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1.
Hepatology ; 69(2): 760-773, 2019 02.
Artículo en Inglés | MEDLINE | ID: mdl-29357190

RESUMEN

Current blood biomarkers are suboptimal in detecting drug-induced liver injury (DILI) and predicting its outcome. We sought to characterize the natural variabilty and performance characteristics of 14 promising DILI biomarker candidates. Serum or plasma from multiple cohorts of healthy volunteers (n = 192 and n = 81), subjects who safely took potentially hepatotoxic drugs without adverse effects (n = 55 and n = 92) and DILI patients (n = 98, n = 28, and n = 143) were assayed for microRNA-122 (miR-122), glutamate dehydrogenase (GLDH), total cytokeratin 18 (K18), caspase cleaved K18, glutathione S-transferase α, alpha-fetoprotein, arginase-1, osteopontin (OPN), sorbitol dehydrogenase, fatty acid binding protein, cadherin-5, macrophage colony-stimulating factor receptor (MCSFR), paraoxonase 1 (normalized to prothrombin protein), and leukocyte cell-derived chemotaxin-2. Most candidate biomarkers were significantly altered in DILI cases compared with healthy volunteers. GLDH correlated more closely with gold standard alanine aminotransferase than miR-122, and there was a surprisingly wide inter- and intra-individual variability of miR-122 levels among healthy volunteers. Serum K18, OPN, and MCSFR levels were most strongly associated with liver-related death or transplantation within 6 months of DILI onset. Prediction of prognosis among DILI patients using the Model for End-Stage Liver Disease was improved by incorporation of K18 and MCSFR levels. Conclusion: GLDH appears to be more useful than miR-122 in identifying DILI patients, and K18, OPN, and MCSFR are promising candidates for prediction of prognosis during an acute DILI event. Serial assessment of these biomarkers in large prospective studies will help further delineate their role in DILI diagnosis and management.


Asunto(s)
Biomarcadores/sangre , Enfermedad Hepática Inducida por Sustancias y Drogas/sangre , Adulto , Estudios de Casos y Controles , Enfermedad Hepática Inducida por Sustancias y Drogas/diagnóstico , Enfermedad Hepática Inducida por Sustancias y Drogas/etiología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Pronóstico
2.
Int J Toxicol ; 34(4): 346-8, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-25804424

RESUMEN

Risk assessment, in the context of public health, is the process of quantifying the probability of a harmful effect to individuals or populations from human activities. With increasing public health concern regarding the potential risks associated with chemical exposure, there is a need for more predictive and accurate approaches to risk assessment. Developing such an approach requires a mechanistic understanding of the process by which xenobiotic substances perturb biological systems and lead to toxicity. Supplementing the shortfalls of traditional risk assessment with mechanistic biological data has been widely discussed but not routinely implemented in the evaluation of chemical exposure. These mechanistic approaches to risk assessment have been generally referred to as systems toxicology. This Symposium Overview article summarizes 4 talks presented at the 35th Annual Meeting of the American College of Toxicology.


Asunto(s)
Exposición a Riesgos Ambientales , Medición de Riesgo , Toxicología , Xenobióticos/toxicidad , Animales , Congresos como Asunto , Modelos Animales de Enfermedad , Sustancias Peligrosas/toxicidad , Humanos
3.
J Pharmacokinet Pharmacodyn ; 41(6): 545-52, 2014 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-25288257

RESUMEN

Medical-product development has become increasingly challenging and resource-intensive. In 2004, the Food and Drug Administration (FDA) described critical challenges facing medical-product development by establishing the critical path initiative [1]. Priorities identified included the need for improved modeling and simulation tools, further emphasized in FDA's 2011 Strategic Plan for Regulatory Science [Appendix]. In an effort to support and advance model-informed medical-product development (MIMPD), the Critical Path Institute (C-Path) [www.c-path.org], FDA, and International Society of Pharmacometrics [www.go-isop.org] co-sponsored a workshop in Washington, D.C. on September 26, 2013, to examine integrated approaches to developing and applying model- MIMPD. The workshop brought together an international group of scientists from industry, academia, FDA, and the European Medicines Agency to discuss MIMPD strategies and their applications. A commentary on the proceedings of that workshop is presented here.


Asunto(s)
Descubrimiento de Drogas/métodos , Preparaciones Farmacéuticas/química , Simulación por Computador , Toma de Decisiones , Humanos , Modelos Biológicos , Modelos Teóricos , Estados Unidos , United States Food and Drug Administration
4.
JID Innov ; 4(2): 100262, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-38445232

RESUMEN

Previous work done by our laboratory described the use of an immunocompetent spontaneous melanoma-prone mouse model, TGS (TG-3/SKH-1), to evaluate treatment outcomes using inhibitors of glutamatergic signaling and immune checkpoint for 18 weeks. We showed a significant therapeutic efficacy with a notable sex-biased response in male mice. In this follow-up 18-week study, the dose of the glutamatergic signaling inhibitor was increased (from 1.7 mg/kg to 25 mg/kg), which resulted in improved responses in female mice but not male mice. The greatest reduction in tumor progression was observed in male mice treated with single-agent troriluzole and anti-PD-1. Furthermore, a randomly selected group of mice was removed from treatment after 18 weeks and maintained for up to an additional 48 weeks demonstrating the utility of the TGS mouse model to perform a ≥1-year preclinical therapeutic study in a physiologically relevant tumor-host environment. Digital spatial imaging analyses were performed in tumors and tumor microenvironments across treatment modalities using antibody panels for immune cell types and immune cell activation. The results suggest that immune cell populations and cytotoxic activities of T cells play critical roles in treatment responses in these mice. Examination of a group of molecular protein markers based on the proposed mechanisms of action of inhibitors of glutamatergic signaling and immune checkpoint showed that alterations in expression levels of xCT, γ-H2AX, EAAT2, PD-L1, and PD-1 are likely associated with the loss of treatment responses. These results suggest the importance of tracking changes in molecular markers associated with the mechanism of action of therapeutics over the course of a longitudinal preclinical therapeutic study in spatial and temporal manners.

6.
Bioorg Med Chem Lett ; 23(16): 4674-9, 2013 Aug 15.
Artículo en Inglés | MEDLINE | ID: mdl-23856050

RESUMEN

The structure activity relationship of the prime region of conformationally restricted hydroxyethylamine (HEA) BACE inhibitors is described. Variation of the P1' region provided selectivity over Cat-D with a series of 2,2-dioxo-isothiochromanes and optimization of the P2' substituent of chromane-HEA(s) with polar substituents provided improvements in the compound's in vitro permeability. Significant potency gains were observed with small aliphatic substituents such as methyl, n-propyl, and cyclopropyl when placed at the C-2 position of the chromane.


Asunto(s)
Secretasas de la Proteína Precursora del Amiloide/antagonistas & inhibidores , Ácido Aspártico Endopeptidasas/antagonistas & inhibidores , Cromanos/química , Diseño de Fármacos , Inhibidores Enzimáticos/síntesis química , Sitios de Unión , Células Cultivadas , Etilaminas/síntesis química , Etilaminas/química , Etilaminas/farmacología , Concentración 50 Inhibidora , Modelos Moleculares , Relación Estructura-Actividad
8.
F1000Res ; 112022.
Artículo en Inglés | MEDLINE | ID: mdl-35602243

RESUMEN

Integrative drug safety research in translational health informatics has rapidly evolved and included data that are drawn in from many resources, combining diverse data that are either reused from (curated) repositories, or newly generated at source. Each resource is mandated by different sets of metadata rules that are imposed on the incoming data. Combination of the data cannot be readily achieved without interference of data stewardship and the top-down policy guidelines that supervise and inform the process for data combination to aid meaningful interpretation and analysis of such data. The eTRANSAFE Consortium's effort to drive integrative drug safety research at a large scale hereby present the lessons learnt and the proposal of solution at the guidelines in practice at this Innovative Medicines Initiative (IMI) project. Recommendations in these guidelines were compiled from feedback received from key stakeholders in regulatory agencies, EFPIA companies, and academic partners. The research reproducibility guidelines presented in this study lay the foundation for a comprehensive data sharing and knowledge management plans accounting for research data management in the drug safety space - FAIR data sharing guidelines, and the model verification guidelines as generic deliverables that best practices that can be reused by other scientific community members at large. FAIR data sharing is a dynamic landscape that rapidly evolves with fast-paced technology advancements. The research reproducibility in drug safety guidelines introduced in this study provides a reusable framework that can be adopted by other research communities that aim to integrate public and private data in biomedical research space.


Asunto(s)
Investigación Biomédica , Sector Público , Difusión de la Información , Metadatos , Reproducibilidad de los Resultados
9.
Bioorg Med Chem Lett ; 21(12): 3715-20, 2011 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-21571529

RESUMEN

Herein we describe the structure-activity relationship (SAR) of amino-caprolactam analogs derived from amino-caprolactam benzene sulfonamide 1, highlighting affects on the potency of γ-secretase inhibition, selectivity for the inhibition of APP versus Notch processing by γ-secretase and selected pharmakokinetic properties. Amino-caprolactams that are efficacious in reducing the cortical Aß(x-40) levels in FVB mice via a single 100 mpk IP dose are highlighted.


Asunto(s)
Secretasas de la Proteína Precursora del Amiloide/antagonistas & inhibidores , Caprolactama/análogos & derivados , Inhibidores Enzimáticos/farmacología , Enfermedad de Alzheimer/tratamiento farmacológico , Péptidos beta-Amiloides/metabolismo , Animales , Caprolactama/síntesis química , Caprolactama/química , Caprolactama/farmacología , Activación Enzimática/efectos de los fármacos , Inhibidores Enzimáticos/síntesis química , Infusiones Parenterales , Concentración 50 Inhibidora , Ratones , Estructura Molecular , Fragmentos de Péptidos/metabolismo
10.
Bioorg Med Chem Lett ; 21(12): 3726-9, 2011 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-21570836

RESUMEN

In this Letter, we describe the evolution of selective JNK3 inhibitors from 1, that routinely exhibit >10-fold selectivity over JNK1 and >1000-fold selectivity over related MAPKs. Strong SAR was found for substitution of the naphthalene ring, as well as for inhibitors adopting different central scaffolds. Significant potency gains were appreciated by inverting the polarity of the thione of the parent triazolothione 1, resulting in potent compounds with attractive pharmacokinetic profiles.


Asunto(s)
Inhibidores Enzimáticos/farmacología , Proteína Quinasa 10 Activada por Mitógenos/antagonistas & inhibidores , Naftalenos/síntesis química , Tionas/síntesis química , Animales , Células Cultivadas , Activación Enzimática/efectos de los fármacos , Inhibidores Enzimáticos/síntesis química , Inhibidores Enzimáticos/química , Humanos , Concentración 50 Inhibidora , Ratones , Microsomas Hepáticos/enzimología , Estructura Molecular , Naftalenos/química , Naftalenos/farmacología , Solubilidad , Relación Estructura-Actividad , Tionas/química , Tionas/farmacología
11.
Bioorg Med Chem Lett ; 21(19): 5791-4, 2011 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-21885276

RESUMEN

The structure-activity relationship (SAR) of a novel, potent and metabolically stable series of sulfonamide-pyrazoles that attenuate ß-amyloid peptide synthesis via γ-secretase inhibition is detailed herein. Sulfonamide-pyrazoles that are efficacious in reducing the cortical Aßx-40 levels in FVB mice via a single PO dose, as well as sulfonamide-pyrazoles that exhibit selectivity for inhibition of APP versus Notch processing by γ-secretase, are highlighted.


Asunto(s)
Secretasas de la Proteína Precursora del Amiloide/antagonistas & inhibidores , Precursor de Proteína beta-Amiloide/antagonistas & inhibidores , Diseño de Fármacos , Inhibidores Enzimáticos/síntesis química , Inhibidores Enzimáticos/farmacología , Compuestos Heterocíclicos con 3 Anillos/síntesis química , Compuestos Heterocíclicos con 3 Anillos/farmacología , Sulfonamidas/síntesis química , Sulfonamidas/farmacología , Péptidos beta-Amiloides/metabolismo , Animales , Evaluación Preclínica de Medicamentos , Inhibidores Enzimáticos/química , Compuestos Heterocíclicos con 3 Anillos/química , Concentración 50 Inhibidora , Ratones , Ratones Endogámicos , Relación Estructura-Actividad , Sulfonamidas/química
12.
Bioorg Med Chem Lett ; 21(6): 1838-43, 2011 Mar 15.
Artículo en Inglés | MEDLINE | ID: mdl-21316234

RESUMEN

The SAR of a series of tri-substituted thiophene JNK3 inhibitors is described. By optimizing both the N-aryl acetamide region of the inhibitor and the 4-position of the thiophene we obtained single digit nanomolar compounds, such as 47, which demonstrated an in vivo effect on JNK activity when dosed orally in our kainic acid mouse model as measured by phospho-c-jun reduction.


Asunto(s)
Encéfalo/metabolismo , MAP Quinasa Quinasa 4/antagonistas & inhibidores , Inhibidores de Proteínas Quinasas/química , Inhibidores de Proteínas Quinasas/farmacocinética , Administración Oral , Diseño de Fármacos , Enlace de Hidrógeno , Modelos Moleculares , Inhibidores de Proteínas Quinasas/síntesis química , Relación Estructura-Actividad
13.
Bioorg Med Chem Lett ; 21(1): 315-9, 2011 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-21112785

RESUMEN

In this Letter, we describe the discovery of selective JNK2 and JNK3 inhibitors, such as 10, that routinely exhibit >10-fold selectivity over JNK1 and >1000-fold selectivity over related MAPKs, p38α and ERK2. Substitution of the naphthalene ring affords an isoform selective JNK3 inhibitor, 30, with approximately 10-fold selectivity over both JNK1 and JNK2. A naphthalene ring penetrates deep into the selectivity pocket accounting for the differentiation amongst the kinases. Interestingly, the gatekeeper Met146 sulfide interacts with the naphthalene ring in a sulfur-π stacking interaction. Compound 38 ameliorates neurotoxicity induced by amyloid-ß in human cortical neurons. Lastly, we demonstrate how to install propitious in vitro CNS-like properties into these selective inhibitors.


Asunto(s)
Aminopiridinas/química , Proteína Quinasa 10 Activada por Mitógenos/antagonistas & inhibidores , Proteína Quinasa 9 Activada por Mitógenos/antagonistas & inhibidores , Enfermedades Neurodegenerativas/tratamiento farmacológico , Fármacos Neuroprotectores/química , Inhibidores de Proteínas Quinasas/química , Triazinas/química , Aminopiridinas/farmacocinética , Aminopiridinas/uso terapéutico , Animales , Sitios de Unión , Sistema Nervioso Central/metabolismo , Simulación por Computador , Humanos , Ratones , Microsomas Hepáticos/metabolismo , Proteína Quinasa 10 Activada por Mitógenos/metabolismo , Proteína Quinasa 9 Activada por Mitógenos/metabolismo , Fármacos Neuroprotectores/farmacocinética , Fármacos Neuroprotectores/uso terapéutico , Inhibidores de Proteínas Quinasas/farmacocinética , Inhibidores de Proteínas Quinasas/uso terapéutico , Relación Estructura-Actividad , Triazinas/farmacocinética , Triazinas/uso terapéutico
14.
Bioorg Med Chem Lett ; 21(18): 5521-7, 2011 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-21813278
15.
Exp Biol Med (Maywood) ; 246(22): 2391-2398, 2021 11.
Artículo en Inglés | MEDLINE | ID: mdl-33757340

RESUMEN

Safety biomarkers are important drug development tools, both preclinically and clinically. It is a straightforward process to correlate the performance of nonclinical safety biomarkers with histopathology, and ideally, the biomarker is useful in all species commonly used in safety assessment. In clinical validation studies, where histopathology is not feasible, safety biomarkers are compared to the response of standard biomarkers and/or to clinical adjudication. Worldwide, regulatory agencies have put in place processes to qualify biomarkers to provide confidence in the manner of use and interpretation of biomarker data in drug development studies. This paper describes currently qualified safety biomarkers which can be utilized to monitor for nephrotoxicity and cardiotoxicity and ongoing projects to qualify safety biomarkers for liver, skeletal muscle, and vascular injury. In many cases, the development and use of these critical drug development tools is dependent upon partnerships and the precompetitive sharing of data to support qualification efforts.


Asunto(s)
Biomarcadores Farmacológicos/análisis , Desarrollo de Medicamentos/normas , Efectos Colaterales y Reacciones Adversas Relacionados con Medicamentos/diagnóstico , Animales , Cardiotoxicidad/diagnóstico , Enfermedad Hepática Inducida por Sustancias y Drogas/diagnóstico , Desarrollo de Medicamentos/métodos , Humanos , Ratas , Estados Unidos , United States Food and Drug Administration/normas
16.
Antibiotics (Basel) ; 11(1)2021 Dec 30.
Artículo en Inglés | MEDLINE | ID: mdl-35052918

RESUMEN

Antimicrobial peptides (AMPs) have recently gained attention for their potential to treat diseases related to bacterial and viral infections, as many traditional antimicrobial drugs have reduced efficacy in treating these infections due to the increased prevalence of drug-resistant pathogens. PLG0206, an engineered cationic antibiotic peptide that is 24 residues long, has been designed to address some limitations of other natural AMPs, such as toxicity and limited activity due to pH and ion concentrations. Nonclinical studies have shown that PLG0206 is highly selective for targeting bacterial cells and is not toxic to human blood cells. Antibiofilm experiments demonstrated that PLG0206 is effective at reducing both biotic and abiotic biofilm burdens following direct biofilm contact. PLG0206 has rapid and broad-spectrum activity against both Gram-positive and Gram-negative bacteria that are implicated as etiologic agents in periprosthetic joint infections, including multidrug-resistant ESKAPE pathogens and colistin-resistant isolates. A recent first-in-human study demonstrated that PLG0206 is well tolerated and safe as an intravenous infusion in healthy volunteers. Studies are planned to determine the efficacy of PLG0206 in patients for the treatment of periprosthetic joint infections. This review summarizes the chemistry, pharmacology, and microbiology of PLG0206 and explores its current preclinical, clinical, and regulatory status.

17.
Biomark Med ; 15(9): 669-684, 2021 06.
Artículo en Inglés | MEDLINE | ID: mdl-34037457

RESUMEN

Qualification of a biomarker for use in a medical product development program requires a statistical strategy that aligns available evidence with the proposed context of use (COU), identifies any data gaps to be filled and plans any additional research required to support the qualification. Accumulating, interpreting and analyzing available data is outlined, step-by-step, illustrated by a qualified enrichment biomarker example and a safety biomarker in the process of qualification. The detailed steps aid requestors seeking qualification of biomarkers, allowing them to organize the available evidence and identify potential gaps. This provides a statistical perspective for assessing evidence that parallels clinical considerations and is intended to guide the overall evaluation of evidentiary criteria to support a specific biomarker COU.


Asunto(s)
Biomarcadores Farmacológicos/análisis , Industria Farmacéutica/normas , Sector de Atención de Salud/normas , Sector de Atención de Salud/tendencias , Modelos Estadísticos , Preparaciones Farmacéuticas/análisis , Humanos , Estados Unidos , United States Food and Drug Administration
18.
Open Heart ; 8(1)2021 03.
Artículo en Inglés | MEDLINE | ID: mdl-33762424

RESUMEN

Cardiac disease is now the leading cause of death in Duchenne muscular dystrophy (DMD). Clinical evaluations over time have demonstrated asymptomatic cardiac troponin elevations and acute elevations are associated with symptoms and cardiac dysfunction in DMD. Clinicians require a better understanding of the relationship of symptoms, troponin levels and progression of cardiac disease in DMD. As clinical trials begin to assess novel cardiac therapeutics in DMD, troponin levels in DMD are important for safety monitoring and outcome measures. The Parent Project Muscular Dystrophy convened an expert panel of cardiologists, scientists, and regulatory and industry specialists on 16 December 2019 in Silver Spring, Maryland and reviewed published and unpublished data from their institutions. The panel recommended retrospective troponin data analyses, prospective longitudinal troponin collection using high-sensitivity cardiac troponin I assays, inclusion of troponin in future clinical trial outcomes and future development of clinical guidelines for monitoring and treating troponin elevations in DMD.


Asunto(s)
Cardiomiopatías/sangre , Distrofia Muscular de Duchenne/sangre , Padres , Guías de Práctica Clínica como Asunto , Troponina I/sangre , Biomarcadores/sangre , Cardiomiopatías/diagnóstico , Cardiomiopatías/etiología , Progresión de la Enfermedad , Ecocardiografía , Humanos , Distrofia Muscular de Duchenne/complicaciones
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