Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 85
Filtrar
1.
J Biol Chem ; 300(7): 107439, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38838774

RESUMO

The therapeutic application of CRISPR-Cas9 is limited due to its off-target activity. To have a better understanding of this off-target effect, we focused on its mismatch-prone PAM distal end. The off-target activity of SpCas9 depends directly on the nature of mismatches, which in turn results in deviation of the active site of SpCas9 due to structural instability in the RNA-DNA duplex strand. In order to test the hypothesis, we designed an array of mismatched target sites at the PAM distal end and performed in vitro and cell line-based experiments, which showed a strong correlation for Cas9 activity. We found that target sites having multiple mismatches in the 18th to 15th position upstream of the PAM showed no to little activity. For further mechanistic validation, Molecular Dynamics simulations were performed, which revealed that certain mismatches showed elevated root mean square deviation values that can be attributed to conformational instability within the RNA-DNA duplex. Therefore, for successful prediction of the off-target effect of SpCas9, along with complementation-derived energy, the RNA-DNA duplex stability should be taken into account.


Assuntos
Pareamento Incorreto de Bases , Proteína 9 Associada à CRISPR , Sistemas CRISPR-Cas , Humanos , Proteína 9 Associada à CRISPR/metabolismo , Proteína 9 Associada à CRISPR/genética , Proteína 9 Associada à CRISPR/química , DNA/química , DNA/metabolismo , Simulação de Dinâmica Molecular , RNA/química , RNA/metabolismo , RNA Guia de Sistemas CRISPR-Cas/metabolismo , RNA Guia de Sistemas CRISPR-Cas/química , Células HEK293 , Edição de Genes
2.
Cytometry A ; 105(4): 231-241, 2024 04.
Artigo em Inglês | MEDLINE | ID: mdl-38437027

RESUMO

Plants are sessile creatures that have to adapt constantly changing environmental circumstances. Plants are subjected to a range of abiotic stressors as a result of unpredictable climate change. Understanding how stress-responsive genes are regulated can help us better understand how plants can adapt to changing environmental conditions. Epigenetic markers that dynamically change in response to stimuli, such as DNA methylation and histone modifications are known to regulate gene expression. Individual cells or particles' physical and/or chemical properties can be measured using the method known as flow cytometry. It may therefore be used to evaluate changes in DNA methylation, histone modifications, and other epigenetic markers, making it a potent tool for researching epigenetics in plants. We explore the use of flow cytometry as a technique for examining epigenetic traits in this thorough discussion. The separation of cell nuclei and their subsequent labeling with fluorescent antibodies, offering information on the epigenetic mechanisms in plants when utilizing flow cytometry. We also go through the use of high-throughput data analysis methods to unravel the complex epigenetic processes occurring inside plant systems.


Assuntos
Metilação de DNA , Epigênese Genética , Citometria de Fluxo , Plantas/genética , Plantas/metabolismo , Núcleo Celular/metabolismo
3.
Endocr Regul ; 58(1): 101-104, 2024 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-38656253

RESUMO

Diabetes mellitus type 3 refers to diabetes secondary to an existing disease or condition of the exocrine pancreas and is an uncommon cause of diabetes occurring due to pancreatogenic pathology. It accounts for 15-20% of diabetic patients in Indian and Southeast Asian continents. This is case report of a rare case of type 3 diabetes mellitus (T3DM) presenting with diabetic ketoacidosis (DKA). The patient was admitted for DKA along with complaint of hyperglycemia, blood glucose of 405 mg/dl with HbA1c level of 13.7%. Computed tomography evidence revealed chronic calcific pancreatitis with intraductal calculi and dilated pancreatic duct.


Assuntos
Calcinose , Cálculos , Cetoacidose Diabética , Ductos Pancreáticos , Pancreatite Crônica , Humanos , Cetoacidose Diabética/complicações , Cetoacidose Diabética/diagnóstico , Pancreatite Crônica/complicações , Pancreatite Crônica/diagnóstico , Pancreatite Crônica/diagnóstico por imagem , Cálculos/complicações , Cálculos/diagnóstico por imagem , Cálculos/diagnóstico , Ductos Pancreáticos/patologia , Ductos Pancreáticos/diagnóstico por imagem , Calcinose/etiologia , Calcinose/diagnóstico , Calcinose/complicações , Calcinose/diagnóstico por imagem , Masculino , Adulto , Tomografia Computadorizada por Raios X
4.
J Microencapsul ; 41(7): 519-534, 2024 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-39162289

