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1.
Clin Cosmet Investig Dermatol ; 17: 2009-2019, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39253065

RESUMEN

Purpose: Superficial Infantile hemangioma (SIH) is the most common type of IH. Some studies have shown the efficacy of 755-nm long pulse alexandrite laser (LPAL) and topical 2% carteolol hydrochloride (C-HCL) eye drops for the treatment of SIH. This article retrospectively analyzes the safety and efficacy of 755-nm LPAL combined with 2% C-HCL eye drops for treating thicker SIH, and explores the optimal treatment time for SIH. Materials and Methods: This study included 2-5 mm thick SIH patients who received co-treatment of 755-nm LPAL and 2% C-HCL eye drops. The SIH patients were divided into 3 groups based on their age and IH growth curve: ≤ 1 month (≤ 1M), 1-3 months (excluding 1 month; 1-3M), and 3-12 months (excluding 3 months; 3-12M). Results: There was no difference in efficacy between the ≤ 1M and the 1-3M group, and were both better than the 3-12M group. Furthermore, there was no difference in the average number of treatments between the ≤ 1M and 1-3M groups and were both less than the 3-12M group. There was no significant difference in the incidence of adverse reactions between the groups. Compared with the ≤ 1M and 1-3M groups, the 3-12M group indicated more permanent skin lesions after the treatment. Conclusion: It was revealed that co-treatment with 755-nm LPAL and 2% C-HCL eye drops is safe and effective against thicker SIH. Compared with the 3-12M group, ≤ 3 months can achieve better efficacy, requires a shorter treatment time, less likely to leave permanent skin lesions such as scars. Moreover, patients with no proliferation can be observed to 1 month.

2.
Clin Cosmet Investig Dermatol ; 17: 2071-2075, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39296327

RESUMEN

Condyloma acuminatum (CA), commonly known as anogenital warts, is a prevalent sexually transmitted disease primarily caused by low risk human papillomavirus (HPV) types 6 and 11. This case report outlines the successful use of photodynamic therapy (PDT) to treat extensive condyloma acuminatum in a young female patient with systemic lupus erythematosus (SLE) undergoing immunosuppressive treatment. The patient also had cervical intraepithelial neoplasia grade I. Carbon dioxide laser treatment were initially used to remove some surface warts, followed by PDT, resulting in satisfactory outcomes. After seven sessions, the warty growths were successfully removed. Interdisciplinary collaboration, involving rheumatology, gynecology, and dermatology, facilitated comprehensive management. This case highlights the efficacy and safety of PDT in treating condyloma acuminatum and suggests its potential as an alternative treatment for young SLE patients with similar conditions.

4.
bioRxiv ; 2024 Sep 13.
Artículo en Inglés | MEDLINE | ID: mdl-38405744

RESUMEN

In recent years, the field of neuroscience has increasingly recognized the importance of studying animal behaviors in naturalistic environments to gain deeper insights into ethologically relevant behavioral processes and neural mechanisms. The common marmoset (Callithrix jacchus), due to its small size, prosocial nature, and genetic proximity to humans, has emerged as a pivotal model toward this effort. However, traditional research methodologies often fail to fully capture the nuances of marmoset social interactions and cooperative behaviors. To address this critical gap, we developed the Marmoset Apparatus for Automated Pulling (MarmoAAP), a novel behavioral apparatus designed for studying cooperative behaviors in common marmosets. MarmoAAP addresses the limitations of traditional behavioral research methods by enabling high-throughput, detailed behavior outputs that can be integrated with video and audio recordings, allowing for more nuanced and comprehensive analyses even in a naturalistic setting. We also highlight the flexibility of MarmoAAP in task parameter manipulation which accommodates a wide range of behaviors and individual animal capabilities. Furthermore, MarmoAAP provides a platform to perform investigations of neural activity underlying naturalistic social behaviors. MarmoAAP is a versatile and robust tool for advancing our understanding of primate behavior and related cognitive processes. This new apparatus bridges the gap between ethologically relevant animal behavior studies and neural investigations, paving the way for future research in cognitive and social neuroscience using marmosets as a model organism.

5.
Neurobiol Learn Mem ; 203: 107793, 2023 09.
Artículo en Inglés | MEDLINE | ID: mdl-37353191

RESUMEN

The orbitofrontal cortex (OFC) is regarded as one of the core brain areas in a variety of value-based behaviors. Over the past two decades, tremendous knowledge about the OFC function was gained from studying the behaviors of single subjects. As a result, our previous understanding of the OFC's function of encoding decision variables, such as the value and identity of choices, has evolved to the idea that the OFC encodes a more complex representation of the task space as a cognitive map. Accumulating evidence also indicates that the OFC importantly contributes to behaviors in social contexts, especially those involved in cooperative interactions. However, it remains elusive how exactly OFC neurons contribute to social functions and how non-social and social behaviors are related to one another in the computations performed by OFC neurons. In this review, we aim to provide an integrated view of the OFC function across both social and non-social behavioral contexts. We propose that seemingly complex functions of the OFC may be explained by its role in providing a goal-directed cognitive map to guide a wide array of adaptive reward-based behaviors in both social and non-social domains.


Asunto(s)
Objetivos , Corteza Prefrontal , Humanos , Corteza Prefrontal/fisiología , Motivación , Encéfalo , Cognición , Recompensa
6.
Clin Cosmet Investig Dermatol ; 16: 717-720, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-36987401

RESUMEN

Eosinophilic pustular folliculitis (EPF) is a rare, chronic, itchy, aseptic disease. Although most cases of infantile EPF (I-EPF) are detected in infants, we found that a 7-year-old child with I-EPF, who received treatment with oral azithromycin in combination with topical narrow bound Ultra Violet B light (NB-UVB) irradiation, with no recurrence at follow-up. Our experience with the successful treatment of this patient can provide a reference for more pediatric patients.

7.
Nat Commun ; 13(1): 4405, 2022 07 29.
Artículo en Inglés | MEDLINE | ID: mdl-35906242

RESUMEN

Economic choices between goods entail the computation and comparison of subjective values. Previous studies examined neuronal activity in the orbitofrontal cortex (OFC) of monkeys choosing between different types of juices. Three groups of neurons were identified: offer value cells encoding the value of individual offers, chosen juice cells encoding the identity of the chosen juice, and chosen value cells encoding the value of the chosen offer. The encoded variables capture both the input (offer value) and the output (chosen juice, chosen value) of the decision process, suggesting that values are compared within OFC. Recent work demonstrates that choices are causally linked to the activity of offer value cells. Conversely, the hypothesis that OFC contributes to value comparison has not been confirmed. Here we show that weak electrical stimulation of OFC specifically disrupts value comparison without altering offer values. This result implies that neuronal populations in OFC participate in value comparison.


Asunto(s)
Conducta de Elección , Corteza Prefrontal , Animales , Conducta de Elección/fisiología , Macaca mulatta , Neuronas/fisiología , Corteza Prefrontal/fisiología , Recompensa
8.
Elife ; 112022 04 13.
Artículo en Inglés | MEDLINE | ID: mdl-35416775

RESUMEN

Economic choices are characterized by a variety of biases. Understanding their origins is a long-term goal for neuroeconomics, but progress on this front has been limited. Here, we examined choice biases observed when two goods are offered sequentially. In the experiments, rhesus monkeys chose between different juices offered simultaneously or in sequence. Choices under sequential offers were less accurate (higher variability). They were also biased in favor of the second offer (order bias) and in favor of the preferred juice (preference bias). Analysis of neuronal activity recorded in the orbitofrontal cortex revealed that these phenomena emerged at different computational stages. Lower choice accuracy reflected weaker offer value signals (valuation stage), the order bias emerged during value comparison (decision stage), and the preference bias emerged late in the trial (post-comparison). By neuronal measures, each phenomenon reduced the value obtained on average in each trial and was thus costly to the monkey.


Asunto(s)
Conducta de Elección , Neuronas , Animales , Sesgo , Conducta de Elección/fisiología , Toma de Decisiones/fisiología , Macaca mulatta , Neuronas/fisiología , Corteza Prefrontal/fisiología
9.
Dermatol Ther ; 35(5): e15406, 2022 05.
Artículo en Inglés | MEDLINE | ID: mdl-35199898

RESUMEN

Infantile hemangioma (IH) is the most common benign vascular tumor that occurs in infants and young children. Studies have shown laser therapy to reduce the proliferation of superficial IH and promote its regression, but the optimal timing for treatment has not been determined. Our study explores the timing and safety of 595-nm pulsed dye laser (PDL) treatment for early superficial IH. We retrospectively analyzed 180 cases of superficial IH treated with 595-nm PDL. Data was organized according to patient age at the first visit. Six months after the initial treatment, patients were evaluated using a grade IV classification method, and the clinical curative effect of each group was calculated. The number of laser treatments and the occurrence of adverse reactions were recorded simultaneously. The overall effective and cure rates were 98.3% and 84.4%, respectively, with no significant difference in rates between groups (p > 0.05). There was a statistically significant difference in the number of laser treatments among the age groups (p < 0.05). The average laser frequency: "0-2 months group" < "2-4 months group" < "4-6 months group." The overall incidence of adverse reactions was 11.1%, and 12 (6.7%) cases had short-term adverse reactions, with no statistically significant differences between groups (p > 0.05). Eight cases had long-term adverse reactions. This difference between groups was statistically significant (p < 0.05). Younger children (≤2 months of age) receiving 595-nm PDL treatment for IH require relatively fewer treatment times than other children (>2 months of age), have a shorter course of disease, experience better curative effect, and have fewer sequelae reactions.


Asunto(s)
Hemangioma , Terapia por Láser , Láseres de Colorantes , Terapia por Luz de Baja Intensidad , Niño , Preescolar , Hemangioma/tratamiento farmacológico , Humanos , Lactante , Láseres de Colorantes/efectos adversos , Terapia por Luz de Baja Intensidad/efectos adversos , Terapia por Luz de Baja Intensidad/métodos , Estudios Retrospectivos , Resultado del Tratamiento
10.
J Neurosci ; 42(1): 33-43, 2022 01 05.
Artículo en Inglés | MEDLINE | ID: mdl-34764156

RESUMEN

A series of studies in which monkeys chose between two juices offered in variable amounts identified in the orbitofrontal cortex (OFC) different groups of neurons encoding the value of individual options (offer value), the binary choice outcome (chosen juice), and the chosen value. These variables capture both the input and the output of the choice process, suggesting that the cell groups identified in OFC constitute the building blocks of a decision circuit. Several lines of evidence support this hypothesis. However, in previous experiments offers were presented simultaneously, raising the question of whether current notions generalize to when goods are presented or are examined in sequence. Recently, Ballesta and Padoa-Schioppa (2019) examined OFC activity under sequential offers. An analysis of neuronal responses across time windows revealed that a small number of cell groups encoded specific sequences of variables. These sequences appeared analogous to the variables identified under simultaneous offers, but the correspondence remained tentative. Thus, in the present study, we examined the relation between cell groups found under sequential versus simultaneous offers. We recorded from the OFC while monkeys chose between different juices. Trials with simultaneous and sequential offers were randomly interleaved in each session. We classified cells in each choice modality, and we examined the relation between the two classifications. We found a strong correspondence; in other words, the cell groups measured under simultaneous offers and under sequential offers were one and the same. This result indicates that economic choices under simultaneous or sequential offers rely on the same neural circuit.SIGNIFICANCE STATEMENT Research in the past 20 years has shed light on the neuronal underpinnings of economic choices. A large number of results indicates that decisions between goods are formed in a neural circuit within the orbitofrontal cortex. In most previous studies, subjects chose between two goods offered simultaneously. Yet, in daily situations, goods available for choice are often presented or examined in sequence. Here we recorded neuronal activity in the primate orbitofrontal cortex alternating trials under simultaneous and under sequential offers. Our analyses demonstrate that the same neural circuit supports choices in the two modalities. Hence, current notions on the neuronal mechanisms underlying economic decisions generalize to choices under sequential offers.


Asunto(s)
Conducta de Elección/fisiología , Vías Nerviosas/fisiología , Neuronas/fisiología , Corteza Prefrontal/fisiología , Animales , Macaca mulatta , Masculino
11.
Clin Cosmet Investig Dermatol ; 14: 1593-1599, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34754209

RESUMEN

PURPOSE: Infantile hemangioma (IH) is the most common benign tumor in infancy, and superficial IH is the most common type. IH can reportedly resolve spontaneously, but this is associated with complications, such as scars, atrophy, hypopigmentation, telangiectasia, and skin sagging, in 70% of cases. This study explores the safety and feasibility of therapeutic intervention with the 595-nm pulsed-dye laser (PDL) combined with 0.5% timolol maleate solution in superficial IH and compares the difference in efficacy between the early group and the late group. PATIENTS AND METHODS: This retrospective study examined 167 patients with superficial IH who underwent combination therapy at the Dermatology Clinic of the Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University between July 2019 and July 2020. The early and late groups were composed of children aged ≤2 and >2 months, respectively. Treatment was administered for 6 months, and patients were followed up for another 6 months. Two independent, double-blinded physicians reviewed photographs of the skin lesions before and after treatment to evaluate efficacy. RESULTS: The early group demonstrated higher treatment efficacy than the late group. The early (n = 45) and late (n = 122) groups had treatment efficacy rates of 95.5% and 86.1%, respectively; the difference was statistically significant (P< 0.05). The early and late groups underwent 3.51 ± 0.50 and 4.73 ± 0.68 months of treatment, respectively; the difference was statistically significant (P< 0.05). Seventeen (44.4%) patients in the early group had immediate adverse reactions but no permanent sequelae, whereas 25 (20.49%) and 13 (10.7%) patients in the late group had immediate and permanent sequelae, respectively. The difference was statistically significant (P<0.05). CONCLUSION: This retrospective study demonstrated that 595-nm PDL combined with 0.5% timolol maleate solution was a safe and effective local treatment for superficial IH. Early treatment required fewer treatments, had better curative effects, and a lower probability of permanent sequelae.

12.
Nature ; 588(7838): 450-453, 2020 12.
Artículo en Inglés | MEDLINE | ID: mdl-33139951

RESUMEN

In the eighteenth century, Daniel Bernoulli, Adam Smith and Jeremy Bentham proposed that economic choices rely on the computation and comparison of subjective values1. This hypothesis continues to inform modern economic theory2 and research in behavioural economics3, but behavioural measures are ultimately not sufficient to verify the proposal4. Consistent with the hypothesis, when agents make choices, neurons in the orbitofrontal cortex (OFC) encode the subjective value of offered and chosen goods5. Value-encoding cells integrate multiple dimensions6-9, variability in the activity of each cell group correlates with variability in choices10,11 and the population dynamics suggests the formation of a decision12. However, it is unclear whether these neural processes are causally related to choices. More generally, the evidence linking economic choices to value signals in the brain13-15 remains correlational16. Here we show that neuronal activity in the OFC is causal to economic choices. We conducted two experiments using electrical stimulation in rhesus monkeys (Macaca mulatta). Low-current stimulation increased the subjective value of individual offers and thus predictably biased choices. Conversely, high-current stimulation disrupted both the computation and the comparison of subjective values, and thus increased choice variability. These results demonstrate a causal chain linking subjective values encoded in OFC to valuation and choice.


Asunto(s)
Ciencias Bioconductuales , Toma de Decisiones/fisiología , Economía , Modelos Neurológicos , Corteza Prefrontal/citología , Corteza Prefrontal/fisiología , Animales , Conductividad Eléctrica , Estimulación Eléctrica , Electrodos , Macaca mulatta/fisiología , Masculino , Neuronas/fisiología
13.
Eur J Med Chem ; 156: 126-136, 2018 Aug 05.
Artículo en Inglés | MEDLINE | ID: mdl-30006158

RESUMEN

A novel series of aniline-containing hydroxamic acids were designed, synthesized and evaluated as anti-virulence agents for the treatment of gastritis and gastric ulcer caused by Helicobacter pylori. In vitro enzyme-based screen together with in vivo assays and structure-activity relationship (SAR) studies led to the discovery of three potent urease inhibitors 3-(3,5-dichlorophenylamino)N-hydroxypropanamide (3a), 3-(2-chlorophenylamino)N-hydroxypropanamide (3d) and 3-(2,4-dichlorophenylamino)N-hydroxypropanamide (3n). Compounds 3a, 3d and 3n showed excellent urease inhibition with IC50 values 0.043 ±â€¯0.005, 0.055 ±â€¯0.008 and 0.018 ±â€¯0.002 µM, and significantly depressed gastritis developing at the dose of 32 mg/kg b. i.d with eradication rates of H. pylori reaching 92.3, 84.6 and 100%, respectively. Preliminary safety studies (acute toxicity in mice) disclosed that 3a, 3d and 3n was well-tolerated in KM mice with LD50s of 2982.8, 3349.4 and 3126.9 mg/kg, respectively. Collectively, the data obtained in this study indicate that 3a, 3d and 3n, in particular 3n, could considered as promising candidates for the potential treatment of H. pylori caused gastritis and gastric ulcer, and hence merit further studies.


Asunto(s)
Antibacterianos/química , Antibacterianos/uso terapéutico , Infecciones por Helicobacter/tratamiento farmacológico , Helicobacter pylori/efectos de los fármacos , Helicobacter pylori/enzimología , Ácidos Hidroxámicos/química , Ácidos Hidroxámicos/uso terapéutico , Ureasa/antagonistas & inhibidores , Aminación , Animales , Antibacterianos/farmacología , Femenino , Gastritis/tratamiento farmacológico , Gastritis/etiología , Gastritis/microbiología , Infecciones por Helicobacter/complicaciones , Infecciones por Helicobacter/microbiología , Humanos , Ácidos Hidroxámicos/farmacología , Masculino , Ratones , Simulación del Acoplamiento Molecular , Úlcera Gástrica/tratamiento farmacológico , Úlcera Gástrica/etiología , Úlcera Gástrica/microbiología , Relación Estructura-Actividad , Ureasa/metabolismo
14.
Eur J Med Chem ; 133: 62-68, 2017 Jun 16.
Artículo en Inglés | MEDLINE | ID: mdl-28380394

RESUMEN

Tyrosyl-tRNA synthetase (TyrRS) is an aminoacyl-tRNA synthetase family protein that possesses an essential role in bacterial protein synthesis. The synthesis, structure-activity relationship, and evolution of a novel series of adenosine-containing 3-arylfuran-2(5H)-ones as TyrRS inhibitors are described. Advanced compound d3 from this series exhibited excellent affinity for TyrRS with IC50 of 0.61 ± 0.04 µM. Bacterial growth inhibition assays demonstrated that d3 showed submicromolar antibacterial potency against Escherichia coli and Pseudomonas aeruginosa, and compared to the marketed antibiotics ciprofloxacin.


Asunto(s)
Adenosina/análogos & derivados , Adenosina/farmacología , Antibacterianos/química , Antibacterianos/farmacología , Escherichia coli/enzimología , Pseudomonas aeruginosa/enzimología , Tirosina-ARNt Ligasa/antagonistas & inhibidores , Adenosina/síntesis química , Antibacterianos/síntesis química , Inhibidores Enzimáticos/síntesis química , Inhibidores Enzimáticos/química , Inhibidores Enzimáticos/farmacología , Escherichia coli/efectos de los fármacos , Infecciones por Escherichia coli/tratamiento farmacológico , Células HeLa , Humanos , Simulación del Acoplamiento Molecular , Infecciones por Pseudomonas/tratamiento farmacológico , Pseudomonas aeruginosa/efectos de los fármacos , Relación Estructura-Actividad , Tirosina-ARNt Ligasa/metabolismo
15.
Bioorg Med Chem ; 24(19): 4519-4527, 2016 10 01.
Artículo en Inglés | MEDLINE | ID: mdl-27492194

RESUMEN

Helicobacter pylori urease is involved in several physiologic responses such as stomach and duodenal ulcers, adenocarcinomas and stomach lymphomas. Thus, inhibition of urease is taken for a good chance to treat H. pylori-caused infections, we have therefore focused our efforts on seeking novel urease inhibitors. Here, a series of arylpropionylhydroxamic acids were synthesized and evaluated for urease inhibition. Out of these compounds, 3-(2-benzyloxy-5-chlorophenyl)-3-hydroxypropionylhydroxamic acid (d24) was the most active inhibitor with IC50 of 0.15±0.05µM, showing a mixed inhibition with both competitive and uncompetitive aspects. Non-linear fitting of kinetic data gives kinetics parameters of 0.13 and 0.12µg·mL(-1) for Ki and Ki', respectively. The plasma protein binding assays suggested that d24 exhibited moderate binding to human and rabbit plasma proteins.


