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Aim: To synthesize a novel series of norfloxacin analogs and to evaluate biological activity. Methodology: Novel norfloxacin analogs were synthesized and characterized by NMR and mass spectrometry. Antiproliferative and antioxidant properties were studied. Results: Compound 2f was the most potent against HeLa cell-line with 100% inhibition of cell viability IC50 = 3.1 ± 0.2 µM. All compounds exhibit moderate to excellent antioxidant properties. Docking study demonstrates higher binding affinity of compounds with respective anticancer (B-cell lymphoma-2) and (tyrosinase) antioxidant targets. In silico absorption, distribution, metabolism and excretion profile of compounds proves all synthesized compounds follow Lipinski's rule of drug likeness, non toxic and possess passive gastrointestinal absorption. Conclusion: The biological profile suggest that the synthesized norfloxacin analogs can be a novel scaffold for future anticancer drug development.
[Box: see text].
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This study aims to remove Congo red dye from industrial effluent using economical agriculturally-based nano-biosorbents like magnetic orange peel, peanut shells, and tea waste. The nano-biosorbents were characterized by various analytical techniques like SEM, FT-IR, BET and XRD. The highest adsorption capacity was obtained under the following ideal conditions: pH = 6 (orange peel and peanut shells), pH = 3 (tea waste), and dosages of nano-biosorbents with varying timeframes of 50 min for tea waste and peanut shells and 30 min for orange peel. The study found that tea waste had the highest removal rate of 94% due to its high porosity and responsible functional groups, followed by peanut shells at 83% and orange peel at 68%. The Langmuir isotherm model was found to be the most suitable, with R2 values of 0.99 for tea waste, 0.92 for orange peel, and 0.71 for peanut shells. On the other hand, a pseudo-second-order kinetic model was very feasible, showing an R2 value of 0.99 for tea waste, 0.98 for peanut shells and 0.97 for orange peel. The significance of the current study lies in its practical application, enabling efficient waste management and water purification, thereby preserving a clean and safe environment.
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Vermelho Congo , Vermelho Congo/química , Cinética , Adsorção , Agricultura , Poluentes Químicos da Água/química , Resíduos Industriais , Espectroscopia de Infravermelho com Transformada de Fourier , Chá/química , Arachis/química , Concentração de Íons de HidrogênioRESUMO
BACKGROUND AND OBJECTIVES: Prognostic factors reliably predicting outcomes for critically ill adolescent and young adult (AYA) patients undergoing allogeneic hematopoietic cell transplantation (allo-HSCT) are lacking. We assessed transplant and intensive care unit (ICU)-related factors impacting patient outcomes. PATIENTS AND METHODS: AYA patients who underwent allo-HSCT and required ICU admission at a Tertiary care Centre, during the period of 2003-2013, were included in this retrospective review. This was a non-interventional study. Only outcomes after the first allo-HSCT and index ICU admissions were analyzed. Disease-, transplant-, and ICU-related variables were analyzed to identify risk factors predictive of survival. RESULTS: Overall, 152 patients were included (males, 60.5%); median age at transplantation was 24 years (interquartile range [IQR] 18-32.5); median age at admission to the ICU was 25.8 years (IQR 19-34). Eighty-four percent underwent transplantation for a hematological malignancy; 129 (85%) received myeloablative conditioning. Seventy-one percent of ICU admissions occurred within the first year after allo-HSCT. ICU admission was primarily due to respiratory failure (47.3%) and sepsis (43.4%). One hundred and three patients (68%) died within 28 days of ICU admission. The 1- and 5-year overall survival rates were 19% and 17%, respectively. Main causes for ICU-related death were refractory septic shock with multiorgan failure (n = 49, 32%) and acute respiratory distress syndrome (ARDS) (n = 39, 26%). Univariate analysis showed that ICU mortality was associated with an Acute Physiology and Chronic Health Evaluation (APACHE) II score >20, a sequential organ failure assessment (SOFA score) > 12, a high lactate level, anemia, thrombocytopenia, leukopenia, hyperbilirubinemia, a high international normalized ratio (INR) and acute graft-versus-host disease (GVHD). Multivariate analysis identified thrombocytopenia, high INR, and acute GVHD as independent predictors of mortality. CONCLUSIONS: In AYA allo-HSCT patients admitted to the ICU, mortality remains high. Higher SOFA and APACHE scores, the need for organ support, thrombocytopenia, coagulopathy, and acute GVHD predict poor outcomes.
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Doença Enxerto-Hospedeiro , Transplante de Células-Tronco Hematopoéticas , Trombocitopenia , Masculino , Humanos , Adolescente , Adulto Jovem , Adulto , Cuidados Críticos , Unidades de Terapia Intensiva , Estudos Retrospectivos , Transplante de Células-Tronco Hematopoéticas/efeitos adversos , Doença Enxerto-Hospedeiro/etiologia , Trombocitopenia/etiologiaRESUMO
OBJECTIVE: To determine the association of GSTM1 and GSTT1 polymorphisms with oral submucous fibrosis (OSF). STUDY DESIGN: A case-control study. Place and Duration of the Study: Department of Human Genetics and Molecular Biology, University of Health Sciences, Lahore and Oral and Maxillofacial Surgery Department, de Montmorency, College of Dentistry/ Punjab Dental Hospital, Lahore, Pakistan, from 1st April 2019 to 31st April 2020. METHODOLOGY: OSF patients were diagnosed with different clinical staging of mouth opening by Vernier caliper with the help of a professional dentist in the Department of Oral and Maxillofacial, de Montmorency, College of Dentistry, Lahore. One hundred and eight blood samples of OSF patients and 108 samples of normal controls were collected. Genomic DNA was obtained from whole-blood extraction. Multiplex PCR amplification using GSTM1, GSTT1, and ß -Globin gene primers was performed. RESULTS: GSTM1 and GSTT1 null genotypes frequencies were found in 43.5% (47/108) and 13.9% (15/108) of controls, whereas 54.6% (59/108) and 25.9% (28/108) of OSF patients, respectively. OSF patients had a greater frequency rate of GSTM1 and GSTT1 null genotypes than controls [OR 1.56, 95% CI 0.91-2.67 (p=0.13)] and [OR 2.17, 95% CI 1.08-4.34 (p=0.04)], respectively. The GSTT1 genotype was found statistically significant with OSF (p=0.05), and risk was also determined. The cumulative effect of null genotypes of GSTM1/GSTT1 did not show any association with the controls and in OSF patients. Proportions of active and null alleles of the patient group were; 86.1%/13.9%; and in control, it was 92.6%/7.4% (OR = 2.01; CI: 0.82-4.97; p=0.18), respectively. CONCLUSION: The study determined a statistically significant association of GSTT1 gene polymorphism with OSF. KEY WORDS: Oral submucous fibrosis, GSTM1, GSTT1, Gene polymorphisms, Genetic risk.
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Fibrose Oral Submucosa , Humanos , Estudos de Casos e Controles , Predisposição Genética para Doença , Genótipo , Glutationa Transferase/genética , Fibrose Oral Submucosa/genética , Polimorfismo Genético , Fatores de RiscoRESUMO
Aim: To synthesize novel chloroquine analogues and evaluate them for antimicrobial and cytotoxic potential. Methods: Novel analogues were synthesized from chloroquine by nucleophilic substitution reaction at the 4-amino position. Results: Analogue CS1 showed maximum antimicrobial potential (30.3 ± 0.15 mm zone) against Pseudomonas aeruginosa and produced a 19.2 ± 0.21 mm zone against Candida albicans, while CS0 produced no zone at the same concentration. Analogue CS9 has excellent cytotoxic potential (HeLa cell line), showing 100% inhibition (IC50 = 8.9 ± 1.2 µg/ml), compared with CS0 (61.9% inhibition at 30 µg/ml). Conclusion: These synthesized chloroquine analogues have excellent activity against different microbial strains and cervical cancer cell lines (HeLa) compared with their parent molecule.
[Box: see text].
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Antineoplásicos , Candida albicans , Cloroquina , Testes de Sensibilidade Microbiana , Pseudomonas aeruginosa , Humanos , Candida albicans/efeitos dos fármacos , Cloroquina/farmacologia , Cloroquina/química , Pseudomonas aeruginosa/efeitos dos fármacos , Células HeLa , Antineoplásicos/farmacologia , Antineoplásicos/química , Antineoplásicos/síntese química , Antibacterianos/farmacologia , Antibacterianos/química , Antibacterianos/síntese química , Relação Estrutura-Atividade , Antifúngicos/farmacologia , Antifúngicos/química , Antifúngicos/síntese química , Estrutura Molecular , Ensaios de Seleção de Medicamentos Antitumorais , Proliferação de Células/efeitos dos fármacos , Anti-Infecciosos/farmacologia , Anti-Infecciosos/química , Anti-Infecciosos/síntese químicaRESUMO
Practical application of triboelectric nanogenerators (TENGs) has been challenging, particularly, under harsh environmental conditions. This work proposes a novel 3D-fused aromatic ladder (FAL) structure as a tribo-positive material for TENGs, to address these challenges. The 3D-FAL offers a unique materials engineering platform for tailored properties, such as high specific surface area and porosity, good thermal and mechanical stability, and tunable electronic properties. The fabricated 3D-FAL-based TENG reaches a maximum peak power density of 451.2 µW cm-2 at 5 Hz frequency. More importantly, the 3D-FAL-based TENG maintains stable output performance under harsh operating environments, over wide temperature (-45-100 °C) and humidity ranges (8.3-96.7% RH), representing the development of novel FAL for sustainable energy generation under challenging environmental conditions. Furthermore, the 3D-FAL-based TENG proves to be a promising device for a speed monitoring system engaging reconstruction in virtual reality in a snowy environment.
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Glipizide, a poor water-soluble drug belongs to BCS class II. The proposed work aimed to enhance the solubility of glipizide by preparing solid dispersions, using polyvinyl pyrrolidone (PVP) and polyethylene glycol (PEG). Solvent evaporation method was used for the preparation of glipizide solid dispersions. Solid dispersions were prepared in four different drug-to-polymer ratios i.e. 1:1, 1:2, 1:3 and 1:4. Mainly effect of three polymers (PVP K30, PVP K90 and PEG 6000) was evaluated on the solubility and dissolution of glipizide. The in-vitro dissolution of all prepared formulations was performed under pH 6.8 at 37°C using USP type II apparatus. In-vitro dissolution results revealed that the formulations having high concentrations of the polymer showed enhanced solubility. Enhancements in the solubility and rate of dissolution of the drug were noted in solid dispersion formulations compared to the physical blends and pure drug. Solid dispersions containing polyvinyl pyrrolidone exhibited a more favorable pattern of drug release compared to the corresponding solid dispersions with PEG. An increase in the maximum solubility of the drug within the solid dispersion systems was observed in all instances. Two solid dispersion formulations were optimized and formulated into immediate-release tablets, which passed all the pharmacopoeial and non-pharmacopoeial tests. Fourier transformed Infrared (FTIR) spectroscopy X-ray diffraction (XRD) and Differential scanning calorimetry (DSC) were used to indicate drug: polymer interactions in solid state. Analysis of the solid dispersion samples through characterization tests indicated the compatibility between the drug and the polymer.
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Glipizida , Polivinil , Solubilidade , Polímeros/química , Polietilenoglicóis/química , Espectroscopia de Infravermelho com Transformada de Fourier/métodos , Povidona/química , Difração de Raios X , Varredura Diferencial de CalorimetriaRESUMO
Diffuse midline glioma (DMG), including tumors diagnosed in the brainstem (diffuse intrinsic pontine glioma; DIPG), are uniformly fatal brain tumors that lack effective treatment. Analysis of CRISPR/Cas9 loss-of-function gene deletion screens identified PIK3CA and MTOR as targetable molecular dependencies across patient derived models of DIPG, highlighting the therapeutic potential of the blood-brain barrier-penetrant PI3K/Akt/mTOR inhibitor, paxalisib. At the human-equivalent maximum tolerated dose, mice treated with paxalisib experienced systemic glucose feedback and increased insulin levels commensurate with patients using PI3K inhibitors. To exploit genetic dependence and overcome resistance while maintaining compliance and therapeutic benefit, we combined paxalisib with the antihyperglycemic drug metformin. Metformin restored glucose homeostasis and decreased phosphorylation of the insulin receptor in vivo, a common mechanism of PI3K-inhibitor resistance, extending survival of orthotopic models. DIPG models treated with paxalisib increased calcium-activated PKC signaling. The brain penetrant PKC inhibitor enzastaurin, in combination with paxalisib, synergistically extended the survival of multiple orthotopic patient-derived and immunocompetent syngeneic allograft models; benefits potentiated in combination with metformin and standard-of-care radiotherapy. Therapeutic adaptation was assessed using spatial transcriptomics and ATAC-Seq, identifying changes in myelination and tumor immune microenvironment crosstalk. Collectively, this study has identified what we believe to be a clinically relevant DIPG therapeutic combinational strategy.
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Neoplasias do Tronco Encefálico , Glioma Pontino Intrínseco Difuso , Glioma , Metformina , Humanos , Camundongos , Animais , Glioma Pontino Intrínseco Difuso/tratamento farmacológico , Glioma Pontino Intrínseco Difuso/genética , Fosfatidilinositol 3-Quinases/genética , Neoplasias do Tronco Encefálico/tratamento farmacológico , Neoplasias do Tronco Encefálico/genética , Glioma/tratamento farmacológico , Glioma/genética , Glioma/patologia , Serina-Treonina Quinases TOR/genética , Inibidores de Proteínas Quinases/farmacologia , Inibidores de Proteínas Quinases/uso terapêutico , Inibidores de Fosfoinositídeo-3 Quinase/uso terapêutico , Glucose , Metformina/farmacologia , Microambiente TumoralRESUMO
Trillium govanianum is a high-value medicinal herb, having multifunctional traditional and culinary uses. The present investigation was carried out to evaluate the phytochemical, biological and toxicological parameters of the T. govanianum Wall. ex D. Don (Family: Trilliaceae) roots collected from Azad Kashmir, Pakistan. Phytochemical profiling was achieved by determining total bioactive contents (total phenolic and flavonoid contents) and UHPLC-MS analysis. For biological evaluation, antioxidant activities (DPPH, ABTS, FRAP, CUPRAC, phosphomolybdenum, and metal chelation assays) and enzyme inhibition activities (against AChE, BChE, glucosidase, amylase, and tyrosinase) were performed. Moreover, cytotoxicity was assessed against three human carcinoma cell lines (MDA-MB-231, CaSki, and DU-145). The tested extract was found to contain higher total phenolics (7.56â mg GAE/g dry extract) as compared to flavonoid contents (0.45â mg RE/g dry extract). Likewise, for the antioxidant activity, higher CUPRAC activity was noted with 39.84â mg TE/g dry extract values. In the case of enzyme assays, higher activity was pointed out against the cholinesterase, glucosidase and tyrosinase enzymes. The plant extract displayed significant cytotoxicity against the cell lines examined. Moreover, the in-silico studies highlighted the interaction between the important phytochemicals and tested enzymes. To conclude, the assessed biological activity and the existence of bioactive phytochemicals in the studied plant extract may pave the way for the development of novel pharmaceuticals.
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Trillium , Humanos , Trillium/química , Monofenol Mono-Oxigenase , Antioxidantes/farmacologia , Antioxidantes/química , Flavonoides/farmacologia , Flavonoides/análise , Extratos Vegetais/farmacologia , Extratos Vegetais/química , Glucosidases , Compostos Fitoquímicos/químicaRESUMO
Aim: To synthesize and explore the therapeutic potential of amodiaquine analogues. Methodology: New promising analogues were synthesized by nucleophilic substitution at the 4-amino position and were characterized using 1H NMR, 13C NMR and FT-IR spectroscopic techniques. Results: Antibacterial and cytotoxic screening revealed the high potency of these compounds; analogue AS1 had an 34.3 ± 0.18 mm zone of inhibition against Pseudomonas aeruginosa. Excellent activity against fungal strains, that is, Candida albicans (39.6 ± 0.23 mm) was shown by analogue AS2. Analogue AS1 had an IC50 = 4.2 µg/ml against the HeLa cell line (cervical cancer) and binding energy against 5GWK (-8.32688 kcal/mol), 1PFK (-6.4780 kcal/mol) and 1TUP (-6.5279 kcal/mol) in the docking study. Conclusion: The obtained results reveal that these analogues exhibit potent antimicrobial and cytotoxic potential.
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Antineoplásicos , Neoplasias do Colo do Útero , Feminino , Humanos , Estrutura Molecular , Células HeLa , Relação Estrutura-Atividade , Amodiaquina/farmacologia , Neoplasias do Colo do Útero/tratamento farmacológico , Espectroscopia de Infravermelho com Transformada de Fourier , Antineoplásicos/farmacologia , Antineoplásicos/química , Antibacterianos/farmacologia , Antibacterianos/química , Candida albicans , Testes de Sensibilidade Microbiana , Simulação de Acoplamento MolecularRESUMO
The Adult Congenital Heart Disease (ACHD) fellowship is a two-year fellowship that can be done by physicians who have finished their internal medicine residency and cardiology fellowship. This study evaluated the accessibility and provided information on the websites of the ACHD fellowship programs to identify potential areas of improvement for future fellowship applicants. Analysis of 25 ACHD fellowship program websites was conducted based on 34 criteria under three main categories: recruitment information, education and research information, and incentive information. This study found that many evaluated ACHD program websites lacked information regarding recruitment. Specifically, information regarding mentorship opportunities, hospital statistics/number of beds, selection process, and interview dates, leaving out crucial details on what to expect during the matching process. Additionally, more information on education and research is beneficial for applicants to sufficiently compare ACHD fellowship programs and make more informed decisions about which programs they would like to apply to. Information on academic stipends, evaluation criteria, expected caseload, moonlighting opportunities, elective opportunities, rotation schedules, call requirements, and types of procedures were all limited across multiple websites. Lastly, incentive information was found to be insufficient across most ACHD fellowship websites. Incentive information included fellow wellness, harassment policies, parental leave, salary, benefits, and vacation/sick leave. This study shows that ACHD fellowship programs need to supply more information on their websites to provide applicants with details to help them choose the fellowship program that corresponds best with their career goals. Expanding upon information regarding recruitment, education, research, and incentives will provide applicants with a strong understanding of ACHD fellowship programs and what they can expect throughout their education. In return, this will help ACHD fellowship programs attract stronger applicants, ultimately improving the quality of their respective programs.
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Background: Fifteen million babies are born preterm globally each year, with 81% occurring in low- and middle-income countries (LMICs). Preterm birth complications are the leading cause of newborn deaths and significantly impact health, quality of life, and costs of health services. Improving outcomes for newborns and their families requires prioritising research for developing practical, scalable solutions, especially in low-resource settings such as Bangladesh. We aimed to identify research priorities related to preventing and managing preterm birth in LMICs for 2021-2030, with a special focus on Bangladesh. Methods: We adopted the Child Health and Nutrition Research Initiative (CHNRI) method to set research priorities for preventing and managing preterm birth. Seventy-six experts submitted 490 research questions online, which we collated into 95 unique questions and sent for scoring to all experts. A hundred and nine experts scored the questions using five pre-selected criteria: answerability, effectiveness, deliverability, maximum potential for burden reduction, and effect on equity. We calculated weighted and unweighted research priority scores and average expert agreement to generate a list of top-ranked research questions for LMICs and Bangladesh. Results: Health systems and policy research dominated the top 20 identified priorities for LMICs, such as understanding and improving uptake of the facility and community-based Kangaroo Mother Care (KMC), promoting breastfeeding, improving referral and transport networks, evaluating the impact of the use of skilled attendants, quality improvement activities, and exploring barriers to antenatal steroid use. Several of the top 20 questions also focused on screening high-risk women or the general population of women, understanding the causes of preterm birth, or managing preterm babies with illnesses (jaundice, sepsis and retinopathy of prematurity). There was a high overlap between research priorities in LMICs and Bangladesh. Conclusions: This exercise, aimed at identifying priorities for preterm birth prevention and management research in LMICs, especially in Bangladesh, found research on improving the care of preterm babies to be more important in reducing the burden of preterm birth and accelerating the attainment of Sustainable Development Goal 3 target of newborn deaths, by 2030.
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Método Canguru , Nascimento Prematuro , Feminino , Recém-Nascido , Gravidez , Humanos , Países em Desenvolvimento , Bangladesh/epidemiologia , Saúde da Criança , Nascimento Prematuro/prevenção & controle , Qualidade de Vida , Projetos de PesquisaRESUMO
Key Clinical Message: Syncopal patients should be evaluated for cardiac causes, including myxoma, as highlighted in this case. Transthoracic echocardiography and coronary angiography are valuable diagnostic tools. Interventional cardiology plays a crucial role in the successful treatment of myxoma. Abstract: This case video describes the presentation and successful treatment of a 58-year-old woman who experienced recurrent episodes of syncope. After ruling out other health concerns, a pulmonary embolism was suspected and further investigations revealed a mass in the left atrium causing significant obstruction of the mitral valve. The mass, identified as a neovascularized myxoma, was successfully resected, emphasizing the significance of considering myxoma as a potential cause of syncope and highlighting the role of interventional cardiology in its management.
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Diffuse midline gliomas (DMG), including diffuse intrinsic pontine gliomas (DIPGs), are the most lethal of childhood cancers. Palliative radiotherapy is the only established treatment, with median patient survival of 9-11 months. ONC201 is a DRD2 antagonist and ClpP agonist that has shown preclinical and emerging clinical efficacy in DMG. However, further work is needed to identify the mechanisms of response of DIPGs to ONC201 treatment and to determine whether recurring genomic features influence response. Using a systems-biological approach, we showed that ONC201 elicits potent agonism of the mitochondrial protease ClpP to drive proteolysis of electron transport chain and tricarboxylic acid cycle proteins. DIPGs harboring PIK3CA-mutations showed increased sensitivity to ONC201, while those harboring TP53-mutations were more resistant. Metabolic adaptation and reduced sensitivity to ONC201 was promoted by redox-activated PI3K/Akt signaling, which could be counteracted using the brain penetrant PI3K/Akt inhibitor, paxalisib. Together, these discoveries coupled with the powerful anti-DIPG/DMG pharmacokinetic and pharmacodynamic properties of ONC201 and paxalisib have provided the rationale for the ongoing DIPG/DMG phase II combination clinical trial NCT05009992.
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Diffuse midline gliomas (DMG), including diffuse intrinsic pontine gliomas (DIPG), are the most lethal of childhood cancers. Palliative radiotherapy is the only established treatment, with median patient survival of 9 to 11 months. ONC201 is a DRD2 antagonist and ClpP agonist that has shown preclinical and emerging clinical efficacy in DMG. However, further work is needed to identify the mechanisms of response of DIPGs to ONC201 treatment and to determine whether recurring genomic features influence response. Using a systems-biological approach, we showed that ONC201 elicits potent agonism of the mitochondrial protease ClpP to drive proteolysis of electron transport chain and tricarboxylic acid cycle proteins. DIPGs harboring PIK3CA mutations showed increased sensitivity to ONC201, whereas those harboring TP53 mutations were more resistant. Metabolic adaptation and reduced sensitivity to ONC201 was promoted by redox-activated PI3K/Akt signaling, which could be counteracted using the brain penetrant PI3K/Akt inhibitor, paxalisib. Together, these discoveries coupled with the powerful anti-DIPG/DMG pharmacokinetic and pharmacodynamic properties of ONC201 and paxalisib have provided the rationale for the ongoing DIPG/DMG phase II combination clinical trial NCT05009992. SIGNIFICANCE: PI3K/Akt signaling promotes metabolic adaptation to ONC201-mediated disruption of mitochondrial energy homeostasis in diffuse intrinsic pontine glioma, highlighting the utility of a combination treatment strategy using ONC201 and the PI3K/Akt inhibitor paxalisib.
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Veterinary clinical skills training is evolving rapidly around the world and there is increasing interest in Bangladesh in opening clinical skills laboratories and using models in teaching. The first clinical skills laboratory was opened at Chattogram Veterinary and Animal Sciences University in 2019. The current study aimed to identify the most important clinical skills for veterinarians in Bangladesh to inform the further development of clinical skills laboratories and ensure resources are deployed effectively and efficiently. Lists of clinical skills were collated from the literature, national and international accreditation standards, and regional syllabi. The list was refined through local consultation, focused on farm and pet animals, and was disseminated via an online survey to veterinarians and final-year students who were asked to rate the level of importance of each skill for a new graduate. The survey was completed by 215 veterinarians and 115 students. A ranked list was generated with injection techniques, animal handling, clinical examination, and basic surgical skills among the most important. Some techniques requiring specific equipment and some advanced surgical procedures were considered less important. As a result of the study, the most important clinical skills for a new graduate in Bangladesh have been identified for the first time. The results will inform the development of models, the use of clinical skills laboratories, and the design of clinical skills courses for veterinary training. Our approach of drawing upon existing lists followed by local stakeholders consultation is recommended to others to ensure clinical skills teaching is regionally relevant.
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Mutations in the type III receptor tyrosine kinase FLT3 are frequent in patients with acute myeloid leukemia (AML) and are associated with a poor prognosis. AML is characterized by the overproduction of reactive oxygen species (ROS), which can induce cysteine oxidation in redox-sensitive signaling proteins. Here, we sought to characterize the specific pathways affected by ROS in AML by assessing oncogenic signaling in primary AML samples. The oxidation or phosphorylation of signaling proteins that mediate growth and proliferation was increased in samples from patient subtypes with FLT3 mutations. These samples also showed increases in the oxidation of proteins in the ROS-producing Rac/NADPH oxidase-2 (NOX2) complex. Inhibition of NOX2 increased the apoptosis of FLT3-mutant AML cells in response to FLT3 inhibitors. NOX2 inhibition also reduced the phosphorylation and cysteine oxidation of FLT3 in patient-derived xenograft mouse models, suggesting that decreased oxidative stress reduces the oncogenic signaling of FLT3. In mice grafted with FLT3 mutant AML cells, treatment with a NOX2 inhibitor reduced the number of circulating cancer cells, and combining FLT3 and NOX2 inhibitors increased survival to a greater extent than either treatment alone. Together, these data raise the possibility that combining NOX2 and FLT3 inhibitors could improve the treatment of FLT3 mutant AML.
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Cisteína , Leucemia Mieloide Aguda , Humanos , Animais , Camundongos , Espécies Reativas de Oxigênio/metabolismo , Cisteína/genética , Leucemia Mieloide Aguda/tratamento farmacológico , Leucemia Mieloide Aguda/genética , Leucemia Mieloide Aguda/metabolismo , Mutação , Inibidores de Proteínas Quinases/farmacologia , Modelos Animais de Doenças , Linhagem Celular Tumoral , Tirosina Quinase 3 Semelhante a fms/genéticaRESUMO
Alzheimer's disease (AD) is a complex, multifactorial and most prevalent progressive neurodegenerative ailment. Its multifactorial and complex nature causes the lack of disease modifying drugs. Hence, multi-target drug design strategies have been adopted to halt the progression of AD. In current research, we applied multitarget strategy to tackle multifactorial nature of AD. Rational design and synthesis of framework of hybrids containing Pyrimidine/pyrrolidine-sertraline scaffolds were carried out. The synthesized compounds were further evaluated for their in-vitro enzyme inhibition potential against cholinesterases, monoamine oxidases and ß-site amyloid precursor protein cleaving enzyme-1 (BACE-1). Compound 19 emerged as an optimal multipotent hybrid with IC50 values of 0.07 µM, 0.09 µM, 0.63 µM, 0.21 µM and 0.73 µM against AChE, BChE, MAO-A, MAO-B and BACE-1 respectively. After in-vivo cytotoxicity and in-vitro PAMPA blood brain barrier permeation assays, a number of widely used behavioral assessment tests were also performed for the evaluation of memory and learning.Determination of biochemical parameters showed low levels of acetylcholinesterase by the treatment with synthesized compounds. Furthermore, levels of neurotransmitters such as serotonin, dopamine and noradrenaline were also analyzed. Increased neurotransmitter levels showed the improved short and long-term memory as well as enhanced learning behavior. Docking studies on the target enzymes showed correlation with the experimental in-vitro enzyme inhibition results.