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1.
Viruses ; 16(6)2024 May 31.
Artigo em Inglês | MEDLINE | ID: mdl-38932181

RESUMO

High pathogenicity avian influenza viruses (HPAIVs) cause high morbidity and mortality in poultry species. HPAIV prevalence means high numbers of infected wild birds could lead to spill over events for farmed poultry. How these pathogens survive in the environment is important for disease maintenance and potential dissemination. We evaluated the temperature-associated survival kinetics for five clade 2.3.4.4 H5Nx HPAIVs (UK field strains between 2014 and 2021) incubated at up to three temperatures for up to ten weeks. The selected temperatures represented northern European winter (4 °C) and summer (20 °C); and a southern European summer temperature (30 °C). For each clade 2.3.4.4 HPAIV, the time in days to reduce the viral infectivity by 90% at temperature T was established (DT), showing that a lower incubation temperature prolonged virus survival (stability), where DT ranged from days to weeks. The fastest loss of viral infectivity was observed at 30 °C. Extrapolation of the graphical DT plots to the x-axis intercept provided the corresponding time to extinction for viral decay. Statistical tests of the difference between the DT values and extinction times of each clade 2.3.4.4 strain at each temperature indicated that the majority displayed different survival kinetics from the other strains at 4 °C and 20 °C.


Assuntos
Vírus da Influenza A , Influenza Aviária , Temperatura , Animais , Influenza Aviária/virologia , Influenza Aviária/mortalidade , Vírus da Influenza A/patogenicidade , Vírus da Influenza A/genética , Vírus da Influenza A/classificação , Vírus da Influenza A/fisiologia , Cinética , Aves Domésticas/virologia , Animais Selvagens/virologia , Aves/virologia , Doenças das Aves Domésticas/virologia , Doenças das Aves Domésticas/mortalidade
3.
Vaccine ; 40(34): 4972-4978, 2022 08 12.
Artigo em Inglês | MEDLINE | ID: mdl-35820940

RESUMO

Bacille Calmette-Guerin (BCG) is a potential tool in the control of Mycobacterium bovis in European badgers (Meles meles). A five year Test and Vaccinate or Remove (TVR) research intervention project commenced in 2014 using two BCG strains (BCG Copenhagen 1331 (Years 1-3/ BadgerBCG) and BCG Sofia SL2222 (Years 4-5). Badgers were recaptured around 9 weeks after the Year 5 vaccination and then again a year later. The Dual-Path Platform (DPP) Vet TB assay was used to detect serological evidence of M. bovis infection. Of the 48 badgers, 47 had increased Line 1 readings (MPB83 antigen) between the Year 5 vaccination and subsequent recapture. The number of BCG Sofia vaccinations influenced whether a badger tested positive to the recapture DPP VetTB assay Line 1 (p < 0.001) while the number of BadgerBCG vaccinations did not significantly affect recapture Line 1 results (p = 0.59). Line 1 relative light units (RLU) were more pronounced in tests run with sera than whole blood. The results from an in_house MPB83 ELISA results indicated that the WB DPP VetTB assay may not detect lower MPB83 IgG levels as well as the serum DPP VetTB assay. Changes in interferon gamma assay (IFN-γ) results were seen in 2019 with significantly increased CFP-10 and PPDB readings. Unlike BadgerBCG, BCG Sofia induces an immune response to MPB83 (the immune dominant antigen in M. bovis badger infection) that then affects the use of immunodiagnostic tests. The use of the DPP VetTB assay in recaptured BCG Sofia vaccinated badgers within the same trapping season is precluded and caution should be used in badgers vaccinated with BCG Sofia in previous years. The results suggest that the DPP VetTB assay can be used with confidence in badgers vaccinated with BadgerBCG as a single or repeated doses.


Assuntos
Mustelidae , Mycobacterium bovis , Tuberculose Bovina , Animais , Vacina BCG , Bovinos , Testes Imunológicos , Tuberculose Bovina/prevenção & controle , Vacinação/veterinária
4.
AAPS J ; 24(3): 66, 2022 05 09.
Artigo em Inglês | MEDLINE | ID: mdl-35534647

RESUMO

Decades of discussion and publication have gone into the guidance from the scientific community and the regulatory agencies on the use and validation of pharmacokinetic and toxicokinetic assays by chromatographic and ligand binding assays for the measurement of drugs and metabolites. These assay validations are well described in the FDA Guidance on Bioanalytical Methods Validation (BMV, 2018). While the BMV included biomarker assay validation, the focus was on understanding the challenges posed in validating biomarker assays and the importance of having reliable biomarker assays when used for regulatory submissions, rather than definition of the appropriate experiments to be performed. Different from PK bioanalysis, analysis of biomarkers can be challenging due to the presence of target analyte(s) in the control matrices used for calibrator and quality control sample preparation, and greater difficulty in procuring appropriate reference standards representative of the endogenous molecule. Several papers have been published offering recommendations for biomarker assay validation. The situational nature of biomarker applications necessitates fit-for-purpose (FFP) assay validation. A unifying theme for FFP analysis is that method validation requirements be consistent with the proposed context of use (COU) for any given biomarker. This communication provides specific recommendations for biomarker assay validation (BAV) by LC-MS, for both small and large molecule biomarkers. The consensus recommendations include creation of a validation plan that contains definition of the COU of the assay, use of the PK assay validation elements that support the COU, and definition of assay validation elements adapted to fit biomarker assays and the acceptance criteria for both.


Assuntos
Bioensaio , Bioensaio/métodos , Biomarcadores/análise , Cromatografia Líquida/métodos , Espectrometria de Massas/métodos , Padrões de Referência
5.
AAPS J ; 24(2): 42, 2022 03 14.
Artigo em Inglês | MEDLINE | ID: mdl-35288790

RESUMO

The COVID-19 pandemic has strained the biological matrix supply chain. An upsurge in demand driven by numerous COVID-19 therapeutic and vaccine development programs to combat the pandemic, along with logistical challenges sourcing and transporting matrix, has led to increased lead times for multiple matrices. Biological matrix shortages can potentially cause significant delays in drug development programs across the pharmaceutical and biotechnology industry. Given the current circumstances, discussion is warranted around what will likely be increased use of surrogate matrices in support of pharmacokinetic (PK), immunogenicity, and biomarker assays for regulatory filings. Regulatory authorities permit the use of surrogate matrix in bioanalytical methods in instances where matrix is rare or difficult to obtain, as long as the surrogate is appropriately selected and scientifically justified. Herein, the scientific justification and possible regulatory implications of employing surrogate matrix in PK, immunogenicity, and biomarker assays are discussed. In addition, the unique challenges that cell and gene therapy (C>) and other innovative therapeutic modalities place on matrix supply chains are outlined. Matrix suppliers and contract research organizations (CROs) are actively implementing mitigation strategies to alleviate the current strain on the matrix supply chain and better prepare the industry for any future unexpected strains. To maintain ethical standards, these mitigation strategies include projecting matrix needs with suppliers at least 6 months in advance and writing or updating study protocols to allow for additional matrix draws from study subjects and/or re-purposing of subject matrix from one drug development program to another.


Assuntos
COVID-19 , Pandemias , Humanos
6.
PLoS One ; 16(1): e0246141, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33508004

RESUMO

A novel five year Test and Vaccinate or Remove (TVR) wildlife research intervention project in badgers (Meles meles) commenced in 2014 in a 100km2 area of Northern Ireland. It aimed to increase the evidence base around badgers and bovine TB and help create well-informed and evidence-based strategies to address the issue of cattle-to-cattle spread and spread between cattle and badgers. It involved real-time trap-side testing of captured badgers and vaccinating those that tested negative for bTB (BadgerBCG-BCG Danish 1331) and removal of those that tested bTB positive using the Dual-Path Platform VetTB test (DPP) for cervids (Chembio Diagnostic Systems, Medford, NY USA). Four diagnostic tests were utilised within the study interferon gamma release assay (IGRA), culture (clinical samples and post mortem), DPP using both whole blood and DPP using serum. BCG Sofia (SL222) was used in the final two years because of supply issues with BadgerBCG. Objectives for this study were to evaluate the performance of the DPP in field conditions and whether any trend was apparent in infection prevalence over the study period. A Bayesian latent class model of diagnostic test evaluation in the absence of a gold standard was applied to the data. Temporal variation in the sensitivity of DPP and interferon gamma release assay (IGRA) due to the impact of control measures was investigated using logistic regression and individual variability was assessed. Bayesian latent class analysis estimated DPP with serum to have a sensitivity of 0.58 (95% CrI: 0.40-0.76) and specificity of 0.97 (95% CrI: 0.95-0.98). The DPP with whole blood showed a higher sensitivity (0.69 (95% CrI: 0.48-0.88)) but similar specificity (0.98 (95% Crl: 0.96-0.99)). The change from BCG Danish to BCG Sofia significantly impacted on DPP serum test characteristics. In addition, there was weak evidence of increasing sensitivity of IGRA over time and differences in DPP test sensitivity between adults and cubs. An exponential decline model was an appropriate representation of the infection prevalence over the 5 years, with a starting prevalence of 14% (95% CrI: 0.10-0.20), and an annual reduction of 39.1% (95% CrI: 26.5-50.9). The resulting estimate of infection prevalence in year 5 of the study was 1.9% (95% CrI: 0.8-3.8). These results provide field evidence of a statistically significant reduction in badger TB prevalence supporting a TVR approach to badger intervention. They give confidence in the reliability and reproducibility in the DPP Whole Blood as a real time trap-side diagnostic test for badgers, and describe the effect of vaccination and reduced infection prevalence on test characteristics.


Assuntos
Animais Selvagens/microbiologia , Vacinas Bacterianas/farmacologia , Reservatórios de Doenças , Modelos Biológicos , Mustelidae/microbiologia , Mycobacterium bovis , Tuberculose Bovina , Vacinação , Animais , Teorema de Bayes , Bovinos , Tuberculose Bovina/epidemiologia , Tuberculose Bovina/prevenção & controle , Tuberculose Bovina/transmissão
7.
Sci Rep ; 10(1): 19441, 2020 11 10.
Artigo em Inglês | MEDLINE | ID: mdl-33173102

RESUMO

Since 2018, the EU commission has declared the Danish broiler industry to be Salmonella free. However, there is continuous Salmonella pressure from the environment, and a number of parent flocks and broiler flocks become infected annually. When a parent flock becomes infected, the infection can be transmitted vertically to the broiler flocks, before the parent flock is detected and destroyed, including the eggs at the hatchery. To address this issue, we developed stochastic dynamic modelling of transmission of Salmonella in parent flocks and combined that with the relation between flock prevalence and test sensitivity for environmental samples in the flock. Results suggested that after 10 and 100 infected hens were seeded, the likelihood of detecting an infected parent flock within the three first weeks after the infection was strongly influenced by the taking of five boot swabs (95% CI 70-100) instead of two (95% CI 40-100) or the supplementing of the two boot swabs by a dust sample (95% CI 43-100). Results suggest that the likelihood of detecting the broiler flock as infected in the program was estimated to at least 99% in broiler flock even if only one chicken was initially infected. These findings are of relevance for managing parent flocks and eggs at the hatchery in case of Salmonella infection in parent flocks in the Danish poultry.


Assuntos
Doenças das Aves Domésticas/microbiologia , Salmonelose Animal/diagnóstico , Salmonella/patogenicidade , Animais , Galinhas
8.
Sci Rep ; 10(1): 1740, 2020 02 03.
Artigo em Inglês | MEDLINE | ID: mdl-32015375

RESUMO

Many high-consequence human and animal pathogens persist in wildlife reservoirs. An understanding of the dynamics of these pathogens in their reservoir hosts is crucial to inform the risk of spill-over events, yet our understanding of these dynamics is frequently insufficient. Viral persistence in a wild bat population was investigated by combining empirical data and in-silico analyses to test hypotheses on mechanisms for viral persistence. A fatal zoonotic virus, European Bat lyssavirus type 2 (EBLV-2), in Daubenton's bats (Myotis daubentonii) was used as a model system. A total of 1839 M. daubentonii were sampled for evidence of virus exposure and excretion during a prospective nine year serial cross-sectional survey. Multivariable statistical models demonstrated age-related differences in seroprevalence, with significant variation in seropositivity over time and among roosts. An Approximate Bayesian Computation approach was used to model the infection dynamics incorporating the known host ecology. The results demonstrate that EBLV-2 is endemic in the study population, and suggest that mixing between roosts during seasonal swarming events is necessary to maintain EBLV-2 in the population. These findings contribute to understanding how bat viruses can persist despite low prevalence of infection, and why infection is constrained to certain bat species in multispecies roosts and ecosystems.


Assuntos
Comportamento Animal/fisiologia , Quirópteros/virologia , Lyssavirus/fisiologia , Infecções por Rhabdoviridae/transmissão , Animais , Estudos Transversais , Modelos Estatísticos , Estudos Soroepidemiológicos
9.
PLoS One ; 14(12): e0225250, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31869335

RESUMO

Vector borne diseases are a continuing global threat to both human and animal health. The ability of vectors such as mosquitos to cover large distances and cross country borders undetected provide an ever-present threat of pathogen spread. Many diseases can infect multiple vector species, such that even if the climate is not hospitable for an invasive species, indigenous species may be susceptible and capable of transmission such that one incursion event could lead to disease establishment in these species. Here we present a consensus modelling methodology to estimate the habitat suitability for presence of mosquito species in the UK deemed competent for Rift Valley fever virus (RVF) and demonstrate its application in an assessment of the relative risk of establishment of RVF virus in the UK livestock population. The consensus model utilises observed UK mosquito surveillance data, along with climatic and geographic prediction variables, to inform six independent species distribution models; the results of which are combined to produce a single prediction map. As a livestock host is needed to transmit RVF, we then combine the consensus model output with existing maps of sheep and cattle density to predict the areas of the UK where disease is most likely to establish in local mosquito populations. The model results suggest areas of high suitability for RVF competent mosquito species across the length and breadth of the UK. Notable areas of high suitability were the South West of England and coastal areas of Wales, the latter of which was subsequently predicted to be at higher risk for establishment of RVF due to higher livestock densities. This study demonstrates the applicability of outputs of species distribution models to help predict hot-spots for risk of disease establishment. While there is still uncertainty associated with the outputs we believe that the predictions are an improvement on just using the raw presence points from a database alone. The outputs can also be used as part of a multidisciplinary approach to inform risk based disease surveillance activities.


Assuntos
Distribuição Animal , Gado/virologia , Modelos Teóricos , Mosquitos Vetores/virologia , Febre do Vale de Rift/epidemiologia , Vírus da Febre do Vale do Rift , Animais , Clima , Surtos de Doenças , Vetores de Doenças , Reino Unido
10.
Bioanalysis ; 11(15): 1379-1382, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31490110

RESUMO

Biography Mark E Arnold, PhD, is Director of Science for Covance Laboratories. In that role, he develops the bioanalytical strategy for immune-, cell-based, quantitative polymerase chain reaction (qPCR) and LC-MS/MS assays to quantify drugs and metabolites, antidrug antibodies and biomarkers in animal and clinical samples for pharmacokinetic and pharmacodynamic assessments. Mark was previously Executive Director of Bioanalytical Sciences at Bristol-Myers Squibb. He received a BS (biology) from Indiana University of Pennsylvania and PhD (pharmacology) from the University of Pittsburgh. For more than 30 years, Mark has been involved in the evolving field of bioanalysis, including the science and the review and interpretation of regulations and guidance. He co-chaired the AAPS Crystal City V and VI Workshops on the US 'FDA Draft Revised Guidance on Bioanalytical Method Validation' and 'Biomarkers'. He is actively involved in the Land O'Lakes Bioanalytical Conference and American Association of Pharmaceutical Scientists (AAPS, named Fellow in 2014). Mark has over 100 peer-reviewed publications, and numerous invited podium presentations. This interview was conducted by Sankeetha Nadarajah, Managing Commissioning Editor of Bioanalysis.


Assuntos
Técnicas de Química Analítica , Guias como Assunto , Consenso , Documentação , Indústrias
12.
Euro Surveill ; 22(32)2017 Aug 10.
Artigo em Inglês | MEDLINE | ID: mdl-28816650

RESUMO

Transmissible spongiform encephalopathies (TSEs) are an important public health concern. Since the emergence of bovine spongiform encephalopathy (BSE) during the 1980s and its link with human Creutzfeldt-Jakob disease, active surveillance has been a key element of the European Union's TSE control strategy. Success of this strategy means that now, very few cases are detected compared with the number of animals tested. Refining surveillance strategies would enable resources to be redirected towards other public health priorities. Cost-effectiveness analysis was performed on several alternative strategies involving reducing the number of animals tested for BSE and scrapie in Great Britain and, for scrapie, varying the ratio of sheep sampled in the abattoir to fallen stock (which died on the farm). The most cost-effective strategy modelled for BSE involved reducing the proportion of fallen stock tested from 100% to 75%, producing a cost saving of ca GBP 700,000 per annum. If 50% of fallen stock were tested, a saving of ca GBP 1.4 million per annum could be achieved. However, these reductions are predicted to increase the period before surveillance can detect an outbreak. For scrapie, reducing the proportion of abattoir samples was the most cost-effective strategy modelled, with limited impact on surveillance effectiveness.


Assuntos
Análise Custo-Benefício , Surtos de Doenças/economia , Encefalopatia Espongiforme Bovina/epidemiologia , Vigilância da População/métodos , Scrapie/epidemiologia , Animais , Bovinos , Surtos de Doenças/veterinária , Encefalopatia Espongiforme Bovina/economia , Scrapie/economia , Reino Unido/epidemiologia
13.
J Pharm Biomed Anal ; 143: 9-16, 2017 Sep 05.
Artigo em Inglês | MEDLINE | ID: mdl-28544885

RESUMO

The oral absolute bioavailability of beclabuvir in healthy subjects was determined using a microdose (100µg) of the stable isotopically labeled tracer via intravenous (IV) infusion started after oral dosing of beclabuvir (150mg). To simultaneously analyze the concentrations of the IV microtracer ([13C6]beclabuvir) and beclabuvir in plasma samples, a liquid chromatography-triple quadrupole mass spectrometry (LC-MS/MS) method was initially developed. Surprisingly beclabuvir significantly interfered with the IV microtracer detection when using the selected reaction monitoring (SRM) in the assay. An interfering component from the drug substance was observed using a high resolution mass spectrometer (HRMS). The mass-to-charge (m/z) of the interfering component was -32ppm different from the nominal value for the IV microtracer and thus could not be differentiated in the SRM assay by the unit mass resolution. To overcome this interference, we evaluated two approaches by either monitoring an alternative product ion using the SRM assay or isolating the interfering component using the parallel reaction monitoring (PRM) assay on the HRMS. This case study has demonstrated two practical approaches for overcoming interferences with the detection of stable isotopically labeled IV microtracers in the evaluation of absolute bioavailability, which provides users the flexibility in using either LC-MS/MS or HRMS to mitigate unpredicted interferences in the assay to support microtracer absolute bioavailability studies.


Assuntos
Disponibilidade Biológica , Benzazepinas , Cromatografia Líquida , Indóis , Espectrometria de Massas em Tandem
14.
Prev Vet Med ; 138: 48-54, 2017 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-28237235

RESUMO

During the bovine spongiform encephalopathy (BSE) epidemic in July 2001 the European Commission established a surveillance scheme for the comprehensive sampling of all BSE clinical suspects, healthy slaughter (HS) animals >30months, and all emergency slaughter and fallen stock animals tested when >24months. With the exponential decline in classical BSE cases, this comprehensive surveillance system has been successively modified to become risk-based, targeting those exit streams and ages where cases from the original epidemic are most likely to be detected. Such reductions in testing are not without losses in the information subsequently collected, which could affect the sensitivity of the surveillance system to relatively small changes in the underlying prevalence of BSE across the European Union (EU). Here we report on a cohort-based approach to estimate the time taken for EU surveillance to observe a theoretical re-emergence of BSE in cattle. A number of surveillance schemes were compared. The baseline scheme considered detection being triggered by at least one case in the 'age window' 48-72 months in the fallen stock or emergency slaughter exit streams. Alternative schemes changed the start and end of this age window as well as considering testing for HS cattle. Under the baseline scheme, an estimated 15 years would lapse ([2.5th, 97.5th] percentiles=[10,24]) prior to detection, during which time 2867 infected animals ([2.5th, 97.5th]=[1722,6967]) would enter the slaughter population. These animals would be predominantly young animals (majority <24months) showing no clinical signs. This baseline scheme reduced the time to detection by 2 years, compared to a scheme where only clinical suspects were tested assuming BSE symptoms are recognised to the same degree by veterinary surgeons. Additional testing of younger animals did not improve detection as young infected animals were unlikely to test positive, but testing of older animals reduced the time to detection. Testing of HS animals >72months reduced the time to detection by one year compared to the baseline model, but would incur a high financial cost, e.g. testing HS animals >72months of age for 14 years would entail approximately 50.4 million additional tests. A limitation of the results is that there is no guarantee that current detection methods, optimised for detection of classical BSE, would identify a novel prion disease in cattle and it is currently difficult to envisage plausible routes by which a re-emergence of classical BSE could occur in Europe.


Assuntos
Encefalopatia Espongiforme Bovina/epidemiologia , Encefalopatia Espongiforme Bovina/prevenção & controle , Medição de Risco/métodos , Vigilância de Evento Sentinela/veterinária , Matadouros , Animais , Bovinos , Doenças Transmissíveis Emergentes/diagnóstico , Doenças Transmissíveis Emergentes/epidemiologia , Doenças Transmissíveis Emergentes/prevenção & controle , Doenças Transmissíveis Emergentes/veterinária , Surtos de Doenças/prevenção & controle , Surtos de Doenças/veterinária , Encefalopatia Espongiforme Bovina/diagnóstico , Europa (Continente)/epidemiologia , Modelos Biológicos
16.
Bioanalysis ; 8(23): 2429-2443, 2016 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-27855510

RESUMO

AIM: A UHPLC-MS/MS assay was developed to quantify urinary dehydroepiandrosterone (DHEA), 7ß-hydroxy-DHEA, cortisone and 6ß-hydroxycortisone as potential biomarkers to predict CYP3A activity. RESULTS: A sensitive assay at LLOQ of 0.500 ng/ml with good accuracy and precision was developed for the four analytes in human urine. This UHPLC-MS/MS assay was optimized by eliminating nonspecific loss of the analytes in urine, ensuring complete hydrolysis of the conjugates to unconjugated forms and use of the product ions of [M+H-H2O]+ for multiple reaction monitoring detection of DHEA and 7ß-hydroxy-DHEA. CONCLUSION: This assay was successfully applied to a pilot clinical study. It is also suitable for future drug-drug interaction studies to continue evaluating the potential of these steroids as biomarkers for CYP3A inhibition and induction.


Assuntos
Biomarcadores/urina , Cortisona/urina , Citocromo P-450 CYP3A/metabolismo , Desidroepiandrosterona/urina , Espectrometria de Massas em Tandem , Urinálise/métodos , Cromatografia Líquida de Alta Pressão/normas , Cortisona/metabolismo , Cortisona/normas , Citocromo P-450 CYP3A/química , Desidroepiandrosterona/metabolismo , Desidroepiandrosterona/normas , Interações Medicamentosas , Humanos , Hidroxilação , Limite de Detecção , Extração Líquido-Líquido , Controle de Qualidade , Espectrometria de Massas em Tandem/normas , Urinálise/instrumentação
18.
Bioanalysis ; 8(19): 1997-2005, 2016 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-27611058

RESUMO

BACKGROUND: Creatinine is an endogenous compound generated from creatine by normal muscular metabolism. It is an important indicator of renal function and the serum level is routinely monitored in clinical labs. Results & methodology: Surrogate analyte (d3-creatinine) was used for calibration standard and quality control preparation and the relative instrument response ratio between creatinine and d3-creatinine was used to calculate the endogenous creatinine concentrations. CONCLUSION: A fit-for-purpose strategy of using a surrogate analyte and authentic matrix was adopted for this validation. The assay was the first human plasma assay using such strategy and was successfully applied to a clinical study to confirm a transient elevation of creatinine observed using an existing clinical assay.


Assuntos
Análise Química do Sangue/métodos , Cromatografia Líquida de Alta Pressão , Creatinina/sangue , Espectrometria de Massas em Tandem , Biomarcadores/sangue , Calibragem , Cromatografia Líquida de Alta Pressão/normas , Creatinina/química , Creatinina/normas , Humanos , Controle de Qualidade , Espectrometria de Massas em Tandem/normas
19.
Anal Chim Acta ; 934: 170-9, 2016 Aug 31.
Artigo em Inglês | MEDLINE | ID: mdl-27506357

RESUMO

Dried saliva spot (DSS) sampling is a non-invasive sample collection technique for bioanalysis that can be potentially implemented at the patient's home. A UHPLC-MS/MS assay was developed using detergent-assisted sample extraction to quantify BMS-927711, a drug candidate in development for the treatment of migraines, in human DSS. By implementing DSS sampling at the patients' home, the bioanalytical sample collection for pharmacokinetic evaluation can be done at the time of the acute migraine attack without the need for clinical visits. DSS samples were prepared by spotting 15 µL of liquid saliva onto regular Whatman FTA™ DMPK-C cards and verified with a UV lamp (at λ 254 nm or 365 nm) during DSS punching. The 4-mm DSS punches in a 96-well plate were sonicated with 200 µL of [(13)C2, D4]-BMS-927711 internal standard (IS) solution in 20/80 MeOH/water for 10 min, followed by sonication with 50 µL of 100 mM NH4OAc with 1.0% Triton-X-100 (as detergent) prior to liquid-liquid extraction with 600 µL EtOAc/Hexane (90:10). UHPLC-MS/MS was performed with an Aquity(®) UPLC BEH C18 Column (2.1 × 50 mm, 1.7 µm) on a Triple Quad™ 5500 mass spectrometer. The assay was linear with a concentration range from 2.00 to 1000 ng mL(-1) for BMS-927711 in human saliva. The intra- and inter-assay precision was within 8.8% CV, and the accuracy was within ±6.7% Dev of the nominal concentration values. This UHPLC-MS/MS assay has been successfully applied to determine the drug's pharmacokinetics within a clinical study. For the first time, we observed BMS-927711 exposure in human DSS, confirming the suitability of this sampling technique for migraine patients to use at home. Detergent-assisted extraction with Triton-X-100 could be very useful in DSS or other dried matrix spot (DMS) assays to overcome low or inconsistent analyte recovery issues.


Assuntos
Detergentes/química , Piperidinas/análise , Piridinas/análise , Saliva/química , Cromatografia Líquida de Alta Pressão , Humanos , Extração Líquido-Líquido , Espectrometria de Massas em Tandem
20.
AAPS J ; 18(6): 1366-1372, 2016 11.
Artigo em Inglês | MEDLINE | ID: mdl-27514862

RESUMO

With the growing focus on translational research and the use of biomarkers to drive drug development and approvals, biomarkers have become a significant area of research within the pharmaceutical industry. However, until the US Food and Drug Administration's (FDA) 2013 draft guidance on bioanalytical method validation included consideration of biomarker assays using LC-MS and LBA, those assays were created, validated, and used without standards of performance. This lack of expectations resulted in the FDA receiving data from assays of varying quality in support of efficacy and safety claims. The AAPS Crystal City VI (CC VI) Workshop in 2015 was held as the first forum for industry-FDA discussion around the general issues of biomarker measurements (e.g., endogenous levels) and specific technology strengths and weaknesses. The 2-day workshop served to develop a common understanding among the industrial scientific community of the issues around biomarkers, informed the FDA of the current state of the science, and will serve as a basis for further dialogue as experience with biomarkers expands with both groups.


Assuntos
Bioensaio/normas , Indústria Farmacêutica/normas , Educação/normas , Controle de Qualidade , Relatório de Pesquisa/normas , United States Food and Drug Administration/normas , Bioensaio/tendências , Biomarcadores , Indústria Farmacêutica/tendências , Educação/tendências , Humanos , Reprodutibilidade dos Testes , Relatório de Pesquisa/tendências , Estados Unidos , United States Food and Drug Administration/tendências , Virginia
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