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1.
Article de Anglais | MEDLINE | ID: mdl-38770399

RÉSUMÉ

Objective: The population-based colorectal cancer screening guidelines in Japan recommend an annual fecal immunochemical test (FIT). However, there is no consensus on the need for annual FIT screening for patients who recently performed a total colonoscopy (TCS). Therefore, we evaluated the repeated TCS results for patients with positive FIT after a recent TCS to assess the necessity of an annual FIT. Methods: We reviewed patients with positive FIT in opportunistic screening from April 2017 to March 2022. The patients were divided into two groups: those who had undergone TCS within the previous 5 years (previous TCS group) and those who had not (non-previous TCS group). We compared the detection rates of advanced neoplasia and colorectal cancer between the two groups. Results: Of 671 patients, 151 had received TCS within 5 years and 520 had not. The detection rates of advanced neoplasia in the previous TCS and non-previous TCS groups were 4.6% and 12.1%, respectively (p < 0.01), and the colorectal cancer detection rates were 0.7% and 1.5%, respectively (no significant difference). The adenoma detection rates were 33.8% in the previous TCS group and 40.0% in the non-previous TCS group (no significant difference). Conclusions: Only a few patients were diagnosed with advanced neoplasia among the patients with FIT positive after a recent TCS. For patients with adenomatous lesions on previous TCS, repeated TCS should be performed according to the surveillance program without an annual FIT. The need for an annual FIT for patients without adenomatous lesions on previous TCS should be prospectively assessed in the future.

2.
Int J Eat Disord ; 2024 Jul 11.
Article de Anglais | MEDLINE | ID: mdl-38989608

RÉSUMÉ

OBJECTIVE: We aimed to explore US veteran perspectives on eating disorder screening, diagnosis, patient-provider conversations, and care in the Veterans Health Administration (VHA). METHOD: Rapid qualitative analysis of 30-45 min phone interviews with 16 (N = 16) veterans with an electronic health record ICD-10 eating disorder diagnosis, who received care at one of two VHA healthcare systems in Connecticut or California. Topics covered included: conversations with providers about eating disorder symptoms, diagnosis, and referral to treatment; feedback about an eating disorder screener, and; reflections on eating disorders among veterans and VHA's effort to address them. RESULTS: Most veterans reported difficulty understanding and defining the problems they were experiencing and self-diagnosed their eating disorder before discussing it with a provider. Treatment referrals were almost universally for being overweight rather than for an eating disorder, often leading veterans to feel misunderstood or marginalized. Overall, veterans were enthusiastic about the screener, preferred screening to be conducted by primary care providers, and noted that conversations needed to be non-stigmatizing. There was consensus that VHA is not doing enough to address this issue, that group support and therapy could be beneficial, and that resources needed to be centralized and accessible. DISCUSSION: For the most part, veterans felt that, at best, eating disorders and disordered eating are overlooked, and at worst, conflated with overweight. The majority of veterans got referred for weight loss or weight management services but would welcome the opportunity to be screened for, and referred to, eating disorder treatment.

3.
Nano Lett ; 2024 Jul 11.
Article de Anglais | MEDLINE | ID: mdl-38989682

RÉSUMÉ

Parlous structure integrity of the cathode and erratic interfacial microdynamics under high potential take responsibility for the degradation of solid-state lithium metal batteries (LMBs). Here, high-voltage LMBs have been operated by modulating the polymer electrolyte intrinsic structure through an intermediate dielectric constant solvent and further inducing the gradient solid-state electrolyte interphase. Benefiting from the chemical adsorption between trimethyl phosphate (TMP) and the cathode, the gradient interphase rich in LiPFxOy and LiF is induced, thereby ensuring the structural integrity and interface compatibility of the commercial LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode even at the 4.9 V cutoff voltage. Eventually, the specific capacity of NCM811|Li full cell based on TMP-modulated polymer electrolyte increased by 27.7% from 4.5 to 4.9 V. Such a universal screening method of electrolyte solvents and its derived electrode interfacial manipulation strategy opens fresh avenues for quasi-solid-state LMBs with high specific energy.

4.
Int J Cancer ; 2024 Jul 11.
Article de Anglais | MEDLINE | ID: mdl-38989802

RÉSUMÉ

We aimed to determine the value of standalone and supplemental automated breast ultrasound (ABUS) in detecting cancers in an opportunistic screening setting with digital breast tomosynthesis (DBT) and compare this combined screening method to DBT and ABUS alone in women older than 39 years with BI-RADS B-D density categories. In this prospective opportunistic screening study, 3466 women aged 39 or older with BI-RADS B-D density categories and with a mean age of 50 were included. The screening protocol consisted of DBT mediolateral-oblique views, 2D craniocaudal views, and ABUS with three projections for both breasts. ABUS was evaluated blinded to mammography findings. Statistical analysis evaluated diagnostic performance for DBT, ABUS, and combined workflows. Twenty-nine cancers were screen-detected. ABUS and DBT exhibited the same cancer detection rates (CDR) at 7.5/1000 whereas DBT + ABUS showed 8.4/1000, with ABUS contributing an additional CDR of 0.9/1000. Standalone ABUS outperformed DBT in detecting 12.5% more invasive cancers. DBT displayed better accuracy (95%) compared to ABUS (88%) and combined approach (86%). Sensitivities for DBT and ABUS were the same (84%), with DBT + ABUS showing a higher rate (94%). DBT outperformed ABUS in specificity (95% vs. 88%). DBT + ABUS exhibited a higher recall rate (14.89%) compared to ABUS (12.38%) and DBT (6.03%) (p < .001). Standalone ABUS detected more invasive cancers compared to DBT, with a higher recall rate. The combined approach showed a higher CDR by detecting one additional cancer per thousand.

5.
Future Med Chem ; 16(12): 1205-1218, 2024.
Article de Anglais | MEDLINE | ID: mdl-38989986

RÉSUMÉ

Aim: The purpose of this study is to design and synthesize a new series of sulfamethazine derivatives as potent neuraminidase inhibitors. Materials & methods: A sulfamethazine lead compound, ZINC670537, was first identified by structure-based virtual screening technique, then some novel inhibitors X1-X10 based on ZINC670537 were designed and synthesized. Results: Compound X3 exerts the most good potency in inhibiting the wild-type H5N1 NA (IC50 = 6.74 µM) and the H274Y mutant NA (IC50 = 21.09 µM). 150-cavity occupation is very important in determining activities of these inhibitors. The sulfamethazine moiety also plays an important role. Conclusion: Compound X3 maybe regard as a good anti-influenza candidate to preform further study.


[Box: see text].


Sujet(s)
Antiviraux , Conception de médicament , Antienzymes , Sous-type H5N1 du virus de la grippe A , Sialidase , Sulfadimidine , Sialidase/antagonistes et inhibiteurs , Sialidase/métabolisme , Sulfadimidine/pharmacologie , Sulfadimidine/synthèse chimique , Sulfadimidine/composition chimique , Antienzymes/pharmacologie , Antienzymes/synthèse chimique , Antienzymes/composition chimique , Antiviraux/pharmacologie , Antiviraux/synthèse chimique , Antiviraux/composition chimique , Sous-type H5N1 du virus de la grippe A/effets des médicaments et des substances chimiques , Sous-type H5N1 du virus de la grippe A/enzymologie , Relation structure-activité , Humains , Structure moléculaire , Simulation de docking moléculaire
6.
Can J Diet Pract Res ; : 1-4, 2024 Jul 10.
Article de Anglais | MEDLINE | ID: mdl-38985950