RESUMO

AIM(S): This article explores the application of mesalazine-loaded nanoparticles (MLZ-NPs) encapsulated in Abelmoschus esculentus plant polysaccharide-based pellets (MLZ-NPs-Pellets) for ulcerative colitis. METHODS: MLZ-NPs were prepared and evaluated for diameter, PDI, and entrapment efficiency. In-vitro efficacy study was conducted on Caco-2 cells. MLZ-NPs were encapsulated in polysaccharides to form MLZ-NPs-Pellets and characterised for efficacy in animals and targeting efficiency in human volunteers. RESULTS: Optimised batch of MLZ-NPs were characterised for diameter, PDI, zeta potential and entrapment efficiency which was found to be 145.42 ± 6.75 nm, 0.214 ± 0.049, -31.63 mV and 77.65 ± 2.33(%w/w) respectively. ROS, superoxide and NF-kß were well controlled in Caco-2 cells when treated with MLZ-NPs. In-vivo data revealed that some parameters (body weight, colon length, lipid peroxidase, and glutathione) recovered significantly in the DSS-induced mice model treated with oral MLZ-NPs-Pellets. Gamma scintigraphy revealed that the formulation can effectively target the colon within 600 min. CONCLUSION: MLZ-NPs-Pellets can be effectively used for microbial-triggered colon targeting approach in treating ulcerative colitis.


Assuntos
Abelmoschus , Colite Ulcerativa , Colo , Mesalamina , Nanopartículas , Polissacarídeos , Abelmoschus/química , Células CACO-2 , Humanos , Animais , Polissacarídeos/química , Polissacarídeos/farmacologia , Nanopartículas/química , Colo/efeitos dos fármacos , Colo/metabolismo , Colite Ulcerativa/tratamento farmacológico , Camundongos , Mesalamina/administração & dosagem , Mesalamina/farmacologia , Masculino , Sulfato de Dextrana , Anti-Inflamatórios não Esteroides/administração & dosagem , Anti-Inflamatórios não Esteroides/farmacologia
5.
J Water Health ; 21(8): 981-994, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37632375

RESUMO

The study estimated the risk due to Cryptosporidium, Giardia, and Ascaris, associated with non-potable water reuse in the city of Jaipur, India. The study first determined the exposure dose of Cryptosporidium, Giardia, and Ascaris based on various wastewater treatment technologies for various scenarios of reuse for six wastewater treatment plants (WWTPs) in the city. The exposure scenarios considered were (1) garden irrigation; (2) working and lounging in the garden; and (3) consumption of crops irrigated with recycled water. The estimated annual risk of infection varied between 8.57 × 10-7 and 1.0 for protozoa and helminths, respectively. The order of treatment processes, in decreasing order of annual risk of infection, was found to be: moving-bed bioreactor (MBBR) technology > activated sludge process (ASP) technology > sequencing batch reactor (SBR) technology. The estimated annual risk was found to be in this order: Ascaris > Giardia > Cryptosporidium. The study also estimated the maximum allowable concentration (Cmax) of pathogen in the effluent for a benchmark value of annual infection of risk equal to 1:10,000, the acceptable level of risk used for drinking water. The estimated Cmax values were found to be 6.54 × 10-5, 1.37 × 10-5, and 2.89 × 10-6 (oo) cysts/mL for Cryptosporidium, Giardia, and Ascaris, respectively.


Assuntos
Criptosporidiose , Cryptosporidium , Água Potável , Giardíase , Helmintos , Animais , Saúde Pública , Biofilmes , Reatores Biológicos , Giardia , Ascaris
6.
Int J Mol Sci ; 24(7)2023 Mar 24.
Artigo em Inglês | MEDLINE | ID: mdl-37047112

RESUMO

Root system architecture (RSA), also known as root morphology, is critical in plant acquisition of soil resources, plant growth, and yield formation. Many QTLs associated with RSA or root traits in maize have been identified using several bi-parental populations, particularly in response to various environmental factors. In the present study, a meta-analysis of QTLs associated with root traits was performed in maize using 917 QTLs retrieved from 43 mapping studies published from 1998 to 2020. A total of 631 QTLs were projected onto a consensus map involving 19,714 markers, which led to the prediction of 68 meta-QTLs (MQTLs). Among these 68 MQTLs, 36 MQTLs were validated with the marker-trait associations available from previous genome-wide association studies for root traits. The use of comparative genomics approaches revealed several gene models conserved among the maize, sorghum, and rice genomes. Among the conserved genomic regions, the ortho-MQTL analysis uncovered 20 maize MQTLs syntenic to 27 rice MQTLs for root traits. Functional analysis of some high-confidence MQTL regions revealed 442 gene models, which were then subjected to in silico expression analysis, yielding 235 gene models with significant expression in various tissues. Furthermore, 16 known genes viz., DXS2, PHT, RTP1, TUA4, YUC3, YUC6, RTCS1, NSA1, EIN2, NHX1, CPPS4, BIGE1, RCP1, SKUS13, YUC5, and AW330564 associated with various root traits were present within or near the MQTL regions. These results could aid in QTL cloning and pyramiding in developing new maize varieties with specific root architecture for proper plant growth and development under optimum and abiotic stress conditions.


Assuntos
Oryza , Zea mays , Mapeamento Cromossômico/métodos , Estudo de Associação Genômica Ampla , Melhoramento Vegetal , Locos de Características Quantitativas , Oryza/genética
7.
Int J Mol Sci ; 23(19)2022 Sep 24.
Artigo em Inglês | MEDLINE | ID: mdl-36232563

RESUMO

The anti-oxidant and anti-inflammatory effect of beta-glucogallin (BGG), a plant-derived natural product, was evaluated in both in vitro and in vivo studies. For the in vitro study, the ability of BGG pre-treatment to quench LPS-induced effects compared to LPS alone in macrophages was investigated. It was found that BGG pre-treatment showed a significant decrease in ROS, NO, superoxide, and pro-inflammatory cytokines (TNF-alpha, IL-4, IL-17, IL-1ß, and IL-6) and increased reduced glutathione coupled with the restoration of mitochondrial membrane potential. Gene profiling and further validation by qPCR showed that BGG pre-treatment downregulated the LPS-induced expression of c-Fos, Fas, MMP-9, iNOS, COX-2, MyD88, TRIF, TRAF6, TRAM, c-JUN, and NF-κB. We observed that BGG pre-treatment reduced nuclear translocation of LPS-activated NF-κB and thus reduced the subsequent expressions of NLRP3 and IL-1ß, indicating the ability of BGG to inhibit inflammasome formation. Molecular docking studies showed that BGG could bind at the active site of TLR4. Finally, in the LPS-driven sepsis mouse model, we showed that pre-treatment with BGG sustained toxic shock, as evident from their 100% survival. Our study clearly showed the therapeutic potential of BGG in toxic shock syndrome.


Assuntos
Produtos Biológicos , Sepse , Proteínas Adaptadoras de Transporte Vesicular/metabolismo , Animais , Anti-Inflamatórios/efeitos adversos , Antioxidantes/farmacologia , Produtos Biológicos/farmacologia , Ciclo-Oxigenase 2/metabolismo , Citocinas/metabolismo , Glutationa/metabolismo , Taninos Hidrolisáveis , Inflamassomos/metabolismo , Interleucina-17/metabolismo , Interleucina-4/metabolismo , Interleucina-6/metabolismo , Lipopolissacarídeos/efeitos adversos , Macrófagos/metabolismo , Metaloproteinase 9 da Matriz/metabolismo , Camundongos , Simulação de Acoplamento Molecular , Fator 88 de Diferenciação Mieloide/metabolismo , NF-kappa B/metabolismo , Proteína 3 que Contém Domínio de Pirina da Família NLR/metabolismo , Espécies Reativas de Oxigênio/metabolismo , Sepse/metabolismo , Superóxidos/metabolismo , Fator 6 Associado a Receptor de TNF/metabolismo , Receptor 4 Toll-Like/metabolismo , Fator de Necrose Tumoral alfa/metabolismo
8.
Molecules ; 27(16)2022 Aug 18.
Artigo em Inglês | MEDLINE | ID: mdl-36014502

RESUMO

Chronic arsenic (As) poisoning is mostly due to subsoil water contaminated with As and its salts. Exposure to As has been found to cause an elevation in reactive oxygen species (ROS), leading to the damage of DNA and proteins, and it also causes immunotoxicity. Treatment regimens are primarily based on chelation therapy and amino acid and vitamin supplementations. Recent studies have established that natural products display effective and progressive relief from arsenicosis without any side effects. ß-glucogallin (BGG), a gallo-tannin natural product, is reported to possess anti-oxidant and anti-inflammatory properties. In the present study, we aim to observe the protective role of BGG against As-induced cytotoxicity, apoptosis, mitochondrial dysfunction, and the underlying mechanisms in RAW 264.7 macrophage cells. We found that BGG alleviates As-induced ROS, apoptosis, and mitochondrial dysfunction in RAW 264.7 macrophage cells. Thus, BGG can be used therapeutically to prevent As-induced toxicity.


Assuntos
Intoxicação por Arsênico , Arsênio , Animais , Apoptose , Arsênio/toxicidade , Intoxicação por Arsênico/metabolismo , Intoxicação por Arsênico/prevenção & controle , Trióxido de Arsênio/farmacologia , Taninos Hidrolisáveis/farmacologia , Camundongos , NF-kappa B/metabolismo , Proteína 3 que Contém Domínio de Pirina da Família NLR/metabolismo , Estresse Oxidativo , Óxidos/toxicidade , Células RAW 264.7 , Espécies Reativas de Oxigênio/metabolismo
9.
Molecules ; 27(23)2022 Nov 25.
Artigo em Inglês | MEDLINE | ID: mdl-36500313

RESUMO

Natural products are being targeted as alternative anticancer agents due to their non-toxic and safe nature. The present study was conducted to explore the in vitro anticancer potential of Justicia adhatoda (J. adhatoda) leaf extract. The methanolic leaf extract was prepared, and the phytochemicals and antioxidant potential were determined by LCMS analysis and DPPH radical scavenging assay, respectively. A docking study performed with five major alkaloidal phytoconstituents showed that they had a good binding affinity towards the active site of NF-κB. Cell viability assay was carried out in five different cell lines, and the extract exhibited the highest cytotoxicity in MCF-7, a breast cancer cell line. Extract-treated cells showed a significant increase in nitric oxide and reactive oxygen species production. Cell cycle analysis showed an arrest in cell growth at the Sub-G0 phase. The extract successfully inhibited cell migration and colony formation and altered mitochondrial membrane potential. The activities of superoxide dismutase and glutathione were also found to decrease in a dose-dependent manner. The percentage of apoptotic cells was found to increase in a dose-dependent manner in MCF-7 cells. The expressions of caspase-3, Bax, and cleaved-PARP were increased in extract-treated cells. An increase in the expression of NF-κB was found in the cytoplasm in extract-treated cells. J. adhatoda leaf extract showed a potential anticancer effect in MCF-7 cells.


Assuntos
Neoplasias da Mama , Justicia , Humanos , Feminino , Justicia/química , Metanol/química , NF-kappa B/farmacologia , Neoplasias da Mama/tratamento farmacológico , Extratos Vegetais/farmacologia , Extratos Vegetais/química , Células MCF-7 , Folhas de Planta , Apoptose
10.
Acta Neurol Scand ; 143(3): 242-247, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33006755

RESUMO

BACKGROUND: The choice of antiepileptic drug (AED) in newly diagnosed neurocysticercosis (NCC) patients with epilepsy continues to be arbitrary. We compared efficacy and side effect profile of levetiracetam (LEV) and carbamazepine (CBZ) for the treatment of seizures in newly diagnosed patients with NCC. PATIENTS AND METHODS: This was an open-labeled randomized comparative monotherapy study including newly diagnosed drug naïve patients of NCC (n = 99) presenting with seizures who were randomized in 1:1 ratio using computed generated numbers. All patients were followed up for at least six months after start of treatment. The primary outcome measure was seizure control over six months following start of AEDs. RESULTS: Fifteen (15.2%) patients [CBZ- 4(8.2%); LEV- 11(22%)] developed recurrence of seizures. A trend (p = 0.09) was found toward better control of seizures in CBZ compared to LEV. Two (4%) patients in LEV group and 17 (34.6%) patients in CBZ group developed drug-related minor side effects (p < 0.0001). Three patients in CBZ group needed discontinuation of therapy due to skin rash. Eleven patients who relapsed while on LEV did not have any recurrence of seizures after switching over to CBZ. Out of 3 patients who relapsed while receiving CBZ and were changed to LEV, two developed seizures during follow-up. CONCLUSION: CBZ and LEV could be used as alternatives in newly diagnosed patients of NCC at the behest of minor side effects in the CBZ group.


Assuntos
Anticonvulsivantes/uso terapêutico , Carbamazepina/uso terapêutico , Epilepsia/tratamento farmacológico , Epilepsia/etiologia , Levetiracetam/uso terapêutico , Neurocisticercose/complicações , Adolescente , Adulto , Criança , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
11.
Molecules ; 25(20)2020 Oct 10.
Artigo em Inglês | MEDLINE | ID: mdl-33050360

RESUMO

The current pandemic, caused by SARS-CoV-2 virus, is a severe challenge for human health and the world economy. There is an urgent need for development of drugs that can manage this pandemic, as it has already infected 19 million people and led to the death of around 711,277 people worldwide. At this time, in-silico studies are providing lots of preliminary data about potential drugs, which can be a great help in further in-vitro and in-vivo studies. Here, we have selected three polyphenolic compounds, mangiferin, glucogallin, and phlorizin. These compounds are isolated from different natural sources but share structural similarities and have been reported for their antiviral activity. The objective of this study is to analyze and predict the anti-protease activity of these compounds on SARS-CoV-2main protease (Mpro) and TMPRSS2 protein. Both the viral protein and the host protein play an important role in the viral life cycle, such as post-translational modification and viral spike protein priming. This study has been performed by molecular docking of the compounds using PyRx with AutoDock Vina on the two aforementioned targets chosen for this study, i.e., SARS-CoV-2 Mpro and TMPRSS2. The compounds showed good binding affinity and are further analyzed by (Molecular dynamic) MD and Molecular Mechanics Poisson-Boltzmann Surface Area MM-PBSA study. The MD-simulation study has predicted that these natural compounds will have a great impact on the stabilization of the binding cavity of the Mpro of SARS-CoV-2. The predicted pharmacokinetic parameters also show that these compounds are expected to have good solubility and absorption properties. Further predictions for these compounds also showed no involvement in drug-drug interaction and no toxicity.


Assuntos
Betacoronavirus/isolamento & purificação , Produtos Biológicos/farmacologia , Infecções por Coronavirus/tratamento farmacológico , Cisteína Endopeptidases/química , Pneumonia Viral/tratamento farmacológico , Polifenóis/farmacologia , Inibidores de Proteases/farmacologia , Serina Endopeptidases/química , Proteínas não Estruturais Virais/química , Antivirais/farmacologia , COVID-19 , Simulação por Computador , Proteases 3C de Coronavírus , Infecções por Coronavirus/virologia , Cisteína Endopeptidases/metabolismo , Humanos , Simulação de Acoplamento Molecular , Pandemias , Pneumonia Viral/virologia , SARS-CoV-2 , Serina Endopeptidases/metabolismo , Proteínas não Estruturais Virais/metabolismo
12.
Molecules ; 25(7)2020 Mar 27.
Artigo em Inglês | MEDLINE | ID: mdl-32230750

RESUMO

To advance the technology of polymer electrolyte membrane fuel cells, material development is at the forefront of research. This is especially true for membrane electrode assembly, where the structuring of its various layers has proven to be directly linked to performance increase. In this study, we investigate the influence of the various ingredients in the cathode catalyst layer, such as ionomer content, catalyst loading and catalyst type, on the oxygen and ion transport using a full parametric analysis. Using two types of catalysts, 40 wt.% Pt/C and 60 wt.% Pt/C with high surface area carbon, the ionomer/carbon content was varied between 0.29-1.67, while varying the Pt loading in the range of 0.05-0.8 mg cm-2. The optimum ionomer content was found to be dependent on the operating point and condition, as well as catalyst loading and type. The data set provided in this work gives a starting point to further understanding of structured catalyst layers.


Assuntos
Carbono/química , Eletroquímica/métodos , Membranas Artificiais , Oxigênio/química , Platina/química , Polímeros/química , Catálise , Eletrodos , Eletrólitos/química , Íons/química , Microscopia Eletrônica de Varredura
13.
Neuroophthalmology ; 42(5): 316-317, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30510591

RESUMO

Lesions of the central nucleus of the third cranial nerve in midbrain leads to bilateral ptosis. We present a case of a 14 year old boy, who was found to have B/L non-correctable ptosis and medial rectus palsy. There was a ring enhancing lesion in the midbrain in contrast MRI which resolved with treatment. The case exemplifies that bilateral ptosis results from the central nucleus involvement of third nerve which has bilateral innervation.

