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Domingo-Echaburu S, Hernandez-Palacios R, Orive G, Lertxundi U. A proposal to reduce the amount of permethrin entering wastewater resultant from topical use to treat scabies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 925:171787. [PMID: 38499100 DOI: 10.1016/j.scitotenv.2024.171787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 03/13/2024] [Accepted: 03/15/2024] [Indexed: 03/20/2024]
Abstract
The incidence of scabies is rising in the last years. Subsequently, the use of pharmaceuticals to treat the disease has also increased. Treatment with topical permethrin is usually recommended as a first line agent. This substance is also an aquatic contaminant that is toxic for many non-target organisms, and has been included as a priority substance in the recently published proposal of the European Water Framework Directive. Current guidelines neglect the potential environmental impact of this drug, recommending that the cream should be applied head to toe and "washed off after 8-12 h". Recently, a wiping procedure before hand washing after application of the topical treatment resulted in a 66 % reduction of the amount of diclofenac released in wastewater. The authors suggested that this method could be explored for other topical treatments. In the case of scabiosis, a protocol implicating the whole body needs to be designed. The absorption of topical permethrin is low. Considering the growing incidence of scabies, the amount of the pyrethroid reaching the environment may also be increasing. Therefore, we believe that applying the wiping procedure to the case of topical permethrin deserves consideration. Other measures to minimize the amount of permethrin residues reaching wastewater by washing clothes and bed linen such as wearing single-use pijamas should also be explored. In conclusion, we need to apply a One Health approach in the treatment with scabies, without neglecting the environmental impact of pharmaceuticals. It is not rational to forget drugs once they go down the drain.
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Affiliation(s)
- Saioa Domingo-Echaburu
- Osakidetza Basque Health Service, Debagoiena Integrated Health Organisation, Pharmacy Service, Nafarroa Hiribidea 16, 20500 Arrasate, Gipuzkoa, Spain
| | - Rafael Hernandez-Palacios
- Internal Medicine Service, Araba Psychiatric Hospital, Araba Mental Health Network, Vitoria-Gasteiz, Spain
| | - Gorka Orive
- NanoBioCel Group, Laboratory of Pharmaceutics, School of Pharmacy, University of the Basque Country UPV/EHU, Paseo de la Universidad 7, Vitoria-Gasteiz 01006, Spain; Biomedical Research Networking Centre in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Vitoria-Gasteiz, Spain; University Institute for Regenerative Medicine and Oral Implantology - UIRMI (UPV/EHU-Fundación Eduardo Anitua), Vitoria, Spain; Bioaraba, NanoBioCel Research Group, Vitoria-Gasteiz, Spain
| | - Unax Lertxundi
- Bioaraba Health Research Institute, Osakidetza Basque Health Service, Araba Mental Health Network, Araba Psychiatric Hospital, Pharmacy Service, c/Alava 43, 01006 Vitoria-Gasteiz, Alava, Spain.
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2
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Nguyen QBD, Vu MAN, Hebert AA. Insect repellents: An updated review for the clinician. J Am Acad Dermatol 2023; 88:123-130. [PMID: 30395919 DOI: 10.1016/j.jaad.2018.10.053] [Citation(s) in RCA: 24] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Revised: 10/24/2018] [Accepted: 10/30/2018] [Indexed: 11/25/2022]
Abstract
Malaria, Zika virus, West Nile virus, Dengue fever, and Lyme disease are common causes of morbidity and mortality around the world. While arthropod bites may cause local inflammation and discomfort, a greater concern is the potential to develop deadly systemic infection. The use of insect repellents (IRs) to prevent systemic infections constitutes a fundamental public health effort. Cost effectiveness, availability, and high efficacy against arthropod vectors are key characteristics of an ideal IR. Currently, numerous IRs are available on the market, with N,N-diethyl-3-methylbenzamide (DEET) being the most widely used. DEET has an excellent safety profile and remarkable protection against mosquitoes and various other arthropods. Other Environmental Protection Agency-registered IR ingredients (eg, permethrin, picaridin, IR3535, oil of lemon eucalyptus, oil of citronella, catnip oil, and 2-undecanone) are alternative IRs of great interest because some of these ingredients have efficacies comparable to that of DEET. These alternative IRs possess low toxicity and favorable customer experiences in use (eg, cosmetically pleasant, naturally occurring). This review summarizes the currently available Environmental Protection Agency-registered IRs, including their origins, mechanisms of action, side effect profiles, and available formulations. This review will enable the clinician to select the best IR option to meet a patient's needs and provide the greatest protection from arthropod bites and their sequelae.
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Affiliation(s)
- Quoc-Bao D Nguyen
- Department of Dermatology, UTHealth McGovern Medical School at Houston, Houston, Texas
| | - Mai-Anh N Vu
- University of Texas Medical Branch School of Medicine, Galveston, Texas
| | - Adelaide A Hebert
- Department of Dermatology, UTHealth McGovern Medical School at Houston, Houston, Texas.
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Lehmler HJ, Simonsen D, Garcia AQ, Irfan NM, Dean L, Wang H, von Elsterman M, Li X. A systematic review of human biomonitoring studies of 3-phenoxybenzoic acid, a urinary biomarker pyrethroid insecticide exposure, 1997 to 2019. HYGIENE AND ENVIRONMENTAL HEALTH ADVANCES 2022; 4:100018. [PMID: 36644572 PMCID: PMC9838198 DOI: 10.1016/j.heha.2022.100018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Pyrethroid insecticides are used, for example, in agriculture, indoor environments, and mosquito control programs, resulting in human exposure. Urinary 3-phenoxybenzoic acid (3-PBA) is a nonspecific biomarker for exposure to many pyrethroids. This systematic review identified human biomonitoring studies with 3-PBA that characterize environmental pyrethroid exposures in children and adolescents, pregnant women, and adults or occupational pyrethroid exposures relative to the National Health and Nutrition Examination Survey (NHANES) populations in the United States (US). PubMed, Embase, and SciFinder were searched for "3-phenoxybenzoic acid ", CAS No. 3739-38-6, and urine or urinary or urine level. Duplicate studies and studies meeting the exclusion criteria were removed from the search results based on predetermined exclusion criteria. This screening process identified 57 papers. Twenty-one, thirteen, twenty-two, and eleven manuscripts reported urinary 3-PBA levels in children, pregnant women, environmentally exposed adults, and occupationally exposed adults, respectively. Median 3-PBA levels ranged from 0.2 to 4.7 μg/g creatinine in children (1999-2016), 0.23-1.55 μg/g creatinine in pregnant women (1997-2014), and 0.11-3.34 μg/g creatinine in environmentally exposed adults (1999-2017). 3-PBA levels in occupationally exposed adults were significantly higher than in environmentally exposed populations, ranging from 0.43 to 14 μg/g creatinine (2004-2017). 3-PBA levels in children and adults from the general North American population increased significantly with the sampling year. A decrease in 3-PBA levels was noted in the adult cohorts from PR China and Japan. 3-PBA levels in most studies appeared to be comparable to levels in the NHANES populations; however, some smaller studies had high pyrethroid exposures. Factors contributing to higher 3-PBA levels in the general population included primarily dietary exposures and residential and agricultural pyrethroid applications. These findings demonstrate that pyrethroid exposures are near-ubiquitous worldwide and, in some regions, appear to increase over time. Thus, exposures to pyrethroid insecticides represent a continuing public health concern.
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Affiliation(s)
- Hans-Joachim Lehmler
- Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, IA 52242, USA,Interdisciplinary Graduate Program in Human Toxicology, Graduate College, University of Iowa, Iowa City, IA 52242, USA,Corresponding author: The University of Iowa, Department of Occupational and Environmental Health, University of Iowa Research Park, #221 IREH, Iowa City, IA 52242-5000, USA, (H.-J. Lehmler)
| | - Derek Simonsen
- Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, IA 52242, USA,Interdisciplinary Graduate Program in Human Toxicology, Graduate College, University of Iowa, Iowa City, IA 52242, USA
| | - Alana Quintero Garcia
- Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, IA 52242, USA
| | - Nafis Md Irfan
- Interdisciplinary Graduate Program in Human Toxicology, Graduate College, University of Iowa, Iowa City, IA 52242, USA,Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
| | - Laura Dean
- Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, IA 52242, USA
| | - Hui Wang
- Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, IA 52242, USA
| | | | - Xueshu Li
- Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, IA 52242, USA
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4
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Park SK, Lee HJ, Song E, Jung Y, Yoo HJ, Oh JE, Shin HM, Kwon JH. Filling gaps between exposure modeling and the analysis of urinary biomarkers using personal air monitoring: An intervention study of permethrin used in home insecticide spray. INDOOR AIR 2022; 32:e13090. [PMID: 36040288 DOI: 10.1111/ina.13090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 06/17/2022] [Accepted: 07/23/2022] [Indexed: 06/15/2023]
Abstract
Permethrin is one of the most widely used active ingredients in spray-type home insecticides. However, indoor permethrin exposure resulting from the use of home insecticides is not well-characterized, as measured permethrin concentrations in indoor environmental and biological media with a known application rate are scarce. We conducted an intervention study with four participants for seven days. We conducted personal air monitoring and collected 24-h urine samples in which we quantified time-weighted average (TWA) permethrin concentrations in indoor air (Cair ) and urinary concentrations of two permethrin metabolites, 3-phenoxybenzoic acid (3-PBA) and cis/trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane carboxylic acid (cis/trans-DCCA). We also estimated (1) TWA Cair using a simple indoor air model and (2) urinary excreted (UE) mass using a simple excretion model with both estimated and measured TWA Cair . Measurements of TWA Cair from personal air monitoring were lower than those estimated from the indoor model by a factor of 2.9 to 49.4. The ratio of estimated to measured UE mass ranged 3.5-18.2 when using estimated TWA Cair and 1.1-2.9 when using measured TWA Cair . Smaller ratios in estimating internal permethrin exposure from personal air monitoring suggest that personal air monitoring could reduce uncertainties in permethrin exposure assessment resulting from the use of spray-type insecticides.
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Affiliation(s)
- Seon-Kyung Park
- Division of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
| | - Heon-Jun Lee
- Department of Environmental Engineering, Pusan National University, Busan, Republic of Korea
| | - Eugene Song
- Department of Consumer Science, Chungbuk National University, Chungbuk, Republic of Korea
| | - Yerin Jung
- Division of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
- Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, Texas, USA
| | - Hyun Jung Yoo
- Department of Consumer Science, Chungbuk National University, Chungbuk, Republic of Korea
| | - Jeong-Eun Oh
- Department of Environmental Engineering, Pusan National University, Busan, Republic of Korea
| | - Hyeong-Moo Shin
- Department of Environmental Science, Baylor University, Waco, Texas, USA
- Department of Environmental and Occupational Health, University of California, Irvine, CA, USA
| | - Jung-Hwan Kwon
- Division of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
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5
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Fernando DD, Fischer K. Spinosad topical suspension (0.9%): a new topical treatment for scabies. Expert Rev Anti Infect Ther 2022; 20:1149-1154. [PMID: 35799317 DOI: 10.1080/14787210.2022.2099376] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
INTRODUCTION Scabies is a highly contagious skin disease caused by the parasitic mite Sarcoptes scabiei. There is no vaccine and for the past 30 years, the first line treatments have been topical permethrin and oral ivermectin. These drugs target mainly the parasite nervous system, killing only the motile stages. As they lack ovicidal activities, repeat treatments are required to achieve complete cure. Incompliance to repeat treatments causing prolonged drug usage, has contributed to emerging drug resistances. In addition, they are not appropriate for all patient categories, specifically for infants and young children or pregnant and breast feeding women. Consequently, new single dose scabicides are urgently needed. AREAS COVERED In 2021, spinosad, a drug previously used to treat head lice, was approved by the US FDA as a topical scabies treatment. Here the pharmacology, clinical efficacy and tolerability of this drug are discussed. EXPERT OPINION As the first single dose scabicide the formulated 0.9% topical Spinosad solution shows significant efficacy, little systemic absorption and no serious adverse reactions, making it a promising treatment for classical scabies in patients older than four years.
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Affiliation(s)
- Deepani D Fernando
- Infection and Inflammation Program, QIMR Berghofer Medical Research Institute, 300 Herston Road, Herston, QLD 4006, Australia
| | - Katja Fischer
- Infection and Inflammation Program, QIMR Berghofer Medical Research Institute, 300 Herston Road, Herston, QLD 4006, Australia
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6
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Elser BA, Hing B, Stevens HE. A narrative review of converging evidence addressing developmental toxicity of pyrethroid insecticides. Crit Rev Toxicol 2022; 52:371-388. [PMID: 36345971 PMCID: PMC9930199 DOI: 10.1080/10408444.2022.2122769] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 09/01/2022] [Accepted: 09/05/2022] [Indexed: 11/11/2022]
Abstract
Pyrethroid insecticides are broadly used in agriculture and household products throughout the world. Exposure to this class of insecticides is widespread, and while generally believed to be safe for use, there is increasing concern regarding their effects on neurodevelopment. Due to the critical roles that molecular targets of pyrethroids play in the regulation of neurodevelopment, particular focus has been placed on evaluating the effects of in utero and childhood pyrethroid exposure on child cognition and behavior. As such, this narrative review synthesizes an assessment of converging study types; we review reports of neonatal pyrethroid levels together with current epidemiological literature that convergently address the risk for developmental toxicity linked to exposure to pyrethroid insecticides. We first address studies that assess the degree of direct fetal exposure to pyrethroids in utero through measurements in cord blood, meconium, and amniotic fluid. We then focus on the links between prenatal exposure to these insecticides and child neurodevelopment, fetal growth, and other adverse birth outcomes. Furthermore, we assess the effects of postnatal exposure on child neurodevelopment through a review of the data on pediatric exposures and child cognitive and behavioral outcomes. Study quality was evaluated individually, and the weight of evidence was assessed broadly to characterize these effects. Overall, while definitive conclusions cannot be reached from the currently available literature, the available data suggest that the potential links between pyrethroid exposure and child neurodevelopmental effects deserve further investigation.
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Affiliation(s)
- Benjamin A Elser
- Interdisciplinary Graduate Program in Human Toxicology, Graduate College, The University of Iowa, Iowa City, IA, USA
- Department of Psychiatry, Carver College of Medicine, The University of Iowa, Iowa City, IA, USA
| | - Benjamin Hing
- Department of Psychiatry, Carver College of Medicine, The University of Iowa, Iowa City, IA, USA
- Department of Molecular Physiology and Biophysics, Carver College of Medicine, The University of Iowa, Iowa City, IA, USA
| | - Hanna E Stevens
- Interdisciplinary Graduate Program in Human Toxicology, Graduate College, The University of Iowa, Iowa City, IA, USA
- Department of Psychiatry, Carver College of Medicine, The University of Iowa, Iowa City, IA, USA
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7
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Boyce RM, Muhindo E, Baguma E, Muhindo R, Shem B, François R, Hawke S, Shook-Sa BE, Ntaro M, Nalusaji A, Nyehangane D, Reyes R, Juliano JJ, Siedner MJ, Staedke SG, Mulogo EM. Permethrin-treated baby wraps for the prevention of malaria: results of a randomized controlled pilot study in rural Uganda. Malar J 2022; 21:63. [PMID: 35197060 PMCID: PMC8864600 DOI: 10.1186/s12936-022-04086-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 02/13/2022] [Indexed: 11/10/2022] Open
Abstract
Background Progress against malaria has stalled and may even be slipping backwards in high-burden countries. This is due to a range of factors including insecticide resistance and mosquito feeding behaviours that limit contact with widely-employed interventions including long-lasting insecticidal nets and indoor-residual spraying. Thus, further innovations in malaria control are urgently needed. Methods The pilot was a randomized, placebo-controlled pilot study of permethrin-treated baby wraps—known locally as lesus—in children 6–18 months of age at a single site in rural western Uganda. Fifty mother–infant pairs were assigned to permethrin-treated or untreated lesus in a 1:1 allocation. Participants and clinical staff were blinded to group assignments through use of sham treatment and re-treatment of lesus. Participants attended scheduled clinic visits every 2 weeks for a total 12 weeks. The primary outcome of interest was the safety of the intervention, assessed as changes in the frequency of use, rates of discontinuation, and incidence of adverse events, such as skin rash. Secondary outcomes included acceptability and feasibility of the intervention as measured through participant satisfaction and completion of study activities, respectively. Results Overall, rates of retention and participation were relatively high with 86.0% (43 of 50) of participants completing all scheduled visits, including 18 (75.0%) and 25 (96.2%) in the intervention and control arms respectively. By the conclusion of the 12-week follow-up period, one adverse event (0.35 events per 100 person-weeks, one-sided 95% CI 0.0–1.65) was reported. Satisfaction with the lesu was high in both groups. In each study arm, there were five incident RDT positive results, but the only PCR-positive results were observed in the control group (n = 2). Conclusions Permethrin-treated baby wraps were well-tolerated and broadly acceptable. Adverse events were infrequent and mild. These findings support future trials seeking to determine the efficacy of treated wraps to prevent P. falciparum malaria infection in young children as a complementary tool to existing household-based interventions. Trial registration: ClinicalTrials.gov Identifier: NCT04102592, Registered 25 September 2019. Available at: https://clinicaltrials.gov/ct2/show/NCT04102592 Supplementary Information The online version contains supplementary material available at 10.1186/s12936-022-04086-w.
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Affiliation(s)
- Ross M Boyce
- Institute for Global Health and Infectious Diseases, University of North Carolina at Chapel Hill, 123 West Franklin Street, Suite 230, RM 2151, Chapel Hill, NC, 27599, USA. .,Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
| | - Enid Muhindo
- Department of Community Health, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda
| | - Emmanuel Baguma
- Department of Community Health, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda
| | - Rabbison Muhindo
- Department of Community Health, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda
| | - Bwambale Shem
- Bugoye Level III Health Center, Uganda Ministry of Health, Kasese, Uganda
| | - Ruthly François
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Sam Hawke
- Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Bonnie E Shook-Sa
- Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Moses Ntaro
- Department of Community Health, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda
| | | | - Dan Nyehangane
- Epicentre Mbarara Research Centre, Mbarara, Uganda.,Department of Medical Laboratory Science, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda
| | - Raquel Reyes
- Division of Hospital Medicine, UNC School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Jonathan J Juliano
- Institute for Global Health and Infectious Diseases, University of North Carolina at Chapel Hill, 123 West Franklin Street, Suite 230, RM 2151, Chapel Hill, NC, 27599, USA.,Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Mark J Siedner
- Massachusetts General Hospital and Harvard Medical School, Boston, MA, 02114, USA
| | - Sarah G Staedke
- Department of Clinical Research, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK
| | - Edgar M Mulogo
- Department of Community Health, Faculty of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda
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8
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Park SK, Lee HJ, Song E, Kim Y, Kim DY, Lee JH, Yoo HJ, Oh JE, Kwon JH. Exposure to permethrin used as a home insecticide: A case study comparing model predictions and excretion of metabolites. ENVIRONMENT INTERNATIONAL 2021; 155:106581. [PMID: 33910076 DOI: 10.1016/j.envint.2021.106581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 04/09/2021] [Accepted: 04/12/2021] [Indexed: 06/12/2023]
Abstract
Pyrethroids have been widely used as an active ingredient in home insecticide products since the 1960 s. Although their occurrence in indoor environments has been studied, the contribution of home insecticide application to the aggregate exposure to pyrethroids is not well known. The objective of this study was to estimate the consumer exposure to permethrin, a representative pyrethroid, via the use of home insecticide spray during the summer season using biomonitoring and personal exposure modeling. Exposure to permethrin was assessed by analyzing its urinary metabolites, 3-phenoxybenzoic acid (3-PBA) and cis/trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropan carboxylic acid (cis/trans-DCCA), for a group of consumers (n = 27). The levels of metabolites were also compared with those predicted by a screening exposure model considering personal exposure parameters. The levels of metabolites in 15 participants increased significantly (p < 0.05) with the application of home insecticide products, thereby suggesting that the heavy use of home insecticides during summer could be an important exposure route of permethrin in addition to other sources, such as food consumption. The total amount of excreted 3-PBA and cis/trans-DCCA was lower than the amount estimated by the exposure model for most participants by a factor of 0.9-861.0. These differences could be attributed to the rapid loss of permethrin after application, including sorption to indoor surfaces, reaction with indoor substances, individual biological variations, and ventilation during application. However, the screening exposure model used for the initial safety assessment of biocidal products generally performed well because it did not underestimate the personal exposure to permethrin during the application of home insecticide spray.
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Affiliation(s)
- Seon-Kyung Park
- Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Heon-Jun Lee
- Department of Environmental Engineering, Pusan National University, 63 Busandaehak-ro, Geumjeong-gu, Busan 46241, Republic of Korea
| | - Eugene Song
- Department of Consumer Science, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Chungbuk 28644, Republic of Korea
| | - Yoonsub Kim
- Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Du Yung Kim
- Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jong-Hyeon Lee
- EH R&C, Environmental Research Center, 410 Jeongseojin-ro, Seo-gu, Incheon 22689, Republic of Korea
| | - Hyun Jung Yoo
- Department of Consumer Science, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Chungbuk 28644, Republic of Korea
| | - Jeong-Eun Oh
- Department of Environmental Engineering, Pusan National University, 63 Busandaehak-ro, Geumjeong-gu, Busan 46241, Republic of Korea
| | - Jung-Hwan Kwon
- Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
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9
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Buchholz BA, Ahn KC, Huang H, Gee SJ, Stewart BJ, Ognibene TJ, Hammock BD. Pharmacokinetics, Metabolite Measurement, and Biomarker Identification of Dermal Exposure to Permethrin Using Accelerator Mass Spectrometry. Toxicol Sci 2021; 183:49-59. [PMID: 34460930 PMCID: PMC8404990 DOI: 10.1093/toxsci/kfab082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Impregnating military uniforms and outdoor clothing with the insecticide permethrin is an approach to reduce exposure to insect borne diseases and to repel pests and disease vectors such as mosquitos and sandflies, but the practice exposes wearers to prolonged dermal exposure to the pesticide. Key metabolite(s) from a low dose dermal exposure of permethrin were identified using accelerator mass spectrometry. Metabolite standards were synthesized and a high performance liquide chromatography (HPLC) elution protocol to separate individual metabolites in urine was developed. Six human subjects were exposed dermally on the forearm to 25 mg of permethrin containing 1.0 µCi of 14C for 8 h. Blood, saliva and urine samples were taken for 7d. Absorption/elimination rates and metabolite concentrations varied by individual. Average absorption was 0.2% of the dose. Serum concentrations rose until 12-24 h postdermal application then rapidly declined reaching predose levels by 72 h. Maximum saliva excretion occurred 6 h postdosing. The maximum urinary excretion rate occurred during 12-24 h; average elimination half-life was 56 h. 3-Phenoxybenzyl alcohol glucuronide was the most abundant metabolite identified when analyzing elution fractions, but most of the radioactivity was in still more polar fractions suggesting extensive degradative metabolism and for which there were no standards. Analyses of archived urine samples with the ultra performance liquid chromatography-accelerator mass spectrometry-mass spectrometry (UPLC-AMS-MS) system isolated a distinct polar metabolite but it was much diminished from the previous analyses a decade earlier.
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Affiliation(s)
- Bruce A Buchholz
- Center for Accelerator Mass Spectrometry, Lawrence Livermore National laboratory, Livermore, California 94550, USA
| | - Ki Chang Ahn
- Department of Entomology, University of California, Davis, California, USA
| | - Huazhang Huang
- Department of Entomology, University of California, Davis, California, USA
| | - Shirley J Gee
- Department of Entomology, University of California, Davis, California, USA
| | - Benjamin J Stewart
- Bioscience and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Ted J Ognibene
- Center for Accelerator Mass Spectrometry, Lawrence Livermore National laboratory, Livermore, California 94550, USA
| | - Bruce D Hammock
- Department of Entomology, University of California, Davis, California, USA
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10
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Lobo Y, Wheller L. A narrative review of the roles of topical permethrin and oral ivermectin in the management of infantile scabies. Australas J Dermatol 2021; 62:267-277. [PMID: 34184244 DOI: 10.1111/ajd.13654] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 04/20/2021] [Accepted: 05/29/2021] [Indexed: 11/29/2022]
Abstract
As standard treatments are not licensed for use in the infantile population, the treatment of scabies in this age group can be challenging. We review the relevant evidence to determine the roles of topical permethrin and oral ivermectin in the management of infantile scabies. Demographic and clinical data were collected from relevant English articles published from January 2000 to December 2020. Complete resolution was observed in 100% of infants younger than two months treated with permethrin, and 87.6% of infants aged 12 months or less and/or children weighing under 15 kg treated with ivermectin. Adverse effects from permethrin use were limited to local eczematous reactions. Adverse effects from ivermectin use included mildly elevated creatine kinase levels, eczema flare-ups, diarrhoea, vomiting, irritability, pruritus and pustular skin reactions. Overall, both permethrin and ivermectin appear to have an acceptable safety profile in infants. Permethrin is highly effective as a first-line therapy for scabies in infants younger than two months. Ivermectin use is recommended when authorised topical treatment has failed, in crusted scabies, in cases where compliance with topical agents may be problematic, and in infants with severely inflamed or broken skin where prescription of topical therapies would likely cause cutaneous and systemic toxicity. Additional high-quality studies are needed to guide best practice in the management of infantile scabies.
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Affiliation(s)
- Yolanka Lobo
- Department of Dermatology, Mater Misericordiae Health Services, Brisbane, Queensland, Australia
| | - Laura Wheller
- Department of Dermatology, Mater Misericordiae Health Services, Brisbane, Queensland, Australia.,Department of Dermatology, Queensland Children's Hospital, Brisbane, Queensland, Australia
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Thomas C, Rehmus W, Chang AY. Treatment practices in the management of scabies in infants younger than two months. Pediatr Dermatol 2021; 38:431-435. [PMID: 33486822 DOI: 10.1111/pde.14523] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/23/2020] [Accepted: 01/02/2021] [Indexed: 11/28/2022]
Abstract
BACKGROUND/OBJECTIVES Efficacy and safety data of scabies treatments in infants are limited. Although topical permethrin is used in the treatment of scabies in adults, it is not approved for use in infants younger than 2 months of age in many parts of the world. This study aimed to describe treatment practices in the management of scabies in infants younger than 2 months. METHODS An online survey was developed and distributed to physicians worldwide through the Society of Pediatric Dermatology and the Pediatric Dermatology Research Alliance. Data collected included demographics, medication availability, experience using medications, deterrents to medication use, medication administration preferences, perceived and experienced medication side effects, and preferred treatment agent in this population. RESULTS In total, 57 physicians from seven countries responded. The majority of respondents were board-certified in pediatric dermatology (48/57, 84.2%) and resided in the United States (44/57, 77.2%). Respondents had experience using permethrin (47/57, 82.5%) and precipitated sulfur (35/57, 61.4%) most frequently. Most (38/57, 66.7%) preferred permethrin as their treatment of choice. Among those who did not use permethrin, potential side effects (8/10, 80%) were most frequently reported as a deterrent from its use. However, only 4.3% (22/47) of those who used permethrin reported side effects, including itching, erythema, and xerosis. CONCLUSIONS Permethrin is frequently used in the treatment of infants younger than 2 months with scabies. Furthermore, our results demonstrate that permethrin is the preferred treatment agent among sampled dermatologists for infants younger than 2 months. Few side effects were reported, and none were serious.
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Affiliation(s)
- Cristina Thomas
- Harvard Medicine-Dermatology Combined Residency Training Program, Harvard Medical School, Boston, MA, USA
| | - Wingfield Rehmus
- Division of Dermatology, Department of Pediatrics, University of British Columbia, Vancouver, BC, Canada
| | - Aileen Y Chang
- Department of Dermatology, University of California, San Francisco, CA, USA
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12
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Kühnl J, Tao TP, Brandmair K, Gerlach S, Rings T, Müller-Vieira U, Przibilla J, Genies C, Jaques-Jamin C, Schepky A, Marx U, Hewitt NJ, Maschmeyer I. Characterization of application scenario-dependent pharmacokinetics and pharmacodynamic properties of permethrin and hyperforin in a dynamic skin and liver multi-organ-chip model. Toxicology 2020; 448:152637. [PMID: 33220337 DOI: 10.1016/j.tox.2020.152637] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 11/11/2020] [Accepted: 11/12/2020] [Indexed: 12/12/2022]
Abstract
Microphysiological systems (MPS) aim to mimic the dynamic microenvironment and the interaction between tissues. While MPS exist for investigating pharmaceuticals, the applicability of MPS for cosmetics ingredients is yet to be evaluated. The HUMIMIC Chip2 ("Chip2″), is the first multi-organ chip technology to incorporate skin models, allowing for the topical route to be tested. Therefore, we have used this model to analyze the impact of different exposure scenarios on the pharmacokinetics and pharmacodynamics of two topically exposed chemicals, hyperforin and permethrin. The Chip2 incorporated reconstructed human epidermis models (EpiDerm™) and HepaRG-stellate spheroids. Initial experiments using static incubations of single organoids helped determine the optimal dose. In the Chip2 studies, parent and metabolites were analyzed in the circuit over 5 days after application of single and repeated topical or systemic doses. The gene expression of relevant xenobiotic metabolizing enzymes in liver spheroids was measured to reflect toxicodynamics effects of the compounds in liver. The results show that 1) metabolic capacities of EpiDerm™ and liver spheroids were maintained over five days; 2) EpiDerm™ model barrier function remained intact; 3) repeated application of compounds resulted in higher concentrations of parent chemicals and most metabolites compared to single application; 4) compound-specific gene induction e.g. induction of CYP3A4 by hyperforin depended on the application route and frequency; 5) different routes of application influenced the systemic concentrations of both parents and metabolites in the chip over the course of the experiment; 6) there was excellent intra- and inter-lab reproducibility. For permethrin, a process similar to the excretion in a human in vivo study could be simulated which was remarkably comparable to the in vivo situation. These results support the use of the Chip2 model to provide information on parent and metabolite disposition that may be relevant to risk assessment of topically applied cosmetics ingredients.
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Affiliation(s)
- Jochen Kühnl
- Beiersdorf AG, Unnastraße 48, D-20253, Hamburg, Germany.
| | - Thi Phuong Tao
- TissUse GmbH, Oudenarder Str. 16, D-13347, Berlin, Germany
| | | | - Silke Gerlach
- Beiersdorf AG, Unnastraße 48, D-20253, Hamburg, Germany
| | - Thamée Rings
- Beiersdorf AG, Unnastraße 48, D-20253, Hamburg, Germany
| | | | - Julia Przibilla
- Pharmacelsus GmbH, Science Park 2, D-66123, Saarbrücken, Germany
| | | | | | | | - Uwe Marx
- TissUse GmbH, Oudenarder Str. 16, D-13347, Berlin, Germany
| | - Nicola J Hewitt
- Cosmetics Europe, Avenue Herrmann-Debroux 40, 1160, Auderghem, Belgium
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Comparison of the efficacy of tea tree ( Melaleuca alternifolia) oil with other current pharmacological management in human demodicosis: A Systematic Review. Parasitology 2020; 147:1587-1613. [PMID: 32772960 DOI: 10.1017/s003118202000150x] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Various treatments are found to be moderately effective in managing Demodex-related diseases except tea tree oil (TTO) and terpinen-4-ol (T4O), which showed superior miticidal and anti-inflammatory effects in numerous clinical studies. Their possible effects include lowering mite counts, relieving Demodex-related symptoms, and modulating the immune system. This review summarizes the current clinical topical and oral treatments in human demodicosis, their possible mechanisms of action, side-effects and resistance in treating this condition. TTO (especially T4O) is found to be the most effective followed by metronidazole, ivermectin and permethrin in managing the disease. This is because TTO has anti-parasitic, anti-bacterial, anti-fungal, anti-inflammatory and wound-healing effects. Furthermore, nanoTTO can even release its contents into fungus and Pseudomonas biofilms. Combinations of different treatments are occasionally needed for refractory cases, especially for individuals with underlying genetic predisposal or are immuno-compromised. Although the current treatments show efficacy in controlling the Demodex mite population and the related symptoms, further research needs to be focused on the efficacy and drug delivery technology in order to develop alternative treatments with better side-effects profiles, less toxicity, lower risk of resistance and are more cost-effective.
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Heukelbach J, Wolf D, Clark JM, Dautel H, Roeschmann K. High efficacy of a dimeticone-based pediculicide following a brief application: in vitro assays and randomized controlled investigator-blinded clinical trial. BMC DERMATOLOGY 2019; 19:14. [PMID: 31647007 PMCID: PMC6806501 DOI: 10.1186/s12895-019-0094-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 09/20/2019] [Indexed: 11/25/2022]
Abstract
Background Increasing resistance of head lice against neurotoxic agents and safety concerns have led to the search for treatment alternatives. Dimeticones with a physical mode of action are safe, and bear a reduced risk for the development of resistance. Methods We performed in vitro bioassays to assess pediculicidal and ovicidal activities of a new dimeticone-based product, and a randomized controlled clinical trial to assess efficacy, following 10 min application. Of 153 individuals screened, 100 participants with active head louse infestations were randomly assigned to treatment with either a dimeticone-based test product, or a 0.5% permethrin-based reference product (50 participants per group). Participants received two topical applications of either the test (10 min) or reference products (45 min) at days 0 and 7 or 8. Outcome measures included the efficacies of treatment and their safety, as well as global and local tolerability at baseline, and days 1, 7, and 10. Results After 10 min exposure, all lice treated with the dimeticone test product were classified as non-viable in the in vitro assay. Ovicidal activity after treatment of eggs with the dimeticone test product was 96.8%. In the clinical trial, 96 patients completed all study visits. In the full analysis set (FAS) population, on day 1 after one application, 98% of patients were cured in the test group, as compared to 84% cured in the reference group. All participants in both groups were free of head lice on day 10, following two applications (100% cure rate). In total, 42 adverse events (AEs) in 23 patients of both treatment groups were recorded, with the majority of AEs classified as mild. Conclusions We have shown a high level of pediculicidal and ovicidal activity, and clinical efficacy and safety, of a brief application of a new dimeticone-based product. The short application time and reduced risk for the development of resistance are key drivers for improved patients’ compliance. Trial registration EU Clinical Trials Register EudraCT 2016–004635-20. Registered 14 November 2016.
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Affiliation(s)
- Jorg Heukelbach
- Department of Community Health, School of Medicine, Federal University of Ceará, Rua Professor Costa Mendes 1608, 5. andar, Fortaleza, CE, 60430-140, Brazil.
| | - Doerte Wolf
- CardioSec Clinical Research GmbH, Dalbergsweg 21, 99084, Erfurt, Germany
| | - John Marshall Clark
- Department of Veterinary & Animal Sciences, Massachusetts Pesticide Analysis Lab, University of Massachusetts Amherst, Amherst, MA, 01003, USA
| | - Hans Dautel
- IS Insect Services GmbH, Motzener Straße 6, 12277, Berlin, Germany
| | - Kristina Roeschmann
- G. Pohl-Boskamp GmbH & Co. KG, Kieler Straße 11, 25551, Hohenlockstedt, Germany
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Quindroit P, Beaudouin R, Brochot C. Estimating the cumulative human exposures to pyrethroids by combined multi-route PBPK models: Application to the French population. Toxicol Lett 2019; 312:125-138. [PMID: 31077771 DOI: 10.1016/j.toxlet.2019.05.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Revised: 04/26/2019] [Accepted: 05/07/2019] [Indexed: 01/16/2023]
Abstract
Human biomarkers of exposure to pyrethroid insecticides are usually urinary concentrations of metabolites that can be specific to a pyrethroid or common to several compounds. We developed a global toxicokinetic model that links the external exposure to four widely-used pyrethroids and their isomers (deltamethrin and cis and trans isomers of permethrin, cypermethrin, and cyfluthrin) to the urinary concentrations of metabolites (cis- and trans-DCCA, 3-PBA, F-PBA and DBCA). This global model includes physiologically based pharmacokinetic models for each parent compound and one-compartment models for the metabolites. Existing in vivo, in vitro and in silico data were used for model calibration, and human toxicokinetic data for model evaluation. Overall, the global model reproduced the data accurately as about 90% of predictions were inside the 3-fold error interval. A sensitivity analysis showed that the most influent parameter for each urinary metabolite concentration was the fraction of parent compound that is transformed into that metabolite. The global model was then tested with realistic exposures for the French population: the predictions were consistent with biomonitoring data. The global model is a tool that will improve the interpretation of biomonitoring data for pyrethroids.
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Affiliation(s)
- Paul Quindroit
- Institut National de l'Environnement Industriel et des Risques (INERIS), Unité Modèles pour l'Ecotoxicologie et la Toxicologie (METO), Parc ALATA BP2, 60550, Verneuil en Halatte, France
| | - Rémy Beaudouin
- Institut National de l'Environnement Industriel et des Risques (INERIS), Unité Modèles pour l'Ecotoxicologie et la Toxicologie (METO), Parc ALATA BP2, 60550, Verneuil en Halatte, France
| | - Céline Brochot
- Institut National de l'Environnement Industriel et des Risques (INERIS), Unité Modèles pour l'Ecotoxicologie et la Toxicologie (METO), Parc ALATA BP2, 60550, Verneuil en Halatte, France.
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Côté J, Bouchard M. Dose reconstruction in workers exposed to two major pyrethroid pesticides and determination of biological reference values using a toxicokinetic model. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2018; 28:599-614. [PMID: 29284785 DOI: 10.1038/s41370-017-0004-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 08/30/2017] [Accepted: 09/17/2017] [Indexed: 06/07/2023]
Abstract
A toxicokinetic model has been optimized to describe the time profiles of common biomarkers of exposure to permethrin and cypermethrin: trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane-1-carboxylic acids (trans-DCCA) and 3-phenoxybenzoic acid (3-PBA). The model then served to reproduce urinary time courses in exposed agricultural workers and predict corresponding absorbed doses. It allowed for the prediction of the main routes of exposure in workers during the study period. Modeling showed that simulating exposure mostly by the oral route, during the 3-day biomonitoring period, provided best-fits to the urinary time courses of most workers. This is compatible with an inadvertent oral exposure during work. According to best-fit scenarios, absorbed doses in workers reconstructed with the model reached a maximum of 2.4 µg/kg bw/day and were below the absorbed dose limits associated with an exposure to the reference dose values established by the U.S. Environmental Protection Agency (0.06 and 0.25 mg/kg bw/day for cypermethrin and permethrin, respectively) and the Acceptable Operator Exposure Level set by the European Commission (0.06 mg/kg bw/day for cypermethrin). Modeling was further used to derive biological reference values for cypermethrin and permethrin exposure. Respective values of 7 and 29 nmol/kg bw/day of trans-DCCA, and 3 and 13 nmol/kg bw/day of 3-PBA were obtained. None of the workers presented values above these biological reference values.
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Affiliation(s)
- Jonathan Côté
- Department of Environmental and Occupational Health, Chair in Toxicological Risk Assessment and Management, and University of Montreal Public Health Research Institute (IRSPUM), University of Montreal, Roger-Gaudry Building, U424, Main Station, P.O. Box 6128, Montreal, QB, H3C 3J7, Canada
| | - Michèle Bouchard
- Department of Environmental and Occupational Health, Chair in Toxicological Risk Assessment and Management, and University of Montreal Public Health Research Institute (IRSPUM), University of Montreal, Roger-Gaudry Building, U424, Main Station, P.O. Box 6128, Montreal, QB, H3C 3J7, Canada.
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Role of body composition and physical activity on permethrin urinary biomarker concentrations while wearing treated military uniforms. Toxicol Lett 2018; 299:210-217. [PMID: 30292884 DOI: 10.1016/j.toxlet.2018.10.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 09/25/2018] [Accepted: 10/02/2018] [Indexed: 12/11/2022]
Abstract
Wearing of permethrin treated clothing is becoming more prevalent in military and outdoor occupational and recreational settings, as a personal protection measure against vector borne diseases transmitted through arthropods (e.g., malaria, Lyme disease). The goal of the study was to prospectively examine permethrin exposure among new U.S. Army recruits who had just been issued permethrin-treated uniforms over a 10-week military training period and whether individual body composition (percent body fat, %BF) and physical workload (total energy expenditure, TEE) influenced the exposure. Exposure was assessed by quantification in urine of three permethrin metabolites, 3-phenoxybenzoic acid (3-PBA), and cis- and trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane-1-carboxylic acid. Although there was individual variability, urinary concentrations and estimated dose levels decreased over the 10-week period. Mixed models demonstrated that 10% higher %BF was significantly associated with 4.42% higher 3-PBA concentrations and a 10% higher daily TEE was significantly associated with a 10.57% higher 3-PBA concentrations. Additional factors influencing exposure included sex, number of uniform launderings, and wear- time (hours per previous day).
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18
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Kinetic time courses of lambda-cyhalothrin metabolites after dermal application of Matador EC 120 in volunteers. Toxicol Lett 2018; 296:132-138. [PMID: 30120931 DOI: 10.1016/j.toxlet.2018.08.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 08/09/2018] [Accepted: 08/14/2018] [Indexed: 11/24/2022]
Abstract
A controlled kinetic study was conducted in volunteers dermally exposed to the widely used lambda-cyhalothrin pyrethroid pesticide to document the time courses of relevant biomarkers of exposure, in order to better assess biomonitoring data in workers. Matador® EC120 formulation (120 g/l) was applied on 40 cm2 of the forearm at a 0.25 mg/kg dose of lambda-cyhalothrin and left without occlusion or washing for 6 h. The application site was then washed thoroughly with soap and water. The kinetic time courses of cis-3-(2-chloro-3,3,3-trifluoroprop-1-en-1-yl)-2,2-dimethylcyclopropane carboxylic acid (CFMP) and 3-phenoxybenzoic acid (3-PBA) metabolites were determined in plasma and urine up to 84 h post-application. Results show that the fraction of lambda-cyhalothrin absorbed in the body was rapidly cleared following dermal contact. According to CFMP and 3-PBA plasma profiles, calculated mean apparent absorption half-lives (t1/2) were 3 and 7.3 h, respectively, and corresponding mean apparent elimination t1/2 were 11.2 and 7.6 h. These differences suggest some metabolism at the site-of-entry and storage of metabolites by the dermal route. Toxicokinetic parameters calculated from urinary profiles confirm the values of absorption and elimination rates. Metabolites were almost completely excreted over the 84-h period post-application and, on average, 0.12 and 0.08% of the applied lambda-cyhalothrin dose was recovered in the urine as CFMP and 3-PBA, respectively, indicating a low dermal absorption fraction of this pyrethroid. This study showed the potential use of CFMP and 3-PBA biomarkers for the assessment of dermal exposure to lambda-cyhalothrin pyrethroid.
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Jellali R, Zeller P, Gilard F, Legendre A, Fleury MJ, Jacques S, Tcherkez G, Leclerc E. Effects of DDT and permethrin on rat hepatocytes cultivated in microfluidic biochips: Metabolomics and gene expression study. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2018; 59:1-12. [PMID: 29477483 DOI: 10.1016/j.etap.2018.02.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2017] [Revised: 02/03/2018] [Accepted: 02/09/2018] [Indexed: 06/08/2023]
Abstract
Dichlorodiphenyl-trichloroethane (DDT) and permethrin (PMT) are amongst most prevalent pesticides in the environment. Although their toxicity has been extensively studied, molecular mechanisms and metabolic effects remain unclear, including in liver where their detoxification occurs. Here, we used metabolomics, coupled to RT-qPCR analysis, to examine effects of DDT and PMT on hepatocytes cultivated in biochips. At 150 μM, DDT caused cell death, cytochrome P450 induction and modulation of estrogen metabolism. Metabolomics analysis showed an increase in some lipids and sugars after 6 h, and a decrease in fatty acids (tetradecanoate, octanoate and linoleate) after 24 h exposure. We also found a change in expression associated with genes involved in hepatic estrogen, lipid, and sugar metabolism. PMT at 150 μM perturbed lipid/sugar homeostasis and estrogen signaling pathway, between 2 and 6 h. After 24 h, lipids and sugars were found to decrease, suggesting continuous energy demand to detoxify PMT. Finally, at 15 μM, DDT and PMT appeared to have a small effect on metabolism and were detoxified after 24 h. Our results show a time-dependent perturbation of sugar/lipid homeostasis by DDT and PMT at 150 μM. Furthermore, DDT at high dose led to cell death, inflammatory response and oxidative stress.
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Affiliation(s)
- Rachid Jellali
- Sorbonne Universités, Université de Technologie de Compiègne, CNRS, UMR 7338, Biomécanique et Bioingénierie, Centre de Recherche Royallieu, CS 60319, 60203, Compiègne Cedex, France.
| | - Perrine Zeller
- Sorbonne Universités, Université de Technologie de Compiègne, CNRS, UMR 7338, Biomécanique et Bioingénierie, Centre de Recherche Royallieu, CS 60319, 60203, Compiègne Cedex, France
| | - Françoise Gilard
- Institute of Plant Sciences Paris-Saclay (IPS2), UMR 9213/UMR1403, CNRS, INRA, Université Paris-Sud, Université d'Evry, Université Paris-Diderot, Sorbonne Paris-Cité, Saclay Plant Sciences, Bâtiment 630, 91405, Orsay, France
| | - Audrey Legendre
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PRP-HOM, SRBE, LRTOX, 31 Avenue de la Division Leclerc, BP 17, 92262, Fontenay-aux-Roses Cedex, France
| | - Marie José Fleury
- Sorbonne Universités, Université de Technologie de Compiègne, CNRS, UMR 7338, Biomécanique et Bioingénierie, Centre de Recherche Royallieu, CS 60319, 60203, Compiègne Cedex, France
| | - Sébastien Jacques
- INSERM U1016, Plateforme Génomique, Institut Cochin, 22 Rue Méchain, Paris, 75014, France
| | - Guillaume Tcherkez
- Research School of Biology, ANU College of Science, Australian National University, 2601, Canberra ACT, Australia
| | - Eric Leclerc
- Sorbonne Universités, Université de Technologie de Compiègne, CNRS, UMR 7338, Biomécanique et Bioingénierie, Centre de Recherche Royallieu, CS 60319, 60203, Compiègne Cedex, France; CNRS-LIMMS-UMI 2820, Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro ku, 153-8505, Japan.
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Abstract
Health care providers must be equipped to provide appropriate advice to reproductive-aged patients for protection against the potentially devastating consequences of prenatal Zika virus exposure. The goal of this commentary is to summarize what is known about the safety and toxicity of N,N-diethyl-meta-toluamide (DEET) as a topical insect repellant and the pyrethroid permethrin for treatment of fabric, endorsed in the fight against Zika virus. Reviews assessing the safety and toxicity of DEET conducted by the U.S. Environmental Protection Agency and the Canadian Pest Management Regulatory Agency conclude that DEET has low acute toxicity and does not appear to pose a significant health concern to humans when used as directed. Some experimental animal and limited epidemiologic data suggest that prenatal pyrethroid exposure may adversely affect learning and behavior, but this level of evidence pales in comparison to the known risks of Zika virus to the fetal brain. The available evidence has led to the strong recommendation by the Centers for Disease Control and Prevention for use of these products by pregnant women as personal protection against mosquito bites in the fight against Zika virus infection. This message has been affirmed by our obstetrics and gynecology professional organizations. Because Zika virus is unlikely to be the last disease requiring vector control, those with environmental health expertise must continue to join with infectious disease specialists to communicate the potential vulnerability of our youngest (fetuses, infants, and young children) to vector-borne disease, both to the disease itself and to the strategies employed to mitigate the spread of such disease.
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Affiliation(s)
- Hermann Feldmeier
- Institut für Mikrobiologie und Hygiene, Campus Benjamin Franklin, Charité Universitätsmedizin Berlin, Hindenburgdamm 30, D-12203, Berlin, Deutschland.
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Sunderkötter C, Feldmeier H, Fölster‐Holst R, Geisel B, Klinke‐Rehbein S, Nast A, Philipp S, Sachs B, Stingl J, Stoevesandt J, Hamm H. S1‐Leitlinie zur Diagnostik und Therapie der Skabies – Kurzfassung. J Dtsch Dermatol Ges 2016; 14:1160-1171. [DOI: 10.1111/ddg.13130_g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Cord Sunderkötter
- Abteilung für Translationale Dermatoinfektiologie und Klinik für Hautkrankheiten Münster
| | - Hermann Feldmeier
- Institut für Mikrobiologie und Hygiene Charité – Universitätsmedizin Berlin
| | | | - Bertram Geisel
- Landesgesundheitsamt Baden‐Württemberg im Regierungspräsidium Stuttgart
| | | | - Alexander Nast
- Division of Evidence based Medicine (dEBM), Klinik für Dermatologie, Venerologie und Allergologie Charité – Universitätsmedizin Berlin
| | - Sandra Philipp
- Klinik für Dermatologie, Venerologie und Allergologie Charité – Universitätsmedizin Berlin
| | | | - Julia Stingl
- Bundesinstitut für Arzneimittel und Medizinprodukte Bonn
| | - Johanna Stoevesandt
- Klinik und Poliklinik für Dermatologie, Venerologie und Allergologie Universitätsklinikum Würzburg
| | - Henning Hamm
- Klinik und Poliklinik für Dermatologie, Venerologie und Allergologie Universitätsklinikum Würzburg
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Sunderkötter C, Feldmeier H, Fölster‐Holst R, Geisel B, Klinke‐Rehbein S, Nast A, Philipp S, Sachs B, Stingl J, Stoevesandt J, Hamm H. S1 guidelines on the diagnosis and treatment of scabies – short version. J Dtsch Dermatol Ges 2016; 14:1155-1167. [DOI: 10.1111/ddg.13130] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cord Sunderkötter
- Department of Translational Dermatoinfectiology and Department of Dermatology Münster Germany
| | - Hermann Feldmeier
- Institute of Microbiology and Hygiene Charité – University Medicine Berlin Germany
| | | | - Bertram Geisel
- State Health Department Baden‐Wurttemberg Regional Administrative Authority Stuttgart Germany
| | | | - Alexander Nast
- Division of Evidence based Medicine (dEBM), Department of Dermatology, Venereology and Allergology Charité – University Medicine Berlin Germany
| | - Sandra Philipp
- Department of Dermatology, Venereology and Allergology Charité – University Medicine Berlin Germany
| | | | - Julia Stingl
- The Federal Institute for Drugs and Medical Devices Bonn
| | - Johanna Stoevesandt
- Department of Dermatology, Venereology and Allergology University Hospital Würzburg
| | - Henning Hamm
- Department of Dermatology, Venereology and Allergology University Hospital Würzburg
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Sharma G, Dhankar G, Thakur K, Raza K, Katare OP. Benzyl Benzoate-Loaded Microemulsion for Topical Applications: Enhanced Dermatokinetic Profile and Better Delivery Promises. AAPS PharmSciTech 2016; 17:1221-31. [PMID: 26669889 DOI: 10.1208/s12249-015-0464-0] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Accepted: 12/01/2015] [Indexed: 12/20/2022] Open
Abstract
Benzyl benzoate (BB) is one of the oldest drugs used for the treatment of scabies and is recommended as the "first-line intervention" for the cost-effective treatment of the disease. Though a promising candidate, its application is reported to be associated with irritation of the skin and eye, resulting in poor patient compliance. Hence, the present study aims to develop BB-loaded topical microemulsion for the safer and effective delivery of BB. Pseudo-ternary phase diagrams with BB as the oily phase itself, along with Tween 80 as surfactant, and mixture of phospholipid and ethanol as the co-surfactant along with aqueous solution as the external phase were constructed and various compositions were formulated. The optimized formulation was characterized for particle-size, zeta-potential, drug-content, globule-morphology pH, and refractive-index, whereas evaluated for skin permeation, retention, compliance, and dermatokinetics. The nanosized formulation offered threefold higher drug permeation vis-a-vis plain drug solution across LACA mice abdominal skin. The drug retention of the selected formulation was nearly twice of that from the marketed product, assuring depot formulation and sustained release. The skin histopathology revealed the non-irritant nature of the formulation, as no changes in the normal skin histology were observed. The dermatokinetic studies confirmed better permeation and enhanced skin bioavailability of BB to epidermis as well as dermis vis-à-vis the conventional product. The results indicate that the developed lipid-based microemulsion hydrogel can alleviate the concerns associated with BB and can provide a better and safer delivery option in substantial amounts to various skin layers.
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Raoufinejad K, Mansouri P, Rajabi M, Naraghi Z, Jebraeili R. Efficacy and safety of permethrin 5% topical gel vs. placebo for rosacea: a double-blind randomized controlled clinical trial. J Eur Acad Dermatol Venereol 2016; 30:2105-2117. [PMID: 27600257 DOI: 10.1111/jdv.13801] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 05/02/2016] [Indexed: 11/30/2022]
Abstract
BACKGROUND Rosacea is a chronic, multifactorial, dermatological condition. Increased density of Demodex folliculorum mites in the skin of rosacea patients suggests a possible role for these mites in the pathophysiology of rosacea. OBJECTIVE To evaluate the effects of permethrin 5% topical gel vs. placebo on Demodex density (Dd) and clinical presentations of rosacea patients, and also to further refine the quantitative assessment of Dd in the non-invasive standard skin surface biopsy (SSSB). METHODS Twenty patients with bilateral papulopustular rosacea and ≥5 mites/cm2 were enrolled in the study. Participants and physicians were blinded to the group assignments. Each patient applied permethrin on one side and placebo on the other side of the face twice daily for 12 weeks. SSSB and photography and Rosacea Clinical Scorecard of the National Rosacea Society were used to assess the patients at the baseline, 2nd, 5th, 8th, and 12th weeks for both sides of the face. Causality and severity of adverse drug reactions (ADRs) were assessed by WHO Scale and Hartwig Scale, respectively. RESULTS Dd was not significantly different between the two groups at the baseline. In both groups, Dd significantly decreased after 12 weeks compared to the baseline. At the end of the 12th week, the Dd in the permethrin group was significantly lower than the placebo group. Severity of the clinical presentations decreased in both groups at the end of week 12 in comparison to the baseline, particularly in the permethrin group. ADRs were all mild and in most cases unlikely related to permethrin. CONCLUSION Permethrin 5% gel can significantly reduce the Dd and severity of presentations in rosacea patients and can be a safe and effective option in the management of this chronic disorder. This new SSSB technique offers an easy, quick, inexpensive, and non-invasive sampling method proper for quantitative assessment of Dd.
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Affiliation(s)
- K Raoufinejad
- Department of Clinical Pharmacy, Faculty of Pharmacy, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran, Iran
| | - P Mansouri
- Skin and Stem Cell Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - M Rajabi
- Department of Clinical Pharmacy, Faculty of Pharmacy, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran, Iran
| | - Z Naraghi
- Departments of Dermatology and Pathology, Tehran University of Medical Sciences, Tehran, Iran
| | - R Jebraeili
- Department of Dermatology, Tehran Medical Branch, Islamic Azad University, Tehran, Iran
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26
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Sangaré AK, Doumbo OK, Raoult D. Management and Treatment of Human Lice. BIOMED RESEARCH INTERNATIONAL 2016; 2016:8962685. [PMID: 27529073 PMCID: PMC4978820 DOI: 10.1155/2016/8962685] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 04/17/2016] [Accepted: 06/16/2016] [Indexed: 12/18/2022]
Abstract
Of the three lice (head, body, and pubic louse) that infest humans, the body louse is the species involved in epidemics of louse-borne typhus, trench fever, and relapsing fever, but all the three cause pediculosis. Their infestations occur today in many countries despite great efforts to maintain high standards of public health. In this review, literature searches were performed through PubMed, Medline, Google Scholar, and EBSCOhost, with key search words of "Pediculus humanus", "lice infestation", "pediculosis", and "treatment"; and controlled clinical trials were viewed with great interest. Removing lice by hand or with a lice comb, heating infested clothing, and shaving the scalp were some of the oldest methods of controlling human lice. Despite the introduction of other resources including cresol, naphthalene, sulfur, mercury, vinegar, petroleum, and insecticides, the numbers of lice infestation cases and resistance have increased. To date, viable alternative treatments to replace insecticides have been developed experimentally in vitro. Today, the development of new treatment strategies such as symbiotic treatment and synergistic treatment (antibiotics + ivermectin) in vitro has proved effective and is promising. Here, we present an overview on managing and treating human lice and highlight new strategies to more effectively fight pediculosis and prevent resistance.
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Affiliation(s)
- Abdoul Karim Sangaré
- Research Unit on Emerging Infectious and Tropical Diseases (URMITE), UMR CNRS 7278, IRD 198, INSERM 1095, Faculty of Medicine, Aix-Marseille University, 27 boulevard Jean Moulin, 13005 Marseille, France
- Epidemiology Department of Parasitic Diseases, Faculty of Medicine and Odonto-Stomatology, Faculty of Pharmacy (MRTC/DEAP/FMOS-FAPH) UMI3189, University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
| | - Ogobara K. Doumbo
- Epidemiology Department of Parasitic Diseases, Faculty of Medicine and Odonto-Stomatology, Faculty of Pharmacy (MRTC/DEAP/FMOS-FAPH) UMI3189, University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
| | - Didier Raoult
- Research Unit on Emerging Infectious and Tropical Diseases (URMITE), UMR CNRS 7278, IRD 198, INSERM 1095, Faculty of Medicine, Aix-Marseille University, 27 boulevard Jean Moulin, 13005 Marseille, France
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Hughes MF, Edwards BC. In vivo dermal absorption of pyrethroid pesticides in the rat. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2016; 79:83-91. [PMID: 26817658 DOI: 10.1080/15287394.2015.1109571] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Exposure to pyrethroid pesticides is a potential cause for concern. The objective of this study was to examine the in vivo dermal absorption of bifenthrin, deltamethrin, and permethrin in the rat. Dorsal hair on adult male Long-Evans rats was removed. The next day, the skin was dosed with 1750 nmol (312.5 nmol/cm(2)) of radiolabeled (5 µCi) bifenthrin, deltamethrin, or permethrin in acetone. A nonoccluding plastic cover was glued over the dosing site. The animals were placed in metabolism cages to collect excreta. At 24 h postdosing, the skin was washed with soap and water, and rats in one group were euthanized and their tissues were collected. The skin was removed and tape stripped. The remaining animals were returned to the metabolism cages after the wash for 4 d. These rats were then euthanized and handled as already described. Excreta, wash, tape strips, tissues, and carcass were analyzed for pyrethroid-derived radioactivity. The wash and tape strips removed >50% of the dose and skin retained 9-24%. Cumulative radioactivity in excreta was 0.5-7% at 24 h and 3-26% at 120 h. Radioactivity in tissues was <0.3% of the dose, while carcass retained 2 to 5%. Assuming absorption equals cumulative recovery in skin (washed and tape stripped), excreta, tissues, and carcass, absorption was permethrin ~ bifenthrin > deltamethrin at 24 h and permethrin > deltamethrin > bifenthrin at 120 h. Using the parallelogram approach with published in vitro data, human dermal absorption of these pyrethroids was estimated to be <10% of the dose.
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Affiliation(s)
- Michael F Hughes
- a U.S. Environmental Protection Agency , Research Triangle Park, North Carolina , USA
| | - Brenda C Edwards
- a U.S. Environmental Protection Agency , Research Triangle Park, North Carolina , USA
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Rossbach B, Kegel P, Süß H, Letzel S. Biomonitoring and evaluation of permethrin uptake in forestry workers using permethrin-treated tick-proof pants. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2016; 26:95-103. [PMID: 25967068 DOI: 10.1038/jes.2015.34] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 03/16/2015] [Accepted: 03/24/2015] [Indexed: 06/04/2023]
Abstract
We conducted a randomized case-control trial to analyze uptake of the insecticide/arcaricide permethrin in wearers of permethrin-impregnated and non-impregnated pants in German forestry. Eighty-two male workers were each equipped for a 16-week period with permethrin-treated (test group) or with non-treated work pants (control group). Pants with or without lining to protect against cuts, obtained from two different distributors, were worn in each group. Urinary permethrin metabolite levels were measured by GC-MS/MS before, during and after wearing of the pants. Permethrin uptake was calculated using additional questionnaire data. In the control group, metabolite levels in the range of environmental background exposure (median: ~0.5 μg/l) were measured. Subjects wearing impregnated pants showed consistently significantly higher exposure levels even before the first use of the pants with a maximum after 1 week of wearing the pants (median: ~12.5 μg/l). Significant differences in internal exposure were found depending on which of the distributors the pants came from. Metabolite levels decreased probably due to permethrin losses associated with laundering the pants. Calculated permethrin uptake is below the value corresponding to the WHO-proposed acceptable daily intake. Based on our data, a marginally increased cancer risk compared with the general population cannot be excluded when wearing impregnated pants over a working-lifetime period.
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Affiliation(s)
- Bernd Rossbach
- University Medical Center of the Johannes Gutenberg University Mainz, Institute of Occupational, Social, and Environmental Medicine, Mainz, Germany
| | - Peter Kegel
- University Medical Center of the Johannes Gutenberg University Mainz, Institute of Teachers' Health at the Occupational, Social, and Environmental Medicine, Mainz, Germany
| | - Heike Süß
- University Medical Center of the Johannes Gutenberg University Mainz, Institute of Occupational, Social, and Environmental Medicine, Mainz, Germany
| | - Stephan Letzel
- University Medical Center of the Johannes Gutenberg University Mainz, Institute of Occupational, Social, and Environmental Medicine, Mainz, Germany
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29
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Ferland S, Côté J, Ratelle M, Thuot R, Bouchard M. Detailed Urinary Excretion Time Courses of Biomarkers of Exposure to Permethrin and Estimated Exposure in Workers of a Corn Production Farm in Quebec, Canada. ANNALS OF OCCUPATIONAL HYGIENE 2015; 59:1152-67. [DOI: 10.1093/annhyg/mev059] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Accepted: 07/15/2015] [Indexed: 12/30/2022]
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Ratelle M, Coté J, Bouchard M. Time profiles and toxicokinetic parameters of key biomarkers of exposure to cypermethrin in orally exposed volunteers compared with previously available kinetic data following permethrin exposure. J Appl Toxicol 2015; 35:1586-93. [PMID: 25772368 DOI: 10.1002/jat.3124] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 11/27/2014] [Accepted: 12/22/2014] [Indexed: 11/08/2022]
Abstract
Biomonitoring of pyrethroid exposure is largely conducted but human toxicokinetics has not been fully documented. This is essential for a proper interpretation of biomonitoring data. Time profiles and toxicokinetic parameters of key biomarkers of exposure to cypermethrin in orally exposed volunteers have been documented and compared with previously available kinetic data following permethrin dosing. Six volunteers ingested 0.1 mg kg(-1) bodyweight of cypermethrin acutely. The same volunteers were exposed to permethrin earlier. Blood samples were taken over 72 h after treatment and complete timed urine voids were collected over 84 h postdosing. Cis- and trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane-1-carboxylic acids (trans- and cis-DCCA) and 3-phenoxybenzoic acid (3-PBA) metabolites, common to both cypermethrin and permethrin, were quantified. Blood and urinary time courses of all three metabolites were similar following cypermethrin and permethrin exposure. Plasma levels of metabolites reached peak values on average ≈ 5-7 h post-dosing; the elimination phase showed mean apparent half-lives (t½ ) for trans-DCCA, cis-DCCA and 3-PBA of 5.1, 6.9 and 9.2 h, respectively, following cypermethrin treatment as compared to 7.1, 6.2 and 6.5 h after permethrin dosing. Corresponding mean values obtained from urinary rate time courses were peak values at ≈ 9 h post-dosing and apparent elimination t½ of 6.3, 6.4 and 6.4 h for trans-DCCA, cis-DCCA and 3-PBA, respectively, following cypermethrin treatment as compared to 5.4, 4.5 and 5.7 h after permethrin dosing. These data confirm that the kinetics of cypermethrin is similar to that of permethrin in humans and that their common biomarkers of exposure may be used for an overall assessment of exposure.
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Affiliation(s)
- Mylène Ratelle
- Department of Environmental and Occupational Health, Chair in Toxicological Risk Assessment and Management, and University of Montreal Public Health Research Institute (IRSPUM), University of Montreal, Roger-Gaudry Building, U424, PO Box 6128, Main Station, Montreal, Quebec, Canada, H3C 3J7
| | - Jonathan Coté
- Department of Environmental and Occupational Health, Chair in Toxicological Risk Assessment and Management, and University of Montreal Public Health Research Institute (IRSPUM), University of Montreal, Roger-Gaudry Building, U424, PO Box 6128, Main Station, Montreal, Quebec, Canada, H3C 3J7
| | - Michèle Bouchard
- Department of Environmental and Occupational Health, Chair in Toxicological Risk Assessment and Management, and University of Montreal Public Health Research Institute (IRSPUM), University of Montreal, Roger-Gaudry Building, U424, PO Box 6128, Main Station, Montreal, Quebec, Canada, H3C 3J7
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Ratelle M, Côté J, Bouchard M. Toxicokinetics of permethrin biomarkers of exposure in orally exposed volunteers. Toxicol Lett 2015; 232:369-75. [DOI: 10.1016/j.toxlet.2014.12.003] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 11/27/2014] [Accepted: 12/04/2014] [Indexed: 11/15/2022]
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Xue J, Zartarian V, Tornero-Velez R, Tulve NS. EPA's SHEDS-multimedia model: children's cumulative pyrethroid exposure estimates and evaluation against NHANES biomarker data. ENVIRONMENT INTERNATIONAL 2014; 73:304-11. [PMID: 25192887 DOI: 10.1016/j.envint.2014.08.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Revised: 08/05/2014] [Accepted: 08/12/2014] [Indexed: 05/03/2023]
Abstract
The U.S. EPA's SHEDS-Multimedia model was applied to enhance the understanding of children's exposures and doses to multiple pyrethroid pesticides, including major contributing chemicals and pathways. This paper presents combined dietary and residential exposure estimates and cumulative doses for seven commonly used pyrethroids, and comparisons of model evaluation results with NHANES biomarker data for 3-PBA and DCCA metabolites. Model input distributions were fit to publicly available pesticide usage survey data, NHANES, and other studies, then SHEDS-Multimedia was applied to estimate total pyrethroid exposures and doses for 3-5 year olds for one year variability simulations. For dose estimations we used a pharmacokinetic model and two approaches for simulating dermal absorption. SHEDS-Multimedia predictions compared well to NHANES biomarker data: ratios of 3-PBA observed data to SHEDS-Multimedia modeled results were 0.88, 0.51, 0.54 and 1.02 for mean, median, 95th, and 99th percentiles, respectively; for DCCA, the ratios were 0.82, 0.53, 0.56, and 0.94. Modeled time-averaged cumulative absorbed dose of the seven pyrethroids was 3.1 nmol/day (versus 8.4 nmol/day for adults) in the general population (residential pyrethroid use and non-use homes) and 6.7 nmol/day (versus 10.5 nmol/day for adults) in the simulated residential pyrethroid use population. For the general population, contributions to modeled cumulative dose by chemical were permethrin (60%), cypermethrin (22%), and cyfluthrin (16%); for residential use homes, contributions were cypermethrin (49%), permethrin (29%), and cyfluthrin (17%). The primary exposure route for 3-5 year olds in the simulated residential use population was non-dietary ingestion exposure; whereas for the simulated general population, dietary exposure was the primary exposure route. Below the 95th percentile, the major exposure pathway was dietary for the general population; non-dietary ingestion was the major pathway starting below the 70th percentile for the residential use population. The new dermal absorption methodology considering surface loading had some impact, but did not change the order of key pathways.
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Affiliation(s)
- Jianping Xue
- U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, 109 T.W. Alexander Drive, Research Triangle Park, NC 27709, United States.
| | - Valerie Zartarian
- U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, 109 T.W. Alexander Drive, Research Triangle Park, NC 27709, United States
| | - Rogelio Tornero-Velez
- U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, 109 T.W. Alexander Drive, Research Triangle Park, NC 27709, United States
| | - Nicolle S Tulve
- U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, 109 T.W. Alexander Drive, Research Triangle Park, NC 27709, United States
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Uptake and elimination of permethrin related to the use of permethrin treated clothing for forestry workers. Toxicol Lett 2014; 231:147-53. [DOI: 10.1016/j.toxlet.2014.10.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 10/08/2014] [Accepted: 10/09/2014] [Indexed: 11/22/2022]
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Feldmeier H. Treatment of pediculosis capitis: a critical appraisal of the current literature. Am J Clin Dermatol 2014; 15:401-12. [PMID: 25223568 DOI: 10.1007/s40257-014-0094-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Pediculosis capitis is the most common ectoparasitic disease in children in industrialized countries and extremely common in resource-poor communities of the developing world. The extensive use of pediculicides with a neurotoxic mode of action has led to the development and spread of resistant head lice populations all over the world. This triggered the development of compounds with other modes of action. The current literature on treatment approaches of head lice infestation was searched, and published randomized controlled trials were critically analyzed. The following compounds/family of compounds were identified: spinosad, a novel compound with a new neurotoxic mode of action, isopropyl myristate, 1,2-octanediol, ivermectin, plant-based products, and dimeticones. The efficacy and safety of these compounds are reviewed and recommendations for the treatment of pediculosis capitis in individuals as well as the interruption of ongoing epidemics are provided.
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Affiliation(s)
- Hermann Feldmeier
- Institute of Microbiology and Hygiene, Charité University Medicine, Campus Benjamin Franklin, Hindenburgdamm 27, 12203, Berlin, Germany,
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35
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Côté J, Bonvalot Y, Carrier G, Lapointe C, Fuhr U, Tomalik-Scharte D, Wachall B, Bouchard M. A novel toxicokinetic modeling of cypermethrin and permethrin and their metabolites in humans for dose reconstruction from biomarker data. PLoS One 2014; 9:e88517. [PMID: 24586336 PMCID: PMC3935837 DOI: 10.1371/journal.pone.0088517] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 01/06/2014] [Indexed: 11/18/2022] Open
Abstract
To assess exposure to pyrethroids in the general population, one of most widely used method nowadays consists of measuring urinary metabolites. Unfortunately, interpretation of data is limited by the unspecified relation between dose and levels in biological tissues and excreta. The objective of this study was to develop a common multi-compartment toxicokinetic model to predict the time courses of two mainly used pyrethroid pesticides, permethrin and cypermethrin, and their metabolites (cis-DCCA, trans-DCCA and 3-PBA) in the human body and in accessible biological matrices following different exposure scenarios. Toxicokinetics was described mathematically by systems of differential equations to yield the time courses of these pyrethroids and their metabolites in the different compartments. Unknown transfer rate values between compartments were determined from best fits to available human data on the urinary excretion time courses of metabolites following an oral and dermal exposure to cypermethrin in volunteers. Since values for these coefficients have not yet been determined, a mathematical routine was programmed in MathCad to establish the possible range of values on the basis of physiological and mathematical considerations. The best combination of parameter values was then selected using a statistic measure (reliability factor) along with a statistically acceptable range of values for each parameter. With this approach, simulations provided a close approximation to published time course data. This model allows to predict urinary time courses of trans-DCCA, cis-DCCA and 3-PBA, whatever the exposure route. It can also serve to reconstruct absorbed doses of permethrin or cypermethrin in the population using measured biomarker data.
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Affiliation(s)
- Jonathan Côté
- Département de santé environnementale et santé au travail, Chaire d'analyse et de gestion des risques toxicologiques and Institut de recherche en santé publique de l'Université de Montréal (IRSPUM), Université de Montréal, Montreal, Quebec, Canada
| | - Yvette Bonvalot
- Environmental Health Program, Health Canada, Longueuil, Quebec, Canada
| | - Gaétan Carrier
- Département de santé environnementale et santé au travail, Chaire d'analyse et de gestion des risques toxicologiques and Institut de recherche en santé publique de l'Université de Montréal (IRSPUM), Université de Montréal, Montreal, Quebec, Canada
| | - Caroline Lapointe
- Environmental Health Program, Health Canada, Longueuil, Quebec, Canada
| | - Uwe Fuhr
- Department of Pharmacology, University of Cologne, Clinical Pharmacology Unit, Köln, Germany
| | - Dorota Tomalik-Scharte
- Department of Pharmacology, University of Cologne, Clinical Pharmacology Unit, Köln, Germany
| | - Bertil Wachall
- Infectopharm Arzneimittel und Consilium GmbH, Heppenheim, Germany
| | - Michèle Bouchard
- Département de santé environnementale et santé au travail, Chaire d'analyse et de gestion des risques toxicologiques and Institut de recherche en santé publique de l'Université de Montréal (IRSPUM), Université de Montréal, Montreal, Quebec, Canada
- * E-mail:
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Sugino M, Todo H, Suzuki T, Nakada K, Tsuji K, Tokunaga H, Jinno H, Sugibayashi K. Safety prediction of topically exposed biocides using permeability coefficients and the desquamation rate at the stratum corneum. J Toxicol Sci 2014; 39:475-85. [DOI: 10.2131/jts.39.475] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
| | - Hiroaki Todo
- Faculty of Pharmaceutical Sciences, Josai University
| | | | | | | | - Hiroshi Tokunaga
- Division of Environmental Chemistry, National Institute of Health Sciences
| | - Hideto Jinno
- Division of Environmental Chemistry, National Institute of Health Sciences
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Yoshida T. Biomarkers for monitoring transfluthrin exposure: urinary excretion kinetics of transfluthrin metabolites in rats. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2014; 37:103-109. [PMID: 24560337 DOI: 10.1016/j.etap.2013.11.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 11/08/2013] [Accepted: 11/10/2013] [Indexed: 06/03/2023]
Abstract
The urinary excretion kinetics of a fluorine-containing pyrethroid transfluthrin [(2,3,5,6-tetrafluorophenyl)methyl 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxylate], which is widely used recently as mosquito repellents, was examined in rats to search for urinary metabolites suitable as biomarkers for monitoring transfluthrin exposure of the general population. After a single dose of 26, 64, 160 or 400 mg/kg body weight of transfluthrin had been administered intraperitoneally to male Sprague-Dawley rats, their urine was collected periodically for one week. Three major urinary transfluthrin metabolites were measured: 2,3,5,6-tetrafluorobenzyl alcohol, 2,3,5,6-tetrafluorobenzoic acid and 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid. The kinetics was evaluated by moment analysis of the urinary excretion rate of the metabolites versus time curves. The urinary excretion amounts of these three metabolites were estimated to be proportional to the absorption amounts of transfluthrin over a wide exposure range. Urinary 2,3,5,6-tetrafluorobenzoic acid was considered to be an optimal biomarker for monitoring transfluthrin exposure.
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Affiliation(s)
- Toshiaki Yoshida
- Osaka Prefectural Institute of Public Health, 1-3-69, Nakamichi, Higashinari-ku, Osaka 537-0025, Japan.
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Wei B, Isukapalli SS, Weisel CP. Studying permethrin exposure in flight attendants using a physiologically based pharmacokinetic model. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2013; 23:416-27. [PMID: 23462847 PMCID: PMC4063416 DOI: 10.1038/jes.2013.12] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Assessment of potential health risks to flight attendants from exposure to pyrethroid insecticides, used for aircraft disinsection, is limited because of (a) lack of information on exposures to these insecticides, and (b) lack of tools for linking these exposures to biomarker data. We developed and evaluated a physiologically based pharmacokinetic (PBPK) model to assess the exposure of flight attendants to the pyrethroid insecticide permethrin attributable to aircraft disinsection. The permethrin PBPK model was developed by adapting previous models for pyrethroids, and was parameterized using currently available metabolic parameters for permethrin. The human permethrin model was first evaluated with data from published human studies. Then, it was used to estimate urinary metabolite concentrations of permethrin in flight attendants who worked in aircrafts, which underwent residual and pre-flight spray treatments. The human model was also applied to analyze the toxicokinetics following permethrin exposures attributable to other aircraft disinsection scenarios. Predicted levels of urinary 3-phenoxybenzoic acid (3-PBA), a metabolite of permethrin, following residual disinsection treatment were comparable to the measurements made for flight attendants. Simulations showed that the median contributions of the dermal, oral and inhalation routes to permethrin exposure in flight attendants were 83.5%, 16.1% and 0.4% under residual treatment scenario, respectively, and were 5.3%, 5.0% and 89.7% under pre-flight spray scenario, respectively. The PBPK model provides the capability to simulate the toxicokinetic profiles of permethrin, and can be used in the studies on human exposure to permethrin.
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Affiliation(s)
- Binnian Wei
- Environmental and Occupational Health Sciences Institute, A Joint Institute of Rutgers University and University of Medicine and Dentistry of New Jersey, Piscataway, New Jersey 08854, USA
| | - Sastry S. Isukapalli
- Environmental and Occupational Health Sciences Institute, A Joint Institute of Rutgers University and University of Medicine and Dentistry of New Jersey, Piscataway, New Jersey 08854, USA
| | - Clifford P. Weisel
- Environmental and Occupational Health Sciences Institute, A Joint Institute of Rutgers University and University of Medicine and Dentistry of New Jersey, Piscataway, New Jersey 08854, USA
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Goldust M, Babae Nejad S, Rezaee E, Raghifar R. Comparative trial of permethrin 5% versus lindane 1% for the treatment of scabies. J DERMATOL TREAT 2013:1-3. [PMID: 22905702 DOI: 10.3109/09546634.2012.723122] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Objective: Treatment of scabies is an important issue in infectious dermatology. The aim of this study was to specify whether permethrin is effective for the treatment of human scabies and to compare its effectiveness with that of 1% lindane by topical application. Methods: 220 patients with scabies with the mean age of 44 ± 12/24 attended the study. Patients were divided into two groups randomly. The first group and their family contacts received 5% permethrin cream and the other received 1% lindane lotion. Treatment was evaluated at intervals of 2 and 4 weeks. Results: Of 254 patients, 220 completed the study. 110 in the group treated with lindane and 110 in the group treated with permethrin. Permethrin provided an improvement rate of 92 (83.6%) after 2 weeks, whereas lindane was effective only in 54 (49%) of patients. After 4 weeks improvement rate was 96.3% (106 of 110) in permethrin group since it was only 69.1% (76 of 110) in lindane group. Conclusion: Permethrin (5%) cream was found to be significantly more effective in the treatment of scabies in comparison with lindane in this study. There were no adverse effects with either permethrin or lindane.
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Affiliation(s)
- Mohamad Goldust
- Tabriz University of Medical Sciences, Student Research Committee , Tabriz, Iran , Islamic Republic of Iran
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An Ecofriendly and Stability-Indicating HPLC Method for Determination of Permethrin Isomers: Application to Pharmaceutical Analysis. J CHEM-NY 2013. [DOI: 10.1155/2013/697831] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A green, simple, and stability-indicating RP-HPLC method was developed for simultaneous determination of permethrin isomers in pharmaceutical preparations. The separation was based on a C18analytical column (150 × 4.6 mm, i.d., 5 μm). The mobile phase consisted of ethanol: phosphoric acid solution (pH = 3) (67 : 33, v/v). The elution was carried out at 30°C temperature with a flow rate of 1.0 mL/min. Quantitation was achieved with UV detection at 215 nm. In forced degradation studies, the drug was subjected to oxidation, hydrolysis, photolysis, and heat. The method was validated for specificity, linearity, precision, accuracy, and robustness. The applied procedure was found to be linear in permethrin concentration range of 0.5–50 μg/mL with correlation coefficients of 0.9996 for each isomer. Precision was evaluated by replicate analysis in which % relative standard deviation (RSD) values for areas were found below 2.0. The recoveries obtained (99.24%–100.72%) ensured the accuracy of the developed method. The peaks of permethrin isomers well resolved from various degradation products as well as the pharmaceutical excipients. Accordingly, the proposed validated and sustainable procedure was proved to be proper for routine analyzing and stability studies of permethrin in pharmaceutical preparations.
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Tornero-Velez R, Davis J, Scollon EJ, Starr JM, Setzer RW, Goldsmith MR, Chang DT, Xue J, Zartarian V, DeVito MJ, Hughes MF. A pharmacokinetic model of cis- and trans-permethrin disposition in rats and humans with aggregate exposure application. Toxicol Sci 2012; 130:33-47. [PMID: 22859315 DOI: 10.1093/toxsci/kfs236] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Permethrin is a broad-spectrum pyrethroid insecticide and among the most widely used insecticides in homes and crops. Managing the risks for pesticides such as permethrin depends on the ability to consider diverse exposure scenarios and their relative risks. Physiologically based pharmacokinetic models of delta methrin disposition were modified to describe permethrin kinetics in the rat and human. Unlike formulated deltamethrin which consists of a single stereoisomer, permethrin is formulated as a blend of cis- and trans-diastereomers. We assessed time courses for cis-permethrin and trans-permethrin in several tissues (brain, blood, liver, and fat) in the rat following oral administration of 1 and 10mg/kg permethrin (cis/trans: 40/60). Accurate simulation of permethrin in the rat suggests that a generic model structure is promising for modeling pyrethroids. Human in vitro data and appropriate anatomical information were used to develop a provisional model of permethrin disposition with structures for managing oral, dermal, and inhalation routes of exposure. The human permethrin model was used to evaluate dietary and residential exposures in the U.S. population as estimated by EPA's Stochastic Human Exposure and Dose Simulation model. Simulated cis- and trans-DCCA, metabolites of permethrin, were consistent with measured values in the National Health and Nutrition Examination Survey, indicating that the model holds promise for assessing population exposures and quantifying dose metrics.
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Affiliation(s)
- Rogelio Tornero-Velez
- NERL/ORD, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA.
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Pediculosis capitis: new insights into epidemiology, diagnosis and treatment. Eur J Clin Microbiol Infect Dis 2012; 31:2105-10. [PMID: 22382818 DOI: 10.1007/s10096-012-1575-0] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Accepted: 01/29/2012] [Indexed: 10/28/2022]
Abstract
Pediculosis capitis is a ubiquitous parasitic skin disease caused by Pediculus humanus capitis. Head lice are highly specialised parasites which can propagate only on human scalp and hair. Transmission occurs by direct head-to-head contact. Head lice are vectors of important bacterial pathogens. Pediculosis capitis usually occurs in small epidemics in play groups, kindergartens and schools. Population-based studies in European countries show highly diverging prevalences, ranging from 1% to 20%. The diagnosis of head lice infestation is made through the visual inspection of hair and scalp or dry/wet combing. The optimal method for the diagnosis of active head lice infestation is dry/wet combing. Topical application of a pediculicide is the most common treatment. Compounds with a neurotoxic mode of action are widely used but are becoming less effective due to resistant parasite populations. Besides, their use is restricted by safety concerns. Dimeticones, silicone oils with a low surface tension and the propensity to perfectly coat surfaces, have a purely physical mode of action. This group of compounds is highly effective and safe, and there is no risk that head lice become resistant. The control of epidemics requires active contact tracing and synchronised treatment with an effective and safe pediculicide.
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Wei B, Mohan KR, Weisel CP. Exposure of flight attendants to pyrethroid insecticides on commercial flights: urinary metabolite levels and implications. Int J Hyg Environ Health 2011; 215:465-73. [PMID: 21937269 DOI: 10.1016/j.ijheh.2011.08.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 08/10/2011] [Accepted: 08/22/2011] [Indexed: 10/17/2022]
Abstract
Pyrethroid insecticides have been used for disinsection of commercial aircrafts. However, little is known about the pyrethroids exposure of flight attendants. The objective of the study was to assess pyrethroids exposure of flight attendants working on commercial aircrafts through monitoring the urinary pyrethroids metabolite levels. Eighty four urine samples were collected from 28 flight attendants, 18-65 years of age, with seventeen working on planes that were non-disinsected, and eleven working on planes that had been disinsected. Five urinary metabolites of pyrethroids were measured using gas chromatographic-mass spectrometric method: 3-phenoxybenzoic acid (3-PBA), cis-/trans-3-(2,2-Dichlorovinyl)-2,2-dimethylcyclo-propane carboxylic acid (cis-/trans-Cl2CA), cis-3-(2,2-dibromovinyl)-2,2-dimethylcyclo-propane-1-carboxylic acid (cis-Br2CA) and 4-fluoro-3-phenoxybenzoic acid (4F-3-PBA). Flight attendants working on disinsected planes had significantly higher urinary levels of 3-PBA, cis- and trans-Cl2CA in pre, post- and 24-h-post flight samples than those on planes which did not report having been disinsected. Urinary levels of cis-Br2CA and 4F-3-PBA did not show significant differences between the two groups. Flight attendants working on international flights connected to Australia had higher urinary levels of 3-PBA, cis- and trans-Cl2CA than those on either domestic and other international flights flying among Asia, Europe and North America. Post-disinsection duration (number of days from disinsection date to flight date) was the most significant factor affecting the urinary pyrethroid metabolites levels of 3-PBA, cis- and trans-Cl2CA of the group flying on disinsected aircraft. It was concluded that working on commercial aircraft disinsected by pyrethroids resulted in elevated body burdens of 3-PBA, cis- and trans-Cl2CA.
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Affiliation(s)
- Binnian Wei
- Exposure Science, Graduate School of Biomedical Science, Environmental and Occupational Health Sciences Institute, A Joint Institute of Rutgers University and University of Medicine and Dentistry of New Jersey, Piscataway, NJ 08854, USA
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Bassi A, D'Erme AM, Gola M. Erythema multiforme-like irritant contact dermatitis after application of an antiscabies treatment. Int J Immunopathol Pharmacol 2011; 24:545-7. [PMID: 21658333 DOI: 10.1177/039463201102400232] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
We describe the case of an irritant contact dermatitis due to an antiscabies treatment in a man who presented to our clinic with an important cutaneous reaction with many hemorrhagic, "target" erythema multiforme-like lesions, as the result of an acute toxic insult of the skin by permethrin 5%. This is a possible, but very uncommon symptom of non-eczematous contact dermatitis and an unusual drug causing the acute hypersensitivity reaction typical of erythema multiforme.
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Kaneko H. Pyrethroids: mammalian metabolism and toxicity. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:2786-2791. [PMID: 21133409 DOI: 10.1021/jf102567z] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Synthetic pyrethroids, a major insecticide group, are used worldwide to control agricultural and household pests. Mammalian metabolism of pyrethroids was substantially launched in the 1960s and 1970s by the research groups of Professor Casida and Sumitomo Chemical Co., which made great contributions to the elucidation of their metabolic fates. They showed that ester hydrolysis and oxidation play predominant roles in mammalian metabolism of pyrethroids and that rapid metabolism leads to low mammalian toxicity. These metabolic reactions are mediated by carboxylesterases and CYP isoforms, the resultant metabolites then undergoing various conjugation reactions. In general, there are substantially neither significant species differences in metabolic reactions of pyrethoids nor metabolic differences among their chiral isomers except with fenvalerate, one isomer of which yields a lipophilic conjugate causing toxicity.
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Affiliation(s)
- Hideo Kaneko
- Environmental Health Science Laboratory, Sumitomo Chemical Company Ltd., 1-98-3 Kasugadenaka, Konohana-ku Osaka, Japan.
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46
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Miller NJ, Rainone EE, Dyer MC, González ML, Mather TN. Tick bite protection with permethrin-treated summer-weight clothing. JOURNAL OF MEDICAL ENTOMOLOGY 2011; 48:327-333. [PMID: 21485369 DOI: 10.1603/me10158] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The number of tick bites received by individuals wearing either permethrin-treated or untreated summer clothing (T-shirt, shorts, socks, and sneakers) was compared during a controlled indoor study. Pathogen-free nymphal Ixodes scapularis Say were placed on the left shoe, right leg, and left arm of 15 (5/treatment group/d) human volunteers wearing untreated outfits or outfits treated with permethrin either commercially or using a do-at-home treatment kit. The number and location of ticks attached to subjects' skin were recorded 2.5 h postinfestation. Subjects wearing outfits treated with permethrin received 3.36 times fewer tick bites than subjects wearing untreated outfits. No statistically significant differences in number of tick bites were detected between commercial permethrin treatment (19.33%) and the do-at-home permethrin application method (24.67%). The success of permethrin-treated clothing in reducing tick bites varied depending on the specific article of clothing. Subjects wearing permethrin-treated sneakers and socks were 73.6 times less likely to have a tick bite than subjects wearing untreated footware. Subjects wearing permethrin-treated shorts and T-shirts were 4.74 and 2.17 times, respectively, less likely to receive a tick bite in areas related to those specific garments than subjects wearing untreated shorts and T-shirts. Ticks attached to subjects were classified as alive or dead before removal. On subjects wearing untreated outfits, 97.6% of attached nymphs were alive, whereas significantly fewer (22.6%) attached nymphs were alive on subjects wearing repellent-treated outfits. Results of this study demonstrate the potential of permethrin-treated summer clothing for significantly reducing tick bites and tick-borne pathogen transmission.
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Affiliation(s)
- Nathan J Miller
- Center for Vector-Borne Disease, University of Rhode Island, 9 East Alumni Avenue, Suite 7, Kingston, RI 02881, USA
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Ross JH, Reifenrath WG, Driver JH. Estimation of the percutaneous absorption of permethrin in humans using the parallelogram method. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2011; 74:351-363. [PMID: 21271436 DOI: 10.1080/15287394.2011.534425] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The objective of this study was to develop an estimate of the percent dermal absorption of permethrin in humans to provide more accurate estimates of potential systemically absorbed dose associated with dermal exposure scenarios. Piperonyl butoxide (PBO) was used as a reference compound. The human percutaneous absorption estimate was based on the assumption that the ratio of in vivo dermal absorption (expressed as a percentage during a given time period) of permethrin through rat skin to in vitro dermal absorption through rat skin was the same as the ratio of in vivo dermal absorption in humans to in vitro dermal absorption with human skin, known as the parallelogram method. The ratio of dermal absorption by in vitro rat skin to absorption by in vitro human skin ranged from 6.7 to 15.4 (for a 24-h exposure period) with an average of 11. Data suggest in vivo human dermal absorption values for permethrin ranging from 1.4 to 3.3% when estimated based on 24-h in vivo rat values, and 2.5 to 5.7% based on 5-d in vivo rat values. The parallelogram method used to estimate dermal absorption of permethrin and PBO is supported by results from several other compounds for which in vivo and in vitro rat and human dermal absorption data exist. Collectively, these data indicate that estimating human dermal absorption from in vitro human and rat plus in vivo rat data are typically accurate within ±3-fold of the values measured in human subjects.
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Affiliation(s)
- John H Ross
- risksciences.net, LLC, Carmichael, California 95608, USA.
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48
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Sunderkötter C, Kirchhefer U. [Limited toxicity of the pediculicides pyrethrin, pyrethroids, and permethrin]. Hautarzt 2010; 61:906-9. [PMID: 20835808 DOI: 10.1007/s00105-010-2034-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- C Sunderkötter
- Klinik und Poliklinik für Dermatologie und Venerologie, Universitätsklinikum Münster, Von-Esmarch-Str. 58, 48149, Münster.
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Affiliation(s)
- Bart J Currie
- Menzies School of Health Research, Royal Darwin Hospital, Darwin, NT, Australia.
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50
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Tjioe M, Vissers WHPM. Scabies outbreaks in nursing homes for the elderly: recognition, treatment options and control of reinfestation. Drugs Aging 2008; 25:299-306. [PMID: 18361540 DOI: 10.2165/00002512-200825040-00003] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The scabies mite is an ectoparasite able to infest humans. Its clinical presentation is typical, although in immunocompromised, mentally retarded and elderly patients the clinical presentation may be altered. Diagnosis may therefore be difficult in such patient groups, who often reside in nursing homes. Because delay in diagnosis may induce rapid spread of the scabies mite, immediate diagnosis and treatment are necessary. Normal scabies (scabies vulgaris) and crusted scabies (scabies crustosa, scabies norvegica), although sometimes difficult to diagnose, especially in the elderly, are fortunately quite easy to treat. However, the elderly patient may experience toxicity from local or systemic scabicidal treatment. Single cases of scabies vulgaris should be treated with permethrin cream because of its outstanding efficacy and favourable adverse events profile. Scabies outbreaks and cases of scabies crustosa can easily be managed using combination therapy consisting of topical application of permethrin and two oral doses of ivermectin 200 microg/kg (administered 1 week apart). In addition to treatment of the scabies infestation, preventative measures are necessary, particularly in nursing homes.
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Affiliation(s)
- Milan Tjioe
- Department of Dermatology, Gelre Hospitals, Apeldoorn, the Netherlands.
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