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da Silva AF, Farias JR, Franco DCG, Galiza AA, Motta EP, Oliveira ADS, Vasconcelos CC, Cartágenes MDSDS, da Rocha CQ, da Silva MCP, Lopes AJO, do Nascimento FRF, Monteiro CA, Guerra RNM. Anti- Candida albicans Activity of Ononin and Other Secondary Metabolites from Platonia Insignis MART. Metabolites 2022; 12:1014. [PMID: 36355097 PMCID: PMC9696916 DOI: 10.3390/metabo12111014] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/13/2022] [Accepted: 10/19/2022] [Indexed: 12/01/2023] Open
Abstract
Candida albicans is a human pathogen that is part of the healthy microbiome. However, it is often associated with opportunistic fungal infections. The treatment of these infections is challenging because prolonged exposure to antifungal drugs can culminate in fungal resistance during therapy, and there is a limited number of available drugs. Therefore, this study investigated the antifungal activity of ononin by in silico and in vitro assays, and in Tenebrio molitor as an alternative in vivo model of infection caused by C. albicans. Ononin is an isoflavone glycoside derived from formononetin that has various biological activities. According in silico evaluation, ononin showed the best electron affinity in molecular docking with CaCYP51, with a binding free energy of -10.89 kcal/mol, superior to that of the antifungal drugs fluconazole and posaconazole. The ononin + CaCYP51 complex formed hydrogen bonds with Tyr132, Ser378, Phe380, and Met508, as well as hydrophobic connections with Tyr118, Leu121, Phe126, Leu131, Ile304, and Leu309, and interactions with the heme group. Ononin exerted anti-Candida albicans activity, with MIC between 3.9 and 7.8 µg/mL, and inhibited young and mature biofilms, with a reduction in cell density and metabolic activity of 50 to 80%. The compound was not cytotoxic to sheep red blood cells at concentrations up to 1000 µg/mL. Larvae of the mealworm T. molitor were used as an alternative in vivo model of C. albicans infection. Ononin was able to prolong larval survival at concentrations of 0.5, 1, and 5 mg/kg, and was not toxic up to a concentration of 20 mg/kg. Moreover, ononin reduced the fungal charge in treated animals. In conclusion, our results suggest that ononin has anti-Candida albicans activity and is a potential candidate for the development of new therapeutic alternatives.
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Affiliation(s)
- Anderson França da Silva
- Laboratory of Immunophysiolgy, Federal University of Maranhão, São Luís 65080-805, Brazil
- Program in Biotechnology-RENORBIO, Federal University of Maranhão, São Luís 65080-805, Brazil
| | - Josivan Regis Farias
- Laboratory of Immunophysiolgy, Federal University of Maranhão, São Luís 65080-805, Brazil
- Program in Health Sciences, Federal University of Maranhão, São Luís 65080-805, Brazil
| | - Danielle Cristine Gomes Franco
- Laboratory of Immunophysiolgy, Federal University of Maranhão, São Luís 65080-805, Brazil
- Program in Health Sciences, Federal University of Maranhão, São Luís 65080-805, Brazil
| | - Andrea Araruna Galiza
- Laboratory of Immunophysiolgy, Federal University of Maranhão, São Luís 65080-805, Brazil
- Program in Biotechnology-RENORBIO, Federal University of Maranhão, São Luís 65080-805, Brazil
| | - Elizangela Pestana Motta
- Laboratory of Immunophysiolgy, Federal University of Maranhão, São Luís 65080-805, Brazil
- Program in Health Sciences, Federal University of Maranhão, São Luís 65080-805, Brazil
| | - Aluísio da Silva Oliveira
- Laboratory of Immunophysiolgy, Federal University of Maranhão, São Luís 65080-805, Brazil
- Program in Health Sciences, Federal University of Maranhão, São Luís 65080-805, Brazil
| | | | - Maria do Socorro de Sousa Cartágenes
- Program in Health Sciences, Federal University of Maranhão, São Luís 65080-805, Brazil
- Laboratory of Experimental Study of Pain, Department of Physiological Sciences, Federal University of Maranhão, São Luís 65080-805, Brazil
