RESUMEN
The industrial production of methanol through CO hydrogenation using the Cu/ZnO/Al2O3 catalyst requires harsh conditions, and the development of new catalysts with low operating temperatures is highly desirable. In this study, organic biomimetic FLP catalysts with good tolerance to CO poison are theoretically designed. The base-free catalytic reaction contains the 1,1-addition of CO into a formic acid intermediate and the hydrogenation of the formic acid intermediate into methanol. Low-energy spans (25.6, 22.1, and 20.6 kcal/mol) are achieved, indicating that CO can be hydrogenated into methanol at low temperatures. The new extended aromatization-dearomatization effect involving multiple rings is proposed to effectively facilitate the rate-determining CO 1,1-addition step, and a new CO activation model is proposed for organic catalysts.
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A brand-new enhanced starvation is put forward to trigger sensitized chemotherapy: blocking tumor-relation blood vessel formation and accelerating nutrient degradation and efflux. Following this concept, two cisplatin-like gemfibrozil-derived Pt(IV) prodrugs, GP and GPG, are synthesized. GP and GPG had nanomolar IC50 against A2780 cells and higher selectivity against normal cells than cisplatin. Bioactivity results confirmed that GP and GPG highly accumulated in cells and induced DNA damage, G2-phase arrest, and p53 expression. Besides, they could increase ROS and MDA levels and reduce mitochondrial membrane potential and Bcl-2 expression to promote cell apoptosis. In vivo, GP showed superior antitumor activity in A2780 tumor-bearing mice with no observable tissue damage. Mechanistic studies suggested that highly selective chemotherapy could be due to the new enhanced starvation effect: blocking vasculature formation via inhibiting the CYP2C8/EETs pathway and VEGFR2, NF-κB, and COX-2 expression and cholesterol efflux and degradation acceleration via increasing ABCA1 and PPARα.
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Antineoplásicos , Gemfibrozilo , Animales , Humanos , Ratones , Antineoplásicos/farmacología , Antineoplásicos/química , Antineoplásicos/síntesis química , Apoptosis/efectos de los fármacos , Línea Celular Tumoral , Gemfibrozilo/farmacología , Ratones Endogámicos BALB C , Compuestos Organoplatinos/farmacología , Compuestos Organoplatinos/química , Profármacos/farmacología , Profármacos/química , Profármacos/síntesis químicaRESUMEN
The pre-transmetalation intermediates are critically important in Suzuki-Miyaura cross-coupling (SMC) reactions and have become a hot spot of the current research. However, the pre-transmetalation intermediates under base-free conditions have not been clear. Herein, a comprehensive theoretical study is performed on the base-free Pd-catalyzed desulfonative SMC reaction. The fragile coordination feature and the acceleration role of the RuPhos chelate ligand are revealed. The hydrogen-bond complex between the Pd-F complex and aryl boronic acid is identified as an important pre-transmetalation intermediate, which increases the energy span to 32.5 kcal/mol. The controlling factor for the formation of the hydrogen-bond complexes is attributed to the electronegativities of halogen atoms in the metal halide complexes. What is more, other reported SMC reaction systems involving metal halide complexes and aryl boronic acids are reconsidered and suggest that the hydrogen-bond complexes widely exist as stable pre-transmetalation intermediates with influencing the catalytic activities. The earth-abundant Ni-catalyzed desulfonative SMC reaction is further designed and predicted to have a higher activity than the original Pd-catalyzed SMC reaction.
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Physical exercise has been shown to have an impact on memory and hippocampal function across different age groups. Nevertheless, the influence and mechanisms underlying how voluntary exercise during puberty affects memory are still inadequately comprehended. This research aims to examine the impacts of self-initiated physical activity throughout adolescence on spatial memory. Developing mice were exposed to a 4-wk voluntary wheel running exercise protocol, commencing at the age of 30 d. After engaging in voluntary wheel running exercise during development, there was an enhancement in spatial memory. Moreover, hippocampal dentate gyrus and CA3 neurons rather than CA1 neurons exhibited an increase in the miniature excitatory postsynaptic currents and miniature inhibitory postsynaptic currents. In addition, there was an increase in the expression of NR2A/NR2B subunits of N-methyl-D-aspartate receptors and α1GABAA subunit of gamma-aminobutyric acid type A receptors, as well as dendritic spine density, specifically within dentate gyrus and CA3 regions rather than CA1 region. The findings suggest that voluntary exercise during development can enhance spatial memory in mice by increasing synapse numbers and improving synaptic transmission in hippocampal dentate gyrus and CA3 regions, but not in CA1 region. This study sheds light on the neural mechanisms underlying how early-life exercise improves cognitive function.