14.
BMC Infect Dis ; 16(1): 748, 2016 Dec 12.
Artigo em Inglês | MEDLINE | ID: mdl-27955629

RESUMO

BACKGROUND: Leptospirosis involves nervous system in around 10-15% of the cases, the commonest presentation being aseptic meningitis. Most of the clinical features of neuroleptospirosis are due to capillary endothelial damage and vasculitis. Ataxia is an extremely uncommon manifestation of Leptospirosis occuring in <5% of cases. CASE PRESENTATION: A 28 year old female from North India presented with a short febrile illness followed by an acute onset cerebellar ataxia, anemia, thrombocytopenia and transaminitis. Leptospira serology showed high titres of IgM (ELISA) and MAT (microscopic agglutination test titre >1:800) . She was treated with intravenous ceftriaxone for 14 days following which she showed marked recovery. CONCLUSION: The clinical features of neuroleptospirosis are varied, most of them resulting from endothelial damage and vasculitis. Immune mediated phenomenon with no structural damage is another possible mechanism leading to cerebellar ataxia. Cerebellar ataxia due to common tropical infections should be ruled out in the appropriate setting, as early institution of treatment can abate neurological morbidity. The case report highlights the importance of identifying a reversible cause of cerebellar ataixa due to a tropical infection, possibly due to a immune mediated phenomenon, and would be of interest to both internists and neurologists.


Assuntos
Ataxia Cerebelar/diagnóstico , Leptospira/isolamento & purificação , Leptospirose/diagnóstico , Adulto , Testes de Aglutinação , Antibacterianos/uso terapêutico , Anticorpos Antibacterianos/sangue , Anticorpos Antibacterianos/imunologia , Encéfalo/diagnóstico por imagem , Ceftriaxona/uso terapêutico , Ataxia Cerebelar/etiologia , Ensaio de Imunoadsorção Enzimática , Feminino , Humanos , Imunoglobulina M/sangue , Leptospira/imunologia , Leptospirose/complicações , Leptospirose/tratamento farmacológico , Leptospirose/microbiologia , Imageamento por Ressonância Magnética
15.
Environ Sci Technol ; 49(20): 12094-104, 2015 Oct 20.
Artigo em Inglês | MEDLINE | ID: mdl-26348257

RESUMO

The ability of Pseudomonas stutzeri strain DCP-Ps1 to drive CaCO3 biomineralization has been investigated in a microfluidic flowcell (i.e., micromodel) that simulates subsurface porous media. Results indicate that CaCO3 precipitation occurs during NO3(-) reduction with a maximum saturation index (SIcalcite) of ∼1.56, but not when NO3(-) was removed, inactive biomass remained, and pH and alkalinity were adjusted to SIcalcite ∼ 1.56. CaCO3 precipitation was promoted by metabolically active cultures of strain DCP-Ps1, which at similar values of SIcalcite, have a more negative surface charge than inactive strain DCP-Ps1. A two-stage NO3(-) reduction (NO3(-) → NO2(-) → N2) pore-scale reactive transport model was used to evaluate denitrification kinetics, which was observed in the micromodel as upper (NO3(-) reduction) and lower (NO2(-) reduction) horizontal zones of biomass growth with CaCO3 precipitation exclusively in the lower zone. Model results are consistent with two biomass growth regions and indicate that precipitation occurred in the lower zone because the largest increase in pH and alkalinity is associated with NO2(-) reduction. CaCO3 precipitates typically occupied the entire vertical depth of pores and impacted porosity, permeability, and flow. This study provides a framework for incorporating microbial activity in biogeochemistry models, which often base biomineralization only on SI (caused by biotic or abiotic reactions) and, thereby, underpredict the extent of this complex process. These results have wide-ranging implications for understanding reactive transport in relevance to groundwater remediation, CO2 sequestration, and enhanced oil recovery.


Assuntos
Carbonato de Cálcio/metabolismo , Modelos Teóricos , Pseudomonas stutzeri/metabolismo , Biomassa , Carbonato de Cálcio/química , Precipitação Química , Desnitrificação , Água Subterrânea , Concentração de Íons de Hidrogênio , Cinética , Minerais/química , Minerais/metabolismo , Nitratos/química , Nitratos/metabolismo , Permeabilidade , Porosidade
16.
Environ Sci Technol ; 49(7): 4543-50, 2015 Apr 07.
Artigo em Inglês | MEDLINE | ID: mdl-25734534

RESUMO

It is widely understood that selenite can be biologically reduced to elemental selenium. Limited studies have shown that selenite can also be immobilized through abiotic precipitation with sulfide, a product of biological sulfate reduction. We demonstrate that both pathways significantly contribute to selenite immobilization in a microfluidic flow cell having a transverse mixing zone between propionate and selenite that mimics the reaction zone along the margins of a selenite plume undergoing bioremediation in the presence of background sulfate. The experiment showed that red particles of amorphous elemental selenium precipitate on the selenite-rich side of the mixing zone, while long crystals of selenium sulfides precipitate on the propionate-rich side of the mixing zone. We developed a continuum-scale reactive transport model that includes both pathways. The simulated results are consistent with the experimental results, and indicate that spatial segregation of the two selenium precipitates is due to the segregation of the more thermodynamic favorable selenite reduction and the less thermodynamically favorable sulfate reduction. The improved understanding of selenite immobilization and the improved model can help to better design in situ bioremediation processes for groundwater contaminated by selenite or other contaminants (e.g., uranium(IV)) that can be immobilized via similar pathways.


Assuntos
Bactérias/metabolismo , Recuperação e Remediação Ambiental/métodos , Água Subterrânea/análise , Ácido Selenioso/metabolismo , Biodegradação Ambiental , Modelos Teóricos , Selênio/metabolismo , Compostos de Selênio/metabolismo
17.
Proteomics Clin Appl ; : e202400048, 2024 Oct 30.
Artigo em Inglês | MEDLINE | ID: mdl-39474988

RESUMO

Liquid chromatography, when used in conjunction with mass spectrometry (LC/MS), is a powerful tool for conducting accurate and reproducible investigations of numerous metabolites in natural products (NPs). LC/MS has gained prominence in metabolomic research due to its high throughput, the availability of multiple ionization techniques and its ability to provide comprehensive metabolite coverage. This unique method can significantly influence various scientific domains. This review offers a comprehensive overview of the current state of LC/MS-based metabolomics in the investigation of NPs. This review provides a thorough overview of the state of the art in LC/MS-based metabolomics for the investigation of NPs. It covers the principles of LC/MS, various aspects of LC/MS-based metabolomics such as sample preparation, LC modes, method development, ionization techniques and data pre-processing. Moreover, it presents the applications of LC/MS-based metabolomics in numerous fields of NPs research such as including biomarker discovery, the agricultural research, food analysis, the study of marine NPs and microbiological research. Additionally, this review discusses the challenges and limitations of LC/MS-based metabolomics, as well as emerging trends and developments in this field.

18.
J Biophotonics ; 17(3): e202300423, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38010848

RESUMO

Flow cytometry is a potent method that enables the quick and concurrent investigation of several characteristics of single cells in solution. Photodiodes or photomultiplier tubes are employed to detect the dispersed and fluorescent light signals that are produced by the laser beam as it passes through the cells. Photodetectors transform the light signals produced by the laser into electrical impulses. A computer then analyses these electrical impulses to identify and measure the various cell populations depending on their fluorescence or light scattering characteristics. Based on their fluorescence or light scattering properties, cell populations can be examined and/or isolated. This review covers the basic principle, components, working and specific biological applications of flow cytometry, including studies on plant, cell and molecular biology and methods employed for data processing and interpretation as well as the potential future relevance of this methodology in light of retrospective analysis and recent advancements in flow cytometry.


Assuntos
Disciplinas das Ciências Biológicas , Corantes , Citometria de Fluxo , Estudos Retrospectivos
19.
Eur J Med Chem ; 266: 116139, 2024 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-38252989

RESUMO

Diabetes is one of the fastest-growing metabolic disorders, nearly doubling the number of patients each year. There are different treatment approaches available for the management of diabetes, which lacks due to their side effects. The inhibition of enzymes involved in the metabolism of complex polysaccharides to monosaccharides has proven beneficial in patients with type 2 diabetes mellitus. Two enzymes, α-amylase and α-glucosidase, have emerged as potential drug targets and are widely explored for drug development against type 2 diabetes mellitus. In this context, thiazolidine-2,4-diones (TZDs) have emerged as potential drug candidates for developing newer molecules against α-amylase and α-glucosidase. Nineteen TZD-hybrids were synthesized and evaluated in vitro α-amylase and α-glucosidase inhibitory activity. The compounds 7i, 7k, and 7p have emerged as the best dual inhibitors with IC50 of 10.33 ± 0.11-20.94 ± 0.76 µM and 10.19 ± 0.25-24.07 ± 1.56 µM against α-glucosidase and α-amylase, respectively. The derivatives had good anti-oxidant activity, displaying IC50 = 14.95 ± 0.65-23.27 ± 0.99 µM. The compounds 7k and 7p showed the best inhibition of reactive oxygen species in the PNAC-1 cells. The molecules exhibit good binding within the active site of α-amylase (PDB id: 1B2Y) and α-glucosidase (PDB id: 3W37), displaying binding energies of -7.5 to -10.7 kcal/mol and -7.4 to -10.3 kcal/mol, respectively. Further, the compounds were nontoxic (LD50 = 500-1311 mg/kg) and possessed good GI absorption. The compounds 7i, 7k, and 7p were evaluated in vivo antidiabetic activity in an STZ-induced diabetic model in Wistar rats. The compound 7p emerged as the best compound in the in vivo studies; however, the activity was lesser than that of the standard drug pioglitazone.


Assuntos
Diabetes Mellitus Tipo 2 , Hipoglicemiantes , Tiazolidinedionas , Humanos , Ratos , Animais , Hipoglicemiantes/uso terapêutico , Diabetes Mellitus Tipo 2/tratamento farmacológico , Diabetes Mellitus Tipo 2/metabolismo , Tiazolidinas/uso terapêutico , alfa-Glucosidases/metabolismo , Simulação de Acoplamento Molecular , Ratos Wistar , alfa-Amilases , Inibidores de Glicosídeo Hidrolases/química
20.
RSC Med Chem ; 15(8): 2826-2854, 2024 Aug 14.
Artigo em Inglês | MEDLINE | ID: mdl-39149094

RESUMO

Twelve 3,5-disubstituted-thiazolidine-2,4-dione (TZD) hybrids were synthesized using solution phase chemistry. Continuing our previous work, nine O-modified ethyl vanillin (8a-i) derivatives were synthesized and reacted with the TZD core via Knoevenagel condensation under primary reaction conditions to obtain final derivatives 9a-i. Additionally, three isatin-TZD hybrids (11a-c) were synthesized. The intermediates and final derivatives were characterized using 1H and 13C NMR spectroscopy, and the observed chemical shifts agreed with the proposed structures. The in vitro alpha-amylase and alpha-glucosidase inhibitory evaluation of newly synthesized derivatives revealed compounds 9F and 9G as the best dual inhibitors, with IC50 values of 9.8 ± 0.047 µM for alpha-glucosidase (9F) and 5.15 ± 0.0017 µM for alpha-glucosidase (9G), 17.10 ± 0.015 µM for alpha-amylase (9F), and 9.2 ± 0.092 µM for alpha-amylase (9G). The docking analysis of synthesized compounds indicated that compounds have a higher binding affinity for alpha-glucosidase as compared to alpha-amylase, as seen from docking scores ranging from -1.202 to -5.467 (for alpha-amylase) and -4.373 to -7.300 (for alpha-glucosidase). Further, the molecules possess a high LD50 value, typically ranging from 1000 to 1600 mg kg-1 of body weight, and exhibit non-toxic properties. The in vitro cytotoxicity assay results on PANC-1 and INS-1 cells demonstrated that the compounds were devoid of significant toxicity against the tested cells. Compounds 9F and 9G showed high oral absorption, i.e., oral absorption >96%, and their molecular dynamics simulation yielded results closely aligned with the observed docking outcomes. Finally, compounds 9F and 9G were evaluated for in vivo antidiabetic assessment by the induction of diabetes in Wistar rats using streptozotocin. Molecule 9G has been identified as the most effective anti-diabetic molecule due to its ability to modulate several biochemical markers in blood plasma and tissue homogenates. The results were further confirmed by histology investigations conducted on isolated pancreas, liver, and kidney.

SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA