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Li Y, Huang J, Ge C, Zhu S, Wang H, Zhang Y. The effects of prenatal azithromycin exposure on offspring ovarian development at different stages, doses, and courses. Biomed Pharmacother 2024; 172:116246. [PMID: 38359487 DOI: 10.1016/j.biopha.2024.116246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 01/29/2024] [Accepted: 02/01/2024] [Indexed: 02/17/2024] Open
Abstract
Azithromycin, a commonly used macrolide antibiotic for treating chlamydial infections during pregnancy, has sparked investigations into its potential effects on offspring development. Despite these inquiries, there remains uncertainty about the specific impact of prenatal azithromycin exposure (PAzE) on offspring ovarian development and the precise "effect window". Pregnant mice, following clinical guidelines for azithromycin dosing, were orally administered azithromycin at different gestational stages [(gestational day, GD) 10-12 or GD 15-17], doses (50, 100, or 200 mg/kg·d), and courses (single or multiple). On GD 18, we collected offspring blood and ovaries to examine changes in fetal serum estradiol (E2) levels, fetal ovarian morphology, pre-granulosa cell function, and oocyte development. Multiple courses of PAzE resulted in abnormal fetal ovarian morphological development, disorganized germ cell nests, enhanced ovarian cell proliferation, and reduced apoptosis. Simultaneously, multiple courses of PAzE significantly increased fetal serum E2 levels, elevated ovarian steroidogenic function (indicated by Star, 3β-hsd, and Cyp19 expression), disrupted oocyte development (indicated by Figlα and Nobox expression), and led to alterations in the MAPK signal pathway in fetal ovaries, particularly in the high-dose treatment group. In contrast, a single course of PAzE reduced fetal ovarian cell proliferation, decreased steroidogenic function, and inhibited oocyte development, particularly through the downregulation of Mek2 expression in the MAPK signal pathway. These findings suggest that PAzE can influence various aspects of fetal mouse ovarian cell development. Multiple courses enhance pre-granulosa cell estrogen synthesis function and advance germ cell development, while a single terminal gestation dose inhibits germ cell development. These differential effects may be associated with changes in the MAPK signal pathway.
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Affiliation(s)
- Yating Li
- Department of Obstetrics and Gynaecology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Jing Huang
- Department of Otorhinolaryngology Head and Neck Surgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China; Hubei Provincial Key Laboratory of Developmentally Originated Disease, Wuhan 430071, China
| | - Caiyun Ge
- Department of Obstetrics and Gynaecology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China; Hubei Provincial Key Laboratory of Developmentally Originated Disease, Wuhan 430071, China
| | - Sen Zhu
- Department of Pharmacology, Basic Medical School of Wuhan University, Wuhan 430071, China
| | - Hui Wang
- Department of Obstetrics and Gynaecology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China; Department of Pharmacology, Basic Medical School of Wuhan University, Wuhan 430071, China; Hubei Provincial Key Laboratory of Developmentally Originated Disease, Wuhan 430071, China.
| | - Yuanzhen Zhang
- Department of Obstetrics and Gynaecology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China; Hubei Provincial Key Laboratory of Developmentally Originated Disease, Wuhan 430071, China.
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Wei L, Wang T, Luo M, Zhang S, Lu M, Zhou X, Cheng X, Wang H, Xu D. A "toxic window" study on the hippocampal development of mice offspring exposed to azithromycin at different doses, courses, and time during pregnancy. Chem Biol Interact 2024; 387:110814. [PMID: 37995777 DOI: 10.1016/j.cbi.2023.110814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 11/07/2023] [Accepted: 11/15/2023] [Indexed: 11/25/2023]
Abstract
BACKGROUND Azithromycin, one of the new-generation macrolides, is an effective medicine for the treatment of mycoplasma infection during pregnancy. Epidemiological studies have reported adverse pregnancy outcomes with prenatal azithromycin exposure (PAzE). However, the effect of PAzE on fetal hippocampal development is unclear. This study aimed to explore the effects and potential mechanism of PAzE-induced fetal hippocampal development at different doses, courses, and time. METHOD Pregnant mice were administered azithromycin by gavage at different doses (50, 100 or 200 mg/kg.d), different courses (gestational day (GD)15-17 for three consecutive days, or GD17 once a day) and different time (GD10-12, GD15-17). RESULTS Compared with the control group, morphological development damage of the fetal hippocampus was observed in the PAzE group, with a dysbalance in neuronal proliferation and apoptosis, decreased expression of the neuronal-specific marker Snap25, NeuN, PSD95 and Map2, increased expression of the glial-specific marker Iba1, GFAP, and S-100β, and decreased expression of P2ry12. The PAzE-induced hippocampal developmental deficiency varied based on different doses, courses, and time, and the developmental toxicity was most significant in the late pregnancy, high dose, multi-course group (AZHT). The significant reduction of SOX2 and Wnt, which were related to regulation of neural progenitor cells (NPCs) proliferation in PAzE fetus compared with the control group indicated that the SOX2/Wnt signaling may be involved in PAzE-induced hippocampal developmental toxicity. CONCLUSION In this study, PAzE was associated with hippocampal developmental toxicity in a variety of nerve cells. Hippocampal developmental toxicity due to azithromycin was most significant in the late pregnancy, high-dose (equivalent to maximum clinical dose) and multi-course group (AZHT). The findings provide an experimental and theoretical foundation for guiding the sensible use of medications during pregnancy and effectively assessing the risk of fetal hippocampal developmental toxicity.
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Affiliation(s)
- Liyi Wei
- Department of Obstetric, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, China
| | - Tingting Wang
- Department of Obstetric, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, China
| | - Mingcui Luo
- Department of Obstetric, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, China
| | - Shuai Zhang
- Department of Obstetric, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, China
| | - Mengxi Lu
- Department of Obstetric, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, China
| | - Xinli Zhou
- Department of Pharmacology, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Xuelei Cheng
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Hui Wang
- Department of Pharmacology, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China; Hubei Provincial Key Laboratory of Developmentally Originated Disease, Wuhan, 430071, China
| | - Dan Xu
- Department of Obstetric, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, China; Hubei Provincial Key Laboratory of Developmentally Originated Disease, Wuhan, 430071, China.
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Kong Z, Zhu L, Liu Y, Liu Y, Chen G, Jiang T, Wang H. Effects of azithromycin exposure during pregnancy at different stages, doses and courses on testicular development in fetal mice. Biomed Pharmacother 2024; 170:116063. [PMID: 38154271 DOI: 10.1016/j.biopha.2023.116063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 12/16/2023] [Accepted: 12/21/2023] [Indexed: 12/30/2023] Open
Abstract
Azithromycin is a commonly used antibiotic during pregnancy, but some studies have suggested its potential developmental toxicity. Currently, the effects and mechanisms of prenatal azithromycin exposure (PAzE) on fetal testicular development are still unclear. The effects of prenatal exposure to the same drug on fetal testicular development could vary depending on different stages, doses, and courses. Hence, in this study, based on clinical medication characteristics, Kunming mice was administered intragastrically with azithromycin at different stages (mid-/late-pregnancy), doses (50, 100, 200 mg/kg·d), and courses (single-/multi-course). Fetal blood and testicular samples were collected on GD18 for relevant assessments. The results indicated that PAzE led to changes in fetal testicular morphology, reduced cell proliferation, increased apoptosis, and decreased expression of markers related to Leydig cells (Star), Sertoli cells (Wt1), and spermatogonia (Plzf). Further investigation revealed that the effects of PAzE on fetal testicular development were characterized by mid-pregnancy, high dose (clinical dose), and single course having more pronounced effects. Additionally, the TGFβ/Smad and Nrf2 signaling pathways may be involved in the changes in fetal testicular development induced by PAzE. In summary, this study confirmed that PAzE influences fetal testicular morphological development and multicellular function. It provided theoretical and experimental evidence for guiding the rational use of azithromycin during pregnancy and further exploring the mechanisms underlying its developmental toxicity on fetal testicles.
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Affiliation(s)
- Ziyu Kong
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China
| | - Lu Zhu
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China
| | - Yi Liu
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China
| | - Yi Liu
- Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Guanghui Chen
- Wuhan University People's Hospital, Wuhan 430071, China
| | - Tao Jiang
- Suizhou Emergency Medical Center, Suizhou 441300, China.
| | - Hui Wang
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China; Hubei Provincial Key Laboratory of Developmentally Originated Disease, Wuhan 430071, China.
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Lu X, Mao T, Dai Y, Zhu L, Li X, Ao Y, Wang H. Azithromycin exposure during pregnancy disturbs the fetal development and its characteristic of multi-organ toxicity. Life Sci 2023; 329:121985. [PMID: 37516432 DOI: 10.1016/j.lfs.2023.121985] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/24/2023] [Accepted: 07/26/2023] [Indexed: 07/31/2023]
Abstract
AIMS Azithromycin is widely used in clinical practice for treating maternal infections during pregnancy. Meanwhile, azithromycin, as an "emerging pollutant", is increasingly polluting the environment due to the rapidly increasing usage (especially after the COVID-19). Previous studies have suggested a possible teratogenic risk of prenatal azithromycin exposure (PAzE), but its effects on fetal multi-organ development are still unclear. This study aimed to explore the potential impacts of PAzE. MATERIALS AND METHODS We focused on pregnancy outcomes, maternal/fetal serum phenotypes, and fetal multiple organ development in mice at different doses (50/200 mg/kg·d) during late pregnancy or at 200 mg/kg·d during different stages (mid-/late-pregnancy) and courses (single-/multi-course). KEY FINDINGS The results showed PAzE increased the rate of the absorbed fetus during mid-pregnancy and increased the intrauterine growth retardation rate (IUGR) during late pregnancy. PAzE caused multiple blood phenotypic changes in maternal and fetal mice, among which the number and degree of changes in fetal blood indicators were more significant. Moreover, PAzE inhibited long bone/cartilage development and adrenal steroid synthesis, promoting hepatic lipid production and ovarian steroid synthesis in varying degrees. The order of severity might be bone/cartilage > liver > gonads > other organs. PAzE-induced multi-organ alterations differed in stages, courses doses and fetal sex. The most apparent changes might be in high-dose, mid-pregnancy, multi-course, and female, while there was no typical rule for a dose-response relationship. SIGNIFICANCE This study confirmed PAzE could cause fetal developmental abnormalities and multi-organ functional alterations, which deepens the comprehensive understanding of azithromycin's fetal developmental toxicity.
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Affiliation(s)
- Xiaoqian Lu
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China
| | - Tongyun Mao
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China
| | - Yongguo Dai
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China
| | - Lu Zhu
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China
| | - Xiaomin Li
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China
| | - Ying Ao
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China; Hubei Provincial Key Laboratory of Developmentally Originated Diseases, Wuhan 430071, China.
| | - Hui Wang
- Department of Pharmacology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, China; Hubei Provincial Key Laboratory of Developmentally Originated Diseases, Wuhan 430071, China.
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Zhang W, Miao H, Liu J, Wu H, Wang Y, Gu P, Lei N, Yang K, Zheng Z, Li Q. Response of submerged macrophytes and biofilms to coexisting azithromycin and tetracycline: Antibiotic resistance genes removal, toxicity assessment and microbial properties. Aquat Toxicol 2023; 256:106410. [PMID: 36724685 DOI: 10.1016/j.aquatox.2023.106410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 01/20/2023] [Accepted: 01/24/2023] [Indexed: 06/18/2023]
Abstract
Antibiotics, such as azithromycin (AZ), tetracycline (TC), and their related antibiotic resistance genes (ARGs), create serious ecological risks to aquatic organisms. This study examined the response mechanisms of submerged macrophytes and periphytic biofilms to a mixture of AZ and TC pollution and determined the antibiotic removal efficiencies and fate of ARGs. The results showed that the plant-biofilm system had a significant capacity for removing both single and combined antibiotics with removal efficiencies of 93.06% ∼99.80% for AZ and 73.35% ∼97.74% for TC. Higher ARG (tetA, tetC, tetW, ermF, ermX, and ermB) abundances were observed in the biofilm, and subsequent exposure to the antibiotic mixture increased the abundances of these genes. Both single and combined antibiotics triggered antioxidant stress, but antagonistic effects were induced only with mixed AZ and TC exposure. Furthermore, the antibiotics changed the structural characteristics of extracellular polysaccharides and induced alterations in the structure of the biofilm microbial community. Increased N-acylated-l-homoserine lactone confirmed alternations in microbial quorum-sensing. The results extend the understanding of the fate of antibiotics and ARGs when aquatic plants and biofilms are exposed to antibiotic mixtures, as well as the organism's response mechanisms.
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Affiliation(s)
- Weizhen Zhang
- College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, PR China
| | - Hengfeng Miao
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, PR China
| | - Jing Liu
- College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, PR China
| | - Hanqi Wu
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China
| | - Yuting Wang
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, PR China
| | - Peng Gu
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, PR China
| | - Ningfei Lei
- College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, PR China
| | - Kunlun Yang
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, PR China
| | - Zheng Zheng
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China
| | - Qi Li
- College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, PR China; State Key Laboratory of Geohazard Prevention and Geoenviroment Protection, Chengdu University of Technology, Chengdu 610059, PR China.
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Badraoui R, Mannai G, Siddiqui AJ, Pacioglu O, Rudayni HA, Boufahja F, Essid N. How toxic is the COVID-19 drug azithromycin in the presence of Posidonia oceanica? Toxicokinetics and experimental approach of meiobenthic nematodes from a metallically pristine area. Environ Pollut 2023; 319:121007. [PMID: 36608722 PMCID: PMC9808061 DOI: 10.1016/j.envpol.2023.121007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 12/27/2022] [Accepted: 01/02/2023] [Indexed: 06/17/2023]
Abstract
The current study presents the results of an experiment carried to assess the impact of azithromycin, a COVID-19 drug, probably accumulated in marine sediments for three years, since the start of the pandemic, on benthic marine nematodes. It was explored the extent to which a common macrophyte from the Mediterranean Sea influenced the toxic impact of azithromycin on meiobenthic nematodes. Metals are known to influence toxicity of azithromycin. The nematofauna from a metallically pristine site situated in Bizerte bay, Tunisia, was exposed to two concentrations of azithromycin [i.e. 5 and 10 μg l-1]. In addition, two masses of the common macrophyte Posidonia oceanica [10 and 20% Dry Weight (DW)] were considered and associated with azithromycin into four possible combinations. The abundance and the taxonomic diversity of the nematode communities decreased significantly following the exposure to azithromycin, which was confirmed by the toxicokinetic data and behaving as substrate for P-glycoprotein (P-gp). The toxicity of 5 μg l-1 dosage of azithromycin was partially reduced at 10% DW of Posidonia and completely at 20% DW. The results showed that 5 μg l-1 of azithromycin can be reduced by the macrophyte P. oceanica when present in the environment at low masses as 10% DW.
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Affiliation(s)
- Riadh Badraoui
- Department of Biology, Laboratory of General Biology, University of Ha'il, Ha'il, 81451, Saudi Arabia; Section of Histology-Cytology, Medicine Faculty of Tunis, University of Tunis El Manar, La Rabta-Tunis, 1007, Tunisia
| | - Ghofrane Mannai
- University of Carthage, Faculty of Sciences of Bizerte, Laboratory of Environment Biomonitoring, Coastal Ecology and Ecotoxicology Unit, 7021, Zarzouna, Tunisia
| | - Arif J Siddiqui
- Department of Biology, Laboratory of General Biology, University of Ha'il, Ha'il, 81451, Saudi Arabia
| | - Octavian Pacioglu
- National Institute of Research and Development for Biological Sciences, Bucharest, Romania
| | - Hassan A Rudayni
- Biology Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 11623, Saudi Arabia
| | - Fehmi Boufahja
- Biology Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 11623, Saudi Arabia.
| | - Naceur Essid
- University of Carthage, Faculty of Sciences of Bizerte, Laboratory of Environment Biomonitoring, Coastal Ecology and Ecotoxicology Unit, 7021, Zarzouna, Tunisia
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Monahan C, Morris D, Nag R, Cummins E. Risk ranking of macrolide antibiotics - Release levels, resistance formation potential and ecological risk. Sci Total Environ 2023; 859:160022. [PMID: 36368382 DOI: 10.1016/j.scitotenv.2022.160022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 10/16/2022] [Accepted: 11/03/2022] [Indexed: 06/16/2023]
Abstract
Antibiotic resistance (AR) development in natural water bodies is a significant source of concern. Macrolide antibiotics in particular have been identified as pollutants of concern for AR development throughout the literature, as well as by state and international authorities. This study utilises a probabilistic model to examine the risk of AR development arising from human-use macrolide residues, utilising administration rates from Ireland as a case study. Stages modelled included level of administration, excretion, degradation in wastewater, removal in wastewater treatment, assuming conventional activated sludge (CAS) treatment, and dilution. Release estimates per day, as well as risk quotient values for antibiotic resistance development and ecological impact, are generated for erythromycin, clarithromycin, and azithromycin. In the modelled scenario in which conventional activated sludge treatment is utilised in wastewater treatment, this model ranks risk of resistance development for each antibiotic in the order clarithromycin > azithromycin > erythromycin, with mean risk quotient values of 0.50, 0.34 and 0.12, respectively. A membrane bioreactor scenario was also modelled, which reduced risk quotient values for all three macrolides by at least 50 %. Risk of ecological impact for each antibiotic was also examined, by comparing environmental concentrations predicted to safety limits based on toxicity data for cyanobacteria and other organisms from the literature, with azithromycin being identified as the macrolide of highest risk. This study compares and quantifies the risk of resistance development and ecological impact for a high-risk antibiotic group in the Irish context, and demonstrates the potential for risk reduction achieved by adoption of alternative (e.g. membrane bioreactor) technology.
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Affiliation(s)
- Ciaran Monahan
- School of Biosystems and Food Engineering, University College Dublin, Dublin, Ireland.
| | - Dearbhaile Morris
- Antimicrobial Resistance and Microbial Ecology Group, School of Medicine, National University of Ireland, Galway, Ireland
| | - Rajat Nag
- School of Biosystems and Food Engineering, University College Dublin, Dublin, Ireland
| | - Enda Cummins
- School of Biosystems and Food Engineering, University College Dublin, Dublin, Ireland
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Smaali A, Berkani M, Benmatti H, Lakhdari N, Al Obaid S, Alharbi SA, Fakhreddine B, Ines A, Marouane F, Rezania S, Lakhdari N. Degradation of Azithromycin from aqueous solution using Chlorine-ferrous- oxidation: ANN-GA modeling and Daphnia magna biotoxicity test assessment. Environ Res 2022; 214:114026. [PMID: 35977588 DOI: 10.1016/j.envres.2022.114026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Revised: 07/24/2022] [Accepted: 07/30/2022] [Indexed: 06/15/2023]
Abstract
Azithromycin (AZM), an antibacterial considered one of the most consumed drugs, especially during the period against the Covid 19 pandemic, and it is one of the persistent contaminants that can be released into aquatic ecosystems. The purpose of this study is to determine the efficacy of a Fenton-like process (chlorine/iron) for the degradation of AZM in an aqueous medium by determining the impact of several factors (the initial concentration of (FeSO4, NaClO, pollutant), and the initial pH) on the degradation rate. The Response Surface Methodology (RSM) based on the Box-Wilson design as well as the Artificial Neural Network (ANN) modeling combined with a genetic algorithm (GA) approaches were used to determine the optimal levels of the selected variables and the optimal rate of degradation. The quadratic model of multi-linear regression developed indicated that the optimal conditions were a concentration of chlorine of 600 μM, the concentration of AZM is 32.8 mg/L, the mass of the catalyst FeSO4 is 3.5 mg and a pH of 2.5, these optimal values gave a predicted and experimental yield of 64.05% and 70% respectively, the lack of fit test in RSM modeling (F0 = 3.31 which is inferior to Fcritic (0.05, 10.4) = 5.96) indicates that the true regression function is not linear therefore, the ANN-GA modeling as non-linear regression indicated that the optimal conditions were a concentration of chlorine of 256 μM, the concentration of AZM is 5 mg/L, the mass of the catalyst FeSO4 is 9.5 mg and a pH of 2.8, these optimal values gave a predicted and experimental yield of 79.69% and close to 80% respectively, Furthermore, biotoxicity tests were conducted to confirm the performance of our process using bio-indicators called daphnia (Daphnia magna), which demonstrated the efficacy of the like-Fenton process after 4 h of degradation.
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Affiliation(s)
- Anfel Smaali
- Laboratoire Biotechnologies, Ecole Nationale Supérieure de Biotechnologie, Ville Universitaire Ali Mendjeli, BP E66 25100, Constantine, Algeria
| | - Mohammed Berkani
- Laboratoire Biotechnologies, Ecole Nationale Supérieure de Biotechnologie, Ville Universitaire Ali Mendjeli, BP E66 25100, Constantine, Algeria.
| | - Hadjer Benmatti
- Laboratoire Biotechnologies, Ecole Nationale Supérieure de Biotechnologie, Ville Universitaire Ali Mendjeli, BP E66 25100, Constantine, Algeria
| | - Nadjem Lakhdari
- Laboratoire Biotechnologies, Ecole Nationale Supérieure de Biotechnologie, Ville Universitaire Ali Mendjeli, BP E66 25100, Constantine, Algeria
| | - Sami Al Obaid
- Department of Botany and Microbiology, College of Science, King Saud University, PO Box -2455, Riyadh, 11451, Saudi Arabia
| | - Sulaiman Ali Alharbi
- Department of Botany and Microbiology, College of Science, King Saud University, PO Box -2455, Riyadh, 11451, Saudi Arabia
| | - Belhadef Fakhreddine
- Laboratoire de Biologie et Environnement, Campus Chaab-Erssas, Biopole université des frères Mentouri Constantine 1, Ain Bey, 25000, Constantine, Algeria
| | - Amri Ines
- Laboratoire SARL HupPharma 25100, Constantine, Algeria
| | - Fateh Marouane
- Laboratoire Biotechnologies, Ecole Nationale Supérieure de Biotechnologie, Ville Universitaire Ali Mendjeli, BP E66 25100, Constantine, Algeria
| | - Shahabaldin Rezania
- Department of Environment and Energy, Sejong University, Seoul, 05006, South Korea
| | - Nadjem Lakhdari
- Laboratoire Biotechnologies, Ecole Nationale Supérieure de Biotechnologie, Ville Universitaire Ali Mendjeli, BP E66 25100, Constantine, Algeria
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Almeida AC, Gomes T, Lomba JAB, Lillicrap A. Specific toxicity of azithromycin to the freshwater microalga Raphidocelis subcapitata. Ecotoxicol Environ Saf 2021; 222:112553. [PMID: 34325198 DOI: 10.1016/j.ecoenv.2021.112553] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 07/12/2021] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
Pharmaceuticals are produced to inflict a specific physiological response in organisms. However, as only partially metabolized after administration, these types of compounds can also originate harmful side effects to non-target organisms. Additionally, there is still a lack of knowledge on the toxicological effects of legacy pharmaceuticals such as the antibiotic azithromycin. This macrolide occurs at high concentrations in the aquatic environment and can constitute a threat to aquatic organisms that are at the basis of the aquatic food chain, namely microalgae. This study established a high-throughput methodology to study the toxicity of azithromycin to the freshwater microalga Raphidocelis subcapitata. Flow cytometry and pulse amplitude modulated (PAM) fluorometry were used as screening tools. General toxicity was shown by effects in growth rate, cell size, cell complexity, cell viability and cell cycle. More specific outcomes were indicated by the analysis of mitochondrial and cytoplasmatic membrane potentials, DNA content, formation of ROS and LPO, natural pigments content and photosystem II performance. The specific mode of action (MoA) of azithromycin to crucial components of microalgae cells was revealed. Azithromycin had a negative impact on the regulation of energy dissipation at the PSII centers, along with an insufficient protection by the regulatory mechanisms leading to photodamage. The blockage of photosynthetic electrons led to ROS formation and consequent oxidative damage, affecting membranes and DNA. Overall, the used methodology exhibited its high potential for detecting the toxic MoA of compounds in microalgae and should be considered for future risk assessment of pharmaceuticals.
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Affiliation(s)
- Ana Catarina Almeida
- Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, Oslo 0349, Norway.
| | - Tânia Gomes
- Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, Oslo 0349, Norway
| | | | - Adam Lillicrap
- Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, Oslo 0349, Norway
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Mao Y, Yu Y, Ma Z, Li H, Yu W, Cao L, He Q. Azithromycin induces dual effects on microalgae: Roles of photosynthetic damage and oxidative stress. Ecotoxicol Environ Saf 2021; 222:112496. [PMID: 34243111 DOI: 10.1016/j.ecoenv.2021.112496] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 07/02/2021] [Accepted: 07/04/2021] [Indexed: 06/13/2023]
Abstract
Antibiotics are frequently detected in aquatic ecosystems, posing a potential threat to the freshwater environment. However, the response mechanism of freshwater microalgae to antibiotics remains inadequately understood. Here, the impacts of azithromycin (a broadly used antibiotic) on microalgae Chlorella pyrenoidosa were systematically studied. The results revealed that high concentrations (5-100 μg/L) of azithromycin inhibited algal growth, with a 96-h half maximal effective concentration of 41.6 μg/L. Azithromycin could weaken the photosynthetic activities of algae by promoting heat dissipation, inhibiting the absorption and trapping of light energy, impairing the reaction centre, and blocking electron transfer beyond QA. The blockage of the electron transport chain in the photosynthetic process further induced the generation of reactive oxygen species (ROS). The increases in the activities of superoxide dismutase, peroxidase and glutathione played important roles in antioxidant systems but were still not enough to scavenge the excessive ROS, thus resulting in the oxidative damage indicated by the elevated malondialdehyde level. Furthermore, azithromycin reduced the energy reserves (protein, carbohydrate and lipid) and impaired the cellular structure. In contrast, a hormesis effect on algal growth was found when exposed to low concentrations (0.5 and 1 μg/L) of azithromycin. Low concentrations of azithromycin could induce the activities of the PSII reaction centre by upregulating the mRNA expression of psbA. Additionally, increased chlorophyll b and carotenoids could improve the absorption of light energy and decrease oxidative damage, which further contributed to the increase in energy reserves (protein, carbohydrate and lipid). The risk quotients of azithromycin calculated in this study were higher than 1, suggesting that azithromycin could pose considerable ecological risks in real environments. The present work confirmed that azithromycin induced dual effects on microalgae, which provided new insight for understanding the ecological risk of antibiotics.
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Affiliation(s)
- Yufeng Mao
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China; Key Laboratory of Hydraulic and Waterway Engineering, Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China; Lingzhi Environmental Protection Co., Ltd, Wuxi 214200, China
| | - Yang Yu
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Zixin Ma
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Hong Li
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Weiwei Yu
- Key Laboratory of Hydraulic and Waterway Engineering, Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China
| | - Li Cao
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Qiang He
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China.
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da Luz TM, Araújo APDC, Estrela FN, Braz HLB, Jorge RJB, Charlie-Silva I, Malafaia G. Can use of hydroxychloroquine and azithromycin as a treatment of COVID-19 affect aquatic wildlife? A study conducted with neotropical tadpole. Sci Total Environ 2021; 780:146553. [PMID: 33774288 PMCID: PMC7969824 DOI: 10.1016/j.scitotenv.2021.146553] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/11/2021] [Accepted: 03/13/2021] [Indexed: 05/03/2023]
Abstract
The impacts on human health and the economic and social disruption caused by the pandemic COVID-19 have been devastating. However, its environmental consequences are poorly understood. Thus, to assess whether COVID-19 therapy based on the use of azithromycin (AZT) and hydroxychloroquine (HCQ) during the pandemic affects wild aquatic life, we exposed (for 72 h) neotropical tadpoles of the species Physalaemus cuvieri to the water containing these drugs to 12.5 μg/L. We observed that the increase in superoxide dismutase and catalase in tadpoles exposed to AZT (alone or in combination with HCQ) was predominant to keep the production of NO, ROS, TBARS and H2O2 equitable between the experimental groups. In addition, the uptake of AZT and the strong interaction of AZT with acetylcholinesterase (AChE), predicted by the molecular docking analysis, were associated with the anticholinesterase effect observed in the groups exposed to the antibiotic. However, the unexpected increase in butyrylcholinesterase (BChE) in these same groups suggests its constitutive role in maintaining cholinergic homeostasis. Therefore, taken together, our data provide a pioneering evidence that the exposure of P. cuvieri tadpoles to AZT (alone or in combination with HCQ) in a predictably increased environmental concentration (12.5 μg/L) elicits a compensatory adaptive response that can have, in the short period of exposure, guaranteed the survival of the animals. However, the high energy cost for maintaining physiological homeostasis, can compromise the growth and development of animals and, therefore, in the medium-long term, have a general negative effect on the health of animals. Thus, it is possible that COVID-19 therapy, based on the use of AZT, affects wild aquatic life, which requires greater attention to the impacts that this drug may represent.
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Affiliation(s)
| | | | - Fernanda Neves Estrela
- Laboratório de Pesquisas Biológicas, Instituto Federal Goiano, Urutaí, GO, Brazil; Programa de Pós-Graduação em Biotecnologia e Biodiversidade, Universidade Federal de Goiás, Goiânia, GO, Brazil
| | - Helyson Lucas Bezerra Braz
- Programa de Pós-Graduação em Ciências Morfofuncionais, Universidade Federal do Ceará, Fortaleza, CE, Brazil
| | | | - Ives Charlie-Silva
- Programa de Pós-Graduação em Ciências Morfofuncionais, Universidade Federal do Ceará, Fortaleza, CE, Brazil; Institute de Ciências Biológicas, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Guilherme Malafaia
- Laboratório de Pesquisas Biológicas, Instituto Federal Goiano, Urutaí, GO, Brazil; Programa de Pós-Graduação em Biotecnologia e Biodiversidade, Universidade Federal de Goiás, Goiânia, GO, Brazil; Programa de Pós-Graduação em Ecologia e Conservação de Recursos Naturais, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil; Programa de Pós-Graduação em Conservação de Recursos Naturais do Cerrado, Instituto Federal Goiano, Urutaí, GO, Brazil.
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12
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González-Pleiter M, Pedrouzo-Rodríguez A, Verdú I, Leganés F, Marco E, Rosal R, Fernández-Piñas F. Microplastics as vectors of the antibiotics azithromycin and clarithromycin: Effects towards freshwater microalgae. Chemosphere 2021; 268:128824. [PMID: 33176914 DOI: 10.1016/j.chemosphere.2020.128824] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 10/10/2020] [Accepted: 10/27/2020] [Indexed: 05/07/2023]
Abstract
Water pollution due to microplastics (MPs) is recognized as a major anthropogenic impact. Once MPs reach the ecosystems, they are exposed to a variety of other pollutants, which can be sorbed on them, transported and eventually desorbed. In this work, we tested the hypothesis that MPs can behave as conveyors for delivering chemicals toxic to aquatic microorganisms by investigating the vector role of MPs of polyethylene terephthalate (PET), polylactic acid (PLA), polyoxymethylene (POM) and polystyrene (PS) to the macrolide antibiotics azithromycin (AZI) and clarithromycin (CLA). AZI and CLA were chosen, as they are included in the Watch List for EU monitoring concerning water policy by Decision (EU) 2018/840. MPs were loaded in contact with 500 μg/L of AZI or 1000 μg/L of CLA. Results showed that both antibiotics were sorbed on all tested MPs. The more hydrophobic AZI was sorbed in higher proportion than CLA. Both antibiotics were desorbed from MPs upon contact with water with percentages between 14.6 ± 2.6% for AZI and 1.9 ± 1.4% for CLA of the concentrations to which the MPs were initially exposed. Virgin MPs were not toxic to the cyanobacterium Anabaena sp. PCC7120. However, antibiotic-loaded MPs significantly inhibited the growth and chlorophyll content of the cyanobacterium. Most of the sorbed antibiotics became released upon contact with cyanobacterial cultures, which was the cause for the observed toxicity. Therefore, MPs can play a role as vectors of antibiotics in freshwaters systems affecting the basic trophic level of photosynthetic microorganisms.
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Affiliation(s)
- Miguel González-Pleiter
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049, Madrid, Spain; Departamento de Ingeniería Química, Universidad de Alcalá, Alcalá de Henares, E-28871, Madrid, Spain.
| | - Alicia Pedrouzo-Rodríguez
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049, Madrid, Spain
| | - Irene Verdú
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049, Madrid, Spain
| | - Francisco Leganés
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049, Madrid, Spain
| | - Eduardo Marco
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049, Madrid, Spain
| | - Roberto Rosal
- Departamento de Ingeniería Química, Universidad de Alcalá, Alcalá de Henares, E-28871, Madrid, Spain
| | - Francisca Fernández-Piñas
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049, Madrid, Spain
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Li Y, Ma Y, Yang L, Duan S, Zhou F, Chen J, Liu Y, Zhang B. Effects of azithromycin on feeding behavior and nutrition accumulation of Daphnia magna under the different exposure pathways. Ecotoxicol Environ Saf 2020; 197:110573. [PMID: 32278825 DOI: 10.1016/j.ecoenv.2020.110573] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 03/26/2020] [Accepted: 03/31/2020] [Indexed: 05/03/2023]
Abstract
Antibiotics had been paid more and more attention to their toxicity to non-target aquatic organisms in the aquatic environment. As azithromycin (AZI) was an important antibiotic pollutant in water, its toxicity to aquatic organisms had been investigated. In this study, the potential aquatic ecological risk of AZI was identified by assessing the toxicity on the feeding behavior and physiological function of Daphnia magna (D. magna) under the different exposure pathways (aqueous phase exposure vs. food phase exposure). For the food Chlorella pyrenoidosa (C. pyrenoidosa), AZI could inhibit the growth and nutrition accumulation with concentration- and time-response relationship. For D. magna, the feeding behavior was inhibited by AZI under the aqueous phase exposure pathway. However, the feeding behavior was inhibited firstly and then reversed into promotion in the low and medium concentration groups and was continually promoted in the high concentration group under the food phase exposure pathway. The accumulation of polysaccharides and total protein were decreased in D. magna n the high concentration group under the aqueous phase exposure pathway, while the accumulation of polysaccharides and crude fat were decreased in the high concentration group under the food phase exposure pathway. The activity of amylase (AMS) and trypsin in D. magna were decreased after exposure to AZI under the aqueous phase exposure pathway. On the other hand, the activity of AMS in the medium and high concentration groups was decreased under the food phase exposure pathway, but the activity of trypsin was decreased in the medium concentration group and increased in the high concentration group. The levels of ROS in D. magna were also measured and increased in both exposure pathways except in the low concentration group under the food phase exposure pathway, indicating the oxidative stress injury of D. magna. Our results showed that AZI could affect the digestive enzyme activities and oxidative stress-antioxidative system, ultimately leading to the change of D. magna's feeding behavior and nutrition accumulation. These results also provided a comprehensive perspective to evaluate the toxic effects of non-lethal dose antibiotics to non-target aquatic organisms via different exposure pathways.
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Affiliation(s)
- Yang Li
- Department of Physiology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, 430030, China; School of Engineering, China Pharmaceutical University, Nanjing, 211198, China
| | - Yunfeng Ma
- School of Engineering, China Pharmaceutical University, Nanjing, 211198, China
| | - Likun Yang
- Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Shengzi Duan
- School of Engineering, China Pharmaceutical University, Nanjing, 211198, China
| | - Fanqi Zhou
- School of Engineering, China Pharmaceutical University, Nanjing, 211198, China
| | - Jianqiu Chen
- School of Engineering, China Pharmaceutical University, Nanjing, 211198, China
| | - Yanhua Liu
- School of Engineering, China Pharmaceutical University, Nanjing, 211198, China.
| | - Bin Zhang
- Department of Physiology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, 430030, China.
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Sidhu H, O'Connor G, McAvoy D. Risk assessment of biosolids-borne ciprofloxacin and azithromycin. Sci Total Environ 2019; 651:3151-3160. [PMID: 30463165 DOI: 10.1016/j.scitotenv.2018.10.194] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 10/11/2018] [Accepted: 10/14/2018] [Indexed: 06/09/2023]
Abstract
Ciprofloxacin (CIP) and azithromycin (AZ) are commonly prescribed antibiotics for various infections in humans and are frequently detected in biosolids. Ecological and human health risks from biosolids-borne CIP and AZ are not well understood, but necessary for formulating policies on safe use and management of biosolids. A tiered integrated risk assessment (IRA), based on the World Health Organization (WHO) framework and the USEPA Part 503 Biosolids Rule, was conducted to assess human and ecological health risks from biosolids-borne CIP and AZ. The IRA utilized the hazard quotient (HQ) approach to evaluate risks to various receptors of concern (including humans, animals, and birds) in sixteen exposure pathways and three conservative biosolids land application scenarios. The scenarios consisted of (i) single-heavy (100 Mg ha-1) land application of biosolids containing 95th percentile concentrations of CIP or AZ (USEPA, 2009), (ii) long-term (annual for 40-y) land application of biosolids containing typical (median; USEPA, 2009) CIP or AZ concentrations, and (iii) long-term (annual for 40-y) land application of biosolids containing the 95th percentile concentrations of CIP or AZ. The unrealistically conservative screening level (Tier 1) assessment identified three pathways of potential concern: biosolids → soil → plant (CIP); biosolids → soil → soil organism (CIP and AZ); and biosolids → soil → soil organism → predator (CIP and AZ). Subsequent tier (refined; more realistic) assessments and pollutant limits (calculated based on the USEPA Part 503 Biosolids Rule) suggested negligible human and ecological health risks from biosolids-borne CIP and AZ under real-world biosolids application scenarios. Pollutant concentration limits were 12 mg CIP kg-1 and 2.2 mg AZ kg-1; suggesting that pollutant load tracking is not needed for the majority (75% for CIP and 90% for AZ) of USA biosolids. Biosolids-borne antibiotic resistance (currently not addressed in any risk assessment model) is the principal uncertainty limiting risk assessment of biosolids-borne antibiotics including CIP and AZ.
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Affiliation(s)
- Harmanpreet Sidhu
- Soil and Water Sciences Department, University of Florida, Gainesville, FL 32611, United States of America.
| | - George O'Connor
- Soil and Water Sciences Department, University of Florida, Gainesville, FL 32611, United States of America
| | - Drew McAvoy
- Chemical and Environmental Engineering Department, University of Cincinnati, Cincinnati, OH 45221, United States of America
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15
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Sidhu H, O'Connor G, Kruse J. Plant toxicity and accumulation of biosolids-borne ciprofloxacin and azithromycin. Sci Total Environ 2019; 648:1219-1226. [PMID: 30340267 DOI: 10.1016/j.scitotenv.2018.08.218] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 08/16/2018] [Accepted: 08/17/2018] [Indexed: 06/08/2023]
Abstract
Trace organic chemicals (TOrCs) in land applied biosolids can cause phytotoxicities and contaminate human and animal food chains. Information on phytotoxicity and phytoaccumulation of environmentally relevant concentrations of two antibiotic TOrCs, ciprofloxacin (CIP) and azithromycin (AZ), from biosolids-amended soils is limited. Greenhouse studies were conducted to assess the plant toxicity and accumulation of a range of environmentally relevant concentrations of biosolids-borne CIP and AZ in biosolids-amended soils. Separate studies assessed phytotoxicity potential of soil-borne CIP and AZ (soils directly spiked with the target antibiotics without biosolids) at concentrations much greater than those of environmental relevance in biosolids-amended soils. Both the biosolids-borne and the soil-borne antibiotic studies involved three plants (radish (Raphanus sativus), lettuce (Lactuca sativa), and tall fescue grass (Festuca arundinacea)) of different morphologies, physiologies, and chemical exposure scenarios. Phytotoxicity and phytoaccumulation from the biosolids-borne antibiotics were minimal at environmentally relevant concentrations, even in sand. The separate phytotoxicity experiments involving the soil-borne antibiotics revealed no observed adverse effect concentration (NOAEC) of 3.2 mg kg-1 (AZ) and 36.1 mg kg-1 (CIP) for the three plants grown in soils mimicking typical agricultural soils. These NOAEC values are about 100-fold greater than the antibiotic concentrations expected in biosolids-amended soils. NOAEC values under an unrealistic worst-case where the antibiotics were directly spiked to sand (NOAEC = 3.2 mg kg-1 for AZ; and ≥0.36 mg kg-1 for CIP) were also greater than the environmentally relevant concentrations of the biosolids-borne antibiotics. The results suggest that land application of biosolids-borne CIP and AZ pose De minimis risks to plants. Point estimates of plant bioaccumulation factors (dry weight basis) were 0.01 (CIP) and 0.1 (AZ), suggesting minimal impacts of the target TOrCs on human and/or animal food chains.
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Affiliation(s)
- Harmanpreet Sidhu
- Soil and Water Sciences Department, University of Florida, Gainesville, FL 32611, United States of America.
| | - George O'Connor
- Soil and Water Sciences Department, University of Florida, Gainesville, FL 32611, United States of America
| | - Jason Kruse
- Environmental Horticulture Department, University of Florida, Gainesville, FL 32611, United States of America
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Guo Q, Du Z, Shao B. Simulation and experimental study on the mechanism of the chlorination of azithromycin. J Hazard Mater 2018; 359:31-39. [PMID: 30014912 DOI: 10.1016/j.jhazmat.2018.07.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 06/11/2018] [Accepted: 07/05/2018] [Indexed: 06/08/2023]
Abstract
Azithromycin (AZI) has been listed as an emerging contaminant by the US EPA since 2009 because it is frequently detected in wastewater, surface water, and drinking water. In this paper, the chlorination of AZI in drinking water was simulated and studied. The results indicated that new compounds were generated in the chlorination of AZI. The byproducts were identified by liquid chromatography-quadrupole-time-of-flight mass spectrometry (LC-Q-TOF), and four of the byproducts were detected in real water samples. The kinetic studies demonstrated that the reaction rates of AZI chlorination were dependent on the initial concentration of free chlorine and the pH value. The potential toxicities of the byproducts were assessed by quantitative structure-activity relationship software and investigated by the viability of Chinese hamster lung (CHL), Jurkat T and Hep G2 cells.
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Affiliation(s)
- Qiaozhen Guo
- College of Science, Beijing University of Chemical Technology, Beijing 100029, China; Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing Center for Disease Control & Prevention, Beijing 100013, China
| | - Zhenxia Du
- College of Science, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Bing Shao
- Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing Center for Disease Control & Prevention, Beijing 100013, China; Beijing Advanced Innovation Center for Food Nutrition and Human Health, China Agricultural University, Beijing 100193, China.
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Fu L, Huang T, Wang S, Wang X, Su L, Li C, Zhao Y. Toxicity of 13 different antibiotics towards freshwater green algae Pseudokirchneriella subcapitata and their modes of action. Chemosphere 2017; 168:217-222. [PMID: 27783962 DOI: 10.1016/j.chemosphere.2016.10.043] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 10/07/2016] [Accepted: 10/12/2016] [Indexed: 05/05/2023]
Abstract
Although modes of action (MOAs) play a key role in the understanding of the toxic mechanism of chemicals, the MOAs have not been investigated for antibiotics to green algae. This paper is to discriminate excess toxicity from baseline level and investigate the MOAs of 13 different antibiotics to algae by using the determined toxicity values. Comparison of the toxicities shows that the inhibitors of protein synthesis to bacteria, such as azithromycin, doxycycline, florfenicol and oxytetracycline, exhibit significantly toxic effects to algae. On the other hand, the cell wall synthesis inhibitors, such as cefotaxime and amoxicillin, show relatively low toxic effects to the algae. The concentrations determined by HPLC indicate that quinocetone and amoxicillin can be easily photodegraded or hydrolyzed during the toxic tests. The toxic effects of quinocetone and amoxicillin to the algae are attributed to not only their parent compounds, but also their metabolites. Investigation on the mode of action shows that, except rifampicin, all the tested antibiotics exhibit excess toxicity to Pseudokirchneriella subcapitata (P. subcapitata). These antibiotics can be identified as reactive modes of action to the algae. They act as electrophilic mechanism of action to P. subcapitata. These results are valuable for the understanding of the toxic mechanism to algae.
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Affiliation(s)
- Ling Fu
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin 130117, PR China; College of Agricultural Engineering, Nanyang Normal University, Nanyang, Henan 473061, PR China
| | - Tao Huang
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin 130117, PR China
| | - Shuo Wang
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin 130117, PR China
| | - Xiaohong Wang
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin 130117, PR China
| | - Limin Su
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin 130117, PR China
| | - Chao Li
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin 130117, PR China.
| | - Yuanhui Zhao
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin 130117, PR China.
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Azithromycin does not look cardiotoxic in a general population. BMJ 2013; 346:f2896. [PMID: 23657186 DOI: 10.1136/bmj.f2896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Thomsen MB, Beekman JDM, Attevelt NJM, Takahara A, Sugiyama A, Chiba K, Vos MA. No proarrhythmic properties of the antibiotics Moxifloxacin or Azithromycin in anaesthetized dogs with chronic-AV block. Br J Pharmacol 2006; 149:1039-48. [PMID: 17088870 PMCID: PMC2014631 DOI: 10.1038/sj.bjp.0706900] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND & PURPOSE The therapeutically available quinolone antibiotic moxifloxacin has been used as a positive control for prolonging the QT interval in both clinical and non-clinical studies designed to assess the potential of new drugs to delay cardiac repolarization. Despite moxifloxacin prolonging QT, it has not been shown to cause torsades de pointes arrhythmias (TdP). Azithromycin is a macrolide antibiotic that has rarely been associated, clinically, with cases of proarrhythmia. As there is a lack of clinical data available, the cardiac safety of these drugs was assessed in a TdP-susceptible animal model by evaluating their repolarization and proarrhythmia effects. EXPERIMENTAL APPROACH & KEY RESULTS In transfected HEK cells, the IC(50)s for I (hERG) were 45+/-6 and 856+/-259 microg ml(-1) for moxifloxacin and azithromycin, respectively. Intravenous administration of 2 and 8 mg kg(-1) moxifloxacin (total peak-plasma concentrations 4.6+/-1.5 and 22.9+/-6.8 microg ml(-1)) prolonged the QT(c) in 6 anaesthetized dogs with chronic AV block by 7+/-3 and 21+/-19%, respectively. Similar intravenous doses of azithromycin (total peak-plasma concentrations 5.4+/-1.3 and 20.8+/-4.9 microg ml(-1)) had no electrophysiological effects in the same dogs. The reference compound, dofetilide (25 microg kg(-1) i.v.) caused QT(c) prolongation (29+/-15%) and TdP in all dogs. Beat-to-beat variability of repolarization (BVR), quantified as short-term variability of the left ventricular monophasic action potential duration, was only increased after dofetilide (1.8+/-0.7 to 3.8+/-1.5 ms; P<0.05). CONCLUSION & IMPLICATIONS As neither moxifloxacin nor azithromycin caused TdP or an increase in the BVR, we conclude that both drugs can be used safely in clinical situations.
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Affiliation(s)
- M B Thomsen
- Department of Medical Physiology, Heart Lung Centre Utrecht, University Medical Center Utrecht Utrecht, The Netherlands
| | - J D M Beekman
- Department of Medical Physiology, Heart Lung Centre Utrecht, University Medical Center Utrecht Utrecht, The Netherlands
| | - N J M Attevelt
- Department of Medical Physiology, Heart Lung Centre Utrecht, University Medical Center Utrecht Utrecht, The Netherlands
| | - A Takahara
- Department of Pharmacology, University of Yamanashi Yamanashi, Japan
| | - A Sugiyama
- Department of Pharmacology, University of Yamanashi Yamanashi, Japan
| | - K Chiba
- New Product Research Laboratories II, Daiichi Pharmaceutical Co., Ltd Tokyo, Japan
| | - M A Vos
- Department of Medical Physiology, Heart Lung Centre Utrecht, University Medical Center Utrecht Utrecht, The Netherlands
- Author for correspondence:
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Inoue K, Kumakura SI, Uchida M, Tsutsui T. Effects of eight antibacterial agents on cell survival and expression of epithelial-cell- or cell-adhesion-related genes in human gingival epithelial cells. J Periodontal Res 2004; 39:50-8. [PMID: 14687228 DOI: 10.1111/j.1600-0765.2004.00704.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE AND BACKGROUND Our previous studies suggest that little adverse effect on the growth of the periodontal ligament would be expected, if tetracycline, minocycline, ofloxacin, roxithromycin, clarithromycin, and azithromycin were topically administered to the periodontal pocket at their MIC90 doses required to inhibit the growth of 90% of periodontopathic bacteria, including Porphyromonas gingivalis, Prevotella intermedia, and Actinobacillus actinomycetemcomitans. In the present study, we investigated the cytocidal effects of eight antibacterial agents on the human gingival epithelial cell line NDUSD-1. We also used NDUSD-1 cells to examine the effects of these agents on the mRNA and protein expressions of genes associated with the proliferation, differentiation, or cellular adhesion important to the epithelial regeneration of the periodontal attachment. METHODS The cytocidal effect of the test agents was measured as a decrease in cell survival. To obtain a quantitative measure of the cytocidal effect, the LD50, i.e. the concentration which results in a 50% decrease in cell survival relative to the controls, was extrapolated from the concentration-response curves. The effects of the agents on the mRNA and protein expressions in NDUSD-1 cells were studied by reverse transcription-polymerase chain reaction (RT-PCR) and western blot analyses, respectively. RESULTS The cytocidal effect increased in a concentration-dependent manner as the concentration of each of the eight test agents increased. The order of the agents according to their cytocidal effects (LD50) was minocycline > tetracycline > enoxacin > clarithromycin > roxythromycin approximately ofloxacin > azithromycin > erythromycin. The cytocidal effects of minocycline, tetracycline, enoxacin, clarithromycin, roxythromycin, ofloxacin, and azithromycin ranged from 1.2 to 23.2 times greater than that of erythromycin. The maximum non-cytocidal concentrations (MNCCs) of these agents for NDUSD-1 cells were: 0.3 microm for minocycline, 1 microm for tetracycline, 3 microm for ofloxacin and erythromycin, 10 microm for enoxacin, clarithromycin, and azithromycin, and 100 microm for roxythromycin. The MNCCs of ofloxacin, azithromycin, clarithromycin, and roxythromycin were greater than their MIC90 concentrations for periodontopathic bacteria described above. The effects on the mRNA and protein expressions of epithelial-cell- or cell-adhesion-related genes were examined in NDUSD-1 cells exposed to clarithromycin, roxythromycin, ofloxacin, and azithromycin at their MNCCs. None of the agents affected the mRNA expressions of five genes: keratinocyte growth factor receptor, keratin 18, integrin beta1, integrin beta4, and laminin 5gamma2. Clarithromycin and ofloxacin slightly decreased the protein expression of integrin beta4. Roxythromycin markedly decreased the protein expressions of integrin beta4 and laminin 5gamma2. Azithromycin had little inhibitory effects on the protein expressions of any of the five genes. CONCLUSIONS These results suggest that little, if any, adverse effects on growth, differentiation, and adhesion of basal epithelial cells would be expected with topical administration of clarithromycin, ofloxacin or azithromycin to the periodontal pocket at a dose equivalent to the MIC90. It is important to note, however, that the extrapolation of these findings to in vivo conditions has yet to be undertaken.
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Affiliation(s)
- Kiichiro Inoue
- Oral and Maxillofacial Surgery, The Nippon Dental University Hospital at Tokyo, Japan
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Romanowska-Sarlej J, Matysiak W, Kifer-Wysocka E, Czerny K, Masłyk T, Piskórz J. Ultrastructure of the hepatocytes after application of azithromycin (Sumamed). Ann Univ Mariae Curie Sklodowska Med 2004; 59:57-60. [PMID: 16146049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Azithromycin (Sumamed, PLIVA Cracow) was administered intragastrically to rats in doses 10 times and 100 times bigger than the therapeutic dose (according to the indications for a 5-day treatment). Ultrastructural examinations of the liver were performed. Changes observed in the morphology of hepatocytes and Browicz-Kupffer cells (swelling of mitochondria, more numerous lysosomes, weaker RER content and granular material inside biliary canaliculi) may indicate temporary violation of the functional equilibrium in the liver due to the application of azithromycin.
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Uzun C, Koten M, Adali MK, Yorulmaz F, Yagiz R, Karasalihoglu AR. Reversible ototoxic effect of azithromycin and clarithromycin on transiently evoked otoacoustic emissions in guinea pigs. J Laryngol Otol 2001; 115:622-8. [PMID: 11535141 DOI: 10.1258/0022215011908676] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The possible cochlear toxicity of systemically applied macrolides--erythromycin (ER), azithromycin (AZ) and clarithromycin(CL)--was investigated in guinea pigs by measuring transiently evoked otoacoustic emissions (TEOAEs). A single dose of 125 mg/kg intravenous (i.v.) ER caused no change in TEOAEs in guinea pigs (p>0.05), whereas AZ (45 mg/kg orally) and CL (75 mg/kg i.v.) reversibly reduced the emission response (p<0.05). The reversible reduction of TEOAE responses due to AZ and CL, which is in accordance with the clinical picture of AZ and CL ototoxicity, could likely be attributable to the transient dysfunction of outer hair cells. The present study reveals that at least one ototoxic effect of AZ and CL is on the inner ear. The results may also encourage planning clinical researches on TEOAE monitoring in patients receiving high doses of AZ or CL.
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Affiliation(s)
- C Uzun
- Department of Otorhinolaryngology, Trakya University, Faculty of Medicine, Edirne, Turkey.
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Ohtani H, Taninaka C, Hanada E, Kotaki H, Sato H, Sawada Y, Iga T. Comparative pharmacodynamic analysis of Q-T interval prolongation induced by the macrolides clarithromycin, roxithromycin, and azithromycin in rats. Antimicrob Agents Chemother 2000; 44:2630-7. [PMID: 10991836 PMCID: PMC90127 DOI: 10.1128/aac.44.10.2630-2637.2000] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In order to evaluate the arrhythmogenic potency of macrolide antibiotics in a quantitative manner, we analyzed the influence of clarithromycin (CAM), roxithromycin (RXM), and azithromycin (AZM) on Q-T intervals from pharmacokinetic and pharmacodynamic points of view and in comparison with the potency of erythromycin (EM) previously reported by us for rats. Male Sprague-Dawley rats were anesthetized, and CAM (6.6, 21.6, and 43.2 mg/kg of body weight/h), RXM (20 and 40 mg/kg/h), and AZM (40 and 100 mg/kg/h) were intravenously injected for 90 min to obtain the time courses of drug concentrations in plasma and the changes in the Q-T intervals during and after the drug injections. Distinct Q-T interval prolongation of up to 10 ms was observed with CAM at its clinical concentrations. RXM and AZM evoked Q-T interval prolongation at concentrations higher than their clinical ranges. The potencies for Q-T interval prolongation, assessed as the slope of the concentration-response relationship, were 6.09, 0.536, and 0.989 ms. ml/microg for CAM, RXM, and AZM, respectively. There was hysteresis between the change in the Q-T intervals and the time course of the plasma concentration of each drug. The rank order of clinical arrhythmogenicity was estimated to be EM > CAM > RXM > AZM, as assessed from the present results and our previous report for EM. In conclusion, RXM and AZM were estimated to be less potent at provoking arrhythmia than EM and CAM. These results should be useful for making a safer choice of an appropriate agent for patients with electrocardiographic risk factors.
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Affiliation(s)
- H Ohtani
- Department of Pharmacy, University of Tokyo Hospital, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
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Affiliation(s)
- A L Tseng
- Immunodeficiency Clinic, Toronto Hospital-Toronto General Division, Ontario, Canada
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Evans LA, Genereux PE, Gibbs EM, Sutton SC. Predicting injection site muscle damage. III: Evaluation of intramuscular formulations in the L6 cell model. Pharm Res 1996; 13:1585-7. [PMID: 8899856 DOI: 10.1023/a:1016004318459] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- L A Evans
- Pharmaceutical R & D Department, Pfizer, Inc., Groton, Connecticut 06340, USA
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Abstract
Cytotoxicity of erythromycin base, erythromycin estolate, erythromycin-11,12-cyclic carbonate, roxithromycin, clarithromycin and azithromycin was compared in cultured human non-malignant Chang liver cells using reduction of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide and cellular protein concentration as end points of toxicity. Erythromycin estolate was the most toxic macrolide in all tests differing clearly from all the other macrolides studied. Erythromycin-11,12-cyclic carbonate was also more toxic than the other macrolides. Roxithromycin and clarithromycin were the next toxic derivatives, while erythromycin base and azithromycin were least toxic. Thus, cytotoxicity of the new semisynthetic macrolides, roxithromycin, clarithromycin and azithromycin, is not substantially different from that of erythromycin base. In view of the low level of hepatotoxicity of macrolides hitherto reported in humans, the results do not suggest any substantial risk for hepatic disorders related to the use of azithromycin, clarithromycin and roxithromycin.
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Affiliation(s)
- M Viluksela
- Department of Pharmacology and Toxicology, University of Helsinki, Finland.
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Onyeji CO, Nightingale CH, Tessier PR, Nicolau DP, Bow LM. Activities of clarithromycin, azithromycin, and ofloxacin in combination with liposomal or unencapsulated granulocyte-macrophage colony-stimulating factor against intramacrophage Mycobacterium avium-Mycobacterium intracellulare. J Infect Dis 1995; 172:810-6. [PMID: 7658075 DOI: 10.1093/infdis/172.3.810] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
The effects of ofloxacin, clarithromycin, and azithromycin in combination with granulocyte-macrophage colony-stimulating factor (GM-CSF) against Mycobacterium avium-Mycobacterium intracellulare (MAI) were evaluated in an in vitro human macrophage infection model. Treatment of MAI-infected macrophages with GM-CSF alone induced a maximal killing effect at 1000 U/mL, and the potency was increased 100-fold by encapsulating the cytokine within liposomes. Antibiotics were applied at concentrations close to their clinically achievable serum trough and peak levels. Addition of GM-CSF to azithromycin and therapeutic trough concentrations of ofloxacin and clarithromycin was associated with significant (P < .01) augmentation of antimycobacterial activity compared with the effects of the agents alone. However, the enhancement effect by GM-CSF was not seen with therapeutic peak concentrations of ofloxacin and clarithromycin. Thus, GM-CSF may be a useful adjunct in the treatment of MAI infections with azithromycin, clarithromycin, and ofloxacin.
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Affiliation(s)
- C O Onyeji
- Department of Pharmacy Research, Office of Research Administration, Hartford Hospital, Connecticut 06102, USA
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Fortner JH, Milisen WB, Lundeen GR, Jakowski AB, Marsh PM. Tapetal effect of an azalide antibiotic following oral administration in beagle dogs. Fundam Appl Toxicol 1993; 21:164-73. [PMID: 8405779 DOI: 10.1006/faat.1993.1086] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
An azalide antibiotic (CP-62,993) was administered at 100 mg/kg by oral gavage once daily for 35 consecutive days to 3 normal Beagle dogs (tapetal) and 3 Beagle dogs lacking a clinically apparent ocular tapetum (atapetal). The total dose delivered was approximately 100-fold the recommended clinical dose. Bilateral ophthalmoscopic changes were observed in the treated tapetal dogs on Day 36, consisting of mild to moderate tapetal decoloration with loss of the normal color change at the junction with the nontapetal fundus and muting of reflectivity of the normally highly reflective tapetum; treated atapetal and all control tapetal and atapetal dogs had no ophthalmoscopic changes. Microscopic examination of ocular tissue revealed rudimentary tapetal cell layers in the correct location in untreated, clinically atapetal eyes. Tapetal cells from treated tapetal and atapetal dogs were swollen and vacuolated, and contained intracytoplasmic, electron-dense debris but no recognizable tapetal rodlets. Lysosomal lamellar bodies were observed in the retinal ganglion cells of both treated groups and were neither enhanced nor reduced by the presence of a functional tapetum. Necrosis and inflammation were not observed in any ocular tissue. The altered ophthalmoscopic appearance of treated tapetal dogs was not influenced by the retinal changes because any effect on retinal transparency would have been seen in treated atapetal dogs. The decoloration and muting of reflectivity observed clinically in the tapetal fundus of dogs following prolonged exposure to high levels of CP-62,993 result from unique changes within the ocular tapetum itself and cannot be interpreted to be of consequence to nontapetal species including humans.
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Affiliation(s)
- J H Fortner
- Drug Safety Evaluation, Pfizer Inc., Groton, Connecticut 06340
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