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1.
Cell ; 151(7): 1474-87, 2012 Dec 21.
Artigo em Inglês | MEDLINE | ID: mdl-23260137

RESUMO

DNA Ligase IV is responsible for sealing of double-strand breaks (DSBs) during nonhomologous end-joining (NHEJ). Inhibiting Ligase IV could result in amassing of DSBs, thereby serving as a strategy toward treatment of cancer. Here, we identify a molecule, SCR7 that inhibits joining of DSBs in cell-free repair system. SCR7 blocks Ligase IV-mediated joining by interfering with its DNA binding but not that of T4 DNA Ligase or Ligase I. SCR7 inhibits NHEJ in a Ligase IV-dependent manner within cells, and activates the intrinsic apoptotic pathway. More importantly, SCR7 impedes tumor progression in mouse models and when coadministered with DSB-inducing therapeutic modalities enhances their sensitivity significantly. This inhibitor to target NHEJ offers a strategy toward the treatment of cancer and improvement of existing regimens.


Assuntos
Quebras de DNA de Cadeia Dupla , Reparo do DNA por Junção de Extremidades/efeitos dos fármacos , DNA Ligases/antagonistas & inibidores , Neoplasias/tratamento farmacológico , Neoplasias/patologia , Pirimidinas/uso terapêutico , Bases de Schiff/uso terapêutico , Sequência de Aminoácidos , Animais , Linhagem Celular Tumoral , DNA Ligase Dependente de ATP , DNA Ligases/química , DNA Ligases/genética , Modelos Animais de Doenças , Desenho de Fármacos , Resistencia a Medicamentos Antineoplásicos , Humanos , Linfócitos/efeitos dos fármacos , Linfoma/tratamento farmacológico , Linfoma/patologia , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Nus , Modelos Moleculares , Dados de Sequência Molecular , Estrutura Terciária de Proteína , Pirimidinas/síntese química , Pirimidinas/química , Tolerância a Radiação , Ratos , Bases de Schiff/síntese química , Bases de Schiff/química , Alinhamento de Sequência
2.
Rheumatology (Oxford) ; 63(2): 466-471, 2024 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-37216898

RESUMO

OBJECTIVE: We aimed to assess SSc mortality by age in the general population over the past five decades. METHODS: This is a population-based study using a national mortality database and the census data for all US residents. We calculated the proportions of deaths for SSc and for all other causes (non-SSc) by age, and calculated age-standardized mortality rates (ASMRs) for SSc and non-SSc, and the ratio of SSc-ASMR to non-SSc-ASMR by age groups for each year from 1968 through 2015. We performed joinpoint regression to estimate the average annual percent change (AAPC) for each of these parameters. RESULTS: SSc was recorded as the underlying cause of death in 5457 decedents aged ≤44 years, 18 395 aged 45-64, and 22 946 aged ≥65 from 1968 through 2015. At ages ≤44, the proportion of annual deaths decreased more for SSc than for non-SSc: AAPC, -2.2% (95% CI, -2.4% to -2.0%) for SSc vs -1.5% (-1.9% to -1.1%) for non-SSc. Consistently, SSc-ASMR decreased from 1.0 (95% CI, 0.8-1.2) in 1968 to 0.4 (0.3-0.5) per million persons in 2015, a cumulative decrease of 60% at an AAPC of -1.9% (95% CI, -2.5% to -1.2%) at ages ≤44. The SSc-ASMR:non-SSc-ASMR ratio also decreased [cumulative -20%; AAPC -0.3% (95% CI, -1.15% to 0.55%)] in the ≤44-years group. In contrast, those aged ≥65 experienced a steep increase in the SSc-ASMR [cumulative 187.0%; AAPC 2.0% (95% CI, 1.8-2.2)] and the SSc-ASMR:non-SSc-ASMR ratio [cumulative 395.4%; AAPC 3.3% (95% CI, 2.9-3.7)]. CONCLUSION: Mortality for SSc has steadily decreased at younger ages over the past five decades.


Assuntos
Escleroderma Sistêmico , Humanos , Fatores de Risco , Bases de Dados Factuais , Mortalidade
3.
Langmuir ; 40(3): 1909-1921, 2024 Jan 23.
Artigo em Inglês | MEDLINE | ID: mdl-38197127

RESUMO

Novel three-phase polymer nanocomposites (PNCs) based on cerium oxide (CeO2) nanoparticles (NPs) and graphene nanoplatelets (GNPs) incorporated in a poly(vinylidene fluoride) (PVDF) matrix were formulated using a solution-casting approach. To understand the structural and morphological features of PVDF/CeO2/GNP nanocomposites (NCs), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analyses were accomplished. The PVDF/CeO2/GNP NCs displayed improved thermal stability which resulted from strong bonding between GNPs and CeO2 NPs and restriction of the polymer chain movement. The introduction of CeO2 NPs and GNPs within the PVDF matrix and good synergy between CeO2 NPs and GNPs led to variable mechanical properties of the prepared NCs. The PVDF/CeO2/GNP NCs portrayed reduced thermal stability, which could be due to the increased mobility of PVDF chains imposed by GNPs leading to the formation of volatile degradation products. Moreover, PVDF/CeO2/GNP NCs exhibited good electrical conductivity and high dielectric permittivity. The obtained dielectric permittivity value for the PVDF/CeO2/GNP NCs was 3-fold greater than PVDF/CeO2 NCs, making these novel tertiary composite materials a probable candidate for energy-storage applications.

4.
Luminescence ; 39(1): e4607, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-37795827

RESUMO

This article reports the systematic photoluminescence study of the various contents of gold nanocomposites in polyvinyl alcohol (PVA) films. The variations in the gold content in PVA film were 0.2, 0.5, 1.0, and 1.5 wt%. All the samples were excited at two selected wavelengths; those are at 400 nm and 532 nm. On exciting the gold-PVA nanocomposite films at 400 nm the photoluminescence was observed in the region of 430-500 nm in comparison to pure PVA films that show an emission at 400 nm. However, on exciting the gold-PVA nanocomposites at 532 nm, the emission was observed at 560-650 nm with a long tail till 700 nm that is unlike the pure PVA films that do not show any emission peak in this region. This suggests that emission between 430 and 500 nm regions is due to the coordination of PVA with gold nanoparticles because PVA has an emission at 400 nm. However, the emission peak between 560 and 650 nm is entirely due to the gold nanocomposite particle. The peak also shows a smaller red-shift that is usually with the increasing nanoparticles size with the increasing content in the PVA films. The formation of gold nanoparticles was justified by X-ray diffraction (XRD) analysis which is further supported by X-ray photoelectron spectroscopy (XPS) analysis.


Assuntos
Nanopartículas Metálicas , Nanocompostos , Nanopartículas , Álcool de Polivinil/química , Ouro , Nanopartículas Metálicas/química , Espectroscopia Fotoeletrônica , Difração de Raios X , Espectroscopia de Infravermelho com Transformada de Fourier , Nanopartículas/química , Nanocompostos/química
5.
Physiol Mol Biol Plants ; 30(5): 705-718, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38846464

RESUMO

Aluminium, a metallic element abundant in soils as aluminosilicates minerals, poses a toxic threat to plants, particularly in acidic soil conditions, thereby affecting their growth and development. Given their adaptability to diverse soil and climate conditions, Citrus plants have gained significant attention regarding their tolerance to Aluminium toxicity. In the North-eastern region of India, where soils are often slightly acidic with elevated aluminium levels, Citrus species are predominantly found. Understanding the tolerance mechanisms of these Citrus fruits and screening wild Citrus species for their adaptability to abiotic stresses is crucial for enhancing fruit production. Numerous investigations have demonstrated that Citrus species exhibit remarkable tolerance to aluminium contamination, surpassing the typical threshold of 30% incidence. When cultivated in acidic soils, Citrus plants encounter restricted root growth and reduced nutrient and moisture uptake, leading to various nutrient deficiency symptoms. However, promisingly, certain Citrus species such as Citrus jambhiri (Rough lemon), Poncirus trifoliata, Citrus sinensis, and Citrus grandis have shown considerable aluminium tolerance. This comprehensive review delves into the subject of aluminium toxicity and its implications, while also shedding light on the mechanisms through which Citrus plants develop tolerance to this element.

6.
Heart Fail Rev ; 28(3): 627-644, 2023 05.
Artigo em Inglês | MEDLINE | ID: mdl-36107271

RESUMO

Heart failure (HF) is a major deteriorating disease of the myocardium due to weak myocardial muscles. As such, the heart is unable to pump blood efficiently around the body to meet its constant demand. HF is a major global health problem with more than 7 million deaths annually worldwide, with some patients dying suddenly due to sudden cardiac death (SCD). There are several risk factors which are associated with HF and SCD which can negatively affect the heart synergistically. One major risk factor is diabetes mellitus (DM) which can cause an elevation in blood glucose level or hyperglycaemia (HG) which, in turn, has an insulting effect on the myocardium. This review attempted to explain the subcellular, cellular and molecular mechanisms and to a lesser extent, the genetic factors associated with the development of diabetes- induced cardiomyopathy due to the HG which can subsequently lead to chronic heart failure (CHF) and SCD. The study first explained the structure and function of the myocardium and then focussed mainly on the excitation-contraction coupling (ECC) processes highlighting the defects of calcium transporting (SERCA, NCX, RyR and connexin) and contractile regulatory (myosin, actin, titin and troponin) proteins. The study also highlighted new therapies and those under development, as well as preventative strategies to either treat or prevent diabetic cardiomyopathy (DCM). It is postulated that prevention is better than cure.


Assuntos
Diabetes Mellitus , Cardiomiopatias Diabéticas , Insuficiência Cardíaca , Hiperglicemia , Humanos , Cálcio/metabolismo , Proteínas Contráteis/metabolismo , Insuficiência Cardíaca/etiologia , Insuficiência Cardíaca/metabolismo , Miocárdio/metabolismo , Cardiomiopatias Diabéticas/metabolismo , Contração Miocárdica , Morte Súbita Cardíaca , Diabetes Mellitus/metabolismo
7.
Proc Natl Acad Sci U S A ; 117(33): 20004-20014, 2020 08 18.
Artigo em Inglês | MEDLINE | ID: mdl-32747568

RESUMO

KRAS, NRAS, and BRAF mutations which activate p44/42 mitogen-activated protein kinase (MAPK) signaling are found in half of myeloma patients and contribute to proteasome inhibitor (PI) resistance, but the underlying mechanisms are not fully understood. We established myeloma cell lines expressing wild-type (WT), constitutively active (CA) (G12V/G13D/Q61H), or dominant-negative (DN) (S17N)-KRAS and -NRAS, or BRAF-V600E. Cells expressing CA mutants showed increased proteasome maturation protein (POMP) and nuclear factor (erythroid-derived 2)-like 2 (NRF2) expression. This correlated with an increase in catalytically active proteasome subunit ß (PSMB)-8, PSMB9, and PSMB10, which occurred in an ETS transcription factor-dependent manner. Proteasome chymotrypsin-like, trypsin-like, and caspase-like activities were increased, and this enhanced capacity reduced PI sensitivity, while DN-KRAS and DN-NRAS did the opposite. Pharmacologic RAF or MAPK kinase (MEK) inhibitors decreased proteasome activity, and sensitized myeloma cells to PIs. CA-KRAS, CA-NRAS, and CA-BRAF down-regulated expression of endoplasmic reticulum (ER) stress proteins, and reduced unfolded protein response activation, while DN mutations increased both. Finally, a bortezomib (BTZ)/MEK inhibitor combination showed enhanced activity in vivo specifically in CA-NRAS models. Taken together, the data support the hypothesis that activating MAPK pathway mutations enhance PI resistance by increasing proteasome capacity, and provide a rationale for targeting such patients with PI/RAF or PI/MEK inhibitor combinations. Moreover, they argue these mutations promote myeloma survival by reducing cellular stress, thereby distancing plasma cells from the apoptotic threshold, potentially explaining their high frequency in myeloma.


Assuntos
Estresse do Retículo Endoplasmático , GTP Fosfo-Hidrolases/metabolismo , Proteínas de Membrana/metabolismo , Mieloma Múltiplo/metabolismo , Complexo de Endopeptidases do Proteassoma/metabolismo , Proteínas Proto-Oncogênicas B-raf/metabolismo , Proteínas Proto-Oncogênicas p21(ras)/metabolismo , Apoptose/efeitos dos fármacos , Bortezomib/farmacologia , Estresse do Retículo Endoplasmático/efeitos dos fármacos , GTP Fosfo-Hidrolases/genética , Humanos , Proteínas de Membrana/genética , Mieloma Múltiplo/genética , Mieloma Múltiplo/fisiopatologia , Mutação , Complexo de Endopeptidases do Proteassoma/genética , Inibidores de Proteínas Quinases/farmacologia , Proteínas Proto-Oncogênicas B-raf/genética , Proteínas Proto-Oncogênicas p21(ras)/genética
8.
Environ Dev Sustain ; : 1-12, 2023 Feb 08.
Artigo em Inglês | MEDLINE | ID: mdl-36785714

RESUMO

There has been a long-lasting impact of the lockdown imposed due to COVID-19 on several fronts. One such front is climate which has seen several implications. The consequences of climate change owing to this lockdown need to be explored taking into consideration various climatic indicators. Further impact on a local and global level would help the policymakers in drafting effective rules for handling challenges of climate change. For in-depth understanding, a temporal study is being conducted in a phased manner in the New Delhi region taking NO2 concentration and utilizing statistical methods to elaborate the quality of air during the lockdown and compared with a pre-lockdown period. In situ mean values of the NO2 concentration were taken for four different dates, viz. 4th February, 4th March, 4th April, and 25th April 2020. These concentrations were then compared with the Sentinel (5p) data across 36 locations in New Delhi which are found to be promising. The results indicated that the air quality has been improved maximum in Eastern Delhi and the NO2 concentrations were reduced by one-fourth than the pre-lockdown period, and thus, reduced activities due to lockdown have had a significant impact. The result also indicates the preciseness of Sentinel (5p) for NO2 concentrations.

9.
J Indian Assoc Pediatr Surg ; 28(4): 342-344, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37635885

RESUMO

Anorectal malformations (ARMs) are common congenital anomalies in neonates. Colonic perforation is very rare in ARMs. Delay in diagnosis of neonate with ARM results in colonic perforations and life-threatening morbidity. Colonic perforation due to ARM may not be completely avoided; however, early diagnosis and management are essential in assuring better outcomes.

10.
Environ Res ; 206: 112284, 2022 04 15.
Artigo em Inglês | MEDLINE | ID: mdl-34717942

RESUMO

Crop wastes are one of the agricultural wastes generated during the production and processing of food materials. Their generation is the other side of developmental activities. They are now becoming an alarming source of environmental pollution, leading to an unhealthy society. There is an urgent need to develop robust methods to utilize these types of wastes into beneficial compounds or materials. Many works are successfully done in these areas, and several strategies have been developed to produce biochemicals from biological wastes. In other words, value addition has been done to the crop waste materials. The chemicals like carbohydrates, minerals, proteins, and other compounds have been isolated from various crop residues. In this context, this article covers an overview of the crop wastes, chemicals isolated from them, their extraction methods, and the way forward to get the valuable chemicals.


Assuntos
Produtos Agrícolas , Resíduos , Agricultura , Poluição Ambiental , Resíduos Industriais
11.
Echocardiography ; 39(2): 302-309, 2022 02.
Artigo em Inglês | MEDLINE | ID: mdl-35026047

RESUMO

Chronic heart failure (CHF) has different stages and includes pre-HF (PHF), a state of high risk of developing myocardial dysfunction and advanced CHF. Some major behavioral risk factors of PHF might predispose to biological risk factors such as obesity, diabetes mellitus, dyslipidemia, hypertension, myocardial infarction, and cardiomyopathy. These risk factors damage the myocytes leading to fibrosis, apoptosis, cardiac hypertrophy, along with alterations in cardiomyocyte' size and shape. A condition of physiological subcellular remodeling resulting into a pathological state might be developed, conducting to PHF. Both PHF and heart failure (HF) are associated with the activation of phospholipases and protease, mitochondrial dysfunction, oxidative stress and development of intra-cellular free Ca2+  [Ca2+ ]i overloading to an elevation in diastolic [Ca2+ ]i . Simultaneously, cardiac gene expression is activated leading to further molecular, structural and biochemical changes of the myocardium. The sub-cellular remodeling may be intimately involved in the transition of cardiac hypertrophy to heart failure. 2D- and 3D-speckle tracking echocardiography (STE) have been used to quantify regional alterations of longitudinal strain and area strain, through their polar projection, which permits a further assessment of both sites and degrees of myocardial damage. The examination of strain can identify sub-clinical cardiac dysfunction or cardiomyocyte remodeling. During remodeling of the myocardium cardiac strain is attenuated, therefore it is an indicator of disease assessment.


Assuntos
Insuficiência Cardíaca , Infarto do Miocárdio , Disfunção Ventricular Esquerda , Diástole , Ecocardiografia/métodos , Insuficiência Cardíaca/diagnóstico , Humanos , Infarto do Miocárdio/complicações
12.
Int J Mol Sci ; 23(3)2022 Jan 26.
Artigo em Inglês | MEDLINE | ID: mdl-35163324

RESUMO

Copper (Cu) is an essential micronutrient required as a co-factor in the catalytic center of many enzymes. However, excess Cu can generate pleiotropic effects in the microbial cell. In addition, leaching of Cu from pipelines results in elevated Cu concentration in the environment, which is of public health concern. Sulfate-reducing bacteria (SRB) have been demonstrated to grow in toxic levels of Cu. However, reports on Cu toxicity towards SRB have primarily focused on the degree of toxicity and subsequent elimination. Here, Cu(II) stress-related effects on a model SRB, Desulfovibrio alaskensis G20, is reported. Cu(II) stress effects were assessed as alterations in the transcriptome through RNA-Seq at varying Cu(II) concentrations (5 µM and 15 µM). In the pairwise comparison of control vs. 5 µM Cu(II), 61.43% of genes were downregulated, and 38.57% were upregulated. In control vs. 15 µM Cu(II), 49.51% of genes were downregulated, and 50.5% were upregulated. The results indicated that the expression of inorganic ion transporters and translation machinery was massively modulated. Moreover, changes in the expression of critical biological processes such as DNA transcription and signal transduction were observed at high Cu(II) concentrations. These results will help us better understand the Cu(II) stress-response mechanism and provide avenues for future research.


Assuntos
Cobre/farmacologia , Desulfovibrio/efeitos dos fármacos , Desulfovibrio/genética , Estresse Fisiológico/efeitos dos fármacos , Estresse Fisiológico/genética , Sulfatos/farmacologia , Transcriptoma/efeitos dos fármacos , Proteínas de Bactérias/genética , Fenômenos Biológicos/genética , Transcriptoma/genética
13.
World J Microbiol Biotechnol ; 38(9): 149, 2022 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-35773545

RESUMO

Neisseria, a genus from the beta-proteobacteria class, is of potential clinical importance. This genus contains both pathogenic and commensal strains. Gonorrhea and meningitis are two major diseases caused by pathogens belonging to this genus. With the increased use of antimicrobial agents against these pathogens they have evolved the antimicrobial resistance capacity making these diseases nearly untreatable. The set of anti-bacterial resistance genes (resistome) and genes associated with signal processing (secretomes) are crucial for the host-microbial interaction. With the virtue of whole-genome sequences and computational biology, it is now possible to study the genomic and proteomic riddles of Neisseria along with their comprehensive evolutionary and metabolic profiling. We have studied relative synonymous codon usage, amino acid usage, reverse ecology, comparative genomics, evolutionary analysis and pathogen-host (Neisseria-human) interaction through bioinformatics analysis. Our analysis revealed the co-evolution of Neisseria genomes with the human host. Moreover, the co-occurrence of Neisseria and humans has been supported through reverse ecology analysis. A differential pattern of the evolutionary rate of resistomes and secretomes was evident among the pathogenic and commensal strains. Comparative genomics supported the presence of virulent genes in both pathogenic and commensal strains of the select genus. Our analysis also indicated a transition from commensal to pathogenic Neisseria strains through the long run of evolution.


Assuntos
Neisseria , Proteômica , Biologia Computacional , Genoma Bacteriano/genética , Genômica , Humanos , Neisseria/genética
14.
J Indian Assoc Pediatr Surg ; 27(6): 778-780, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36714471

RESUMO

We report a case of colonic agenesis with anorectal malformation in a newborn girl. The patient also presented with congenital heart disease. We are presenting the clinical features, intraoperative findings, and treatment plan.

15.
Indian J Public Health ; 66(2): 109-112, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35859490

RESUMO

Background: Access to pain management has been recognized as a fundamental human right. Inadequate pain relief hampers the quality of life and has a physiological and psychosocial impact on the patient and caregivers. Inadequate pain relief remains the leading cause of suffering in hospitalized patients worldwide. Objective: The objective of this article is to provide adequate pain relief to hospitalized patients through proper assessment, treatment, and monitoring of pain by the trained health-care workers through a sustainable and effective institutional pain management policy. Methods: The formulation of pain management policy at a tertiary care teaching institute was conducted in three phases - Phase 1: need assessment by an open-label, uncontrolled, prospective observational study over 1 month period, Phase 2: teaching, training, and awareness of health-care workers, and Phase 3: constitution of the committee at the institute level with the formation of pain resource teams. Results: An open-label, prospective observational study conducted over 1 month revealed that among 814 hospitalized patients, 108 out of 235 (46%) patients in medical and 385 out of 579 (66.5%) patients in the surgical cohort had NRS score of ≥3, implying an inadequate pain relief even at 24 h following medical or surgical intervention, respectively. Conclusion: The provision of effective and adequate pain relief to hospitalized patients requires trained health-care workers and a uniform and structured pain management policy at the institutional level. Recognition and addressal of the barriers and challenges while framing an institutional pain policy is of utmost importance.


Assuntos
Hospitais de Ensino , Política Organizacional , Manejo da Dor , Centros de Atenção Terciária , Humanos , Índia , Estudos Prospectivos
16.
Int J Inf Secur ; 21(5): 983-1003, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35530742

RESUMO

The astounding growth of the Internet has generated digital asset extensively. Users are concerned about asset management so that the asset can be conveyed successfully to the descendent posthumously. Very few works have addressed designing and modeling of digital asset inheritance (DAI) from a technical design perspective. They have several inherent limitations such as incorrect death confirmation, high participation of nominee, the possibility of failure to obtain recovery key, and are based on many unreasonable assumptions, thus inefficient to design in the real life. In this paper, we have formalized the different categories of digital assets and defined the various security goals, required functionalities, and necessary entities to build an asset inheritance model. We have also proposed a new protocol named digital asset inheritance protocol (DAIP) using certificateless encryption (CLE) and identity-based system (IBS) to convey the user's online persona efficiently to the descendent after his death. DAIP allows the nominee to successfully retrieve the asset after the user's demise, even if a nominee is uninformed regarding the asset. We, then, provide rigorous security proofs of various properties using real-ideal worlds paradigm. Finally, we have implemented DAIP model using PBC and pycryptodome library. The simulation results affirm that it can be practically efficient to implement.

17.
Blood ; 133(14): 1572-1584, 2019 04 04.
Artigo em Inglês | MEDLINE | ID: mdl-30737236

RESUMO

Three proteasome inhibitors have garnered regulatory approvals in various multiple myeloma settings; but drug resistance is an emerging challenge, prompting interest in blocking upstream components of the ubiquitin-proteasome pathway. One such attractive target is the E1 ubiquitin-activating enzyme (UAE); we therefore evaluated the activity of TAK-243, a novel and specific UAE inhibitor. TAK-243 potently suppressed myeloma cell line growth, induced apoptosis, and activated caspases while decreasing the abundance of ubiquitin-protein conjugates. This was accompanied by stabilization of many short-lived proteins, including p53, myeloid cell leukemia 1 (MCL-1), and c-MYC, and activation of the activating transcription factor 6 (ATF-6), inositol-requiring enzyme 1 (IRE-1), and protein kinase RNA-like endoplasmic reticulum (ER) kinase (PERK) arms of the ER stress response pathway, as well as oxidative stress. UAE inhibition showed comparable activity against otherwise isogenic cell lines with wild-type (WT) or deleted p53 despite induction of TP53 signaling in WT cells. Notably, TAK-243 overcame resistance to conventional drugs and novel agents in cell-line models, including bortezomib and carfilzomib resistance, and showed activity against primary cells from relapsed/refractory myeloma patients. In addition, TAK-243 showed strong synergy with a number of antimyeloma agents, including doxorubicin, melphalan, and panobinostat as measured by low combination indices. Finally, TAK-243 was active against a number of in vivo myeloma models in association with activation of ER stress. Taken together, the data support the conclusion that UAE inhibition could be an attractive strategy to move forward to the clinic for patients with relapsed and/or refractory multiple myeloma.


Assuntos
Resistencia a Medicamentos Antineoplásicos/efeitos dos fármacos , Mieloma Múltiplo/tratamento farmacológico , Inibidores de Proteassoma/farmacologia , Enzimas Ativadoras de Ubiquitina/antagonistas & inibidores , Resposta a Proteínas não Dobradas/efeitos dos fármacos , Antineoplásicos/uso terapêutico , Linhagem Celular Tumoral , Sinergismo Farmacológico , Estresse do Retículo Endoplasmático/efeitos dos fármacos , Humanos , Estresse Oxidativo/efeitos dos fármacos , Terapia de Salvação/métodos , Células Tumorais Cultivadas , Proteína Supressora de Tumor p53/efeitos dos fármacos , Proteína Supressora de Tumor p53/metabolismo
18.
Mol Pharm ; 18(5): 2053-2065, 2021 05 03.
Artigo em Inglês | MEDLINE | ID: mdl-33886324

RESUMO

We fabricated bilirubin-bovine serum albumin (BR-BSA) nanocomplexes as candidates for the delivery of 5-fluoro-2-deoxyuridine (5FUdr) against experimental murine lymphoma. BR was attached to 5FUdr via acid-labile ester bonds mimicking small-molecule drug conjugates. The construct was self-assembled with BSA through strong noncovalent interactions with high drug occupancy in the core and labeled with folic acid (FA) to target cancer cells. The BR-5FUdr-BSA-FA nanoconstruct exhibits excellent biocompatibility, prevents nephrotoxicity, and is tolerated by red blood cells and mononuclear cells. The construct also showed increased accumulation in lymph nodes and tumor cells. BR-5FUdr-BSA-FA caused prolonged growth inhibition and apoptosis, enhanced mitochondrial reactive oxygen species generation, and minimized the viability of parental and doxorubicin-resistant Dalton's lymphoma cells. Treatment of tumor-bearing mice with BR-5FUdr-BSA-FA significantly increased the life span of the animals, improved their histopathological parameters, and downregulated PD-1 expression, suggesting the potential of the construct for 5FUdr delivery to treat lymphoma.


Assuntos
Desoxiuridina/análogos & derivados , Portadores de Fármacos/química , Linfoma/tratamento farmacológico , Receptor de Morte Celular Programada 1/antagonistas & inibidores , Animais , Apoptose/efeitos dos fármacos , Bilirrubina/química , Materiais Biomiméticos/química , Linfócitos T CD8-Positivos/efeitos dos fármacos , Linfócitos T CD8-Positivos/metabolismo , Linhagem Celular Tumoral , Desoxiuridina/administração & dosagem , Desoxiuridina/farmacocinética , Modelos Animais de Doenças , Regulação para Baixo/efeitos dos fármacos , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Humanos , Linfoma/patologia , Camundongos , Receptor de Morte Celular Programada 1/metabolismo , Soroalbumina Bovina/química
19.
J Biochem Mol Toxicol ; 35(8): e22814, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-34047416

RESUMO

The aim of this study was to evaluate the potential of syringic acid (SA) against propylthiouracil (PTU)-induced hypothyroidism in rats. SA at a prestandardized dose, 50 mg/kg/day, was orally administered to PTU-induced hypothyroid rats for 30 days, and alterations in the levels of serum triiodothyronine (T3 ), thyroxine (T4 ), thyrotropin (TSH), alanine transaminase (ALT), and aspartate transaminase (AST); tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6); total cholesterol (CHOL) and triglycerides (TG); hepatic lipid peroxidation (LPO) and antioxidants (superoxide dismutase, catalase, glutathione peroxidase, and glutathione content), as well as histological changes in liver and thyroid were examined. The molecular interactions of the ligand, SA, with thyroid-related protein targets, such as human thyroid hormone receptor ß (hTRß), and thyroid peroxidase (TPO) protein, were studied using molecular docking. Whereas in hypothyroid animals, T4 , T3 , and antioxidants were decreased, there was an increase in TSH, TNF-α, IL-6, ALT, AST, and hepatic LPO; administration of SA in PTU-induced animals reversed all these indices to near normal levels. SA also improved the histological features of liver and thyroid gland. Our study clearly demonstrates SA as a novel thyroid agonist for augmenting the thyroid functions in rats. Molecular docking analysis reveals that SA possesses good binding affinity toward both the targets, hTRß and TPO. Through this approach, for the first time we provide the evidence for SA as a novel thyroid agonist and suggest a receptor-mediated mechanism for its thyroid stimulatory potential.


Assuntos
Ácido Gálico/análogos & derivados , Hipotireoidismo , Propiltiouracila/efeitos adversos , Receptores beta dos Hormônios Tireóideos/agonistas , Animais , Feminino , Ácido Gálico/farmacologia , Hipotireoidismo/sangue , Hipotireoidismo/induzido quimicamente , Hipotireoidismo/tratamento farmacológico , Propiltiouracila/farmacologia , Ratos , Ratos Wistar , Receptores beta dos Hormônios Tireóideos/metabolismo
20.
Int J Clin Pharmacol Ther ; 59(1): 17-25, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-33094728

RESUMO

OBJECTIVE: This single-arm real-world observation aims to examine the effects of empagliflozin (EMPA) on coronary risk factors among subjects with known diabetes. MATERIALS AND METHODS: Records of 63 subjects with type 2 diabetes mellitus, receiving EMPA were drawn for this study. Of 63 patients with diabetes, 6 were excluded, and the remaining 57 received EMPA (25 mg/day) for 24 weeks. Clinical data, dietary intakes, and physical activity were assessed by validated questionnaires. RESULTS: Treatment with EMPA was associated with significant decline in fasting and 2-hour post-prandial blood glucose and Hb1c indicating that this agent has potential antidiabetic effects. Pro-inflammatory cytokines; C-reactive protein, TNF-α, and interleukin-6 showed significant reduction after treatment with EMPA, compared to baseline levels. Apart from these changes, parameters of oxidative stress, thiobarbituric acid reactive substances, malondialdehyde, and diene conjugates as well as uric acid, showed a significant decline with an increase in antioxidant vitamins A, E, and C and beta-carotene as well as nitrite. There was a significant decline in serum uric acid, systolic and diastolic blood pressures, and angiotensin-converting enzyme (ACE), with a non-significant reduction in body weight and body mass index as well as in waist circumference of modest significance, after intervention of 12 weeks compared to baseline levels. Total cholesterol, VLDL cholesterol and triglycerides showed non-significant decline compared to baseline levels. CONCLUSION: It is possible that EMPA administration can cause a significant decline in pro-inflammatory cytokines along with blood glucose, Hb1c, oxidative stress, uric acid, blood pressures, and ACE with an increase in antioxidant vitamins and nitrite. Randomized, controlled intervention trials would be necessary to confirm our findings.


Assuntos
Diabetes Mellitus Tipo 2 , Compostos Benzidrílicos/efeitos adversos , Glicemia , Citocinas/química , Citocinas/farmacologia , Diabetes Mellitus Tipo 2/tratamento farmacológico , Glucosídeos , Humanos , Fatores de Risco , Ácido Úrico
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