Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 619
Filtrar
1.
Ecol Evol ; 14(9): e70274, 2024 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-39267691

RESUMO

Birds time their life cycle events to favourable windows in environmental conditions. In tropical environments, where photoperiod variation is small, birds show high variability in the timing of life cycle stages, yet these species have been severely underrepresented in phenology research. Here, we investigated temporal patterns in bird life cycles and resource availability in two sites in tropical Africa: Weppa (Nigeria, 7° N) and Elat (Cameroon, 3° N). In these sites we captured common bulbuls (Pycnonotus barbatus), a widespread generalist, and recorded breeding and moult over a 12-month period. Simultaneously, we surveyed fruiting tree and arthropod abundance. Our aim was to quantify seasonal patterns in moult and breeding in bulbuls at both sites, and link them to fluctuations in local fruit and arthropod abundance and precipitation. Moult was more seasonal than breeding in both sites, and seasonality of both life cycle events was stronger in Nigeria than Cameroon. The peak timing for moult was 1.5 months earlier in Nigeria than Cameroon. Seasonal variation in abundance of fruiting trees and arthropods was different between sites, as were the associations with breeding and moulting. In Nigeria, we found a positive association between moult and arthropod abundance, and a negative one with fruiting tree abundance. In contrast, in Cameroon moult was associated with higher precipitation, while breeding occurred at times with higher fruit abundance. Our results provide evidence that, even in similar habitats separated by four degrees in latitude, seasonal patterns across three trophic levels are variable. Understanding links between environmental conditions and life cycle events can reveal potential vulnerabilities of tropical species, and guide conservation efforts.

2.
Sci Data ; 11(1): 859, 2024 Aug 09.
Artigo em Inglês | MEDLINE | ID: mdl-39122750

RESUMO

Computational and machine learning approaches to model the conformational landscape of macrocyclic peptides have the potential to enable rational design and optimization. However, accurate, fast, and scalable methods for modeling macrocycle geometries remain elusive. Recent deep learning approaches have significantly accelerated protein structure prediction and the generation of small-molecule conformational ensembles, yet similar progress has not been made for macrocyclic peptides due to their unique properties. Here, we introduce CREMP, a resource generated for the rapid development and evaluation of machine learning models for macrocyclic peptides. CREMP contains 36,198 unique macrocyclic peptides and their high-quality structural ensembles generated using the Conformer-Rotamer Ensemble Sampling Tool (CREST). Altogether, this new dataset contains nearly 31.3 million unique macrocycle geometries, each annotated with energies derived from semi-empirical extended tight-binding (xTB) DFT calculations. Additionally, we include 3,258 macrocycles with reported passive permeability data to couple conformational ensembles to experiment. We anticipate that this dataset will enable the development of machine learning models that can improve peptide design and optimization for novel therapeutics.


Assuntos
Aprendizado de Máquina , Peptídeos/química , Conformação Proteica , Compostos Macrocíclicos/química , Peptídeos Cíclicos/química
3.
J Neurosci ; 44(36)2024 Sep 04.
Artigo em Inglês | MEDLINE | ID: mdl-39103222

RESUMO

While the influence of context on long-term memory (LTM) is well documented, its effects on the interaction between working memory (WM) and LTM remain less understood. In this study, we explored these interactions using a delayed match-to-sample task, where participants (6 males, 16 females) encountered the same target object across six consecutive trials, facilitating the transition from WM to LTM. During half of these target repetitions, the background color changed. We measured the WM storage of the target using the contralateral delay activity in electroencephalography. Our results reveal that task-irrelevant context changes trigger the reactivation of long-term memories in WM. This reactivation may be attributed to content-context binding in WM and hippocampal pattern separation.


