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1.
Artigo em Inglês | MEDLINE | ID: mdl-38569484

RESUMO

A significant modification in photoinduced energy transfer in cancer cells is reported by the assistance of a dynamic modulation of the beam size of laser irradiation. Human lung epithelial cancer cells in monolayer form were studied. In contrast to the quantum and thermal ablation effect promoted by a standard focused Gaussian beam, a spatially modulated beam can caused around 15% of decrease in the ablation threshold and formation of a ring-shaped distribution of the photothermal transfer effect. Optical irradiation was conducted in A549 cells by a 532 nm single-beam emerging from a Nd:YVO4 system. Ablation effects derived from spatially modulated convergent waves were controlled by an electrically focus-tunable lens. The proposed chaotic behavior of the spatial modulation followed an Arneodo chaotic oscillator. Fractional dynamic thermal transport was analyzed in order to describe photoenergy in propagation through the samples. Immediate applications of chaos theory for developing phototechnology devices driving biological functions or phototherapy treatments can be considered.

2.
Viruses ; 16(3)2024 Mar 09.
Artigo em Inglês | MEDLINE | ID: mdl-38543785

RESUMO

HIV-1 encodes four accesory proteins in addition to its structural and regulatory genes. Uniquely amongst them, Vpr is abundantly present within virions, meaning it is poised to exert various biological effects on the host cell upon delivery. In this way, Vpr contributes towards the establishment of a successful infection, as evidenced by the extent to which HIV-1 depends on this factor to achieve full pathogenicity in vivo. Although HIV infects various cell types in the host organism, CD4+ T cells are preferentially targeted since they are highly permissive towards productive infection, concomitantly bringing about the hallmark immune dysfunction that accompanies HIV-1 spread. The last several decades have seen unprecedented progress in unraveling the activities Vpr possesses in the host cell at the molecular scale, increasingly underscoring the importance of this viral component. Nevertheless, it remains controversial whether some of these advances bear in vivo relevance, since commonly employed cellular models significantly differ from primary T lymphocytes. One prominent example is the "established" ability of Vpr to induce G2 cell cycle arrest, with enigmatic physiological relevance in infected primary T lymphocytes. The objective of this review is to present these discoveries in their biological context to illustrate the mechanisms whereby Vpr supports HIV-1 infection in CD4+ T cells, whilst identifying findings that require validation in physiologically relevant models.


Assuntos
Infecções por HIV , Soropositividade para HIV , HIV-1 , Humanos , Linfócitos T/metabolismo , Produtos do Gene vpr do Vírus da Imunodeficiência Humana/genética , Produtos do Gene vpr do Vírus da Imunodeficiência Humana/metabolismo , HIV-1/genética , Infecções por HIV/metabolismo , Linfócitos T CD4-Positivos/metabolismo
3.
J Mass Spectrom Adv Clin Lab ; 32: 50-59, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38511102

RESUMO

Introduction: Screening for chronic kidney disease relies on accurate and precise creatinine measurements. Traditionally, creatinine is measured in serum or plasma using high-throughput chemistry analyzers. However, dried blood spots (DBS) can also be utilized to improve testing access. Methods: Samples were obtained from a 6 mm DBS punch, which was reconstituted in water before undergoing an acetonitrile crash. The resulting supernatant was diluted using an 80:20 acetonitrile: water before injection. Creatinine was identified using an isocratic gradient, and detected using an API 4000 triple quadrupole mass analyzer. Quantification relied on matrix-matched calibrators, with values harmonized to the Roche Cobas enzymatic assay. Validation studies assessing method performance included precision, linearity, accuracy, method comparison, stability, interference, and matrix effects. Results: The LC-MSMS assay was linear from 0.3 to 20 mg/dL (y = 1.02x-0.11; R2 = 0.996). Precision ranged from 5.2 to 8.1 % using matrix-matched controls (n = 4) that spanned the analytical measurement range. LC-MSMS results corresponded to the enzymatic assay (Roche) with a fitted line equation of y = 0.956x-0.07 (R2 = 0.995; n = 173). The Siemens and Roche enzymatic assays demonstrated higher accuracy in correlating to the DBS creatinine concentration (n = 40 paired venous/DBS collections) compared to the Beckman Jaffe assay (-2.5 % and -0.8 % versus -6.3 % and -4.1 %, respectively) or the iSTAT (-28.4 % and -27.1 %, respectively). Accuracy was unaffected by hematocrit, blood spot volume, excess IgG or IgA, or hypertriglyceridemia. No matrix effects were observed, and both extraction and processing efficiency were robust.Ambient stability extended to at least 10 days, and exposure to extreme temperature did not affect the creatinine results. Conclusion: We successfully developed an accurate and precise LC-MSMS method for quantifying creatinine in DBS.

4.
Eye Contact Lens ; 50(4): 177-182, 2024 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-38305377

RESUMO

PURPOSE: To evaluate a new in vitro technique for measuring soft contact lens wettability using a nonmodified commercial videokeratoscope, the Medmont E300. To this end, the capability of different artificial tears containing hyaluronic acid (HA) to improve soft contact lens wettability in vitro was investigated. METHODS: An experimental in vitro study was conducted to assess the wetting properties of three artificial tears containing different concentrations of HA (0.1%, 0.2%, and 0.3%) on soft contact lenses. A saline solution was used as the control. For each solution, 15 hydrogel (Ocufilcon D) contact lenses and 15 silicone-hydrogel (Somofilcon A) contact lenses were evaluated. The in vitro wettability of the lenses was measured using the Medmont E300 with a self-developed technique, which involved measuring the tear film surface quality (TFSQ) mean, TFSQ area, TFSQ central, and TFSQ inferior. RESULTS: Compared with the saline solution, all the concentration of HA (0.1%, 0.2%, and 0.3%) improved the in vitro wettability of both soft contact lenses by decreasing their TFSQ mean and TFSQ area ( P <0.05). Regression models revealed an exponential relationship between contact lens wettability and the concentration of HA for both soft contact lenses ( R >0.5, P <0.05). Furthermore, the hydrogel contact lens presented a wetter surface than the silicone-hydrogel contact lens ( P <0.05). CONCLUSIONS: The measurement of in vitro wettability of soft contact lenses with a nonmodified Medmont E300 seems to be a useful technique to evaluate the wetting properties of contact lens products.


Assuntos
Lentes de Contato Hidrofílicas , Lubrificantes Oftálmicos , Humanos , Molhabilidade , Solução Salina , Hidrogéis , Silicones
5.
Biosensors (Basel) ; 14(2)2024 Feb 18.
Artigo em Inglês | MEDLINE | ID: mdl-38392027

RESUMO

Nanostructures have played a key role in the development of different techniques to attack severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Some applications include masks, vaccines, and biosensors. The latter are of great interest for detecting diseases since some of their features allowed us to find specific markers in secretion samples such as saliva, blood, and even tears. Herein, we highlight how hierarchical nanoparticles integrated into two or more low-dimensional materials present outstanding advantages that are attractive for photonic biosensing using their nanoscale functions. The potential of nanohybrids with their superlative mechanical characteristics together with their optical and optoelectronic properties is discussed. The progress in the scientific research focused on using nanoparticles for biosensing a variety of viruses has become a medical milestone in recent years, and has laid the groundwork for future disease treatments. This perspective analyzes the crucial information about the use of hierarchical nanostructures in biosensing for the prevention, treatment, and mitigation of SARS-CoV-2 effects.


Assuntos
Técnicas Biossensoriais , COVID-19 , Nanoestruturas , Vírus , Humanos , SARS-CoV-2 , COVID-19/diagnóstico , Pandemias/prevenção & controle , Nanoestruturas/química , Técnicas Biossensoriais/métodos
6.
Case Rep Oncol Med ; 2024: 5093727, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38264474

RESUMO

Peritoneal cancer is the invasion by malignant cells of serous membrane that lines the abdominal cavity, the viscera, and the coelom of the amniotes. Histologically, it is indistinguishable from ovarian counterpart, although in the former, it commonly involves the ovary only superficially, or it may totally lack an ovarian component, but with extensive involvement of the peritoneum, calcified perihepatic peritoneal nodules, or involvement of the omentum, in most cases. The current study describes the case of a 54-year-old female patient referring a history of colitis and dairy intolerance. A transvaginal ultrasound and a computed tomography (CT) scan revealed a tumor measuring 70 × 61 × 63 mm. CA-125 serum levels were 880 U/ml. Laparotomy surgery was indicated, and tumor was found at the level of the rectovaginal septum without evidence of metastasis. Tumor dissection and protective colostomy with loop sigmoid colon were performed. A pathological study gave a diagnosis of a high-grade peritoneal serous carcinoma with a micropapillary pattern. The present study describes the case of papillary serous peritoneal cancer presented as a single tumor mass without extensive involvement of the peritoneum. Additionally, the need for routine tests for its diagnosis and documenting hormonal alterations as the cause of its origin are suggested.

7.
Radiographics ; 44(2): e230081, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38271255

RESUMO

Patients presenting with visual disturbances often require a neuroimaging approach. The spectrum of visual disturbances includes three main categories: vision impairment, ocular motility dysfunction, and abnormal pupillary response. Decreased vision is usually due to an eye abnormality. However, it can also be related to other disorders affecting the visual pathway, from the retina to the occipital lobe. Ocular motility dysfunction may follow disorders of the cranial nerves responsible for eye movements (ie, oculomotor, trochlear, and abducens nerves); may be due to any abnormality that directly affects the extraocular muscles, such as tumor or inflammation; or may result from any orbital disease that can alter the anatomy or function of these muscles, leading to diplopia and strabismus. Given that pupillary response depends on the normal function of the sympathetic and parasympathetic pathways, an abnormality affecting these neuronal systems manifests, respectively, as pupillary miosis or mydriasis, with other related symptoms. In some cases, neuroimaging studies must complement the clinical ophthalmologic examination to better assess the anatomic and pathologic conditions that could explain the symptoms. US has a major role in the assessment of diseases of the eye and anterior orbit. CT is usually the first-line imaging modality because of its attainability, especially in trauma settings. MRI offers further information for inflammatory and tumoral cases. ©RSNA, 2024 Test Your Knowledge questions for this article are available in the supplemental material.


Assuntos
Músculos Oculomotores , Transtornos da Visão , Humanos , Transtornos da Visão/diagnóstico por imagem , Músculos Oculomotores/inervação , Músculos Oculomotores/patologia , Órbita , Imageamento por Ressonância Magnética
9.
Environ Monit Assess ; 196(2): 203, 2024 Jan 26.
Artigo em Inglês | MEDLINE | ID: mdl-38277071

RESUMO

The alarming increase in extreme weather events, such as severe storms with torrential rain and strong winds, is a direct result of climate change. These events have led to discernible shifts in forest structure and the carbon cycle, primarily driven by a surge in tree mortality. However, the impacts caused by these severe storms on the production and carbon increment from coarse woody debris (CWD) are still poorly understood, especially in the Brazilian Atlantic Forest. Thus, the goal proposed by the study was to quantify the CWD volume, necromass, and carbon stock before and after the occurrence of a severe storm and to determine the importance of spatial, structural, and qualitative variables of trees in the CWD carbon increment. The increase in carbon by the storm was 2.01 MgC ha-1, with a higher concentration in the CWD less decomposed and smaller diameter class. The forest fragment plots showed distinct increments (0.05-0.35 MgC), being influenced by spatial (elevation, declivity, and slope angle) structural (basal area) and qualitative factors (trunk quality and tree health), intrinsic to the forest. Thus, it is concluded that severe storms cause a large increase in carbon in CWD, making it essential to understand the susceptibility of forests to the action of intense rains and strong winds to model and monitor the future impacts of these extreme weather events on Atlantic Forest and other tropical forests in the world.


Assuntos
Carbono , Monitoramento Ambiental , Brasil , Florestas , Madeira , Árvores , Clima Tropical , Biomassa
10.
JAMA Netw Open ; 7(1): e2352648, 2024 Jan 02.
Artigo em Inglês | MEDLINE | ID: mdl-38270953

RESUMO

Importance: Adoption of primary care interventions to reduce childhood obesity is limited. Progress in reducing obesity prevalence and eliminating disparities can be achieved by implementing effective childhood obesity management interventions in primary care settings. Objective: To examine the extent to which implementation strategies supported the uptake of research evidence and implementation of the Connect for Health pediatric weight management program. Design, Setting, and Participants: This quality improvement study took place at 3 geographically and demographically diverse health care organizations with substantially high numbers of children living in low-income communities in Denver, Colorado; Boston, Massachusetts; and Greenville, South Carolina, from November 2019 to April 2022. Participants included pediatric primary care clinicians and staff and families with children aged 2 to 12 years with a body mass index (BMI) in the 85th percentile or higher. Exposures: Pediatric weight management program with clinician-facing tools (ie, clinical decision support tools) and family-facing tools (ie, educational handouts, text messaging program, community resource guide) along with implementation strategies (ie, training and feedback, technical assistance, virtual learning community, aligning with hospital performance metrics) to support the uptake. Main Outcomes and Measures: Primary outcomes were constructs from the Reach, Effectiveness, Adoption, Implementation, Maintenance (RE-AIM) Framework examined through parent, clinician, and leadership surveys and electronic health record data to understand the number of children screened and identified, use of the clinical decision support tools, program acceptability, fidelity to the intervention and implementation strategies, and program sustainability. Results: The program screened and identified 18 333 children across 3 organizations (Denver Health, 8480 children [46.3%]; mean [SD] age, 7.97 [3.31] years; 3863 [45.5%] female; Massachusetts General Hospital (MGH), 6190 children [33.8%]; mean [SD] age, 7.49 [3.19] years; 2920 [47.2%] female; Prisma Health, 3663 children [20.0%]; mean [SD] age, 7.33 [3.15] years; 1692 [46.2%] female) as having an elevated BMI. The actionable flagging system was used for 8718 children (48%). The reach was equitable, with 7843 children (92.4%) from Denver Health, 4071 children (65.8%) from MGH, and 1720 children (47%) from Prisma Health being from racially and ethnically minoritized groups. The sites had high fidelity to the program and 6 implementation strategies, with 4 strategies (67%) used consistently at Denver Health, 6 (100%) at MGH, and 5 (83%) at Prisma Health. A high program acceptability was found across the 3 health care organizations; for example, the mean (SD) Acceptability of Intervention Measure score was 3.72 (0.84) at Denver Health, 3.82 (0.86) at MGH, and 4.28 (0.68) at Prisma Health. The implementation strategies were associated with 7091 (39%) uses of the clinical decision support tool. The mean (SD) program sustainability scores were 4.46 (1.61) at Denver Health, 5.63 (1.28) at MGH, and 5.54 (0.92) at Prisma Health. Conclusions and Relevance: These findings suggest that by understanding what strategies enable the adoption of scalable and implementation-ready programs by other health care organizations, it is feasible to improve the screening, identification, and management of children with overweight or obesity and mitigate existing disparities.


Assuntos
Obesidade Pediátrica , Programas de Redução de Peso , Humanos , Criança , Feminino , Masculino , Obesidade Pediátrica/prevenção & controle , Benchmarking , Índice de Massa Corporal , Hospitais Gerais
11.
Leuk Res Rep ; 21: 100405, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38179336

RESUMO

Background: Acute lymphoblastic leukemia represents 20% of acute leukemias in adults. Currently, there is limited data in Chile regarding the clinical, cytogenetic, and prognostic characteristics of this condition. Methods: This is a retrospective, observational, and descriptive study of 67 patients treated for acute lymphoblastic leukemia at the Arturo Lopez Perez Foundation between 2018 and 2021. The main objective is to evaluate epidemiological and clinical characteristics, as well as identifying factors associated with improved overall survival and/or progression-free survival. Results: 88% of the cases were B-lineage, mainly the common B phenotype. Cytogenetic analysis was performed in less than 50% of the patients, with lower yield than expected according to the literature. Molecular testing was performed in 86.5% of the patients, with the most frequent alteration being BCR-ABL. No study was performed to search for Ph-like abnormalities. The rate of complete response after induction was 83.3%, the majority of patients having negative minimal residual disease. Only 12% of the patients received consolidation with allogenic bone marrow transplant. At 2 years, the overall survival was 69% and the progression-free survival was 59%. Conclusion: The results in terms of overall survival and progression-free survival are similar to those reported in the literature. Important diagnostic gaps prevent adequate prognostic characterization. Allogeneic consolidation transplantation was performed in a lower percentage than expected, highlighting the national deficit in access to this treatment.

12.
J Dent ; 140: 104794, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-38035453

RESUMO

OBJECTIVES: To evaluate if tooth color alteration of activated charcoal-based dentifrices may be attributed to the dye adsorption potential of charcoal (chemical action - C - slurry only) or to the association of dye adsorption with abrasion (chemo-mechanical action - CM- slurry/toothbrushing). Potential adverse effects in surface roughness, gloss, and wear were also assessed. METHODS: Bovine enamel/dentin specimens were randomly allocated into the groups according to treatments and test model (n = 15): deionized water (negative control- NC); Colgate Maximum Anticaries Protection (conventional toothpaste- positive control- PC); Colgate Luminous White Activated Charcoal (LW); Oral-B 3D White Therapy Charcoal (WT); Curaprox Black is White (BW); Dermavita Whitemax (Activated charcoal powder- WP). Specimens were exposed to the C or CM models, in 28-day staining-treatment cycling. Color change (ΔE00), whiteness index (ΔWID), percentage of alteration of surface roughness (%Raalt), and gloss (%GUalt) were calculated. Additional specimens (n = 9) were indented with a Knoop diamond and subjected to 100,000 abrasion cycles. Enamel wear was determined by calculating the decrease in indentations geometry. Data were analyzed by ANOVA/Tukey tests (α = 0.05). RESULTS: The CM-model produced lower color change (staining) than C (p = 0.0001). PC, LW, WT, BW, and WP showed similar color results for both models, differing from NC (p < 0.05).%Ra and%GU did not differ among the C-model groups (p > 0.05) and WP exhibited the highest variation (%Ra and%GU) under CM-model. Enamel wear values were lowest in the NC and PC groups, intermediate for LW, WT, BW, and highest for the WP (p < 0.05). CONCLUSION: Activated charcoal-based dentifrices have a similar ability to minimize tooth staining as the conventional toothpaste, with increased enamel wear potential in the long term (after 100,000 cycles). The activated charcoal powder damaged the enamel surface, showing a higher deleterious effect on enamel roughness, gloss, and wear. CLINICAL SIGNIFICANCE: Dentifrices containing activated charcoal do not provide superior results to minimize tooth staining compared to conventional toothpaste. Charcoal powder should be used with caution because it promotes higher superficial alterations on the enamel surface.


Assuntos
Dentifrícios , Cremes Dentais , Bovinos , Animais , Carvão Vegetal , Corantes , Pós , Escovação Dentária
13.
Can Assoc Radiol J ; 75(1): 136-142, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-37339165

RESUMO

Background and Purpose: Evidence has emerged for an association between degenerative disc disease (DDD) and multiple sclerosis (MS). The purpose of the current study is to determine the presence and extent of cervical DDD in young patients (age <35) with MS, an age cohort that is less well studied for these changes. Methods: Retrospective chart review of consecutive patients aged <35 referred from the local MS clinic who were MRI scanned between May 2005 and November 2014. 80 patients (51 female and 29 male) with MS of any type ranging between 16 and 32 years of age (average 26) were included. Images were reviewed by 3 raters and assessed for presence and extent of DDD, as well as cord signal abnormalities. Interrater agreement was assessed using Kendall's W and Fleiss' Kappa statistics. Results: Substantial to very good interrater agreement was observed using our novel DDD grading scale. At least some degree of DDD was found in over 91% of patients. The majority scored mild (grade 1, 30-49%) to moderate (grade 2, 39-51%) degenerative changes. Cord signal abnormality was seen in 56-63%. Cord signal abnormality, when present, occurred exclusively at degenerative disc levels in only 10-15%, significantly lower than other distributions (P < .001 for all pairwise comparisons). Conclusions: MS patients demonstrate unexpected cervical DDD even at a young age. Future study is warranted to investigate the underlying etiology, such as altered biomechanics. Furthermore, cord lesions were found to occur independently of DDD.


Assuntos
Degeneração do Disco Intervertebral , Esclerose Múltipla , Humanos , Masculino , Feminino , Adolescente , Adulto Jovem , Adulto , Degeneração do Disco Intervertebral/patologia , Estudos Retrospectivos , Imageamento por Ressonância Magnética/métodos
14.
Ann Plast Surg ; 91(6): 731-733, 2023 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-38079317