| | | | - Mayara Cristina Pinto da Silva
- Laboratory of Immunophysiolgy, Federal University of Maranhão, São Luís 65080-805, Brazil
- Program in Health Sciences, Federal University of Maranhão, São Luís 65080-805, Brazil
| | - Alberto Jorge Oliveira Lopes
- Federal Institute of Science Education and Technology of Maranhão-Campus Santa Inês, Santa Inês 65300-000, Brazil
| | - Flavia Raquel Fernandes do Nascimento
- Laboratory of Immunophysiolgy, Federal University of Maranhão, São Luís 65080-805, Brazil
- Program in Health Sciences, Federal University of Maranhão, São Luís 65080-805, Brazil
| | - Cristina Andrade Monteiro
- Department of Biology, Federal Institute of Science Education and Technology of Maranhão, São Luís 65030-005, Brazil
| | - Rosane Nassar Meireles Guerra
- Laboratory of Immunophysiolgy, Federal University of Maranhão, São Luís 65080-805, Brazil
- Program in Biotechnology-RENORBIO, Federal University of Maranhão, São Luís 65080-805, Brazil
- Program in Health Sciences, Federal University of Maranhão, São Luís 65080-805, Brazil
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Proposal to Consider Chemical/Physical Microenvironment as a New Therapeutic Off-Target Approach. Pharmaceutics 2022; 14:pharmaceutics14102084. [PMID: 36297518 PMCID: PMC9611316 DOI: 10.3390/pharmaceutics14102084] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/26/2022] [Accepted: 09/28/2022] [Indexed: 11/22/2022] Open
Abstract
The molecular revolution could lead drug discovery from chance observation to the rational design of new classes of drugs that could simultaneously be more effective and less toxic. Unfortunately, we are witnessing some failure in this sense, and the causes of the crisis involve a wide range of epistemological and scientific aspects. In pharmacology, one key point is the crisis of the paradigm the “magic bullet”, which is to design therapies based on specific molecular targets. Drug repurposing is one of the proposed ways out of the crisis and is based on the off-target effects of known drugs. Here, we propose the microenvironment as the ideal place to direct the off-targeting of known drugs. While it has been extensively investigated in tumors, the generation of a harsh microenvironment is also a phenotype of the vast majority of chronic diseases. The hostile microenvironment, on the one hand, reduces the efficacy of both chemical and biological drugs; on the other hand, it dictates a sort of “Darwinian” selection of those cells armed to survive in such hostile conditions. This opens the way to the consideration of the microenvironment as a convenient target for pharmacological action, with a clear example in proton pump inhibitors.
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de Oliveira HC, Castelli RF, Alves LR, Nosanchuk JD, Salama EA, Seleem M, Rodrigues ML. Identification of 4 compounds from the Pharmakon library with antifungal activity against Candida auris and species of Cryptococcus. Med Mycol 2022; 60:6586341. [PMID: 35575621 DOI: 10.1093/mmy/myac033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 04/11/2022] [Accepted: 05/12/2022] [Indexed: 11/14/2022] Open
Abstract
There is an urgent need to develop novel antifungals. In this study, we screened 1600 compounds for antifungal activity against Cryptococcus neoformans and Candida auris. We evaluated 4 promising compounds against 24 additional isolates of C. neoformans, C. auris, Cryptococcus deuterogattii, and Cryptococcus gattii. The 4 compounds, dequalinium chloride (DQC), bleomycin sulfate (BMS), pentamidine isethionate salt (PIS), and clioquinol (CLQ), varied in their efficacy against these pathogens but were generally more effective against cryptococci. The compounds exerted their antifungal effect via multiple mechanisms including interference with the capsule of cryptococci and induction of hyphal-like morphology in C. auris. Our results indicate that DQC, BMS, PIS, and CLQ represent potential prototypes for the future development of antifungals.
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Affiliation(s)
| | - Rafael F Castelli
- Instituto Carlos Chagas, Fundação Oswaldo Cruz (Fiocruz), Curitiba, Brazil.,Programa de Pós-Graduação em Biologia Parasitária, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil
| | - Lysangela R Alves
- Instituto Carlos Chagas, Fundação Oswaldo Cruz (Fiocruz), Curitiba, Brazil
| | - Joshua D Nosanchuk
- Departments of Medicine (Division of Infectious Diseases) and Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, USA
| | - Ehab A Salama
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA, USA
| | - Mohamed Seleem
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA, USA
| | - Marcio L Rodrigues
- Instituto Carlos Chagas, Fundação Oswaldo Cruz (Fiocruz), Curitiba, Brazil.,Instituto de Microbiologia Paulo de Góes (IMPG), Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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Kalimuthu S, Alshanta OA, Krishnamoorthy AL, Pudipeddi A, Solomon AP, McLean W, Leung YY, Ramage G, Neelakantan P. Small molecule based anti-virulence approaches against Candida albicans infections. Crit Rev Microbiol 2022; 48:743-769. [PMID: 35232325 DOI: 10.1080/1040841x.2021.2025337] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Fungi are considered "silent killers" due to the difficulty of, and delays in diagnosis of infections and lack of effective antifungals. This challenge is compounded by the fact that being eukaryotes, fungi share several similarities with human cellular targets, creating obstacles to drug discovery. Candida albicans, a ubiquitous microbe in the human body is well-known for its role as an opportunistic pathogen in immunosuppressed people. Significantly, C. albicans is resistant to all the three classes of antifungals that are currently clinically available. Over the past few years, a paradigm shift has been recommended in the management of C. albicans infections, wherein anti-virulence strategies are considered an alternative to the discovery of new antimycotics. Small molecules, with a molecular weight <900 Daltons, can easily permeate the cell membrane and modulate the signal transduction pathways to elicit desired virulence inhibitory actions against pathogens. This review dissects in-depth, the discoveries that have been made with small-molecule anti-virulence approaches to tackle C. albicans infections.
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Affiliation(s)
| | - Om Alkhir Alshanta
- Glasgow Endodontology Group, Glasgow Dental School, School of Medicine, Dentistry and Nursing, College of Medical, Veterinary and Life Sciences, Glasgow, UK
| | - Akshaya Lakshmi Krishnamoorthy
- Faculty of Dentistry, The University of Hong Kong, Hong Kong, China.,Quorum Sensing Laboratory, Centre for Research in Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed to be University, Thanjavur, India
| | - Akhila Pudipeddi
- Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
| | - Adline Princy Solomon
- Quorum Sensing Laboratory, Centre for Research in Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed to be University, Thanjavur, India
| | - William McLean
- Glasgow Endodontology Group, Glasgow Dental School, School of Medicine, Dentistry and Nursing, College of Medical, Veterinary and Life Sciences, Glasgow, UK
| | - Yiu Yan Leung
- Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
| | - Gordon Ramage
- Glasgow Endodontology Group, Glasgow Dental School, School of Medicine, Dentistry and Nursing, College of Medical, Veterinary and Life Sciences, Glasgow, UK
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Caldara M, Marmiroli N. Antimicrobial Properties of Antidepressants and Antipsychotics-Possibilities and Implications. Pharmaceuticals (Basel) 2021; 14:ph14090915. [PMID: 34577614 PMCID: PMC8470654 DOI: 10.3390/ph14090915] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 09/03/2021] [Accepted: 09/08/2021] [Indexed: 12/13/2022] Open
Abstract
The spreading of antibiotic resistance is responsible annually for over 700,000 deaths worldwide, and the prevision is that this number will increase exponentially. The identification of new antimicrobial treatments is a challenge that requires scientists all over the world to collaborate. Developing new drugs is an extremely long and costly process, but it could be paralleled by drug repositioning. The latter aims at identifying new clinical targets of an “old” drug that has already been tested, approved, and even marketed. This approach is very intriguing as it could reduce costs and speed up approval timelines, since data from preclinical studies and on pharmacokinetics, pharmacodynamics, and toxicity are already available. Antidepressants and antipsychotics have been described to inhibit planktonic and sessile growth of different yeasts and bacteria. The main findings in the field are discussed in this critical review, along with the description of the possible microbial targets of these molecules. Considering their antimicrobial activity, the manuscript highlights important implications that the administration of antidepressants and antipsychotics may have on the gut microbiome.
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Affiliation(s)
- Marina Caldara
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 11/A, 43124 Parma, Italy;
- Interdepartmental Center SITEIA.PARMA, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy
- Correspondence:
| | - Nelson Marmiroli
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 11/A, 43124 Parma, Italy;
- Interdepartmental Center SITEIA.PARMA, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy
- Italian National Interuniversity Consortium for Environmental Sciences (CINSA), University of Parma, 43124 Parma, Italy
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Is SARS-CoV-2 an Etiologic Agent or Predisposing Factor for Oral Lesions in COVID-19 Patients? A Concise Review of Reported Cases in the Literature. Int J Dent 2021; 2021:6648082. [PMID: 34054961 PMCID: PMC8136299 DOI: 10.1155/2021/6648082] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 01/26/2021] [Accepted: 05/04/2021] [Indexed: 12/16/2022] Open
Abstract
The pathogenic mechanism of SARS-CoV-2 infection is unclear, and its symptoms vary in different patients. Initial reports of COVID-19 concentrated on pulmonary issues, but with time, additional features such as hyposmia/anosmia, dysgeusia, and skin lesions were added to the list of COVID-19 symptoms. There have been an increasing number of reports on oral cavity lesions in individuals with COVID-19, which might be relevant considering that this location is one of the first sites coming into contact with the virus and that it contains the SARS-CoV-2 receptor. We hereby aim to familiarize practicing head and neck clinicians with the range of oral lesions reported in COVID-19 patients and to critically appraise the most recent data on the role of SARS-CoV-2 in these lesions. We also discuss the ongoing debate on the direct/indirect association of oral symptoms with the disease. COVID-19 cases with simultaneous oral symptoms were extracted from the literature, and articles discussing the role of SARS-CoV-2 in oral lesions were compiled and methodically analyzed. We found approximately 95 COVID-19 patients with a wide range of oral lesions. Based on current evidence, the exact role of SARS-CoV-2 in the development of oral lesions remains unclear. Oral examination of patients is needed to provide adequate cases for analysis to clarify unknown problems related to COVID-19. There is evidence to support both the direct and indirect roles of SARS-CoV-2 in the development of oral lesions. Awareness of the possibility of oral manifestations in COVID-19 is important to clarify the range of disease signs and symptoms.
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Bapat P, Singh G, Nobile CJ. Visible Lights Combined with Photosensitizing Compounds Are Effective against Candida albicans Biofilms. Microorganisms 2021; 9:microorganisms9030500. [PMID: 33652865 PMCID: PMC7996876 DOI: 10.3390/microorganisms9030500] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Revised: 02/22/2021] [Accepted: 02/24/2021] [Indexed: 12/11/2022] Open
Abstract
Fungal infections are increasing in prevalence worldwide, especially in immunocompromised individuals. Given the emergence of drug-resistant fungi and the fact that there are only three major classes of antifungal drugs available to treat invasive fungal infections, there is a need to develop alternative therapeutic strategies effective against fungal infections. Candida albicans is a commensal of the human microbiota that is also one of the most common fungal pathogens isolated from clinical settings. C. albicans possesses several virulence traits that contribute to its pathogenicity, including the ability to form drug-resistant biofilms, which can make C. albicans infections particularly challenging to treat. Here, we explored red, green, and blue visible lights alone and in combination with common photosensitizing compounds for their efficacies at inhibiting and disrupting C. albicans biofilms. We found that blue light inhibited biofilm formation and disrupted mature biofilms on its own and that the addition of photosensitizing compounds improved its antibiofilm potential. Red and green lights, however, inhibited biofilm formation only in combination with photosensitizing compounds but had no effects on disrupting mature biofilms. Taken together, these results suggest that photodynamic therapy may be an effective non-drug treatment for fungal biofilm infections that is worthy of further exploration.
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Affiliation(s)
- Priyanka Bapat
- Department of Molecular and Cell Biology, School of Natural Science, University of California, Merced, CA 95343, USA; (P.B.); (G.S.)
- Quantitative and Systems Biology Graduate Program, University of California, Merced, CA 95343, USA
| | - Gurbinder Singh
- Department of Molecular and Cell Biology, School of Natural Science, University of California, Merced, CA 95343, USA; (P.B.); (G.S.)
| | - Clarissa J. Nobile
- Department of Molecular and Cell Biology, School of Natural Science, University of California, Merced, CA 95343, USA; (P.B.); (G.S.)
- Health Sciences Research Institute, University of California, Merced, CA 95343, USA
- Correspondence: ; Tel.: +1-209-228-2427
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A Screen for Small Molecules to Target Candida albicans Biofilms. J Fungi (Basel) 2020; 7:jof7010009. [PMID: 33375490 PMCID: PMC7824004 DOI: 10.3390/jof7010009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/18/2020] [Accepted: 12/23/2020] [Indexed: 12/03/2022] Open
Abstract
The human fungal pathogen Candida albicans can form biofilms on biotic and abiotic surfaces, which are inherently resistant to antifungal drugs. We screened the Chembridge Small Molecule Diversity library containing 30,000 “drug-like” small molecules and identified 45 compounds that inhibited biofilm formation. These 45 compounds were then tested for their abilities to disrupt mature biofilms and for combinatorial interactions with fluconazole, amphotericin B, and caspofungin, the three antifungal drugs most commonly prescribed to treat Candida infections. In the end, we identified one compound that moderately disrupted biofilm formation on its own and four compounds that moderately inhibited biofilm formation and/or moderately disrupted mature biofilms only in combination with either caspofungin or fluconazole. No combinatorial interactions were observed between the compounds and amphotericin B. As members of a diversity library, the identified compounds contain “drug-like” chemical backbones, thus even seemingly “weak hits” could represent promising chemical starting points for the development and the optimization of new classes of therapeutics designed to target Candida biofilms.
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Kim JH, Cheng LW, Chan KL, Tam CC, Mahoney N, Friedman M, Shilman MM, Land KM. Antifungal Drug Repurposing. Antibiotics (Basel) 2020; 9:antibiotics9110812. [PMID: 33203147 PMCID: PMC7697925 DOI: 10.3390/antibiotics9110812] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 10/30/2020] [Accepted: 11/13/2020] [Indexed: 12/19/2022] Open
Abstract
Control of fungal pathogens is increasingly problematic due to the limited number of effective drugs available for antifungal therapy. Conventional antifungal drugs could also trigger human cytotoxicity associated with the kidneys and liver, including the generation of reactive oxygen species. Moreover, increased incidences of fungal resistance to the classes of azoles, such as fluconazole, itraconazole, voriconazole, or posaconazole, or echinocandins, including caspofungin, anidulafungin, or micafungin, have been documented. Of note, certain azole fungicides such as propiconazole or tebuconazole that are applied to agricultural fields have the same mechanism of antifungal action as clinical azole drugs. Such long-term application of azole fungicides to crop fields provides environmental selection pressure for the emergence of pan-azole-resistant fungal strains such as Aspergillus fumigatus having TR34/L98H mutations, specifically, a 34 bp insertion into the cytochrome P450 51A (CYP51A) gene promoter region and a leucine-to-histidine substitution at codon 98 of CYP51A. Altogether, the emerging resistance of pathogens to currently available antifungal drugs and insufficiency in the discovery of new therapeutics engender the urgent need for the development of new antifungals and/or alternative therapies for effective control of fungal pathogens. We discuss the current needs for the discovery of new clinical antifungal drugs and the recent drug repurposing endeavors as alternative methods for fungal pathogen control.
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Affiliation(s)
- Jong H. Kim
- Foodborne Toxin Detection and Prevention Research Unit, Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Albany, CA 94710, USA; (L.W.C.); (K.L.C.); (C.C.T.); (N.M.)
- Correspondence: ; Tel.: +1-510-559-5841
| | - Luisa W. Cheng
- Foodborne Toxin Detection and Prevention Research Unit, Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Albany, CA 94710, USA; (L.W.C.); (K.L.C.); (C.C.T.); (N.M.)
| | - Kathleen L. Chan
- Foodborne Toxin Detection and Prevention Research Unit, Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Albany, CA 94710, USA; (L.W.C.); (K.L.C.); (C.C.T.); (N.M.)
| | - Christina C. Tam
- Foodborne Toxin Detection and Prevention Research Unit, Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Albany, CA 94710, USA; (L.W.C.); (K.L.C.); (C.C.T.); (N.M.)
| | - Noreen Mahoney
- Foodborne Toxin Detection and Prevention Research Unit, Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Albany, CA 94710, USA; (L.W.C.); (K.L.C.); (C.C.T.); (N.M.)
| | - Mendel Friedman
- Healthy Processed Foods Research Unit, Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Albany, CA 94710, USA;
| | | | - Kirkwood M. Land
- Department of Biological Sciences, University of the Pacific, Stockton, CA 95211, USA;
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