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Wang R, Lan C, Benlagha K, Camara NOS, Miller H, Kubo M, Heegaard S, Lee P, Yang L, Forsman H, Li X, Zhai Z, Liu C. The interaction of innate immune and adaptive immune system. MedComm (Beijing) 2024; 5:e714. [PMID: 39286776 PMCID: PMC11401974 DOI: 10.1002/mco2.714] [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: 10/09/2023] [Revised: 08/11/2024] [Accepted: 08/11/2024] [Indexed: 09/19/2024] Open
Abstract
The innate immune system serves as the body's first line of defense, utilizing pattern recognition receptors like Toll-like receptors to detect pathogens and initiate rapid response mechanisms. Following this initial response, adaptive immunity provides highly specific and sustained killing of pathogens via B cells, T cells, and antibodies. Traditionally, it has been assumed that innate immunity activates adaptive immunity; however, recent studies have revealed more complex interactions. This review provides a detailed dissection of the composition and function of the innate and adaptive immune systems, emphasizing their synergistic roles in physiological and pathological contexts, providing new insights into the link between these two forms of immunity. Precise regulation of both immune systems at the same time is more beneficial in the fight against immune-related diseases, for example, the cGAS-STING pathway has been found to play an important role in infections and cancers. In addition, this paper summarizes the challenges and future directions in the field of immunity, including the latest single-cell sequencing technologies, CAR-T cell therapy, and immune checkpoint inhibitors. By summarizing these developments, this review aims to enhance our understanding of the complexity interactions between innate and adaptive immunity and provides new perspectives in understanding the immune system.
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Affiliation(s)
- Ruyuan Wang
- Department of Thyroid and Breast Surgery Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Wuhan China
| | - Caini Lan
- Cancer Center Union Hospital, Tongji Medical College, Huazhong University of Science and Technology Wuhan China
| | - Kamel Benlagha
- Alloimmunity, Autoimmunity and Transplantation Université de Paris, Institut de Recherche Saint-Louis, EMiLy, INSERM U1160 Paris France
| | - Niels Olsen Saraiva Camara
- Department of Immunology Institute of Biomedical Sciences University of São Paulo (USP) São Paulo São Paulo Brazil
| | - Heather Miller
- Coxiella Pathogenesis Section, Laboratory of Bacteriology Rocky Mountain Laboratories National Institute of Allergy and Infectious Diseases, National Institutes of Health Hamilton Montana USA
| | - Masato Kubo
- Division of Molecular Pathology Research Institute for Biomedical Sciences (RIBS) Tokyo University of Science Noda Chiba Japan
| | - Steffen Heegaard
- Department of Ophthalmology Rigshospitalet Hospital Copenhagen University Copenhagen Denmark
| | - Pamela Lee
- Department of Paediatrics and Adolescent Medicine Li Ka Shing Faculty of Medicine The University of Hong Kong Hong Kong China
| | - Lu Yang
- Department of Pathogen Biology School of Basic Medicine Tongji Medical College and State Key Laboratory for Diagnosis and treatment of Severe Zoonotic Infectious Disease, Huazhong University of Science and Technology Wuhan Hubei China
| | - Huamei Forsman
- Department of Laboratory Medicine Institute of Biomedicine, University of Gothenburg Gothenburg Sweden
| | - Xingrui Li
- Department of Thyroid and Breast Surgery Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology Wuhan China
| | - Zhimin Zhai
- Department of Hematology The Second Hospital of Anhui Medical University Hefei China
| | - Chaohong Liu
- Department of Pathogen Biology School of Basic Medicine Tongji Medical College and State Key Laboratory for Diagnosis and treatment of Severe Zoonotic Infectious Disease, Huazhong University of Science and Technology Wuhan Hubei China
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Curvelo JADR, Barreto ALS, Bayona-Pacheco BL, de Moraes DC, Portela MB, Ferreira-Pereira A, Adade CM, Souto-Padrón T, Soares RMDA. Salivary proteins modulate Candida albicans virulence and may prevent oropharingeal candidiasis. Braz J Microbiol 2024:10.1007/s42770-024-01517-5. [PMID: 39320637 DOI: 10.1007/s42770-024-01517-5] [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: 07/04/2024] [Accepted: 09/09/2024] [Indexed: 09/26/2024] Open
Abstract
Oral candidiasis can be presented in different ways due to the virulence factors of its etiology such as Candida albicans that have developed an effective set of these factors that are able to improve its pathogenesis. The role of salivary immunological components in the development of candidiasis can provide insights for the development of new methodologies aiming to control this disease. The aim of this study was to evaluate the antifungal activity of two salivary components, histatin 5 and lactoferrin on C. albicans viability and virulence using a fluconazole resistant C. albicans clinical strain. Results showed that histatin 5 and lactoferrin decreased cell viability, and the cell surface hydrophobicity was increased by 18% in presence of 151 µg/mL of histatin 5 but was not altered by lactoferrin. It was observed the reduction of 69.3% in the expression of mannoproteins on C. albicans surface in the presence of 151 µg/mL of histatin, but proteolytic activity of serine proteinases was not inhibited by any of the proteins. Histatin 5 altered cell ultrastructure predominantly in the cytoplasmic compartment. However, this peptide does not interfere with mitochondrial function neither in membrane permeability of the yeasts. The association index between C. albicans and epithelial cells was increased by 51% in presence of 151 µg/mL of histatin. Results suggest that histatin 5 and lactoferrin affects viability and virulence of C. albicans at physiological levels, and the maintenance of these levels may be essential in the prevention of oropharyngeal candidiasis. Exogenous administration of these proteins may become a therapeutic alternative for resistant strains of C. albicans, circumventing toxicity issues, considering their constitutive features.
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Affiliation(s)
| | - Anna Lea Silva Barreto
- Grande Área Ciências Biológicas e da Saúde, Centro Universitário IBMR, Rio de Janeiro, Brazil.
| | - Brayan Leonardo Bayona-Pacheco
- Departamento de Medicina, División Ciencias de la Salud, Universidad del Norte, Km 5, via Puerto Colombia, Área Metropolitana de Barranquilla, 081007, Colombia
| | - Daniel Clemente de Moraes
- Laboratório de Bioquímica Microbiana, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Maristela Barbosa Portela
- Faculdade de Odontologia, Centro de Ciências Médicas, Universidade Federal Fluminense, Niterói, Brazil
| | - Antônio Ferreira-Pereira
- Laboratório de Bioquímica Microbiana, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Camila Marques Adade
- NanoOnco3D, Hospital Universitário Antônio Pedro, Universidade Federal Fluminense, Niterói, Brazil
| | - Thaïs Souto-Padrón
- Laboratório de Bioquímica Microbiana, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rosangela Maria de Araújo Soares
- Laboratório de Bioquímica Microbiana, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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Andrés MT, Fierro P, Antuña V, Fierro JF. The Antimicrobial Activity of Human Defensins at Physiological Non-Permeabilizing Concentrations Is Caused by the Inhibition of the Plasma Membrane H +-ATPases. Int J Mol Sci 2024; 25:7335. [PMID: 39000442 PMCID: PMC11242853 DOI: 10.3390/ijms25137335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 06/21/2024] [Accepted: 06/28/2024] [Indexed: 07/16/2024] Open
Abstract
Human defensins are cysteine-rich peptides (Cys-rich peptides) of the innate immune system. Defensins contain an ancestral structural motif (i.e., γ-core motif) associated with the antimicrobial activity of natural Cys-rich peptides. In this study, low concentrations of human α- and β-defensins showed microbicidal activity that was not associated with cell membrane permeabilization. The cell death pathway was similar to that previously described for human lactoferrin, also an immunoprotein containing a γ-core motif. The common features were (1) cell death not related to plasma membrane (PM) disruption, (2) the inhibition of microbicidal activity via extracellular potassium, (3) the influence of cellular respiration on microbicidal activity, and (4) the influence of intracellular pH on bactericidal activity. In addition, in yeast, we also observed (1) partial K+-efflux mediated via Tok1p K+-channels, (2) the essential role of mitochondrial ATP synthase in cell death, (3) the increment of intracellular ATP, (4) plasma membrane depolarization, and (5) the inhibition of external acidification mediated via PM Pma1p H+-ATPase. Similar features were also observed with BM2, an antifungal peptide that inhibits Pma1p H+-ATPase, showing that the above coincident characteristics were a consequence of PM H+-ATPase inhibition. These findings suggest, for the first time, that human defensins inhibit PM H+-ATPases at physiological concentrations, and that the subsequent cytosolic acidification is responsible for the in vitro microbicidal activity. This mechanism of action is shared with human lactoferrin and probably other antimicrobial peptides containing γ-core motifs.