RESUMO

BACKGROUND: Damage to the vascular system resulting from radiotherapy and previous surgeries in patients with recurrent neck tumors has a negative impact on secondary reconstructions. In this study, we describe a simple method for occlusion of the great vessels of the neck in patients with difficult access to recipient vessels for anastomosis. METHODS: A 1 or 0 gauge silk ligature is placed at a circumference of 540 degrees around the vessel, holding the base of the suture with a fine hemostatic clamp exerting sufficient pressure to stop the blood flow in the vessel (internal carotid artery or internal jugular vein), to prepare the end-to-side anastomosis to the flap. RESULTS: From 90 head a neck reconstructions for oncologic patients using microvascular flaps performed between April 2011 and April 2021, 8 of them (8.8%) were performed in patients with multiple previous surgeries and/or radiotherapy, with lesion of the arterial thyrolyngopharyngofacial trunk and secondary recipient veins, being the internal carotid and internal jugular the only available recipient vessels in the neck. CONCLUSIONS: Occlusion of the great vessels of the neck with a thick silk at 540 degrees held by a hemostatic clamp at its base is a safe and reproducible method for occlusion of these vessels to perform end-to-side anastomosis in patients with difficult vascular access in the neck without increasing the risk of endothelial damage and thrombosis from the anastomosis.


Assuntos
Neoplasias de Cabeça e Pescoço , Hemostáticos , Humanos , Veias Jugulares/cirurgia , Artéria Carótida Interna/cirurgia , Constrição , Recidiva Local de Neoplasia/cirurgia , Pescoço/cirurgia , Pescoço/irrigação sanguínea , Neoplasias de Cabeça e Pescoço/cirurgia , Anastomose Cirúrgica/métodos
15.
Clin Teach ; : e13709, 2023 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-38099405

RESUMO

BACKGROUND: Clinicians must learn to care for patients from different cultures. They must also work in teams for optimal outcomes. Few studies have analysed the intersection of cross-cultural care and interprofessional education. We completed a needs assessment to determine what paediatric residents and nurses view as essential cross-cultural components. METHODS: We led a sequential mixed-methods study of residents and nurses at an urban tertiary care centre. We administered the 'Residency Training in Cross Cultural Care' instrument. Survey results informed focus group interview guide development. Thematic analysis of qualitative data was conducted following the five stages to qualitative research framework. FINDINGS: Thirty-five residents (70%) and 46 nurses (66%) completed the survey. Five residents and six nurses attended a focus group. Five themes resulted: 1) lack of clinician diversity and cross-cultural training, 2) effective cross-cultural care not always delivered, 3) multiple challenges for delivery of effective cross-cultural care, 4) call to action for enhanced cross-cultural education and 5) different cross-cultural educational needs between nurses and residents. DISCUSSION: Residents and nurses conveyed that meaningful cross-cultural care education is imperative, lacking, and must offer skills to improve patient care. They call for a robust cross-cultural curriculum that is up to date and teaches about intersectionality. CONCLUSION: We have used this data to implement interprofessional interventions to meet their unique learning needs and enhance upstander skills by using facilitated discussions of techniques, case studies and role plays. Ultimately, teaching all clinicians to care for patients of other cultures may lead to more equitable care.

16.
Nat Commun ; 14(1): 8315, 2023 Dec 14.
Artigo em Inglês | MEDLINE | ID: mdl-38097648

RESUMO

The strategies adopted by viruses to reprogram the translation and protein quality control machinery and promote infection are poorly understood. Here, we report that the viral ubiquitin deconjugase (vDUB)-encoded in the large tegument protein of Epstein-Barr virus (EBV BPLF1)-regulates the ribosomal quality control (RQC) and integrated stress responses (ISR). The vDUB participates in protein complexes that include the RQC ubiquitin ligases ZNF598 and LTN1. Upon ribosomal stalling, the vDUB counteracts the ubiquitination of the 40 S particle and inhibits the degradation of translation-stalled polypeptides by the proteasome. Impairment of the RQC correlates with the readthrough of stall-inducing mRNAs and with activation of a GCN2-dependent ISR that redirects translation towards upstream open reading frames (uORFs)- and internal ribosome entry sites (IRES)-containing transcripts. Physiological levels of active BPLF1 promote the translation of the EBV Nuclear Antigen (EBNA)1 mRNA in productively infected cells and enhance the release of progeny virus, pointing to a pivotal role of the vDUB in the translation reprogramming that enables efficient virus production.


Assuntos
Infecções por Vírus Epstein-Barr , Ubiquitina , Humanos , Ubiquitina/metabolismo , Infecções por Vírus Epstein-Barr/metabolismo , Herpesvirus Humano 4/genética , Herpesvirus Humano 4/metabolismo , Ribossomos/metabolismo , Ubiquitinação , Proteínas/metabolismo , Ubiquitina-Proteína Ligases/genética , Ubiquitina-Proteína Ligases/metabolismo , Biossíntese de Proteínas , Proteínas de Transporte/metabolismo
17.
J. optom. (Internet) ; 16(4): 252-260, October - December 2023. tab, graf
Artigo em Inglês | IBECS | ID: ibc-225614

RESUMO

Purpose: To assess the agreement between the Eye Refract, an instrument to perform subjective automated refraction, and the traditional subjective refraction, as the gold standard, in young hyperopes under noncycloplegic and cycloplegic conditions. Methods: A cross-section and randomized study was carried out, involving 42 participants (18.2 ± 7.7 years, range 6 to 31 years). Only one eye was chosen for the analysis, randomly. An optometrist conducted the refraction with the Eye Refract, while another different optometrist conducted the traditional subjective refraction. Spherical equivalent (M), cylindrical components (J0 and J45), and corrected distance visual acuity (CDVA) were compared between both refraction methods under noncycloplegic and cycloplegic conditions. A Bland-Altman analysis was performed to assess the agreement (accuracy and precision) between both refraction methods. Results: Without cycloplegia, the Eye Refract showed significantly lower values of hyperopia than the traditional subjective refraction (p < 0.009), the mean difference (accuracy) and its 95% limits of agreement (precision) being -0.31 (+0.85, -1.47) D. Conversely, there were no statistical differences between both refraction methods under cycloplegic conditions (p ≥ 0.05). Regarding J0 and J45, both refraction methods manifested no significant differences between them under noncycloplegic and cycloplegic conditions (p ≥ 0.05). Finally, the Eye Refract significantly improved CDVA (0.04 ± 0.01 logMAR) compared with the traditional subjective refraction without cycloplegia (p = 0.01). Conclusions: The Eye Refract is presented as a useful instrument to determine the refractive error in young hyperopes, the use of cycloplegia being necessary to obtain accurate and precise spherical refraction. (AU)


Assuntos
Criança , Adolescente , Adulto Jovem , Adulto , Midriáticos , Refração Ocular/efeitos dos fármacos , Hiperopia , Optometristas
19.
Implement Sci Commun ; 4(1): 139, 2023 Nov 16.
Artigo em Inglês | MEDLINE | ID: mdl-37974245

RESUMO

BACKGROUND: To address the evolving needs and context changes due to the COVID-19 pandemic, we adapted Connect for Health, an evidence-based, primary care, pediatric weight management intervention. The objective of this study is to describe the planned adaptation process to ensure continued and equitable program uptake during the pandemic. METHODS: Guided by adaptation frameworks, we identified the core functions and forms of Connect for Health and then adapted the intervention in response to a changing healthcare context. We engaged stakeholders and surveyed parents of children with a BMI ≥ 85th percentile and pediatric clinicians and examined their experiences using telehealth for pediatric weight management and needs and preferences. Using multivariable logistic regression, we examined the preferences of parents with limited English proficiency regarding key aspects of pediatric weight management. RESULTS: We surveyed 200 parents and 43% had a primary language of Spanish. Parents wanted care to be a combination of in-person and virtual visits (80%). We found that parents with limited English proficiency had a higher odds ratio of affirming in-person visits are better than virtual visits for ensuring their child's health concern can be taken care of (OR: 2.91; 95% CI: 1.36, 6.21), feeling comfortable when discussing personal information (OR: 3.91; 95% CI: 1.82, 8.43), talking about healthy behaviors and setting goals (OR: 3.09; 95% CI: 1.39, 6.90), and talking about mental health and overall well-being (OR: 4.02; 95% CI: 1.83, 8.87) than parents without limited English proficiency. We surveyed 75 clinicians and 60% felt telehealth was a useful tool to provide care for pediatric weight management. Clinicians felt virtual visits did not pose barriers to all aspects of care. Informed by the surveys and stakeholder input, we made clinician- and family-level adaptations while retaining the program's function. CONCLUSIONS: By engaging stakeholders and adapting the program for telehealth, we optimized the reach and fit of Connect for Health to ensure its continued uptake. We have provided a real-world example of how clinical innovations can evolve and how to systematically plan adaptations in response to changing healthcare contexts. TRIAL REGISTRATION: Clinicaltrials.gov (NCT04042493), Registered on August 2, 2019.

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