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Giro Dentado , Memoria Espacial , Ratones , Animales , Giro Dentado/metabolismo , Actividad Motora , Maduración Sexual , Hipocampo/metabolismo , Transmisión Sináptica/fisiologíaRESUMEN
The asymmetric unit in the title salt, (C8H20N)2[SnCl4(C7H4Cl2F3)2], features a di-isobutyl-ammonium cation in a general position and a diorganotin tetra-chloride dianion, i.e. tetra-chlorido-bis-(3-trifuoro-methyl-phen-yl)stannate(IV), located on a centre of inversion; the SnIV atom is octa-hedrally coordinated. In the crystal, charge-assisted N+-Hâ¯Cl hydrogen bonds along with C-Hâ¯F contacts occur within supra-molecular layers that inter-digitate along the a-axis direction.
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N-(5-Cyano-nonan-5-yl)benzamide, C17H24N2O, synthesized from the reaction between benzoyl chloride and 2-amino-2-butyl-hexa-nenitrile, is an important inter-mediate in amino acid synthesis. Inter-molecular N-Hâ¯O and C-Hâ¯O hydrogen bonds with Nâ¯O and Câ¯O distances of 3.083â (2) and 3.304â (2)â Å, respectively, link adjacent mol-ecules into chains along the a axis. The dihedral angle between the mean plane of the phenyl group and the plane of the amide group is 19.504â (4)°.
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An organocatalyzed asymmetric synthesis of fused butyrolactones via formal [2 + 2 + 2] annulation between γ-butenolides, methylene indolinones, and nitroolefins in a one-pot process has been established. Products containing six contiguous stereocenters could be obtained in good yields (up to 95%) with excellent enantioselectivities (up to >99% ee) catalyzed by a l-tert-leucine-derived bifunctional thiourea catalyst.
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4-Butirolactona , Tiourea , 4-Butirolactona/análogos & derivados , Oxindoles , EstereoisomerismoRESUMEN
Pt(IV) anticancer compounds have been developed for several decades to overcome the drawbacks of their Pt(II) congeners, and the reduction of Pt(IV) to Pt(II) has been commonly regarded as a necessary step in the activation of Pt(IV) compounds prior to targeting DNA. However, blockage of glutathione (GSH) biosynthesis resulted in a slight effect on the cytotoxicity of oxoplatin in yeast Saccharomyces cerevisiae strains, urging us to reconsider the mechanism of actions for the "inert" Pt(IV) complexes. Using X-ray absorption near-edge spectroscopy (XANES), our data demonstrated that Pt(IV) complex oxoplatin could bind to DNA in a tetravalent state. Both alkaline denaturing agarose electrophoresis and thermal denaturation-renaturation assay revealed that oxoplatin could rapidly produce stable interstrand crosslinks (ICLs), which can further translate into a fast cell-killing process in cancer cells. Using quantitative real-time PCR and immunofluorescence analysis, we also proved that Pt(IV) complex oxoplatin could induce a quick intracellular response of the FA/BRCA pathway in cancer cells that involves the DNA interstrand crosslinking repair system, and this quick response to ICLs was independent with the intracellular GSH levels. Cell cycle analysis showed that short incubation with oxoplatin can induce a strong S phase arrest in HeLa cells, indicating that the rapid interstrand crosslinks produced by oxoplatin might stall the replication fork, result in the double-strand breaks, and eventually induce cell death. Our results implied that, besides the reduction mechanism to release the Pt(II) congeners, direct and rapid interstrand cross-linking with DNA by Pt(IV) compounds might be a unique mechanism for Pt(IV) compounds, which may provide new insight for the development of next-generation platinum-based drugs.
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Antineoplásicos , ADN , Antineoplásicos/química , Antineoplásicos/farmacología , Reactivos de Enlaces Cruzados/química , Reactivos de Enlaces Cruzados/farmacología , ADN/metabolismo , Daño del ADN , Reparación del ADN , Glutatión , Células HeLa , HumanosRESUMEN
Objective: Cognitive symptoms are associated with significant dysfunction in schizophrenia. Oxidative stress and inflammation involving histone deacetylase (HDAC) have been implicated in the pathophysiology of schizophrenia. Sulforaphane has antioxidant properties and is an HDAC inhibitor. The objective of this study was to determine the efficacy of sulforaphane on cognition dysfunction for patients with schizophrenia. Methods: This double-blind randomized 22-week trial of patients with first-episode schizophrenia was conducted in four psychiatric institutions in China. Patients were randomized to three groups (two doses of sulforaphane vs. placebo) and symptomatic and cognitive assessments were completed at multiple times. The primary outcome measure was change in the MATRICS Composite score. The secondary outcomes were change in MATRICS Domain scores, PANSS Total Scores and change in side-effects. Results: A total of 172 patients were randomized and 151 patients had at least one follow up evaluation. There were no significant effects of sulforaphane, on the primary outcome, MATRICS overall composite score. However, on secondary outcomes, sulforaphane did significantly improve performance scores on MATRICS battery Domains of spatial working memory (F = 5.68, P = 0.004), reasoning-problem solving (F = 2.82, P = 0.063), and verbal learning (F = 3.56, P = 0.031). There were no effects on PANSS symptom scores. Sulforaphane was well tolerated. Conclusion: Although the primary outcome was not significant, improvement in three domains of the MATRICS battery, suggests a positive cognitive effect on some cognitive functions, which warrants further clinical trials to further assess whether sulforaphane may be a useful adjunct for treating some types of cognitive deficits in schizophrenia.
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Triple-negative breast cancer (TNBC) shares the molecular features facilitating epithelial-to-mesenchymal transition (EMT), which contributed to tumor invasion and metastasis. A platinum(IV) conjugate ketoplatin deriving from FDA-approved drugs cisplatin and ketoprofen was designed and prepared to enhance antitumor activity and suppress EMT in TNBC via positive impact on inflammatory microenvironment by modulating COX-2 signal. As a prodrug, ketoplatin afforded 50.26-fold higher cytotoxicity than cisplatin against TNBC mesenchymal-stem cell-like MDA-MB-231 cells, partly attributing to its dramatic increase of cellular uptake and DNA damage. More importantly, EMT progress in MDA-MB-231 was markedly restrained by ketoplatin, resulting from the suppression of vimentin and N-cadherin mediated by down-regulated COX-2. Further in vivo investigation exhibited that ketoplatin effectively inhibited tumor growth and reduced systemic toxicity compared to cisplatin. Overall, ketoplatin possessed high antitumor activity and low toxicity against TNBC MDA-MB-231 in vitro and in vivo.
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Antineoplásicos/administración & dosificación , Cisplatino/análogos & derivados , Cetoprofeno/administración & dosificación , Neoplasias de la Mama Triple Negativas/tratamiento farmacológico , Neoplasias de la Mama Triple Negativas/metabolismo , Microambiente Tumoral/efectos de los fármacos , Células A549 , Animales , Antiinflamatorios no Esteroideos/administración & dosificación , Antiinflamatorios no Esteroideos/química , Antineoplásicos/química , Cisplatino/administración & dosificación , Cisplatino/química , Transición Epitelial-Mesenquimal/efectos de los fármacos , Transición Epitelial-Mesenquimal/fisiología , Femenino , Células HeLa , Humanos , Mediadores de Inflamación/antagonistas & inhibidores , Mediadores de Inflamación/metabolismo , Cetoprofeno/análogos & derivados , Células MCF-7 , Ratones , Ratones Endogámicos BALB C , Ratones Desnudos , Resultado del Tratamiento , Neoplasias de la Mama Triple Negativas/patología , Microambiente Tumoral/fisiología , Ensayos Antitumor por Modelo de Xenoinjerto/métodosRESUMEN
A new schiff base cobalt(III) complex [N,N'-bis(2'-hydroxyphenylacetone)-o-ethanediamine] cobalt(III) (M3) has been synthesized and characterized by single X-ray crystallography. The cytotoxicity of complex M3 was evaluated against HeLa, LoVo, A549, A549/cis cancer cell lines, and the normal cell lines LO2 by MTT assays. The IC50 is in the range of 6.27-22.68 µM, which is somewhat lower than cisplatin on the basis of platinum molar concentration. Furthermore, anticancer mechanistic studies showed that the complex M3 inhibited cell proliferation by blocking DNA synthesis and then acted on nuclear division of HeLa cells over time. Moreover, western blot analysis indicated M3 dramatically decreased the target protein c-Myc and KLF5 expression levels, and activated many signaling pathways including ER stress, apoptosis, cell cycle and DNA damage in HeLa. M3 did not affect proteasomal activity.
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Antineoplásicos/farmacología , Apoptosis/efectos de los fármacos , Cobalto/farmacología , Complejos de Coordinación/farmacología , Neoplasias del Cuello Uterino/tratamiento farmacológico , Antineoplásicos/síntesis química , Antineoplásicos/química , Proliferación Celular/efectos de los fármacos , Células Cultivadas , Cobalto/química , Complejos de Coordinación/síntesis química , Complejos de Coordinación/química , Ensayos de Selección de Medicamentos Antitumorales , Femenino , Humanos , Bases de Schiff/química , Bases de Schiff/farmacología , Neoplasias del Cuello Uterino/metabolismo , Neoplasias del Cuello Uterino/patologíaRESUMEN
OBJECTIVE: To measure the situation of the non-prescription sale of antibiotics and the service quality of community pharmacies in Guangzhou, China. METHODS: A simulated client method was conducted to estimate the non-prescription sale of antibiotics and service quality based on scenarios about adult acute upper respiratory tract infection in 2019. A total of 595 community pharmacies from 11 districts were investigated in Guangzhou, China. We used binary logistic regression to evaluate the factors associated with the non-prescription sale of antibiotics. RESULTS: The proportion of non-prescription dispensing of antibiotics was 63.1% in Guangzhou, China, with a higher incidence of antibiotic dispensing without prescription in outer districts (69.3%). Cephalosporin (44.1%) and Amoxicillin (39.0%) were sold more often than other antibiotics. Chain pharmacies had better performance on the prescription sale of antibiotics and service quality. Traditional Chinese medicine was commonly recommended by pharmacy staff. CONCLUSION: Since the non-prescription sale of antibiotics is prevalent in Guangzhou, effective solutions should be determined. Strengthened public awareness and regulatory system innovation are needed.
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Antibacterianos/economía , Servicios Comunitarios de Farmacia/tendencias , Farmacias/tendencias , Amoxicilina/uso terapéutico , Antibacterianos/uso terapéutico , Cefalosporinas/uso terapéutico , China/epidemiología , Comercio , Servicios Comunitarios de Farmacia/economía , Servicios de Salud , Humanos , Farmacias/economía , Farmacéuticos/economía , Infecciones del Sistema Respiratorio/tratamiento farmacológicoRESUMEN
A new Schiff base copper(II) complex [N,N'-bis(2'-hydroxyphenylacetone)-o-ethanediamine] copper (II) (M1) has been synthesized and characterized by single X-ray crystallography. The cytotoxicity of complex M1 was evaluated against HeLa, LoVo, A549, A549/cis cancer cell lines, and the normal cell lines LO2 and HUVEC, by MTT (3-(4,5-dimethylthiazoyl-2-yl)2,5-diphenyltetrazoliumbromide) assays. The IC50 (50% inhibition concentrations) is in the range of 5.13-11.68 µM, which is somewhat lower than cisplatin on the basis of platinum molar concentration. Furthermore, anticancer mechanistic studies showed that the complex M1 inhibited cell proliferation by blocking DNA synthesis and then acted on nuclear division of HeLa cells over time. Moreover, M1 increased intracellular ROS (Reactive oxygen species) levels in a dose-dependent manner. Western blot analysis indicated M1 dramatically decrease c-Myc transcription factor and KLF5 (Krüppel-like factor 5) protein expression levels in HeLa. M1 did not inhibit proteasomal activity. Finally, M1 induced DNA damages and activated the DNA damage repair pathways.
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Antineoplásicos , Apoptosis/efectos de los fármacos , Proliferación Celular/efectos de los fármacos , Complejos de Coordinación , Cobre , Neoplasias , Células A549 , Antineoplásicos/química , Antineoplásicos/farmacocinética , Antineoplásicos/farmacología , Complejos de Coordinación/química , Complejos de Coordinación/farmacocinética , Complejos de Coordinación/farmacología , Cobre/química , Cobre/farmacocinética , Cobre/farmacología , Células HeLa , Células Endoteliales de la Vena Umbilical Humana , Humanos , Neoplasias/tratamiento farmacológico , Neoplasias/metabolismo , Neoplasias/patología , Bases de Schiff/química , Bases de Schiff/farmacocinética , Bases de Schiff/farmacologíaRESUMEN
Multitargeted therapy could rectify various oncogenic pathways to block tumorigenesis and progression. The combination of endocrine-, immune-, and chemotherapy might exert a highly synergistic effect against certain tumors. Herein, a series of smart Pt(IV) prodrugs 3-6, named Melatplatin, were rationally designed not only to multitarget DNA, MT1, and estrogen receptor (ER) but also to activate immune response. Melatplatin, conjugating first-line chemotherapeutic Pt drugs with human endogenous melatonin (MT), significantly enhanced drug efficacy especially in ER high-expression (ER+) cells, among which 3 presented the most potent cytotoxicity toward ER+ MCF-7 with nanomolar IC50 values 100-fold lower than cisplatin. Melatplatin could bind well to melatonin receptor (MT1) according to molecular docking. Besides, 3 evidently increased intracellular accumulation and DNA damage, upregulated γH2AX and P53, and silenced NF-κB to induce massive apoptosis. Most strikingly, 3 effectively inhibited tumor growth and attenuated systemic toxicity compared to cisplatin in vivo, promoting lymphocyte proliferation in spleen to achieve immune modulation.
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Antineoplásicos/química , Platino (Metal)/química , Profármacos/química , Receptor de Melatonina MT1/metabolismo , Receptores de Estrógenos/metabolismo , Animales , Antineoplásicos/farmacología , Antineoplásicos/uso terapéutico , Apoptosis/efectos de los fármacos , Sitios de Unión , Puntos de Control del Ciclo Celular/efectos de los fármacos , Línea Celular Tumoral , Proliferación Celular/efectos de los fármacos , Daño del ADN/efectos de los fármacos , Humanos , Sistema Inmunológico/efectos de los fármacos , Sistema Inmunológico/metabolismo , Ratones , Ratones Desnudos , Simulación del Acoplamiento Molecular , FN-kappa B/antagonistas & inhibidores , FN-kappa B/genética , FN-kappa B/metabolismo , Neoplasias/tratamiento farmacológico , Neoplasias/patología , Profármacos/farmacología , Profármacos/uso terapéutico , Estructura Terciaria de Proteína , Receptor de Melatonina MT1/química , Receptores de Estrógenos/químicaRESUMEN
Depression is a highly prevalent risk factor for both the onset of cardiovascular disease (CVD) and the mortality of CVD patients, and people suffering from CVD are more likely to develop depression than healthy individuals. The aim of this review is to summarize recent findings regarding the underlying relationship between CVD and depression. Literature search and review were conducted using PubMed, Google Scholar, Wanfang Med Online, and Baidu Scholar databases. CVD and depression are intimately related and researchers from around the world have proposed and validated various mechanisms that may potentially explain the comorbidity of CVD and depression. Recent studies have suggested that depression and CVD may manifest as two distinct clinical conditions in two different organs, the brain and the heart, respectively, but may also be linked by shared mechanisms. Of these, inflammation involving the immune system is thought to be a common mechanism of depression and heart disease, with specific inflammatory cytokines or pathways being potential targets for the prevention and treatment of the concurrent diseases. Therefore, inflammation may play an important role in bridging the link between depression and CVD, a finding that can have important clinical implications for the prevention and early intervention of these conditions.
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A new 1,4,7-triazacyclononane derivative, 4-benzyloxy-benzyl-1,4,7-triazacyclononane (btacn), and three associated cyclen complexes, Cu(btacn)Cl2, Zn(btacn)Cl2 and [Cu(btacn)2]·(ClO4)2, were prepared to serve as DNA synthesis interferents. The compounds were characterized using IR, 1H and 13C NMR, ESI-MS, elemental analysis and X-ray single crystal diffraction methods, and their DNA damage mechanisms and cytotoxicities towards cancer and normal cells were studied. Among them, Cu(btacn)Cl2 and [Cu(btacn)2]·(ClO4)2 exhibit potent anti-proliferation activity in HepG-2 and HeLa cells, but low cytotoxicity in the normal cell models LO2 and HUVEC, giving SI values (IC50 ratios) ranging from 2.45 to 7.09-times higher than that of cisplatin. DNA binding and cleavage studies suggested that [Cu(btacn)2]·(ClO4)2 can more easily intercalate into CT-DNA than Cu(btacn)Cl2, which is consistent with the results of G2/S phase arrest and apoptosis in HepG-2 cells involving the complexes. In contrast, Zn(btacn)Cl2 demonstrated weak DNA binding and no obvious cytotoxicity. The results suggest that Cu(btacn)Cl2 and [Cu(btacn)2]·(ClO4)2 mainly undergo redox processes to produce reactive oxygen species (ROS) that induce DNA degradation and mitochondrial damage.
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Antineoplásicos/farmacología , Apoptosis/efectos de los fármacos , Complejos de Coordinación/química , Cobre/química , Daño del ADN/efectos de los fármacos , Especies Reactivas de Oxígeno/metabolismo , Antineoplásicos/química , Puntos de Control del Ciclo Celular/efectos de los fármacos , Línea Celular , Complejos de Coordinación/farmacología , Cristalografía por Rayos X , División del ADN/efectos de los fármacos , Células Hep G2 , Compuestos Heterocíclicos/química , Humanos , Mitocondrias/metabolismo , Conformación MolecularRESUMEN
Three dinuclear lanthanide complexes, [Ln2(L)2(µ3-OAc)4(H2O)2]â 2H2O (Ln = La (1), Eu (2) and Dy (3), HL = N'-(2-hydroxybenzylidene) nicotinohydrazide), have been synthesized and characterized by IR, elemental analysis and X-ray single-crystal diffraction. Crystallographic study revealed that the representative complex 1 displays a discrete dinuclear structure with a distorted tricapped trigonal prismatic geometry around La(III) ion. The interaction of complexes 1-3 with CT-DNA was investigated by absorption spectra, fluorescence quenching and viscosity, which reveals that the complexes bind to CT-DNA with a moderate intercalative mode. The complexes exhibited obvious DNA cleavage activities in the presence of H2O2. All complexes could bind to human serum albumin (HSA) with medium affinity through static mode; thus, HSA could effectively transport complexes. Furthermore, three complexes exhibited specific cytotoxicity to A549 cancer cells in micromole magnitude than other cancer cells tested and less toxicity than cisplatin for normal human cells HUVEC, in which massive cell apoptosis was induced by complexes through producing DNA damage and suppressing DNA synthesis.Communicated by Ramaswamy H. Sarma.
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Antineoplásicos/síntesis química , Antineoplásicos/farmacología , ADN/metabolismo , Hidrazinas/farmacología , Elementos de la Serie de los Lantanoides/síntesis química , Elementos de la Serie de los Lantanoides/farmacología , Bases de Schiff/farmacología , Albúmina Sérica Humana/metabolismo , Animales , Antineoplásicos/química , Apoptosis/efectos de los fármacos , Bovinos , Ciclo Celular/efectos de los fármacos , Línea Celular Tumoral , Cristalografía por Rayos X , División del ADN , Humanos , Hidrazinas/síntesis química , Hidrazinas/química , Concentración 50 Inhibidora , Cinética , Elementos de la Serie de los Lantanoides/química , Conformación Molecular , Unión Proteica , Bases de Schiff/síntesis química , Bases de Schiff/química , Análisis Espectral , Termodinámica , ViscosidadRESUMEN
Haploinsufficiency of the protein kinase Tbk1 has shown to cause both amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD); however, the pathogenic mechanisms are unclear. Here we show that conditional neuronal deletion of Tbk1 in leads to cognitive and locomotor deficits in mice. Tbk1-NKO mice exhibited numerous neuropathological changes, including neurofibrillary tangles, abnormal dendrites, reduced dendritic spine density, and cortical synapse loss. The Purkinje cell layer of the cerebellum presented dendritic swelling, abnormally shaped astrocytes, and p62- and ubiquitin-positive aggregates, suggesting impaired autophagy. Inhibition of autophagic flux with bafilomycin A increased total Tkb1 levels in motor neuron-like cells in vitro, suggesting autophagy-dependent degradation of Tbk1. Although Tbk1 over-expression did not affect mutant SOD1 levels in SOD1G93A-transfected cells, it increased the soluble/insoluble ratio and reduced the number and size of SOD1G93A aggregates. Finally, in vivo experiments showed that Tkb1 expression was reduced in SOD1G93A ALS transgenic mice, which showed decreased p62 protein aggregation and extended survival after ICV injection of adeno-associated viral vectors encoding Tbk1. These data shed light on the neuropathological changes that result from Tbk1 deficiency and hint at impaired autophagy as a contributing factor to the cognitive and locomotor deficits that characterize FTD-ALS in patients with Tkb1 haploinsufficiency.
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Esclerosis Amiotrófica Lateral/genética , Autofagia/genética , Demencia Frontotemporal/genética , Actividad Motora/genética , Proteínas Serina-Treonina Quinasas/genética , Esclerosis Amiotrófica Lateral/metabolismo , Esclerosis Amiotrófica Lateral/patología , Animales , Conducta Animal/fisiología , Cerebelo/metabolismo , Cerebelo/patología , Modelos Animales de Enfermedad , Demencia Frontotemporal/metabolismo , Demencia Frontotemporal/patología , Ratones , Ratones Noqueados , Neuronas Motoras/metabolismo , Neuronas Motoras/patología , Fosforilación , Proteínas Serina-Treonina Quinasas/metabolismoRESUMEN
A new dual functional turn-on chemosensor, 2,6-diformyl-4-methylphenol-di(isoquinolinyl-1-hydrazone) (HL), has been developed, which could highly selectively discriminate Mg2+ and Zn2+ in different solvent systems. The chemosensor HL exhibits rapid visual turn-on fluorescence enhancing recognition toward Mg2+/Zn2+, which is not interfered by other cations, especially for respective congeners Ca2+/Cd2+. The remarkable fluorescence enhancement (71-fold or 11-fold) was observed after adding Mg2+ in acetonitrile or Zn2+ in DMF-H2O solvent systems. Additionally such a solvent medium-controlled platform could achieve the quantitative determination of Mg2+ and Zn2+ quantitation with low detection limits of 2.97 × 10-8 M and 3.07 × 10-7 M, respectively. Furthermore, the turn-on fluorescence sensing mechanism is also investigated by 1H NMR, FT-IR and ESI-MS spectroscopy. Density functional theory (DFT) calculations derive optimized geometries of HL and its complexes. Notably, non-toxic HL also can be successfully applied as a visual probe for the practical determination of Mg2+/Zn2+ in MCF-7 cells, Zebrafish larvae, syrup and water samples, which might provide extensive application in biology and medicine fields.
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Colorantes Fluorescentes/química , Hidrazonas/química , Isoquinolinas/química , Magnesio/análisis , Zinc/análisis , Animales , Teoría Funcional de la Densidad , Agua Potable/análisis , Fluorescencia , Colorantes Fluorescentes/síntesis química , Colorantes Fluorescentes/toxicidad , Humanos , Hidrazonas/síntesis química , Hidrazonas/toxicidad , Isoquinolinas/síntesis química , Isoquinolinas/toxicidad , Lagos/análisis , Límite de Detección , Células MCF-7 , Modelos Químicos , Solventes/química , Espectrometría de Fluorescencia/métodos , Pez CebraRESUMEN
As FDA-approved chemotherapeutic agents, cisplatin, oxaliplatin, and 5-fluorouracil are widely used in clinic but limited by severe side-effects. To ameliorate their respective defects, a series of "dual-prodrug" by linking oxoplatin and 5-FU were designed and synthesized. The assembled compounds 10-17, named Fuplatin, exhibited much higher cytotoxicity against the tested cancer cells while lower cytotoxicity toward the human normal lung cells than free drugs or their combinations. Among them, 14 enhanced cellular accumulation with 62- and 825-fold amount of oxaliplatin and 8 at 9 h, respectively, significantly induced DNA damage and cell apoptosis, and inhibited migration and invasion in HCT-116 cells. Compound 14 arrested the cell cycle at S and G2 phases and up-regulated thymidylate synthase and p53, consistent with the results of the combination, suggesting 14 adopted a collaborative mode of 5-FU and oxaliplatin to kill cancer cells. In vivo, compound 14 showed high antitumor effect and no observable toxicity in NOD/SCID mice bearing HCT-116 tumors.