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Gomaa SE, Abbas HA, Mohamed FA, Ali MAM, Ibrahim TM, Abdel Halim AS, Alghamdi MA, Mansour B, Chaudhary AA, Elkelish A, Boufahja F, Hegazy WAH, Yehia FAZA. The anti-staphylococcal fusidic acid as an efflux pump inhibitor combined with fluconazole against vaginal candidiasis in mouse model. BMC Microbiol 2024; 24:54. [PMID: 38341568 PMCID: PMC10858509 DOI: 10.1186/s12866-024-03181-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 01/04/2024] [Indexed: 02/12/2024] Open
Abstract
BACKGROUND Candida albicans is the most common fungus that causes vaginal candidiasis in immunocompetent women and catastrophic infections in immunocompromised patients. The treatment of such infections is hindered due to the increasing emergence of resistance to azoles in C. albicans. New treatment approaches are needed to combat candidiasis especially in the dwindled supply of new effective and safe antifungals. The resistance to azoles is mainly attributed to export of azoles outside the cells by means of the efflux pump that confers cross resistance to all azoles including fluconazole (FLC). OBJECTIVES This study aimed to investigate the possible efflux pump inhibiting activity of fusidic acid (FA) in C. albicans resistant isolates and the potential use of Fusidic acid in combination with fluconazole to potentiate the antifungal activity of fluconazole to restore its activity in the resistant C. albicans isolates. METHODS The resistance of C. albicans isolates was assessed by determination of minimum inhibitory concentration. The effect of Fusidic acid at sub-inhibitory concentration on efflux activity was assayed by rhodamine 6G efflux assay and intracellular accumulation. Mice model studies were conducted to evaluate the anti-efflux activity of Fusidic acid and its synergistic effects in combination with fluconazole. Impact of Fusidic acid on ergosterol biosynthesis was quantified. The synergy of fluconazole when combined with Fusidic acid was investigated by determination of minimum inhibitory concentration. The cytotoxicity of Fusidic acid was tested against erythrocytes. The effect of Fusidic acid on efflux pumps was tested at the molecular level by real-time PCR and in silico study. In vivo vulvovaginitis mice model was used to confirm the activity of the combination in treating vulvovaginal candidiasis. RESULTS Fusidic acid showed efflux inhibiting activity as it increased the accumulation of rhodamine 6G, a substrate for ABC-efflux transporter, and decreased its efflux in C. albicans cells. The antifungal activity of fluconazole was synergized when combined with Fusidic acid. Fusidic acid exerted only minimal cytotoxicity on human erythrocytes indicating its safety. The FA efflux inhibitory activity could be owed to its ability to interfere with efflux protein transporters as revealed by docking studies and downregulation of the efflux-encoding genes of both ABC transporters and MFS superfamily. Moreover, in vivo mice model showed that using fluconazole-fusidic acid combination by vaginal route enhanced fluconazole antifungal activity as shown by lowered fungal burden and a negligible histopathological change in vaginal tissue. CONCLUSION The current findings highlight FA's potential as a potential adjuvant to FLC in the treatment of vulvovaginal candidiasis.
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Affiliation(s)
- Salwa E Gomaa
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Zagazig, 44519, Egypt
| | - Hisham A Abbas
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Zagazig, 44519, Egypt
| | - Fatma A Mohamed
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Zagazig, 44519, Egypt
- Department of Medical Microbiology and Immunology-Medical School, University of Pécs, Szigeti Út 12, Pécs, H-7624, Hungary
| | - Mohamed A M Ali
- Department of Biology, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 11623, Saudi Arabia
- Department of Biochemistry, Faculty of Science, Ain Shams University, Abbassia, Cairo, 11566, Egypt
| | - Tarek M Ibrahim
- Department of Pharmaceutics, Faculty of Pharmacy, Zagazig University, Zagazig, 44519, Egypt
| | - Alyaa S Abdel Halim
- Department of Biochemistry, Faculty of Science, Ain Shams University, Abbassia, Cairo, 11566, Egypt
| | - Mashael A Alghamdi
- Department of Chemistry, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 11623, Saudi Arabia
| | - Basem Mansour
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Belqas, 11152, Egypt
| | - Anis Ahmad Chaudhary
- Department of Biology, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 11623, Saudi Arabia
| | - Amr Elkelish
- Department of Biology, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 11623, Saudi Arabia
- Department of Botany and Microbiology, Faculty of Science, Suez Canal University, Ismailia, 41522, Egypt
| | - Fehmi Boufahja
- Department of Biology, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 11623, Saudi Arabia
| | - Wael A H Hegazy
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Zagazig, 44519, Egypt.
- Pharmacy Program, Department of Pharmaceutical Sciences, Oman College of Health Sciences, Muscat, 113, Oman.
| | - Fatma Al-Zahraa A Yehia
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Zagazig, 44519, Egypt
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Bava R, Castagna F, Ruga S, Nucera S, Caminiti R, Serra M, Bulotta RM, Lupia C, Marrelli M, Conforti F, Statti G, Domenico B, Palma E. Plants and Their Derivatives as Promising Therapeutics for Sustainable Control of Honeybee ( Apis mellifera) Pathogens. Pathogens 2023; 12:1260. [PMID: 37887776 PMCID: PMC10610010 DOI: 10.3390/pathogens12101260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/08/2023] [Accepted: 10/18/2023] [Indexed: 10/28/2023] Open
Abstract
The most important pollinator for agricultural crops is the Western honeybee (Apis mellifera). During the winter and summer seasons, diseases and stresses of various kinds endanger honeybee numbers and production, resulting in expenses for beekeepers and detrimental effects on agriculture and ecosystems. Researchers are continually in search of therapies for honeybees using the resources of microbiology, molecular biology, and chemistry to combat diseases and improve the overall health of these important pollinating insects. Among the most investigated and most promising solutions are medicinal plants and their derivatives. The health of animals and their ability to fight disease can be supported by natural products (NPs) derived from living organisms such as plants and microbes. NPs contain substances that can reduce the effects of diseases by promoting immunity or directly suppressing pathogens, and parasites. This literature review summarises the advances that the scientific community has achieved over the years regarding veterinary treatments in beekeeping through the use of NPs. Their impact on the prevention and control of honeybee diseases is investigated both in trials that have been conducted in the laboratory and field studies.
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Affiliation(s)
- Roberto Bava
- Department of Health Sciences, University of Catanzaro Magna Græcia, 88100 Catanzaro, Italy; (R.B.); (S.R.); (S.N.); (R.C.); (M.S.); (R.M.B.); (B.D.); (E.P.)
| | - Fabio Castagna
- Department of Health Sciences, University of Catanzaro Magna Græcia, 88100 Catanzaro, Italy; (R.B.); (S.R.); (S.N.); (R.C.); (M.S.); (R.M.B.); (B.D.); (E.P.)
| | - Stefano Ruga
- Department of Health Sciences, University of Catanzaro Magna Græcia, 88100 Catanzaro, Italy; (R.B.); (S.R.); (S.N.); (R.C.); (M.S.); (R.M.B.); (B.D.); (E.P.)
| | - Saverio Nucera
- Department of Health Sciences, University of Catanzaro Magna Græcia, 88100 Catanzaro, Italy; (R.B.); (S.R.); (S.N.); (R.C.); (M.S.); (R.M.B.); (B.D.); (E.P.)
| | - Rosamaria Caminiti
- Department of Health Sciences, University of Catanzaro Magna Græcia, 88100 Catanzaro, Italy; (R.B.); (S.R.); (S.N.); (R.C.); (M.S.); (R.M.B.); (B.D.); (E.P.)
| | - Maria Serra
- Department of Health Sciences, University of Catanzaro Magna Græcia, 88100 Catanzaro, Italy; (R.B.); (S.R.); (S.N.); (R.C.); (M.S.); (R.M.B.); (B.D.); (E.P.)
| | - Rosa Maria Bulotta
- Department of Health Sciences, University of Catanzaro Magna Græcia, 88100 Catanzaro, Italy; (R.B.); (S.R.); (S.N.); (R.C.); (M.S.); (R.M.B.); (B.D.); (E.P.)
| | - Carmine Lupia
- Mediterranean Ethnobotanical Conservatory, Sersale (CZ), 88054 Catanzaro, Italy;
- National Ethnobotanical Conservatory, Castelluccio Superiore, 85040 Potenza, Italy
| | - Mariangela Marrelli
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende, 87036 Cosenza, Italy; (M.M.); (F.C.); (G.S.)
| | - Filomena Conforti
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende, 87036 Cosenza, Italy; (M.M.); (F.C.); (G.S.)
| | - Giancarlo Statti
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Rende, 87036 Cosenza, Italy; (M.M.); (F.C.); (G.S.)
| | - Britti Domenico
- Department of Health Sciences, University of Catanzaro Magna Græcia, 88100 Catanzaro, Italy; (R.B.); (S.R.); (S.N.); (R.C.); (M.S.); (R.M.B.); (B.D.); (E.P.)
| | - Ernesto Palma
- Department of Health Sciences, University of Catanzaro Magna Græcia, 88100 Catanzaro, Italy; (R.B.); (S.R.); (S.N.); (R.C.); (M.S.); (R.M.B.); (B.D.); (E.P.)
- Department of Health Sciences, Institute of Research for Food Safety & Health (IRC-FISH), University of Catanzaro Magna Græcia, 88100 Catanzaro, Italy
- Nutramed S.c.a.r.l., Complesso Ninì Barbieri, Roccelletta di Borgia, 88021 Catanzaro, Italy
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Zapata-Zapata C, Rojas-López M, García LT, Quintero W, Terrón MC, Luque D, Mesa-Arango AC. Lippia origanoides Essential Oil or Thymol in Combination with Fluconazole Produces Damage to Cells and Reverses the Azole-Resistant Phenotype of a Candida tropicalis Strain. J Fungi (Basel) 2023; 9:888. [PMID: 37754996 PMCID: PMC10532872 DOI: 10.3390/jof9090888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 08/23/2023] [Accepted: 08/24/2023] [Indexed: 09/28/2023] Open
Abstract
Candida tropicalis is one of the most pathogenic species within the genus. Increased antifungal resistance has been reported, which is in part due to the organism's ability to form biofilms. In natural products derived from plants, such as essential oils (EOs) or their major components, there is significant potential to develop new antifungals or to both enhance the efficacy and reduce the toxicity of conventional antifungals. This study aimed to evaluate the effect of combining an EO of Lippia origanoides or thymol with fluconazole on an azole-resistant C. tropicalis strain. Synergism was observed in the combination of fluconazole with the EO and with thymol, and minimal inhibitory concentrations for fluconazole decreased at least 32-fold. As a consequence of the synergistic interactions, mitochondrial membrane potential was reduced, and mitochondrial superoxide production increased. Alteration in nuclear morphology, cell surface, and ultrastructure was also observed. In conclusion, the synergistic interaction between L. origanoides EO or thymol with fluconazole reverted the azole-resistant C. tropicalis phenotype. These findings suggest that L. origanoides EO or thymol alone, or in combination with fluconazole, have the potential for development as antifungal therapies for this yeast, including resistant strains.
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Affiliation(s)
- Carolina Zapata-Zapata
- Academic Group of Epidemiology, Faculty of Medicine, University of Antioquia, Medellín 050010, Colombia;
| | - Mauricio Rojas-López
- Group of Cellular Immunology and Immunogenetics (GICIG), Faculty of Medicine, University of Antioquia, Medellín 050010, Colombia;
- Flow Cytometry Unit, University of Antioquia, Medellín 050010, Colombia
| | - Liliana T. García
- Postgraduate Department of Infectious Disease, University of Santander, Bucaramanga 680006, Colombia; (L.T.G.); (W.Q.)
| | - Wendy Quintero
- Postgraduate Department of Infectious Disease, University of Santander, Bucaramanga 680006, Colombia; (L.T.G.); (W.Q.)
| | - María C. Terrón
- Electron Microscopy Unit, Scientific-Technical Central Units, Institute of Health Carlos III (ISCIII), 28220 Madrid, Spain; (M.C.T.); (D.L.)
| | - Daniel Luque
- Electron Microscopy Unit, Scientific-Technical Central Units, Institute of Health Carlos III (ISCIII), 28220 Madrid, Spain; (M.C.T.); (D.L.)
| | - Ana C. Mesa-Arango
- Academic Group of Epidemiology, Faculty of Medicine, University of Antioquia, Medellín 050010, Colombia;
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Noel D, Hallsworth JE, Gelhaye E, Darnet S, Sormani R, Morel-Rouhier M. Modes-of-action of antifungal compounds: Stressors and (target-site-specific) toxins, toxicants, or Toxin-stressors. Microb Biotechnol 2023. [PMID: 37191200 DOI: 10.1111/1751-7915.14242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 02/11/2023] [Accepted: 02/16/2023] [Indexed: 05/17/2023] Open
Abstract
Fungi and antifungal compounds are relevant to the United Nation's Sustainable Development Goals. However, the modes-of-action of antifungals-whether they are naturally occurring substances or anthropogenic fungicides-are often unknown or are misallocated in terms of their mechanistic category. Here, we consider the most effective approaches to identifying whether antifungal substances are cellular stressors, toxins/toxicants (that are target-site-specific), or have a hybrid mode-of-action as Toxin-stressors (that induce cellular stress yet are target-site-specific). This newly described 'toxin-stressor' category includes some photosensitisers that target the cell membrane and, once activated by light or ultraviolet radiation, cause oxidative damage. We provide a glossary of terms and a diagrammatic representation of diverse types of stressors, toxic substances, and Toxin-stressors, a classification that is pertinent to inhibitory substances not only for fungi but for all types of cellular life. A decision-tree approach can also be used to help differentiate toxic substances from cellular stressors (Curr Opin Biotechnol 2015 33: 228-259). For compounds that target specific sites in the cell, we evaluate the relative merits of using metabolite analyses, chemical genetics, chemoproteomics, transcriptomics, and the target-based drug-discovery approach (based on that used in pharmaceutical research), focusing on both ascomycete models and the less-studied basidiomycete fungi. Chemical genetic methods to elucidate modes-of-action currently have limited application for fungi where molecular tools are not yet available; we discuss ways to circumvent this bottleneck. We also discuss ecologically commonplace scenarios in which multiple substances act to limit the functionality of the fungal cell and a number of as-yet-unresolved questions about the modes-of-action of antifungal compounds pertaining to the Sustainable Development Goals.
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Affiliation(s)
| | - John E Hallsworth
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, UK
| | - Eric Gelhaye
- Université de Lorraine, INRAE, IAM, Nancy, France
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Li-Zhulanov NS, Zaikova NP, Sari S, Gülmez D, Sabuncuoğlu S, Ozadali-Sari K, Arikan-Akdagli S, Nefedov AA, Rybalova TV, Volcho KP, Salakhutdinov NF. Rational Design of New Monoterpene-Containing Azoles and Their Antifungal Activity. Antibiotics (Basel) 2023; 12:antibiotics12050818. [PMID: 37237723 DOI: 10.3390/antibiotics12050818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 04/24/2023] [Accepted: 04/25/2023] [Indexed: 05/28/2023] Open
Abstract
Azole antifungals, including fluconazole, have long been the first-line antifungal agents in the fight against fungal infections. The emergence of drug-resistant strains and the associated increase in mortality from systemic mycoses has prompted the development of new agents based on azoles. We reported a synthesis of novel monoterpene-containing azoles with high antifungal activity and low cytotoxicity. These hybrids demonstrated broad-spectrum activity against all tested fungal strains, with excellent minimum inhibitory concentration (MIC) values against both fluconazole-susceptible and fluconazole-resistant strains of Candida spp. Compounds 10a and 10c with cuminyl and pinenyl fragments demonstrated up to 100 times lower MICs than fluconazole against clinical isolates. The results indicated that the monoterpene-containing azoles had much lower MICs against fluconazole-resistant clinical isolates of Candida parapsilosis than their phenyl-containing counterpart. In addition, the compounds did not exhibit cytotoxicity at active concentrations in the MTT assay, indicating potential for further development as antifungal agents.
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Affiliation(s)
- Nikolai S Li-Zhulanov
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Lavrentiev Ave., 9, 630090 Novosibirsk, Russia
| | - Nadezhda P Zaikova
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Lavrentiev Ave., 9, 630090 Novosibirsk, Russia
| | - Suat Sari
- Department of Pharmaceutical Chemistry, Hacettepe University Faculty of Pharmacy, Sihhiye, Ankara 06100, Turkey
| | - Dolunay Gülmez
- Department of Medical Microbiology, Hacettepe University Faculty of Medicine, Sihhiye, Ankara 06100, Turkey
| | - Suna Sabuncuoğlu
- Department of Pharmaceutical Toxicology, Hacettepe University Faculty of Pharmacy, Sihhiye, Ankara 06100, Turkey
| | - Keriman Ozadali-Sari
- Department of Pharmaceutical Chemistry, Hacettepe University Faculty of Pharmacy, Sihhiye, Ankara 06100, Turkey
| | - Sevtap Arikan-Akdagli
- Department of Medical Microbiology, Hacettepe University Faculty of Medicine, Sihhiye, Ankara 06100, Turkey
| | - Andrey A Nefedov
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Lavrentiev Ave., 9, 630090 Novosibirsk, Russia
| | - Tatyana V Rybalova
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Lavrentiev Ave., 9, 630090 Novosibirsk, Russia
| | - Konstantin P Volcho
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Lavrentiev Ave., 9, 630090 Novosibirsk, Russia
| | - Nariman F Salakhutdinov
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Lavrentiev Ave., 9, 630090 Novosibirsk, Russia
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Oremefetse D, Aijaz A, Sanelisiwe D, Mrudula P. Survival of Candida auris on environmental surface material and low-level resistance to disinfectant. J Hosp Infect 2023:S0195-6701(23)00120-2. [PMID: 37116661 DOI: 10.1016/j.jhin.2023.04.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 03/30/2023] [Accepted: 04/16/2023] [Indexed: 04/30/2023]
Abstract
BACKGROUND Candida auris persist in the environment despite disinfection. The survival on various environmental surfaces and the effect of sub-lethal concentrations of disinfectants on C. auris has not been studied. AIM This study investigated the survival of C. auris on environmental surfaces and the effect of sub-inhibitory concentrations of disinfectants. METHODS Surface material blocks were fabricated, artificially contaminated with C. auris, and for 3 weeks viable counts were assessed. In addition, C. auris cells were pulsed daily with disinfectants for 15 days and MICs were determined. Ergosterol quantities and efflux pump assays were also performed on disinfectant exposed strains using standard methods. RESULTS C. auris survived on all the surfaces for more than 3 weeks with the lowest count of 2.3 log cfu regardless of wet and dry conditions. Wet wood supported growth of C. auris with a one log increase in contrast to the dry condition which inhibited this organism (both p <0.01). In the biofilm form, C. auris flourished on all the surfaces. Although the MICs increased in sodium dichloroisocyanurate and benzalkonium chloride pulsed C. auris cells, only the benzalkonium chloride exposed cells showed decreased ergosterol content and an activated efflux pump. CONCLUSIONS Although C. auris survived on all the tested surfaces, survival on wet wood was remarkable. Benzalkonium chloride pulsed C. auris developed some degree of tolerance to disinfectant and showed efflux pump activation, suggesting the development of low-level resistance.
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Affiliation(s)
- Dire Oremefetse
- Department of Clinical Microbiology and Infectious Diseases, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, South Africa
| | - Ahmad Aijaz
- Department of Clinical Microbiology and Infectious Diseases, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, South Africa; Infection Control, Charlotte Maxeke Johannesburg Academic Hospital National Health Laboratory Service, South Africa
| | - Duze Sanelisiwe
- Department of Clinical Microbiology and Infectious Diseases, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, South Africa
| | - Patel Mrudula
- Department of Clinical Microbiology and Infectious Diseases, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, South Africa; Infection Control, Charlotte Maxeke Johannesburg Academic Hospital National Health Laboratory Service, South Africa.
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Reversal of Azole Resistance in Candida albicans by Human Neutrophil Peptide. Biomedicines 2023; 11:biomedicines11020513. [PMID: 36831048 PMCID: PMC9953362 DOI: 10.3390/biomedicines11020513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 02/01/2023] [Accepted: 02/08/2023] [Indexed: 02/12/2023] Open
Abstract
With the spread of AIDS and the increase in immunocompromised patients, multi-drug-resistant fungal infections have become a serious concern among clinicians, predominantly in the developing world. Therefore, developing novel strategies and new drugs is essential to overcome drug resistance in fungal pathogens. Antimicrobial peptides of human origin have been investigated as a potential treatment against Candida infections. In this study, human neutrophil peptide (HNP) was tested for its antifungal activity alone and in combination with fluconazole (FLC) against azole-susceptible and resistant C. albicans isolates, following CLSI guidelines. Susceptibility and combination interactions were also confirmed by MUSE cell viability assay and isobolograms for synergistic combinations, respectively. The effect of HNP on biofilm inhibition was determined spectrophotometrically and microscopically. Drug susceptibility testing showed minimum inhibitory concentrations (MICs) and minimum fungicidal concentrations (MFCs) ranging from 7.813 to 62.5 µg/mL and 15.625 to 250 µg/mL against all the tested C. albicans strains. The combination activity of FLC with HNP exhibited synergistic and additive interactions in 43% of each and indifferent interaction in 14%, and none of the combinations showed antagonistic interaction. Furthermore, HNB inhibited biofilm formation in all the tested C. albicans isolates. At the respective MICs, HNP exhibited inhibitory effects on the activity of the drug efflux pumps and their genes. These results warrant the application of HNP as a mono- or combination therapy with FLC to treat azole-resistant C. albicans.
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Ohiienko T, Kutsyk R, Kurovets L, Ohiienko S, Pyuryk Y. SCREENING OF MEDICINAL AND AROMATIC PLANTS EXTRACTS FOR THE SYNERGISM WITH FLUCONAZOLE AGAINST CANDIDA ALBICANS AND CANDIDA TROPICALIS FUNGI ASSOCIATED WITH DENTURE STOMATITIS. WIADOMOSCI LEKARSKIE (WARSAW, POLAND : 1960) 2023; 76:1615-1620. [PMID: 37622505 DOI: 10.36740/wlek202307115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/26/2023]
Abstract
OBJECTIVE The aim: To conduct a primary screening of the ability of aqueous-ethanol extracts of medicinal plants to enhance the effect of fluconazole against resistant strains of Candida sp. associated with denture stomatitis, to justify the potential use of combined antifungal therapy. PATIENTS AND METHODS Materials and methods: 40 biochemical tests using the VITEK 2 system with the use of VITEK 2 YST ID card (Biomerieux, France). The computer programs UTHSCSA ImageTool 2.0 and Microsoft Office Excel 2003 were used for statistical processing of the results. RESULTS Results: 114 extracts out of 166 studied ones (68.7 « 0.28%) showed direct antifungal activity in relation to C. tropicalis strain, 74 extracts (44.6 « 0.30%) turned out to be highly active (d IZ > 10 mm). Only 50 extracts out of 166 studied ones (30.1 « 0.28%) showed antifungal activity against C. albicans strain, 26 extracts (15.7 « 0.22%) were highly active (d IZ > 10 mm). Significant direct antifungal activity both against C. albicans strain and C. tropicalis strain was demonstrated by the extracts of the leaves of Sophora japonica, thallus of Mnium cuspidatum Hedw. (M.silvaticum Lindb.), herbs of Euphorbia amygdaloides L., Lathyrus niger (L.) Bernh., Betonica officinalis L. s. l., flowers of Primula officinalis Hill., roots of Scrophularia nodosa L. CONCLUSION Conclusions: 1. Aqueous-ethanolic extracts of medicinal and aromatic plants of Ukrainian flora have direct antifungal activity against azole resistant C. albicans and C. tropicalis (44,6«0,30% and 15,7«0,22% of tested extracts respectively) associated with denture stomatitis as well restore their sensitivity to fluconazole (44,6«0,30% and 15,7«0,22% of extracts respectively).
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Affiliation(s)
- Tetiana Ohiienko
- IVANO-FRANKIVSK NATIONAL MEDICAL UNIVERSITY, IVANO-FRANKIVSK, UKRAINE
| | - Roman Kutsyk
- IVANO-FRANKIVSK NATIONAL MEDICAL UNIVERSITY, IVANO-FRANKIVSK, UKRAINE
| | - Lesia Kurovets
- IVANO-FRANKIVSK NATIONAL MEDICAL UNIVERSITY, IVANO-FRANKIVSK, UKRAINE
| | | | - Yaroslav Pyuryk
- IVANO-FRANKIVSK NATIONAL MEDICAL UNIVERSITY, IVANO-FRANKIVSK, UKRAINE
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Characterization of Defensin-like Protein 1 for Its Anti-Biofilm and Anti-Virulence Properties for the Development of Novel Antifungal Drug against Candida auris. J Fungi (Basel) 2022; 8:jof8121298. [PMID: 36547631 PMCID: PMC9786216 DOI: 10.3390/jof8121298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/07/2022] [Accepted: 12/09/2022] [Indexed: 12/23/2022] Open
Abstract
Candida auris has emerged as a pan-resistant pathogenic yeast among immunocompromised patients worldwide. As this pathogen is involved in biofilm-associated infections with serious medical manifestations due to the collective expression of pathogenic attributes and factors associated with drug resistance, successful treatment becomes a major concern. In the present study, we investigated the candidicidal activity of a plant defensin peptide named defensin-like protein 1 (D-lp1) against twenty-five clinical strains of C. auris. Furthermore, following the standard protocols, the D-lp1 was analyzed for its anti-biofilm and anti-virulence properties. The impact of these peptides on membrane integrity was also evaluated. For cytotoxicity determination, a hemolytic assay was conducted using horse blood. The minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) values ranged from 0.047-0.78 mg/mL and 0.095-1.56 mg/mL, respectively. D-lp1 at sub-inhibitory concentrations potentially abrogated both biofilm formation and 24-h mature biofilms. Similarly, the peptide severely impacted virulence attributes in the clinical strain of C. auris. For the insight mechanism, D-lp1 displayed a strong impact on the cell membrane integrity of the test pathogen. It is important to note that D-lp1 at sub-inhibitory concentrations displayed minimal hemolytic activity against horse blood cells. Therefore, it is highly useful to correlate the anti-Candida property of D-lp1 along with anti-biofilm and anti-virulent properties against C. auris, with the aim of discovering an alternative strategy for combating serious biofilm-associated infections caused by C. auris.
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Antifungal Activity of Lavandula angustifolia Essential Oil against Candida albicans: Time-Kill Study on Pediatric Sputum Isolates. Molecules 2022; 27:molecules27196300. [PMID: 36234837 PMCID: PMC9571381 DOI: 10.3390/molecules27196300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 09/14/2022] [Accepted: 09/20/2022] [Indexed: 11/17/2022] Open
Abstract
The aim of our study was to determine the susceptibility of 15 Candida albicans sputum isolates on fluconazole and caspofungin, as well as the antifungal potential of Lavandula angustifolia essential oil (LAEO). The commercial LAEO was analyzed using gas chromatography-mass spectrometry. The antifungal activity was evaluated using EUCAST protocol. A killing assay was performed to evaluate kinetics of 2% LAEO within 30 min treatment. LAEO with major constituents’ linalool (33.4%) and linalyl acetate (30.5%) effective inhibited grows of C. albicans in concentration range 0.5–2%. Fluconazole activity was noted in 67% of the isolates with MICs in range 0.06–1 µg/mL. Surprisingly, 40% of isolates were non-wild-type (non-WT), while MICs for WT ranged between 0.125–0.25 µg/mL. There were no significant differences in the LAEO MICs among fluconazole-resistant and fluconazole-susceptible sputum strains (p = 0.31) and neither among caspofungin non-WT and WT isolates (p = 0.79). The 2% LAEO rapidly achieved 50% growth reduction in all tested strains between 0.2 and 3.5 min. Within 30 min, the same LAEO concentration exhibited a 99.9% reduction in 27% isolates. This study demonstrated that 2% solution of LAEO showed a significant antifungal activity which is equally effective against fluconazole and caspofungin susceptible and less-susceptible strains.
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Combining Essential Oils with Each Other and with Clotrimazole Prevents the Formation of Candida Biofilms and Eradicates Mature Biofilms. Pharmaceutics 2022; 14:pharmaceutics14091872. [PMID: 36145621 PMCID: PMC9503487 DOI: 10.3390/pharmaceutics14091872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 08/25/2022] [Accepted: 08/29/2022] [Indexed: 11/17/2022] Open
Abstract
Fungal infections by Candida spp. are opportunistic and most often occur in individuals with some predisposing factor. Essential oils (EO) have anti-Candida potential, being a therapeutic alternative to be explored, especially for superficial and mucosal candidiasis. The objective was to analyze the synergistic potential between the EO of Citrus limon, Cupressus sempervirens, Litsea cubeba and Melaleuca alternifolia, and each of them with clotrimazole, to inhibit in vitro the formation and eradication of Candida spp. biofilms. Added to this, the survival of Caenorhabditis elegans was evaluated after exposure to EO, clotrimazole and their synergistic combinations. Anti-Candida activity was determined by microdilution for the substances alone and in EO−EO and EO−clotrimazole combinations. The combinations were performed by the checkerboard method, and the reduction in the metabolic activity of biofilms was determined by the viability of MTT/menadione. C. elegans larvae survival was evaluated after 24 h of exposure to EO, clotrimazole and synergistic combinations. The minimum inhibitory concentration (MIC) of EO ranged from 500 to >4000 µg/mL. The lowest MIC (500 µg/mL) was for C. sempervirens and L. cubeba on a C. krusei isolate; for clotrimazole, the MIC ranged from 0.015 to 0.5 µg/mL. Biofilm inhibition and eradication both ranged from 1000 to >4000 µg/mL. The lethal concentration (LC50) of C. limon, L. cubeba and M. alternifolia was 2000 µg/mL for C. elegans, while for C. sempervirens and clotrimazole, it was not determined within the concentration limits tested. In combination, more than 85% of the larvae survived M. alternifolia−clotrimazole, M. alternifolia−L. cubeba, C. sempervirens−clotrimazole and C. sempervirens−C. limon combinations. This study is the first, to our knowledge, to present a synergistic relationship of EO−EO and EO−clotrimazole combinations on Candida spp. biofilms.
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Augmenting Azoles with Drug Synergy to Expand the Antifungal Toolbox. Pharmaceuticals (Basel) 2022; 15:ph15040482. [PMID: 35455479 PMCID: PMC9027798 DOI: 10.3390/ph15040482] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 03/25/2022] [Accepted: 03/26/2022] [Indexed: 12/23/2022] Open
Abstract
Fungal infections impact the lives of at least 12 million people every year, killing over 1.5 million. Wide-spread use of fungicides and prophylactic antifungal therapy have driven resistance in many serious fungal pathogens, and there is an urgent need to expand the current antifungal arsenal. Recent research has focused on improving azoles, our most successful class of antifungals, by looking for synergistic interactions with secondary compounds. Synergists can co-operate with azoles by targeting steps in related pathways, or they may act on mechanisms related to resistance such as active efflux or on totally disparate pathways or processes. A variety of sources of potential synergists have been explored, including pre-existing antimicrobials, pharmaceuticals approved for other uses, bioactive natural compounds and phytochemicals, and novel synthetic compounds. Synergy can successfully widen the antifungal spectrum, decrease inhibitory dosages, reduce toxicity, and prevent the development of resistance. This review highlights the diversity of mechanisms that have been exploited for the purposes of azole synergy and demonstrates that synergy remains a promising approach for meeting the urgent need for novel antifungal strategies.
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Daniela SV, Gabriela OM, Andrea PM. A state-of-the-art review and prospective therapeutic applications of prenyl flavonoids as chemosensitizers against antifungal multidrug resistance in Candida albicans. Curr Med Chem 2022; 29:4251-4281. [PMID: 35139777 DOI: 10.2174/0929867329666220209103538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 12/01/2021] [Accepted: 12/17/2021] [Indexed: 11/22/2022]
Abstract
Multidrug resistance (MDR) in the opportunistic pathogen Candida albicans is defined as non-susceptibility to at least one agent in two or more drug classes. This phenomenon has been increasingly reported since the rise in the incidence of fungal infections in immunocompromised patients at the end of the last century. After the discovery of efflux pump overexpression as a principal mechanism causing MDR in Candida strains, drug discovery targeting fungal efflux transporters has had a growing impact. Chemosensitization aims to enhance azole intracellular concentrations through combination therapy with transporter inhibitors. Consequently, the use of drug efflux inhibitors combined with the antifungal agent will sensitize the pathogen. As a result, the use of lower drug concentrations will reduce possible adverse effects on the host. Through an extensive revision of the literature, this review aims to provide an exhaustive and critical analysis of the studies carried out in the past two decades, regarding the chemosensitization strategy to cope with multidrug resistance in C. albicans. This work provides a deep analysis of the research about the inhibition of drug-efflux membrane transporters by prenylated flavonoids and the interactions of these phytocompounds with azole antifungals as an approach to chemosensitize multidrug-resistant C. albicans strains. We highlight the importance of prenylflavonoids and their particular chemical and pharmacological characteristics that make them excellent candidates with therapeutic potential as chemosensitizers. Finally, we propose the need for further research of prenyl flavonoids as inhibitors of drug-efflux mediated fungal resistance.
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Affiliation(s)
- Santi V Daniela
- Farmacognosia, Departamento de Ciencias Farmacéuticas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Haya de la torre y Medina Allende, Edificio Ciencias II, X5000HUA Córdoba, Argentina
- Instituto Multidisciplinario de Biología Vegetal (IMBIV-CONICET), Ciudad Universitaria. X5000HUA Córdoba, Argentina
| | - Ortega María Gabriela
- Farmacognosia, Departamento de Ciencias Farmacéuticas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Haya de la torre y Medina Allende, Edificio Ciencias II, X5000HUA Córdoba, Argentina
- Instituto Multidisciplinario de Biología Vegetal (IMBIV-CONICET), Ciudad Universitaria. X5000HUA Córdoba, Argentina
| | - Peralta Mariana Andrea
- Farmacognosia, Departamento de Ciencias Farmacéuticas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Haya de la torre y Medina Allende, Edificio Ciencias II, X5000HUA Córdoba, Argentina
- Instituto Multidisciplinario de Biología Vegetal (IMBIV-CONICET), Ciudad Universitaria. X5000HUA Córdoba, Argentina
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Ahmad A, Elisha IL, van Vuuren S, Viljoen A. Volatile phenolics: A comprehensive review of the anti-infective properties of an important class of essential oil constituents. PHYTOCHEMISTRY 2021; 190:112864. [PMID: 34311279 DOI: 10.1016/j.phytochem.2021.112864] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 06/23/2021] [Accepted: 06/28/2021] [Indexed: 06/13/2023]
Abstract
Historically, essential oils and their lead molecules have been extensively recognised for their anti-infective properties. In this context, certain volatile phenolics (VPs) have emerged as important antimicrobial compounds with excellent inhibitory activity against pathogenic bacteria and fungi, which further extends to drug-resistant and biofilm-forming micro-organisms. In this review, we aim to collate and discuss a number of published papers on the anti-infective activities of naturally occurring VPs with special emphasis on eugenol, isoeugenol, thymol and carvacrol, using Scopus Web of Science and PubMed databases. The biosynthesis and extraction of these VPs are discussed, while particular attention is given to their broad-spectrum antimicrobial activity and the mechanisms of action. We highlight combinational studies of the VPs with other phytocompounds and with commercially available drugs, which may be a promising and a rewarding future approach to combat antimicrobial resistance. These VPs alone, or concomitantly with other compounds or drugs, have the potential to be incorporated into different formulations for biomedical applications. An in-depth assessment of 2310 articles retrieved from the Scopus database spanning a 35-year period indicated 23.1% increase in global publication growth in VPs anti-infective research, with authors from Italy, Portugal and Austria dominating the research landscape. The dominant areas of investigations are identified as antimicrobial activity, antibacterial mechanism of action, antifungal mechanism of action, extraction methods and phytochemistry, use in the food industry, and for oral and dental anti-infective activity. Specific research areas, which require future attention include; antituberculosis research, nanoparticle formulation of antimicrobial active VP molecules, preclinical and clinical trials. The antimicrobial testing of isoeugenol was found to be the least studied of the VPs and this requires further attention.
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Affiliation(s)
- Aijaz Ahmad
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; Clinical Microbiology and Infectious Diseases, Faculty of Health Sciences, School of Pathology, University of Witwatersrand, Johannesburg, South Africa.
| | - Ishaku Leo Elisha
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; Drug Development Section, Biochemistry Division, National Veterinary Research Institute, P.M.B. 01 Vom, Plateau State, Nigeria.
| | - Sandy van Vuuren
- Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, 2193, South Africa.
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; SAMRC Herbal Drugs Research Unit, Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa.
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Soulaimani B, Varoni E, Iriti M, Mezrioui NE, Hassani L, Abbad A. Synergistic Anticandidal Effects of Six Essential Oils in Combination with Fluconazole or Amphotericin B against Four Clinically Isolated Candida Strains. Antibiotics (Basel) 2021; 10:antibiotics10091049. [PMID: 34572630 PMCID: PMC8470676 DOI: 10.3390/antibiotics10091049] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 08/22/2021] [Accepted: 08/25/2021] [Indexed: 11/24/2022] Open
Abstract
The development of opportunistic pathogenic Candida strains insensitive to several classes of antifungals has emerged as a major health care problem during the last years. Combinational therapy of natural products (e.g., essential oils, EOs) with conventional antifungals has been suggested as a promising alternative to overcome this medical problem. The present study investigates the potential antifungal activity of EOs extracted from some selected medicinal plants, alone and in combination with two common conventional antifungals (fluconazole and amphotericin B) against four clinical Candida isolates. MIC assays indicated that EOs induced strong anticandidal activities with MIC values ranging from 0.162 to 4.950 mg/mL. The combination of amphotericin B with Thymus leptobotrys, Origanum compactum and Artemisia herba alba EOs provided a synergistic effect against C. krusei only, with MIC gain of four-fold, and additive effect against remaining strains (MIC gain = two-fold). Interesting synergistic interactions were observed by combining all studied EOs with fluconazole, with reduction rates of their MICs ranging from 16 to 512-fold. This synergistic effect was very pronounced with the combination of T. leptobotrys EO and fluconazole. These findings indicate that studied EOs can be used as anti-candidals in combination with antifungals, particularly fluconazole, to counteract the emergence of resistant Candida spp.
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Affiliation(s)
- Bouchra Soulaimani
- Laboratory of Microbiology and Biotechnology, Agrosciences and Environment, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech 40000, Morocco; (B.S.); (N.-E.M.); (L.H.); (A.A.)
| | - Elena Varoni
- Department of Biomedical, Surgical and Dental Sciences, Università degli Studi di Milano, 20142 Milan, Italy;
| | - Marcello Iriti
- Department of Agricultural and Environmental Sciences, Università degli Studi di Milano, 20133 Milan, Italy
- Correspondence: ; Tel.: +39-02-50316766
| | - Nour-Eddine Mezrioui
- Laboratory of Microbiology and Biotechnology, Agrosciences and Environment, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech 40000, Morocco; (B.S.); (N.-E.M.); (L.H.); (A.A.)
| | - Lahcen Hassani
- Laboratory of Microbiology and Biotechnology, Agrosciences and Environment, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech 40000, Morocco; (B.S.); (N.-E.M.); (L.H.); (A.A.)
| | - Abdelaziz Abbad
- Laboratory of Microbiology and Biotechnology, Agrosciences and Environment, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech 40000, Morocco; (B.S.); (N.-E.M.); (L.H.); (A.A.)
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Pyrogallol and Fluconazole Interact Synergistically In Vitro against Candida glabrata through an Efflux-Associated Mechanism. Antimicrob Agents Chemother 2021; 65:e0010021. [PMID: 33875436 PMCID: PMC8373228 DOI: 10.1128/aac.00100-21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Candida glabrata is currently the first or second most commonly encountered non-albicans Candida species worldwide. The potential severity of Candida resistance mandates the discovery of novel antifungal agents, including those that can be used in combination therapies. In this study, we evaluated the in vitro interactions of pyrogallol (PG) and azole drugs against 22 clinical C. glabrata isolates. The potential mechanism underlying the synergism between PG and fluconazole (FLC) was investigated by the rhodamine 6G efflux method and quantitative reverse transcription (qRT)-PCR analysis. In susceptibility tests, PG showed strong synergism with FLC, itraconazole (ITC), and voriconazole (VRC), with fractional inhibitory concentration index values of 0.18 to 0.375 for PG+FLC, 0.250 to 0.750 for PG+ITC, and 0.141 to 0.750 for PG+VRC. Cells grown in the presence of PG+FLC exhibited reduced rhodamine 6G extrusion and significantly downregulated expression of the efflux-related genes CgCDR1, CgCDR2, and CgPDR1 compared with cells grown in the presence of PG or FLC alone. PG did not potentiate FLC when tested against a ΔCgpdr1 strain. Restoration of a functional CgPDR1 allele also restored the synergism. These results indicate that PG is an antifungal agent that synergistically potentiates the activity of azoles. Furthermore, PG appears to exert its effects by inhibiting efflux pumps and downregulating CgCDR1, CgCDR2, and CgPDR1, with CgPDR1 probably playing a crucial role in this process.
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Venturini TP, Rossato L, Chassot F, De Azevedo MI, Al-Hatmi AMS, Santurio JM, Alves SH. Activity of cinnamaldehyde, carvacrol and thymol combined with antifungal agents against Fusarium spp. JOURNAL OF ESSENTIAL OIL RESEARCH 2021. [DOI: 10.1080/10412905.2021.1923580] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Tarcieli Pozzebon Venturini
- Postgraduate Program in Pharmaceutical Sciences, Health Sciences Center, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Luana Rossato
- Postgraduate Program in Pharmaceutical Sciences, Health Sciences Center, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Francieli Chassot
- Postgraduate Program in Pharmaceutical Sciences, Health Sciences Center, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Maria Isabel De Azevedo
- Department of Preventive Veterinary Medicine, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | | | - Janio Morais Santurio
- Department of Preventive Veterinary Medicine, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
- Postgraduate Program in Pharmacology, Health Sciences Center, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Sydney Hartz Alves
- Postgraduate Program in Pharmaceutical Sciences, Health Sciences Center, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
- Department of Preventive Veterinary Medicine, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
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Kamli MR, Srivastava V, Hajrah NH, Sabir JSM, Ali A, Malik MA, Ahmad A. Phytogenic Fabrication of Ag-Fe Bimetallic Nanoparticles for Cell Cycle Arrest and Apoptosis Signaling Pathways in Candida auris by Generating Oxidative Stress. Antioxidants (Basel) 2021; 10:182. [PMID: 33513888 PMCID: PMC7910930 DOI: 10.3390/antiox10020182] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 01/17/2021] [Accepted: 01/20/2021] [Indexed: 02/05/2023] Open
Abstract
Novel green synthetic nanomedicines have been recognized as alternative therapies with the potential to be antifungal agents. Apoptosis induction, cell cycle arrest and activation of the antioxidant defense system in fungal cells have also gained attention as emerging drug targets. In this study, a facile and biodegradable synthetic route was developed to prepare Ag-Fe bimetallic nanoparticles using aqueous extract of Beta vulgaris L. Surface plasmon resonance of Beta vulgaris-assisted AgNPs nanoparticles was not observed in the UV-visible region of Ag-Fe bimetallic NPs, which confirms the formation of Ag-Fe nanoparticles. Beta vulgaris-assisted Ag-Fe NPs were characterized by FTIR spectroscopy, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction and TGA-DTG analysis for their structural and morphological properties. The as-prepared Ag-Fe NPs were well dispersed and spherical with the average particle size of 15 nm. The antifungal activity of these Ag-Fe NPs against clinical isolates of Candida auris was determined by broth microdilution and cell viability assays. For insights into mechanisms, induction of apoptosis and triggering cell cycle arrest were studied following standard protocols. Furthermore, analysis of antioxidant defense enzymes was determined spectrophotometrically. Antifungal susceptibility results revealed high antifungal activity with MIC values ranging from 0.19 to 0.39 µg/mL. Further studies showed that Ag-Fe NPs were able to induce apoptosis, cell cycle arrest in G2/M phase and disturbances in primary and secondary antioxidant enzymes. This study presents the potential of Ag-Fe NPs to inhibit and potentially eradicate C. auris by inducing apoptosis, cell cycle arrest and increased levels of oxidative stress.
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Affiliation(s)
- Majid Rasool Kamli
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
- Center of Excellence in Bionanoscience Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Vartika Srivastava
- Clinical Microbiology and Infectious Diseases, Faculty of Health Sciences, School of Pathology, University of the Witwatersrand, Johannesburg 2193, South Africa
| | - Nahid H Hajrah
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - Jamal S M Sabir
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
- Center of Excellence in Bionanoscience Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Arif Ali
- Department of Biosciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Maqsood Ahmad Malik
- Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - Aijaz Ahmad
- Clinical Microbiology and Infectious Diseases, Faculty of Health Sciences, School of Pathology, University of the Witwatersrand, Johannesburg 2193, South Africa
- Infection Control Unit, Charlotte Maxeke Johannesburg Academic Hospital, National Health Laboratory Service, Johannesburg 2193, South Africa
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Camphor and Eucalyptol-Anticandidal Spectrum, Antivirulence Effect, Efflux Pumps Interference and Cytotoxicity. Int J Mol Sci 2021; 22:ijms22020483. [PMID: 33418931 PMCID: PMC7825113 DOI: 10.3390/ijms22020483] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 12/31/2020] [Accepted: 01/04/2021] [Indexed: 12/27/2022] Open
Abstract
Candidaalbicans represents one of the most common fungal pathogens. Due to its increasing incidence and the poor efficacy of available antifungals, finding novel antifungal molecules is of great importance. Camphor and eucalyptol are bioactive terpenoid plant constituents and their antifungal properties have been explored previously. In this study, we examined their ability to inhibit the growth of different Candida species in suspension and biofilm, to block hyphal transition along with their impact on genes encoding for efflux pumps (CDR1 and CDR2), ergosterol biosynthesis (ERG11), and cytotoxicity to primary liver cells. Camphor showed excellent antifungal activity with a minimal inhibitory concentration of 0.125-0.35 mg/mL while eucalyptol was active in the range of 2-23 mg/mL. The results showed camphor's potential to reduce fungal virulence traits, that is, biofilm establishment and hyphae formation. On the other hand, camphor and eucalyptol treatments upregulated CDR1;CDR2 was positively regulated after eucalyptol application while camphor downregulated it. Neither had an impact on ERG11 expression. The beneficial antifungal activities of camphor were achieved with an amount that was non-toxic to porcine liver cells, making it a promising antifungal compound for future development. The antifungal concentration of eucalyptol caused cytotoxic effects and increased expression of efflux pump genes, which suggests that it is an unsuitable antifungal candidate.
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Leal ALAB, Bezerra CF, Confortin C, da Silva LE, Marinho EM, Marinho MM, Vasconcelos MA, da Silva TG, Marinho ES, Teixeira AMR, Coutinho HDM, Barreto HM, Dos Santos HS. Chemical composition and potentiating action of Norfloxacin mediated by the essential oil of Piper caldense C.D.C. against Staphylococcus aureus strains overexpressing efflux pump genes. Arch Microbiol 2021; 203:4727-4736. [PMID: 34052872 PMCID: PMC8164493 DOI: 10.1007/s00203-021-02393-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Revised: 05/14/2021] [Accepted: 05/20/2021] [Indexed: 02/08/2023]
Abstract
Infectious diseases caused by multidrug-resistant microorganisms has increased in the last years. Piper species have been reported as a natural source of phytochemicals that can help in combating fungal and bacterial infections. This study had as objectives characterize the chemical composition of the essential oil from Piper caldense (EOPC), evaluate its potential antimicrobial activity, and investigate the synergistic effect with Norfloxacin against multidrug-resistant S. aureus overproducing efflux pumps, as well as, verify the EOPC ability to inhibit the Candida albicans filamentation. EOPC was extracted by hydrodistillation, and the chemical constituents were identified by gas chromatography, allowing the identification of 24 compounds (91.9%) classified as hydrocarbon sesquiterpenes (49.6%) and oxygenated sesquiterpenes (39.5%). Antimicrobial tests were performed using a 96-well plate microdilution method against C. albicans ATCC 10231, Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 25923 standard strains, as well as against multidrug-resistant strains S. aureus SA1199B (overexpressing norA gene), S. aureus K2068 (overexpressing mepA gene) and S. aureus K4100 (overexpressing qacC gene). The oil showed activity against C. albicans ATCC 10231 (≥ 512 µg/mL) and was able to inhibit hyphae formation, an important mechanism of virulence of C. albicans. On the other hand, EOPC was inactive against all bacterial strains tested (≤ 1,024 µg mL). However, when combined with Norfloxacin at subinhibitory concentration EOPC reduced the Norfloxacin and Ethidium bromide MIC values against S. aureus strains SA1199B, K2068 and K4100. These results indicate that EOPC is a source of phytochemicals acting as NorA, MepA and QacC inhibitors.
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Affiliation(s)
- Antonio Linkoln Alves Borges Leal
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
- Department of Microbiology and Parasitolog, Federal University of Piaui, Teresina, PI, Brazil
| | - Camila Fonseca Bezerra
- Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, PE, Brazil
| | - Camila Confortin
- Postgraduate Programme in Sustainable Territorial, Federal University of Paraná, Curitiba, PR, Brazil
| | - Luiz Everson da Silva
- Postgraduate Programme in Sustainable Territorial, Federal University of Paraná, Curitiba, PR, Brazil
| | - Emanuelle Machado Marinho
- Department of Analytical Chemistry and Physical Chemistry, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Márcia Machado Marinho
- Faculty of Education, Science and Letters of Iguatu, State University of Ceará, Iguatu, CE, Brazil
| | | | - Terezinha Gonçalves da Silva
- Department of Antibiotics, Drug Planning and Synthesis Laboratory-LPSF, Federal University of Pernambuco, Cidade Universitária, Recife, PE, Brazil
| | - Emmanuel Silva Marinho
- Group of Theoretical Chemistry and Electrochemistry, State University of Ceará, Campus FAFIDAM, Limoeiro do Norte, Fortaleza, CE, Brazil
| | | | | | | | - Hélcio Silva Dos Santos
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil.
- Center for Exact Sciences and Technology, Vale do Acarau State University, Sobral, CE, Brazil.
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Preservative Efficacy of Essential Oils Against Postharvested Fungi and Insects of Food Commodities – A Prospect to Go Green. Fungal Biol 2021. [DOI: 10.1007/978-3-030-68260-6_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Antifungal Activity of Thai Cajuput Oil and Its Effect on Efflux-Pump Gene Expression in Fluconazole-Resistant Candida albicans Clinical Isolates. Int J Microbiol 2020; 2020:5989206. [PMID: 33488720 PMCID: PMC7803126 DOI: 10.1155/2020/5989206] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 07/30/2020] [Accepted: 10/25/2020] [Indexed: 01/30/2023] Open
Abstract
Candidiasis caused by the fluconazole-resistant opportunistic pathogen Candida albicans is an intractable clinical problem that threatens immunocompromised or normal individuals. The most common mechanism of fluconazole resistance in C. albicans is the failure of cells to accumulate the drug due to increased expression of the efflux proteins encoded by the CDR1, CDR2, and MDR1 genes. Because the number of current antifungal drugs is limited, it is necessary to develop new therapeutic strategies. This study aimed to evaluate the antifungal activity of Thai Cajuput oil, its synergism with fluconazole, and its effect on efflux-pump gene expression in fluconazole-resistant C. albicans clinical isolates. Thus, we first detected the efflux-pump genes in fourteen resistant strains by PCR. The frequencies of the CDR1, CDR2, and MDR1 genes were 68.75%, 62.5%, and 87.5%, respectively, and these efflux-pump genes were distributed in three distinct patterns. Subsequently, the antifungal activity of Thai Cajuput oil was assessed by broth macrodilution and its synergism with fluconazole was evaluated by the checkerboard assay. The changes in the expression levels of CDR1, CDR2, and MDR1 after treatment with Thai Cajuput oil were analyzed by qRT-PCR. The MICs and MFCs of Thai Cajuput oil ranged from 0.31 to 1.25 μl/ml and 0.63 to 1.25 μl/ml, respectively, and its activity was defined as fungicidal activity. The MICs of the combination of Thai Cajuput oil and fluconazole were much lower than the MICs of the individual drugs. Interestingly, sub-MICs of Thai Cajuput oil significantly reduced the MDR1 expression level in resistant strains (P < 0.05). Our study suggests that Thai Cajuput oil can be used to create new potential combination therapies to combat the antifungal resistance of C. albicans.
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Scariot FJ, Foresti L, Delamare APL, Echeverrigaray APLS. Activity of monoterpenoids on the in vitro growth of two Colletotrichum species and the mode of action on C. acutatum. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2020; 170:104698. [PMID: 32980053 DOI: 10.1016/j.pestbp.2020.104698] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 08/28/2020] [Accepted: 08/30/2020] [Indexed: 06/11/2023]
Abstract
Essential oils and their main compounds, monoterpenoids, are considered as alternative control systems for phytopathogenic fungi, particularly those related to late diseases of fruits and vegetables, like anthracnose caused by Colletotrichum species. In this context, we studied the effect of twenty monoterpenoids on Colletotrichum fructicola and C. acutatum to elucidate their effectiveness and mechanisms of action. Thus, we analyzed mycelial growth and conidial inhibitory concentration, as well as the effect of selected monoterpenoids on membrane integrity and cell vitality, reactive oxygen species (ROS) accumulation, and mitochondrial membrane potential by flow cytometry. The results showed that oxygenated monoterpenoids (alcohols and aldehydes) exhibited higher antifungal activity than their corresponding hydrocarbons, esters, and cyclic counterparts. Indicating that OH- and O- radicals react with cellular components affecting fungal homeostasis. In this sense, selected monoterpenoids (citral, citronellol, geraniol, carvacrol, and thymol) inhibited conidial germination of C. acutatum in a dose-dependent manner. The inhibition of conidial germination is associated with a loss of membrane integrity, a decrease of cell metabolism, and a dose-dependent accumulation of ROS, which was non-directly associated with modifications on mitochondrial membrane potential. Membrane dysfunction and ROS accumulation may be responsible for the necrotic behavior induced by high monoterpenoids concentrations, and possible apoptotic response in sub dosages of these compounds.
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Affiliation(s)
- Fernando J Scariot
- Institute of Biotechnology, University of Caxias do Sul, Rio Grande do Sul, Brazil.
| | - Luciano Foresti
- Institute of Biotechnology, University of Caxias do Sul, Rio Grande do Sul, Brazil
| | - Ana Paula L Delamare
- Institute of Biotechnology, University of Caxias do Sul, Rio Grande do Sul, Brazil
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Boren K, Crown A, Carlson R. Multidrug and Pan-Antibiotic Resistance—The Role of Antimicrobial and Synergistic Essential Oils: A Review. Nat Prod Commun 2020. [DOI: 10.1177/1934578x20962595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Bacterial resistance to antibiotics continues to be a grave threat to human health. Because antibiotics are no longer a lucrative market for pharmaceutical companies, the development of new antibiotics has slowed to a crawl. The World Health Organization reported that the 8 new bacterial agents approved since July 2017 had limited clinical benefits. While a cohort of biopharmaceutical companies recently announced plans to develop 2-4 new antibiotics by 2030, we needn’t wait a decade to find innovative antibiotic candidates. Essential oils (EOs) have long been known as antibacterial agents with wide-ranging arsenals. Many are able to penetrate the bacterial membrane and may also be effective against bacterial defenses such as biofilms, efflux pumps, and quorum sensing. EOs have been documented to fight drug-resistant bacteria alone and/or combined with antibiotics. This review will summarize research showing the significant role of EOs as nonconventional regimens against the worldwide spread of antibiotic-resistant pathogens. The authors conducted a 4-year search of the US National Library of Medicine (PubMed) for relevant EO studies against methicillin-resistant Staphylococcus aureus, multidrug-resistant (MDR) Escherichia coli, EO combinations/synergy with antibiotics, against MDR fungal infections, showing the ability to permeate bacterial membranes, and against the bacterial defenses listed above. EOs are readily available and are a needed addition to the arsenal against resistant pathogens.
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25
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Dube Y, Khan A, Marimani M, Ahmad A. Lactobacillus rhamnosus cell-free extract targets virulence and antifungal drug resistance in Candida albicans. Can J Microbiol 2020; 66:733-747. [PMID: 32777192 DOI: 10.1139/cjm-2019-0491] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Candidiasis caused by multidrug-resistant Candida species continues to be difficult to eradicate. The use of live probiotic bacteria has gained a lot of interest in the treatment of candidiasis; however, whole-cell probiotic use can often be associated with a high risk of sepsis. Strategies manipulating cell-free methods using probiotic strains could lead to the development of novel antifungal solutions. Therefore, we evaluated the effect of three probiotic cell-free extracts (CFEs) on the growth, virulence traits, and drug efflux pumps in C. albicans. On the basis of its minimum inhibitory concentration, Lactobacillus rhamnosus was selected and assessed against various virulence traits and drug resistance mechanisms. The results showed that L. rhamnosus CFE significantly inhibited hyphae formation and reduced secretion of proteinases and phospholipases. Moreover, L. rhamnosus inhibited the drug efflux proteins in resistant C. albicans strains thus reversing drug resistance. Gene expression data confirmed downregulation of genes associated with microbial virulence and drug resistance following treatment of C. albicans with L. rhamnosus CFE. Through gas chromatography - mass spectrometry chemical characterization, high contents of oleic acid (24.82%) and myristic acid (13.11%) were observed in this CFE. Collectively, our findings indicate that L. rhamnosus may potentially be used for therapeutic purposes to inhibit C. albicans infections.
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Affiliation(s)
- Yvonne Dube
- Department of Clinical Microbiology and Infectious Diseases, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, South Africa
| | - Amber Khan
- Department of Internal Medicine, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, South Africa
| | - Musa Marimani
- Department of Clinical Microbiology and Infectious Diseases, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, South Africa
| | - Aijaz Ahmad
- Department of Clinical Microbiology and Infectious Diseases, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, South Africa.,Infection Control, Charlotte Maxeke Johannesburg Academic Hospital National Health Laboratory Service, South Africa
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The Sensitivity Modifying Activity of Nerolidol and α-Bisabolol Against Trichophyton spp. Indian J Microbiol 2020; 60:505-510. [PMID: 33088000 DOI: 10.1007/s12088-020-00895-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 06/03/2020] [Indexed: 12/28/2022] Open
Abstract
Trichophyton spp. is one of the main causative agents of dermatophytosis such as tinea ungium and tinea pedis. Resistance to antifungal drugs is a significant clinical problem in dermatophytosis. The main molecular mechanism of antifungal resistance to conventional therapy in dermatophytes is the expression of efflux pumps. Efforts aimed at improving the efficacy of current antifungals such as griseofulvin are relevant. Given this, sesquiterpenes such as α-bisabolol and nerolidol found in essential oils represent promissing alternatives. Griseofulvin sensitivity modulation activity in T. rubrum, T. interdigitale H6, and T. interdigitale Δmdr2 (mutant strain of T. interdigitale) promoted by α-bisabolol and nerolidol were investigated. The minimum inhibitory concentration (MIC) of the test drugs were determined by microdilution. Subsequently, the effect of the drugs tested on plasma membrane functionality (K+ release) was analyzed. The MIC of griseofulvin was determined at sub-inhibitory sesquiterpene concentrations (modulation assay). An association study was performed with griseofulvin and sesquiterpenes (checkerboard). α-bisabolol was more potent than nerolidol; presenting lower MIC values. All of the fungi were sensitive to griseofulvin, starting at 8 µg/mL. With the exception of griseofulvin, all of the test drugs increased K+ release (p < 0.05). Nerolidol modulated the sensitivity of all strains to griseofulvin; α-bisabolol sensitivity modulation was limited to T. interdigitale H6 and T. interdigitale Δmdr2. In association with griseofulvin: nerolidol and α-bisabolol respectively presented synergism and additivity. Finally, the results of our study suggest using α-bisabolol and nerolidol compounds as potential antifungal agents and griseofulvin sensitivity modulators for Trichophyton spp.
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Sharma A, Biharee A, Kumar A, Jaitak V. Antimicrobial Terpenoids as a Potential Substitute in Overcoming Antimicrobial Resistance. Curr Drug Targets 2020; 21:1476-1494. [PMID: 32433003 DOI: 10.2174/1389450121666200520103427] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 04/17/2020] [Accepted: 04/21/2020] [Indexed: 11/22/2022]
Abstract
There was a golden era where everyone thought that microbes can no longer establish threat to humans but the time has come where microbes are proposing strong resistance against the majority of antimicrobials. Over the years, the inappropriate use and easy availability of antimicrobials have made antimicrobial resistance (AMR) to emerge as the world's third leading cause of death. Microorganisms over the time span have acquired resistance through various mechanisms such as efflux pump, transfer through plasmids causing mutation, changing antimicrobial site of action, or modifying the antimicrobial which will lead to become AMR as the main cause of death worldwide by 2030. In order to overcome the emerging resistance against majority of antimicrobials, there is a need to uncover drugs from plants because they have proved to be effective antimicrobials due to the presence of secondary metabolites such as terpenoids. Terpenoids abundant in nature are produced in response to microbial attack have huge potential against various microorganisms through diverse mechanisms such as membrane disruption, anti-quorum sensing, inhibition of protein synthesis and ATP. New approaches like combination therapy of terpenoids and antimicrobials have increased the potency of treatment against various multidrug resistant microorganisms by showing synergism to each other.
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Affiliation(s)
- Aditi Sharma
- Laboratory of Natural Products, Department of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Bathinda, Punjab-151001, India
| | - Avadh Biharee
- Laboratory of Natural Products, Department of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Bathinda, Punjab-151001, India
| | - Amit Kumar
- Laboratory of Natural Products, Department of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Bathinda, Punjab-151001, India
| | - Vikas Jaitak
- Laboratory of Natural Products, Department of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Bathinda, Punjab-151001, India
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Abrogation of pathogenic attributes in drug resistant Candida auris strains by farnesol. PLoS One 2020; 15:e0233102. [PMID: 32392266 PMCID: PMC7213696 DOI: 10.1371/journal.pone.0233102] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 04/28/2020] [Indexed: 12/13/2022] Open
Abstract
Candida auris, a decade old Candida species, has been identified globally as a significant nosocomial multidrug resistant (MDR) pathogen responsible for causing invasive outbreaks. Biofilms and overexpression of efflux pumps such as Major Facilitator Superfamily and ATP Binding Cassette are known to cause multidrug resistance in Candida species, including C. auris. Therefore, targeting these factors may prove an effective approach to combat MDR in C. auris. In this study, 25 clinical isolates of C. auris from different hospitals of South Africa were used. All the isolates were found capable enough to form biofilms on 96-well flat bottom microtiter plate that was further confirmed by MTT reduction assay. In addition, these strains have active drug efflux mechanism which was supported by rhodamine-6-G extracellular efflux and intracellular accumulation assays. Antifungal susceptibility profile of all the isolates against commonly used drugs was determined following CLSI recommended guidelines. We further studied the role of farnesol, an endogenous quorum sensing molecule, in modulating development of biofilms and drug efflux in C. auris. The MIC for planktonic cells ranged from 62.5–125 mM, and for sessile cells was 125 mM (4h biofilm) and 500 mM (12h and 24h biofilm). Furthermore, farnesol (125 mM) also suppresses adherence and biofilm formation by C. auris. Farnesol inhibited biofilm formation, blocked efflux pumps and downregulated biofilm- and efflux pump- associated genes. Modulation of C. auris biofilm formation and efflux pump activity by farnesol represent a promising approach for controlling life threatening infections caused by this pathogen.
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Singh S, Fatima Z, Hameed S. Octyl gallate reduces ABC multidrug transporter CaCdr1p expression and leads to its mislocalisation in azole-resistant clinical isolates of Candida albicans. J Glob Antimicrob Resist 2020; 22:497-503. [PMID: 32344123 DOI: 10.1016/j.jgar.2020.04.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 01/29/2020] [Accepted: 04/13/2020] [Indexed: 01/19/2023] Open
Abstract
OBJECTIVES Fungal pathogens pose a serious threat to public health. Widespread and prolonged use of antifungal drugs has led to the development of multidrug resistance in the human fungal pathogen Candida albicans. Among several mechanisms leading to drug resistance in C. albicans, overexpression of drug efflux transporters remains by far the leading cause of multidrug resistance, facilitated by overexpression of ATP-binding cassette (ABC) and major facilitator superfamily (MFS) transporters. Hence, targeting efflux pumps still represents a promising approach to combat multidrug resistance. In this study, the effect of octyl gallate (OG), a natural food additive, on drug efflux pump activity of C. albicans was analysed. METHODS Drug efflux pump activity was determined by rhodamine 6G (R6G) efflux and Nile red accumulation assay in a Candida drug resistance protein 1 (CaCdr1p)-overexpressing strain. Gene expression and protein expression and localisation were studied by RT-PCR, Western blot and confocal microscopy. Ergosterol content was measured by the alcoholic KOH method. RESULTS OG specifically inhibits the activity of CaCdr1p, belonging to the ABC superfamily. The underlying mechanism was confirmed as competitive mode of inhibition by OG as revealed by Lineweaver-Burk plot. Furthermore, OG leads to reduced expression of CDR1 and CaCdr1p and mislocalisation of CaCdr1p. Additionally, OG sensitises azole-susceptible and -resistant clinical matched-pair isolates Gu4 & Gu5 and leads to impeded R6G efflux and depleted ergosterol content. CONCLUSION The ability of OG as a potent inhibitor of CaCdr1p that chemosensitises drug-resistant C. albicans warrants further studies to be exploited as an effective antifungal agent.
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Affiliation(s)
- Shweta Singh
- Amity Institute of Biotechnology, Amity University Haryana, Manesar, Gurugram 122413, India
| | - Zeeshan Fatima
- Amity Institute of Biotechnology, Amity University Haryana, Manesar, Gurugram 122413, India.
| | - Saif Hameed
- Amity Institute of Biotechnology, Amity University Haryana, Manesar, Gurugram 122413, India.
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Vanillin confers antifungal drug synergism in Candida albicans by impeding CaCdr2p driven efflux. J Mycol Med 2020; 30:100921. [PMID: 31937429 DOI: 10.1016/j.mycmed.2019.100921] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 11/21/2019] [Accepted: 12/30/2019] [Indexed: 11/21/2022]
Abstract
AIM Among the most common mechanisms of multidrug resistance (MDR) in prevalent human fungal pathogen, Candida albicans, overexpression of drug efflux pumps remains the predominant mechanism. Hence to inhibit efflux pumps and chemosensitize C. albicans against traditional antifungal drugs still represents an attractive approach. The present study aimed to analyze the effect of Vanillin (Van), a natural food flavoring agent, on drug efflux pump activity of Candida albicans. METHODS AND RESULTS We observed that Van specifically inhibits Candida drug resistance protein 2 (CaCdr2p) activity belonging to ATP Binding Cassette (ABC) superfamily as revealed by abrogated rhodamine 6G efflux and nile red accumulation assay with CaCdr2p over expressing strain. Insight studies into the mechanisms suggested that abrogated efflux by CaCdr2p is due to competitive mode of inhibition by Van as depicted by Lineweaver-Burk plot. RT-PCR, western blot and confocal microscopy further unraveled that Van leads to reduced expression of CDR2 and CaCdr2p mislocalization respectively. Furthermore, Van sensitizes the azole sensitive and resistant clinical matched pair of isolates Gu4/Gu5 and led to abrogated rhodamine 6G efflux and depleted ergosterol. Furthermore, Van synergizes with membrane targeting drugs fluconazole and amphotericin B as their fractional inhibitory coefficient index was less than 0.5. CONCLUSION Van being a potent inhibitor of CaCdr2p and chemosensitizing of drug resistant C. albicans warrants further studies to be exploited as effective antifungal agent.
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Gong Y, Li S, Wang W, Li Y, Ma W, Sun S. In vitro and in vivo activity of chelerythrine against Candida albicans and underlying mechanisms. Future Microbiol 2019; 14:1545-1557. [PMID: 31992072 DOI: 10.2217/fmb-2019-0178] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Aim: To evaluate whether chelerythrine (CHT) exhibited antifungal activity against Candida albicans in vitro and in vivo and to explore the underlying mechanisms. Materials & methods: Broth microdilution assay and Galleria mellonella model were used to evaluate the antifungal effect in vitro and in vivo, respectively. Mechanism studies were investigated by morphogenesis observation, Fluo-3/AM, DCFH-DA and rhodamine6G assay, respectively. Results: CHT exhibited antifungal activity against C. albicans and preformed biofilms with minimum inhibitory concentrations ranged from 2 to 16 μg/ml. Besides, CHT protected G. mellonella larvae infected by C. albicans. Mechanisms studies revealed that CHT inhibited hyphal growth, increased intracellular calcium concentration, induced accumulation of reactive oxygen species and inhibited drug transporter activity. Conclusion: CHT exhibited antifungal activity against C. albicans.
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Affiliation(s)
- Ying Gong
- Department of Pharmacy, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, 250012, PR China
- Department of Pharmacy, WuXi People’s Hospital Affiliated with Nanjing Medical University, Wuxi, 214023, PR China
| | - Siwen Li
- Department of Pharmacy, Shandong Provincial Qianfoshan Hospital, The First Hospital Affiliated with Shandong First Medical University, Jinan, 250014, PR China
| | - Weixin Wang
- Department of Pharmacy, Taishan Hospital of Shandong Province, Taian, 271000, PR China
| | - Yiman Li
- School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, PR China
| | - Wenli Ma
- School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, PR China
- Department of Pharmacy, Feicheng Mining Central Hospital, Feicheng 271608, PR China
| | - Shujuan Sun
- Department of Pharmacy, Shandong Provincial Qianfoshan Hospital, The First Hospital Affiliated with Shandong First Medical University, Jinan, 250014, PR China
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Patil M, Wanjare S, Borse V, Srivastava R, Mehta P, Vavia P. Arginolipid: A membrane-active antifungal agent and its synergistic potential to combat drug resistance in clinical Candida isolates. Arch Pharm (Weinheim) 2019; 353:e1900180. [PMID: 31631383 DOI: 10.1002/ardp.201900180] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Revised: 09/10/2019] [Accepted: 09/22/2019] [Indexed: 11/05/2022]
Abstract
Antifungal drug resistance exhibits a major clinical challenge for treating nosocomial fungal infections. To find a possible solution, we synthesized and studied the antifungal activities of three different arginolipids (Nα -acyl-arginine ethyl ester) against clinical drug-resistant isolates of Candida. The most active arginolipid, oleoyl arginine ethyl ester (OAEE) consisting of a long unsaturated hydrophobic chain, was tested for its mode of action, which revealed that it altered ergosterol biosynthesis and compromised the fungal cell membrane. Also, OAEE was found to exhibit synergistic interactions with fluconazole (FLU) or amphotericin B (AmB) against planktonic Candida cells, wherein it reduced the inhibitory concentrations of these drugs to their in vitro susceptible range. Studies conducted against the C. tropicalis biofilm revealed that the OAEE+AmB combination synergistically reduced the metabolic activity and hyphal density in biofilms, whereas OAEE+FLU was found to be additive against most cases. Finally, the evaluated selective toxicity of OAEE toward fungal cells over mammalian cells could establish it as an alternative treatment for combating drug-resistant Candida infections.
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Affiliation(s)
- Mrunal Patil
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Mumbai, India
| | - Shashir Wanjare
- Department of Microbiology, Seth G.S. Medical College and K.E.M. Hospital, Mumbai, India
| | - Vivek Borse
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay (IIT-B), Mumbai, India
| | - Rohit Srivastava
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay (IIT-B), Mumbai, India
| | - Preeti Mehta
- Department of Microbiology, Seth G.S. Medical College and K.E.M. Hospital, Mumbai, India
| | - Pradeep Vavia
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Mumbai, India
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Essential Oils and Their Natural Active Compounds Presenting Antifungal Properties. Molecules 2019; 24:molecules24203713. [PMID: 31619024 PMCID: PMC6832927 DOI: 10.3390/molecules24203713] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 10/13/2019] [Accepted: 10/14/2019] [Indexed: 12/14/2022] Open
Abstract
The current rise in invasive fungal infections due to the increase in immunosuppressive therapies is a real concern. Moreover, the emergence of resistant strains induces therapeutic failures. In light of these issues, new classes of antifungals are anticipated. Therefore, the plant kingdom represents an immense potential of natural resources to exploit for these purposes. The aim of this review is to provide information about the antifungal effect of some important essential oils, and to describe the advances made in determining the mechanism of action more precisely. Finally, the issues of toxicity and resistance of fungi to essential oils will be discussed.
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Tariq S, Wani S, Rasool W, Shafi K, Bhat MA, Prabhakar A, Shalla AH, Rather MA. A comprehensive review of the antibacterial, antifungal and antiviral potential of essential oils and their chemical constituents against drug-resistant microbial pathogens. Microb Pathog 2019; 134:103580. [DOI: 10.1016/j.micpath.2019.103580] [Citation(s) in RCA: 184] [Impact Index Per Article: 36.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Revised: 06/02/2019] [Accepted: 06/05/2019] [Indexed: 01/25/2023]
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The efflux pump inhibitor tetrandrine exhibits synergism with fluconazole or voriconazole against Candida parapsilosis. Mol Biol Rep 2019; 46:5867-5874. [DOI: 10.1007/s11033-019-05020-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Accepted: 08/03/2019] [Indexed: 12/12/2022]
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Xu J, Liu R, Sun F, An L, Shang Z, Kong L, Yang M. Eucalyptal D Enhances the Antifungal Effect of Fluconazole on Fluconazole-Resistant Candida albicans by Competitively Inhibiting Efflux Pump. Front Cell Infect Microbiol 2019; 9:211. [PMID: 31281800 PMCID: PMC6595430 DOI: 10.3389/fcimb.2019.00211] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 05/31/2019] [Indexed: 12/29/2022] Open
Abstract
The frequent emergence of azole-resistant strains has increasingly led azoles to fail in treating candidiasis. Combination with other drugs is a good option to effectively reduce or retard its incidence of resistance. Natural products are a promising synergist source to assist azoles in treating resistant candidiasis. Eucalyptal D (ED), a formyl-phloroglucinol meroterpenoid, is one of the natural synergists, which could significantly enhance the anticandidal activity of fluconazole (FLC) in treating FLC resistant C. albicans. The checkerboard microdilution assay showed their synergistic effect. The agar disk diffusion test illustrated the key role of ED in synergy. The rhodamine 6G (R6G) efflux assay reflected ED could reduce drug efflux, but quantitative reverse transcription PCR analysis revealed the upregulation of CDR1 and CDR2 genes in ED treating group. Efflux pump-deficient strains were hyper-susceptible to ED, thus ED was speculated to be the substrate of efflux pump Cdr1p and Cdr2p to competitively inhibit the excretion of FLC or R6G, which mainly contributed to its synergistic effect.
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Affiliation(s)
- Jiali Xu
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, China
| | - Ruihuan Liu
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, China
| | - Fujuan Sun
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, China
| | - Lin An
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, China
| | - Zhichun Shang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, China
| | - Lingyi Kong
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, China
| | - Minghua Yang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, China
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Antifungal activity of selected essential oils against Fusarium culmorum and F. graminearum and their secondary metabolites in wheat seeds. Arch Microbiol 2019; 201:1085-1097. [PMID: 31123790 PMCID: PMC6746685 DOI: 10.1007/s00203-019-01673-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 05/05/2019] [Accepted: 05/10/2019] [Indexed: 10/31/2022]
Abstract
Essential oils (EOs) are products of plant origin and include mixtures of different chemical compounds. These volatile substances have many interesting properties, including antifungal properties. Fungi may develop under field conditions on crops such as wheat or corn and are able to synthesize mycotoxins, which adversely affect livestock and human health. In the present study, selected EOs were used to inhibit the growth of Fusarium graminearum and F. culmorum and reduce the concentrations of mycotoxins in wheat grain. The EOs significantly inhibited the growth of tested Fusarium species (90.99-99.99%), as determined based on ergosterol quantitative analysis. Only the addition of orange oil to F. culmorum exhibits a different inhibition capacity (68.13%). EO application resulted in a large reduction in zearalenone content (99.08-99.99%); only in the case of orange oil application was the reduction estimated at approximately 68.33%. However, all EOs provided a significant reduction in the concentration levels of group B trichothecenes (94.51-100%). It can be concluded that EOs inhibit the growth of fungi of the genus Fusarium and reduce concentration levels of the mycotoxins zearalenone and group B trichothecenes.
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Rajkowska K, Nowicka-Krawczyk P, Kunicka-Styczyńska A. Effect of Clove and Thyme Essential Oils on Candida Biofilm Formation and the Oil Distribution in Yeast Cells. Molecules 2019; 24:molecules24101954. [PMID: 31117281 PMCID: PMC6572016 DOI: 10.3390/molecules24101954] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 05/20/2019] [Accepted: 05/20/2019] [Indexed: 01/22/2023] Open
Abstract
Candida biofilm structure is particularly difficult to eradicate, since biofilm is much more resistant to antifungal agents than planktonic cells. In this context, a more effective strategy seems to be the prevention of biofilm formation than its eradication. The aim of the study was to examine whether the process of initial colonization of materials (glass, polyethylene terephthalate, polypropylene) by food-borne Candida sp. can be impeded by clove and thyme essential oils, used at their minimal inhibitory concentrations. In the presence of clove oil, 68.4–84.2% of the yeast tested showed a statistically significant reduction in biofilm formation, depending on the material. After treatment with thyme oil, statistically significant decrease in biofilm cell numbers was observed for 63.2–73.7% of yeasts. Confocal laser scanning microscopy showed diverse compounds of clove and thyme oils that were disparately located in C. albicans cell, on a cell wall and a cell membrane, in cytoplasm, and in vacuoles, depicting the multidirectional action of essential oils. However, essential oils that were used in sub-inhibitory concentration were sequestrated in the yeast vacuoles, which indicate the activation of Candida defense mechanisms by cell detoxification. Clove and thyme essential oils due to their anti-biofilm activity can be efficiently used in the prevention of the tested abiotic surfaces colonization by Candida sp.
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Affiliation(s)
- Katarzyna Rajkowska
- Institute of Fermentation Technology and Microbiology, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Wólczańska Str. 171/173, 90-924 Łódź, Poland.
| | - Paulina Nowicka-Krawczyk
- Department of Algology and Mycology, Faculty of Biology and Environmental Protection, University of Łódź, Banacha Str. 12/16, 90-237 Łódź, Poland.
| | - Alina Kunicka-Styczyńska
- Institute of Fermentation Technology and Microbiology, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Wólczańska Str. 171/173, 90-924 Łódź, Poland.
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Sharifzadeh A, Shokri H, Abbaszadeh S. Interaction of carvacroland voriconazole against drug – resistant Candida strains isolated from patients with candidiasis. J Mycol Med 2019; 29:44-48. [DOI: 10.1016/j.mycmed.2018.11.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Revised: 11/04/2018] [Accepted: 11/14/2018] [Indexed: 10/27/2022]
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40
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Tonon CC, Francisconi RS, Bordini EAF, Huacho PMM, Sardi JDCO, Spolidorio DMP. Interactions between Terpinen-4-ol and Nystatin on biofilm of Candida albicans and Candida tropicalis. Braz Dent J 2019; 29:359-367. [PMID: 30462762 DOI: 10.1590/0103-6440201802073] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 04/05/2018] [Indexed: 01/30/2023] Open
Abstract
The aim of this study was to evaluate the antifungal activity of Terpinen-4-ol associated with nystatin, on single and mixed species biofilms formed by Candida albicans and Candida tropicalis, as well as the effect of terpinen-4-ol on adhesion in oral cells and the enzymatic activity. The minimum inhibitory concentrations and minimum fungicide concentrations of terpinen-4-ol and nystatin on Candida albicans and Candida tropicalis were determined using the microdilution broth method, along with their synergistic activity ("checkerboard" method). Single and mixed species biofilms were prepared using the static microtiter plate model and quantified by colony forming units (CFU/mL). The effect of Terpinen-4-ol in adhesion of Candida albicans and Candida tropicalis in coculture with oral keratinocytes (NOK Si) was evaluated, as well as the enzymatic activity by measuring the size of the precipitation zone, after the growth agar to phospholipase, protease and hemolysin. Terpinen-4-ol (4.53 mg mL-1) and nystatin (0.008 mg mL-1) were able to inhibit biofilms growth, and a synergistic antifungal effect was showed with the drug association, reducing the inhibitory concentration of nystatin up to 8 times in single biofilm of Candida albicans, and 2 times in mixed species biofilm. A small decrease in the adhesion of Candida tropicalis in NOK Si cells was showed after treatment with terpinen-4-ol, and nystatin had a greater effect for both species. For enzymatic activity, the drugs showed no action. The effect potentiated by the combination of terpinen-4-ol and nystatin and the reduction of adhesion provide evidence of its potential as an anti-fungal agent.
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Affiliation(s)
- Caroline Coradi Tonon
- Department of Oral Diagnosis and Surgery, School of Dentistry, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil
| | - Renata Serignoli Francisconi
- Department of Physiology and Pathology, School of Dentistry, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil
| | - Ester Alves Ferreira Bordini
- Department of Physiology and Pathology, School of Dentistry, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil
| | | | - Janaína de Cássia Orlandi Sardi
- Department of Physiological Sciences, School of Dentistry of Piracicaba, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil
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Donadu MG, Usai D, Marchetti M, Usai M, Mazzarello V, Molicotti P, Montesu MA, Delogu G, Zanetti S. Antifungal activity of oils macerates of North Sardinia plants against Candida species isolated from clinical patients with candidiasis. Nat Prod Res 2019; 34:3280-3284. [PMID: 30676066 DOI: 10.1080/14786419.2018.1557175] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Antibiotic resistance is one of the bigger problem of public health: the rise of multi-drug resistant organisms causes a challenge in the treatment of infective diseases. Anti-Candida resistance to conventional antifungal agents has increased in the last period. Our research was intended to evaluate antimicrobial activity of oil macerate (OM) of Helichrysum microphyllum Cambess. subsp. tyrrhenicum Bacch., Brullo & Giusso and OM of Hypericum perforatum subsp. angustifolium against several clinical strains. The study included 30 patients with candidiasis who had not received any antifungal treatment before they were enrolled. A collection of 30 clinical isolates belonging to 5 different species of Candida spp. was selected for this study. The data obtained showed an interesting activity of both Oil Macerate especially against C. krusei and C. parapsilosis. On the contrary, H. microphyllum Oil Macerate has had a better activity than the H.perforatum especially in relation to C. glabrata and C. krusei.
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Affiliation(s)
- M G Donadu
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
| | - D Usai
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
| | - M Marchetti
- CNR, Institute of Biomolecular Chemistry, Li Punti, Sassari, Italy
| | - M Usai
- Department of Chemistry and Pharmacy, University of Sassari, Sassari, Italy
| | - V Mazzarello
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
| | - P Molicotti
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
| | - M A Montesu
- Department Medical, Surgical and Experimental Sciences, University of Sassari, Sassari, Italy
| | - G Delogu
- Sacro Cuore Catholic University, Institute of Microbiology, Rome, Italy
| | - S Zanetti
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
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Domingues Bianchin M, Borowicz SM, da Rosa Monte Machado G, Pippi B, Stanisçuaski Guterres S, Raffin Pohlmann A, Meneghello Fuentefria A, Clemes Külkamp-Guerreiro I. Lipid core nanoparticles as a broad strategy to reverse fluconazole resistance in multiple Candida species. Colloids Surf B Biointerfaces 2018; 175:523-529. [PMID: 30579053 DOI: 10.1016/j.colsurfb.2018.12.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 12/03/2018] [Accepted: 12/05/2018] [Indexed: 12/11/2022]
Abstract
Fungal resistance is the major problem related to fluconazole treatments. This study aims to develop innovative lipid core nanocapsules and nanostructured lipid carriers containing fluconazole, to study in vitro antifungal activity and to assess the possibility of resistance reversion in Candida albicans, C. glabrata, C. krusei, and C. tropicalis isolates. The action mechanism of nanoparticles was investigated through efflux pumps and scanning electron microscopy studies. The lipid core nanocapsules and nanostructured lipid carriers were prepared by interfacial deposition of preformed polymer and high-pressure homogenization methods, respectively. Both nanostructures presented sizes below 250 nm, SPAN < 1.6, negative zeta potential, pH slightly acid, high drug content and controlled drug release. The nanostructured lipid carriers were unable to reverse the fungal resistance. Lipid core nanoparticles displayed advantages such as a reduction in the effective dose of fluconazole and resistance reversion in all isolates tested - with multiple mechanisms of resistance. The main role of the supramolecular structure and the composition of the nanoparticles on antifungal mechanisms of action were discussed. The results achieved through this study have an impact on clinical therapy, with a potential application in the treatment of fungal infections caused by resistant isolates of Candida spp.
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Affiliation(s)
- Mariana Domingues Bianchin
- Programa de Pós-Graduação em Farmacologia e Terapêutica, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 500, Centro, Porto Alegre, RS, 90050-170, Brazil
| | - Sílvia Maria Borowicz
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Av Ipiranga, 2752, Santana, Porto Alegre, RS, 90610-000, Brazil
| | - Gabriella da Rosa Monte Machado
- Programa de Pós-Graduação em Microbiologia Agrícola e do Ambiente, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 500, Centro, Porto Alegre, RS, 90050-170, Brazil
| | - Bruna Pippi
- Programa de Pós-Graduação em Microbiologia Agrícola e do Ambiente, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 500, Centro, Porto Alegre, RS, 90050-170, Brazil
| | - Sílvia Stanisçuaski Guterres
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Av Ipiranga, 2752, Santana, Porto Alegre, RS, 90610-000, Brazil
| | - Adriana Raffin Pohlmann
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Av Ipiranga, 2752, Santana, Porto Alegre, RS, 90610-000, Brazil; Departamento de Química Orgânica, Instituto de química, Universidade Federal do Rio Grande do Sul, CP15003, Av. Bento Gonçalves, 9500, Agronomia, Porto Alegre, RS, 91501-970, Brazil
| | - Alexandre Meneghello Fuentefria
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Av Ipiranga, 2752, Santana, Porto Alegre, RS, 90610-000, Brazil; Programa de Pós-Graduação em Microbiologia Agrícola e do Ambiente, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 500, Centro, Porto Alegre, RS, 90050-170, Brazil
| | - Irene Clemes Külkamp-Guerreiro
- Programa de Pós-Graduação em Farmacologia e Terapêutica, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 500, Centro, Porto Alegre, RS, 90050-170, Brazil; Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Av Ipiranga, 2752, Santana, Porto Alegre, RS, 90610-000, Brazil.
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43
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Anti-Candida Activity of Geraniol: Effect on Hydrolytic Enzyme Secretion and Biofilm Formation. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2018. [DOI: 10.22207/jpam.12.3.36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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44
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Hu LB, Ban FF, Li HB, Qian PP, Shen QS, Zhao YY, Mo HZ, Zhou X. Thymol Induces Conidial Apoptosis in Aspergillus flavus via Stimulating K + Eruption. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:8530-8536. [PMID: 30044621 DOI: 10.1021/acs.jafc.8b02117] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Aspergillus flavus is a notorious foodborne fungus, posing a significant risk to humans in the form of hepatocellular carcinoma or aspergillosis. Thymol, as a food preservative, could efficiently kill conidia of A. flavus. However, the underlying mechanisms by which thymol kills A. flavus are not completely understood. With specific fluorescent dyes, we detected several apoptotic hallmarks, including chromatin condensation, phosphatidylserine externalization, DNA damage, mitochondrial depolarization, and caspase 9 activation in conidia exposed to 200 μg/mL of thymol, indicating that thymol induced a caspase-dependent conidial apoptosis in A. flavus. Chemical-protein interactome (CPI) and autodock analyses showed that KCNAB, homologue to the β-subunit of the voltage-gated potassium channel (Kv) and aldo-keto reductase, was the potential target of thymol. Following studies demonstrated that thymol could activate the aldo-keto reductase activity of KCNAB in vitro and stimulate a transient K+ efflux in conidia, as determined using a Port-a-Patch. Blocking K+ eruption by 4-aminopyridine (a universal inhibitor of Kv) could significantly alleviate thymol-mediated conidial apoptosis, indicating that activation of Kv was responsible for the apoptosis. Taken together, our results revealed a K+ efflux-mediated apoptotic pathway in A. flavus, which greatly contributed to the development of an alternative strategy to control this pathogen.
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Affiliation(s)
- Liang-Bin Hu
- Department of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , China
| | - Fang-Fang Ban
- Department of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , China
| | - Hong-Bo Li
- Department of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , China
| | - Pan-Pan Qian
- Department of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , China
| | - Qing-Shan Shen
- Department of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , China
| | - Yan-Yan Zhao
- Department of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , China
| | - Hai-Zhen Mo
- Department of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , China
| | - Xiaohui Zhou
- Department of Pathobiology & Veterinary Science , University of Connecticut , 61 North Eagleville Road , Storrs , Connecticut 06269 , United States
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45
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Antimicrobial Activity of Five Essential Oils against Bacteria and Fungi Responsible for Urinary Tract Infections. Molecules 2018; 23:molecules23071668. [PMID: 29987237 PMCID: PMC6100505 DOI: 10.3390/molecules23071668] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 07/04/2018] [Accepted: 07/05/2018] [Indexed: 01/17/2023] Open
Abstract
Urinary tract infections are frequently encountered in small animal practice. Escherichia coli and Enterococcus spp. are the most common agents associated to these infections, even though other bacteria and yeasts, such as Candida albicans and Candida famata, may be involved. In view of the increasing problem of the multi-drug resistance, the aim of this study was to investigate the antimicrobial activity of essential oils obtained from star anise (Illicium verum Hook.f.), basil (Ocimum basilicum L.), origanum (Origanum vulgare L.), clary sage (Salvia sclarea L.) and thymus (Thymus vulgaris L.) against multidrug-resistant strains of Escherichia coli, Enterococcus spp., Candida albicans and Candida famata previously isolated from dogs and cats with urinary tract infections. Enterococci were resistant to Illicium verum and Salvia sclarea, such as Candida to Salvia sclarea. Thymus vulgaris and Origanum vulgare essential oils showed the best activity against all the tested pathogens, so they could be proposed for the formulation of external and/or intravesical washes in small animals.
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Marchese A, Arciola CR, Coppo E, Barbieri R, Barreca D, Chebaibi S, Sobarzo-Sánchez E, Nabavi SF, Nabavi SM, Daglia M. The natural plant compound carvacrol as an antimicrobial and anti-biofilm agent: mechanisms, synergies and bio-inspired anti-infective materials. BIOFOULING 2018; 34:630-656. [PMID: 30067078 DOI: 10.1080/08927014.2018.1480756] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 05/20/2018] [Indexed: 06/08/2023]
Abstract
Carvacrol (5-isopropyl-2-methyl phenol) is a natural compound that occurs in the leaves of a number of plants and herbs including wild bergamot, thyme and pepperwort, but which is most abundant in oregano. The aim of this review is to analyse the scientific data from the last five years (2012-2017) on the antimicrobial and anti-biofilm activities of carvacrol, targeting different bacteria and fungi responsible for human infectious diseases. The antimicrobial and anti-biofilm mechanisms of carvacrol and its synergies with antibiotics are illustrated. The potential of carvacrol-loaded anti-infective nanomaterials is underlined. Carvacrol shows excellent antimicrobial and anti-biofilm activities, and is a very interesting bioactive compound against fungi and a wide range of Gram-positive and Gram-negative bacteria, and being active against both planktonic and sessile human pathogens. Moreover, carvacrol lends itself to being combined with nanomaterials, thus providing an opportunity for preventing biofilm-associated infections by new bio-inspired, anti-infective materials.
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Affiliation(s)
- Anna Marchese
- a Microbiology Section DISC-Ospedale Policlinico San Martino , University of Genoa , Genoa , Italy
| | - Carla Renata Arciola
- b Department of Experimental, Diagnostic and Specialty Medicine , University of Bologna , Bologna , Italy
- c Research Unit on Implant Infections , Rizzoli Orthopaedic Institute , Bologna , Italy
| | - Erika Coppo
- d Microbiology Section DISC , University of Genoa , Genoa , Italy
| | - Ramona Barbieri
- d Microbiology Section DISC , University of Genoa , Genoa , Italy
| | - Davide Barreca
- e Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina , Messina , Italy
| | - Salima Chebaibi
- f Department of Health and Environment, Science Faculty , University Moulay Ismail , Meknes , Morocco
| | - Eduardo Sobarzo-Sánchez
- g Laboratory of Pharmaceutical Chemistry, Faculty of Pharmacy , University of Santiago de Compostela , Spain
- h Instituto de Investigación e Innovación en Salud, Facultad de Ciencias de la Salud , Universidad Central de Chile , Chile
| | - Seyed Fazel Nabavi
- i Applied Biotechnology Research Center , Baqiyatallah University of Medical Sciences , Tehran , Iran
| | - Seyed Mohammad Nabavi
- i Applied Biotechnology Research Center , Baqiyatallah University of Medical Sciences , Tehran , Iran
| | - Maria Daglia
- j Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section , University of Pavia , Pavia , Italy
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47
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Gucwa K, Milewski S, Dymerski T, Szweda P. Investigation of the Antifungal Activity and Mode of Action of Thymus vulgaris, Citrus limonum, Pelargonium graveolens, Cinnamomum cassia, Ocimum basilicum, and Eugenia caryophyllus Essential Oils. Molecules 2018; 23:E1116. [PMID: 29738503 PMCID: PMC6099571 DOI: 10.3390/molecules23051116] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 04/29/2018] [Accepted: 05/01/2018] [Indexed: 11/16/2022] Open
Abstract
The antimicrobial activity of plant oils and extracts has been recognized for many years. In this study the activity of Thymus vulgaris, Citrus limonum, Pelargonium graveolens, Cinnamomum cassia, Ocimumbasilicum, and Eugenia caryophyllus essential oils (EOs) distributed by Pollena Aroma (Nowy Dwór Mazowiecki, Poland) was investigated against a group of 183 clinical isolates of C. albicans and 76 isolates of C. glabrata. All of the oils exhibited both fungistatic and fungicidal activity toward C. albicans and C. glabrata isolates. The highest activity was observed for cinnamon oil, with MIC (Minimum Inhibitory Concentration) values in the range 0.002⁻0.125% (v/v). The MIC values of the rest of the oils were in the range 0.005% (or less) to 2.5% (v/v). In most cases MFC (Minimum Fungicidal Concentration) values were equal to MIC or twice as high. Additionally, we examined the mode of action of selected EOs. The effect on cell wall components could not be clearly proved. Three of the tested EOs (thyme, lemon, and clove) affected cell membranes. At the same time, thyme, cinnamon, and clove oil influenced potassium ion efflux, which was not seen in the case of lemon oil. All of the tested oils demonstrated the ability to inhibit the transition of yeast to mycelium form, but the effect was the lowest in the case of cinnamon oil.
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Affiliation(s)
- Katarzyna Gucwa
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12 Str., 80-233 Gdańsk, Poland.
| | - Sławomir Milewski
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12 Str., 80-233 Gdańsk, Poland.
| | - Tomasz Dymerski
- Department of Analytical Chemistry, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12 Str., 80-233 Gdańsk, Poland.
| | - Piotr Szweda
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12 Str., 80-233 Gdańsk, Poland.
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48
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Sharifzadeh A, Khosravi AR, Shokri H, Shirzadi H. Potential effect of 2-isopropyl-5-methylphenol (thymol) alone and in combination with fluconazole against clinical isolates of Candida albicans, C. glabrata and C. krusei. J Mycol Med 2018; 28:294-299. [PMID: 29661606 DOI: 10.1016/j.mycmed.2018.04.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 04/04/2018] [Accepted: 04/05/2018] [Indexed: 01/06/2023]
Abstract
Limitations of antifungals used in the treatment of candidiasis, as the development of resistant strains, are known by the scientific community. In this context, the aim of this study was to investigate the activity of 2-isopropyl-5-methylphenol (thymol) in combination with fluconazole (FLZ) against clinical Candida strains. The antifungal activity of thymol along with FLZ was evaluated by the Clinical Laboratory Standards Institute (CLSI) M27-A2 broth microdilution method. In addition, synergism was observed for clinical strains of Candida spp. with combination of thymol-FLZ evaluated by the chequerboard microdilution method. The mean of minimum inhibitory concentration (MIC) values of thymol and FLZ were 49.37 and 0.475μg/ml for C. albicans, 51.25 and 18.80μg/ml for C. glabrata and 70 and 179.20μg/ml for C. krusei strains, respectively. Thymol in combination with FLZ exhibited the synergistic effects against all species of Candida tested. FICI values for thymol plus FLZ ranged from 0.366 to 0.607 for C. albicans strains, 0.367 to 0.482 for C. glabrata strains, and 0.375 to 0.563 for C. krusei strains. No antagonistic activity was seen in the strains tested. Thymol was found to have a fungicidal effect on Candida species and a synergistic effect when combined with FLZ.
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Affiliation(s)
- A Sharifzadeh
- Mycology Research Center, Faculty of Veterinary Medicine, University of Tehran, Azadi street, Tehran, Iran.
| | - A R Khosravi
- Mycology Research Center, Faculty of Veterinary Medicine, University of Tehran, Azadi street, Tehran, Iran
| | - H Shokri
- Department of Pathobiology, Faculty of Veterinary Medicine, Amol University of Special Modern Technologies, Amol, Iran
| | - H Shirzadi
- Mycology Research Center, Faculty of Veterinary Medicine, University of Tehran, Azadi street, Tehran, Iran
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49
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Shahina Z, El-Ganiny AM, Minion J, Whiteway M, Sultana T, Dahms TES. Cinnamomum zeylanicum bark essential oil induces cell wall remodelling and spindle defects in Candida albicans. Fungal Biol Biotechnol 2018; 5:3. [PMID: 29456868 PMCID: PMC5807769 DOI: 10.1186/s40694-018-0046-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 01/16/2018] [Indexed: 12/01/2022] Open
Abstract
Background Cinnamon (Cinnamomum zeylanicum) bark extract exhibits potent inhibitory activity against Candida albicans but the antifungal mechanisms of this essential oil remain largely unexplored. Results We analyzed the impact of cinnamon bark oil on C. albicans RSY150, and clinical strains isolated from patients with candidemia and candidiasis. The viability of RSY150 was significantly compromised in a dose dependent manner when exposed to cinnamon bark oil, with extensive cell surface remodelling at sub inhibitory levels (62.5 μg/mL). Atomic force microscopy revealed cell surface exfoliation, altered ultrastructure and reduced cell wall integrity for both RSY150 and clinical isolates exposed to cinnamon bark oil. Cell wall damage induced by cinnamon bark oil was confirmed by exposure to stressors and the sensitivity of cell wall mutants involved in cell wall organization, biogenesis, and morphogenesis. The essential oil triggered cell cycle arrest by disrupting beta tubulin distribution, which led to mitotic spindle defects, ultimately compromising the cell membrane and allowing leakage of cellular components. The multiple targets of cinnamon bark oil can be attributed to its components, including cinnamaldehyde (74%), and minor components (< 6%) such as linalool (3.9%), cinamyl acetate (3.8%), α-caryophyllene (5.3%) and limonene (2%). Complete inhibition of the mitotic spindle assembly was observed in C. albicans treated with cinnamaldehyde at MIC (112 μg/mL). Conclusions Since cinnamaldehyde disrupts both the cell wall and tubulin polymerization, it may serve as an effective antifungal, either by chemical modification to improve its specificity and efficacy or in combination with other antifungal drugs. Electronic supplementary material The online version of this article (10.1186/s40694-018-0046-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Zinnat Shahina
- 1Department of Chemistry and Biochemistry, University of Regina, 3737 Wascana Parkway, Regina, SK Canada
| | - Amira M El-Ganiny
- 2Microbiology and Immunology Department, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | | | - Malcolm Whiteway
- 4Centre for Structural and Functional Genomics, Concordia University, Montreal, QC Canada
| | - Taranum Sultana
- 1Department of Chemistry and Biochemistry, University of Regina, 3737 Wascana Parkway, Regina, SK Canada
| | - Tanya E S Dahms
- 1Department of Chemistry and Biochemistry, University of Regina, 3737 Wascana Parkway, Regina, SK Canada.,3Regina Qu'Appelle Health Region, Regina, SK Canada
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Targeting Candida spp. to develop antifungal agents. Drug Discov Today 2018; 23:802-814. [PMID: 29353694 DOI: 10.1016/j.drudis.2018.01.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Revised: 12/09/2017] [Accepted: 01/04/2018] [Indexed: 01/15/2023]
Abstract
Invasive fungal infections are a complex challenge throughout the world because of their high incidence, mainly in critically ill patients, and high mortality rates. The antifungal agents currently available are limited; thus, there is a need for the rapid development of new drugs. In silico methods are a modern strategy to explore interactions between new compounds and specific fungal targets, but they depend on precise genetic information. Here, we discuss the main Candida spp. target genes, including information about null mutants, virulence, cytolocalization, co-regulatory genes, and compounds that are related to protein expression. These data will provide a basis for the future in silico development of antifungal drugs.
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