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Affiliation(s)
- María T. Andrés
- Laboratory of Oral Microbiology (LMO), University Clinic of Dentistry (CLUO), University of Oviedo, 33006 Oviedo, Asturias, Spain; (M.T.A.); (P.F.); (V.A.)
- Health Research Institute of the Principality of Asturias (ISPA), 33011 Oviedo, Spain
- SamerLabs SL, Asturias Technology Park, 33428 Llanera, Spain
| | - Patricia Fierro
- Laboratory of Oral Microbiology (LMO), University Clinic of Dentistry (CLUO), University of Oviedo, 33006 Oviedo, Asturias, Spain; (M.T.A.); (P.F.); (V.A.)
- Primary Care Emergency Service, Cantabrian Health Service, 39000 Santander, Spain
| | - Victoria Antuña
- Laboratory of Oral Microbiology (LMO), University Clinic of Dentistry (CLUO), University of Oviedo, 33006 Oviedo, Asturias, Spain; (M.T.A.); (P.F.); (V.A.)
| | - José F. Fierro
- Laboratory of Oral Microbiology (LMO), University Clinic of Dentistry (CLUO), University of Oviedo, 33006 Oviedo, Asturias, Spain; (M.T.A.); (P.F.); (V.A.)
- Health Research Institute of the Principality of Asturias (ISPA), 33011 Oviedo, Spain
- Deparment of Functional Biology (Microbiology), Faculty of Medicine, University of Oviedo, 33006 Oviedo, Spain
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Alfaifi AA, Wang TW, Perez P, Sultan AS, Meiller TF, Rock P, Kleiner DE, Chertow DS, Hewitt SM, Gasmi B, Stein S, Ramelli S, Martin D, Warner BM, Jabra-Rizk MA. SARS-CoV-2 Infection of Salivary Glands Compromises Oral Antifungal Innate Immunity and Predisposes to Oral Candidiasis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.13.593942. [PMID: 38798323 PMCID: PMC11118411 DOI: 10.1101/2024.05.13.593942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Saliva contains antimicrobial peptides considered integral components of host innate immunity, and crucial for protection against colonizing microbial species. Most notable is histatin-5 which is exclusively produced in salivary glands with uniquely potent antifungal activity against the opportunistic pathogen Candida albicans. Recently, SARS-CoV-2 was shown to replicate in salivary gland acinar cells eliciting local immune cell activation. In this study, we performed mechanistic and clinical studies to investigate the implications of SARS-CoV-2 infection on salivary histatin-5 production and Candida colonization. Bulk RNA-sequencing of parotid salivary glands from COVID-19 autopsies demonstrated statistically significant decreased expression of histatin genes. In situ hybridization, coupled with immunofluorescence for co-localization of SARS-CoV-2 spike and histatin in salivary gland cells, showed that histatin was absent or minimally present in acinar cells with replicating viruses. To investigate the clinical implications of these findings, salivary histatin-5 levels and oral Candida burden in saliva samples from three independent cohorts of mild and severe COVID-19 patients and matched healthy controls were evaluated. Results revealed significantly reduced histatin-5 in SARS-CoV-2 infected subjects, concomitant with enhanced prevalence of C. albicans. Analysis of prospectively recovered samples indicated that the decrease in histatin-5 is likely reversible in mild-moderate disease as concentrations tended to increase during the post-acute phase. Importantly, salivary cytokine profiling demonstrated correlations between activation of the Th17 inflammatory pathway, changes in histatin-5 concentrations, and subsequent clearance of C. albicans in a heavily colonized subject. The importance of salivary histatin-5 in controlling the proliferation of C. albicans was demonstrated using an ex vivo assay where C. albicans was able to proliferate in COVID-19 saliva with low histatin-5, but not with high histatin-5. Taken together, the findings from this study provide direct evidence implicating SARS-CoV-2 infection of salivary glands with compromised oral innate immunity, and potential predisposition to oral candidiasis.
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Affiliation(s)
- Areej A. Alfaifi
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, Maryland, United States of America
- Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
- King Abdullah International Medical Research Center (KAIMRC), Riyadh, Saudi Arabia
| | - Tristan W. Wang
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, Maryland, United States of America
| | - Paola Perez
- Salivary Disorders Unit, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Ahmed S. Sultan
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, Maryland, United States of America
- University of Maryland Greenebaum Cancer Center, University of Maryland Baltimore, Maryland, United States of America
| | - Timothy F. Meiller
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, Maryland, United States of America
- University of Maryland Greenebaum Cancer Center, University of Maryland Baltimore, Maryland, United States of America
| | - Peter Rock
- Department of Anesthesia, School of Medicine, University of Maryland Baltimore, Maryland, United States of America
| | - David E. Kleiner
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Daniel S. Chertow
- Critical Care Medicine Department, Clinical Center, National Institutes of Health, Bethesda, MD, USA
- Laboratory of Virology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, United States of America, USA
| | - Stephen M. Hewitt
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Billel Gasmi
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Sydney Stein
- Critical Care Medicine Department, Clinical Center, National Institutes of Health, Bethesda, MD, USA
| | - Sabrina Ramelli
- Critical Care Medicine Department, Clinical Center, National Institutes of Health, Bethesda, MD, USA
| | - Daniel Martin
- Genomics and Computational Biology Core, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Blake M. Warner
- Salivary Disorders Unit, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Mary Ann Jabra-Rizk
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, Maryland, United States of America
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, Maryland, United States of America
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5
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Loh JT, Lam KP. Fungal infections: Immune defense, immunotherapies and vaccines. Adv Drug Deliv Rev 2023; 196:114775. [PMID: 36924530 DOI: 10.1016/j.addr.2023.114775] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Revised: 03/05/2023] [Accepted: 03/07/2023] [Indexed: 03/17/2023]
Abstract
Invasive fungal infection is an under recognized and emerging global health threat. Recently, the World Health Organization (WHO) released the first ever list of health-threatening fungi to guide research and public health interventions to strengthen global response to fungi infections and antifungal resistance. Currently, antifungal drugs only demonstrate partial success in improving prognosis of infected patients, and this is compounded by the rapid evolution of drug resistance among fungi species. The increased prevalence of fungal infections in individuals with underlying immunological deficiencies reflects the importance of an intact host immune system in controlling mycoses, and further highlights immunomodulation as a potential new avenue for the treatment of disseminated fungal diseases. In this review, we will summarize how host innate immune cells sense invading fungi through their pattern recognition receptors, and subsequently initiate a series of effector mechanisms and adaptive immune responses to mediate fungal clearance. In addition, we will discuss emerging preclinical and clinical data on antifungal immunotherapies and fungal vaccines which can potentially expand our antifungal armamentarium in future.
