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Gao J, Chen S, Lin S, Mei X. Prussian blue analogues improves the microenvironment after spinal cord injury by regulating Zn. Int Immunopharmacol 2024; 131:111868. [PMID: 38493692 DOI: 10.1016/j.intimp.2024.111868] [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: 11/17/2023] [Revised: 03/04/2024] [Accepted: 03/11/2024] [Indexed: 03/19/2024]
Abstract
Mitochondrial injury, neuronal apoptosis and phenotypic transformation of macrophages are the main mechanisms of spinal cord injury. Based on the Prussian blue nanomase's strong ability to clear free radicals, the treatment of spinal cord injury with nano-zirconium (Pb-Zr) was carried out. The disease treatment strategy based on nanomaterials has excellent therapeutic effect, and Prussian blue analogs have good therapeutic properties, so the application prospects of Prussian blue analogs is broad. From the point of view of Prussian blue content, improving the presence of zirconium in the microenvironment significantly increased the activity of Prussian blue. Prussian Blue zirconium significantly improved lipopolysaccharide (LPS) and interferon (IFN-γ) induced neuronal cell (pc12 cells) and macrophage dysfunction by improving oxidative stress, inflammation, and apoptosis in the microenvironment. It can promote the recovery of motor function after spinal cord injury. In vivo experiments, it shows that Prussian blue zirconium can improve inflammation, apoptosis and oxidative stress of spinal cord tissue, promote regenerative therapy after spinal cord injury, and improve motor function. Moreover, it has been reported that high-priced Zr4+ cations can regulate the deposition and nucleation behavior of Zn2+ in high-performance zinc metal anodes. Therefore, we propose the hypothesis that Pb-Zr modulates Zn2+ be used to promote recovery from spinal cord injury. The results show that nanomaterial is beneficial in the treatment of spinal cord injury. This study provides a good prospect for the application of spinal cord injury treatment. It also provides an important feasibility for subsequent clinical conversions.
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Affiliation(s)
- Jinpeng Gao
- Department of Orthopedic of the Third Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning Province 121000, China; Key Laboratory of Medical Tissue Engineering, Jinzhou Medical University, Jinzhou, Liaoning Province 121000, China
| | - ShuRui Chen
- Department of Orthopedic of the Third Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning Province 121000, China; Key Laboratory of Medical Tissue Engineering, Jinzhou Medical University, Jinzhou, Liaoning Province 121000, China; Guangdong Second Provincial General Hospital, Integrated Chinese and Western Medicine Postdoctoral Research, Station School of Medicine, Jinan Guangzhou, Guangdong Province 510515, China
| | - Sen Lin
- Department of Orthopedic of the Third Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning Province 121000, China; Key Laboratory of Medical Tissue Engineering, Jinzhou Medical University, Jinzhou, Liaoning Province 121000, China.
| | - Xifan Mei
- Department of Orthopedic of the Third Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning Province 121000, China; Key Laboratory of Medical Tissue Engineering, Jinzhou Medical University, Jinzhou, Liaoning Province 121000, China.
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Dos Santos L, Carbone F, Pacreau E, Diarra S, Luka M, Pigat N, Baures M, Navarro E, Anract J, Barry Delongchamps N, Cagnard N, Bost F, Nemazanyy I, Petitjean O, Hamaï A, Ménager M, Palea S, Guidotti JE, Goffin V. Cell Plasticity in a Mouse Model of Benign Prostate Hyperplasia Drives Amplification of Androgen-Independent Epithelial Cell Populations Sensitive to Antioxidant Therapy. Am J Pathol 2024; 194:30-51. [PMID: 37827216 DOI: 10.1016/j.ajpath.2023.09.010] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/23/2023] [Accepted: 09/12/2023] [Indexed: 10/14/2023]
Abstract
Benign prostate hyperplasia (BPH) is caused by the nonmalignant enlargement of the transition zone of the prostate gland, leading to lower urinary tract symptoms. Although current medical treatments are unsatisfactory in many patients, the limited understanding of the mechanisms driving disease progression prevents the development of alternative therapeutic strategies. The probasin-prolactin (Pb-PRL) transgenic mouse recapitulates many histopathological features of human BPH. Herein, these alterations parallel urodynamic disturbance reminiscent of lower urinary tract symptoms. Single-cell RNA-sequencing analysis of Pb-PRL mouse prostates revealed that their epithelium mainly includes low-androgen signaling cell populations analogous to Club/Hillock cells enriched in the aged human prostate. These intermediate cells are predicted to result from the reprogramming of androgen-dependent luminal cells. Pb-PRL mouse prostates exhibited increased vulnerability to oxidative stress due to reduction of antioxidant enzyme expression. One-month treatment of Pb-PRL mice with anethole trithione (ATT), a specific inhibitor of mitochondrial ROS production, reduced prostate weight and voiding frequency. In human BPH-1 epithelial cells, ATT decreased mitochondrial metabolism, cell proliferation, and stemness features. ATT prevented the growth of organoids generated by sorted Pb-PRL basal and LSCmed cells, the two major BPH-associated, androgen-independent epithelial cell compartments. Taken together, these results support cell plasticity as a driver of BPH progression and therapeutic resistance to androgen signaling inhibition, and identify antioxidant therapy as a promising treatment of BPH.
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Affiliation(s)
- Leïla Dos Santos
- Institut Necker Enfants Malades, Université Paris Cité, INSERM UMR-S1151, CNRS UMR-S8253, Paris, France
| | - Francesco Carbone
- Laboratory of Inflammatory Responses and Transcriptomic Networks in Diseases, Imagine Institute, Université Paris Cité, Atip-Avenir Team, INSERM UMR 1163, Paris, France; Labtech Single-Cell@Imagine, Imagine Institute, INSERM UMR 1163, Paris, France
| | - Emeline Pacreau
- Institut Necker Enfants Malades, Université Paris Cité, INSERM UMR-S1151, CNRS UMR-S8253, Paris, France
| | - Sekou Diarra
- Humana Biosciences SAS, Prologue Biotech, Labège, France
| | - Marine Luka
- Institut Necker Enfants Malades, Université Paris Cité, INSERM UMR-S1151, CNRS UMR-S8253, Paris, France; Laboratory of Inflammatory Responses and Transcriptomic Networks in Diseases, Imagine Institute, Université Paris Cité, Atip-Avenir Team, INSERM UMR 1163, Paris, France
| | - Natascha Pigat
- Institut Necker Enfants Malades, Université Paris Cité, INSERM UMR-S1151, CNRS UMR-S8253, Paris, France
| | - Manon Baures
- Institut Necker Enfants Malades, Université Paris Cité, INSERM UMR-S1151, CNRS UMR-S8253, Paris, France
| | - Emilie Navarro
- Institut Necker Enfants Malades, Université Paris Cité, INSERM UMR-S1151, CNRS UMR-S8253, Paris, France
| | - Julien Anract
- Institut Necker Enfants Malades, Université Paris Cité, INSERM UMR-S1151, CNRS UMR-S8253, Paris, France; Urology Department, Hôpital Cochin, Assistance Publique Hôpitaux de Paris, Paris, France
| | - Nicolas Barry Delongchamps
- Institut Necker Enfants Malades, Université Paris Cité, INSERM UMR-S1151, CNRS UMR-S8253, Paris, France; Urology Department, Hôpital Cochin, Assistance Publique Hôpitaux de Paris, Paris, France
| | - Nicolas Cagnard
- Bioinformatics Core Platform, Université Paris Cité, Structure Fédérative de Recherche Necker, INSERM US24/CNRS UAR3633, Paris, France
| | - Frédéric Bost
- C3M, INSERM U1065, Université Côte d'Azur, Equipe Labélisée Ligue Nationale contre le Cancer, Nice, France
| | - Ivan Nemazanyy
- Metabolomics Core Facility, Université de Paris-Structure Fédérative de Recherche Necker, INSERM US24/CNRS UAR3633, Paris, France
| | | | - Ahmed Hamaï
- Institut Necker Enfants Malades, Université Paris Cité, INSERM UMR-S1151, CNRS UMR-S8253, Paris, France
| | - Mickaël Ménager
- Laboratory of Inflammatory Responses and Transcriptomic Networks in Diseases, Imagine Institute, Université Paris Cité, Atip-Avenir Team, INSERM UMR 1163, Paris, France; Labtech Single-Cell@Imagine, Imagine Institute, INSERM UMR 1163, Paris, France
| | - Stefano Palea
- Humana Biosciences SAS, Prologue Biotech, Labège, France
| | - Jacques-Emmanuel Guidotti
- Institut Necker Enfants Malades, Université Paris Cité, INSERM UMR-S1151, CNRS UMR-S8253, Paris, France
| | - Vincent Goffin
- Institut Necker Enfants Malades, Université Paris Cité, INSERM UMR-S1151, CNRS UMR-S8253, Paris, France.
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Frederico Rozada AM, Vilugron Rodrigues-Vendramini FA, Kioshima ES, Sampiron EG, de Lima Scodro RB, Caleffi-Ferracioli KR, Vicente Seixas FA, Basso EA, Freitas Gauze GD. Synthesis of 1,3,4-oxadiazoles with 4-methoxynaphthalene ring: discovering new compounds with antimicrobial activity. Future Med Chem 2023; 15:2239-2255. [PMID: 38014535 DOI: 10.4155/fmc-2023-0153] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 10/31/2023] [Indexed: 11/29/2023] Open
Abstract
Background: Paracoccidioidomycosis (PCM) is a systemic infection caused by Paracoccidioides spp. (Pb). PCM can be associated or clinically confused with tuberculosis (TB), another pulmonary infection, caused by Mycobacterium tuberculosis (Mtb). Futhermore, the long treatment time of TB and PCM and the cases of TB drug resistance impose difficulties for the cure of these diseases. Results: New 1,3,4-oxadiazoles containing the 4-methoxynaphthalene ring were synthesized and their antimicrobial activity was evaluated against Pb and Mtb. The derivative 6n (with 2-hydroxy-5-nitrophenyl subunit) is the most promising of the series. Conclusion: The 1,3,4-oxadiazole 6n can be used as a prototype drug candidate, with anti-Pb and anti-MTb activities, showing a broad-spectrum profile for the treatment of both pulmonary infections.
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Affiliation(s)
| | | | - Erika Seki Kioshima
- Department of Clinical Analysis & Biomedicine, Laboratory of Medical Mycology, State University of Maringá, Maringá, PR, 87020-900, Brazil
| | - Eloísa Gibin Sampiron
- Postgraduate Program in Health Sciences, State University of Maringa, Maringá, PR, 87020-900, Brazil
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Chatterjee A, Singh N, Chanu WK, Singh CB, Nagaraj VA. Phytochemical screening, cytotoxicity assessment and evaluation of in vitro antiplasmodial and in vivo antimalarial activities of Mentha spicata L. methanolic leaf extract. J Ethnopharmacol 2022; 298:115636. [PMID: 35998785 DOI: 10.1016/j.jep.2022.115636] [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: 05/10/2022] [Revised: 08/04/2022] [Accepted: 08/08/2022] [Indexed: 06/15/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Malaria causes extensive morbidity and mortality, and the decreasing efficacy of artemisinin and its partner drugs has posed a serious concern. Therefore, it is important to identify new antimalarials, and the natural compounds from plants provide a promising platform. Mentha spicata L. representing the Lamiaceae family has been used in traditional medicine for various diseases including malaria. AIM OF THE STUDY This study was aimed at evaluating the antiplasmodial activity of M. spicata methanolic leaf extract using Plasmodium falciparum (Pf) cultures (Pf3D7 and artemisinin (ART)-resistant PfCam3.IR539T strains) and antimalarial activity using Plasmodium berghei (Pb)-infected mice. Dry leaf powder and methanolic leaf extract were examined for in vivo antimalarial activity and the efficacy of oral versus parenteral administration was compared. MATERIALS AND METHODS Leaves of M. spicata were collected and extracted using 70% methanol in water (v/v). [3H]-hypoxanthine incorporation assays and Giemsa-stained smears were used to assess the in vitro antiplasmodial activity of M. spicata methanolic extract against Pf3D7 and ART-resistant PfCam3.IR539T strains. Cytotoxicity was evaluated in HeLa and HEK-293T cell lines using MTT assays. Hemolysis assays were performed using red blood cells (RBCs). In vivo antimalarial activities of M. spicata dry leaf powder and methanolic leaf extract were examined in P. berghei-infected mice by Rane's curative test and Peters' 4-day suppressive test. RESULTS Phytochemical screening of M. spicata methanolic leaf extract indicated the presence of reducing sugars, phenolic compounds, flavonoids, glycosides, sterols, saponins, alkaloids, coumarins, tannins, carbohydrates, and proteins. In vitro studies carried out using Pf cultures showed that M. spicata methanolic leaf extract had significant antiplasmodial activity against Pf3D7 cultures with a 50% inhibitory concentration (IC50) of 57.99 ± 2.82 μg/ml. The extract was also effective against ART-resistant PfCam3.IR539T strain with an IC50 of 71.23 ± 3.85 μg/ml. The extract did not show significant in vitro cytotoxicity, hemolysis, and in vivo toxicity. In vivo studies performed using Pb-infected mice treated with M. spicata dry leaf powder and methanolic leaf extract showed ∼50% inhibition in parasite growth at 1500 mg/kg and 1000 mg/kg doses, respectively. There was also a significant delay in the mortality of treated mice. Parenteral administration was found to be appropriate for the in vivo treatment. CONCLUSIONS Our in vitro and in vivo findings from Pf and Pb parasites suggested the therapeutic potential of M. spicata leaf extract as an antimalarial. M. spicata leaf extract could also inhibit the growth of ART-resistant Pf strain. Further studies on fractionation and active component analysis of M. spicata leaf extract would be required to identify the bioactive phytochemicals having pharmaceutical and therapeutic values. Such efforts would help us in developing new antimalarials to combat malaria.
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Affiliation(s)
- Aditi Chatterjee
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, 751023, Odisha, India; School of Biotechnology, Kalinga Institute of Industrial Technology, Bhubaneswar, 751024, Odisha, India.
| | - Nalini Singh
- Infectious Disease Biology, Institute of Life Sciences, Bhubaneswar, 751023, Odisha, India.
| | - Wahengbam Kabita Chanu
- Plant Bioresources Division, Institute of Bioresources and Sustainable Development, Imphal, 795001, Manipur, India.
| | - Chingakham Brajakishor Singh
- Plant Bioresources Division, Institute of Bioresources and Sustainable Development, Imphal, 795001, Manipur, India.
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Oselusi SO, Christoffels A, Egieyeh SA. Cheminformatic Characterization of Natural Antimicrobial Products for the Development of New Lead Compounds. Molecules 2021; 26:molecules26133970. [PMID: 34209681 PMCID: PMC8271829 DOI: 10.3390/molecules26133970] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 05/29/2021] [Accepted: 06/02/2021] [Indexed: 12/26/2022] Open
Abstract
The growing antimicrobial resistance (AMR) of pathogenic organisms to currently prescribed drugs has resulted in the failure to treat various infections caused by these superbugs. Therefore, to keep pace with the increasing drug resistance, there is a pressing need for novel antimicrobial agents, especially from non-conventional sources. Several natural products (NPs) have been shown to display promising in vitro activities against multidrug-resistant pathogens. Still, only a few of these compounds have been studied as prospective drug candidates. This may be due to the expensive and time-consuming process of conducting important studies on these compounds. The present review focuses on applying cheminformatics strategies to characterize, prioritize, and optimize NPs to develop new lead compounds against antimicrobial resistance pathogens. Moreover, case studies where these strategies have been used to identify potential drug candidates, including a few selected open-access tools commonly used for these studies, are briefly outlined.
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Affiliation(s)
- Samson Olaitan Oselusi
- School of Pharmacy, University of the Western Cape, Bellville, Cape Town 7535, South Africa;
- Correspondence:
| | - Alan Christoffels
- South African Medical Research Council Bioinformatics Unit, South African National Bioinformatics Institute, University of the Western Cape, Cape Town 7535, South Africa;
| | - Samuel Ayodele Egieyeh
- School of Pharmacy, University of the Western Cape, Bellville, Cape Town 7535, South Africa;
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Abstract
Purpose Electron radiotherapy is a labor-intensive treatment option that is complicated by the need for field shaping blocks. These blocks are typically made from casting Cerrobend alloys containing lead and cadmium. This is a highly toxic process with limited precision. This work aims to provide streamlined and more precise electron radiotherapy by 3D using printing techniques. Methods The 3D printed electron cutout consists of plastic shells filled with 2 mm diameter tungsten ball bearings. Five clinical Cerrobend defined field were compared to the planned fields by measuring the light field edge when mounted in the electron applicator on a linear accelerator. The dose transmitted through the 3D printed and Cerrobend cutouts was measured using an IC profiler ion chamber array with 6 MeV and 16 MeV beams. Dose profiles from the treatment planning system were also compared to the measured dose profiles. Centering and full width half maximum (FWHM) metrics were taken directly from the profiler software. Results The transmission of a 16MeV beam through a 12 mm thick layer of tungsten ball bearings agreed within 1% of a 15 mm thick Cerrobend block (measured with an ion chamber array). The radiation fields shaped by ball bearing filled 3D printed cutout were centered within 0.4 mm of the planned outline, whereas the Cerrobend cutout fields had shift errors of 1–3 mm, and shape errors of 0.5–2 mm. The average shift of Cerrobend cutouts was 2.3 mm compared to the planned fields (n = 5). Beam penumbra of the 3D printed cutouts was found to be equivalent to the 15 mm thick Cerrobend cutout. The beam profiles agreed within 1.2% across the whole 30 cm profile widths. Conclusions This study demonstrates that with a proper quality assurance procedure, 3D-printed cutouts can provide more accurate electron radiotherapy with reduced toxicity compared to traditional Cerrobend methods.
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Affiliation(s)
- Lawrie Skinner
- Department of Radiation Oncology, Stanford University, Palo Alto, CA, United States of America
| | - Benjamin P. Fahimian
- Department of Radiation Oncology, Stanford University, Palo Alto, CA, United States of America
| | - Amy S. Yu
- Department of Radiation Oncology, Stanford University, Palo Alto, CA, United States of America
- * E-mail:
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Mittal R, Woo FW, Castro CS, Cohen MA, Karanxha J, Mittal J, Chhibber T, Jhaveri VM. Organ-on-chip models: Implications in drug discovery and clinical applications. J Cell Physiol 2019; 234:8352-8380. [PMID: 30443904 DOI: 10.1002/jcp.v234.610.1002/jcp.27729] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 10/22/2018] [Indexed: 05/26/2023]
Abstract
Before a lead compound goes through a clinical trial, preclinical studies utilize two-dimensional (2D) in vitro models and animal models to study the pharmacodynamics and pharmacokinetics of that lead compound. However, these current preclinical studies may not accurately represent the efficacy and safety of a lead compound in humans, as there has been a high failure rate of drugs that enter clinical trials. All of these failures and the associated costs demonstrate a need for more representative models of human organ systems for screening in the preclinical phase of drug development. In this study, we review the recent advances in in vitro modeling including three-dimensional (3D) organoids, 3D microfabrication, and 3D bioprinting for various organs including the heart, kidney, lung, gastrointestinal tract (intestine-gut-stomach), liver, placenta, adipose, retina, bone, and brain as well as multiorgan models. The availability of organ-on-chip models provides a wealth of opportunities to understand the pathogenesis of human diseases and provide a potentially better model to screen a drug, as these models utilize a dynamic 3D environment similar to the human body. Although there are limitations of organ-on-chip models, the emergence of new technologies have refined their capability for translational research as well as precision medicine.
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Affiliation(s)
- Rahul Mittal
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida
| | - Frank W Woo
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida
| | - Carlo S Castro
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida
| | - Madeline A Cohen
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida
| | - Joana Karanxha
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida
| | - Jeenu Mittal
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida
| | - Tanya Chhibber
- University Institute of Pharmaceutical Sciences, UGC Centre of Advanced Studies, Panjab University, Chandigarh, India
| | - Vasanti M Jhaveri
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, Florida
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Calvet CM, Choi JY, Thomas D, Suzuki B, Hirata K, Lostracco-Johnson S, de Mesquita LB, Nogueira A, Meuser-Batista M, Silva TA, Siqueira-Neto JL, Roush WR, de Souza Pereira MC, McKerrow JH, Podust LM. 4-aminopyridyl-based lead compounds targeting CYP51 prevent spontaneous parasite relapse in a chronic model and improve cardiac pathology in an acute model of Trypanosoma cruzi infection. PLoS Negl Trop Dis 2017; 11:e0006132. [PMID: 29281643 PMCID: PMC5744913 DOI: 10.1371/journal.pntd.0006132] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 11/22/2017] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Chagas disease, caused by the protozoan Trypanosoma cruzi, is the leading cause of heart failure in Latin America. The clinical treatment of Chagas disease is limited to two 60 year-old drugs, nifurtimox and benznidazole, that have variable efficacy against different strains of the parasite and may lead to severe side effects. CYP51 is an enzyme in the sterol biosynthesis pathway that has been exploited for the development of therapeutics for fungal and parasitic infections. In a target-based drug discovery program guided by x-ray crystallography, we identified the 4-aminopyridyl-based series of CYP51 inhibitors as being efficacious versus T.cruzi in vitro; two of the most potent leads, 9 and 12, have now been evaluated for toxicity and efficacy in mice. METHODOLOGY/PRINCIPAL FINDINGS Both acute and chronic animal models infected with wild type or transgenic T. cruzi strains were evaluated. There was no evidence of toxicity in the 28-day dosing study of uninfected animals, as judged by the monitoring of multiple serum and histological parameters. In two acute models of Chagas disease, 9 and 12 drastically reduced parasitemia, increased survival of mice, and prevented liver and heart injury. None of the compounds produced long term sterile cure. In the less severe acute model using the transgenic CL-Brenner strain of T.cruzi, parasitemia relapsed upon drug withdrawal. In the chronic model, parasitemia fell to a background level and, as evidenced by the bioluminescence detection of T. cruzi expressing the red-shifted luciferase marker, mice remained negative for 4 weeks after drug withdrawal. Two immunosuppression cycles with cyclophosphamide were required to re-activate the parasites. Although no sterile cure was achieved, the suppression of parasitemia in acutely infected mice resulted in drastically reduced inflammation in the heart. CONCLUSIONS/SIGNIFICANCE The positive outcomes achieved in the absence of sterile cure suggest that the target product profile in anti-Chagasic drug discovery should be revised in favor of safe re-administration of the medication during the lifespan of a Chagas disease patient. A medication that reduces parasite burden may halt or slow progression of cardiomyopathy and therefore improve both life expectancy and quality of life.
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Affiliation(s)
- Claudia Magalhaes Calvet
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, United States of America
- Cellular Ultra-Structure Laboratory, Oswaldo Cruz Institute (IOC), FIOCRUZ, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Jun Yong Choi
- Department of Chemistry, Scripps Florida, Jupiter, Florida, United States of America
| | - Diane Thomas
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, United States of America
| | - Brian Suzuki
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, United States of America
| | - Ken Hirata
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, United States of America
| | - Sharon Lostracco-Johnson
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, United States of America
| | - Liliane Batista de Mesquita
- Cellular Ultra-Structure Laboratory, Oswaldo Cruz Institute (IOC), FIOCRUZ, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Alanderson Nogueira
- Cellular Ultra-Structure Laboratory, Oswaldo Cruz Institute (IOC), FIOCRUZ, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marcelo Meuser-Batista
- Department of Pathologic Anatomy, Fernandes Figueira Institute (IFF), FIOCRUZ, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Tatiana Araujo Silva
- Cellular Ultra-Structure Laboratory, Oswaldo Cruz Institute (IOC), FIOCRUZ, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Jair Lage Siqueira-Neto
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, United States of America
| | - William R. Roush
- Department of Chemistry, Scripps Florida, Jupiter, Florida, United States of America
| | | | - James H. McKerrow
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, United States of America
| | - Larissa M. Podust
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, United States of America
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10
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Lin SH, Wang XR, Yu ITS, Tang WNJ, Li J, Liu BOY. Lead powder use for skin care and elevated blood lead level among children in a Chinese rural area. J Expo Sci Environ Epidemiol 2012; 22:198-203. [PMID: 22166809 DOI: 10.1038/jes.2011.46] [Citation(s) in RCA: 10] [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] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Accepted: 08/08/2011] [Indexed: 05/31/2023]
Abstract
To investigate the association between lead powder use, as folk skin care, and blood lead level (BLL) in children, we studied 222 children up to 14-years old living in a Chinese rural area and administered a face to face interview with their parents to collect information on lead powder use and other potential exposure. We measured children's BLL at baseline and 2 years later after an intervention. The children were divided into three categories according to their use of lead powder: regular use, irregular use and never use. We applied multivariate linear regression to determine the association between lead powder use and elevated BLL. The average BLL of all children was 18 μg/dl; 56% of them had BLL of 10 μg/dl or higher. Lead powder use was significantly associated with elevated BLL. After adjusting for potential confounders the BLL of regular and irregular users was higher than non-users by 3.11 μg/dl and 1.47 μg/dl, respectively. Duration of lead powder use was positively associated with BLL, but the time since last use was inversely associated. A significant BLL reduction was observed 2 years later, and the greatest reduction (21 μg/dl) was seen in the youngest group of regular users. This study showed that traditional use of lead powder for a skin care purpose was a major contributor to elevated BLL in these children.
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Affiliation(s)
- Si-Hao Lin
- School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
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Abstract
Targeted α-particle therapy offers the potential for more specific tumor cell killing with less damage to surrounding normal tissue than β-emitters because of the combination of short path length (50-80 μm) with the high linear energy transfer (100 keV μm(-1)) of this emission. These physical properties offer the real possibility of targeted (pre-targeted) α-therapy suitable for the elimination of minimal residual or micrometastatic disease. Targeted and pre-targeted radioimmunotherapy (RIT) using α-emitters such as (212)Bi (T(1/2) = 1.01 h) and (212)Pb (T(1/2) = 10.6 h) has demonstrated significant utility in both in vitro and in vivo model systems. (212)Pb, a promising α-particle emitting source, is the longer-lived parent nuclide of (212)Bi, and serves as an in vivo generator of (212)Bi. The radionuclide has been successfully used in RIT and pre-targeted RIT and demonstrated an enhanced therapeutic efficacy in combination with chemotherapeutics, such as gemcitabine and paclitaxel. The following perspective addresses the modes of radionuclide production, radiolabelling and chelation chemistry, as well as the application of (212)Pb to targeted and pre-targeted radiation therapy.
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Affiliation(s)
- Kwon Yong
- Radioimmune & Inorganic Chemistry Section, Radiation Oncology Branch, National Cancer Institute, Building 10 Center Drive, Bethesda, Maryland, 20892-1088
| | - Martin W. Brechbiel
- Radioimmune & Inorganic Chemistry Section, Radiation Oncology Branch, National Cancer Institute, Building 10 Center Drive, Bethesda, Maryland, 20892-1088
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Koka S, Huber SM, Boini KM, Lang C, Föller M, Lang F. Lead decreases parasitemia and enhances survival of Plasmodium berghei-infected mice. Biochem Biophys Res Commun 2007; 363:484-9. [PMID: 17888870 DOI: 10.1016/j.bbrc.2007.08.173] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2007] [Accepted: 08/26/2007] [Indexed: 12/22/2022]
Abstract
Malaria, a disease accounting for more than one million deaths per year, is caused by intraerythrocytic growth of Plasmodia. Parasitemia may be blunted by suicidal erythrocyte death or eryptosis, which is characterized by cell shrinkage and phosphatidylserine exposure. Triggers of eryptosis include lead nitrate (Pb(NO3)2). As shown here, Pb(NO3)2 (> or = 10 microM) increased phosphatidylserine exposure of Plasmodium falciparum-infected human erythrocytes, an effect significantly more marked than in noninfected cells. Pb(NO3)2 treatment accelerated the clearance of erythrocytes from circulating blood. Parasitemia in Plasmodium berghei-infected mice was significantly decreased and mouse survival significantly enhanced by 100 microM Pb(NO3)2 (20 ppm) in drinking water. The treatment significantly increased reticulocyte number but did not significantly decrease erythrocyte number in noninfected mice and in infected animals mainly triggered the disappearance of P. berghei harbouring erythrocytes. In conclusion, Pb(NO3)2 accelerates eryptosis and subsequent clearance of infected erythrocytes and thus favourably influences the course of malaria.
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Affiliation(s)
- Saisudha Koka
- Department of Physiology, University of Tübingen, Gmelinstr. 5, D-72076 Tübingen, Germany
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13
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Affiliation(s)
- B P Surinov
- Medical Radiological Research Center, Russian Academy of Medical Sciences, Obninsk, Kaluga oblast 249038, Russia
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14
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Abstract
PURPOSE To use a phantom to prospectively examine the attenuating effect of barium sulfate as an internal shield to protect the fetus. MATERIALS AND METHODS In an adult-size phantom, 1- and 2-cm-thick acrylic slabs containing 315 or 630 mL of water, 2% or 40% barium sulfate suspension, and a 1-mm lead sheet were placed under the diaphragm. In 17 experiments, fetal dose was measured by using thermoluminescent dosimeters that were placed immediately under (near field) and 10 cm below (far field) the water slab (eight experiments), barium sulfate slab (eight experiments), and lead sheet (one experiment). In a pulmonary embolism protocol, the phantom was scanned with single-detector spiral computed tomography (CT) at 130 kVp and 230 mAs. RESULTS The control radiation dose was 3.60 mSv+/-0.54 (standard deviation) with the water slab at near field, where the uterus dome is at near term, and 0.507 mSv+/-0.07 with the water slab at far field, the uterus position during early gestation. Scattered radiation was attenuated 13% and 21% with 2% barium sulfate and 87% and 96% with 40% barium sulfate, as calculated in the near and far fields, respectively, and 99% with the 1-mm lead sheet. The extrapolated attenuations for 5%-40% barium sulfate suspensions indicated that beyond a 30% suspension, attenuation increased further only slightly. CONCLUSION Study results in the phantom experiment suggest that fetal irradiation during maternal chest CT can be reduced substantially with barium shielding.
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Affiliation(s)
- David K Yousefzadeh
- Department of Radiology, University of Chicago, 5841 S Maryland Ave, MC 2026, Chicago, IL 60637, USA.
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15
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Abstract
In responding to Drs Calabrese and Baldwin's question, 'At what point, if ever, should hormesis be employed as the principal dose response default assumption in risk assessment?', we examined the benefits of replacing traditional dose-response with hormesis. In general, hormesis provides more complete useful information for risk assessment than does traditional dose-response. A major limitation of using hormesis as a default assumption in risk estimation is the difficulty of differentiating complex low-level hormetic responses from the placebo effect. A second limitation is that hormesis merely further defines one response. Most toxicoses have many responses. The most complete information takes all responses and their connections into account.
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Affiliation(s)
- John A Pickrell
- Comparative Toxicology Laboratories, Department of Diagnostic Medicine/Pathobiology, 1800 N Denison Avenue, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506-5705, USA.
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Bogdarin IA, Bundin DV. [Basis for the use of a new galena-based substance from plants for prevention and treatment of cholelithic disease]. Eksp Klin Gastroenterol 2003:47-9, 117. [PMID: 14556547] [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: 04/27/2023]
Abstract
With the purpose of prevention and treatment of cholelithic disease, a new galena-based phytocomposition having the choleritic, cholekinetic, spasmolytic and hypocholesterolemic effects at the same time was administered to patients along with lithotripsy. Clinical manifestations of cholecystitis disappeared after a daily intake of the phytocomposition during 30 days in 96 patients out of 418 people having the diagnosis of cholelithic disease and high initial concentrations of?-lipoproteins and cholesterol in the blood serum. The level of lipids dropped reliably, and it became much easier to use the lithotripsy method. Due to the decrease of bile viscosity, it was possible to note easier elimination of fragments from the gallbladder. During the monotherapy with the galena-based phytocomposition, full litholisis of single (up to 30 mm) or multiple (up to 50% of the gallbladder volume) calculi was determined in seven patients out of 47 (17%) during the period from two to six months.
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Affiliation(s)
- Iu A Bogdarin
- Scientific Research Institute of Gastroenterology for Children, Russian Ministry of Health, City Hospital No. 28, Nizhni Novgorod
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17
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Abstract
BACKGROUND/AIM Halitosis, mainly caused by bacteria located on the posterior dorsum of the tongue and in periodontal pockets, is due to formation of volatile sulfur compounds (VSC). The hypothesis to be tested was that the affinity of a metal for sulfur determines its anti-VSC activity. METHOD Clinical tests were carried out on 12 subjects who rinsed with cysteine to induce halitosis (baseline) before rinsing with 7.34 mM ZnCl2, SnF2 and CuCl2. Mouth air VSC analyses were repeated following cysteine rinses at 1 h, 2 h and 3 h using a gas chromatograph. In vitro experiments tested toxic metals Hg2+, Pb2+ and Cd2+. 10-microl aliquots of metal salts were added to 1-ml aliquots of human whole saliva from 30 subjects. Samples were incubated overnight at 37oC and saliva headspace was analyzed for VSC in a gas chromatograph. CLINICAL RESULTS Cu2+>Sn2+>Zn2+ (supports hypothesis). Zn2+ had significantly less anti-VSC effect compared with Cu2+ and Sn2+ at 1, 2 and 3 h. In vitro results indicated that Hg2+, Cu2+ and Cd2+ had close to 100% anti-VSC effect, and that Pb2+ was less effective and Cd2+ more effective than expected in inhibiting VSC. CONCLUSIONS Apart from Hg2+ and Cu2+, the metals had a significantly greater effect on H2S than on CH3SH. Cu2+ and Hg2+ have well-known antibacterial activity and may presumably also operate by this mechanism.
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Affiliation(s)
- A Young
- Department of Cariology, Faculty of Dentistry, University of Oslo, PO Box 1109 Blindern, N-0317 Oslo, Norway.
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Srivastava SK, Agarwal A, Chauhan PM, Agarwal SK, Bhaduri AP, Singh SN, Fatima N, Chatterjee RK. Potent 1,3-disubstituted-9H-pyrido[3,4-b]indoles as new lead compounds in antifilarial chemotherapy. Bioorg Med Chem 1999; 7:1223-36. [PMID: 10428395 DOI: 10.1016/s0968-0896(99)00050-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [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
Substituted 9H-pyrido[3,4-b]indoles (beta-carbolines) identified in our laboratory as potential pharmacophore for designing macrofilaricidal agents, have been explored further for identifying the pharmacophore responsible for high order of adulticidal activity. This has led to syntheses and macrofilaricidal evaluations of a number of 1-aryl-9H-pyrido[3,4-b]indole-3-carboxylate derivatives (3-7). The macrofilarical activity was initially evaluated in vivo against Acanthoeilonema viteae. Amongst all the synthesized compounds, only twelve compounds namely 3a, 3c, 3d, 3f, 4c, 4d, 4f, 5a, 6f, 6h, 6i and 7h have exhibited either > 90% micro- or macrofilaricidal activity or sterilization of female worms. These compounds have also been screened against Litomosoides carinii and of these only 3f and 5a have also been found to be active. Finally these two compounds have been evaluated against Brugia malayi. The structure activity relationship (SAR) associated with position-1 and 3 substituents in beta-carbolines have been discussed. It has been observed that the presence of carbomethoxy at position-3 and an aryl substituent at position- in beta-carbolines effectively enhance antifilarial activity particularly against A. viteae. Amongst the various compounds screened, methyl 1-(4-methylphenyl)-9H-pyrido[3,4-b]indole-3-carboxylate (4c) has shown highest adulticidal activity and methyl 1-(4-chlorophenyl)-1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indole-3-carboxyla te (3a) has shown highest microfilaricidal action against A. viteae at 50 mg/ kg x 5 days (i.p.). Another derivative of this compound namely 1-(4-chlorophenyl)-3-hydroxymethyl-9H-pyrido[3,4-b]indole (5a) exhibited highest activity against L. carinii at 30 mg/kg x 5 days (i.p.) and against B. malayi at 50 mg/kg x 5 days (i.p.) or at 200 mg/kg x 5 days (p.o.).
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Affiliation(s)
- S K Srivastava
- Division of Medicinal Chemistry, Central Drug Research Institute, Lucknow, India
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Baer RD, Garcia de Alba J, Leal RM, Plascencia Campos AR, Goslin N. Mexican use of lead in the treatment of empacho: community, clinic, and longitudinal patterns. Soc Sci Med 1998; 47:1263-6. [PMID: 9783868 DOI: 10.1016/s0277-9536(98)00183-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [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: 11/21/2022]
Abstract
This paper discusses research designed to investigate community, clinic, and longitudinal patterns in use of lead as a treatment for empacho, a folk illness manifest by gastrointestinal symptoms. The same questionnaire used in a clinic-based study seven years previously in Guadalajara, Mexico, was used to interview a randomly selected community sample: in addition, the study was repeated at the same clinic sites that had been studied previously. The goals were to investigate: (1) What are community wide prevalences of empacho and use of lead based remedies? (2) To what extent are current patterns of use of lead for treatment of empacho in clinic-based samples similar to those seven years ago. The attributable risk to the population as a whole from use of lead based remedies was found to be 11% of the households of Guadalajara. Essentially this same estimate was seen for the 1987 and 1994 clinic populations. Interestingly, while percentages of lead users have declined since 1987, twice as great a percentage of informants reported treating empacho. Other patterns originally identified in 1987 persisted in 1994; lead use continues to be associated with lower levels of parental education and income.
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Affiliation(s)
- R D Baer
- Department of Anthropology, University of South Florida, Tampa 33620, USA
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Begum R, Koshy R, Sengupta A. Effect of homeopathic drugs plumbum and opium on experimentally induced lead toxicity in rats. Indian J Exp Biol 1994; 32:192-5. [PMID: 8070841] [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: 01/28/2023]
Abstract
Homeopathic drugs plumbum 1M and Opium 30 were partially effective in the recovery of delta ALAD activity of the lead (150 mg% lead acetate) intoxicated rats. Plumbum 1M did not exhibit protective effect when dietary lead at high concentrations (> 25 mg% lead acetate) were given concurrently as assessed by blood delta ALAD activity and hemoglobin concentration. However it was partially effective in the recovery of delta ALAD activity and relieving anemia caused by chronic exposure of low doses of lead (below 15 mg% lead acetate).
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Affiliation(s)
- R Begum
- Department of Biochemistry, Faculty of Science, M.S. University of Baroda, India
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22
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Loiseau PM, Craciunescu DG, Doadrio-Villarejo JC, Certad-Fombona G, Gayral P. Pharmacomodulations on new organometallic complexes of Ir, Pt, Rh, Pd, Os: in vitro and in vivo trypanocidal study against Trypanosoma brucei brucei. Trop Med Parasitol 1992; 43:110-4. [PMID: 1519021] [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: 12/27/2022]
Abstract
New organometallic complexes have been synthesized by association of an active organic molecule with a metallic element such as Pt, Rh, Ir, Pd, Os. Their trypanocidal activity was studied in vitro and in vivo against T. b. brucei. The more active compounds were pentamidine derivatives. The Ir- COD-pentamidine complex, and Iridium (I) cationic and organometallic complex showed and in vitro activity at 60 micrograms/l. Moreover, all infected mice were cured by this compound subcutaneously administered in a single dose at 0.5 mg/kg (0.317 mumol/kg). In the same conditions, pentamidine cured all the mice at 5 mumol/kg. Ir-COD-pentamidine (or P1995) was 16 fold more efficient than pentamidine. Since the chemotherapeutic index of this molecule was 7.5 fold higher than those of pentamidine, P1995 can be considered as a potential trypanocidal drug of the future.
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Affiliation(s)
- P M Loiseau
- Biologie et Contrôle des Organismes Parasites, Université Paris-Sud, Châtenay-Malabry, France
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Abstract
This paper discusses research designed to investigate the patterns and consequences of the use of lead based folk remedies in the treatment of some gastrointestinal problems in Mexico. Use of lead is seen in 35% of the population sampled in Guadalajara who treated the folk illness empacho, and 5% of a similar population in Oaxaca. Lead use seems to be associated with mestizo ethnic background, and with lower levels of parental education and income.
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Affiliation(s)
- R D Baer
- Department of Anthropology, University of South Florida, Tampa 33620
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Kurosu S, Ioritani N, Kanbe K, Kageyama S, Kuwahara M, Niwa T, Takayama K. [Extracorporeal renal stone disintegration using chemical explosive pellets. Effects of underwater shock wave on various organs]. Nihon Hinyokika Gakkai Zasshi 1987; 78:1252-9. [PMID: 3682515 DOI: 10.5980/jpnjurol1928.78.7_1252] [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] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Abstract
The use of silver and lead azide explosive charges for the percutaneous distintegration of renal calculi has been investigated. Charges of 10 mg or more reliably reduced calculi to fragments of extractable size; however, the concomitant tissue effects would preclude the use of such charges clinically. Smaller charges require multiple applications. High-speed flash photography demonstrated the unfocussed nature of these discharges. Considerable improvements are anticipated when the shock waves are focused. The use of Nonel tubing is described, and future developments are discussed.
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Leads from the MMWR. Lead poisoning from Mexican folk remedies--California. JAMA 1983; 250:3149. [PMID: 6644995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Pani P, Corongiu FP, Sanna A, Congiu L. Protection by lead nitrate against carbon tetrachloride hepatotoxicity. Drug Metab Dispos 1975; 3:148-54. [PMID: 238813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Pretreatment with lead nitrate of rats intoxicated with CCl4 exerted a significant protective effect against several damaging effects of the haloalkane. Liver microsomal lipid peroxidation, one of the earliest phenomena in CCl4 intoxication, was clearly inhibited by pretreating the rats with lead. The heavy metal also ameliorated the polyribosomal disaggregation caused by CCl4. Fatty infiltration in the liver, measured by the triglyceride content in the organ, was less pronounced in CCl4-poisoned rats pretreated with lead than in animals treated with the haloalkane alone. Lipid metabolism was also studied by means of Triton WR 1339-induced hypertriglyceridemia to examine the state of triglyceride secretion from liver into plasma; the higher level of plasma triglyceride in the lead-pretreated rats further strengthened the results obtained on the secretion experiments. Finally, CCl4-induced liver necrosis, as measured by serum transaminases and histological examination, was partially prevented by lead. The mechanism by which lead, an inhibitor of the drug-metabolizing enzyme system, interferes with CCl4 intoxication, is disccused.
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Bethge JF, Koch G, Kohrt TC, Schlosser GA, Schmieding I. [Experimental acceleration of fracture healing. II. Neutral lead acetate]. Langenbecks Arch Chir 1971; 328:371-81. [PMID: 5147788 DOI: 10.1007/bf01237511] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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30
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Zak VI. [Mechanism of the antigoitrogenic effect of iodine and some metal salts during the use of 6-methylthiouracil]. Biull Eksp Biol Med 1971; 72:51-3. [PMID: 5112561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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31
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Lukas G, Weitgasser H. [New ways of producing ointments with lead salts of fatty acids. 5]. Dermatol Wochenschr 1967; 153:1289-93. [PMID: 5607693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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32
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Burian K. [Experimental calcification in the tracheal wall]. Z Laryngol Rhinol Otol 1967; 46:419-25. [PMID: 5588978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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