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1.
Front Physiol ; 15: 1393221, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39345785

RESUMEN

Introduction: Frailty often manifests as an increased vulnerability to adverse outcomes, and detecting frailty is useful for informed healthcare decisions. Veterans are at higher risk for developing frailty and at younger ages. The goal of this study was to investigate approaches in Veterans that can better inform the physiologic underpinnings of frailty, including maximal oxygen uptake (VO2max), 6-min walk, muscle strength, and inflammatory biomarkers. Methods: Participants (N = 42) were recruited from the Buffalo VA Medical Center. Inclusion criteria: ages 60-85, male or female, any race, and not having significant comorbidities or cognitive impairment. Outcome measures included: the Fried frailty phenotype, the short physical performance battery (SPPB), quality of life (QOL) using the Q-LES-Q-SF, and the following physiologic assessments: VO2max assessment on an upright stationary bicycle, 6-min walk, and arm and leg strength. Additionally, inflammatory biomarkers (C-reactive protein, IL-6, IL-10, interferon-γ, and TNF-α) were measured using ELLA single and multiplex ELISA. Results: Participants: 70.3 ± 7.4 years of age: 34 males and 8 females, BMI = 30.7 ± 5.4 kg/m2, 26 white and 16 African American. A total of 18 (42.8%) were non-frail, 20 (47.6%) were pre-frail, and 4 (9.5%) were frail. VO2max negatively correlated with Fried frailty scores (r = -0.40, p = 0.03, N = 30), and positively correlated with SPPB scores (r = 0.50, p = 0.005), and QOL (r = 0.40, p = 0.03). The 6-min walk test also significantly correlated with VO2max (r = 0.57, p = 0.001, N = 42) and SPPB (r = 0.55, p = 0.0006), but did not quite reach a significant association with frailty (r = -0.28, p = 0.07). Arm strength negatively correlated with frailty (r = -0.47, p = 0.02, N = 26), but not other parameters. Inflammatory profiles did not differ between non-frail and pre-frail/frail participants. Conclusion: Objectively measured cardiorespiratory fitness was associated with important functional outcomes including physical performance, QOL, and frailty in this group of older Veterans. Furthermore, the 6-min walk test correlated with VO2max and SPPB, but more validation is necessary to confirm sensitivity for frailty. Arm strength may also be an important indicator of frailty, however the relationship to other indicators of physical performance is unclear.

2.
Sci Rep ; 14(1): 19678, 2024 08 24.
Artículo en Inglés | MEDLINE | ID: mdl-39181891

RESUMEN

The formulation and delivery of macromolecules through the oral route pose considerable challenges due to factors such as large molecular weight, pH sensitivity, and limited formulation approaches. This challenge is compounded if the drug is poorly permeable, necessitating innovative drug delivery strategies. Vancomycin, a widely prescribed glycopeptide antibiotic, has an oral bioavailability of less than 10%, leading to predominantly intravenous administration and potential patient discomfort. This study explores the potential of the buccal route as a non-invasive, highly vascularised alternative route of administration, offering a rapid onset of action while bypassing the first-pass metabolism. In this study, vancomycin was coated with L-glutamic acid using an isothermal dry particle coater to modulate permeation through the buccal cell line, TR146. Results confirm significant impact of both amino acid concentration and dry particle coating on the rate and extent of drug permeability. With the introduction of L-glutamic acid and utilisation of the isothermal dry particle coater, vancomycin's permeation profile increased six-fold compared to the control due to the formation of drug ion-pair complex. Imaging studies showed the presence of layered micronized glutamic acid particles on the surface of dry coated vancomycin particles which confirms the role of dry coating and amino acid concentration in modulating drug permeation. Microbiology experiments in Staphylococcus aureus, minimum inhibitory concentration and biofilm disruption studies, provided confirmatory evidence of antimicrobial activity of dry coated glutamic acid-vancomycin ion pair particulate structure. This study demonstrates, for the first-time, buccal delivery of dry coated large molecule drug, vancomycin, through controlled deposition of amino acid using innovative particle coating strategy.


Asunto(s)
Antibacterianos , Vancomicina , Vancomicina/administración & dosificación , Vancomicina/farmacocinética , Humanos , Antibacterianos/administración & dosificación , Antibacterianos/farmacología , Antibacterianos/farmacocinética , Aminoácidos/química , Aminoácidos/metabolismo , Staphylococcus aureus/efectos de los fármacos , Mucosa Bucal/metabolismo , Permeabilidad/efectos de los fármacos , Sistemas de Liberación de Medicamentos/métodos , Línea Celular , Ácido Glutámico/metabolismo
5.
Pathogens ; 12(6)2023 Jun 20.
Artículo en Inglés | MEDLINE | ID: mdl-37375543

RESUMEN

Plectranthus amboinicus (Indian borage) has been extensively studied for its medicinal properties, which can be exploited to develop new antimicrobial therapeutics. The current study investigated the effect of Plectranthus amboinicus leaf extracts on the catalase activity, reactive oxygen species, lipid peroxidation, cytoplasmic membrane permeability, and efflux pump activity in S. aureus NCTC8325 and P. aeruginosa PA01. As the enzyme catalase protects bacteria against oxidative stress, disruption of its activity creates an imbalance in reactive oxygen species (ROS) levels, which subsequently oxidizes lipid chains, leading to lipid peroxidation. In addition, bacterial cell membranes are a potential target for new antibacterial agents, as efflux pump systems play a crucial role in antimicrobial resistance. Upon exposure of the microorganisms to Indian borage leaf extracts, the observed catalase activity decreased by 60% and 20% in P. aeruginosa and S. aureus, respectively. The generation of ROS can cause oxidation reactions to occur within the polyunsaturated fatty acids of the lipid membranes and induce lipid peroxidation. To investigate these phenomena, the increase in ROS activity in P. aeruginosa and S. aureus was studied using H2DCFDA, which is oxidized to 2',7'-dichlorofluorescein (DCF) by ROS. Furthermore, the concentration of lipid peroxidation product (malondialdehyde) was assessed using the Thiobarbituric acid assay and was shown to increase by 42.4% and 42.5% in P. aeruginosa and S. aureus, respectively. The effect of the extracts on the cell membrane permeability was monitored using diSC3-5 dye and it was observed that the cell membrane permeability of P. aeruginosa increased by 58% and of S. aureus by 83%. The effect on efflux pump activity was investigated using Rhodamine-6-uptake assay, which displayed a decrease in efflux activity of 25.5% in P. aeruginosa and 24.2% in S. aureus after treatment with the extracts. This combination of different methods to study various bacterial virulence factors provides a more robust, mechanistic understanding of the effect of P. amboinicus extracts on P. aeruginosa and S. aureus. This study thus represents the first report of the assessment of the effect of Indian borage leaf extracts on bacterial antioxidant systems and bacterial cell membranes, and can facilitate the future development of bacterial resistance modifying agents derived from P. amboinicus.

6.
SAGE Open Med ; 11: 20503121231208604, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-39139578

RESUMEN

Objective: In Bangladesh, the factors that contribute to the reduced quality of life were not systematically investigated in long-term stroke survivors, and only a few studies have used preference-based measures to assess the quality of life. We sought to assess the quality of life in stroke survivors who comprise physical health status, psychological state, social relationship, and surrounding environment of the stroke patients. Methods: The quality of life among stroke patients was assessed with a semi-structured questionnaire using the validated Bangla Version of the World Health Organization, Quality-of-Life scale among the patients who survived beyond 28 days of first-ever stroke occurrence presenting in the Department of Physical Medicine and Rehabilitation, Bangabandhu Sheikh Mujib Medical University in the period between November 2020 and October 2021. Results: Of the 77 patients who were identified as post-stroke patients, the mean score of overall quality of life (as assessed by Q1 and scored in a range of 1-5) was 3.14 ± 1.08. The mean scores of quality of life were highest for the psychological domain (51.18 ± 19.73) followed by environmental (52.08 ± 13.13), social (45.62 ± 22.73), and physical domains (37.18 ± 18.56). According to the classification of the Bangla Version of the World Health Organization, Quality-of-Life, 75.3% had a low physical quality of life, 37.7% had a low psychological quality of life, 53.2% had a low social quality of life, and 53.2% had a moderate environmental quality of life. The average scores for the physical, psychological, social, and environmental domains were notably lower in stroke survivors with comorbid chronic conditions such as hypertension, diabetes, heart disease, asthma or chronic obstructive pulmonary disease, obesity, and ischemic heart disease in comparison to those without such conditions. Conclusion: In our study, post-stroke patients with lower quality of life were associated with factors such as female gender, lower level of education, urban dwellers, and chronic diseases.

7.
Curr Microbiol ; 80(1): 24, 2022 Dec 03.
Artículo en Inglés | MEDLINE | ID: mdl-36462098

RESUMEN

Plectranthus amboinicus is widely recognized as a potential source of antimicrobial compounds due to the presence of bioactive components (essential oils) secreted by the glandular trichomes borne on the leaves. As such, an understanding of the effect of leaf development on the production of these essential oils (EOs) is of crucial importance to its medicinal applications. The current study represents the first comparative investigation of the effect of different stages of leaf development (lag, log, and stationary phase) upon the yield and bioactivity of phytochemicals produced. The effects of leaf extracts on the antimicrobial activity, cell surface hydrophobicity, biofilm formation, and motility of P. aeruginosa and Staphylococcus aureus were evaluated. Cryo-scanning electron microscopy was used to record the abundance and distribution of both glandular and non-glandular trichomes during leaf development. Gas chromatography-mass spectrometry analysis revealed that the potent phytochemical thymol is present primarily in log (30.28%) and stationary phase (20.89%) extracts. Log phase extracts showed the lowest minimum inhibitory concentration (25 mg/ml) when compared to other phases of development. Stationary phase extracts were shown to exhibit the highest biofilm dispersal activity against P. aeruginosa (80%), and log phase extracts against biofilms of S. aureus (59%). Log phase extracts showed the highest biofilm inhibitory activity against P. aeruginosa (66%) and S. aureus (63%). In conclusion, log phase leaf extracts of P. amboinicus exhibited a multimodal mechanism of action by displaying antimicrobial, antibiofilm activities and reducing the motility and hydrophobicity, which are important virulence factors in P. aeruginosa and S. aureus pathogenesis.


Asunto(s)
Aceites Volátiles , Plectranthus , Infecciones Estafilocócicas , Staphylococcus aureus , Pseudomonas aeruginosa , Factores de Virulencia , Aceites Volátiles/farmacología
8.
Life (Basel) ; 12(8)2022 Jul 28.
Artículo en Inglés | MEDLINE | ID: mdl-36013325

RESUMEN

Diabetes Mellitus (DM) is a metabolic disorder that is spreading alarmingly around the globe. Type-2 DM (T2DM) is characterized by low-grade inflammation and insulin resistance and is closely linked to obesity. T2DM is mainly controlled by lifestyle/dietary changes and oral antidiabetic drugs but requires insulin in severe cases. Many of the drugs that are currently used to treat DM are costly and present adverse side effects. Several cellular, animal, and clinical studies have provided compelling evidence that flavonoids have therapeutic potential in the management of diabetes and its complications. Quercetin is a flavonoid, present in various natural sources, which has demonstrated in vitro and in vivo antidiabetic properties. It improves oral glucose tolerance, as well as pancreatic ß-cell function to secrete insulin. It inhibits the α-glucosidase and DPP-IV enzymes, which prolong the half-life of glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP). Quercetin also suppresses the release of pro-inflammatory markers such as IL-1ß, IL-4, IL-6, and TNF-α. Further studies are warranted to elucidate the mode(s) of action of quercetin at the molecular level. This review demonstrates the therapeutic potential of quercetin in the management of T2DM.

9.
PLOS Glob Public Health ; 2(9): e0000930, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36962636

RESUMEN

Rohingya refugees of Ukhiya, Cox's bazar are an unaccounted group of people who form the largest cluster of refugees worldwide. Non-communicable disease (NCD) alone causes 70% of worldwide deaths every year therefore, the trend of NCD among Rohingya refugees demands proper evaluation and attention. The objective of this study was to measure the NCD risk factors among a convenient sample of Rohingya refugees. This cross-sectional study was conducted among 249 Rohingya refugees living in Balukhali and Kutupalang Rohinga Camps at Ukhiya, Cox's bazaar using a survey dataset adapted from the WHO Stepwise approach to NCD Risk Factor Surveillance (STEPS). Data was collected through face-to-face interviews with a structured questionnaire. Anthropometric and biochemical measurements were done by trained medical assistants. Descriptive analysis was applied as appropriate for categorical variables. A Chi-square test and a student t test were performed to compare the categories. In general, the findings of NCD risk factors as per STEPS survey was 53.4% for tobacco use including smokeless tobacco, 2.8% for alcohol consumption, 23.7% for inadequate vegetable and fruit intake, 34.5% for taking extra salt, 89.6% for insufficient physical activity, 44.5%for confirmed hypertension, 16.9% for overweight, 1.2% for obesity and 0.8% for high blood sugar. Some modifiable non-communicable disease risk factors such as physical inactivity, tobacco smoking, extra salt with food, and hypertension are present among the Rohinga refugees in Bangladesh. These findings were timely and essential to support the formulation and implementation of NCD-related policies among the Rohingya refugees as a priority sub-population.

10.
Cancer Rep (Hoboken) ; 5(3): e1484, 2022 03.
Artículo en Inglés | MEDLINE | ID: mdl-34196131

RESUMEN

BACKGROUND: Yes-associated protein 1 (YAP1) is responsible for tumor growth, progression and metastasis. The mechanisms controlling the generation and relative ratio of the functional YAP1 and other co-factors are not well-understood. Various literature reported that co-factors like cytokines significantly influence signaling pathways to introduce epithelial immunity and regeneration, which later helps increase cancer-related phenotypes. Among various cytokines, IL-18 has emerged as a major player in inflammation and progression of different types of cancers. Till now, much information has not been known about the role of YAP1 in tumor aggressiveness and immune evasion in breast cancer with respect to IL-18. AIM: We aimed to explore the effect of YAP1 in tumor aggressiveness and immune evasion in breast invasive carcinoma and metastatic breast cancer in the context of Interleukin-18 (IL-18) in silico. METHODS AND RESULTS: We used publicly available data generated by The Cancer Genome Atlas (TCGA) Research Network through cBioportal web platform. Kaplan-Meier method was used to determine the overall survival and comparison between curves were made using Log-Rank test. The p values were determined by Fisher's exact test with the null hypothesis. Correlation plots were analyzed by comparison with gene copy numbers from the GISTIC2.0, available through cBioportal. Our analyses suggest that IL-18 influences YAP1 expression in breast oncogenesis via Interferon-gamma (IFN-γ) production. Patients having a higher expression of IL-18 possess a better prognosis and higher YAP1 expression with lower IL18 drives to poor clinical results in breast cancer. CONCLUSION: This can provide new approaches to better understand the relation between YAP1 and IL-18 in breast cancer progression by performing in vitro and in vivo studies. Also, IL-18 can be considered as a potential target for tumor treatment in YAP1 overexpressed breast carcinoma.


Asunto(s)
Neoplasias de la Mama , Interleucina-18 , Proteínas Señalizadoras YAP , Mama/patología , Neoplasias de la Mama/patología , Carcinogénesis/genética , Transformación Celular Neoplásica/genética , Femenino , Regulación Neoplásica de la Expresión Génica , Humanos , Interleucina-18/genética , Interleucina-18/metabolismo , Proteínas Señalizadoras YAP/genética
11.
Acta Orthop Belg ; 87(2): 219-225, 2021 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-34529373

RESUMEN

Although distal radius fractures are quite common, bilateral distal radius fractures seldomly occur. Due to this, treatment is primarily based on surgeon experience with unilateral fractures, however bi- lateral fractures add a level of complexity : loss of functional independence. The purpose of this study was to examine a cohort of patients with bilateral distal radius fractures to identify differences in demographics, mechanism of injury, and outcomes to further our understanding of these rare injuries. 23 patients were identified retrospectively over a 5-year period that met inclusion criteria. The medical records were reviewed with multiple demographic and clinical parameters recorded and analyzed. Males were more likely to sustain high-energy mechanisms (80% vs. 53%). Patients <50 years old were more likely to sustain high-energy mechanisms (90% vs. 46%) and were more likely to be treated operatively (80% vs. 62%). The most commonly associated injury was a head injury (30%). All patients treated non-operatively reported minimal/no pain upon final follow-up where 57% of patients treated operatively noted regular pain. 75% of patients with medical comorbidities had minimal/no pain upon final follow- up. Conclusions : Patients with bilateral fractures were more likely to be younger males who suffered from higher energy mechanisms. Age was a critical factor in determining treatment strategy. Rates of associated head injuries were elevated, which is an important factor for the clinician to keep in mind when treating this population. As we further our understanding of this unique population, we can improve our treatment approaches and subsequently attain better outcomes.


Asunto(s)
Fracturas del Radio , Estudios de Cohortes , Demografía , Humanos , Masculino , Persona de Mediana Edad , Fracturas del Radio/epidemiología , Fracturas del Radio/cirugía , Estudios Retrospectivos
12.
Artículo en Inglés | MEDLINE | ID: mdl-34300053

RESUMEN

Staphylococcus aureus is a nosocomial bacterium causing different infectious diseases, ranging from skin and soft tissue infections to more serious and life-threatening infections such as septicaemia. S. aureus forms a complex structure of extracellular polymeric biofilm that provides a fully secured and functional environment for the formation of microcolonies, their sustenance and recolonization of sessile cells after its dispersal. Staphylococcus aureus biofilm protects the cells against hostile conditions, i.e., changes in temperature, limitations or deprivation of nutrients and dehydration, and, more importantly, protects the cells against antibacterial drugs. Drugs are increasingly becoming partially or fully inactive against S. aureus as they are either less penetrable or totally impenetrable due to the presence of biofilms surrounding the bacterial cells. Other factors, such as evasion of innate host immune system, genome plasticity and adaptability through gene evolution and exchange of genetic material, also contribute to the ineffectiveness of antibacterial drugs. This increasing tolerance to antibiotics has contributed to the emergence and rise of antimicrobial resistance (AMR), a serious problem that has resulted in increased morbidity and mortality of human and animal populations globally, in addition to causing huge financial losses to the global economy. The purpose of this review is to highlight different aspects of S. aureus biofilm formation and its overall architecture, individual biofilm constituents, clinical implications and role in pathogenesis and drug resistance. The review also discusses different techniques used in the qualitative and quantitative investigation of S. aureus biofilm and various strategies that can be employed to inhibit and eradicate S. aureus biofilm.


Asunto(s)
Infecciones Estafilocócicas , Staphylococcus aureus , Animales , Antibacterianos/farmacología , Biopelículas , Humanos , Pruebas de Sensibilidad Microbiana , Infecciones Estafilocócicas/tratamiento farmacológico , Staphylococcus aureus/genética
13.
PLoS One ; 16(4): e0250705, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33914790

RESUMEN

Antimicrobial resistance (AMR) is emerging as a global threat to public health. One of the strategies employed to combat AMR is the use of adjuvants which act to enhance or reinstate antimicrobial activity by inhibiting resistance mechanisms. However, these adjuvants are themselves not immune to selecting resistant phenotypes. Thus, there is a need to utilise mechanisms which are either less likely to or unable to trigger resistance. One commonly employed mechanism of resistance by microorganisms is to prevent antimicrobial uptake or efflux the antibiotic which manages to permeate its membrane. Here we propose amino acids as antimicrobial adjuvants that may be utilizing alternate mechanisms to fight AMR. We used a modified ethidium bromide (EtBr) efflux assay to determine its efflux in the presence of ciprofloxacin within Staphylococcus aureus (NCTC 8325) and Pseudomonas aeruginosa (PAO1). In this study, aspartic acid and glutamic acid were found to inhibit growth of both bacterial species. Moreover, a reduced production of toxic pigments, pyocyanin and pyoverdine by P. aeruginosa was also observed. As evident from similar findings with tetracycline, these adjuvants, may be a way forward towards tackling antimicrobial resistance.


Asunto(s)
Aminoácidos Acídicos/farmacología , Ciprofloxacina/farmacología , Pigmentos Biológicos/biosíntesis , Pseudomonas aeruginosa/crecimiento & desarrollo , Pseudomonas aeruginosa/metabolismo , Staphylococcus aureus/crecimiento & desarrollo , Staphylococcus aureus/metabolismo , Pseudomonas aeruginosa/efectos de los fármacos , Staphylococcus aureus/efectos de los fármacos
14.
Pharm Dev Technol ; 26(1): 101-109, 2021 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-33078682

RESUMEN

There is a need to accelerate paediatric formulation evaluation and enhance quality of early stage data in drug development to alleviate the information pinch point present between formulation development and clinical evaluation. This present work reports application of DNA microarrays as a high throughput screening tool identifying markers for prediction of bioavailability and formulation driven physiological responses. With a focus on enhancing paediatric medicine provision, an oral liquid spironolactone suspension was formulated addressing a paediatric target product profile. Caco-2 cells cultured on transwell inserts were implemented in transport assays in vitro and DNA microarrays were used to examine gene expression modulation. Wistar rats were used to derive in vivo bioavailability data. In vitro, genomic, and in vivo data sets were concurrently evaluated linking drug transport and the genomic fingerprint generated by spironolactone formulation exposure. Significant changes in gene expression are reported as a result of formulation exposure. These include genes coding for ATP-binding cassette (ABC) transporters, solute carrier (SLC) transporters, cytochrome P450 (CYP) enzymes, and carboxylesterase enzymes. Genomic findings better inform pre-clinical understanding of pharmacokinetic and pharmacodynamic responses to spironolactone and its active metabolites than current in vitro drug transport assays alone.


Asunto(s)
Composición de Medicamentos/métodos , Evaluación Preclínica de Medicamentos/métodos , Perfilación de la Expresión Génica/métodos , Espironolactona/administración & dosificación , Espironolactona/farmacocinética , Factores de Edad , Animales , Células CACO-2 , Diuréticos/administración & dosificación , Diuréticos/química , Diuréticos/farmacocinética , Expresión Génica , Humanos , Masculino , Ratas , Ratas Wistar , Espironolactona/química
15.
Antibiotics (Basel) ; 9(6)2020 Jun 17.
Artículo en Inglés | MEDLINE | ID: mdl-32560458

RESUMEN

Amino acids are ubiquitous vital biomolecules found in all kinds of living organisms including those in the microbial world. They are utilised as nutrients and control many biological functions in microorganisms such as cell division, cell wall formation, cell growth and metabolism, intermicrobial communication (quorum sensing), and microbial-host interactions. Amino acids in the form of enzymes also play a key role in enabling microbes to resist antimicrobial drugs. Antimicrobial resistance (AMR) and microbial biofilms are posing a great threat to the world's human and animal population and are of prime concern to scientists and medical professionals. Although amino acids play an important role in the development of microbial resistance, they also offer a solution to the very same problem i.e., amino acids have been used to develop antimicrobial peptides as they are highly effective and less prone to microbial resistance. Other important applications of amino acids include their role as anti-biofilm agents, drug excipients, drug solubility enhancers, and drug adjuvants. This review aims to explore the emerging paradigm of amino acids as potential therapeutic moieties.

16.
Sci Rep ; 10(1): 9021, 2020 06 02.
Artículo en Inglés | MEDLINE | ID: mdl-32488138

RESUMEN

Acidic amino acids, aspartic acid (Asp) and glutamic acid (Glu) can enhance the solubility of many poorly soluble drugs including ciprofloxacin (Cip). One of the mechanisms of resistance within a biofilm is retardation of drug diffusion due to poor penetration across the matrix. To overcome this challenge, this work set to investigate novel counter ion approach with acidic amino acids, which we hypothesised will disrupt the biofilm matrix as well as simultaneously improve drug effectiveness. The anti-biofilm activity of D-Asp and D-Glu was studied on Staphylococcus aureus biofilms. Synergistic effect of combining D-amino acids with Cip was also investigated as a strategy to overcome anti-microbial resistance in these biofilms. Interestingly at equimolar combinations, D-Asp and D-Glu were able to significantly disperse (at 20 mM and 40 mM) established biofilms and inhibit (at 10 mM, 20 mM and 40 mM) new biofilm formation in the absence of an antibiotic. Moreover, our study confirmed L-amino acids also exhibit anti-biofilm activity. The synergistic effect of acidic amino acids with Cip was observed at lower concentration ranges (<40 mM amino acids and <90.54 µM, respectively), which resulted in 96.89% (inhibition) and 97.60% (dispersal) reduction in CFU with exposure to 40 mM amino acids. Confocal imaging indicated that the amino acids disrupt the honeycomb-like extracellular DNA (eDNA) meshwork whilst also preventing its formation.


Asunto(s)
Antibacterianos/farmacología , Ácido Aspártico/farmacología , Ciprofloxacina/farmacología , Ácido Glutámico/farmacología , Staphylococcus aureus/efectos de los fármacos , Ácido Aspártico/administración & dosificación , Adhesión Bacteriana/efectos de los fármacos , Biopelículas/efectos de los fármacos , Recuento de Colonia Microbiana , Relación Dosis-Respuesta a Droga , Sinergismo Farmacológico , Ácido Glutámico/administración & dosificación , Pruebas de Sensibilidad Microbiana , Staphylococcus aureus/fisiología
17.
J Exp Neurosci ; 13: 1179069519837564, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-30944521

RESUMEN

Several studies have noted a correlation between retinal degeneration and traumatic encephalopathy (TE) making the retina a leading candidate for detection and assessment. Scattering-angle-resolved optical coherence tomography (SAR-OCT) is a candidate imaging modality to detect sub-resolution changes in retinal microstructure. SAR-OCT images of murine retinas that experience a hypoxic insult-euthanasia by isoflurane overdose-are presented. A total of 4 SAR-OCT measurement parameters are reported in 6 longitudinal experiments: blood flow volume fraction, total retinal thickness, reflectance index, and scattering angle. As each mouse expires, blood flow volume fraction decreases, total retinal thickness increases, reflectance index decreases, and scattering angle diversity increases. Contribution of the retinal vasculature to scattering angle diversity is discussed. Results of this study suggest the utility of SAR-OCT to measure TE using scattering angle diversity contrast in the retina.

18.
Bull Hosp Jt Dis (2013) ; 77(1): 57-63, 2019 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-30865866

RESUMEN

The basal joint is a collection of articulations at the base of thumb that serve an important function in the overall dexterity of the hand. The unique anatomy of the basal joint provided many evolutionary advantages to the human hand, but also made this joint susceptible to arthrosis and degenerative changes. Surgical treatment of basal joint arthritis has continued to evolve since it was first described in 1949, including excisional arthroplasty, tendon interposition, ligament reconstruction, implant arthroplasty, and arthroscopy. A review of the pathoanatomy, history, and surgical treatments are assessed including a critical review of the literature.


Asunto(s)
Artritis/cirugía , Articulaciones Carpometacarpianas/cirugía , Procedimientos Ortopédicos/métodos , Pulgar/cirugía , Artritis/diagnóstico por imagen , Artritis/historia , Artritis/fisiopatología , Fenómenos Biomecánicos , Articulaciones Carpometacarpianas/diagnóstico por imagen , Articulaciones Carpometacarpianas/patología , Articulaciones Carpometacarpianas/fisiopatología , Historia del Siglo XX , Historia del Siglo XXI , Humanos , Procedimientos Ortopédicos/efectos adversos , Procedimientos Ortopédicos/historia , Recuperación de la Función , Pulgar/diagnóstico por imagen , Pulgar/patología , Pulgar/fisiopatología , Resultado del Tratamiento
19.
Medicina (Kaunas) ; 54(6)2018 12 01.
Artículo en Inglés | MEDLINE | ID: mdl-30513764

RESUMEN

Background and objectives: The use of antibiotic prophylaxis in extraction and implant dentistry is still controversial, with varying opinions regarding their necessity. The overuse of antibiotics has led to widespread antimicrobial resistance and the emergence of multi drug resistant strains of bacteria. The main aim of this work was to determine whether there is a genuine need for antibiotic prophylaxis in two common dental procedures; dental implants and tooth extractions. Methods: Electronic searches were conducted across databases such as Cochrane Register of Controlled Trials, the UK National Health Service, Centre for reviews, Science Direct, PubMed and the British Dental Journal to identify clinical trials of either dental implants or tooth extractions, whereby the independent variable was systemic prophylactic antibiotics used as part of treatment in order to prevent postoperative complications such as implant failure or infection. Primary outcomes of interest were implant failure, and postoperative infections which include systemic bacteraemia and localised infections. The secondary outcome of interest was adverse events due to antibiotics. The Critical Appraisal Skills Programme tool was used to assess the risk of bias, extract outcomes of interest and to identify studies for inclusion in the meta-analysis. Results: Seven randomised clinical trials (RCTs) were included in the final review comprising n = 1368 patients requiring either tooth extraction(s) or dental implant(s). No statistically significant evidence was found to support the routine use of prophylactic antibiotics in reducing the risk of implant failure (p = 0.09, RR 0.43; 95% CI 0.16⁻1.14) or post-operative complications (p = 0.47, RR: 0.74; 95% CI 0.34⁻1.65) under normal conditions. Approximately 33 patients undergoing dental implant surgery need to receive antibiotics in order to prevent one implant failure from occurring. Conclusions: There is little conclusive evidence to suggest the routine use of antibiotic prophylaxis for third molar extractive surgery in healthy young adults. There was no statistical evidence for adverse events experienced for antibiotics vs. placebo. Based on our analysis, even if financially feasible, clinicians must carefully consider the appropriate use of antibiotics in dental implants and extraction procedures due to the risk of allergic reactions and the development of microbial drug resistance.


Asunto(s)
Antibacterianos/uso terapéutico , Profilaxis Antibiótica/métodos , Implantes Dentales , Extracción Dental , Adulto , Antibacterianos/efectos adversos , Profilaxis Antibiótica/efectos adversos , Bases de Datos Factuales , Farmacorresistencia Bacteriana Múltiple , Endocarditis/etiología , Endocarditis/mortalidad , Femenino , Humanos , Hipersensibilidad , Masculino , Persona de Mediana Edad , Ensayos Clínicos Controlados Aleatorios como Asunto , Infección de la Herida Quirúrgica/tratamiento farmacológico , Adulto Joven
20.
Genes (Basel) ; 9(11)2018 Nov 08.
Artículo en Inglés | MEDLINE | ID: mdl-30413090

RESUMEN

Despite a considerable body of published research on hepatitis B in Bangladesh, researchers continue to lament the lack of reliable information about hepatitis B virus (HBV) infection epidemiology. The present review aims to provide a comprehensive survey of the literature with particular focus on a number of epidemiological questions, as well as a commentary on the trends of hepatitis B research as it has taken place in Bangladesh. The key themes to emerge from this review are: first, beyond noting a declining trend, it is difficult to provide conclusive estimates about HBV prevalence in the general population of Bangladesh. The majority of the studies, even the ones conducted on apparently healthy populations, fail to be adequately representative for the reasons explored in the article. Secondly, HBV infection in Bangladesh is sharply stratified across sociodemographic lines, which speaks to the role of awareness and risk exposure in HBV prevalence. Third, more research on occult infection rates is required to estimate the extent of risk posed by the current blood donation screening program, which relies exclusively on hepatitis B surface antigen as a biomarker. The same considerations apply for the comparative importance of vertical versus horizontal transmission and prevalence among particular risk groups like healthcare workers with high occupational exposure. Finally, while recent studies do allow us, albeit with some ambiguity, to draw conclusions about distribution of HBV genotypes in Bangladesh, there needs to be an added emphasis on molecular epidemiology. It is hoped that the present review, the first of its kind in Bangladesh, will serve as an up-to-date summary of the course HBV epidemiology research in Bangladesh has taken thus far, as well as crucial gaps to address going forward.

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