Asunto(s)
Antibacterianos/química , Antibacterianos/farmacología , Helicobacter pylori/efectos de los fármacos , Helicobacter pylori/enzimología , Ácidos Hidroxámicos/química , Ácidos Hidroxámicos/farmacología , Ureasa/antagonistas & inhibidores , Animales , Antibacterianos/metabolismo , Proteínas Sanguíneas/metabolismo , Infecciones por Helicobacter/tratamiento farmacológico , Infecciones por Helicobacter/microbiología , Humanos , Ácidos Hidroxámicos/metabolismo , Cinética , Simulación del Acoplamiento Molecular , Conejos , Relación Estructura-Actividad , Ureasa/metabolismo
16.
Bioorg Med Chem ; 23(20): 6602-11, 2015 Oct 15.
Artículo en Inglés | MEDLINE | ID: mdl-26404408

RESUMEN

Herein we describe the synthesis and evaluation of a series of adenosine analogs for in vitro antibacterial activity against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. Out of these compounds, compound c6 has much stronger antibacterial potency against Pseudomonas aeruginosa than ciprofloxacin, and was determined to target tyrosyl-tRNA synthetase with IC50 of 0.8±0.07 µM. Structure-activity relationship analysis suggested that introduction of a fluorine atom at the 3'-position of benzene ring of the phenylacetyl moiety significantly increased affinities to the enzyme. In comparison with isopropylidene analogs, 2',3'-deprotected compounds displayed higher inhibitory activity. Molecular dockings provided an explanation for observations in biological assays.


Asunto(s)
Adenosina/análogos & derivados , Adenosina/farmacología , Antibacterianos/farmacología , Diseño de Fármacos , Inhibidores Enzimáticos/farmacología , Tirosina-ARNt Ligasa/antagonistas & inhibidores , Adenosina/química , Antibacterianos/síntesis química , Antibacterianos/química , Relación Dosis-Respuesta a Droga , Inhibidores Enzimáticos/síntesis química , Inhibidores Enzimáticos/química , Escherichia coli/efectos de los fármacos , Pruebas de Sensibilidad Microbiana , Simulación de Dinámica Molecular , Estructura Molecular , Pseudomonas aeruginosa/efectos de los fármacos , Staphylococcus aureus/efectos de los fármacos , Staphylococcus aureus/enzimología , Relación Estructura-Actividad , Tirosina-ARNt Ligasa/metabolismo
17.
Eur J Med Chem ; 102: 631-8, 2015 Sep 18.
Artículo en Inglés | MEDLINE | ID: mdl-26318069

RESUMEN

Tyrosyl-tRNA synthetase (TyrRS), an essential enzyme in bacterial protein biosynthesis, is an attractive therapeutic target for finding novel antibacterial agents, and a series of N2-(arylacetyl)glycinanilides has been herein synthesized and identified as TyrRS inhibitors. These efforts yielded several compounds, with IC50 in the low micromolar range against TyrRS from Staphylococcus aureus. Out of the obtained compounds, 3ap is the most active and exhibits excellent activity against both Gram-positive (S. aureus) and Gram-negative (Escherichia coli and Pseudomonas aeruginosa) bacterial strains. In comparison with the parent scaffold 3-arylfuran-2(5H)-one, N2-(arylacetyl)glycinanilide significantly improved the potency against Gram-negative bacterial strains, indicating that this scaffold offers a significant potential for developing new antibacterial drugs.


Asunto(s)
Acetanilidas/farmacología , Antibacterianos/síntesis química , Antibacterianos/farmacología , Bencenoacetamidas/farmacología , Inhibidores Enzimáticos/farmacología , Bacterias Gramnegativas/efectos de los fármacos , Bacterias Grampositivas/efectos de los fármacos , Tirosina-ARNt Ligasa/antagonistas & inhibidores , Acetanilidas/síntesis química , Acetanilidas/química , Antibacterianos/química , Bencenoacetamidas/síntesis química , Bencenoacetamidas/química , Relación Dosis-Respuesta a Droga , Inhibidores Enzimáticos/síntesis química , Inhibidores Enzimáticos/química , Bacterias Grampositivas/enzimología , Humanos , Pruebas de Sensibilidad Microbiana , Estructura Molecular , Relación Estructura-Actividad , Tirosina-ARNt Ligasa/metabolismo
18.
Bioorg Med Chem ; 23(15): 4508-4513, 2015 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-26113187

RESUMEN

Therapies based on urease inhibition are now seriously considered as the first line of treatment for infections caused by Helicobacter pylori. However, the present inhibitors are ineffective or unstable in highly acidic gastric juice. Here, we report a series of benzylanilines as effective inhibitors of H. pylori urease. Out of the obtained twenty-one compounds, N-(3,4-dihydroxybenzyl)-4-nitroaniline (4) was evaluated in detail and shows promising features for development as anti-H. pylori agent. Excellent potency against urease in both cell-free extract and intact cell was observed at low concentrations of 4 (IC50=0.62 ± 0.04 and 1.92 ± 0.09 µM), which showed over 29- and 54-fold increase in potency with respect to the positive control AHA. The SAR analysis revealed that protection of 3,4-dihydroxy group of 4 as methoxy or changes of 4-NO2 will result in a moderate to dramatic decrease in potency.


Asunto(s)
Inhibidores Enzimáticos/síntesis química , Inhibidores Enzimáticos/farmacología , Etano/análogos & derivados , Helicobacter pylori/enzimología , Ureasa/antagonistas & inhibidores , Etano/síntesis química , Etano/farmacología , Simulación del Acoplamiento Molecular , Relación Estructura-Actividad
19.
Bioorg Med Chem ; 23(15): 4860-4865, 2015 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-26048027

RESUMEN

3-Arylfuran-2(5H)-one derivatives show good antibacterial activity and were determined as tyrosyl-tRNA synthetase (TyrRS) inhibitors. In a systematic medicinal chemistry exploration, we demonstrated chemical opportunities to treat infections caused by Helicobacter pylori. Twenty 3-arylfuran-2(5H)-ones were synthesized and evaluated for anti-H. pylori, antioxidant and anti-urease activities which are closely interconnected with H. pylori infection. The results displayed that some of the compounds show excellent antioxidant activity, and good anti-H. pylori and urease inhibitory activities. Out of these compounds, 3-(3-methylphenyl)furan-2(5H)-one (b9) showed the most potent antioxidant activity (IC50=8.2 µM) and good anti-H. pylori activity (MIC50=2.6 µg/mL), and it can be used as a good candidate for discovering novel anti-gastric ulcer agent.


Asunto(s)
Antibacterianos/síntesis química , Antiulcerosos/síntesis química , Furanos/química , Antibacterianos/metabolismo , Antibacterianos/farmacología , Antiulcerosos/farmacología , Antiulcerosos/uso terapéutico , Antioxidantes/química , Sitios de Unión , Evaluación Preclínica de Medicamentos , Furanos/farmacología , Furanos/uso terapéutico , Helicobacter pylori/efectos de los fármacos , Helicobacter pylori/enzimología , Humanos , Simulación del Acoplamiento Molecular , Estructura Terciaria de Proteína , Úlcera Gástrica/tratamiento farmacológico , Tirosina-ARNt Ligasa/antagonistas & inhibidores , Tirosina-ARNt Ligasa/metabolismo , Ureasa/antagonistas & inhibidores , Ureasa/metabolismo
20.
FEBS Lett ; 588(12): 2087-94, 2014 Jun 05.
Artículo en Inglés | MEDLINE | ID: mdl-24815697

RESUMEN

ERp57 participates in the regulation of calcium homeostasis. Although ERp57 modulates calcium flux across the plasma membrane and the endoplasmic reticulum membrane, its functions on mitochondria are largely unknown. Here, we found that ERp57 can regulate the expression of the mitochondrial calcium uniporter (MCU) and modulate mitochondrial calcium uptake. In ERp57-silenced HeLa cells, MCU was downregulated, and the mitochondrial calcium uptake was inhibited, consistent with the effect of MCU knockdown. When MCU was re-expressed in the ERp57 knockdown cells, mitochondrial calcium uptake was restored. Thus, ERp57 is a potent regulator of mitochondrial calcium homeostasis.


Asunto(s)
Canales de Calcio/metabolismo , Calcio/metabolismo , Mitocondrias/metabolismo , Proteína Disulfuro Isomerasas/metabolismo , Secuencia de Bases , Transporte Biológico , Canales de Calcio/genética , Regulación de la Expresión Génica , Células HeLa , Humanos , Potencial de la Membrana Mitocondrial , Proteína Disulfuro Isomerasas/deficiencia , Proteína Disulfuro Isomerasas/genética
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