Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 62
Filtrar
Más filtros

Banco de datos
País/Región como asunto
Tipo del documento
Intervalo de año de publicación
1.
J Basic Microbiol ; 63(7): 690-708, 2023 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-36998101

RESUMEN

Medicinal plants are an important source of bioactive compounds and have been used to isolate various bioactive compounds having industrial applications. The demand for plants derived bioactive molecules is increasing gradually. However, the extensive use of these plants to extract bioactive molecules has threatened many plant species. Moreover, extracting bioactive molecules from these plants is laborious, costly, and time-consuming. So, some alternative sources and strategies are urgently needed to produce these bioactive molecules similar to that of plant origin. However, the interest in new bioactive molecules has recently shifted from plants to endophytic fungi because many fungi produce bioactive molecules similar to their host plant. Endophytic fungi live in mutualistic association within the healthy plant tissue without causing disease symptoms to the host plant. These fungi are a treasure house of novel bioactive molecules having broad pharmaceutical, industrial, and agricultural applications. The rapid increase in publications in this domain over the last three decades proves that natural product biologists and chemists are paying great attention to the natural bioactive products from endophytic fungi. Though endophytes are source of novel bioactive molecules but there is need of advanced technologies like clustered regularly interspaced short palindromic repeats and CRISPR-associated protein 9 (CRISPR-Cas9) and epigenetic modifiers to enhance the production of compounds having industrial applications. This review provides an overview of the various industrial applications of bioactive molecules produced by endophytic fungi and the rationale behind selecting specific plants for fungal endophyte isolation. Overall, this study presents the current state of knowledge and highlights the potential of endophytic fungi for developing alternative therapies for drug-resistant infections.


Asunto(s)
Antiinfecciosos , Productos Biológicos , Endófitos/metabolismo , Hongos/metabolismo , Plantas/microbiología , Simbiosis , Antiinfecciosos/metabolismo , Industria Farmacéutica , Productos Biológicos/metabolismo
2.
Biochem J ; 478(9): 1795-1808, 2021 05 14.
Artículo en Inglés | MEDLINE | ID: mdl-33821889

RESUMEN

To inculcate biocatalytic activity in the oxygen-storage protein myoglobin (Mb), a genetically engineered myoglobin mutant H64DOPA (DOPA = L-3,4-dihydroxyphenylalanine) has been created. Incorporation of unnatural amino acids has already demonstrated their ability to accomplish many non-natural functions in proteins efficiently. Herein, the presence of redox-active DOPA residue in the active site of mutant Mb presumably stabilizes the compound I in the catalytic oxidation process by participating in an additional hydrogen bonding (H-bonding) as compared to the WT Mb. Specifically, a general acid-base catalytic pathway was achieved due to the availability of the hydroxyl moieties of DOPA. The reduction potential values of WT (E° = -260 mV) and mutant Mb (E° = -300 mV), w.r.t. Ag/AgCl reference electrode, in the presence of hydrogen peroxide, indicated an additional H-bonding in the mutant protein, which is responsible for the peroxidase activity of the mutant Mb. We observed that in the presence of 5 mM H2O2, H64DOPA Mb oxidizes thioanisole and benzaldehyde with a 10 and 54 folds higher rate, respectively, as opposed to WT Mb. Based on spectroscopic, kinetic, and electrochemical studies, we deduce that DOPA residue, when present within the distal pocket of mutant Mb, alone serves the role of His/Arg-pair of peroxidases.


Asunto(s)
Dihidroxifenilalanina/metabolismo , Hemo/química , Histidina/metabolismo , Hierro/química , Mioglobina/metabolismo , Sustitución de Aminoácidos , Biocatálisis , Dominio Catalítico , Clonación Molecular , Dihidroxifenilalanina/genética , Escherichia coli/genética , Escherichia coli/metabolismo , Expresión Génica , Vectores Genéticos/química , Vectores Genéticos/metabolismo , Hemo/metabolismo , Histidina/genética , Humanos , Enlace de Hidrógeno , Peróxido de Hidrógeno/química , Peróxido de Hidrógeno/metabolismo , Hierro/metabolismo , Cinética , Modelos Moleculares , Mioglobina/química , Mioglobina/genética , Oxidación-Reducción , Peroxidasas/química , Peroxidasas/metabolismo , Unión Proteica , Conformación Proteica , Ingeniería de Proteínas/métodos , Proteínas Recombinantes/química , Proteínas Recombinantes/genética , Proteínas Recombinantes/metabolismo
3.
Biotechnol Appl Biochem ; 67(4): 619-647, 2020 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31954377

RESUMEN

l-Asparaginase (E.C.3.5.1.1.) is a vital enzyme that hydrolyzes l-asparagine to l-aspartic acid and ammonia. This property of l-asparaginase inhibits the protein synthesis in cancer cells, making l-asparaginase a mainstay of pediatric chemotherapy practices to treat acute lymphoblastic leukemia (ALL) patients. l-Asparaginase is also recognized as one of the important food processing agent. The removal of asparagine by l-asparaginase leads to the reduction of acrylamide formation in fried food items. l-Asparaginase is produced by various organisms including animals, plants, and microorganisms, however, only microorganisms that produce a substantial amount of this enzyme are of commercial significance. The commercial l-asparaginase for healthcare applications is chiefly derived from Escherichia coli and Erwinia chrysanthemi. A high rate of hypersensitivity and adverse reactions limits the long-term clinical use of l-asparaginase. Present review provides thorough information on microbial l-asparaginase bioprocess optimization including submerged fermentation and solid-state fermentation for l-asparaginase production, downstream purification, its characterization, and issues related to the clinical application including toxicity and hypersensitivity. Here, we have highlighted the bioprocess techniques that can produce improved and economically viable yields of l-asparaginase from promising microbial sources in the current scenario where there is an urgent need for alternate l-asparaginase with less adverse effects.


Asunto(s)
Asparaginasa , Dickeya chrysanthemi/enzimología , Proteínas de Escherichia coli , Escherichia coli/enzimología , Leucemia-Linfoma Linfoblástico de Células Precursoras/tratamiento farmacológico , Animales , Asparaginasa/efectos adversos , Asparaginasa/biosíntesis , Asparaginasa/aislamiento & purificación , Asparaginasa/uso terapéutico , Proteínas de Escherichia coli/efectos adversos , Proteínas de Escherichia coli/biosíntesis , Proteínas de Escherichia coli/aislamiento & purificación , Proteínas de Escherichia coli/uso terapéutico , Humanos
4.
Biologicals ; 65: 33-38, 2020 May.
Artículo en Inglés | MEDLINE | ID: mdl-32151397

RESUMEN

The assay of Anti T lymphocyte immunoglobulin for final drug product testing is carried out using flow cytometry on Peripheral Blood Mononuclear Cells (PBMCs) as specified in European and British Pharmacopeia. An alternate assay was developed wherein the potency based quality control evaluation of Anti T lymphocyte immunoglobulin is carried out by measuring complement dependent cytotoxicity (CDC) using fluorescent resazurin dye. The reported bioassay was specific, linear (R2 = 0.98), precise (%GCV for repeatability was 3.54% and intermediate precision was 4.27%) and accurate with relative bias of -5.54%. On the basis of results obtained from the repeated performances on single available product, system suitability criteria and sample acceptance criteria were proposed wherein Slope from 4 PL curve fit results for Reference Standard (RS) should be > 0.9, EC50 for RS should lie between 0.264 and 1.131 µg/ml and fold response should be > 2. Confidence interval range and estimated relative potency range obtained from the method validation were narrower than those mentioned for compendial method.


Asunto(s)
Suero Antilinfocítico , Productos Biológicos/normas , Pruebas Inmunológicas de Citotoxicidad/métodos , Linfocitos T , Citometría de Flujo , Colorantes Fluorescentes , Humanos , Control de Calidad
5.
Int J Mol Sci ; 21(18)2020 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-32942668

RESUMEN

Extracellular vesicles (EVs) are a broad, heterogeneous class of membranous lipid-bilayer vesicles that facilitate intercellular communication throughout the body. As important carriers of various types of cargo, including proteins, lipids, DNA fragments, and a variety of small noncoding RNAs, including miRNAs, mRNAs, and siRNAs, EVs may play an important role in the development of addiction and other neurological pathologies, particularly those related to HIV. In this review, we summarize the findings of EV studies in the context of methamphetamine (METH), cocaine, nicotine, opioid, and alcohol use disorders, highlighting important EV cargoes that may contribute to addiction. Additionally, as HIV and substance abuse are often comorbid, we discuss the potential role of EVs in the intersection of substance abuse and HIV. Taken together, the studies presented in this comprehensive review shed light on the potential role of EVs in the exacerbation of substance use and HIV. As a subject of growing interest, EVs may continue to provide information about mechanisms and pathogenesis in substance use disorders and CNS pathologies, perhaps allowing for exploration into potential therapeutic options.


Asunto(s)
Vesículas Extracelulares/metabolismo , Infecciones por VIH/metabolismo , Enfermedades del Sistema Nervioso/metabolismo , Trastornos Relacionados con Sustancias/metabolismo , Animales , Humanos
6.
Arch Biochem Biophys ; 639: 44-51, 2018 02 01.
Artículo en Inglés | MEDLINE | ID: mdl-29277370

RESUMEN

This study showcases the potential of unnatural amino acids to enable non-natural functions when incorporated in the protein scaffold of heme metalloproteins. For this purpose, a genetically-engineered myoglobin (Mb) mutant was created by incorporating redox-active 3-amino-l-tyrosine (NH2Tyr) into its active site, replacing the distal histidine (H64) with NH2Tyr. In peroxide-shunt assays, this variant exhibits an increased rate of turnover for thioanisole and benzaldehyde oxidation as compared to the wild-type (WT) Mb. Indeed, in the presence of excess hydrogen peroxide (H2O2), a 9-fold and 81-fold increase in activity was observed over multiple turnovers for thioanisole sulfoxidation and benzoic acid formation, respectively. The increased oxidation activity in the H64NH2Tyr Mb mutant underlined the role of NH2Tyr in the distal active-site scaffold in peroxide activation. Kinetic, electrochemical, and EPR spectroscopic experiments were performed. On the basis of these studies, it is argued that the single NH2Tyr residue within the Mb variant simultaneously serves the role of the conserved His/Arg-pair within the distal pocket of horseradish peroxidase.


Asunto(s)
Sustitución de Aminoácidos , Ácido Benzoico/química , Mioglobina/química , Sulfuros/química , Animales , Mutación Missense , Mioglobina/genética , Oxidación-Reducción , Cachalote
7.
Mol Genet Genomics ; 292(5): 935-953, 2017 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-28447195

RESUMEN

Estrus or sexual receptivity determination is utmost important for efficient breeding programs for female buffaloes. Prominent estrus behavioral symptoms are the result of several molecular and neuroendocrine events involving the ovary and the brain. Expression of estrus behavior is poor in buffaloes during the summer season. Hence, the discovery of biomarkers specific to the estrus stage or its related ovarian events, like the presence of dominant ovarian follicle, is helpful for developing an easy estrus determination method. MicroRNA are small non-coding RNA with a potential to be biomarkers. Therefore, the present study targeted to investigate the potential of estrogen responsive miRNAs (miR-24, miR-200c, miR-16, miR-191, miR-223 and miR-203) as estrus biomarkers in buffalo saliva, a non-invasive fluid representing animals' pathophysiology. There was a significant (P < 0.05) increase in the salivary presence of the miR-16, miR-191 and miR-223 at 6th and 18th-19th days than the 0 day (estrus), 10th day and the following consecutive estrus day. These observations may indicate an association between the representative lower presence of these miRNA in saliva and the presence of dominant ovarian follicles. To test this association, pathway analysis, target gene identification, functional annotation and protein-protein interaction networks (PPI) were performed for miR-16, miR-191 and miR-223 by different bioinformatics tools. Interestingly, the top pathways (fatty acid biosynthesis and oocyte meiosis), target genes (FGF, BDNF and IGF1) and PPI hub genes (KRAS, BCL2 and IGF1) of these miRNAs were found essential for ovarian follicular dominance. In conclusion, the miR-16, miR-191 and miR-223 may not be the perfect estrus stage-specific biomarkers. However, their lower presence in saliva at estrus and 9th-10th day of estrous cycles, when the ovary usually has a dominant follicle in buffaloes, may intuitively indicate the follicular dominance. Further studies are needed to prove this association in a large population.


Asunto(s)
Búfalos/fisiología , Estro/fisiología , MicroARNs/análisis , Folículo Ovárico/fisiología , Saliva/química , Animales , Secuencia de Bases , Biomarcadores/análisis , Biomarcadores/metabolismo , Estrógenos/metabolismo , Estro/genética , Detección del Estro/métodos , Femenino , MicroARNs/metabolismo , Conducta Sexual Animal/fisiología
9.
Artículo en Inglés | MEDLINE | ID: mdl-39354771

RESUMEN

The Earth's climate is influenced by both natural phenomena (solar fluctuations, oceanic patterns, volcanic eruptions, and tectonic movements) and human activities (deforestation, CO and CO2 emissions, and desertification), all of which contribute to ongoing climate change and the resulting global warming. However, human actions are a major factor in exacerbating global warming and amplifying its adverse impacts worldwide. . With rising temperatures, water evaporation from water bodies and soils intensifies, leading to heightened water scarcity, particularly in drought-prone regions. This scarcity compounds rainfall deficits, posing significant challenges. Precipitation, essential for the biosphere's hydrological cycle, replenishes much of the world's freshwater. It occurs when condensed water vapor in the atmosphere falls back to Earth as rain, drizzle, sleet, graupel, hail, or snow due to gravity. Literature highlights the indispensable role of bacterial populations in this process, termed bio-precipitation. This phenomenon begins with bacterial colonization on plant surfaces, with colonies subsequently dispersed into the atmosphere by winds, triggering ice crystal formation. Through their ice nucleating property, these bacteria facilitate the growth of larger ice crystals, which eventually melt and precipitate as rain or snow. This mechanism aids in nutrient transfer from clouds to soil or vegetation. Pseudomonas syringae stands out as the most notable microorganism exhibiting this ice-nucleation property, serving as the primary source of ice nucleators driving bio-precipitation. Despite limited literature on "rain and snow-causing bacteria," this review comprehensively explores the conceptual background of bio-precipitation, the involved bioprocesses, and the critical role of bacteria like P. syringae, offering insights into future research directions.

10.
Funct Plant Biol ; 51(1): NULL, 2024 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-37743054

RESUMEN

The co-occurrence of salinisation and alkalisation is quite frequent in problematic soils and poses an immediate threat to food, feed and nutritional security. In the present study, root system architectural traits (RSAs) and ion profiling were evaluated in 21 genotypes of Avena species to understand the effect of salinity-alkalinity stress. The oat genotypes were grown on germination paper and 5-day-old seedlings were transferred to a hydroponic system for up to 30days. These seedlings were subjected to seven treatments: T0 , treatment control (Hoagland solution); T1 , moderate salinity (50mM); T2 , high salinity (100mM); T3 , moderate alkalinity (15mM); T4 , high alkalinity (30mM); T5 , combined moderate salinity-alkalinity (50mM+15mM); and T6 , combined high salinity-alkalinity (100mM and 30mM) by using NaCl+Na2 SO4 (saline) and NaHCO3 +Na2 CO3 (alkaline) salts equivalently. The root traits, such as total root area (TRA), total root length (TRL), total root diameter (TRD), total root volume (TRV), root tips (RT), root segments (RS), root fork (RF) and root biomass (RB) were found to be statistically significant (P + and K+ content analysis in root and shoot tissues revealed the ion homeostasis capacity of different Avena accessions under stress treatments. Principal component analysis (PCA) covered almost 83.0% of genetic variation and revealed that the sharing of TRA, RT, RS and RF traits was significantly high. Biplot analysis showed a highly significant correlation matrix (P <0.01) between the pairs of RT and RS, TRL and RS, and RT and RF. Based on PCA ranking and relative value for stress tolerance, IG-20-1183, IG-20-894, IG-20-718 and IG-20-425 expressed tolerance to salinity (T2), IG-20-425 (alkalinity; T4) and IG-20-1183, IG-20-894 and IG-20-1004 were tolerant to salt-alkali treatment (T6). Multi-trait stability index (MTSI) analysis identified three stable oat genotypes (IG-20-714, IG-20-894 and IG-20-425) under multiple environments and these lines can be used in salinity-alkalinity affected areas after yield trials or as donor lines for combined stresses in future breeding programs.


Asunto(s)
Avena , Cloruro de Sodio , Cloruro de Sodio/farmacología , Álcalis/farmacología , Estrés Fisiológico/genética , Fitomejoramiento , Plantones , Cloruro de Sodio Dietético/farmacología
11.
Heliyon ; 10(15): e35735, 2024 Aug 15.
Artículo en Inglés | MEDLINE | ID: mdl-39170533

RESUMEN

Egyptian clover/Berseem (Trifolium alexandrinum L.) is the most popular winter leguminous multi-cut fodder crop widely cultivated in the northwest and central parts of India. Quality seed significantly impacts farm productivity, farmers' profitability, and socioeconomic welfare. Foundation and certified seeds enable high-quality seed production, making breeder seed (BS) the most important link in the seed supply chain. In India, berseem BS indent had increased from 1998 - 99 to 2012-13; afterwards, it followed a constant but decreasing trend. Of the 27 notified cultivars, 24 came into the seed supply chain between 1998-1999 and 2021-2022, indicating high varietal availability to stakeholders. The study examines the potential causes of the national decline in BS indent and production and the differences in these figures over time. The highest BS indent was received for the variety JB-1 (276.1 q), followed by BL-10 (205.1 q), Mescavi (165.6 q) and Wardan (153.7 q) from 1998 - 99 to 2021-22. The varietal replacement rate (VRR) is high, 43.30 %, for the varieties that have reached the age of five or less in the recent three years (2019-20 to 2021-22). Additionally, it has been calculated that if the seed chain operates at 100 % efficiency, the BS generated (48.1q) in 2021-22 can cover an area of almost 0.12 million hectares in 2024-25. The study offers an in-depth overview of berseem BS indent and production, an analysis of the difficulties encountered in BS production, and future directions for expanding variety and producing excess BS in the nation.

12.
Elife ; 132024 Apr 15.
Artículo en Inglés | MEDLINE | ID: mdl-38619110

RESUMEN

A productive HIV-1 infection in humans is often established by transmission and propagation of a single transmitted/founder (T/F) virus, which then evolves into a complex mixture of variants during the lifetime of infection. An effective HIV-1 vaccine should elicit broad immune responses in order to block the entry of diverse T/F viruses. Currently, no such vaccine exists. An in-depth study of escape variants emerging under host immune pressure during very early stages of infection might provide insights into such a HIV-1 vaccine design. Here, in a rare longitudinal study involving HIV-1 infected individuals just days after infection in the absence of antiretroviral therapy, we discovered a remarkable genetic shift that resulted in near complete disappearance of the original T/F virus and appearance of a variant with H173Y mutation in the variable V2 domain of the HIV-1 envelope protein. This coincided with the disappearance of the first wave of strictly H173-specific antibodies and emergence of a second wave of Y173-specific antibodies with increased breadth. Structural analyses indicated conformational dynamism of the envelope protein which likely allowed selection of escape variants with a conformational switch in the V2 domain from an α-helix (H173) to a ß-strand (Y173) and induction of broadly reactive antibody responses. This differential breadth due to a single mutational change was also recapitulated in a mouse model. Rationally designed combinatorial libraries containing 54 conformational variants of V2 domain around position 173 further demonstrated increased breadth of antibody responses elicited to diverse HIV-1 envelope proteins. These results offer new insights into designing broadly effective HIV-1 vaccines.


Asunto(s)
Vacunas contra el SIDA , Dermatitis , VIH-1 , Animales , Ratones , Humanos , VIH-1/genética , Formación de Anticuerpos , Estudios Longitudinales , Vacunas contra el SIDA/genética , Anticuerpos , Antígenos Virales
13.
Appl Microbiol Biotechnol ; 97(12): 5293-301, 2013 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-23579729

RESUMEN

Alkyl-glucosides and alkyl-polyglucosides are the new-generation biodegradable surfactants with good emulsifying and wetting properties. The α-forms of these glucosides occur in antibiotics and also stimulate nasal absorption of many drugs. In this paper, we report the synthesis of hexyl α-glucoside and α-polyglucosides using cell-bound α-glucosidase activity of a novel strain of Microbacterium paraoxydans. A number of cell-bound glycosyl hydrolase activities were detected in the isolate with the maximum hydrolytic activity of 180 IU g(-1) dry wt cells on p-nitrophenyl-α-D-glucopyranoside. In a micro-aqueous system, at a water activity of 0.69, 1.8 g l(-1) of hexyl α-glucoside (corresponding to about 25 % yield) was synthesized by whole cells with maltose and hexanol as substrates. The concentration was enhanced to 11 g l(-1) (~60 % yield) in a biphasic system at a water content of 60 %. (1)H and (13)C NMR spectra of the purified compound confirmed the synthesized product to be hexyl-α-D-glucopyranoside, while the presence of hexyl di- and tri-glucosides was confirmed by electrospray ionization mass spectrometry. The cell-driven synthesis makes this an extremely attractive alternative for synthesis of such compounds.


Asunto(s)
Actinomycetales/enzimología , Actinomycetales/metabolismo , Enzimas Inmovilizadas/metabolismo , Glucósidos/metabolismo , alfa-Glucosidasas/metabolismo , Actinomycetales/clasificación , Actinomycetales/aislamiento & purificación , Análisis por Conglomerados , ADN Bacteriano/química , ADN Bacteriano/genética , ADN Ribosómico/química , ADN Ribosómico/genética , Glucósidos/química , Hexanoles/metabolismo , Espectroscopía de Resonancia Magnética , Maltosa/metabolismo , Espectrometría de Masas , Datos de Secuencia Molecular , Filogenia , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN
14.
Int J Biol Macromol ; 253(Pt 3): 126803, 2023 Dec 31.
Artículo en Inglés | MEDLINE | ID: mdl-37689286

RESUMEN

The present study reports the structural and functional characterization of a new glutaminase-free recombinant L-asparaginase (PrASNase) from Pseudomonas resinovorans IGS-131. PrASNase showed substrate specificity to L-asparagine, and its kinetic parameters, Km, Vmax, and kcat were 9.49 × 10-3 M, 25.13 IUmL-1 min-1, and 3.01 × 103 s-1, respectively. The CD spectra showed that PrASNase consisted of 18.5 % helix, 21.5 % antiparallel sheets, 4.2 % parallel sheets, 14 % turns, and rest other structures. FTIR was used for the functional characterization, and molecular docking predicted that the substrate interacts with serine, alanine, and glutamine in the binding pocket of PrASNase. Differing from known asparaginases, structural characterization by small-angle X-ray scattering (SAXS) and analytical ultracentrifugation (AUC) unambiguously revealed PrASNase to exist as a monomer in solution at low temperatures and oligomerized to a higher state with temperature rise. Through SAXS studies and enzyme assay, PrASNase was found to be mostly monomer and catalytically active at 37 °C. Furthermore, this glutaminase-free PrASNase showed killing effects against WIL2-S and TF-1.28 cells with IC50 of 7.4 µg.mL-1 and 5.6 µg.mL-1, respectively. This is probably the first report with significant findings of fully active L-asparaginase in monomeric form using SAXS and AUC and demonstrated the potential of PrASNase in inhibiting cancerous cells, making it a potential therapeutic candidate.


Asunto(s)
Asparaginasa , Asparagina , Asparaginasa/química , Simulación del Acoplamiento Molecular , Dispersión del Ángulo Pequeño , Difracción de Rayos X , Asparagina/química
15.
Cells ; 12(6)2023 03 22.
Artículo en Inglés | MEDLINE | ID: mdl-36980307

RESUMEN

Recently, the long-term use of sedative agents in the neonatal intensive care unit (NICU) has raised concerns about neurodevelopmental outcomes in exposed neonates. Midazolam (MDZ), a common neonatal sedative in the NICU, has been suggested to increase learning disturbances and cognitive impairment in children. However, molecular mechanisms contributing to such outcomes with long-term MDZ use during the early stages of life remain unclear. In this study, we for the first time elucidate the role of brain-derived extracellular vesicles (BDEVs), including mining the BDEV proteome post long-term MDZ exposure during early development. Employing our previously established rodent model system that mimics the exposure of MDZ in the NICU using an increasing dosage regimen, we isolated BDEVs from postnatal 21-days-old control and MDZ groups using a differential sucrose density gradient. BDEVs from the control and MDZ groups were then characterized using a ZetaView nanoparticle tracking analyzer and transmission electron microscopy analysis. Next, using RT-qPCR, we examined the expression of key ESCRT-related genes involved in EV biogenesis. Lastly, using quantitative mass spectrometry-based proteomics, we mined the BDEV protein cargo that revealed key differentially expressed proteins and associated molecular pathways to be altered post long-term MDZ exposure. Our study characterized the proteome in BDEV cargo from long-term MDZ exposure at early development. Importantly, we identified and validated the expression of YWHAH as a potential target for further characterization of its downstream mechanism and a potential biomarker for the early onset of neurodevelopment and neurodegenerative diseases. Overall, the present study demonstrated long-term exposure to MDZ at early development stages could influence BDEV protein cargo, which potentially impact neural functions and behavior at later stages of development.


Asunto(s)
Proteínas 14-3-3 , Vesículas Extracelulares , Midazolam , Animales , Ratas , Biomarcadores , Encéfalo , Vesículas Extracelulares/metabolismo , Hipnóticos y Sedantes/efectos adversos , Midazolam/efectos adversos , Midazolam/farmacología , Modelos Biológicos , Proteoma
16.
Heliyon ; 9(2): e13570, 2023 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-36865445

RESUMEN

Vedolizumab is a humanized monoclonal antibody used for inflammatory bowel disease treatment. Vedolizumab binds to the α4ß7 integrin complex and inhibits its binding to mucosal addressin cell adhesion molecule-1 (MAdCAM-1). To evaluate the binding efficacy and quality control check of Vedolizumab, flow cytometry is performed by using HuT78 cells. As we know, flow cytometer is costly and require high equipment maintenance with a designated technical manpower to handle it. In this regard, the aim of study was to develop and validate an economical, simple and efficient cell based ELISA assay for potency estimation of Vedolizumab which has not been reported in any pharmacopoeia. The proposed bioassay method was optimized by investigating Vedolizumab binding to α4ß7 integrin which is expressed by HuT78 cells. The validation of this method was done at different parameters including specificity, linearity, range, repeatability, precision, and accuracy. The Vedolizumab binding by ELISA results were found specific for Vedolizumab with linearity (R2 = 0.99) and precision (%Geometric Coefficient of variance) observed for repeatability and intermediate precision were 3.38% and 2.6% respectively. The relative bias was calculated as 8.68% for repeated performances by different analysts and found in accordance with parameter of accuracy as per various pharmacopoeial guidelines. The developed method is established as robust, effective, and less expensive than high maintenance setup like flow cytometry based assay.

17.
Front Plant Sci ; 14: 1259967, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37965034

RESUMEN

Lucerne (Medicago sativa L.) is the second most significant winter leguminous fodder crop after berseem in India. Breeder seed (BS) is the first stage of the seed production chain, as it is the base material for producing foundation and certified seeds. In India, lucerne BS demand has been reduced by 85.58% during the last 24 years (1998-1999 to 2021-2022), declining from 2150 kg to 310 kg. Out of 14 varieties released and notified so far, only nine varieties entered the seed chain since 1998-1999. It shows narrow varietal diversification and, hence, needs robust breeding programs towards enriching genetic variability and varietal development. The present study also highlights the disparity in BS demand and production over the years and puts forth the possible reasons behind the reduction in BS demand and production in the country. Out of the nine varieties, the BS demand of Anand-2 (53.11%) was highest, followed by Type-9 (19.44%) and RL-88 (13.60%). Varietal replacement rate (VRR) was found to be moderate, i.e., 23.67% for the varieties having <5 years old age in the last 3 years (2019-2020 to 2021-2022). It has also been estimated that BS produced (233 kg) during 2021-2022 can cover the approximate area of 6,300 ha at farmers' fields in 2024-2025 if the seed chain functions 100%, effectively. The present study provides a holistic overview of lucerne BS demand and production, challenges in BS production, and the way forward to develop more varieties and surplus BS production in the country.

18.
Anal Biochem ; 424(2): 114-23, 2012 May 15.
Artículo en Inglés | MEDLINE | ID: mdl-22370272

RESUMEN

Protein microarrays have emerged as an indispensable research tool for providing information about protein functions and interactions through high-throughput screening. Traditional methods for immobilizing biomolecules onto solid surfaces have been based on covalent and noncovalent binding, entrapment in semipermeable membranes, microencapsulation, sol gel, and hydrogel methods. Each of these techniques has its own strengths but fails to combine the most important tenets of a functional protein microarray such as covalent attachment, native protein conformation, homogeneity of the protein monolayer, control over active site orientation, and retention of protein activity. Here we present a selective and site-directed covalent immobilization technique for proteins via a benzoxazine ring formation through a Diels-Alder reaction in water and a genetically encoded 3-amino-L-tyrosine (3-NH(2)Tyr) amino acid. Fully functional protein microarrays, with monolayer arrangements and complete control over their orientations, were generated using this strategy.


Asunto(s)
Proteínas Inmovilizadas/química , Análisis por Matrices de Proteínas/métodos , Proteínas/química , Benzoxazinas/química , Escherichia coli , Ensayos Analíticos de Alto Rendimiento , Proteínas Inmovilizadas/genética , Microscopía de Fuerza Atómica , Ácido Peryódico/química , Plásmidos , Polietilenglicoles/química , Conformación Proteica , Proteínas/genética , Proteínas Recombinantes/química , Proteínas Recombinantes/genética , Dióxido de Silicio/química , Soluciones , Espectrometría de Masa por Ionización de Electrospray , Propiedades de Superficie , Tirosina/análogos & derivados , Tirosina/química , Agua
19.
Bioprocess Biosyst Eng ; 35(7): 1147-56, 2012 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-22331102

RESUMEN

1,3-propanediol (1,3-PD) is a chemical compound of immense importance primarily used as a raw material for fiber and textile industry. It can be produced by the fermentation of glycerol available abundantly as a by-product from the biodiesel plant. The present study was aimed at determination of key kinetic parameters of 1,3-PD fermentation by Clostridium diolis. Initial experiments on microbial growth inhibition were followed by optimization of nutrient medium recipe by statistical means. Batch kinetic data from studies in bioreactor using optimum concentration of variables obtained from statistical medium design was used for estimation of kinetic parameters of 1,3-PD production. Direct use of raw glycerol from biodiesel plant without any pre-treatment for 1,3-PD production using this strain investigated for the first time in this work gave results comparable to commercial glycerol. The parameter values obtained in this study would be used to develop a mathematical model for 1,3-PD to be used as a guide for designing various reactor operating strategies for further improving 1,3-PD production. An outline of protocol for model development has been discussed in the present work.


Asunto(s)
Clostridium/metabolismo , Fermentación , Glicoles de Propileno/metabolismo , Clostridium/crecimiento & desarrollo , Medios de Cultivo , Cinética
20.
Front Oncol ; 12: 1058931, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36568153

RESUMEN

Breast cancer remains the most commonly diagnosed cancer worldwide and exhibits a poor prognosis. The induction of genetic changes deregulates several genes that increase the disposal towards this life-threatening disease. CHAC2, a member of the glutathione degrading enzyme family has been shown to suppress gastric and colorectal cancer progression, however, the expression of CHAC2 in breast cancer has not been reported. We did an analysis of CHAC2 expression in breast cancer patients from various online tools like UALCAN, GEPIA2, GENT2, TIMER2, and bcGenExminer v4.8. Further, we used the Kaplan-Meier plotter to establish the significance of CHAC2 in BC patient survival and prognosis while TISIDB and TIMER databases were used to investigate the filtration of immune cells. The results showed that CHAC2 levels were high in breast cancer patients and elevated CHAC2 was associated with low overall survival. Taken together, the results of the present study show that like its paralog CHAC1, CHAC2 may also be an important biomarker and could have a potential therapeutic implication in breast cancer.

SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA