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1.
EMBO J ; 42(1): e111389, 2023 01 04.
Artículo en Inglés | MEDLINE | ID: mdl-36444797

RESUMEN

The cellular activation of the NLRP3 inflammasome is spatiotemporally orchestrated by various organelles, but whether lysosomes contribute to this process remains unclear. Here, we show the vital role of the lysosomal membrane-tethered Ragulator complex in NLRP3 inflammasome activation. Deficiency of Lamtor1, an essential component of the Ragulator complex, abrogated NLRP3 inflammasome activation in murine macrophages and human monocytic cells. Myeloid-specific Lamtor1-deficient mice showed marked attenuation of NLRP3-associated inflammatory disease severity, including LPS-induced sepsis, alum-induced peritonitis, and monosodium urate (MSU)-induced arthritis. Mechanistically, Lamtor1 interacted with both NLRP3 and histone deacetylase 6 (HDAC6). HDAC6 enhances the interaction between Lamtor1 and NLRP3, resulting in NLRP3 inflammasome activation. DL-all-rac-α-tocopherol, a synthetic form of vitamin E, inhibited the Lamtor1-HDAC6 interaction, resulting in diminished NLRP3 inflammasome activation. Further, DL-all-rac-α-tocopherol alleviated acute gouty arthritis and MSU-induced peritonitis. These results provide novel insights into the role of lysosomes in the activation of NLRP3 inflammasomes by the Ragulator complex.


Asunto(s)
Inflamasomas , Peritonitis , Ratones , Humanos , Animales , Proteína con Dominio Pirina 3 de la Familia NLR/genética , Inflamación , Histona Desacetilasa 6/genética , alfa-Tocoferol , Ácido Úrico , Peritonitis/inducido químicamente , Lisosomas , Ratones Endogámicos C57BL
2.
Anal Biochem ; 695: 115638, 2024 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-39127328

RESUMEN

Phospholipid fatty acid (PLFA) analysis is used for characterizing microbial communities based on their lipid profiles. This method avoids biases from PCR or culture, allowing data collection in a natural state. However, PLFA is labor-intensive due to lipid fractionation. Simplified ester-linked fatty acid analysis (ELFA), which skips lipid fractionation, offers an alternative. It utilizes base-catalyzed methylation to derivatize only lipids, not free fatty acids, and found glycolipid and neutral lipid fractions are scarcely present in most bacteria, allowing lipid fractionation to be skipped. ELFA method showed a high correlation to PLFA data (r = 0.99) and higher sensitivity than the PLFA method by 1.5-2.57-fold, mainly due to the higher recovery of lipids, which was 1.5-1.9 times higher than with PLFA. The theoretical limit of detection (LOD) and limit of quantification (LOQ) for the ELFA method indicated that 1.54-fold less sample was needed for analysis than with the PLFA method. Our analysis of three bacterial cultures and a simulated consortium revealed the effectiveness of the ELFA method by its simple procedure and enhanced sensitivity for detecting strain-specific markers, which were not detected in PLFA analysis. Overall, this method could be easily used for the population analysis of synthetic consortia.


Asunto(s)
Ésteres , Ácidos Grasos , Fosfolípidos , Ácidos Grasos/análisis , Ácidos Grasos/química , Fosfolípidos/análisis , Fosfolípidos/química , Ésteres/análisis , Ésteres/química , Bacterias/metabolismo , Límite de Detección
3.
Bioprocess Biosyst Eng ; 45(10): 1719-1729, 2022 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-36121506

RESUMEN

Polyhydroxybutyrate (PHB) is a bio-based, biodegradable and biocompatible plastic that has the potential to replace petroleum-based plastics. Lignocellulosic biomass is a promising feedstock for industrial fermentation to produce bioproducts such as polyhydroxybutyrate (PHB). However, the pretreatment processes of lignocellulosic biomass lead to the generation of toxic byproducts, such as furfural, 5-HMF, vanillin, and acetate, which affect microbial growth and productivity. In this study, to reduce furfural toxicity during PHB production from lignocellulosic hydrolysates, we genetically engineered Cupriavidus necator NCIMB 11599, by inserting the nicotine amide salvage pathway genes pncB and nadE to increase the NAD(P)H pool. We found that the expression of pncB was the most effective in improving tolerance to inhibitors, cell growth, PHB production and sugar consumption rate. In addition, the engineered strain harboring pncB showed higher PHB production using lignocellulosic hydrolysates than the wild-type strain. Therefore, the application of NAD salvage pathway genes improves the tolerance of Cupriavidus necator to lignocellulosic-derived inhibitors and should be used to optimize PHB production.


Asunto(s)
Cupriavidus necator , Petróleo , Amidas/metabolismo , Cupriavidus necator/genética , Cupriavidus necator/metabolismo , Azúcares de la Dieta/metabolismo , Azúcares de la Dieta/farmacología , Furaldehído/farmacología , Inhibidores de Crecimiento/metabolismo , Inhibidores de Crecimiento/farmacología , Hidroxibutiratos/metabolismo , Lignina , NAD/metabolismo , NAD/farmacología , Nicotina/metabolismo , Nicotina/farmacología , Nitrobencenos , Petróleo/metabolismo , Plásticos
4.
Int J Mol Sci ; 23(2)2022 Jan 10.
Artículo en Inglés | MEDLINE | ID: mdl-35054904

RESUMEN

Radioactive isotopes are used as drugs or contrast agents in the medical field after being conjugated with chelates such as DOTA, NOTA, DTPA, TETA, CyDTA, TRITA, and DPDP. The N-terminal sequence of human serum albumin (HSA) is known as a metal binding site, such as for Co2+, Cu2+, and Ni2+. For this study, we designed and synthesized wAlb12 peptide from the N-terminal region of HSA, which can bind to cobalt, to develop a peptide-based chelate. The wAlb12 with a random coil structure tightly binds to the Co(II) ion. Moreover, the binding property of wAlb12 toward Co(II) was confirmed using various spectroscopic experiments. To identify the binding site of wAlb12, the analogs were synthesized by alanine scanning mutagenesis. Among them, H3A and Ac-wAlb12 did not bind to Co(II). The analysis of the binding regions confirmed that the His3 and α-amino group of the N-terminal region are important for Co(II) binding. The wAlb12 bound to Co(II) with Kd of 75 µM determined by isothermal titration calorimetry when analyzed by a single-site binding model. For the use of wAlb12 as a chelate in humans, its cytotoxicity and stability were investigated. Trypsin stability showed that the wAlb12 - Co(II) complex was more stable than wAlb12 alone. Furthermore, the cell viability analysis showed wAlb12 and wAlb12 + Co(II) to be non-toxic to the Raw 264.7 and HEK 293T cell lines. Therefore, a hot radioactive isotope such as cobalt-57 will have the same effect as a stable isotope cobalt. Accordingly, we expect wAlb12 to be used as a peptide chelate that binds with radioactive isotopes.


Asunto(s)
Quelantes/metabolismo , Cobalto/metabolismo , Péptidos/metabolismo , Albúmina Sérica Humana/metabolismo , Sustitución de Aminoácidos , Animales , Sitios de Unión , Supervivencia Celular , Quelantes/química , Cromatografía Líquida de Alta Presión , Cobalto/química , Humanos , Cinética , Ratones , Péptidos/química , Unión Proteica , Estabilidad Proteica , Células RAW 264.7 , Análisis Espectral , Relación Estructura-Actividad
5.
Biotechnol Bioeng ; 118(1): 82-93, 2021 01.
Artículo en Inglés | MEDLINE | ID: mdl-32880907

RESUMEN

Bacterial biofilm formation causes serious problems in various fields of medical, clinical, and industrial settings. Antibiotics and biocide treatments are typical methods used to remove bacterial biofilms, but biofilms are difficult to remove effectively from surfaces due to their increased resistance. An alternative approach to treatment with antimicrobial agents is using biofilm inhibitors that regulate biofilm development without inhibiting bacterial growth. In the present study, we found that linoleic acid (LA), a plant unsaturated fatty acid, inhibits biofilm formation under static and continuous conditions without inhibiting the growth of Pseudomonas aeruginosa. LA also influenced the bacterial motility, extracellular polymeric substance production, and biofilm dispersion by decreasing the intracellular cyclic diguanylate concentration through increased phosphodiesterase activity. Furthermore, quantitative gene expression analysis demonstrated that LA induced the expression of genes associated with diffusible signaling factor-mediated quorum sensing that can inhibit or induce the dispersion of P. aeruginosa biofilms. These results suggest that LA is functionally and structurally similar to a P. aeruginosa diffusible signaling factor (cis-2-decenoic acid) and, in turn, act as an agonist molecule in biofilm dispersion.


Asunto(s)
Biopelículas/efectos de los fármacos , Ácidos Grasos Monoinsaturados/metabolismo , Ácido Linoleico/farmacología , Pseudomonas aeruginosa/fisiología , Percepción de Quorum/efectos de los fármacos , Transducción de Señal/efectos de los fármacos , Biopelículas/crecimiento & desarrollo
6.
Qual Life Res ; 30(4): 1083-1092, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-33175308

RESUMEN

OBJECTIVES: Elderly living alone in South Korea report higher rates of psychological distress compared to the population at large. Using a person-centered approach, the aim of the present study was to identify the latent profiles of South Korean elderly living alone based on self-esteem, life satisfaction, and depression. METHOD: Latent profile analysis (LPA) was conducted based on data of 1545 older age individuals living alone. In addition, we examined significant factors that differentiate the observed profiles using multinomial logistic regression analysis. RESULTS: We identified five profiles: "extremely depressed (n = 44, 2.9%)," "severely depressed (n = 169, 10.9%)," "mildly depressed (n = 529, 34.2%)," "low life satisfaction (n = 128, 8.3%)," and "positive adaptation (n = 675, 43.7%)." In addition, results of multinomial logistic regression analysis indicated that males (OR: 1.69; 95% CI: 1.02-2.81), and elderly with lower income (OR: 0.86; 95% CI: 0.81-0.91), lower level of physical health (OR: 0.43; 95% CI: 0.33-0.57), and lower social relationship satisfaction (OR: 0.25; 95% CI: 0.18-0.35) were more likely to fall in the "low life satisfaction" rather than the "positive adaptation" profile. In addition, being female (OR: 0.48; 95% CI: 0.30-0.79), of older age (OR: 1.04; 95% CI: 1.01-.1.07), and higher income (OR: 1.14; 95% CI: 1.08-1.20) were related to classification in the "mildly depressed" rather than the "low life satisfaction" profile. The "severely depressed" group was differentiated by older age (OR: 1.05; 95% CI: 1.01-1.08), lower level of physical health (OR: 0.49; 95% CI: 0.34-0.71), and lower satisfaction with social relationship (OR: 0.54; 95% CI: 0.38-0.76). CONCLUSION: The results highlight the need for welfare policies that secure income and physical health in elderly living alone to enhance their quality of life. Furthermore, interventions that aim to maintain social networks are tantamount in order to prevent isolation in the elderly living alone.


Asunto(s)
Depresión/psicología , Composición Familiar/etnología , Satisfacción Personal , Pobreza/estadística & datos numéricos , Calidad de Vida/psicología , Autoimagen , Anciano , Femenino , Humanos , Masculino , República de Corea
7.
Molecules ; 26(11)2021 May 26.
Artículo en Inglés | MEDLINE | ID: mdl-34073450

RESUMEN

We report column material for a 68Ge/68Ga generator with acid resistance and excellent adsorption and desorption capacity of 68Ge and 68Ga, respectively. Despite being a core element of the 68Ge/68Ga generator system, research on this has been insufficient. Therefore, we synthesized a low molecular chitosan-based TiO2 (LC-TiO2) adsorbent via a physical trapping method as a durable 68Ge/68Ga generator column material. The adsorption/desorption studies exhibited a higher separation factor of 68Ge/68Ga in the concentration range of HCl examined (0.01 M to 1.0 M). The prepared LC-TiO2 adsorbent showed acid resistance capabilities with >93% of 68Ga elution yield and 1.6 × 10-4% of 68Ge breakthrough. In particular, the labeling efficiency of DOTA and NOTA, by using the generator eluted 68Ga, was quite encouraging and confirmed to be 99.65 and 99.69%, respectively. Accordingly, the resulting behavior of LC-TiO2 towards 68Ge/68Ga adsorption/desorption capacity and stability with aqueous HCl exhibited a high potential for ion-exchange solid-phase extraction for the 68Ge/68Ga generator column material.

8.
J Labelled Comp Radiopharm ; 63(4): 174-182, 2020 04.
Artículo en Inglés | MEDLINE | ID: mdl-31975483

RESUMEN

Imatinib (Gleevec) is a multiple tyrosine kinase inhibitor that decreases the activity of the fusion oncogene called BCR-ABL (breakpoint cluster region protein-Abelson murine leukemia viral oncogene homolog) and is clinically used for the treatment of chronic myelogenous leukemia and acute lymphocytic leukemia. Small molecule drugs, such as imatinib, can bind to several cellular proteins including the target proteins in the cells, inducing undesirable effects along with the effects against the disease. In this study, we report the synthetic optimization for 14 C-labeling and radiosynthesis of [14 C]imatinib to analyze binding with cellular proteins using accelerator mass spectroscopy. 14 C-labeling of imatinib was performed by the synthesis of 14 C-labeld 2-aminopyrimidine intermediate using [14 C]guanidine·HCl, which includes an in situ reduction of an inseparable byproduct for easy purification by HPLC, followed by a cross-coupling reaction with aryl bromide precursor. The radiosynthesis of [14 C]imatinib (specific activity, 631 MBq/mmol; radiochemical purity, 99.6%) was achieved in six steps with a total chemical yield of 29.2%.


Asunto(s)
Radioisótopos de Carbono/química , Mesilato de Imatinib/síntesis química , Inhibidores de Proteínas Quinasas/síntesis química , Proteínas Tirosina Quinasas/antagonistas & inhibidores , Animales , Humanos , Mesilato de Imatinib/química , Marcaje Isotópico , Inhibidores de Proteínas Quinasas/química , Radioquímica
9.
J Environ Manage ; 270: 110909, 2020 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-32721343

RESUMEN

This review summarizes the recent development and studies of anaerobic membrane bioreactor (AnMBR) to control fouling issues. AnMBR is an emerging waste water treatment technology mainly because of its low sludge residual, high volumetric organic removal rate, complete liquid-solid separation, better effluent quality, efficient resource recovery and the small footprint. This paper surveys the fundamental aspects of AnMBRs, including its applications, membrane configurations, and recent progress for enhanced reactor performance. Furthermore, the membrane fouling, a major restriction in the practical application of AnMBR, its mechanism and antifouling strategies like membrane cleaning, quorum quenching, ultrasonic treatment, membrane modifications, and antifouling agents are briefly discussed. Based on the review, the key issues that require urgent attention to facilitate large scale and integrated application of AnMBR technology are identified and future research perspectives relating to the prevalent issues are proposed.


Asunto(s)
Reactores Biológicos , Purificación del Agua , Anaerobiosis , Membranas Artificiales , Aguas del Alcantarillado , Eliminación de Residuos Líquidos , Aguas Residuales
10.
Molecules ; 25(12)2020 Jun 25.
Artículo en Inglés | MEDLINE | ID: mdl-32630467

RESUMEN

In this study, we investigated the tumor targeting effect in cancer cells using triphenylphosphonium (TPP) cations, which are accumulated by differences in membrane potential, and folic acid (FA), which is selectively bound to overexpressed receptors on various cancer cells. We used Food and Drug Administration (FDA)-approved silica nanoparticles (SNPs) as drug carriers, and SNPs conjugated with TPP and FA (STFs) samples were prepared by introducing different amounts of TPP and FA onto the nanoparticle surfaces. STF-1, 2, 3, 4 and 5 are named according to the combination ratio of TPP and FA on the particle surface. To confirm the tumor targeting effect, 89Zr (t1/2 = 3.3 days) was coordinated directly to the silanol group of SNP surfaces without chelators. It was shown that the radiochemical yield was 69% and radiochemical purity was >99%. In the cellular uptake evaluation, SNPs with the most TPP (SFT-5) and FA (SFT-1) attached indicated similar uptake tendencies for mouse colon cancer cells (CT-26). However, the results of the cell internalization assay and measurement of positron emission tomography (PET) images showed that SFT-5 had more affinity for the CT-26 tumor than other samples the TPP ratio of which was lower. Consequently, we confirmed that TPP ligands affect target cancer cells more than FA, which means that cell membrane potential is significantly effective for tumor targeting.


Asunto(s)
Neoplasias del Colon/tratamiento farmacológico , Ácido Fólico/química , Nanopartículas/administración & dosificación , Compuestos Organofosforados/química , Radioisótopos/química , Radiofármacos/química , Dióxido de Silicio/química , Circonio/química , Animales , Cationes , Neoplasias del Colon/diagnóstico por imagen , Neoplasias del Colon/metabolismo , Neoplasias del Colon/patología , Femenino , Humanos , Ratones , Ratones Endogámicos BALB C , Nanopartículas/química , Tomografía de Emisión de Positrones
11.
Psychogeriatrics ; 20(6): 880-890, 2020 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-32840032

RESUMEN

BACKGROUND: Although depression is very common in patients with Parkinson disease (PD), only a few studies have investigated the longitudinal effects of initial depression on cognitive decline in these patients. The purpose of this study was to investigate the effect of depression on cognitive functions in patients with PD. METHODS: We used data from the Parkinson Progression Markers Initiative (PPMI) to investigate the relationship between depression and PD. Depressive symptoms were measured in patients with PD based on the Geriatric Depression Scale (GDS) or Neuropsychiatric Inventory-Questionnaire (NPI-Q) scores obtained at baseline. We evaluated cognitive decline as whether a patient with PD progressed to PD with mild cognitive impairment (MCI) during a 4-year follow-up period. Multivariate Cox regression analysis was done to know whether depression can predict the conversion to MCI. In addition, a voxel-based morphometric analysis using volumetric brain magnetic resonance imaging was used to compare structural changes related to future cognitive decline as well as to reveal longitudinal effect of baseline depression on cortical atrophy. RESULTS: Data from 263 patients with cognitively normal de novo PD who were available for longitudinal cognitive testing were analysed. The multivariate Cox regression analysis revealed that the depressive symptoms were independent risk factors for conversion to MCI in patients with de novo PD after adjusting for covariates (hazards ratio (95% CI)) of depression defined by the GDS (1.753 (1.084-2.835)) and the NPI (1.815 (1.083-3.042)) scores, respectively. The significant structural changes in PD with MCI as well as longitudinal effect of baseline depression on subsequent cortical atrophy were found in multiple areas on the voxel-based morphometric analysis (P < 0.001, family-wise error rate corrected). CONCLUSIONS: Our study indicates that the presence of depressive symptoms in patients with early PD is associated with a higher risk of progression to MCI and early depression may reflect subsequent cortical atrophy.


Asunto(s)
Disfunción Cognitiva/complicaciones , Disfunción Cognitiva/diagnóstico , Depresión/complicaciones , Depresión/psicología , Enfermedad de Parkinson/complicaciones , Enfermedad de Parkinson/diagnóstico , Cognición , Disfunción Cognitiva/psicología , Depresión/diagnóstico , Progresión de la Enfermedad , Femenino , Humanos , Masculino , Persona de Mediana Edad , Pruebas Neuropsicológicas , Enfermedad de Parkinson/psicología , Pronóstico
12.
Environ Res ; 172: 34-42, 2019 05.
Artículo en Inglés | MEDLINE | ID: mdl-30769187

RESUMEN

Singlet oxygen produced by irradiating photosensitizers (PSs) can be used to kill pathogens during water treatment. Chemical immobilization of the PSs on surfaces can maintain their disinfection function long-term. In this study, two model PSs (rose bengal (RB) and hematoporphyrin (HP)) were immobilized on a glass surface using a silane coupling agent with an epoxide group, and their antibacterial properties were analyzed. Fourier transform infrared spectroscopy demonstrated that a covalent bond formed between the epoxide group and hydroxyl group in the PSs. A large proportion of the immobilized PSs (approximately 50%) was active in singlet oxygen production, which was evidenced by a comparative analysis with free PSs. RB was more effective at producing singlet oxygen than HP. The immobilized PSs were durable in terms of repeated use. On the other hand, singlet oxygen produced by the PSs was effective at killing bacteria, mostly for Gram-positive bacteria (> 90% death for 2 h of irradiation), by damaging the cell membrane. The preferable antibacterial property against Gram-positive bacteria compared with that against Gram-negative bacteria suggested efficient penetrability of singlet oxygen across the cell membrane, which led to cell death. Taken together, it was concluded that immobilization of PSs on surfaces using the silane coupling agent proposed in this study was effective at killing Gram-positive bacteria by forming singlet oxygen.


Asunto(s)
Antibacterianos , Desinfección , Fármacos Fotosensibilizantes , Antibacterianos/química , Bacterias/efectos de los fármacos , Desinfección/métodos , Hematoporfirinas/química , Hematoporfirinas/farmacología , Fármacos Fotosensibilizantes/química , Rosa Bengala/química , Rosa Bengala/farmacología , Oxígeno Singlete/química , Oxígeno Singlete/farmacología , Propiedades de Superficie
13.
Bioorg Med Chem Lett ; 28(23-24): 3658-3664, 2018 12 15.
Artículo en Inglés | MEDLINE | ID: mdl-30528977

RESUMEN

Heat-shock protein 90 (HSP90) is a molecular chaperone that activates oncogenic transformation in several solid tumors, including lung and breast cancers. Ganetespib, a most promising candidate among several HSP90 inhibitors under clinical trials, has entered Phase III clinical trials for cancer therapy. Despite numerous evidences validating HSP90 as a target of anticancer, there are few studies on PET agents targeting oncogenic HSP90. In this study, we synthesized and biologically evaluated a novel 18F-labeled 5-resorcinolic triazolone derivative (1, [18F]PTP-Ganetespib) based on ganetespib. [18F]PTP-Ganetespib was labeled by click chemistry of Ganetespib-PEG-Alkyne (10) and [18F]PEG-N3 (11) with 37.3 ±â€¯5.11% of radiochemical yield and 99.7 ±â€¯0.09% of radiochemical purity. [18F]PTP-Ganetespib showed proper LogP (0.96 ±â€¯0.06) and good stability in human serum over 97% for 2 h. [18F]PTP-Ganetespib showed high uptakes in breast cancer cells containing triple negative breast cancer (TNBC) MDA-MB-231 and Her2-negative MCF-7 cells, which are target breast cancer cell lines of HSP90 inhibitor, ganetespib, as an anticancer. Blocking of HSP90 by the pretreatment of ganetespib exhibited significantly decreased accumulation of [18F]PTP-Ganetespib in MDA-MB-231 and MCF-7 cells, indicating the specific binding of [18F]PTP-Ganetespib to MDA-MB-231 and MCF-7 cells with high HSP90 expression. In the biodistribution and microPET imaging studies, the initial uptake into tumor was weaker than in other thoracic and abdominal organs, but [18F]PTP-Ganetespib was retained relatively longer in the tumor than other organs. The uptake of [18F]PTP-Ganetespib in tumors was not sufficient for further development as a tumor-specific PET imaging agent by itself, but this preliminary PET imaging study of [18F]PTP-Ganetespib can be basis for developing new PET imaging agents based on HSP90 inhibitor, ganetespib.


Asunto(s)
Proteínas HSP90 de Choque Térmico/metabolismo , Radiofármacos/síntesis química , Triazoles/química , Animales , Sitios de Unión , Línea Celular Tumoral , Química Clic , Cristalografía por Rayos X , Estabilidad de Medicamentos , Radioisótopos de Flúor/química , Proteínas HSP90 de Choque Térmico/química , Humanos , Ratones , Ratones Desnudos , Simulación del Acoplamiento Molecular , Tomografía de Emisión de Positrones , Radiofármacos/sangre , Radiofármacos/metabolismo , Distribución Tisular , Trasplante Heterólogo , Triazoles/sangre , Triazoles/metabolismo
14.
Bioorg Med Chem Lett ; 28(5): 915-921, 2018 03 01.
Artículo en Inglés | MEDLINE | ID: mdl-29422388

RESUMEN

Carbonic anhydrase IX is overexpressed in many solid tumors including hypoxic tumors and is a potential target for cancer therapy and diagnosis. Reported imaging agents targeting CA-IX are successful mostly in clear cell renal carcinoma as SKRC-52 and no candidate was approved yet in clinical trials for imaging of CA-IX. To validate CA-IX as a valid target for imaging of hypoxic tumor, we designed and synthesized novel [18F]-PET tracer (1) based on acetazolamide which is one of the well-known CA-IX inhibitors and performed imaging study in CA-IX expressing hypoxic tumor model as 4T1 and HT-29 in vivo models other than SKRC-52. [18F]-acetazolamide (1) was found to be insufficient for the specific accumulation in CA-IX expressing tumor. This study might be useful to understand in vivo behavior of acetazolamide PET tracer and can contribute to the development of successful PET imaging agents targeting CA-IX in future. Additional study is needed to understand the mechanism of poor targeting of CA-IX, as if CA-IX is not reliable as a sole target for imaging of CA-IX expressing hypoxic solid tumors.


Asunto(s)
Acetazolamida/química , Anhidrasa Carbónica IX/análisis , Inhibidores de Anhidrasa Carbónica/química , Carcinoma de Células Renales/enzimología , Neoplasias Renales/enzimología , Tomografía de Emisión de Positrones , Acetazolamida/síntesis química , Acetazolamida/farmacocinética , Animales , Anhidrasa Carbónica IX/biosíntesis , Anhidrasa Carbónica IX/metabolismo , Inhibidores de Anhidrasa Carbónica/síntesis química , Inhibidores de Anhidrasa Carbónica/farmacocinética , Carcinoma de Células Renales/diagnóstico , Radioisótopos de Flúor , Humanos , Neoplasias Renales/diagnóstico , Ratones , Ratones Endogámicos BALB C , Neoplasias Experimentales/diagnóstico , Neoplasias Experimentales/enzimología , Distribución Tisular
15.
J Nanosci Nanotechnol ; 18(9): 6532-6535, 2018 09 01.
Artículo en Inglés | MEDLINE | ID: mdl-29677828

RESUMEN

Copper indium gallium selenide (CIGS) thin film solar cells have been regarded as a candidate for energy conversion devices owing to their high absorption coefficient, high temperature stability, and low cost. ZnO:Al thin film is commonly used in CIGS solar cells as a window layer. In this study, ZnO:Al films were deposited on glass under various post-heat temperature using RF sputtering to observe the characteristics of ZnO:Al films such as Hall mobility, carrier concentration, and resistivity; subsequently, the ZnO:Al films were applied to a CIGS solar cell as a window. CIGS solar cells fabricated with various ZnO:Al films were analyzed in order to investigate their influence. The test results showed that the improvement of ZnO:Al characteristics affects Jsc and Voc in the solar cell through reduced recombination and increase of optical property.

16.
J Labelled Comp Radiopharm ; 61(1): 4-10, 2018 01.
Artículo en Inglés | MEDLINE | ID: mdl-28901564

RESUMEN

The 68 Ga is a positron-emitting radionuclide that can be combined with bifunctional chelating agents and bioactive substances for use as positron-emission tomography (PET) diagnostic agents. The HBED-CC is an acyclic chelating agent that is rapidly labeled with 68 Ga under mild conditions. To target cancer cells, bioactive substances can be conjugated to the carboxyl terminus of HBED-CC. Because folic acid strongly binds to folate receptors that are overexpressed on the surfaces of many types of cancer cells, it was coupled with HBED-CC through a small polyethylene glycol-based linker (EDBE) to generate an active, receptor-selective targeting system. The HBED-CC-EDBE-folate (HCEF) precursor was readily labeled with 68 Ga in 5 minutes at room temperature (98% radiochemical yield; 99% radiochemical purity after isolation). In cellular uptake tests, higher uptakes of 68 Ga-HCEF were observed for the CT26 and KB cell lines (which express folate receptors) than for the A549 cell line (which does not). Finally, in vivo micro-PET measurements over 2 hours of binding in BALB/c mice into which CT26 tumors had been transplanted showed the selective accumulation of 68 Ga-HCEF in the folate receptor-expressing CT26 tumors. These results confirmed the potential of 68 Ga-HCEF as a PET diagnostic agent for tumors that express folate receptors.


Asunto(s)
Ácido Edético/análogos & derivados , Radioisótopos de Galio/química , Neoplasias Experimentales/diagnóstico por imagen , Tomografía de Emisión de Positrones/métodos , Radiofármacos/síntesis química , Animales , Línea Celular Tumoral , Ácido Edético/química , Ácido Fólico/análogos & derivados , Humanos , Ratones , Ratones Endogámicos BALB C , Polietilenglicoles/química , Radiofármacos/farmacocinética , Distribución Tisular
17.
Ann Rheum Dis ; 76(8): 1440-1448, 2017 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-28416516

RESUMEN

OBJECTIVES: Inappropriate activation of neutrophils plays a pathological role in antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV). The aim of this study was to investigate the functions of semaphorin 4D (SEMA4D) in regulation of neutrophil activation, and its involvement in AAV pathogenesis. METHODS: Serum levels of soluble SEMA4D were evaluated by ELISA. Blood cell-surface expression of membrane SEMA4D was evaluated by flow cytometry. To determine the functional interactions between neutrophil membrane SEMA4D and endothelial plexin B2, wild-type and SEMA4D-/- mice neutrophils were cultured with an endothelial cell line (MS1) stained with SYTOX green, and subjected to neutrophil extracellular trap (NET) formation assays. The efficacy of treating human neutrophils with recombinant plexin B2 was assessed by measuring the kinetic oxidative burst and NET formation assays. RESULTS: Serum levels of soluble SEMA4D were elevated in patients with AAV and correlated with disease activity scores. Cell-surface expression of SEMA4D was downregulated in neutrophils from patients with AAV, a consequence of proteolytic cleavage of membrane SEMA4D. Soluble SEMA4D exerted pro-inflammatory effects on endothelial cells. Membranous SEMA4D on neutrophils bound to plexin B2 on endothelial cells, and this interaction decreased NET formation. Recombinant plexin B2 suppressed neutrophil Rac1 activation through SEMA4D's intracellular domain, and inhibited pathogen-induced or ANCA-induced oxidative burst and NET formation. CONCLUSIONS: Neutrophil surface SEMA4D functions as a negative regulator of neutrophil activation. Proteolytic cleavage of SEMA4D as observed in patients with AAV may amplify neutrophil-mediated inflammatory responses. SEMA4D is a promising biomarker and potential therapeutic target for AAV.


Asunto(s)
Vasculitis Asociada a Anticuerpos Citoplasmáticos Antineutrófilos/inmunología , Antígenos CD/inmunología , Células Endoteliales/inmunología , Trampas Extracelulares/inmunología , Proteínas del Tejido Nervioso/inmunología , Neutrófilos/inmunología , Semaforinas/inmunología , Adulto , Anciano , Anciano de 80 o más Años , Animales , Antígenos CD/genética , Ensayo de Inmunoadsorción Enzimática , Trampas Extracelulares/efectos de los fármacos , Femenino , Citometría de Flujo , Humanos , Masculino , Ratones , Ratones Noqueados , Persona de Mediana Edad , Proteínas del Tejido Nervioso/farmacología , Neutrófilos/efectos de los fármacos , Especies Reactivas de Oxígeno/inmunología , Estallido Respiratorio/efectos de los fármacos , Semaforinas/genética , Proteína de Unión al GTP rac1/efectos de los fármacos , Proteína de Unión al GTP rac1/inmunología
18.
J Appl Clin Med Phys ; 17(1): 49-61, 2016 01 08.
Artículo en Inglés | MEDLINE | ID: mdl-26894331

RESUMEN

The aim of this study is to develop a new method to align the patient setup lasers in a radiation therapy treatment room and examine its validity and efficiency. The new laser alignment method is realized by a device composed of both a metallic base plate and a few acrylic transparent plates. Except one, every plate has either a crosshair line (CHL) or a single vertical line that is used for alignment. Two holders for radiochromic film insertion are prepared in the device to find a radiation isocenter. The right laser positions can be found optically by matching the shadows of all the CHLs in the gantry head and the device. The reproducibility, accuracy, and efficiency of laser alignment and the dependency on the position error of the light source were evaluated by comparing the means and the standard deviations of the measured laser positions. After the optical alignment of the lasers, the radiation isocenter was found by the gantry and collimator star shots, and then the lasers were translated parallel to the isocenter. In the laser position reproducibility test, the mean and standard deviation on the wall of treatment room were 32.3 ± 0.93 mm for the new method whereas they were 33.4 ± 1.49 mm for the conventional method. The mean alignment accuracy was 1.4 mm for the new method, and 2.1 mm for the conventional method on the walls. In the test of the dependency on the light source position error, the mean laser position was shifted just by a similar amount of the shift of the light source in the new method, but it was greatly magnified in the conventional method. In this study, a new laser alignment method was devised and evaluated successfully. The new method provided more accurate, more reproducible, and faster alignment of the lasers than the conventional method.


Asunto(s)
Rayos Láser/normas , Neoplasias/radioterapia , Aceleradores de Partículas/instrumentación , Planificación de la Radioterapia Asistida por Computador/métodos , Errores de Configuración en Radioterapia/prevención & control , Humanos , Radioterapia de Intensidad Modulada
19.
Aging Cell ; : e14304, 2024 Aug 09.
Artículo en Inglés | MEDLINE | ID: mdl-39123277

RESUMEN

In recent years, there has been increasing attention towards understanding the relationship between age-related alterations in the oral microbiota and age-associated diseases, with reports emphasizing the significance of maintaining a balanced oral microbiota for host health. However, the precise mechanisms underlying age-related changes in the oral microbiota remain elusive. We recently reported that cellular senescence of ileal germinal center (GC) B cells, triggered by the persistent presence of commensal bacteria, results in diminished IgA production with aging and subsequent alterations in the gut microbiota. Consequently, we hypothesize that a similar phenomenon may occur in the oral cavity, potentially contributing to age-related changes in the oral microbiota. Examination of p16-luc mice, wherein the expression of the senescent cell marker p16INK4a can be visualized, raised under specific pathogen-free (SPF) or germ-free (GF) conditions, indicated that, unlike ileal GC B cells, the accumulation of senescent cells in GC B cells of cervical lymph nodes increases with age regardless of the presence of commensal bacteria. Furthermore, longitudinal studies utilizing the same individual mice throughout their lifespan revealed concurrent age-related alterations in the composition of the oral microbiota and a decline in salivary IgA secretion. Further investigation involving Rag1-/- mice transplanted with B cells from wild-type or p16INK4a and p21Waf1/Cip1 -double knockout mice unveiled that B cell senescence leads to reduced IgA secretion and alteration of the oral microbiota. These findings advance our understanding of the mechanism of age-associated changes in the oral microbiota and open up possibilities of their control.

20.
J Control Release ; 365: 703-715, 2024 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-38016489

RESUMEN

Recently, CRISPR proteins have been recognized as promising candidates for drug development. However, there is still a lack of substances with the appropriate sensitivity and stability for targeted drug delivery systems. 89Zr is a radioactive isotope that emits positrons, allowing real-time in vivo tracking with proven safety. In this study, we confirmed that labeling with 89Zr did not compromise the functionality of CRISPR proteins during in vivo behavioral imaging. Furthermore, we demonstrated the therapeutic efficacy of the CRISPR interference system in a mouse model of liver fibrosis, highlighting the theragnostic potential of isotope-labeled CRISPR proteins. The findings of this research could contribute to various aspects of ongoing clinical studies exploring the in vivo applications of CRISPR proteins.


Asunto(s)
Repeticiones Palindrómicas Cortas Agrupadas y Regularmente Espaciadas , Tomografía de Emisión de Positrones , Ratones , Animales , Tomografía de Emisión de Positrones/métodos , Circonio , Radioisótopos , Distribución Tisular , Marcaje Isotópico
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