Assuntos
Eletroencefalografia , Memória de Longo Prazo , Memória de Curto Prazo , Humanos , Masculino , Feminino , Adulto Jovem , Memória de Curto Prazo/fisiologia , Adulto , Memória de Longo Prazo/fisiologia , Hipocampo/fisiologia
4.
Artigo em Inglês | MEDLINE | ID: mdl-39052393

RESUMO

Findings from recent studies indicate that planning an action toward an object strengthens its visual working memory (VWM) representation, emphasizing the importance of sensorimotor links in VWM. In the present study, we investigated to what extent such sensorimotor links are modulated by how well-defined an action plan is. In three eye-tracking experiments, we asked participants to memorize a visual stimulus for a subsequent memory test, whereby they performed a specific hand movement toward memory-matching probes. We manipulated action uncertainty so that in the defined action condition, participants knew before the memory delay what specific action they would have to perform at the memory test, while in the undefined action condition, they were informed about the specific action on the object in VWM only after the delay. Importantly, during the delay, participants were presented with a visual detection task, designed to measure any attentional biases toward the memorized object. Across the three experiments, we found moderate evidence that knowing in advance how to act on an object prioritized its mnemonic representation, as expressed in an increased attentional bias toward it. Our results support the idea that knowing what action to perform on an object strengthens its representation in VWM, and further highlight the importance of considering action in the study of VWM. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

5.
Nat Commun ; 15(1): 6124, 2024 Jul 20.
Artigo em Inglês | MEDLINE | ID: mdl-39033137

RESUMO

Insulin icodec is a once-weekly insulin analogue that has a long half-life of approximately 7 days, making it suitable for once weekly dosing. The Insulin icodec molecule was developed based on the hypothesis that lowering insulin receptor affinity and introducing a strong albumin-binding moiety would result in a long insulin half-life, provided that non-receptor-mediated clearance is diminished. Here, we report an insulin clearance mechanism, resulting in the splitting of insulin molecules into its A-chain and B-chain by a thiol-disulphide exchange reaction. Even though the substitutions in insulin icodec significantly stabilise insulin against such degradation, some free B-chain is observed in plasma samples from minipigs and people with type 2 diabetes. In summary, we identify thiol-disulphide exchange reactions to be an important insulin clearance mechanism and find that stabilising insulin icodec towards this reaction significantly contributes to its long pharmacokinetic/pharmacodynamic profile.


Assuntos
Diabetes Mellitus Tipo 2 , Dissulfetos , Insulina , Animais , Humanos , Masculino , Diabetes Mellitus Tipo 2/tratamento farmacológico , Diabetes Mellitus Tipo 2/metabolismo , Diabetes Mellitus Tipo 2/sangue , Dissulfetos/química , Meia-Vida , Hipoglicemiantes/administração & dosagem , Hipoglicemiantes/farmacocinética , Hipoglicemiantes/química , Insulina/administração & dosagem , Insulina/metabolismo , Insulina/química , Insulina/farmacocinética , Receptor de Insulina/metabolismo , Compostos de Sulfidrila/química , Suínos , Porco Miniatura
6.
Sci Adv ; 10(25): eadm9216, 2024 Jun 21.
Artigo em Inglês | MEDLINE | ID: mdl-38905340

RESUMO

Ufmylation is implicated in multiple cellular processes, but little is known about its functions and regulation in protein trafficking. Here, we demonstrate that the genetic depletion of core components of the ufmylation cascade, including ubiquitin-fold modifier 1 (UFM1), UFM1 activation enzyme 5, UFM1-specific ligase 1 (UFL1), UFM1-specific protease 2, and UFM1-binding protein 1 (UFBP1) each markedly inhibits the endoplasmic reticulum (ER)-Golgi transport, surface delivery, and recruitment to COPII vesicles of a subset of G protein-coupled receptors (GPCRs) and UFBP1's function partially relies on UFM1 conjugation. We also show that UFBP1 and UFL1 interact with GPCRs and UFBP1 localizes at COPII vesicles coated with specific Sec24 isoforms. Furthermore, the UFBP1/UFL1-binding domain identified in the receptors effectively converts non-GPCR protein transport into the ufmylation-dependent pathway. Collectively, these data reveal important functions for the ufmylation system in GPCR recruitment to COPII vesicles, biosynthetic transport, and sorting at ER via UFBP1 ufmylation and interaction directly.