RÉSUMÉ

Individuals receiving hemodialysis are at increased risk of malnutrition; however, regular diagnosis of malnutrition using subjective global assessment (SGA) is time-consuming. This study aimed to determine whether the Canadian Nutrition Screening Tool (CNST) or the Geriatric Nutrition Risk Index (GNRI) screening tools could accurately identify hemodialysis patients at risk for malnutrition. A retrospective medical chart review was conducted for in-centre day shift hemodialysis patients (n = 95) to obtain the results of the SGA assessment and the CNST screener and to calculate the GNRI score. Sensitivity and specificity analyses showed only a fair agreement between the SGA and CNST (sensitivity = 20%; specificity 96%; κ = .210 (95% CI, -0.015 to .435), p < .05) and between the SGA and GNRI (sensitivity = 35%; specificity = 88%; κ = .248 (95% CI, .017 to .479), p < .05). There was no significant statistical difference between the accuracy of either tool in identifying patients at risk of malnutrition (p = .50). The CNST and GNRI do not accurately screen for risk of malnutrition in the hemodialysis population; therefore, further studies are needed to determine an effective malnutrition screening tool in this population.

7.
Article de Anglais | MEDLINE | ID: mdl-38966500

RÉSUMÉ

The objective of this article is to highlight the clinical features, screening, diagnosis, treatment, and prevention of gastric cancer (GC). Early GC is often asymptomatic leading to frequent delays in diagnosis. Weight loss and persistent abdominal pain are the most common symptoms at initial diagnosis. The diagnosis of GC typically involves a combination of endoscopy, biopsy, and imaging studies. Endoscopic resection techniques are emerging as successful treatment options for early GC. Treatment options for advanced GC include surgery and chemotherapy. The first line chemotherapy for advanced GC consists of doublet therapy with a combination of platinum and fluoropyrimidines. Trastuzumab, a monoclonal antibody, is used in the treatment of human epidermal growth factor 2 positive GCs. Antiangiogenic agents and immunotherapy are also useful in the treatment of GC. Currently there are no GC screening guidelines in the United States, but they exist in other regions where there is increased prevalence of GC. Prevention strategies for GC include Helicobacter pylori eradication and adoption of a healthy diet consisting of fruits and vegetables.

8.
Front Neurosci ; 18: 1424025, 2024.
Article de Anglais | MEDLINE | ID: mdl-38966756

RÉSUMÉ

In the dynamic landscape of biomedical science, the pursuit of effective treatments for motor neuron disorders like hereditary spastic paraplegia (HSP), amyotrophic lateral sclerosis (ALS), and spinal muscular atrophy (SMA) remains a key priority. Central to this endeavor is the development of robust animal models, with the zebrafish emerging as a prime candidate. Exhibiting embryonic transparency, a swift life cycle, and significant genetic and neuroanatomical congruencies with humans, zebrafish offer substantial potential for research. Despite the difference in locomotion-zebrafish undulate while humans use limbs, the zebrafish presents relevant phenotypic parallels to human motor control disorders, providing valuable insights into neurodegenerative diseases. This review explores the zebrafish's inherent traits and how they facilitate profound insights into the complex behavioral and cellular phenotypes associated with these disorders. Furthermore, we examine recent advancements in high-throughput drug screening using the zebrafish model, a promising avenue for identifying therapeutically potent compounds.

9.
Curr Protoc ; 4(7): e1038, 2024 Jul.
Article de Anglais | MEDLINE | ID: mdl-38967962

RÉSUMÉ

A variety of metals, e.g., lead (Pb), cadmium (Cd), and lithium (Li), are in the environment and are toxic to humans. Hematopoietic stem cells (HSCs) reside at the apex of hematopoiesis and are capable of generating all kinds of blood cells and self-renew to maintain the HSC pool. HSCs are sensitive to environmental stimuli. Metals may influence the function of HSCs by directly acting on HSCs or indirectly by affecting the surrounding microenvironment for HSCs in the bone marrow (BM) or niche, including cellular and extracellular components. Investigating the impact of direct and/or indirect actions of metals on HSCs contributes to the understanding of immunological and hematopoietic toxicology of metals. Treatment of HSCs with metals ex vivo, and the ensuing HSC transplantation assays, are useful for evaluating the impacts of the direct actions of metals on the function of HSCs. Investigating the mechanisms involved, given the rarity of HSCs, methods that require large numbers of cells are not suitable for signal screening; however, flow cytometry is a useful tool for signal screening HSCs. After targeting signaling pathways, interventions ex vivo and HSCs transplantation are required to confirm the roles of the signaling pathways in regulating the function of HSCs exposed to metals. Here, we describe protocols to evaluate the mechanisms of direct and indirect action of metals on HSCs. © 2024 Wiley Periodicals LLC. Basic Protocol 1: Identify the impact of a metal on the competence of HSCs Basic Protocol 2: Identify the impact of a metal on the lineage bias of HSC differentiation Basic Protocol 3: Screen the potential signaling molecules in HSCs during metal exposure Alternate Protocol 1: Ex vivo treatment with a metal on purified HSCs Alternate Protocol 2: Ex vivo intervention of the signaling pathway regulating the function of HSCs during metal exposure.


Sujet(s)
Cellules souches hématopoïétiques , Cellules souches hématopoïétiques/effets des médicaments et des substances chimiques , Cellules souches hématopoïétiques/métabolisme , Cellules souches hématopoïétiques/cytologie , Animaux , Métaux/toxicité , Souris , Humains , Transplantation de cellules souches hématopoïétiques , Cytométrie en flux/méthodes
10.
J Urol ; : 101097JU0000000000004138, 2024 Jul 05.
Article de Anglais | MEDLINE | ID: mdl-38968170

RÉSUMÉ

PURPOSE: To quantify the ability of various PSA values in predicting the likelihood of developing metastatic or fatal prostate cancer in older men. MATERIALS/METHODS: We used a random sample of patients in the United States Veterans Health Administration to identify 80,706 men who had received PSA testing between ages 70 to 75. Our primary endpoint was time to development of either metastatic prostate cancer or death from prostate cancer. We used cumulative/dynamic modeling to account for competing events (death from non-prostate cancer causes) in studying both the discriminative ability of PSA as well as for positive predictive value and negative predictive value at three time points. RESULTS: PSA demonstrated time-dependent predictive discrimination, with receiver operating characteristic area under the curve at 5, 10, and 14 years decreasing from 0.83 to 0.77 to 0.73, respectively, but without statistically significant difference when stratified by race. At PSA thresholds between 1 and 8 ng/mL, the positive predictive value of developing advanced prostate cancer was significantly greater in Black than White patients. For instance, at a PSA > 3, at 5, 10, and 14 years, White patients had 2.4%, 2.9%, and 3.7% risk of an event, whereas Black patients had 4.3%, 6.5%, and 8.3% risk. CONCLUSIONS: In men aged 70 to 75 deciding whether to cease PSA testing with borderline-elevated PSA values, the risk of developing metastatic or fatal prostate cancer is quantifiable and relatively low. Risk assessment in this setting must account for the higher incidence of prostate cancer in Black men.

11.
Article de Anglais | MEDLINE | ID: mdl-38968392

RÉSUMÉ

Objective: Routine health care visits offer the opportunity to screen older adults for symptoms of Alzheimer's disease (AD). Many women see their gynecologist as their primary health care provider. Given this unique relationship, the Women's Preventive Services Initiative and the American College of Obstetrics and Gynecology advocate for integrated care of women at all ages. It is well-established that women are at increased risk for AD, and memory screening of older women should be paramount in this effort. Research is needed to determine the feasibility and value of memory screening among older women at the well-woman visit. Materials and Methods: Women aged 60 and above completed a 5-item subjective memory screener at their well-woman visit at the Columbia University Integrated Women's Health Program. Women who endorsed any item were considered to have a positive screen and were given the option to pursue clinical evaluation. Rates of positive screens, item endorsement, and referral preferences were examined. Results: Of the 530 women approached, 521 agreed to complete the screener. Of those, 17.5% (n = 91) were classified as positive. The most frequently endorsed item was difficulty with memory or thinking compared with others the same age. Among women with positive screens, 57.5% were interested in pursuing clinical referrals to a memory specialist. Conclusion: Results support the feasibility and potential value of including subjective memory screening as part of a comprehensive well-woman program. Early identification of memory loss will enable investigation into the cause of memory symptoms and longitudinal monitoring of cognitive change.

12.
Comput Biol Chem ; 112: 108133, 2024 Jun 25.
Article de Anglais | MEDLINE | ID: mdl-38968780

RÉSUMÉ

Nipah virus (NiV) remains a significant global concern due to its impact on both the agricultural industry and human health, resulting in substantial economic and health consequences. Currently, there is no cure or commercially available vaccine for the virus. Therefore, it is crucial to prioritize the discovery of new and effective treatment options to prevent its continued spread. Streptomyces spp. are rich sources of metabolites known for their bioactivity against certain diseases; however, their potential as antiviral drugs against the Nipah virus remain unexplored. In this study, 6524 Streptomyces spp. metabolites were screened through in silico methods for their inhibitory effects against the Nipah virus matrix (NiV-M) protein, which assists in virion assembly of Nipah virus. Different computer-aided tools were utilized to carry out the virtual screening process: ADMET profiling revealed 913 compounds with excellent safety and efficacy profiles, molecular docking predicted the binding poses and associated docking scores of the ligands in their respective targets, MD simulations confirmed the binding stability of the top ten highest-scoring ligands in a 100 ns all-atom simulation, PCA elucidated simulation convergence, and MMPB(GB)SA calculations estimated the binding energies of the final candidate compounds and determined the key residues crucial for complex formation. Using in silico methods, we identified six metabolites targeting the main substrate-binding site and five targeting the dimerization site that exhibited excellent stability and strong binding affinity. We recommend testing these compounds in the next stages of drug development to confirm their effectiveness as therapeutic agents against Nipah virus.

13.
Early Hum Dev ; 195: 106068, 2024 Jun 24.
Article de Anglais | MEDLINE | ID: mdl-38968818

RÉSUMÉ

BACKGROUND: Very preterm infants are at increased risk of neurodevelopmental impairments. The Neonatal Visual Assessment (NVA) assesses visual function and outcomes and has been used to assess early neurodevelopmental outcomes. This study aimed to compare NVA results of very preterm and term-born infants and to calculate the sensitivity and specificity of the NVA at term equivalent age (TEA) and three months corrected age (CA) to predict motor and cognitive outcomes at 12 months CA in very preterm infants. METHODS: This prospective observational cohort study recruited infants born before 31 weeks gestation and a healthy term-born control group. The NVA was assessed at TEA and three months CA, and neurodevelopmental outcomes (Bayley Scales of Infant and Toddler Development, Third Edition; Neurosensory Motor Developmental Assessment; Alberta Infant Motor Scale) were performed at 12 months CA. The sensitivity and specificity of the NVA to predict outcomes were calculated based on a previously published optimality score. RESULTS: 248 preterm (54 % male) and 46 term-born infants (48 % male) were analysed. The mean NVA scores of preterm and term-born infants were significantly different at TEA (preterm 3.1±2.1; term-born 1.2±1.7, p < 0.001). The NVA had moderate sensitivity (59-78 %) and low specificity (25-27 %) at TEA, and low sensitivity (21-28 %) and high specificity (86-87 %) at three months CA for the prediction of preterm infants' outcomes at 12 months CA. CONCLUSION: The NVA at TEA and three months CA was not a strong predictor of motor and cognitive impairments in this contemporary cohort of very preterm infants.

14.
Sci Total Environ ; : 174486, 2024 Jul 03.
Article de Anglais | MEDLINE | ID: mdl-38969135

RÉSUMÉ

Efforts to regulate and monitor emerging contaminants are insufficient because new chemicals are continually brought to market, and many are unregulated and potentially harmful. Domestic wastewater treatment plants are not designed to remove micropollutants and are important sources of emerging contaminants in the aquatic environment. In this study, non-target screening, an unbiased method for analyzing compounds without prior information, was used to identify compounds that may be emitted in wastewater treatment plant effluent and should be monitored. Nine wastewater treatment plants using different treatment methods were studied, and a non-target screening data-processing method was used. The frequencies at which the contaminants were detected and contaminant persistence through the treatment processes were considered, and then the contaminants were prioritized. The predicted no-effect concentration of each prioritized contaminant was used to determine whether further analysis and monitoring of the contaminant was necessary. Quantitative analyses of five compounds (amantadine, atenolol, benzotriazole, diphenhydramine, and sulpiride) were performed using reference standards. Probable molecular formulae and structures were proposed for 17 contaminants, and the risks posed by the contaminants were estimated using predicted no-effect concentrations. The results provide valuable insights into how unregulated micropollutants can be identified and prioritized for monitoring in future studies.

15.
J Am Coll Radiol ; 2024 Jul 03.
Article de Anglais | MEDLINE | ID: mdl-38969253

RÉSUMÉ

OBJECTIVE: Mammography and MRI screening typically occur in combination or in alternating sequence. We compared multimodality screening performance accounting for the relative timing of mammography and MRI and overlapping follow-up periods. METHODS: We identified 8,260 screening mammograms performed 2005-2017 in the Breast Cancer Surveillance Consortium, paired with screening MRIs within +/- 90 days (combined screening) or 91-270 days (alternating screening). Performance for combined screening [cancer detection rate (CDR) per 1000 examinations and sensitivity] was calculated with one-year follow-up for each modality, and with a single follow-up period treating the two tests as a single test. Alternating screening performance was calculated with one-year follow-up for each modality and also with follow-up ending at the next screen if within one year (truncated follow-up). RESULTS: For 3,810 combined screening pairs, CDR per 1000 screens was 6.8 (95%CI: 4.6-10.0) for mammography and 12.3 (95%CI: 9.3-16.4) for MRI as separate tests compared to 13.1 (95%CI: 10.0-17.3) as a single combined test. Sensitivity of each test was 48.1% (35.0%-61.5%) for mammography and 79.7% (95%CI: 67.7-88.0%) for MRI compared to 96.2% (95%CI: 85.9-99.0%) for combined screening. For 4,450 alternating screening pairs, mammography CDR per 1000 screens changed from 3.6 (95%CI: 2.2-5.9) to zero with truncated follow-up; sensitivity was incalculable (denominator=0). MRI CDR per 1000 screens changed from 12.1 (95%CI 9.3-15.8) to 11.7 (95%CI: 8.9-15.3) with truncated follow-up; sensitivity changed from 75.0% (95%CI 63.8-83.6%) to 86.7% (95%CI 75.5-93.2%). DISCUSSION: Updating auditing approaches to account for combined and alternating screening sequencing and to address outcome attribution issues arising from overlapping follow-up periods can improve the accuracy of multimodality screening performance evaluation.

16.
BMJ Case Rep ; 17(7)2024 Jul 05.
Article de Anglais | MEDLINE | ID: mdl-38969390

RÉSUMÉ

In this case report, we present a man in his 60s who presented with an incidentally discovered right adrenal mass, which turned out to be an adrenal schwannoma. This is a very rare tumour that originates from Schwann cells and involves the peripheral nerves. The tumour was removed by open adrenalectomy, and this 15-cm adrenal schwannoma is one of the largest reported in the literature, with none >16 cm having ever been reported. This case highlights the importance of keeping an open mind about the cause of an incidentally discovered adrenal mass, which is an increasingly common way for adrenal tumours to present given the increased access to cross-sectional imaging. As well as presenting the case and the pathological basis behind adrenal schwannomas, we include a review of the literature and a general discussion about incidentally discovered adrenal masses.


Sujet(s)
Tumeurs de la surrénale , Surrénalectomie , Neurinome , Humains , Neurinome/chirurgie , Neurinome/imagerie diagnostique , Neurinome/anatomopathologie , Mâle , Tumeurs de la surrénale/chirurgie , Tumeurs de la surrénale/anatomopathologie , Tumeurs de la surrénale/imagerie diagnostique , Tumeurs de la surrénale/diagnostic , Surrénalectomie/méthodes , Adulte d'âge moyen , Résultats fortuits , Tomodensitométrie
17.
BMJ Case Rep ; 17(7)2024 Jul 05.
Article de Anglais | MEDLINE | ID: mdl-38969392

RÉSUMÉ

Sotos syndrome is a disorder characterised by distinctive facial features, excessive growth during childhood and intellectual disability. While these criteria apply to children and adults, they fall short when applied to neonates. Hyperbilirubinaemia, large for gestational age, hypotonia and seizures, along with cardiac and renal anomalies, are known to be common presentations in neonates. Reports have also added hyperinsulinaemic hypoglycaemia as a presenting feature of Sotos syndrome in neonates. Here, we report a case of Sotos syndrome in a neonate who presented in the neonatal period with recurrent apnoeic episodes with hypotonia, which were later attributed to severe gastro-oesophageal reflux.


Sujet(s)
Reflux gastro-oesophagien , Syndrome de Sotos , Humains , Reflux gastro-oesophagien/diagnostic , Reflux gastro-oesophagien/complications , Nouveau-né , Syndrome de Sotos/diagnostic , Syndrome de Sotos/complications , Mâle , Femelle , Hypotonie musculaire/étiologie , Hypotonie musculaire/diagnostic
18.
Anal Chim Acta ; 1316: 342818, 2024 Aug 08.
Article de Anglais | MEDLINE | ID: mdl-38969402

RÉSUMÉ

Interdigitated electrodes (IDEs) enable electrochemical signal enhancement through repeated reduction and oxidation of the analyte molecule. Porosity on these electrodes is often used to lower the impedance background. However, their high capacitive current and signal interferences with oxygen reduction limit electrochemical detection ability. We present utilization of alkanethiol modification on nanoporous gold (NPG) electrodes to lower their background capacitance and chemically passivate them from interferences due to oxygen reduction, while maintaining their fast electron transfer rates, as validated by lower separation between anodic and cathodic peaks (ΔE) and lower charge transfer resistance (Rct) values in comparison to planar gold electrodes. Redox amplification based on this modification enables sensitive detection of various small molecules, including pyocyanin, p-aminophenol, and selective detection of dopamine in the presence of ascorbic acid. Alkanethiol NPG arrays are applied as a multiplexed sensor testbed within a well plate to screen binding of various peptide receptors to the SARS COV2 S-protein by using a sandwich assay for conversion of PAPP (4-aminophenyl phosphate) to PAP (p-aminophenol), by the action of AP (alkaline phosphatase), which is validated against optical ELISA screens of the peptides. Such arrays are especially of interest in small volume analytical settings with complex samples, wherein optical methods are unsuitable.


Sujet(s)
Aminophénols , Techniques électrochimiques , Or , Microélectrodes , Nanopores , Oxydoréduction , Or/composition chimique , Techniques électrochimiques/instrumentation , Aminophénols/composition chimique , Thiols/composition chimique , Dopamine/analyse , Dopamine/composition chimique , Techniques de biocapteur , Limite de détection , SARS-CoV-2/isolement et purification , Humains
19.
Anal Chim Acta ; 1316: 342836, 2024 Aug 08.
Article de Anglais | MEDLINE | ID: mdl-38969426

RÉSUMÉ

BACKGROUND: As promising biomarkers of diabetes, α-glucosidase (α-Glu) and ß-glucosidase (ß-Glu) play a crucial role in the diagnosis and management of diseases. However, there is a scarcity of techniques available for simultaneously and sensitively detecting both enzymes. What's more, most of the approaches for detecting α-Glu and ß-Glu rely on a single-mode readout, which can be affected by multiple factors leading to inaccurate results. Hence, the simultaneous detection of the activity levels of both enzymes in a single sample utilizing multiple-readout sensing approaches is highly attractive. RESULTS: In this work, we constructed a facile sensing platform for the simultaneous determination of α-Glu and ß-Glu by utilizing a luminescent covalent organic framework (COF) as a fluorescent indicator. The enzymatic hydrolysis product common to both enzymes, p-nitrophenol (PNP), was found to affect the fluorometric signal through an inner filter effect on COF, enhance the colorimetric response by intensifying the absorption peak at 400 nm, and induce changes in RGB values when analyzed using a smartphone-based color recognition application. By combining fluorometric/colorimetric measurements with smartphone-assisted RGB mode, we achieved sensitive and accurate quantification of α-Glu and ß-Glu. The limits of detection for α-Glu were determined to be 0.8, 1.22, and 1.85 U/L, respectively. Similarly, the limits of detection for ß-Glu were 0.16, 0.42, and 0.53 U/L, respectively. SIGNIFICANCE: Application of the proposed sensing platform to clinical serum samples revealed significant differences in the two enzymes between healthy people and diabetic patients. Additionally, the proposed sensing method was successfully applied for the screening of α-Glu inhibitors and ß-Glu inhibitors, demonstrating its viability and prospective applications in the clinical management of diabetes as well as the discovery of antidiabetic medications.


Sujet(s)
Inhibiteurs des glycoside hydrolases , Réseaux organométalliques , alpha-Glucosidase , bêta-Glucosidase , Réseaux organométalliques/composition chimique , Humains , Inhibiteurs des glycoside hydrolases/pharmacologie , Inhibiteurs des glycoside hydrolases/composition chimique , bêta-Glucosidase/antagonistes et inhibiteurs , bêta-Glucosidase/métabolisme , alpha-Glucosidase/métabolisme , alpha-Glucosidase/sang , Colorimétrie/méthodes , Limite de détection , Nitrophénols/métabolisme , Nitrophénols/composition chimique , Nitrophénols/analyse , Évaluation préclinique de médicament , Colorants fluorescents/composition chimique
20.
Int J Methods Psychiatr Res ; 33(3): e2030, 2024 Sep.
Article de Anglais | MEDLINE | ID: mdl-38956889

RÉSUMÉ

OBJECTIVES: The Mental Health Inventory (MHI-5) is frequently used as a screener for mood and anxiety disorders. However, few population-based studies have validated it against a diagnostic instrument assessing disorders following current diagnostic criteria. METHODS: Within the third Netherlands Mental Health Survey and Incidence Study (NEMESIS-3), a representative population-based study of adults (N = 6194; age: 18-75 years), the MHI-5 was used to measure general mental ill-health in the past month. Presence of mood (major depressive disorder, persistent depressive disorder, or bipolar disorder) and anxiety disorders (panic disorder, agoraphobia, social phobia, or generalized anxiety disorder) in the past month was assessed with a slightly modified version of the Composite International Diagnostic Interview 3.0 per the Diagnostic and Statistical Manual of Mental disorders-5. RESULTS: The MHI-5 was good to excellent at distinguishing people with and without a mood disorder, an anxiety disorder, and any mood or anxiety disorder. The cut-off value associated with the highest sensitivity and highest specificity for mood disorder was ≤68, and ≤76 for an anxiety disorder or any mood or anxiety disorder. CONCLUSIONS: The MHI-5 can identify individuals at high risk of a current mood or anxiety disorder in the general population when diagnostic interviews are too time consuming.


Sujet(s)
Troubles anxieux , Troubles de l'humeur , Échelles d'évaluation en psychiatrie , Humains , Adulte , Adulte d'âge moyen , Femelle , Troubles anxieux/diagnostic , Troubles anxieux/épidémiologie , Mâle , Adolescent , Jeune adulte , Sujet âgé , Troubles de l'humeur/diagnostic , Troubles de l'humeur/épidémiologie , Pays-Bas/épidémiologie , Échelles d'évaluation en psychiatrie/normes , Reproductibilité des résultats , Sensibilité et spécificité
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