The EU Commission proposal for a new EU pharmaceutical legislation considers PBT (persistence-bioaccumulation-toxicity) and PMT (persistence-mobility-toxicity) criteria for pharmaceuticals. Under current environmental risk assessment guidance, a PBT assessment is required regardless of the predicted environmental concentrations. However, consumption volumes of pharmaceuticals are contingent on marketing approval by EMA and are therefore predictable and their toxicological potency is established prior to any regulatory approval. Consumption volume and toxicological potency of pharmaceuticals span many orders of magnitude and are strong risk determinants. Routine data generation to evaluate persistence, mobility and bioaccumulation hazards as a means of pinpointing pharmaceuticals of increased environmental concern is therefore of questionable added value.
We present options to derive action triggers for PBT and/or PMT screening using exposure predictions and toxicological potency data. Our simulations demonstrate that an exposure-based action limit can be established as a trigger for PMT assessment, while a combined trigger based on exposure levels and mammalian toxicity is proposed for PBT assessment. The proposed approach is conservatively designed to ensure that compounds with any potential risks a) of secondary poisoning (main concern for PBT substances) and b) to groundwater/drinking water (main concern for PMT substances) are targeted for full evaluation.
{"title":"PBT/PMT assessment of active pharmaceutical ingredients","authors":"Gemma Janer , Joanne Elmoznino , Andreas Häner , Irene Bramke","doi":"10.1016/j.yrtph.2025.105772","DOIUrl":"10.1016/j.yrtph.2025.105772","url":null,"abstract":"<div><div>The EU Commission proposal for a new EU pharmaceutical legislation considers PBT (persistence-bioaccumulation-toxicity) and PMT (persistence-mobility-toxicity) criteria for pharmaceuticals. Under current environmental risk assessment guidance, a PBT assessment is required regardless of the predicted environmental concentrations. However, consumption volumes of pharmaceuticals are contingent on marketing approval by EMA and are therefore predictable and their toxicological potency is established prior to any regulatory approval. Consumption volume and toxicological potency of pharmaceuticals span many orders of magnitude and are strong risk determinants. Routine data generation to evaluate persistence, mobility and bioaccumulation hazards as a means of pinpointing pharmaceuticals of increased environmental concern is therefore of questionable added value.</div><div>We present options to derive action triggers for PBT and/or PMT screening using exposure predictions and toxicological potency data. Our simulations demonstrate that an exposure-based action limit can be established as a trigger for PMT assessment, while a combined trigger based on exposure levels and mammalian toxicity is proposed for PBT assessment. The proposed approach is conservatively designed to ensure that compounds with any potential risks a) of secondary poisoning (main concern for PBT substances) and b) to groundwater/drinking water (main concern for PMT substances) are targeted for full evaluation.</div></div>","PeriodicalId":20852,"journal":{"name":"Regulatory Toxicology and Pharmacology","volume":"156 ","pages":"Article 105772"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143010627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-28DOI: 10.1016/j.yrtph.2025.105776
Patricia Parris , Geraldine Whelan , Martyn L. Chilton , Claire Beaumont , Anders Burild , Uma Bruen , Courtney Callis , Jessica Graham , Natalia Kovalova , Elizabeth A. Martin , Melisa Masuda-Herrera , Carsten Worsøe , Anissa Alami , Joel Bercu , Dvir Doron , Kristen Dusenbury , Qiang Fu , Troy Griffin , Jedd Hillegass , Esther Johann , Lee Nagao
The Extractables and Leachables Safety Information Exchange (ELSIE) Consortium added to the sensitization potency analysis of Parris et al. (2023) by including the Product Quality Research Institute (PQRI) extractable and leachable dataset (Johnson et al., 2024; Product Quality Research Institute, 2021). This analysis of the comprehensive E&L dataset showed 5% of chemicals (20/407) had experimental results demonstrating or were predicted to be potent (strong or extreme) sensitizers, supporting the previous conclusion, that potent sensitizers are of low prevalence and are not routinely observed as leachables in pharmaceutical products. By accounting for prevalence of sensitization in the overall E&L dataset, the probability of any potential leachable being more potent than the less than lifetime ICH M7 (10, 20, and 120 μg/day for human exposure of >1–10 years, >1–12 months, and <1 month respectively) and non-mutagenic ELSIE threshold values (35, 110, and 180 μg/day for human exposures of >10 years to lifetime, >1–10 years, and ≤1 year respectively) (Masuda-Herrera et al., 2022) was considered. The M7 and ELSIE thresholds are anticipated to provide ≥95% coverage of induction of sensitization, supporting the use of these thresholds to set the Safety Concern Threshold (SCT).
{"title":"Comprehensive extractables and leachables sensitization analysis and practical application of a risk-based approach to sensitization assessment for parenteral drug products","authors":"Patricia Parris , Geraldine Whelan , Martyn L. Chilton , Claire Beaumont , Anders Burild , Uma Bruen , Courtney Callis , Jessica Graham , Natalia Kovalova , Elizabeth A. Martin , Melisa Masuda-Herrera , Carsten Worsøe , Anissa Alami , Joel Bercu , Dvir Doron , Kristen Dusenbury , Qiang Fu , Troy Griffin , Jedd Hillegass , Esther Johann , Lee Nagao","doi":"10.1016/j.yrtph.2025.105776","DOIUrl":"10.1016/j.yrtph.2025.105776","url":null,"abstract":"<div><div>The Extractables and Leachables Safety Information Exchange (ELSIE) Consortium added to the sensitization potency analysis of Parris et al. (2023) by including the Product Quality Research Institute (PQRI) extractable and leachable dataset (Johnson et al., 2024; Product Quality Research Institute, 2021). This analysis of the comprehensive E&L dataset showed 5% of chemicals (20/407) had experimental results demonstrating or were predicted to be potent (strong or extreme) sensitizers, supporting the previous conclusion, that potent sensitizers are of low prevalence and are not routinely observed as leachables in pharmaceutical products. By accounting for prevalence of sensitization in the overall E&L dataset, the probability of any potential leachable being more potent than the less than lifetime ICH M7 (10, 20, and 120 μg/day for human exposure of >1–10 years, >1–12 months, and <1 month respectively) and non-mutagenic ELSIE threshold values (35, 110, and 180 μg/day for human exposures of >10 years to lifetime, >1–10 years, and ≤1 year respectively) (Masuda-Herrera et al., 2022) was considered. The M7 and ELSIE thresholds are anticipated to provide ≥95% coverage of induction of sensitization, supporting the use of these thresholds to set the Safety Concern Threshold (SCT).</div></div>","PeriodicalId":20852,"journal":{"name":"Regulatory Toxicology and Pharmacology","volume":"157 ","pages":"Article 105776"},"PeriodicalIF":3.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143066288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-18DOI: 10.1016/j.yrtph.2025.105773
James R. Wheeler , Raechel Puglisi , Adriana C. Bejarano , Zhenglei Gao , Laurent Lagadic , Scott Glaberman , Constance A. Mitchell , Natalie Burden , Valentin Mingo , Scott G. Lynn , Michelle R. Embry
The amphibian metamorphosis assay (AMA) is an in vivo screen to assess potential interactions of chemicals with the amphibian thyroid system. Tadpoles are exposed for 21-days, then assessed for development and growth after 7 days and at test termination. This paper presents data from studies performed to satisfy test orders from the US EPA's Endocrine Disruptor Screening Program. Data Evaluation Records were used to collate the control variability and performance of biological endpoints in AMAs conducted in different laboratories, then supplemented with recent studies. We examine the statistical power of AMA endpoint analysis and assess whether historical control data (HCD) can assist evidence-based interpretation of the endpoints, with 52 studies from 7 different laboratories. HCD can be used to understand assay performance post validation. The analysis identifies some need for flexibility in the interpretation of the Test Guidelines' performance criteria, including latitude with analytical variability and statistical analysis of late-stage animals. Additionally, more guidance is suggested for feed regiments and the selection criteria for batches of animals to initiate the assay. Potential Guideline refinements that improve interpretation of the data and have potential to reduce the number of vertebrate animals used in the conduct of AMAs are identified and discussed.
{"title":"Control performance of Amphibian Metamorphosis Assays with Xenopus laevis","authors":"James R. Wheeler , Raechel Puglisi , Adriana C. Bejarano , Zhenglei Gao , Laurent Lagadic , Scott Glaberman , Constance A. Mitchell , Natalie Burden , Valentin Mingo , Scott G. Lynn , Michelle R. Embry","doi":"10.1016/j.yrtph.2025.105773","DOIUrl":"10.1016/j.yrtph.2025.105773","url":null,"abstract":"<div><div>The amphibian metamorphosis assay (AMA) is an <em>in vivo</em> screen to assess potential interactions of chemicals with the amphibian thyroid system. Tadpoles are exposed for 21-days, then assessed for development and growth after 7 days and at test termination. This paper presents data from studies performed to satisfy test orders from the US EPA's Endocrine Disruptor Screening Program. Data Evaluation Records were used to collate the control variability and performance of biological endpoints in AMAs conducted in different laboratories, then supplemented with recent studies. We examine the statistical power of AMA endpoint analysis and assess whether historical control data (HCD) can assist evidence-based interpretation of the endpoints, with 52 studies from 7 different laboratories. HCD can be used to understand assay performance post validation. The analysis identifies some need for flexibility in the interpretation of the Test Guidelines' performance criteria, including latitude with analytical variability and statistical analysis of late-stage animals. Additionally, more guidance is suggested for feed regiments and the selection criteria for batches of animals to initiate the assay. Potential Guideline refinements that improve interpretation of the data and have potential to reduce the number of vertebrate animals used in the conduct of AMAs are identified and discussed.</div></div>","PeriodicalId":20852,"journal":{"name":"Regulatory Toxicology and Pharmacology","volume":"157 ","pages":"Article 105773"},"PeriodicalIF":3.0,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143010607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-28DOI: 10.1016/j.yrtph.2024.105753
Tomal Dattaroy, Manish R Shukla
The current trend happens to be that consumers are seeking nourishing, high quality sustainable protein sources to meet their nutritional needs, thus establishing a clear intent to broaden their protein horizon. Microalgae protein holds great promise in becoming the next vegan protein option. In the present study, protein extracted from the microalga Picochlorum maculatum has been thoroughly evaluated for its safety for human consumption through a battery of in-vivo and in-vitro tests. Bacterial reverse mutation assay indicates that the test substance is non-mutagenic and studies comprising of in-vitro chromosomal aberration test and the in-vivo mammalian micronucleus test showed that the test item is non-clastogenic, and therefore, lacks genotoxicity. Based the results of an acute oral toxicity study, the test item can be classified as "Category 5" as designated in a globally harmonized system for classification of chemicals. Further, 28-day and 90-day repeated dose oral toxicity studies did not result in any mortality or morbidity throughout the experimental period; none of the animal groups used in the study showed any abnormal clinical signs, establishing a "No Observed Adverse Effect Level" of Algae Protein Powder at 3000 mg kg bw-1. Moreover, the test item exhibited a positive impact on growth in test animals. Computational studies established extremely low allergenic potential of the test item.
目前的趋势是,消费者正在寻求营养丰富、高质量的可持续蛋白质来源,以满足他们的营养需求,从而建立了一个明确的意图,以扩大他们的蛋白质视野。微藻蛋白有望成为下一个纯素蛋白的选择。在本研究中,通过一系列体内和体外试验,对从微藻Picochlorum maculatum中提取的蛋白质进行了全面的安全性评估,以供人类食用。细菌反突变试验表明该试验物质不具有诱变性,体外染色体畸变试验和哺乳动物体内微核试验研究表明该试验项目不具有致裂性,因此不具有遗传毒性。根据急性口服毒性研究的结果,该测试项目可根据全球统一的化学品分类系统归类为“第5类”。此外,28天和90天的重复剂量口服毒性研究在整个实验期间没有导致任何死亡率或发病率;本研究使用的动物组均未出现任何异常临床症状,建立了3000 mg kg bw-1的藻类蛋白粉“未观察到不良反应水平”。此外,测试项目对实验动物的生长表现出积极的影响。计算研究证实该测试项目极低的致敏潜力。
{"title":"A Comprehensive Safety Assessment of Algae Protein from Picochlorum for Human Consumption.","authors":"Tomal Dattaroy, Manish R Shukla","doi":"10.1016/j.yrtph.2024.105753","DOIUrl":"https://doi.org/10.1016/j.yrtph.2024.105753","url":null,"abstract":"<p><p>The current trend happens to be that consumers are seeking nourishing, high quality sustainable protein sources to meet their nutritional needs, thus establishing a clear intent to broaden their protein horizon. Microalgae protein holds great promise in becoming the next vegan protein option. In the present study, protein extracted from the microalga Picochlorum maculatum has been thoroughly evaluated for its safety for human consumption through a battery of in-vivo and in-vitro tests. Bacterial reverse mutation assay indicates that the test substance is non-mutagenic and studies comprising of in-vitro chromosomal aberration test and the in-vivo mammalian micronucleus test showed that the test item is non-clastogenic, and therefore, lacks genotoxicity. Based the results of an acute oral toxicity study, the test item can be classified as \"Category 5\" as designated in a globally harmonized system for classification of chemicals. Further, 28-day and 90-day repeated dose oral toxicity studies did not result in any mortality or morbidity throughout the experimental period; none of the animal groups used in the study showed any abnormal clinical signs, establishing a \"No Observed Adverse Effect Level\" of Algae Protein Powder at 3000 mg kg bw<sup>-1</sup>. Moreover, the test item exhibited a positive impact on growth in test animals. Computational studies established extremely low allergenic potential of the test item.</p>","PeriodicalId":20852,"journal":{"name":"Regulatory Toxicology and Pharmacology","volume":" ","pages":"105753"},"PeriodicalIF":3.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142771745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-22DOI: 10.1016/j.yrtph.2024.105745
Yi Yu Rice , David G. Dolan , Suren B. Bandara , Ryan E. Morgan , Michael Garry , Joyce Tsuji
Intravitreal (IVT) injection is an uncommon route of parenteral administration for therapeutic medications, but one of the most important for the treatment of ocular diseases, especially those related to macular degeneration. Nonetheless, there are currently no regulatory guidelines that specifically address how to establish a permitted daily exposure (PDE) for impurities and residual process reagents in IVT pharmaceutical drug products given the unique vulnerability of ocular tissues. The establishment of PDEs for IVT administration is complicated by the limited understanding of metabolism and clearance of small molecular weight chemicals from the human vitreous humor (VH), a problem compounded by the limited IVT-specific toxicological data. In this paper, we describe a feasible and comprehensive methodology for deriving PDE limits for impurities and residual process reagents from IVT drug products, as exemplified by five case studies, including inorganic elements, formic acid, polyethylene glycols, acetic acid, and caprolactam. The five case studies were selected to cover compounds with a wide range of impurity sources and toxicological data availability. The proposed framework considers both local ocular and systemic toxicity endpoints and advances the goal of a harmonized, science-based approach for deriving IVT PDE limits.
{"title":"Considerations and derivations of permitted daily exposure limits for impurities from intravitreal pharmaceutical products","authors":"Yi Yu Rice , David G. Dolan , Suren B. Bandara , Ryan E. Morgan , Michael Garry , Joyce Tsuji","doi":"10.1016/j.yrtph.2024.105745","DOIUrl":"10.1016/j.yrtph.2024.105745","url":null,"abstract":"<div><div>Intravitreal (IVT) injection is an uncommon route of parenteral administration for therapeutic medications, but one of the most important for the treatment of ocular diseases, especially those related to macular degeneration. Nonetheless, there are currently no regulatory guidelines that specifically address how to establish a permitted daily exposure (PDE) for impurities and residual process reagents in IVT pharmaceutical drug products given the unique vulnerability of ocular tissues. The establishment of PDEs for IVT administration is complicated by the limited understanding of metabolism and clearance of small molecular weight chemicals from the human vitreous humor (VH), a problem compounded by the limited IVT-specific toxicological data. In this paper, we describe a feasible and comprehensive methodology for deriving PDE limits for impurities and residual process reagents from IVT drug products, as exemplified by five case studies, including inorganic elements, formic acid, polyethylene glycols, acetic acid, and caprolactam. The five case studies were selected to cover compounds with a wide range of impurity sources and toxicological data availability. The proposed framework considers both local ocular and systemic toxicity endpoints and advances the goal of a harmonized, science-based approach for deriving IVT PDE limits.</div></div>","PeriodicalId":20852,"journal":{"name":"Regulatory Toxicology and Pharmacology","volume":"155 ","pages":"Article 105745"},"PeriodicalIF":3.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142710197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-22DOI: 10.1016/j.yrtph.2024.105743
Tae-Won Kim , Chris N. Papagiannis , Laura S. Zwick , Paul Snyder , Jeffery A. Engelhardt , Rosie Z. Yu , Christine M. Hoffmaster , Archit Rastogi , Scott P. Henry
Inotersen, a 2′-O-(2-methoxyethyl) modified antisense oligonucleotide (2′-MOE ASO), is approved for the treatment of hereditary transthyretin-mediated amyloidosis (hATTR). It underwent a comprehensive nonclinical safety evaluation, including safety pharmacology, repeat-dose toxicity, genotoxicity, reproductive and development toxicity, and carcinogenicity studies. Tumorigenic potential was assessed through dedicated carcinogenicity studies in transgenic rasH2 (Tg.rasH2) mice and Sprague Dawley (SD) rats. In the 26-week Tg.rasH2 mouse study, inotersen and a mouse-active surrogate (ISIS 401724) were administered as weekly subcutaneous (SC) doses up to 80 mg/kg and 30 mg/kg, respectively. Proinflammatory effects and ASO accumulation in the liver and kidney, both well-documented class effects, were observed; however, no treatment-related neoplasms were noted. Similarly, the mouse surrogate did not induce any treatment-related neoplasms. In the 2-year SD rat carcinogenicity study, inotersen was administered as weekly SC doses up to 6 mg/kg. The primary dose-limiting effect at doses ≥2 mg/kg/week was an increased incidence of chronic progressive nephropathy (CPN), which contributed to decreased survival at the 6 mg/kg/week dose level. Notably, no renal neoplasia was associated with the increased CPN. Increasing mononuclear cell infiltrates at the injection site were linked to an increased incidence of subcutaneous fibrosarcoma at doses ≥2 mg/kg/week. This inflammation-associated injection site tumor in rats administered inotersen has limited relevance for humans. Additionally, the long-term assessment of ASO effects in rats is somewhat limited due to the ASO exacerbation of CPN and its impact on survival. There was no evidence of genotoxicity in vitro or in vivo at limit doses. Collectively, these data support a conclusion that a single carcinogenicity assessment in the Tg.rasH2 mouse, along with data from chronic toxicology studies in the rodent and nonrodent, is sufficient to assess carcinogenic potential for this drug class.
{"title":"Carcinogenicity assessment of inotersen in Tg.rasH2 mice and Sprague-Dawley rats: Implications for 2′-MOE antisense oligonucleotides","authors":"Tae-Won Kim , Chris N. Papagiannis , Laura S. Zwick , Paul Snyder , Jeffery A. Engelhardt , Rosie Z. Yu , Christine M. Hoffmaster , Archit Rastogi , Scott P. Henry","doi":"10.1016/j.yrtph.2024.105743","DOIUrl":"10.1016/j.yrtph.2024.105743","url":null,"abstract":"<div><div>Inotersen, a 2′-<em>O</em>-(2-methoxyethyl) modified antisense oligonucleotide (2′-MOE ASO), is approved for the treatment of hereditary transthyretin-mediated amyloidosis (hATTR). It underwent a comprehensive nonclinical safety evaluation, including safety pharmacology, repeat-dose toxicity, genotoxicity, reproductive and development toxicity, and carcinogenicity studies. Tumorigenic potential was assessed through dedicated carcinogenicity studies in transgenic rasH2 (Tg.rasH2) mice and Sprague Dawley (SD) rats. In the 26-week Tg.rasH2 mouse study, inotersen and a mouse-active surrogate (ISIS 401724) were administered as weekly subcutaneous (SC) doses up to 80 mg/kg and 30 mg/kg, respectively. Proinflammatory effects and ASO accumulation in the liver and kidney, both well-documented class effects, were observed; however, no treatment-related neoplasms were noted. Similarly, the mouse surrogate did not induce any treatment-related neoplasms. In the 2-year SD rat carcinogenicity study, inotersen was administered as weekly SC doses up to 6 mg/kg. The primary dose-limiting effect at doses ≥2 mg/kg/week was an increased incidence of chronic progressive nephropathy (CPN), which contributed to decreased survival at the 6 mg/kg/week dose level. Notably, no renal neoplasia was associated with the increased CPN. Increasing mononuclear cell infiltrates at the injection site were linked to an increased incidence of subcutaneous fibrosarcoma at doses ≥2 mg/kg/week. This inflammation-associated injection site tumor in rats administered inotersen has limited relevance for humans. Additionally, the long-term assessment of ASO effects in rats is somewhat limited due to the ASO exacerbation of CPN and its impact on survival. There was no evidence of genotoxicity <em>in vitro</em> or <em>in vivo</em> at limit doses. Collectively, these data support a conclusion that a single carcinogenicity assessment in the Tg.rasH2 mouse, along with data from chronic toxicology studies in the rodent and nonrodent, is sufficient to assess carcinogenic potential for this drug class.</div></div>","PeriodicalId":20852,"journal":{"name":"Regulatory Toxicology and Pharmacology","volume":"155 ","pages":"Article 105743"},"PeriodicalIF":3.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142695428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-20DOI: 10.1016/j.yrtph.2024.105742
L. David Wise
Background
This report addresses the reliability of results from rat Embryo-Fetal Developmental Toxicity (EFDT) studies. Recent literature discusses the roles of reproducibility, replicability, and other influences on scientific reliability. Reproducibility is a re-analysis of the original data, while replicability addresses the same question with a separate study of some type. Concordance of rat and rabbit studies has been addressed previously, but replication of single-species EFDT studies was not found in the literature. A modest modification of the rat study is therefore proposed to assess replicability and possibly enhance reliability.
Methods
Regulatory guidelines were consulted and relevant literature was identified through online searches.
Results
Each replicate EFDT (r-EFDT) study in rats would consist of half the mated females of the definitive study. Studies would start at the same or different times in one testing facility. Separate shipments of animals (non-littermates) are required. All other procedures would be protocol-driven. The micro- and macro-environments of the animals would be held as constant as possible. Justification, design options, and interpretation methods are discussed.
Conclusion
Besides adding reliability, other benefits include reduced animal usage, and potentially reduced cost and time to final reports. By reducing the need for repeated studies due to questionable results, this modified study is viewed as a more efficient use of costly resources. The r-EFDT study design could easily be adapted to assess replicability of rabbit EFDT and some general toxicity studies. Future replicate studies are needed to critically evaluate replicability and the overall impact on study reliability.
{"title":"Enhancing reliability of embryo-fetal developmental toxicity studies: A proposed design of replicate studies","authors":"L. David Wise","doi":"10.1016/j.yrtph.2024.105742","DOIUrl":"10.1016/j.yrtph.2024.105742","url":null,"abstract":"<div><h3>Background</h3><div>This report addresses the reliability of results from rat Embryo-Fetal Developmental Toxicity (EFDT) studies. Recent literature discusses the roles of reproducibility, replicability, and other influences on scientific reliability. Reproducibility is a re-analysis of the original data, while replicability addresses the same question with a separate study of some type. Concordance of rat and rabbit studies has been addressed previously, but replication of single-species EFDT studies was not found in the literature. A modest modification of the rat study is therefore proposed to assess replicability and possibly enhance reliability.</div></div><div><h3>Methods</h3><div>Regulatory guidelines were consulted and relevant literature was identified through online searches.</div></div><div><h3>Results</h3><div>Each replicate EFDT (r-EFDT) study in rats would consist of half the mated females of the definitive study. Studies would start at the same or different times in one testing facility. Separate shipments of animals (non-littermates) are required. All other procedures would be protocol-driven. The micro- and macro-environments of the animals would be held as constant as possible. Justification, design options, and interpretation methods are discussed.</div></div><div><h3>Conclusion</h3><div>Besides adding reliability, other benefits include reduced animal usage, and potentially reduced cost and time to final reports. By reducing the need for repeated studies due to questionable results, this modified study is viewed as a more efficient use of costly resources. The r-EFDT study design could easily be adapted to assess replicability of rabbit EFDT and some general toxicity studies. Future replicate studies are needed to critically evaluate replicability and the overall impact on study reliability.</div></div>","PeriodicalId":20852,"journal":{"name":"Regulatory Toxicology and Pharmacology","volume":"155 ","pages":"Article 105742"},"PeriodicalIF":3.0,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142693453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.yrtph.2024.105744
B. Boamah , S. Siciliano , N. Hogan , M. Hecker , M. Hanson , P. Campbell , R. Peters , A.N. Al-Dissi , L.P. Weber
Exposure to contaminant mixtures from industrial legacy sites presents unique challenges that require novel approaches such as effects-directed toxicity assessment. This study characterized the target organ toxicity of groundwater from a legacy contaminated pesticide plant in male and female Sprague Dawley rats exposed to low impact (10% v/v) groundwater, high impact (0.01% v/v, 0.1% v/v, 1% v/v, and 10% v/v) groundwater or tap water (control) for 60 days. Rats exposed to high impact (1% and 10%) and 10% low impact groundwater mixture showed statistically significant increases in liver necro-inflammation relative to control. A statistically significant reduction was observed in plasma albumin of exposed rats (except 0.01% high impact) and alpha 2 macroglobulin (all exposed) when compared to the control. All groundwater-exposed rats showed glomerulopathy, but there were sex-specific differences in acute tubular necrosis. Testes showed germinal cell vacuolation, necrosis, reduced seminiferous epithelial height, and Sertoli syndrome in exposed rats, accompanied by reduced plasma testosterone and increased testicular malondialdehyde. Taken together, this sub-chronic oral exposure to groundwater from a contaminated industrial site caused dose-dependent hepatic and testicular toxicity, while nephrotoxicity was both sex-dependent and dose-dependent. This study provides support for the essentiality of using effects-driven approaches in the risk assessment of complex mixtures.
{"title":"Target organ toxicity in Sprague Dawley rats following oral exposure to complex groundwater mixture: Assessment of dose-response relationships using histopathological and biochemical alterations","authors":"B. Boamah , S. Siciliano , N. Hogan , M. Hecker , M. Hanson , P. Campbell , R. Peters , A.N. Al-Dissi , L.P. Weber","doi":"10.1016/j.yrtph.2024.105744","DOIUrl":"10.1016/j.yrtph.2024.105744","url":null,"abstract":"<div><div>Exposure to contaminant mixtures from industrial legacy sites presents unique challenges that require novel approaches such as effects-directed toxicity assessment. This study characterized the target organ toxicity of groundwater from a legacy contaminated pesticide plant in male and female Sprague Dawley rats exposed to low impact (10% v/v) groundwater, high impact (0.01% v/v, 0.1% v/v, 1% v/v, and 10% v/v) groundwater or tap water (control) for 60 days. Rats exposed to high impact (1% and 10%) and 10% low impact groundwater mixture showed statistically significant increases in liver necro-inflammation relative to control. A statistically significant reduction was observed in plasma albumin of exposed rats (except 0.01% high impact) and alpha 2 macroglobulin (all exposed) when compared to the control. All groundwater-exposed rats showed glomerulopathy, but there were sex-specific differences in acute tubular necrosis. Testes showed germinal cell vacuolation, necrosis, reduced seminiferous epithelial height, and Sertoli syndrome in exposed rats, accompanied by reduced plasma testosterone and increased testicular malondialdehyde. Taken together, this sub-chronic oral exposure to groundwater from a contaminated industrial site caused dose-dependent hepatic and testicular toxicity, while nephrotoxicity was both sex-dependent and dose-dependent. This study provides support for the essentiality of using effects-driven approaches in the risk assessment of complex mixtures.</div></div>","PeriodicalId":20852,"journal":{"name":"Regulatory Toxicology and Pharmacology","volume":"154 ","pages":"Article 105744"},"PeriodicalIF":3.0,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142688462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pharmaceutical and personal care products, including syrups and toothpastes, extensively use glycerin, sorbitol, and propylene glycol. However, past incidents of ethylene glycol (EG) and diethylene glycol (DEG) contamination in these products have raised serious health concerns. Recently, several child deaths linked to contaminated cough syrup consumption have heightened concerns regarding the safety of Indian pharmaceuticals. In response, Indian drug regulatory authorities and the Indian Pharmacopoeia have implemented several measures to enhance the quality, safety, and efficacy of pharmaceuticals manufactured in India. These measures encompass risk-based inspections of manufacturing facilities, rigorous quality control checks of medicinal products intended for export, and increased transparency in the supply chain of excipients prone to EG and DEG contamination. Further, the Indian Pharmacopoeia has updated monographs for five high-risk excipients: glycerin, propylene glycol, sorbitol solution (70%, both crystallizing and non-crystallizing), and liquid maltitol. These efforts are consistent with global regulatory standards and aim to ensure the overall quality and safety of pharmaceuticals produced in India.
{"title":"Minimizing the risk of ethylene glycol and diethylene glycol poisoning in medications: A regulatory and pharmacopoeial response","authors":"Pawan Kumar, Shruti Rastogi, Pawan Kumar Saini, Saurabh Sahoo, Rajeev Singh Raghuvanshi, Gaurav Pratap Singh Jadaun","doi":"10.1016/j.yrtph.2024.105741","DOIUrl":"10.1016/j.yrtph.2024.105741","url":null,"abstract":"<div><div>Pharmaceutical and personal care products, including syrups and toothpastes, extensively use glycerin, sorbitol, and propylene glycol. However, past incidents of ethylene glycol (EG) and diethylene glycol (DEG) contamination in these products have raised serious health concerns. Recently, several child deaths linked to contaminated cough syrup consumption have heightened concerns regarding the safety of Indian pharmaceuticals. In response, Indian drug regulatory authorities and the Indian Pharmacopoeia have implemented several measures to enhance the quality, safety, and efficacy of pharmaceuticals manufactured in India. These measures encompass risk-based inspections of manufacturing facilities, rigorous quality control checks of medicinal products intended for export, and increased transparency in the supply chain of excipients prone to EG and DEG contamination. Further, the Indian Pharmacopoeia has updated monographs for five high-risk excipients: glycerin, propylene glycol, sorbitol solution (70%, both crystallizing and non-crystallizing), and liquid maltitol. These efforts are consistent with global regulatory standards and aim to ensure the overall quality and safety of pharmaceuticals produced in India.</div></div>","PeriodicalId":20852,"journal":{"name":"Regulatory Toxicology and Pharmacology","volume":"155 ","pages":"Article 105741"},"PeriodicalIF":3.0,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142682610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-16DOI: 10.1016/j.yrtph.2024.105740
Adriana Oller , João Barroso , Pilar Prieto , Violaine Verougstraete , Katherine Heim , Rayetta Henderson
{"title":"Response to Letter to Editors submitted by PE Rasmussen, P Huntsman, TM Singer, MN Jacobs, and CC Trevithick-Sutton (Aug 2024)","authors":"Adriana Oller , João Barroso , Pilar Prieto , Violaine Verougstraete , Katherine Heim , Rayetta Henderson","doi":"10.1016/j.yrtph.2024.105740","DOIUrl":"10.1016/j.yrtph.2024.105740","url":null,"abstract":"","PeriodicalId":20852,"journal":{"name":"Regulatory Toxicology and Pharmacology","volume":"154 ","pages":"Article 105740"},"PeriodicalIF":3.0,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142669060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}