Assuntos
Vesículas Revestidas pelo Complexo de Proteína do Envoltório , Retículo Endoplasmático , Transporte Proteico , Receptores Acoplados a Proteínas G , Vesículas Revestidas pelo Complexo de Proteína do Envoltório/metabolismo , Retículo Endoplasmático/metabolismo , Receptores Acoplados a Proteínas G/metabolismo , Receptores Acoplados a Proteínas G/genética , Humanos , Complexo de Golgi/metabolismo , Ligação Proteica , Proteínas de Transporte Vesicular/metabolismo , Proteínas de Transporte Vesicular/genética , Células HEK293 , Células HeLa , Proteínas
7.
Int J Parasitol Drugs Drug Resist ; 25: 100546, 2024 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-38733883

RESUMO

Schistosomiasis caused by Schistosoma spp. is a disease that causes a considerable health burden to millions of people worldwide. The limited availability of effective drugs on the market and the increased risk of resistance development due to extensive usage, highlight the urgent need for new antischistosomal drugs. Recent studies have shown that robenidine derivatives, containing an aminoguanidine core, exhibit promising activities against Plasmodium falciparum, motivating further investigation into their efficacy against Schistosoma mansoni, due to their similar habitat and the resulting related cellular mechanisms like the heme detoxification pathway. The conducted phenotypic screening of robenidine and 80 derivatives against newly transformed schistosomula and adult Schistosoma mansoni yielded 11 candidates with low EC50 values for newly transformed schistosomula (1.12-4.63 µM) and adults (2.78-9.47 µM). The structure-activity relationship revealed that electron-withdrawing groups at the phenyl moiety, as well as the presence of methyl groups adjacent to the guanidine moiety, enhanced the activity of derivatives against both stages of Schistosoma mansoni. The two compounds 2,2'-Bis[(3-cyano-4-fluorophenyl)methylene] carbonimidic Dihydrazide Hydrochloride (1) and 2,2'-Bis[(4-difluoromethoxyphenyl) ethylidene] carbonimidic Dihydrazide Hydrochloride (19), were selected for an in vivo study in Schistosoma mansoni-infected mice based on their potency, cytotoxicity, pharmacokinetic-, and physicochemical properties, but failed to reduce the worm burden significantly (worm burden reduction <20%). Thus, robenidine derivatives require further refinements to obtain higher antischistosomal specificity and in vivo activity.


Assuntos
Guanidinas , Schistosoma mansoni , Esquistossomose mansoni , Esquistossomicidas , Animais , Schistosoma mansoni/efeitos dos fármacos , Camundongos , Esquistossomicidas/farmacologia , Esquistossomose mansoni/tratamento farmacológico , Esquistossomose mansoni/parasitologia , Relação Estrutura-Atividade , Guanidinas/farmacologia , Guanidinas/química , Feminino , Masculino
8.
Future Sci OA ; 10(1): FSO982, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38817369

RESUMO

Aim: This study evaluated the levels of anti-insulin antibodies (AIAs) and the influence of some antidiabetic medications on AIA in diabetes mellitus (DM) patients with retinopathy. Patient & methods: An observational cross-sectional study. Results: A lower titer of AIA IgG was observed in the diabetic retinopathy (DR) and DM-only study categories compared with the control group [DR = 86 (5-560), DM-only = 50 (5-500), versus control = 200 (7-565); p = 0.017]. Taking nifedipine and metformin were negatively correlated (r = -0.32, p = 0.04) with the levels of AIA IgE in the DR group. Conclusion: A decreased titer of circulating AIAs was observed in the DR study category, suggesting that AIA may not contribute to the pathogenesis of DR.


Diabetic retinopathy (DR) is the main reason people lose their sight in countries with few resources. Anti-insulin antibodies, or AIAs, help the body fight off infections and may play a role in the development of DR. The study looked at how much AIA was in DR patients and how some diabetes drugs affected AIA levels. There was a negative link between nifedipine and one AIA (IgE) in people with DR, but a positive link between metformin and another AIA (IgG). AIA levels were lower in the DR study group, which suggests that AIA may not cause DR.

9.
Cureus ; 16(4): e58553, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38765327

RESUMO

The systematic review investigates the impact of different nutrients and dietary patterns on metabolism and immunity to answer the research question: "Can personalized nutritional approaches boost immunity?" The importance of diet in supporting the immune system has come to light in today's environment, where a strong immune system is crucial for protection against infectious illnesses, as highlighted by the COVID-19 pandemic. This systematic review adhered to the guidelines outlined in the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) 2020. Four databases were screened for relevant data published in 2022-2023: PubMed, PubMed Central (PMC), MEDLINE, and Cochrane Library. Inclusion and exclusion criteria were utilized, and 13 papers were finalized after screening and employing the quality appraisal tool Cochrane Bias assessment for randomized controlled trials (RCT). Personalized nutrition can strengthen immunity and enhance overall health by adjusting dietary recommendations and following a person's genetic makeup, lifestyle, and health state. An adequate supply of vitamins, minerals, proteins, and fatty acids as well as an optimum caloric intake are essential for immune health, and individual requirements can vary significantly due to genetic factors, lifestyle choices, and underlying health conditions. Personalized nutrition considers these factors, enabling tailored dietary recommendations to address specific nutrient needs and optimize nutrient intake, leading to better health outcomes. The review concludes that personalized nutrition is more effective than a one-size-fits-all approach in boosting immunity, and its potential impact on health and immune function is highly important.

10.
Cureus ; 16(4): e58306, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38752062

RESUMO

Irritable bowel syndrome (IBS) is a common functional gastrointestinal (GI) condition, and changes in the gut microbiota's composition contribute to the development of symptoms. Although the precise mechanisms of probiotic use in the human body are not fully understood, probiotic supplements are believed to reduce symptoms, such as abdominal pain, by regulating neurotransmitters and receptors associated with pain modulation in IBS patients compared to placebo by altering the gut flora. This systematic review aimed to assess the most current randomized controlled trials (RCTs) on how probiotic supplementation affects the symptoms in people with IBS. The effects of probiotic supplements on IBS symptoms were studied in RCTs published between January 2018 and June 2023. After a search through PubMed and Google Scholar using the keywords probiotics, gut microbiota, irritable bowel syndrome, and IBS; eight articles matched the inclusion criteria and were reviewed. Four trials used a multistrain probiotic, whereas the remaining four trials examined the effects of a monostrain supplement. All eight trials came to the same conclusion: Probiotic treatment may significantly reduce symptoms.

11.
Nat Commun ; 15(1): 4584, 2024 May 29.
Artigo em Inglês | MEDLINE | ID: mdl-38811577

RESUMO

Stimulator of interferon genes (STING) is a central component of the cytosolic nucleic acids sensing pathway and as such master regulator of the type I interferon response. Due to its critical role in physiology and its' involvement in a variety of diseases, STING has been a focus for drug discovery. Targeted protein degradation (TPD) has emerged as a promising pharmacology for targeting previously considered undruggable proteins by hijacking the cellular ubiquitin proteasome system (UPS) with small molecules. Here, we identify AK59 as a STING degrader leveraging HERC4, a HECT-domain E3 ligase. Additionally, our data reveals that AK59 is effective on the common pathological STING mutations, suggesting a potential clinical application of this mechanism. Thus, these findings introduce HERC4 to the fields of TPD and of compound-induced degradation of STING, suggesting potential therapeutic applications.


Assuntos
Proteínas de Membrana , Proteólise , Ubiquitina-Proteína Ligases , Ubiquitina-Proteína Ligases/metabolismo , Ubiquitina-Proteína Ligases/genética , Humanos , Proteínas de Membrana/metabolismo , Proteínas de Membrana/genética , Proteólise/efeitos dos fármacos , Células HEK293 , Animais , Mutação , Complexo de Endopeptidases do Proteassoma/metabolismo , Ubiquitinação
12.
Cureus ; 16(3): e55980, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38606271

RESUMO

As the global incidence of idiopathic pulmonary fibrosis (IPF) is on the rise, there is a need for better diagnostic criteria, better treatment options, early and appropriate diagnosis, adequate care, and a multidisciplinary approach to the management of patients. This systematic review explores the role of proton pump inhibitors (PPIs) in IPF and answers the question, "Does proton pump inhibitor improve only the prognosis of gastroesophageal associated idiopathic pulmonary fibrosis or for other types of idiopathic pulmonary fibrosis too?" We used PubMed (PMC) and Google Scholar for data collection for this systematic review and followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines for conducting this review. After in-depth literature screening and quality appraisal, 12 articles were selected for this systematic review. On the one hand, the efficacy of PPI therapy is supported by research such as the CAPACITY and ASCEND trials, a pilot randomized control trial (RCT) investigating the role of omeprazole in IPF and a bidirectional two-sample Mendelian randomization (MR) study, respectively. On the other hand, a systematic review and meta-analysis on antacid and antireflux surgery in IPF negate these results and show no statistical significance. Questions regarding the efficacy of PPI therapy must be dealt with in an adequately powered multicenter and double-blinded randomized control trial. The anti-inflammatory properties of antacids can serve as the cornerstone for future trials. In the following systematic review, antacid, antireflux therapy, omeprazole, and proton pump therapy are synonymous with stomach acid suppression therapy.

13.
J Emerg Nurs ; 50(4): 523-536, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38573297

RESUMO

INTRODUCTION: Charge nurses are shift leaders whose role includes managing nursing resources and facilitating appropriate patient care; in emergency departments, the charge nurse role requires both clinical and leadership skills to facilitate the flow of patients, while ensuring patient and staff safety. Literature on orientation and specific training is notably sparse. This study aimed to evaluate the content and process of core competency training and identify evaluation and implementation strategies necessary to improve charge nurse performance in United States emergency departments. METHODS: A modified Delphi technique was used in phase 1 and a qualitative content analysis method was used in phase 2 to address specific aims of the study. RESULTS: In total, 427 emergency nurse managers, directors, educators, and charge nurses responded to the initial survey to identify elements, teaching modalities, and evaluative processes; 22 participated in 1 of 2 focus groups to provide further information about the pedagogical approaches to teaching emergency charge nurse competencies. The top 5 competencies were identified as patient flow management, communication, situational awareness, clinical decision making, and nurse-patient assignment, with understanding that each competency overlapped significantly with the others. Low-fidelity simulation and gamification were identified as a preferred method of both training and evaluation. DISCUSSION: These findings have the potential to support a standardized approach to emergency charge nurse training and evaluation focusing on communication skills, clinical decision making, and situational awareness to facilitate safe and effective nurse-patient assignment and emergency department throughput.


Assuntos
Competência Clínica , Técnica Delphi , Enfermagem em Emergência , Serviço Hospitalar de Emergência , Humanos , Enfermagem em Emergência/educação , Estados Unidos , Inquéritos e Questionários , Supervisão de Enfermagem , Grupos Focais
14.
J Med Entomol ; 61(4): 1086-1090, 2024 Jul 12.
Artigo em Inglês | MEDLINE | ID: mdl-38686844

RESUMO

Borrelia miyamotoi disease is an emerging tick-borne human illness in the United States caused by Borrelia miyamotoi (Spirochaetales: Spirochaetaceae) bacterium. With Pennsylvania reporting thousands of tick-borne disease cases annually, determining the minimum infection rate (MIR) of B. miyamotoi in Ixodes scapularis (Say, Acari: Ixodidae) adults within Pennsylvania is of utmost importance. Active surveillance was performed from October 2019 to April 2020 to collect a minimum of 50 I. scapularis ticks from every county within Pennsylvania and then screened for B. miyamotoi via qPCR. Ticks were collected from all 67 counties with the majority of those being adult I. scapularis. Additional ticks collected were Dermacentor albipictus (Packard, Acari: Ixodidae), Haemaphysalis longicornis (Neumann, Acari: Ixodidae), and immature I. scapularis. Adult I. scapularis were pooled and tested for B. miyamotoi. MIR for positive B. miyamotoi pools and density of infected adult I. scapularis varied by county, with positive pools from 38 Pennsylvania counties. This is the first statewide evaluation of B. miyamotoi in Pennsylvania in questing adult I. scapularis. These prevalence and distribution data will aid health care practitioners within the state of Pennsylvania and the northeast United States to understand potential risk and bring awareness to the lesser known human Borrelia illness, Borrelia miyamotoi disease.


Assuntos
Borrelia , Ixodes , Animais , Pennsylvania/epidemiologia , Borrelia/isolamento & purificação , Ixodes/microbiologia , Ixodes/crescimento & desenvolvimento , Feminino , Masculino , Spirochaetales/isolamento & purificação , Febre Recorrente/transmissão , Febre Recorrente/microbiologia , Febre Recorrente/epidemiologia , Humanos
15.
Cureus ; 16(3): e56704, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38646383

RESUMO

This systematic review aims to compare the efficacy and safety of a novel immunotherapy with low-dose interleukin 2 (IL2) across two of the most prevalent autoimmune diseases i.e. systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA). Contemporary therapeutic practices have not been able to achieve complete remission from these autoimmune disorders. In contrast, low-dose IL2 has shown promise in achieving this therapeutic goal via inducing self-tolerance in patients with autoimmune diseases; however, due to variable irregularities among autoimmune processes of variable diseases, the benefit of low-dose IL2 could not be determined among different autoimmune diseases. Therefore, we conducted a study to compare low-dose IL2 therapy effects on SLE and RA. We systematically screened four databases: PubMed, Medical Literature Analysis and Retrieval System Online (MEDLINE), PubMed Central (PMC), and Google Scholar. Inclusion and exclusion criteria were implemented. Quality appraisal of studies chosen for the review was done using the Cochrane Risk-of-Bias (RoB) assessment tool for randomized controlled trials, and the Newcastle-Ottawa Scale (NOS) and JBI critical appraisal tool for non-randomized clinical trials. Information was gathered from seven articles: three randomized controlled trials and four non-randomized clinical trials. Our review concluded that low-dose IL2 therapy in conjunction with respective standard therapies for SLE and RA has a higher efficacy and safety profile as compared to standard therapy alone and the therapeutic effects were comparable in both SLE and RA patients treated with low-dose IL2; however, this novel intervention does not seem to have a significant corrective effect on the biomarkers of RA as it does for SLE biomarkers.

16.
Cureus ; 16(3): e56833, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38654766

RESUMO

Limb fractures are a common cause of pediatric hospital admissions and surgeries, with a significant prevalence in the United Kingdom across all injury categories. Among psychiatric conditions in children, attention deficit hyperactivity disorder (ADHD) stands out as frequently associated with fractures, particularly those involving extremities. ADHD, with diagnoses prevalent among a significant proportion of school-age children and adolescents, has witnessed a growing global incidence. We followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) 2020 checklist for our systematic literature search, using various databases and specific search terms related to ADHD and fractures. We considered articles from 2018 to 2023, focusing on English language papers with free full-text access. Our selection process used the PRISMA flowchart. We began with 1,890 articles and, after deduplication, title screening, abstract assessment, and quality evaluation included nine research papers in our review. Our primary focus was on examining fracture-related outcomes in individuals with ADHD compared to those without, considering medication status. These studies encompassed various designs, with a focus on the ADHD-fracture relationship and methylphenidate's (MPH) impact. Our study confirms that ADHD increases fracture risk and suggests that MPH may help mitigate this risk. Early ADHD detection is vital for nonpharmacological interventions. Orthopedic surgeons should proactively identify ADHD, while healthcare professionals should offer injury prevention guidance, particularly for at-risk groups.

17.
Chem Sci ; 15(16): 6122-6129, 2024 Apr 24.
Artigo em Inglês | MEDLINE | ID: mdl-38665530

RESUMO

Macrocyclization has positioned itself as a powerful method for engineering potent peptide drug candidates. Introducing one or multiple cyclizations is a common strategy to improve properties such as affinity, bioavailability and proteolytic stability. Consequently, methodologies to create large libraries of polycyclic peptides by phage or mRNA display have emerged, allowing the rapid identification of binders to virtually any target. Yet, within those libraries, the performance of linear vs. mono- or bicyclic peptides has rarely been studied. Indeed, a key parameter to perform such a comparison is to use a display protocol and cyclization chemistry that enables the formation of all 3 formats in equal quality and diversity. Here, we developed a simple, efficient and fast mRNA display protocol which meets these criteria and can be used to generate highly diverse libraries of thioether cyclized polycyclic peptides. As a proof of concept, we selected peptides against fibroblast growth factor receptor 3c (FGFR3c) and compared the different formats regarding affinity, specificity, and human plasma stability. The peptides with the best KD's and stability were identified among bicyclic peptide hits, further strengthening the body of evidence pointing at the superiority of this class of molecules and providing functional and selective inhibitors of FGFR3c.

18.
Cell Stem Cell ; 31(4): 554-569.e17, 2024 Apr 04.
Artigo em Inglês | MEDLINE | ID: mdl-38579685

RESUMO

The YAP/Hippo pathway is an organ growth and size regulation rheostat safeguarding multiple tissue stem cell compartments. LATS kinases phosphorylate and thereby inactivate YAP, thus representing a potential direct drug target for promoting tissue regeneration. Here, we report the identification and characterization of the selective small-molecule LATS kinase inhibitor NIBR-LTSi. NIBR-LTSi activates YAP signaling, shows good oral bioavailability, and expands organoids derived from several mouse and human tissues. In tissue stem cells, NIBR-LTSi promotes proliferation, maintains stemness, and blocks differentiation in vitro and in vivo. NIBR-LTSi accelerates liver regeneration following extended hepatectomy in mice. However, increased proliferation and cell dedifferentiation in multiple organs prevent prolonged systemic LATS inhibition, thus limiting potential therapeutic benefit. Together, we report a selective LATS kinase inhibitor agonizing YAP signaling and promoting tissue regeneration in vitro and in vivo, enabling future research on the regenerative potential of the YAP/Hippo pathway.


Assuntos
Inibidores de Proteínas Quinases , Proteínas Serina-Treonina Quinases , Proteínas de Sinalização YAP , Animais , Humanos , Camundongos , Proliferação de Células , Proteínas Serina-Treonina Quinases/antagonistas & inibidores , Proteínas Serina-Treonina Quinases/metabolismo , Células-Tronco/metabolismo , Fatores de Transcrição/metabolismo , Proteínas de Sinalização YAP/agonistas , Proteínas de Sinalização YAP/efeitos dos fármacos , Proteínas de Sinalização YAP/metabolismo , Inibidores de Proteínas Quinases/química , Inibidores de Proteínas Quinases/farmacologia
19.
Psychotherapy (Chic) ; 61(2): 110-124, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38635212

RESUMO

Developing affirming interventions for transgender and nonbinary (TNB) therapy clients requires understanding their experiences with microaggressions in psychotherapy, yet no self-report measure of anti-TNB microaggressions in this context exists. Moreover, few studies have tested the associations between anti-TNB microaggressions and therapy processes. To better address the burden of unmet mental health care needs among TNB people, this three-study investigation designed and tested the psychometric properties of the Gender Identity and Expression Microaggressions in Therapy Scale (GIEMTS), a measure of TNB individuals' encounters with microaggressions in psychotherapy. Study 1 (N = 225) identified a four-factor model, comprising the themes of Educational Burdening, Lack of Affirmation, Inflation, and Invalidation. These subscales exhibited strong internal consistency reliabilities and demonstrated convergent and discriminant validity. The results of Study 2 (N = 435) replicated the four-factor structure through confirmatory factor analysis. However, bifactor analysis revealed that the Educational Burdening, Inflation, and Invalidation subscale scores were mostly accounted by a General Anti-TNB Microaggressions scale score-though Lack of Affirmation showed evidence of its independence. Also in Study 2, both scales were uniquely negatively associated with the working alliance. Study 3 (N = 151) found evidence for the test-retest reliability of GIEMTS scores over a 2-3-week period. Overall, the GIEMTS emerged as a robust and psychometrically sound instrument that captures the experiences of TNB individuals in therapy settings. The study concludes with valuable recommendations for training and clinical practice to bolster TNB mental health. (PsycInfo Database Record (c) 2024 APA, all rights reserved).


Assuntos
Agressão , Identidade de Gênero , Psicometria , Psicoterapia , Pessoas Transgênero , Humanos , Feminino , Masculino , Adulto , Reprodutibilidade dos Testes , Pessoas Transgênero/psicologia , Psicoterapia/métodos , Agressão/psicologia , Pessoa de Meia-Idade , Adulto Jovem , Inquéritos e Questionários , Adolescente , Análise Fatorial
20.
Environ Pollut ; 349: 123887, 2024 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-38554838

RESUMO

To investigate the formation and leaching potential of degradation products N,N-dimethylsulfamide (DMS) and dimethylsulfamic acid (DMSA) from cyazofamid under real-world agricultural conditions, the fungicide cyazofamid was applied in a potato crop as part of the Danish Pesticide Leaching Assessment Programme (PLAP). Leaching of DMS, DMSA, 4-chloro-5-(4-methylphenyl)-1H-imidazole-2-carbonitrile (CCIM), and 4-chloro-5-(4-methylphenyl)-1H-imidazole-2-carboxylicacid (CTCA) was monitored in water from the variably saturated zone (suction cups) and groundwater for more than two years following the applications. In total, 424 samples were analyzed for the content of the four degradation products. An additional laboratory study was executed in parallel with the field monitoring study. Here, cyazofamid was applied to soil columns and leaching of the four degradation products was studied under controlled conditions. In the EFSA conclusion on cyazofamid, CCIM and CTCA are mentioned as major relevant metabolites; DMS is not mentioned in the risk assessment and DMSA is only included in acute oral toxicity studies and an in vitro bacterial mutation assay. In contrast to the EFSA conclusion on cyazofamid, our studies showed no leaching of the two major metabolites, CTCA and CCIM, but instead, major leaching of DMS and DMSA in both the field and laboratory studies was observed. That is, both DMS and DMSA leached to the groundwater in concentrations >0.1 µg/L for more than half a year. Based on this, we suggest improvements to the current pesticide risk assessment.


Assuntos
Fungicidas Industriais , Água Subterrânea , Sulfonamidas , Poluentes Químicos da Água , Água Subterrânea/química , Poluentes Químicos da Água/análise , Medição de Risco , Monitoramento Ambiental , Praguicidas/análise , Imidazóis/toxicidade , Imidazóis/análise
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA