidelines. RESULTS: Parents of eight newborns were allocated to the intervention group (n = 15 parents) and eight to the control group (n = 13 parents). It was performed as an intention-to-treat (ITT) analysis. In M2 (4 weeks), the intervention group presented better QoL levels in the physical, psychological, and environmental domains of World Health Organization Quality of Life instrument (WHOQOL-Bref). In M3 (16 weeks), scores in physical and psychological domains maintained a statistically significant difference between the groups. CONCLUSIONS: The PPeCHD, the psychoeducational intervention we developed, positively impacted parental QoL. These results support the initial hypothesis. This study is a fundamental milestone in this research field, adding new essential information to the literature.


Assuntos
Cardiopatias Congênitas , Qualidade de Vida , Recém-Nascido , Criança , Humanos , Qualidade de Vida/psicologia , Pais/psicologia , Cardiopatias Congênitas/psicologia
2.
J Pediatr Nurs ; 65: e26-e27, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35042637

RESUMO

The COVID-19 pandemic is a complex and multifaceted event, and it is even argued that it should be seen as a syndemic and not a pandemic . Its impacts will still be felt over the years and, perhaps, are irreparable in some aspects. It is essential to mobilize Governments, civil society and non-governmental organizations to outline measures to combat school dropout and social inclusion.


Assuntos
COVID-19 , Pré-Escolar , Emoções , Humanos , Pandemias
3.
J Pediatr Nurs ; 66: e168-e169, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35459567

RESUMO

As soon as they are taken prisoner, children and adolescents in times of war are inserted into a spiral of cruelty that progresses to rape or other countless forms of physical and psychological torture using sex as a weapon. Were these children and adolescents war sex slaves? Oral sex and other sexual barbarities are part of spaces of abuse and humiliation. The damage to the personality structure of these children and adolescents is severe. The psychological consequences are numerous. Over the years, a vicious circle has been observed around this brutality.


Assuntos
Maus-Tratos Infantis , Estupro , Tortura , Adolescente , Criança , Humanos , Guerra
4.
J Pediatr Nurs ; 65: e9-e10, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-34949518

RESUMO

The HIV epidemic enters its fifth decade amid a global pandemic. The increasing poverty, mental health problems, and abuse are raising the risk of infection for children, adolescents, and women. The inequalities driving the HIV epidemic, which are now exacerbated by COVID-19, demonstrate the social and clinical inequalities of more children infected with HIV and more children losing their fight against AIDS. In this context, current evidence highlights that, alarmingly, two out of five children living with HIV worldwide are unaware of their status, and just over half of children with HIV are receiving antiretroviral treatment. Discrimination and gender inequalities permeate significant situations in HIV services due to COVID-19 in early 2020 and throughout 2021. It was observed in recent studies substantial reductions in births in health facilities, maternal HIV testing, and initiation of antiretroviral treatment for HIV. An AIDS-free generation should be possible, but we are not there yet. HIV remains a burden.


Assuntos
COVID-19 , Infecções por HIV , Adolescente , Criança , Família , Feminino , Infecções por HIV/diagnóstico , Infecções por HIV/tratamento farmacológico , Infecções por HIV/epidemiologia , Humanos , Pandemias , Pobreza
5.
Orbit ; 41(1): 112-117, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32912014

RESUMO

A 59-year-old female patient was diagnosed with Whipple's disease (WD) after several months of constitutional complaints and adenopathies that were initially misinterpreted as sarcoidosis. Initial treatment included doxycycline, hydroxychloroquine and prednisolone, which was suspended due to long-term clinical stability. Four months after prednisolone suspension, the patient presented with right periorbital oedema and erythema. Ophthalmological examination revealed restricted eye movements. A computed tomography (CT) scan demonstrated signs of myositis. The patient was treated with anti-inflammatory and antibiotic drugs, that induced remission of the orbitopathy. During the following two years, she presented three relapses, affecting both the right or the left eyes. The last episode was also associated with systemic corticosteroid tapering. Orbitopathy is a rare form of WD presentation and the diagnosis of this condition may be challenging. As the clinical spectrum may range from an incidentaloma to a severe compressive neuropathy, proper recognition and management of WD orbitopathy is essential.


Assuntos
Oftalmopatia de Graves , Doença de Whipple , Antibacterianos/uso terapêutico , Doxiciclina , Feminino , Oftalmopatia de Graves/tratamento farmacológico , Humanos , Pessoa de Meia-Idade , Tropheryma , Doença de Whipple/diagnóstico , Doença de Whipple/tratamento farmacológico
6.
J Immunol ; 203(7): 1693-1700, 2019 10 01.
Artigo em Inglês | MEDLINE | ID: mdl-31462504

RESUMO

An allergic reaction is rapidly generated when allergens bind and cross-link IgE bound to its receptor FcεRI on effector cells, resulting in cell degranulation and release of proinflammatory mediators. The extent of effector cell activation is linked to allergen affinity, oligomeric state, valency, and spacing of IgE-binding epitopes on the allergen. Whereas most of these observations come from studies using synthetic allergens, in this study we have used Timothy grass pollen allergen Phl p 7 and birch pollen allergen Bet v 4 to study these effects. Despite the high homology of these polcalcin family allergens, Phl p 7 and Bet v 4 display different binding characteristics toward two human patient-derived polcalcin-specific IgE Abs. We have used native polcalcin dimers and engineered multimeric allergens to test the effects of affinity and oligomeric state on IgE binding and effector cell activation. Our results indicate that polcalcin multimers are required to stimulate high levels of effector cell degranulation when using the humanized RBL-SX38 cell model and that multivalency can overcome the need for high-affinity interactions.


Assuntos
Alérgenos/imunologia , Afinidade de Anticorpos , Antígenos de Plantas/imunologia , Proteínas de Ligação ao Cálcio/imunologia , Degranulação Celular , Imunoglobulina E/imunologia , Modelos Imunológicos , Proteínas de Plantas/imunologia , Alérgenos/genética , Antígenos de Plantas/genética , Proteínas de Ligação ao Cálcio/genética , Epitopos/genética , Epitopos/imunologia , Células HEK293 , Humanos , Proteínas de Plantas/genética , Multimerização Proteica/genética , Multimerização Proteica/imunologia
7.
Pharm Dev Technol ; 26(3): 269-277, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33322990

RESUMO

In the current study, we demonstrate a structured approach to downstream process development for spray dried amorphous solid dispersions. Direct compression is generally not suitable due to typically poor flow of spray dried powders in tablets. Roller compaction (RC) is therefore the method of choice to enable spray dried dispersion downstream processing. Here, a structured experimental design of RC process parameters was used. The objective was to identify process conditions that lead to improved powder flow without compromising tablet robustness. Ten blends were compacted using different process parameters, and subsequently compressed into tablets. The impact of process parameters on granules and tablet properties was analyzed. We demonstrate that compaction force, gap and mesh aperture have major impact on RC outcomes. A combination of large gap and low force was identified as optimum combination of RC process parameters leading to powder flow improvement that could guarantee low tablet weight variation and at the same prevented loss of blend compressibility.


Assuntos
Composição de Medicamentos/métodos , Excipientes/química , Secagem por Atomização , Comprimidos/química , Química Farmacêutica/métodos , Tamanho da Partícula , Pós
8.
J Card Surg ; 35(7): 1703-1707, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32403179

RESUMO

BACKGROUND: Vena cava anomalies are rare congenital defects due to incorrect development during fetal life, ranging from minor asymptomatic anatomic variations to complex life-threatening abnormalities. Echocardiography plays a fundamental role in the diagnosis, with advanced imaging techniques allowing detailed anatomic delineation. Invasive cardiology techniques are a promising therapeutic approach, but surgery is probably the best option when diffuse compromise of the systemic veins is present. CASE REPORT: An 8-month-old infant presenting episodes of labial cyanosis and a failure to thrive was diagnosed with severe superior vena cava (SVC) stenosis at the right atrium ostium, with decompression via azygos vein and mild inferior vena cava (IVC) stenosis. The patient was referred for surgery, with IVC enlargement and removal of a fibromuscular tissue band on the anterior aspect of the SVC ostium. At a 6-month follow-up, the patient is asymptomatic, with excellent surgical outcome. To the authors' knowledge, only two cases of congenital SVC stenosis have been previously described.


Assuntos
Procedimentos Cirúrgicos Cardiovasculares/métodos , Cardiopatias Congênitas/cirurgia , Veia Cava Inferior/anormalidades , Veia Cava Inferior/cirurgia , Veia Cava Superior/anormalidades , Veia Cava Superior/cirurgia , Constrição Patológica , Ecocardiografia Transesofagiana/métodos , Feminino , Cardiopatias Congênitas/diagnóstico por imagem , Humanos , Lactente , Resultado do Tratamento , Veia Cava Inferior/diagnóstico por imagem , Veia Cava Inferior/patologia , Veia Cava Superior/diagnóstico por imagem , Veia Cava Superior/patologia
9.
Molecules ; 26(1)2020 Dec 25.
Artigo em Inglês | MEDLINE | ID: mdl-33375633

RESUMO

An evaluation of antioxidant and anticancer activity was screened in Leptocarpha rivularis DC flower extracts using four solvents (n-hexane (Hex), dichloromethane (DCM), ethyl acetate (AcOEt), and ethanol (EtOH)). Extracts were compared for total extract flavonoids and phenol contents, antioxidant activity (2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH), ferric reducing antioxidant potential (FRAP), total reactive antioxidant properties (TRAP) and oxygen radical absorbance capacity (ORAC)) across a determined value of reduced/oxidized glutathione (GSH/GSSG), and cell viability (the sulforhodamine B (SRB) assay). The most active extracts were analyzed by chromatographic analysis (GC/MS) and tested for apoptotic pathways. Extracts from Hex, DCM and AcOEt reduced cell viability, caused changes in cell morphology, affected mitochondrial membrane permeability, and induced caspase activation in tumor cell lines HT-29, PC-3, and MCF-7. These effects were generally less pronounced in the HEK-293 cell line (nontumor cells), indicating clear selectivity towards tumor cell lines. We attribute likely extract activity to the presence of sesquiterpene lactones, in combination with other components like steroids and flavonoids.


Assuntos
Antineoplásicos Fitogênicos/química , Asteraceae/química , Neoplasias/tratamento farmacológico , Extratos Vegetais/química , Antineoplásicos Fitogênicos/farmacologia , Antioxidantes/química , Antioxidantes/farmacologia , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Flavonoides/química , Flores/química , Células HEK293 , Humanos , Fenóis/química , Fenóis/farmacologia , Extratos Vegetais/farmacologia
10.
Neuroophthalmology ; 44(6): 355-360, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33408428

RESUMO

Susac's syndrome is a rare immune-mediated endotheliopathy that mainly affects young women. It is characterised by the presence of encephalopathy, retinal vaso-occlusive disease and hearing loss. Diagnosis is based on the clinical presentation, brain magnetic resonance imaging, retinal fluorescein angiography, and audiometry. Treatment consists of immunosuppressive therapy. This review focuses on recent developments in the diagnosis and management of the condition.

11.
Neurol Psychiatry Brain Res ; 37: 27-32, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32834527

RESUMO

OBJECTIVE: To describe the main neurological manifestations related to coronavirus infection in humans. METHODOLOGY: A systematic review was conducted regarding clinical studies on cases that had neurological manifestations associated with COVID-19 and other coronaviruses. The search was carried out in the electronic databases PubMed, Scopus, Embase, and LILACS with the following keywords: "coronavirus" or "Sars-CoV-2" or "COVID-19" and "neurologic manifestations" or "neurological symptoms" or "meningitis" or "encephalitis" or "encephalopathy," following the Systematic Reviews and Meta-Analyses (PRISMA) guidelines. RESULTS: Seven studies were included. Neurological alterations after CoV infection may vary from 17.3% to 36.4% and, in the pediatric age range, encephalitis may be as frequent as respiratory disorders, affecting 11 % and 12 % of patients, respectively. The Investigation included 409 patients diagnosed with CoV infection who presented neurological symptoms, with median age range varying from 3 to 62 years. The main neurological alterations were headache (69; 16.8 %), dizziness (57, 13.9 %), altered consciousness (46; 11.2 %), vomiting (26; 6.3 %), epileptic crises (7; 1.7 %), neuralgia (5; 1.2 %), and ataxia (3; 0.7 %). The main presumed diagnoses were acute viral meningitis/encephalitis in 25 (6.1 %) patients, hypoxic encephalopathy in 23 (5.6 %) patients, acute cerebrovascular disease in 6 (1.4 %) patients, 1 (0.2 %) patient with possible acute disseminated encephalomyelitis, 1 (0.2 %) patient with acute necrotizing hemorrhagic encephalopathy, and 2 (1.4 %) patients with CoV related to Guillain-Barré syndrome. CONCLUSION: Coronaviruses have important neurotropic potential and they cause neurological alterations that range from mild to severe. The main neurological manifestations found were headache, dizziness and altered consciousness.

12.
Neuroophthalmology ; 43(1): 43-48, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30723524

RESUMO

Hypotension is the most frequent complication of haemodialysis. We report a case of acute visual impairment after one session of haemodialysis in a context of an acute optic neuropathy. The immunological and serological studies were negative. The records of hypotension greater than usual after the dialysis session that coincided with the visual complaints strongly suggest the dialysis-induced hypotension is the underlying mechanism of this non-arteritic anterior ischemic optic neuropathy.

13.
J Anat ; 227(4): 440-59, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-26218827

RESUMO

The medial nucleus of the amygdala (Me) is a component of the neural circuit for the interpretation of multimodal sensory stimuli and the elaboration of emotions and social behaviors in primates. We studied the presence, distribution, diverse shape, and connectivity of dendritic spines in the human Me of adult postmortem men. Data were obtained from the five types of multipolar neurons found in the Me using an adapted Golgi method and light microscopy, the carbocyanine DiI fluorescent dye and confocal microscopy, and transmission electron microscopy. Three-dimensional reconstruction of spines showed a continuum of shapes and sizes, with the spines either lying isolated or forming clusters. These dendritic spines were classified as stubby/wide, thin, mushroom-like, ramified or with an atypical morphology including intermediate shapes, double spines, and thorny excrescences. Pleomorphic spines were found from proximal to distal dendritic branches suggesting potential differences for synaptic processing, strength, and plasticity in the Me neurons. Furthermore, the human Me has large and thin spines with a gemmule appearance, spinules, and filopodium. The ultrastructural data showed dendritic spines forming monosynaptic or multisynaptic contacts at the spine head and neck, and with asymmetric or symmetric characteristics. Additional findings included en passant, reciprocal, and serial synapses in the Me. Complex long-necked thin spines were observed in this subcortical area. These new data reveal the diversity of the dendritic spines in the human Me likely involved with the integration and processing of local synaptic inputs and with functional implications in physiological and various neuropathological conditions.


Assuntos
Tonsila do Cerebelo/anatomia & histologia , Dendritos/ultraestrutura , Espinhas Dendríticas/ultraestrutura , Idoso , Axônios/ultraestrutura , Cadáver , Humanos , Masculino , Microscopia Confocal , Microscopia Eletrônica de Transmissão , Pessoa de Meia-Idade
14.
Ultrastruct Pathol ; 39(6): 378-84, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-26548434

RESUMO

Lipofuscin granules (LGs), the "age pigments", are autofluorescent cell products from lysosomes that diverge in number and size among brain regions. Human temporal cortex from 20- to 55-year-old epileptic subjects were studied with the fat soluble dye Sudan Black, under confocal and electron microscopy. Ultrastructural analysis showed that with age LGs increase in area, but not in number. Proportionally to the LGs area, the electron lucid portion increases and the electron dense reduces over time. The robust increase in lipid components is possibly due to modifications in the neuronal metabolism with age in physiological and pathological conditions.


Assuntos
Envelhecimento/patologia , Grânulos Citoplasmáticos/ultraestrutura , Lipofuscina/análise , Neurônios/ultraestrutura , Adulto , Epilepsia do Lobo Temporal/patologia , Feminino , Humanos , Masculino , Microscopia Confocal , Microscopia Eletrônica de Transmissão , Pessoa de Meia-Idade , Neocórtex/ultraestrutura , Lobo Temporal/ultraestrutura , Adulto Jovem
15.
Rev Port Cardiol ; 32(3): 257-9, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23465387

RESUMO

Congenital coronary fistulas are rare conditions, frequently diagnosed as an incidental finding when a patient is referred for cardiac surgery for another reason. Treatment can be conservative, surgical or more recently through transcatheter closure, depending on local experience and the morphology of the fistula. The authors present the case of a pediatric patient with a large coronary artery fistula from the aorta to the right atrium. Transcatheter closure with a 16 mm Amplatzer(®) vascular plug II and a 6 mm Amplatzer(®) duct occluder was performed, with complete occlusion.


Assuntos
Doença da Artéria Coronariana/cirurgia , Átrios do Coração , Cardiopatias/cirurgia , Dispositivo para Oclusão Septal , Fístula Vascular/cirurgia , Criança , Doença da Artéria Coronariana/complicações , Feminino , Cardiopatias/complicações , Humanos , Fístula Vascular/complicações
16.
Rev Cient Odontol (Lima) ; 11(2): e159, 2023.
Artigo em Espanhol | MEDLINE | ID: mdl-38288449

RESUMO

The odontogenic keratocystic tumor (OKT) or also currently known as odontogenic keratocyst (OK) is a benign pathology derived from the remains of the dental lamina characteristic for possessing variable amounts of desquamated keratin. It usually rises as solitary or with the presence of satellite cysts, the appearance of these satellite cysts is frequently related to the possible recurrence of OK, according to the literature, this recurrence can vary between 0 - 50%. As for the treatment stage of (OKT), it can be mentioned that at present there is a well-defined histological and clinical criterion, which facilitates its recognition and therefore its treatment. According to the literature, there are several treatment procedures that can be classified into non-conservative or radical treatments and conservative treatments accompanied by adjuvant methods. Within the non-conservative or radical treatments, we find en bloc resection, which is the most aggressive way to treat a keratocyst; however, it is the most effective way to avoid recurrence. Within the conservative treatments, marsupialization, decompression, and enucleation with or without adjuvant therapy are described. It is paramount to know how to recognize the different types of treatment for (OKT) since this will be conditioned by multiple factors, such as the location of nearby bone structures and the size of the lesion considering the possible involvement of dental structures. The objective is to seek the lowest-risk treatment possible, which avoids recurrence and finally puts an end to this pathology.

17.
ERJ Open Res ; 9(1)2023 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-36628269

RESUMO

Coronavirus disease 2019 (COVID-19) has led to an increasing number of patients in intensive care units (ICUs). The size of this post-ICU cohort will be unprecedented, with many patients vulnerable to post-intensive care syndrome. We analysed the respiratory and functional effects of a multidisciplinary rehabilitation programme on functional performance, in patients hospitalised in the ICU due to COVID-19. We conducted a randomised controlled clinical trial. 96 patients who fulfilled the eligibility criteria were randomised into control or intervention group. The control group received standard of care in the ICU, and the intervention group received a functional and respiratory rehabilitation protocol that included medical, nursing, physiotherapy and occupational therapy interventions. At discharge, the intervention group showed significantly better muscular strength and respiratory capacity, and significantly fewer days of hospitalisation (12.90±5.8 versus 15.60±6.7 days, p=0.037). At the 4- and 12-week follow-up, we applied our main outcome measure, the 6-min walk test (6MWT). The intervention group had significantly better results than the control group on the 6MWT at the 4-week follow-up (604±67 versus 571±57 m, p=0.018) and at the 12-week follow-up (639±53 versus 611±67 m, p=0.025). These results support the role of a multidisciplinary rehabilitation programme in COVID-19 patients hospitalised in the ICU and adds evidence that the implementation of rehabilitation programmes in ICUs could result in beneficial outcomes for critically ill patients.

18.
NeuroRehabilitation ; 52(3): 507-514, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-36806519

RESUMO

BACKGROUND: Dysphagia is a common manifestation after stroke and seems to play a major role in clinical and functional outcomes. OBJECTIVES: To identify clinical predictors of higher degrees of dysphagia, as well as assess its burden in our hospital, in order to understand how to improve the approach to this symptom. METHODS: We included 311 patients admitted in an acute stroke unit in a year-long period. The relationship of dysphagia with different outcomes, both in acute phase and within the first year after stroke, were investigated. RESULTS: Using the Pearson Correlation Coefficient, NIHSS score at admission was positively correlated with the degree of dysphagia (r = 0,783; p < 0,001) and total anterior circulation infarcts and age (> 70 years) were also associated with higher risk of dysphagia (p < 0.001). During hospitalization both respiratory infections and mortality occurred at significantly higher rates for dysphagic patients (p < 0.001) and we observed an increasing trend towards a higher mortality rate, the higher the degree of dysphagia. These patients stayed longer in the stroke unit, with less chance to be discharged home and more frequently transferred to inpatient rehabilitation care. One year after admission, dysphagic patients were more frequently readmitted due to pneumonia and we observed a higher mortality rate compared to patients without dysphagia (p < 0.001). CONCLUSION: The presence of the above-mentioned dysphagia predictive factors should alert us to the need for an early approach, starting in the stroke unit, but also after discharge, taking into account its impact on clinical outcomes, mortality and healthcare costs.


Assuntos
Transtornos de Deglutição , Pneumonia Aspirativa , Reabilitação do Acidente Vascular Cerebral , Acidente Vascular Cerebral , Humanos , Idoso , Transtornos de Deglutição/etiologia , Transtornos de Deglutição/diagnóstico , Acidente Vascular Cerebral/diagnóstico , Alta do Paciente , Avaliação da Deficiência
19.
Plants (Basel) ; 12(10)2023 May 18.
Artigo em Inglês | MEDLINE | ID: mdl-37653935

RESUMO

Irrigated agriculture is responsible for a third of global agricultural production, but the overuse of water resources and intensification of farming practices threaten its sustainability. The use of saline water in irrigation has become an alternative in areas subjected to frequent drought, but this practice affects plant growth due to osmotic impact and excess of ions. Plant-growth-promoting rhizobacteria (PGPR) can mitigate the negative impacts of salinity and other abiotic factors on crop yields. Actinobacteria from the hyper-arid Atacama Desert could increase the plant tolerance to salinity, allowing their use as biofertilizers for lettuce crops using waters with high salt contents. In this work, rhizosphere samples of halophytic Metharme lanata were obtained from Atacama Desert, and actinobacteria were isolated and identified by 16S gene sequencing. The PGPR activities of phosphate solubilization, nitrogen fixation, and the production of siderophore and auxin were assessed at increasing concentrations of NaCl, as well as the enhancement of salt tolerance in lettuce plants irrigated with 100 mM of NaCl. Photosynthesis activity and chlorophyll content, proline content, lipid peroxidation, cation and P concentration, and the identification and quantification of phenolic compounds were assessed. The strains S. niveoruber ATMLC132021 and S. lienomycini ATMLC122021 were positive for nitrogen fixation and P solubilization activities and produced auxin up to 200 mM NaCl. In lettuce plants, both strains were able to improve salt stress tolerance by increasing proline contents, carotenoids, chlorophyll, water use efficiency (WUE), stomatal conductance (gs), and net photosynthesis (A), concomitantly with the overproduction of the phenolic compound dicaffeoylquinic acid. All these traits were positively correlated with the biomass production under saltwater irrigation, suggesting its possible use as bioinoculants for the agriculture in areas where the water resources are scarce and usually with high salt concentrations.

20.
bioRxiv ; 2023 Sep 29.
Artigo em Inglês | MEDLINE | ID: mdl-37808871

RESUMO

Expansion of a hexanucleotide repeat in a noncoding region of the C9ORF72 gene is responsible for a significant fraction of Amyotrophic Lateral Sclerosis (ALS) and Frontotemporal Dementia (FTD) cases, but identifying specific toxic gene products and mechanisms has been difficult. Pathogenesis was proposed to involve the production of toxic RNA species and/or accumulation of toxic dipeptide repeats (DPRs), but distinguishing between these mechanisms has been challenging. In this study, we first use complementary model systems for analyzing pathogenesis in adult-onset neurodegenerative diseases to characterize the pathogenicity of DPRs produced by Repeat Associated Non-ATG (RAN) translation of C9ORF72 in specific cellular compartments: isolated axoplasm and giant synapse from the squid. Results showed selective axonal and presynaptic toxicity of GP-DPRs, independent of associated RNA. These effects involved downstream ASK1 signaling pathways that affect fast axonal transport and synaptic function, a pathogenic mechanism shared with other mutant proteins associated with familial ALS, like SOD1 and FUS. These pathways are sufficient to produce the "dying-back" axonopathy seen in ALS. However, other mutant genes (e.g., SOD1) that activate this mechanism rarely produce FTD. When parallel studies in primary motor neurons from rats were conducted, an additional pathogenic mechanism was revealed. The GR- and PR-DPRs, which had no effect on axonal transport or synaptic transmission, were found to disrupt the nuclei of transfected neurons, leading to "dying-forward" neuropathy. All C9-DRP-mediated toxic effects observed here are independent of whether the corresponding mRNAs contained hexanucleotide repeats or alternative codons. These studies establish the divergent toxicity of C9-DPRs that cause neurodegeneration in ALS and FTD, suggesting that these two independent pathogenic mechanisms may contribute to disease heterogeneity and/or synergize on disease progression in C9ORF72 patients with both ALS and FTD symptoms.

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