Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 93
Filtrar
Más filtros

Bases de datos
País/Región como asunto
Tipo del documento
Intervalo de año de publicación
1.
EMBO J ; 39(2): e102602, 2020 01 15.
Artículo en Inglés | MEDLINE | ID: mdl-31802519

RESUMEN

Plants establish mutualistic associations with beneficial microbes while deploying the immune system to defend against pathogenic ones. Little is known about the interplay between mutualism and immunity and the mediator molecules enabling such crosstalk. Here, we show that plants respond differentially to a volatile bacterial compound through integral modulation of the immune system and the phosphate-starvation response (PSR) system, resulting in either mutualism or immunity. We found that exposure of Arabidopsis thaliana to a known plant growth-promoting rhizobacterium can unexpectedly have either beneficial or deleterious effects to plants. The beneficial-to-deleterious transition is dependent on availability of phosphate to the plants and is mediated by diacetyl, a bacterial volatile compound. Under phosphate-sufficient conditions, diacetyl partially suppresses plant production of reactive oxygen species (ROS) and enhances symbiont colonization without compromising disease resistance. Under phosphate-deficient conditions, diacetyl enhances phytohormone-mediated immunity and consequently causes plant hyper-sensitivity to phosphate deficiency. Therefore, diacetyl affects the type of relation between plant hosts and certain rhizobacteria in a way that depends on the plant's phosphate-starvation response system and phytohormone-mediated immunity.


Asunto(s)
Arabidopsis/inmunología , Diacetil/farmacología , Fosfatos/metabolismo , Enfermedades de las Plantas/inmunología , Inmunidad de la Planta/inmunología , Raíces de Plantas/inmunología , Arabidopsis/efectos de los fármacos , Arabidopsis/crecimiento & desarrollo , Arabidopsis/metabolismo , Bacterias/inmunología , Bacterias/metabolismo , Enfermedades de las Plantas/microbiología , Inmunidad de la Planta/efectos de los fármacos , Raíces de Plantas/efectos de los fármacos , Raíces de Plantas/crecimiento & desarrollo , Raíces de Plantas/metabolismo , Rizosfera , Simbiosis , Compuestos Orgánicos Volátiles/farmacología
2.
Cell Biol Int ; 2024 Jun 04.
Artículo en Inglés | MEDLINE | ID: mdl-38837523

RESUMEN

Platelets are essential component of circulation that plays a major role in hemostasis and thrombosis. During activation and its demise, platelets release platelet-derived microvesicles, with lysophosphatidylcholine (LPC) being a prominent component in their lipid composition. LPC, an oxidized low-density lipoprotein, is involved in cellular metabolism, but its higher level is implicated in pathologies like atherosclerosis, diabetes, and inflammatory disorders. Despite this, its impact on platelet function remains relatively unexplored. To address this, we studied LPC's effects on washed human platelets. A multimode plate reader was employed to measure reactive oxygen species and intracellular calcium using H2DCF-DA and Fluo-4-AM, respectively. Flow cytometry was utilized to measure phosphatidylserine expression, mitochondrial membrane potential (ΔΨm), and mitochondrial permeability transition pore (mPTP) formation using FITC-Annexin V, JC-1, and CoCl2/calcein-AM, respectively. Additionally, platelet morphology and its ultrastructure were observed via phase contrast and electron microscopy. Sonoclot and light transmission aggregometry were employed to examine fibrin formation and platelet aggregation, respectively. The findings demonstrate that LPC induced oxidative stress and increased intracellular calcium in platelets, resulting in increased phosphatidylserine expression and reduced ΔΨm. LPC triggered caspase-independent platelet death and mPTP opening via cytosolic and mitochondrial calcium, along with microvesiculation and reduced platelet counts. LPC increased the platelet's size, adopting a balloon-shaped morphology, causing membrane fragmentation and releasing its cellular contents, while inducing a pro-coagulant phenotype with increased fibrin formation and reduced integrin αIIbß3 activation. Conclusively, this study reveals LPC-induced oxidative stress and calcium-mediated platelet death, necrotic in nature with pro-coagulant properties, potentially impacting inflammation and repair mechanisms during vascular injury.

3.
Org Biomol Chem ; 22(16): 3109-3185, 2024 Apr 24.
Artículo en Inglés | MEDLINE | ID: mdl-38529599

RESUMEN

Iodine-containing molecules, especially hypervalent iodine compounds, have gained significant attention in organic synthesis. They are valuable and sustainable reagents, leading to a remarkable surge in their use for chemical transformations. One such hypervalent iodine compound, phenyliodine bis(trifluoroacetate)/bis(trifluoroacetoxy)iodobenzene, commonly referred to as PIFA, has emerged as a prominent candidate due to its attributes of facile manipulation, moderate reactivity, low toxicity, and ready availability. PIFA presents an auspicious prospect as a substitute for costly organometallic catalysts and environmentally hazardous oxidants containing heavy metals. PIFA exhibits remarkable catalytic activity, facilitating an array of consequential organic reactions, including sulfenylation, alkylarylation, oxidative coupling, cascade reactions, amination, amidation, ring-rearrangement, carboxylation, and numerous others. Over the past decade, the application of PIFA in synthetic chemistry has witnessed substantial growth, necessitating an updated exploration of this field. In this discourse, we present a concise overview of PIFA's applications as a 'green' reagent in the domain of synthetic organic chemistry. A primary objective of this article is to bring to the forefront the scientific community's awareness of the merits associated with adopting PIFA as an environmentally conscientious alternative to heavy metals.

4.
Mol Biol Rep ; 51(1): 48, 2024 Jan 02.
Artículo en Inglés | MEDLINE | ID: mdl-38165499

RESUMEN

Alzheimer's disease's pathophysiology is still a conundrum. Growing number of evidences have elucidated the involvement of oxidative stress in the pathology of AD rendering it a major target for therapeutic development. Reactive oxygen species (ROS) generated by altered mitochondrial function, dysregulated electron transport chain and other sources elevate aggregated Aß and neurofibrillary tangles which further stimulating the production of ROS. Oxidative stress induced damage to lipids, proteins and DNA result in neuronal death which leads to AD. In addition, oxidative stress induces apoptosis that is triggered by the modulation of ERK1/2 and Nrf2 pathway followed by increased GSK-3ß expression and decreased PP2A activity. Oxidative stress exaggerates disease condition by interfering with various signaling pathways like RCAN1, CREB/ERK, Nrf2, PP2A, NFκB and PI3K/Akt. Studies have reported the role of TNF-α in oxidative stress stimulation that has been regulated by drugs like etanercept increasing the level of anti-oxidants. Other drugs like pramipexole, memantine, carvedilol, and melatonin have been reported to activate CREB/RCAN1 and Nrf2 pathways. In line with this, epigallocatechin gallate and genistein also target Nrf2 and CREB pathway leading to activation of downstream pathways like ARE and Keap1 which ameliorate oxidative stress condition. Donepezil and resveratrol reduce oxidative stress and activate AMPK pathway along with PP2A activation thus promoting tau dephosphorylation and neuronal survival. This study describes in detail the role of oxidative stress in AD, major signaling pathways involving oxidative stress induced AD and drugs under development targeting these pathways which may aid in therapeutic advances for AD.


Asunto(s)
Enfermedad de Alzheimer , Humanos , Enfermedad de Alzheimer/tratamiento farmacológico , Proteína 1 Asociada A ECH Tipo Kelch , Especies Reactivas de Oxígeno , Glucógeno Sintasa Quinasa 3 beta , Factor 2 Relacionado con NF-E2 , Fosfatidilinositol 3-Quinasas , Estrés Oxidativo , Transducción de Señal
5.
Med Res Rev ; 43(6): 1835-1877, 2023 11.
Artículo en Inglés | MEDLINE | ID: mdl-37132460

RESUMEN

The blood platelet plays an important role but often remains under-recognized in several vascular complications and associated diseases. Surprisingly, platelet hyperactivity and hyperaggregability have often been considered the critical risk factors for developing vascular dysfunctions in several neurodegenerative diseases (NDDs) like Alzheimer's disease, Parkinson's disease, Huntington's disease, and multiple sclerosis. In addition, platelet structural and functional impairments promote prothrombotic and proinflammatory environment that can aggravate the progression of several NDDs. These findings provide the rationale for using antiplatelet agents not only to prevent morbidity but also to reduce mortality caused by NDDs. Therefore, we thoroughly review the evidence supporting the potential pleiotropic effects of several novel classes of synthetic antiplatelet drugs, that is, cyclooxygenase inhibitors, adenosine diphosphate receptor antagonists, protease-activated receptor blockers, and glycoprotein IIb/IIIa receptor inhibitors in NDDs. Apart from this, the review also emphasizes the recent developments of selected natural antiplatelet phytochemicals belonging to key classes of plant-based bioactive compounds, including polyphenols, alkaloids, terpenoids, and flavonoids as potential therapeutic candidates in NDDs. We believe that the broad analysis of contemporary strategies and specific approaches for plausible therapeutic treatment for NDDs presented in this review could be helpful for further successful research in this area.


Asunto(s)
Enfermedad de Alzheimer , Enfermedad de Huntington , Enfermedades Neurodegenerativas , Enfermedad de Parkinson , Humanos , Enfermedades Neurodegenerativas/tratamiento farmacológico , Inhibidores de Agregación Plaquetaria/farmacología , Inhibidores de Agregación Plaquetaria/uso terapéutico
6.
Cell Biol Int ; 47(12): 1964-1975, 2023 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-37650361

RESUMEN

Platelet-derived microvesicles (PMVs) represent a significant proportion of microvesicles in circulation and have been linked to various pathophysiological complications. Recent research suggests that PMVs carry significant amounts of cargo that can affect cellular functions by influencing calcium oscillations in target cells. As calcium is involved in multiple cellular processes, including hemostasis and thrombosis, this study aimed to investigate the impact of PMVs on platelet calcium mobilization. The study found that PMVs increase platelet intracellular calcium levels via both intracellular storage and extracellular space in a dose-dependent manner. The study highlighted the critical role of the dense tubular system, acidic vacuoles, mitochondrial stores, and store-operated calcium entry (SOCE) in PMV-mediated calcium release in human platelets. Moreover, the study revealed that PMV-induced calcium rise in platelets does not occur via sarcoendoplasmic reticulum calcium ATPase, and extracellular calcium addition further increases the calcium level in platelets, demonstrating the involvement of SOCE. These findings provide insights into the platelet stimulation signaling mechanisms and contributes to our understanding of platelet and cell behavior when exposed to PMV-rich environments.


Asunto(s)
Plaquetas , Calcio , Humanos , Calcio/metabolismo , Plaquetas/metabolismo , Señalización del Calcio
7.
Langmuir ; 38(38): 11764-11769, 2022 09 27.
Artículo en Inglés | MEDLINE | ID: mdl-36037445

RESUMEN

It is hypothesized that nonlinear solid friction between the gel matrix and DNA molecules inhibits the motion of DNA through the nanopores of the gel during electrophoresis. In this article, it is demonstrated that external noise can alleviate the effect of solid friction, thus enhancing the mobility of DNA in an electrophoretic setting. In the presence of noise, the mobility of DNA increases by more than ∼113% compared to conventional electrophoresis. Although at a high power of noise, DNA exhibits Arrhenius kinetics, at a low power of noise, super-Arrhenius kinetics suggests the collective behavior of the activated motion of DNA molecules. A stochastic simulation following modified Langevin dynamics with the asymmetric pore size distribution of the agarose gel successfully predicts the mobility of DNA molecules and reveals the salient features of the overall dynamics. This "noise lubricity" may have a broader applicability from molecular to macroscopic locomotion.


Asunto(s)
Nanoporos , ADN/análisis , Electroforesis en Gel de Agar/métodos , Fricción , Geles , Locomoción , Sefarosa
8.
Curr Microbiol ; 79(6): 168, 2022 Apr 23.
Artículo en Inglés | MEDLINE | ID: mdl-35460380

RESUMEN

Species composition and diversity dynamics of the actinomycetes was studied in five salt basins of arid and semi-arid areas of Rajasthan, India. A novel approach integrating molecular (16S rRNA gene) and diversity indices was applied to reveal species composition and diversity dynamics. Fifty-three actinomycetes isolates were isolated from five arid and semi-arid salt basins. Molecular characterization resulted in the identification of actinomycetes species belonging to three genera namely, Streptomyces, Nocardiopsis, and Actinoalloteichus. The diversity study among actinomycetes species validates their universal occurrence in arid and semi-arid regions of Rajasthan. The species N. dassonvillei subsp. albirubida was omnipresent in all the five salt basins but its relative manifestation was not static across habitats. The study revealed that three species N. chromatogenes, S. durbertensis, and S. mangrovicola are being reported for the first time from India. The maximum species of actinomycetes were recorded from Pachpadra (14) and the minimum from Didwana area (6). This study not only documents the hitherto wealth of actinomycetes species in arid and semi-arid salt basins of Rajasthan but also reveals the composition and diversity dynamics of actinomycetes.


Asunto(s)
Actinobacteria , Actinomyces/genética , Clima Desértico , India , Filogenia , ARN Ribosómico 16S/genética
9.
J Integr Plant Biol ; 64(6): 1135-1139, 2022 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-35377511

RESUMEN

Premature plant senescence induced by abiotic stresses is a major cause of agricultural losses worldwide. Tools for suppressing stress-induced plant senescence are limited. Here, we report that diacetyl, a natural compound emitted by the plant-beneficial bacterium Bacillus amyloliquefaciens, suppresses abscisic acid -mediated foliar senescence in Arabidopsis thaliana under various abiotic stress conditions. Our results establish diacetyl as an effective protector against stress-induced plant senescence and reveal a molecular mechanism for bacteria-enhanced plant stress resistance.


Asunto(s)
Proteínas de Arabidopsis , Arabidopsis , Ácido Abscísico/farmacología , Arabidopsis/metabolismo , Proteínas de Arabidopsis/metabolismo , Bacterias , Diacetil/farmacología , Regulación de la Expresión Génica de las Plantas , Hojas de la Planta/metabolismo , Plantas/metabolismo , Estrés Fisiológico
10.
Childs Nerv Syst ; 36(11): 2741-2748, 2020 11.
Artículo en Inglés | MEDLINE | ID: mdl-32185473

RESUMEN

OBJECTIVE: The authors performed a retrospective review of children diagnosed with multiloculated hydrocephalus (MLH) in our institute. The goal was to analyze the different diagnostic and therapeutic modalities used with special emphasis on CT ventriculography (CTV). METHODS: Male and female patients below the age of 18 years diagnosed with MLH were included. Cases of uniloculated hydrocephalus like entrapped temporal horn or isolated fourth ventricle were excluded. We used iohexol for CTV and gadodiamide for MR ventriculography. Neuroendoscopic procedures performed were endoscopic fenestration, endoscopic third ventriculostomy (ETV), endoscopic septostomy, endoscopic aqueductoplasty, or a combination of the above. The cohort was divided into two groups (endoscopic or shunt) based on initial surgical intervention. RESULTS: A total of 52 patients were included, with 43 boys and 9 girls. The average age of presentation was 7.7 months. The most common predisposing factor for MLH was neonatal meningitis seen in 30 patients. Mean duration of follow-up was 39 months. CTV was used in 26 patients and MR ventriculography in three patients. In one patient, the diagnosis of MLH was ruled out after ventriculography. Patients who underwent ETV only had the best outcome with 71.4% success rate. At the end of follow-up, 14 patients (27%) were shunt independent. CONCLUSIONS: The present study indicates that CTV helps to accurately define the anatomy of the ventricles and determine the site of physiological CSF obstruction. This helps in therapeutic planning and in avoiding misdiagnoses. Further, neuroendoscopy has the potential to lead to shunt independence in some patients.


Asunto(s)
Hidrocefalia , Neuroendoscopía , Tercer Ventrículo , Adolescente , Niño , Femenino , Humanos , Hidrocefalia/diagnóstico por imagen , Hidrocefalia/cirugía , Lactante , Recién Nacido , Masculino , Estudios Retrospectivos , Tercer Ventrículo/diagnóstico por imagen , Tercer Ventrículo/cirugía , Tomografía Computarizada por Rayos X , Resultado del Tratamiento , Ventriculostomía
11.
Plant J ; 95(6): 1069-1083, 2018 09.
Artículo en Inglés | MEDLINE | ID: mdl-29952050

RESUMEN

Cotton fibers are single-celled trichomes that initiate from the epidermal cells of the ovules at or before anthesis. Here, we identified that the histone deacetylase (HDAC) activity is essential for proper cotton fiber initiation. We further identified 15 HDACs homoeologs in each of the A- and D-subgenomes of Gossypium hirsutum. Few of these HDAC homoeologs expressed preferentially during the early stages of fiber development [-1, 0 and 6 days post-anthesis (DPA)]. Among them, GhHDA5 expressed significantly at the time of fiber initiation (-1 and 0 DPA). The in vitro assay for HDAC activity indicated that GhHDA5 primarily deacetylates H3K9 acetylation marks. Moreover, the reduced expression of GhHDA5 also suppresses fiber initiation and lint yield in the RNA interference (RNAi) lines. The 0 DPA ovules of GhHDA5RNAi lines also showed alterations in reactive oxygen species homeostasis and elevated autophagic cell death in the developing fibers. The differentially expressed genes (DEGs) identified through RNA-seq of RNAi line (DEP12) and their pathway analysis showed that GhHDA5 modulates expression of many stress and development-related genes involved in fiber development. The reduced expression of GhHDA5 in the RNAi lines also resulted in H3K9 hyper-acetylation on the promoter region of few DEGs assessed by chromatin immunoprecipitation assay. The positively co-expressed genes with GhHDA5 showed cumulative higher expression during fiber initiation, and gene ontology annotation suggests their involvement in fiber development. Furthermore, the predicted protein interaction network in the positively co-expressed genes indicates HDA5 modulates fiber initiation-specific gene expression through a complex involving reported repressors.


Asunto(s)
Fibra de Algodón , Gossypium/metabolismo , Histona Desacetilasas/fisiología , Histonas/metabolismo , Proteínas de Plantas/fisiología , Diferenciación Celular , Perfilación de la Expresión Génica , Regulación de la Expresión Génica de las Plantas , Gossypium/crecimiento & desarrollo , Gossypium/fisiología , Histona Desacetilasas/metabolismo , Histonas/fisiología , Estrés Oxidativo , Proteínas de Plantas/metabolismo , Interferencia de ARN
12.
Neurol India ; 65(4): 752-758, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-28681745

RESUMEN

CONTEXT: Spontaneous intracerebral haemorrhage (ICH) accounts for 4-14% of all strokes and has a high mortality rate of 30-50% during the first month. Management of large hematomas is controversial, with some advocating medical management while others favoring surgical evacuation. AIM: This study was undertaken to compare the outcome of patients with a spontaneous supratentorial intracerebral hemorrhage (SSICH) managed with or without surgical evacuation. SETTINGS AND DESIGN: Four hundred and eighty-two SSICH patients admitted from September 2013 to August 2015 were evaluated based on the inclusion and exclusion criteria. MATERIALS AND METHODS: Among a total of 61 patients with Glasgow Coma Scale (GCS) of 4-14 and hematoma volume of> 30 ml, 27 were randomized to receive medical management (MM) alone and the remaining 34 were randomized to combined surgical as well as medical management (SM). Primary and secondary outcomes were mortality and dependency at 3 months, respectively. STATISTICAL ANALYSIS USED: Student's t-test and X2 test were used for univariate analysis, and logistic regression analysis was employed for multiple variables. RESULTS: On univariate analysis, mortality was significantly lower in the SM group (n = 21,61.8%) compared to the MM group (n = 23,85.2%) (P = 0.043); however, the groups showed no significant difference in dependency at 3 months. Further subgroup analysis showed that a hematoma volume of 30-60 ml, a deeply located hematoma, associated intraventricular hemorrhage, and a Glasgow Coma Scale (GCS) of 4-8 had a significantly lesser mortality in the SM group (P < 0.05). On multivariate analysis, a significant association was found between the mortality and the treatment arm (P = 0.006). CONCLUSIONS: In patients with SSICH, mortality was found to be significantly associated with the treatment arm and the results were in favour of SM among the patients presenting with GCS 4-8, hematoma volume 31-60 ml, midline shift of more than 5 mm, and intraventricular extension of the hematoma.


Asunto(s)
Hemorragia Cerebral/mortalidad , Hemorragia Cerebral/terapia , Femenino , Humanos , Masculino , Persona de Mediana Edad , Procedimientos Neuroquirúrgicos/mortalidad , Resultado del Tratamiento
13.
J Trop Pediatr ; 61(5): 329-38, 2015 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-26130618

RESUMEN

OBJECTIVES: To document the prevalence of physical, emotional and sexual abuse during childhood among college students. METHODS: The study was conducted among college students of Puducherry, South India. Stratified random sampling was done to select colleges. Data were gathered using the adapted 'Ministry of Women and Child Development Questionnaire on Child Abuse for Young adults'. RESULTS: A total of 936 college students completed the questionnaire. Mean ± SD age of the participants was 19.2 ± 1.1 years. Half (48%) of the participants reported being mocked because of their physical appearance. In all, 56% (524/936) of the participants reported that they were beaten during their childhood, of which 13.4% (70/524) required medical treatment. Around 10% reported someone exposing his/her private parts to them, while in 6.4% of the cases, the perpetrator forced the study participants to expose their private parts. CONCLUSIONS: Emotional, physical and sexual abuse is common in childhood and demands prompt interventions at the familial, community and political levels.


Asunto(s)
Maltrato a los Niños/estadística & datos numéricos , Delitos Sexuales/estadística & datos numéricos , Estudiantes/estadística & datos numéricos , Niño , Maltrato a los Niños/psicología , Estudios Transversales , Femenino , Humanos , India/epidemiología , Masculino , Prevalencia , Delitos Sexuales/psicología , Factores Socioeconómicos , Estudiantes/psicología , Encuestas y Cuestionarios , Universidades , Adulto Joven
14.
Immunology ; 142(3): 453-64, 2014 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-24593842

RESUMEN

Macrophages are among the most sensitive immune cells because of their phagocytic activity and are prone to become dysfunctional or not able to perform properly if nanoparticle load increases. We have previously reported that zinc oxide nanoparticles (ZNPs) induce inflammatory responses in macrophages that contribute to their death. Recognition of ZNPs by pattern recognition receptors such as toll-like receptors (TLRs) might be a factor in the initiation of these responses in macrophages. Therefore, in this study we explored the role played by TLR6 and mitogen-activated protein kinase (MAPKs) pathways in the inflammatory responses of macrophages during ZNPs exposure. ZNPs-activated macrophages showed enhanced expression of activation and maturation markers (CD1d, MHC-II, CD86 and CD71). Among various TLRs screened, TLR6 emerged as the most potent activator for ZNPs-induced inflammatory responses. Downstream signalling proteins myeloid differentiation 88, interleukin-1 receptor associated kinase and tumour necrosis factor receptor-associated factor were also enhanced. On inhibiting MAPKs pathways individually, the inflammatory responses such as interleukin-1ß, interleukin-6, tumour necrosis factor-α, cyclooxygenase-2 and inducible nitric oxide synthase were suppressed. TLR6 silencing significantly inhibited the pro-inflammatory cytokine levels, reactive nitrogen species generation and inducible nitric oxide synthase expression. Also, inhibition of MAPKs in the absence of TLR6 signalling validated the link between TLR6 and MAPKs in ZNPs-induced inflammatory responses. TLR6 was found to be co-localized with autophagosomes. Macrophages lacking TLR6 inhibited the autophagosome marker protein-microtubule-associated protein1 light chain 3-isoform II formation and phagocytosis. These results demonstrate that inflammatory responses caused by ZNPs-activated macrophages strongly depend on TLR6-mediated MAPK signalling.


Asunto(s)
Inflamación/metabolismo , Macrófagos/efectos de los fármacos , Nanopartículas/química , Receptor Toll-Like 6/metabolismo , Óxido de Zinc/farmacología , Animales , Relación Dosis-Respuesta a Droga , Femenino , Macrófagos/metabolismo , Ratones , Ratones Endogámicos BALB C , Proteínas Quinasas Activadas por Mitógenos/antagonistas & inhibidores , Proteínas Quinasas Activadas por Mitógenos/metabolismo , Transducción de Señal/efectos de los fármacos , Relación Estructura-Actividad
15.
Childs Nerv Syst ; 30(5): 851-7, 2014 May.
Artículo en Inglés | MEDLINE | ID: mdl-24493368

RESUMEN

OBJECTIVE: This study aims at generating knowledge to understand the conditions in which either of the two procedures (endoscopic third ventriculostomy (ETV) and shunt) are better options and to develop good practice guidelines for the treatment of tubercular meningitis (TBM) hydrocephalus. METHODS: This study was conducted on 48 patients in pediatric age group (less than or equal to 18 years) of TBM hydrocephalus. The patients were randomized to one of the cerebrospinal fluid diversion procedures (ETV or shunt). The two procedures were compared for their outcome, both radiologically and clinically. RESULTS: Twenty-four cases underwent shunt, out of which 13 (68%) cases were successful. Twelve (70.3%) cases belonged to grade 3, while one case was of grade 1. In ETV group, 10 (42%) cases had a successful outcome, out of which 7 (38.8%) cases were in grade 3, while 1 case each belonged to grades 1, 2, and 4. Incidence of ETV failure was more in younger age group, i.e., <2 years (n = 7), while no such correlation with age was found in shunt cases. CONCLUSION: Though with the present study it looks like that the relative risk of ETV failure is higher than that for shunt, but the risk becomes progressively lower with time. Therefore, if patients survive the early high-risk period, they could experience a long-term survival advantage devoid of life-long shunt-related complications. Though for definitive comparison, a long-term study is needed.


Asunto(s)
Hidrocefalia/cirugía , Tercer Ventrículo/cirugía , Tuberculosis Meníngea/cirugía , Derivación Ventriculoperitoneal/métodos , Ventriculostomía/métodos , Adolescente , Niño , Preescolar , Femenino , Humanos , Hidrocefalia/complicaciones , Lactante , Recién Nacido , Masculino , Índice de Severidad de la Enfermedad , Resultado del Tratamiento , Tuberculosis Meníngea/complicaciones
16.
Sci Total Environ ; 917: 170453, 2024 Mar 20.
Artículo en Inglés | MEDLINE | ID: mdl-38296084

RESUMEN

Municipal Solid Waste (MSW) management is a pressing global concern, with increasing interest in Waste-to-Energy Technologies (WTE-T) to divert waste from landfills. However, WTE-T adoption is hindered by financial uncertainties. The economic benefits of MSW treatment and energy generation must be balanced against environmental impact. Integrating cutting-edge technologies like Artificial Intelligence (AI) can enhance MSW management strategies and facilitate WTE-T adoption. This review paper explores waste classification, generation, and disposal methods, emphasizing public awareness to reduce waste. It discusses AI's role in waste management, including route optimization, waste composition forecasting, and process parameter optimization for energy generation. Various energy production techniques from MSW, such as high-solids anaerobic digestion, torrefaction, plasma pyrolysis, incineration, gasification, biodegradation, and hydrothermal carbonization, are examined for their advantages and challenges. The paper emphasizes risk assessment in MSW management, covering chemical, mechanical, biological, and health-related risks, aiming to identify and mitigate potential adverse effects. Electronic waste (E-waste) impact on human health and the environment is thoroughly discussed, highlighting the release of hazardous substances and their contribution to air, soil, and water pollution. The paper advocates for circular economy (CE) principles and waste-to-energy solutions to achieve sustainable waste management. It also addresses complexities and constraints faced by developing nations and proposes strategies to overcome them. In conclusion, this comprehensive review underscores the importance of risk assessment, the potential of AI and waste-to-energy solutions, and the need for sustainable waste management to safeguard public health and the environment.


Asunto(s)
Eliminación de Residuos , Administración de Residuos , Humanos , Residuos Sólidos/análisis , Eliminación de Residuos/métodos , Inteligencia Artificial , Administración de Residuos/métodos , India , Medición de Riesgo
17.
Carbohydr Res ; 539: 109105, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38583285

RESUMEN

Herein, we report the development of a diastereoselective and efficient route to construct sugar-derived pyrano[3,2-c]quinolones utilizing 1-C-formyl glycal and 4-hydroxy quinolone annulation. This methodology will open a route to synthesize nature inspired pyrano[3,2-c]quinolones. This is the first report for the stereoselective synthesis of sugar-derived pyrano[3,2-c]quinolones, where 100% stereoselectivity was observed. A total of sixteen compounds have been synthesized in excellent yields with 100% stereoselectivity. The molecular docking of the synthesized novel natural product analogues demonstrated their binding modes within the active site of type II topoisomerase. The results of the in-silico studies displayed more negative binding energies for the all the synthesized compounds in comparison to the natural product huajiosimuline A, indicating their affinity for the active pocket. Ten out of the sixteen novel synthesized compounds were found to have comparative or relatively more negative binding energy in comparison to the standard anti-cancer drug, doxorubicin. Additionally, the scalability and viability of this protocol was illustrated by the gram scale synthesis.


Asunto(s)
Productos Biológicos , Simulación del Acoplamiento Molecular , Quinolonas , Productos Biológicos/química , Productos Biológicos/síntesis química , Estereoisomerismo , Quinolonas/química , Quinolonas/síntesis química , ADN-Topoisomerasas de Tipo II/metabolismo , ADN-Topoisomerasas de Tipo II/química
18.
RSC Adv ; 14(2): 902-953, 2024 Jan 02.
Artículo en Inglés | MEDLINE | ID: mdl-38174252

RESUMEN

Thiazolines and their derivatives hold significant importance in the field of medicinal chemistry due to their promising potential as pharmaceutical agents. These molecular entities serve as critical scaffolds within numerous natural products, including curacin A, thiangazole, and mirabazole, and play a vital role in a wide array of physiological reactions. Their pharmacological versatility encompasses anti-HIV, neurological, anti-cancer, and antibiotic activities. Over the course of recent decades, researchers have extensively explored and developed analogs of these compounds, uncovering compelling therapeutic properties such as antioxidant, anti-tumor, anti-microbial, and anti-inflammatory effects. Consequently, thiazoline-based compounds have emerged as noteworthy targets for synthetic endeavors. In this review, we provide a comprehensive summary of recent advancements in the synthesis of thiazolines and thiazoline-based derivatives, along with an exploration of their diverse potential applications across various scientific domains.

19.
Appl Microbiol Biotechnol ; 97(2): 859-69, 2013 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-22382164

RESUMEN

Using natural processes as inspiration, the present study demonstrates a positive correlation between zinc metal tolerance ability of a soil fungus and its potential for the synthesis of zinc oxide (ZnO) nanoparticles. A total of 19 fungal cultures were isolated from the rhizospheric soils of plants naturally growing at a zinc mine area in India and identified on the genus, respectively the species level. Aspergillus aeneus isolate NJP12 has been shown to have a high zinc metal tolerance ability and a potential for extracellular synthesis of ZnO nanoparticles under ambient conditions. UV-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction analysis, transmission electron microscopy, and energy dispersive spectroscopy studies further confirmed the crystallinity, morphology, and composition of synthesized ZnO nanoparticles. The results revealed the synthesis of spherical nanoparticles coated with protein molecules which served as stabilizing agents. Investigations on the role of fungal extracellular proteins in the synthesis of nanoparticles indicated that the process is nonenzymatic but involves amino acids present in the protein chains.


Asunto(s)
Nanopartículas/química , Óxido de Zinc/química , Aspergillus/metabolismo , Biomimética , Rizosfera
20.
Cureus ; 15(8): e44359, 2023 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-37779744

RESUMEN

Artificial intelligence (AI) has transformed pharmacological research through machine learning, deep learning, and natural language processing. These advancements have greatly influenced drug discovery, development, and precision medicine. AI algorithms analyze vast biomedical data identifying potential drug targets, predicting efficacy, and optimizing lead compounds. AI has diverse applications in pharmacological research, including target identification, drug repurposing, virtual screening, de novo drug design, toxicity prediction, and personalized medicine. AI improves patient selection, trial design, and real-time data analysis in clinical trials, leading to enhanced safety and efficacy outcomes. Post-marketing surveillance utilizes AI-based systems to monitor adverse events, detect drug interactions, and support pharmacovigilance efforts. Machine learning models extract patterns from complex datasets, enabling accurate predictions and informed decision-making, thus accelerating drug discovery. Deep learning, specifically convolutional neural networks (CNN), excels in image analysis, aiding biomarker identification and optimizing drug formulation. Natural language processing facilitates the mining and analysis of scientific literature, unlocking valuable insights and information. However, the adoption of AI in pharmacological research raises ethical considerations. Ensuring data privacy and security, addressing algorithm bias and transparency, obtaining informed consent, and maintaining human oversight in decision-making are crucial ethical concerns. The responsible deployment of AI necessitates robust frameworks and regulations. The future of AI in pharmacological research is promising, with integration with emerging technologies like genomics, proteomics, and metabolomics offering the potential for personalized medicine and targeted therapies. Collaboration among academia, industry, and regulatory bodies is essential for the ethical implementation of AI in drug discovery and development. Continuous research and development in AI techniques and comprehensive training programs will empower scientists and healthcare professionals to fully exploit AI's potential, leading to improved patient outcomes and innovative pharmacological interventions.

SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA