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1.
Biomed Chromatogr ; 38(1): e5761, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-37920143

RESUMO

Selumetinib (SELU) was recently approved by the US Food and Drug Administration (US FDA) in 2020. However, the degradation impurities of SELU have not been characterized or identified to date. The mechanism for impurity formation and the degradation behavior have not been previously studied. This study aims to elucidate the prototypical degradation mechanism of SELU. Furthermore, the degradation impurities have been identified using LC-quadrupole-time-of-flight tandem mass spectrometry and are reported in this article for the first time. In addition, a stability-indicating analytical method (SIAM) has been developed for this drug. Forced degradation studies revealed the degradation of SELU under various stress conditions, including hydrolytic stress (acid and base), oxidative stress, and photolytic stress (ultraviolet and visible). Three degradation impurities were identified. This article presents the first validated SIAM, capable of accurately quantifying SELU in the presence of its degradation impurities. Furthermore, we have proposed the degradation pathway for SELU and its degradation impurities, a first in the field. The developed SIAM can find applications in process development and quality assurance of SELU in both research laboratories and pharmaceutical industries. Moreover, the identified degradation impurities may serve as impurity standards for quality control testing in pharmaceutical industries.


Assuntos
Contaminação de Medicamentos , Espectrometria de Massas em Tandem , Espectrometria de Massas em Tandem/métodos , Cromatografia Líquida de Alta Pressão/métodos , Estabilidade de Medicamentos , Cromatografia Líquida/métodos
2.
Biomed Chromatogr ; 38(1): e5760, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-37852619

RESUMO

Duvelisib (DUV) was first approved globally in 2018. An extensive literature search revealed that the differential role of a potential degradation medium in altering the shelf-life of DUV due to its exposure during storage has not been identified till date. Moreover, its degradation impurities and degradation mechanism are not known. In addition, no analytical method has been reported for the quantification of DUV in the presence of its degradation impurities. Therefore, the aim of this study was to identify the impact of different potential degradation media on the stability of DUV, establish the degradation mechanism, and identify its major degradation impurities. The aim was also to establish a stability-indicating analytical method for the quantification of DUV in the presence of its degradation impurities. This study is the first to report the structure of degradation impurities and the step-by-step degradation mechanism of DUV. This information will be useful for the scientific community and manufacturers in optimizing the formulation parameters and/or storage conditions. The validated method can be employed for analysis of stability study and routine quality control samples of newer DUV formulations in pharmaceutical industries. The identified impurities may serve as impurity standards for specifying their limits in the drug after required qualification studies.


Assuntos
Espectrometria de Massa com Cromatografia Líquida , Espectrometria de Massas em Tandem , Cromatografia Líquida , Cromatografia Líquida de Alta Pressão/métodos , Contaminação de Medicamentos , Estabilidade de Medicamentos
3.
Biomed Chromatogr ; 38(3): e5806, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38087453

RESUMO

DK-GV-04P, chemically identified as 3-cinnamyl-2-(4-methoxyphenyl) quinazolin-4(3H)-one, is an investigational molecule synthesized at the Chemical Biology Laboratory of the National Institute of Pharmaceutical Education and Research-Ahmedabad. The compound has shown potential anticancer activity against squamous CAL27 cell lines. Metabolite identification and characterization are critical in drug discovery, providing key insights into a compound's pharmacokinetics, pharmacodynamics safety, and metabolic fate. The primary aim of the study was to identify and characterize the in vitro metabolites of DK-GV-04P. In silico identification of the site of metabolism was also carried out using xenosite online software. The molecule was incubated with human liver microsomes and human S9 liver fraction to generate in vitro metabolites, which were further identified and characterized using ultra-high-performance liquid chromatography-quadrupole time of flight tandem mass spectrometry. A total of nine metabolites (four phase I and five phase II) were identified and characterized through tandem mass spectrometry. The major biotransformation pathways involved in metabolism of DK-GV-04P were hydroxylation, O-demethylation and glucuronidation. In addition to this, a detailed biotransformation pathway of DK-GV-04P has been established in this study.


Assuntos
Microssomos Hepáticos , Espectrometria de Massas em Tandem , Humanos , Cromatografia Líquida de Alta Pressão/métodos , Espectrometria de Massas em Tandem/métodos , Microssomos Hepáticos/metabolismo , Software , Descoberta de Drogas
4.
Anal Biochem ; 667: 115084, 2023 04 15.
Artigo em Inglês | MEDLINE | ID: mdl-36806669

RESUMO

Most antiretrovirals (ARVs) have intracellular therapeutic target sites and therefore, their plasma concentration may be misleading when relating to their efficacy or toxicity. A bioanalytical method for quantification of the ARV drug bictegravir (BTG) in its target site peripheral blood mononuclear cells (PBMCs) is not available till date. This is the first time to establish a sufficiently sensitive mass spectrometry-based bioanalytical method to quantify BTG in both rat PBMCs and plasma. The developed method was validated over the range of 1 ng/ml to 100 ng/ml and 0.005 ng-10ng/sample for plasma and PBMCs, respectively. For PBMCs, average accuracy and precision at four quality control levels were found to be 93.30%-110.00% and 6.52%-8.25%, respectively. Plasma and intracellular pharmacokinetics of BTG was evaluated by the developed method in rats and a lack of accumulation of BTG in the PBMCs was observed. Pearson correlation coefficient data analysis indicated a moderated correlation between plasma and PBMC concentration of BTG. Therefore, it will be beneficial to include a quantification plan for BTG in its actual therapeutic target site during all its future research and development work. This reported method can be useful for site-specific monitoring of BTG in research laboratories and pharmaceutical industries.


Assuntos
Leucócitos Mononucleares , Espectrometria de Massas em Tandem , Animais , Ratos , Espectrometria de Massas em Tandem/métodos , Cromatografia Líquida/métodos , Amidas , Reprodutibilidade dos Testes
5.
Rapid Commun Mass Spectrom ; 37(1): e9417, 2023 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-36226771

RESUMO

RATIONALE: Capmatinib (CMT) has been recently approved for the treatment of non-small cell lung cancer by the United States Food and Drug Administration (USFDA). Till date, the degradation mechanism of CMT in different stress conditions is not known. Moreover, degradation products (DPs) of the drug are yet to be identified. Characterization study on degradation products of CMT has not been reported before. Furthermore, no previously reported literature is available on the stability-indicating method of CMT. METHODS: Owing to the lack of such scientific reports, we developed a sensitive, stability-indicating method for CMT which can resolve it from all its degradation products. The method was validated as per the International Council for Harmonization of Technical Requirements for Pharmaceuticals for Human Use (ICH Q2 [R1]) guideline. We studied and established the degradation mechanism of CMT in different stress conditions. One degradation product (DP2) was isolated and characterized using 1 H NMR. RESULTS: The degradation products (DP1, DP2 and DP3) of the drug have been identified and characterized for the first time by using high-resolution mass spectrometry and 1 H NMR spectroscopy. CMT was found to become degraded under acidic, basic and photolytic stress conditions in the solution phase to yield three major DPs. The drug was found to be stable in neutral hydrolysis, oxidation and thermal stress conditions. CONCLUSIONS: DP1 was formed under acidic and basic hydrolytic conditions, whereas DP2 and DP3 were formed under photolytic conditions. Characterization of all the DPs has been carried out to establish their structures and understand the molecular mechanism behind the degradation of the drug. Few studies reported quantitative analysis of CMT and its metabolites in biological fluids. However, this is the first study to identify the unknown DPs of CMT and the mechanism of its degradation. Moreover, this article reports a stability-indicating analytical method for CMT which has not yet been reported in any literature.


Assuntos
Carcinoma Pulmonar de Células não Pequenas , Humanos , Carcinoma Pulmonar de Células não Pequenas/tratamento farmacológico , Cromatografia Líquida de Alta Pressão/métodos , Estabilidade de Medicamentos , Hidrólise , Neoplasias Pulmonares/tratamento farmacológico , Oxirredução , Fotólise , Espectrometria de Massas por Ionização por Electrospray/métodos , Espectrometria de Massas em Tandem/métodos
6.
Biomed Chromatogr ; 37(6): e5618, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-36882885

RESUMO

Pyruvate kinase (PK) M2 activators ramp up glycolysis in cancer cells, leading to a reversal of the Warburg effect in cancer cells. A promising PKM2 activator molecule, IMID-2, developed by the National Institute of Pharmaceutical Education and Research-Ahmedabad showed promising anticancer activity against MCF-7 and COLO-205 cell lines, which represent breast and colon cancer. Its physicochemical properties, like solubility, ionization constant, partition coefficient and distribution constant, have already been established. Its metabolic pathway is also well established through in vitro and in vivo metabolite profiling and reported previously. In this study, we have evaluated the metabolic stability of IMID-2 using LC-MS/MS and investigated the safety aspect of the molecule through an acute oral toxicity study. In vivo studies in rats confirmed that the molecule is safe even at a dose level of 175 mg/kg. Furthermore, a pharmacokinetic study of IMID-2 was also carried out using LC-MS/MS to understand its absorption, distribution, metabolism, and excretion profile. The molecule was found to have promising bioavailability through the oral route. This research work is thus another step in the drug testing of this promising anticancer molecule. The molecule can be considered to be a potential anticancer lead based on the earlier report substantiated by current findings.


Assuntos
Descoberta de Drogas , Espectrometria de Massas em Tandem , Ratos , Animais , Cromatografia Líquida , Disponibilidade Biológica
7.
Drug Metab Rev ; 54(2): 101-119, 2022 05.
Artigo em Inglês | MEDLINE | ID: mdl-35254954

RESUMO

Induction of drug-metabolizing enzymes and efflux transporters (DMET) through activation of pregnane x receptor (PXR) is the primary factor involved in almost all bioavailability and drug resistance-related problems of anticancer drugs. PXR is a transcriptional regulator of many metabolizing enzymes and efflux transporters proteins like p-glycoprotein (p-gp), multidrug resistant protein 1 and 2 (MRP 1 and 2), and breast cancer resistant protein (BCRP), etc. Several anticancer drugs are potent activators of PXR receptors and can modulate the gene expression of DMET proteins. Involvement of anticancer drugs in transcriptional regulation of DMET can prompt increased metabolism and efflux of their own or other co-administered drugs, which leads to poor site-specific bioavailability and increased drug resistance. In this review, we have discussed several novel strategies to evade drug-induced PXR activation and p-gp efflux including assessment of PXR ligand and p-gp substrate at early stages of drug discovery. Additionally, we have critically discussed the chemical structure and drug delivery-based approaches to avoid PXR binding and inhibit the p-gp activity of the drugs at their target sites.


Assuntos
Antineoplásicos , Receptores de Esteroides , Membro 2 da Subfamília G de Transportadores de Cassetes de Ligação de ATP/genética , Membro 2 da Subfamília G de Transportadores de Cassetes de Ligação de ATP/metabolismo , Antineoplásicos/farmacologia , Descoberta de Drogas , Resistência a Múltiplos Medicamentos , Humanos , Metabolômica , Proteínas de Neoplasias/genética , Proteínas de Neoplasias/metabolismo , Preparações Farmacêuticas , Receptores de Esteroides/metabolismo
8.
Rapid Commun Mass Spectrom ; 36(22): e9385, 2022 Nov 30.
Artigo em Inglês | MEDLINE | ID: mdl-36018833

RESUMO

RATIONALE: Metabolite profiling is an integral part of the drug development process for selecting candidates with high therapeutic efficacy and low risk. Baricitinib (BARI) was approved in 2018 by the US Food and Drug Administration to treat rheumatoid arthritis. According to the available literature, no systematic study has been reported on the metabolite profiling of BARI. The biotransformation pathway of the drug has also not been established until recently. This study aims to identify BARI metabolites generated in in vitro matrices. METHODS: The in vitro metabolism study was carried out using rat liver microsome, human liver microsomes, and human S9 fraction. Ultra high-performance liquid chromatography quadrupole time-of-flight tandem mass spectrometry (U-HPLC-Q/TOF) and ultra-high-performance liquid chromatography/linear ion trap-Orbitrap mass spectrometry (U-HPLC/LTQ-Orbitrap-MS/MS) were used to identify and characterize the metabolites of BARI. The in silico toxicity of BARI and its metabolite was studied using ProTox-II toxicity predictor software. RESULTS: A total of five new metabolites have been identified amongst which two (M1 and M2) were detected on both U-HPLC/LTQ-Orbitrap-MS/MS and U-HPLC-Q/TOF and two additional metabolites (M4 and M5) were detected on U-HPLC/LTQ-Orbitrap-MS/MS. Moreover, one metabolite (M3) was only detected on LC-QTOF. CONCLUSIONS: The major metabolic changes were found to be N-dealkylation, demethylation, hydroxylation, and hydrolysis. Metabolites M3 and M4 were found to have the potential for carcinogenicity. The novelty of the study can be justified by the unavailability of any previous research on in vitro metabolite profiling of BARI. Furthermore, this is the first time the biotransformation pathway of BARI and the toxicity potential of its metabolites have been reported.


Assuntos
Microssomos Hepáticos , Espectrometria de Massas em Tandem , Animais , Azetidinas , Cromatografia Líquida de Alta Pressão/métodos , Humanos , Microssomos Hepáticos/metabolismo , Protoporfirinogênio Oxidase/metabolismo , Purinas , Pirazóis , Ratos , Sulfonamidas , Espectrometria de Massas em Tandem/métodos
9.
Biomed Chromatogr ; 36(4): e5314, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-34981541

RESUMO

Duvelisib is a dual inhibitor of phosphoinositide 3 kinase that received global approval by the US Food and Drug Administration in 2018 to treat follicular lymphoma after at least two prior systemic therapies. An extensive literature search revealed that, to date, metabolites of duvelisib have not been characterized and information on them is not available in any of the literature. Moreover, the metabolism pathway is yet to be established. This study aimed to investigate and characterize the metabolites of duvelisib generated in microsomes and S9 fractions. In this study, five duvelisib metabolites were identified using UHPLC-Q-TOF-MS/MS analysis technique. The structural characterization of the metabolites was performed by comparing the fragmentation pattern of duvelisib and its metabolites through an accurate mass measurement technique. Three metabolites were generated through phase I hydroxylation and dechlorination reactions. The other two metabolites were generated through a phase II glucuronidation reaction. The metabolism mechanism established through this study can be useful to improve the safety profile of drugs of similar categories in the future after establishment of the toxicity profile of the identified metabolites.


Assuntos
Fosfatidilinositol 3-Quinases , Espectrometria de Massas em Tandem , Cromatografia Líquida de Alta Pressão/métodos , Isoquinolinas , Purinas , Espectrometria de Massas em Tandem/métodos
10.
Biomed Chromatogr ; 35(11): e5201, 2021 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-34148241

RESUMO

Brexpiprazole (BRX) is approved for the treatment of schizophrenia and major depressive disorders and it is mainly metabolized by CYP3A4 and CYP2D6. Grapefruit juice (GFJ), pomegranate juice (PJ) and tomato juice (TJ) have the potential to inhibit CYP3A4 enzymes in the body. However, fruit juice-drug interactions between BRX and GFJ, PJ and TJ have not been studied extensively. The present study describes the influence of GFJ, PJ and TJ on the pharmacokinetic parameters of BRX in rats. The study samples were analyzed using a mass-accurate and single-step bioanalytical method by ultra-high-performance liquid chromatography-quadrupole time-of-flight mass spectrometry over a wide calibration range of 20-1,500 ng/ml. The results of the pharmacokinetic study denoted that the combined administration of GFJ and PJ could increase systemic exposure of BRX. The area under the curve of BRX increased 3.43- and 1.88-fold with co-administration of GFJ and PJ, respectively, while TJ with BRX had no effect on the area under the curve. Time to peak concentration and half-life were not significantly changed by any juice co-administration. The results show that GFJ and PJ affect the pharmacokinetic profile of BRX and hence advice needs to be given to patients.


Assuntos
Cromatografia Líquida de Alta Pressão/métodos , Sucos de Frutas e Vegetais , Espectrometria de Massas/métodos , Quinolonas , Tiofenos , Animais , Citrus paradisi/química , Interações Ervas-Drogas , Limite de Detecção , Modelos Lineares , Solanum lycopersicum/química , Masculino , Punica granatum/química , Quinolonas/análise , Quinolonas/farmacocinética , Ratos , Ratos Sprague-Dawley , Reprodutibilidade dos Testes , Tiofenos/análise , Tiofenos/farmacocinética
12.
Biomed Chromatogr ; 34(6): e4825, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32166756

RESUMO

Treatment through a combination of drugs involving cyclin D-dependent kinase inhibitors like abemaciclib and aromatase inhibitor like letrozole proved to be a potential therapeutic regimen and first-line treatment in estrogen receptor-positive breast cancer. In this study, we developed a simple and simultaneous RP-HPLC bioanalytical method for quantifying abemaciclib and letrozole in rat plasma. Abemaciclib and letrozole were separated on Zorbax Eclipse C18 column employing a gradient elution method comprising 10 mM ammonium acetate (pH 5) and acetonitrile as mobile phase. The method was found to have acceptable selectivity, accuracy (97.20-118.17%), precision (1.10-9.39%) and stability in the validation experiment performed as per the US Food and Drug Administration guidelines. The method sensitivity was low at a concentration level of 100 ng/ml. The applicability of the method has been verified through a single-dose oral pharmacokinetic study in rat. The developed method will be useful to quantitate the analytes in rat plasma samples of different preclinical studies including their pharmacokinetic drug-drug interactions in the future. To date, no method has been reported for the quantification of abemaciclib and letrozole simultaneously in any type of biological matrices. Therefore, this study makes a definite significant contribution in the field of bioanalytical research.


Assuntos
Aminopiridinas/sangue , Aminopiridinas/farmacocinética , Benzimidazóis/sangue , Benzimidazóis/farmacocinética , Letrozol/sangue , Letrozol/farmacocinética , Aminopiridinas/química , Animais , Benzimidazóis/química , Cromatografia Líquida de Alta Pressão/métodos , Feminino , Letrozol/química , Limite de Detecção , Modelos Lineares , Ratos , Ratos Sprague-Dawley , Reprodutibilidade dos Testes
13.
Virus Genes ; 55(1): 51-59, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30446925

RESUMO

Sheeppox disease is associated with significant losses in sheep production world over. The sheep pox virus, the goatpox virus, and the lumpy skin disease virus cannot be distinguished by conventional serological tests. Identification of these pathogens needs molecular methods. In this study, seven genes viz. EEV maturation protein-F12L, Virion protein-D3R, RNA polymerase subunit-A5R, Virion core protein-A10L, EEV glycoprotein-A33R, VARV B22R homologue, and Kelch like protein-A55R that cover the start, middle, and end of the genome were selected. These genes were amplified from Roumanian-Fanar vaccine strain and Jaipur virulent strain, cloned, and sequenced. On analysis with the available database sequences, VARV B22R homologue was identified as a marker for phylogenetic reconstruction for classifying the sheeppox viruses of the ungulates. Further, divergence time dating with VARV B22R gene accurately predicted the sheeppox disease outbreak involving Jaipur virulent strain.


Assuntos
Capripoxvirus/classificação , Capripoxvirus/genética , Evolução Molecular , Mutação , Filogenia , Infecções por Poxviridae/virologia , Proteínas Virais/genética , Animais , Sequência de Bases , Clonagem Molecular , Fases de Leitura Aberta , Análise de Sequência de DNA , Ovinos , Doenças dos Ovinos/virologia
14.
Biomed Chromatogr ; 33(12): e4672, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31386207

RESUMO

The combination of acebrophylline (ABP), levocetirizine (LCZ) and pranlukast (PRN) is used to treat allergic rhinitis, asthma, hay-fever and other conditions where patients experience difficulty in breathing. This study was carried out with the aim of developing and validating a reverse-phase high-performance liquid chromatographic bioanalytical method to simultaneously quantitate ABP, LCZ and PRN in rat plasma. The objective also includes determination of the pharmacokinetic interaction of these three drugs after administration via the oral route after individual and combination treatment in rat. Optimum resolution between the analytes was observed with a C18 Kinetex column (250 mm × 4.6 mm × 5 µm). The chromatography was performed in a gradient elution mode with a 1 mL/min flow rate. The calibration curves were linear over the concentration range of 100-1600 ng/mL. The intra- and inter-day precision and accuracy were found to be within acceptable limits as specified in US Food and Drug Administration guideline for bioanalytical method validation. The analytes were stable on the bench-top (8 h), after three freeze-thaw cycles, in the autosampler (8 h) and as a dry extract (-80°C for 48 h). The statistical results of the pharmacokinetic study in Sprague-Dawley rats showed a significant change in pharmacokinetic parameters for PRN upon co-administration of the three drugs.


Assuntos
Ambroxol/análogos & derivados , Cetirizina , Cromonas , Teofilina/análogos & derivados , Ambroxol/sangue , Ambroxol/química , Ambroxol/farmacocinética , Animais , Cetirizina/sangue , Cetirizina/química , Cetirizina/farmacocinética , Cromatografia Líquida de Alta Pressão , Cromonas/sangue , Cromonas/química , Cromonas/farmacocinética , Limite de Detecção , Modelos Lineares , Masculino , Ratos , Ratos Sprague-Dawley , Reprodutibilidade dos Testes , Teofilina/sangue , Teofilina/química , Teofilina/farmacocinética
15.
Microb Pathog ; 117: 206-218, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-29476787

RESUMO

Here, we studied the in vivo expression of Th1 (IL2 and IFN gamma) and Th2 (IL4 and IL10) - cytokines and antiviral molecules - IRF3 and ISG15 in peripheral blood mononuclear cells in relation to antigen and antibody dynamics under Peste des petits ruminants virus (PPRV) vaccination, infection and challenge in both sheep and goats. Vaccinated goats were seropositive by 9 days post vaccination (dpv) while in sheep idiosyncratic response was observed between 9 and 14 dpv for different animals. Expression of PPRV N gene was not detected in PBMCs of vaccinated and vaccinated challenged groups of both species, but was detected in unvaccinated infected PBMCs at 9 and 14 days post infection. The higher viral load at 9 dpi coincided with the peak clinical signs of the disease. The peak in viral replication at 9 dpi correlated with significant expression of antiviral molecules IRF3, ISG15 and IFN gamma in both the species. With the progression of disease, the decrease in N gene expression also correlated with the decrease in expression of IRF3, ISG15 and IFN gamma. In the unvaccinated infected animals ISG15, IRF3, IFN gamma and IL10 expression was higher than vaccinated animals. The IFN gamma expression predominated over IL4 in both vaccinated and infected animals with the infected exhibiting a stronger Th1 response. The persistent upregulation of this antiviral molecular signature - ISG15 and IRF3 even after 2 weeks post vaccination, presumably reflects the ongoing stimulation of innate immune cells.


Assuntos
Citocinas/biossíntese , Regulação da Expressão Gênica/imunologia , Peste dos Pequenos Ruminantes/imunologia , Vírus da Peste dos Pequenos Ruminantes/imunologia , Tropismo/imunologia , Vacinação/veterinária , Vacinas Virais/imunologia , Eliminação de Partículas Virais/imunologia , Animais , Anticorpos Antivirais/sangue , Antígenos Virais/sangue , Antivirais/farmacologia , Citocinas/genética , Perfilação da Expressão Gênica , Regulação da Expressão Gênica/genética , Genes Virais/genética , Doenças das Cabras/imunologia , Doenças das Cabras/prevenção & controle , Doenças das Cabras/virologia , Cabras , Interações Hospedeiro-Patógeno/genética , Interações Hospedeiro-Patógeno/imunologia , Fator Regulador 3 de Interferon/biossíntese , Fator Regulador 3 de Interferon/genética , Interferon gama/biossíntese , Interferon gama/genética , Interleucina-10/biossíntese , Interleucina-10/genética , Interleucina-2/biossíntese , Interleucina-2/genética , Interleucina-4/biossíntese , Interleucina-4/genética , Cinética , Leucócitos Mononucleares/imunologia , Peste dos Pequenos Ruminantes/patologia , Peste dos Pequenos Ruminantes/prevenção & controle , Peste dos Pequenos Ruminantes/virologia , Vírus da Peste dos Pequenos Ruminantes/genética , Vírus da Peste dos Pequenos Ruminantes/patogenicidade , Ruminantes/imunologia , Ovinos , Doenças dos Ovinos/imunologia , Doenças dos Ovinos/prevenção & controle , Doenças dos Ovinos/virologia , Fatores de Tempo , Vacinas Atenuadas/imunologia , Carga Viral , Replicação Viral
16.
Arch Virol ; 162(6): 1677-1693, 2017 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-28247095

RESUMO

Peste des petits ruminants is an important transboundary disease infecting small ruminants. Genome or gene sequence analysis enriches our knowledge about the evolution and transboundary nature of the causative agent of this disease, peste des petits ruminants virus (PPRV). Although analysis using whole genome sequences of pathogens leads to more precise phylogenetic relationships, when compared to individual genes or partial sequences, there is still a need to identify specific genes/genomic regions that can provide evolutionary assessments consistent with those predicted with full-length genome sequences. Here the virulent Izatnagar/94 PPRV isolate was assembled and compared to all available complete genome sequences (currently in the NCBI database) to estimate nucleotide diversity and to deduce evolutionary relationships between genes/genomic regions and the full length genomes. Our aim was to identify the preferred candidate gene for use as a phylogenetic marker, as well as to predict divergence time and explore PPRV phylogeography. Among all the PPRV genes, the H gene was identified to be the most diverse with the highest evolutionary relationship with the full genome sequences. Hence it is considered as the most preferred candidate gene for phylogenetic study with 93% identity set as a nucleotide cutoff. A whole genome nucleotide sequence cutoff value of 94% permitted specific differentiation of PPRV lineages. All the isolates examined in the study were found to have a most recent common ancestor in the late 19th or in the early 20th century with high posterior probability values. The Bayesian skyline plot revealed a decrease in genetic diversity among lineage IV isolates since the start of the vaccination program and the network analysis localized the ancestry of PPRV to Africa.


Assuntos
Genoma Viral , Doenças das Cabras/virologia , Peste dos Pequenos Ruminantes/virologia , Vírus da Peste dos Pequenos Ruminantes/genética , Vírus da Peste dos Pequenos Ruminantes/isolamento & purificação , Doenças dos Ovinos/virologia , Animais , Evolução Molecular , Cabras , Índia , Vírus da Peste dos Pequenos Ruminantes/classificação , Filogenia , Filogeografia , Ovinos
17.
Angew Chem Int Ed Engl ; 55(27): 7811-5, 2016 06 27.
Artigo em Inglês | MEDLINE | ID: mdl-26855323

RESUMO

A three-dimensional water-stable cationic metal-organic framework (MOF) pillared by a neutral ligand and with Ni(II)  metal nodes has been synthesized employing a rational design approach. Owing to the ordered arrangement of the uncoordinated tetrahedral sulfate (SO4 (2-) ) ions in the channels, the compound has been employed for aqueous-phase ion-exchange applications. The compound exhibits rapid and colorimetric aqueous-phase capture of environmentally toxic oxoanions (with similar geometries) in a selective manner. This system is the first example of a MOF-based system which absorbs both dichromate (Cr2 O7 (2-) ) and permanganate (MnO4 (-) ) ions, with the latter acting as a model for the radioactive contaminant pertechnetate (TcO4 (-) ).


Assuntos
Cromatos/isolamento & purificação , Compostos de Manganês/isolamento & purificação , Estruturas Metalorgânicas/química , Níquel/química , Óxidos/isolamento & purificação , Pertecnetato Tc 99m de Sódio/isolamento & purificação , Poluentes da Água/isolamento & purificação , Adsorção , Ânions/isolamento & purificação , Cátions/química , Modelos Moleculares , Água/química , Poluentes Químicos da Água/isolamento & purificação , Poluentes Radioativos da Água/isolamento & purificação
18.
Curr Drug Targets ; 2024 Jan 11.
Artigo em Inglês | MEDLINE | ID: mdl-38213164

RESUMO

BACKGROUND: Tablet formulation could be revolutionized by the integration of modern technology and established pharmaceutical sciences. The pharmaceutical sector can develop tablet formulations that are not only more efficient and stable but also patient-friendly by utilizing artificial intelligence (AI), machine learning (ML), and materials science. OBJECTIVES: The primary objective of this review is to explore the advancements in tablet technology, focusing on the integration of modern technologies like artificial intelligence (AI), machine learning (ML), and materials science to enhance the efficiency, cost-effectiveness, and quality of tablet formulation processes. METHODS: This review delves into the utilization of AI and ML techniques within pharmaceutical research and development. The review also discusses various ML methodologies employed, including artificial neural networks, an ensemble of regression trees, support vector machines, and multivariate data analysis techniques. RESULTS: Recent studies showcased in this review demonstrate the feasibility and effectiveness of ML approaches in pharmaceutical research. The application of AI and ML in pharmaceutical research has shown promising results, offering a potential avenue for significant improvements in the product development process. CONCLUSION: The integration of nanotechnology, AI, ML, and materials science with traditional pharmaceutical sciences presents a remarkable opportunity for enhancing tablet formulation processes. This review collectively underscores the transformative role that AI and ML can play in advancing pharmaceutical research and development, ultimately leading to more efficient, reliable and patient-centric tablet formulations.

19.
Cureus ; 16(3): e55339, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38559502

RESUMO

This case report describes a rare occurrence of talar osteochondroma extending into syndesmosis, causing disruption of the interosseous membrane and the posterior inferior tibiofibular ligament (PITFL). This type of presentation for a talar osteochondroma is the first of its kind reported in the literature based on current knowledge. A detailed preoperative radiological assessment was crucial in planning the surgical approach and preparing for syndesmotic stabilization during the excision. The patient underwent successful and complete excision of the osteochondroma, and the syndesmosis was stabilized using a cortical screw along with anatomical repair of the PITFL. Apart from delayed wound healing, the patient exhibited good functional outcomes in terms of gait and ankle range of motion at the six-month follow-up. This case serves as a valuable reference for similar presentations in the future, emphasizing the importance of thorough preoperative assessment and appropriate treatment planning.

20.
Curr Rheumatol Rev ; 2024 Jan 25.
Artigo em Inglês | MEDLINE | ID: mdl-38284718

RESUMO

BACKGROUND: Guggulipid, an oleo-gum resin extracted from the bark of Commiphora wightii of the Burseraceae family, holds a significant place in Ayurvedic medicine due to its historical use in treating various disorders, including inflammation, gout, rheumatism, obesity, and lipid metabolism imbalances. OBJECTIVE: This comprehensive review aims to elucidate the molecular targets of guggulipids and explore their cellular responses. Furthermore, it summarizes the findings from in-vitro, in-vivo, and clinical investigations related to arthritis and various inflammatory conditions. METHODS: A comprehensive survey encompassing in-vitro, in-vivo, and clinical studies has been conducted to explore the therapeutic capacity of guggulipid in the management of rheumatoid arthritis. Various molecular pathways, such as cyclooxygenase-2 (COX-2), vascular endothelial growth factor (VEGF), PI3-kinase/AKT, JAK/STAT, nitric oxide synthase (iNOS), and NFκB signaling pathways, have been targeted to assess the antiarthritic and anti-inflammatory effects of this compound. RESULTS: The research findings reveal that guggulipid demonstrates notable antiarthritic and anti-inflammatory effects by targeting key molecular pathways involved in inflammatory responses. These pathways include COX-2, VEGF, PI3-kinase/AKT, JAK/STAT, iNOS, and NFκB signaling pathways. in-vitro, in-vivo, and clinical studies collectively support the therapeutic potential of guggulipid in managing rheumatoid arthritis and related inflammatory conditions. CONCLUSION: This review provides a deeper understanding of the therapeutic mechanisms and potential of guggulipid in the management of rheumatoid arthritis. The collective evidence strongly supports the promising role of guggulipid as a therapeutic agent, encouraging further research and development in guggulipid-based treatments for these conditions.

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