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Affiliation(s)
- Jia Tong Loh
- Singapore Immunology Network, Agency for Science, Technology and Research, 8A Biomedical Grove, S138648, Republic of Singapore.
| | - Kong-Peng Lam
- Singapore Immunology Network, Agency for Science, Technology and Research, 8A Biomedical Grove, S138648, Republic of Singapore; Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5, Science Drive 2, S117545, Republic of Singapore; School of Biological Sciences, College of Science, Nanyang Technological University, 60, Nanyang Drive, S637551, Republic of Singapore.
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Inhibition of SARS-CoV-2 Infection by Human Defensin HNP1 and Retrocyclin RC-101. J Mol Biol 2022; 434:167225. [PMID: 34487793 PMCID: PMC8413479 DOI: 10.1016/j.jmb.2021.167225] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 08/26/2021] [Accepted: 08/27/2021] [Indexed: 12/16/2022]
Abstract
Severe acute respiratory syndrome coronavirus (SARS-CoV)-2 is an enveloped virus responsible for the COVID-19 pandemic. The emergence of new potentially more transmissible and vaccine-resistant variants of SARS-CoV-2 is an ever-present threat. Thus, it remains essential to better understand innate immune mechanisms that can inhibit the virus. One component of the innate immune system with broad antipathogen, including antiviral, activity is a group of cationic immune peptides termed defensins. The ability of defensins to neutralize enveloped and non-enveloped viruses and to inactivate numerous bacterial toxins correlate with their ability to promote the unfolding of proteins with high conformational plasticity. We found that human neutrophil α-defensin HNP1 binds to SARS-CoV-2 Spike protein with submicromolar affinity that is more than 20 fold stronger than its binding to serum albumin. As such, HNP1, as well as a θ-defensin retrocyclin RC-101, both interfere with Spike-mediated membrane fusion, Spike-pseudotyped lentivirus infection, and authentic SARS-CoV-2 infection in cell culture. These effects correlate with the abilities of the defensins to destabilize and precipitate Spike protein and inhibit the interaction of Spike with the ACE2 receptor. Serum reduces the anti-SARS-CoV-2 activity of HNP1, though at high concentrations, HNP1 was able to inactivate the virus even in the presence of serum. Overall, our results suggest that defensins can negatively affect the native conformation of SARS-CoV-2 Spike, and that α- and θ-defensins may be valuable tools in developing SARS-CoV-2 infection prevention strategies.
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Vanzolini T, Bruschi M, Rinaldi AC, Magnani M, Fraternale A. Multitalented Synthetic Antimicrobial Peptides and Their Antibacterial, Antifungal and Antiviral Mechanisms. Int J Mol Sci 2022; 23:545. [PMID: 35008974 PMCID: PMC8745555 DOI: 10.3390/ijms23010545] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/22/2021] [Accepted: 12/30/2021] [Indexed: 02/07/2023] Open
Abstract
Despite the great strides in healthcare during the last century, some challenges still remained unanswered. The development of multi-drug resistant bacteria, the alarming growth of fungal infections, the emerging/re-emerging of viral diseases are yet a worldwide threat. Since the discovery of natural antimicrobial peptides able to broadly hit several pathogens, peptide-based therapeutics have been under the lenses of the researchers. This review aims to focus on synthetic peptides and elucidate their multifaceted mechanisms of action as antiviral, antibacterial and antifungal agents. Antimicrobial peptides generally affect highly preserved structures, e.g., the phospholipid membrane via pore formation or other constitutive targets like peptidoglycans in Gram-negative and Gram-positive bacteria, and glucan in the fungal cell wall. Additionally, some peptides are particularly active on biofilm destabilizing the microbial communities. They can also act intracellularly, e.g., on protein biosynthesis or DNA replication. Their intracellular properties are extended upon viral infection since peptides can influence several steps along the virus life cycle starting from viral receptor-cell interaction to the budding. Besides their mode of action, improvements in manufacturing to increase their half-life and performances are also taken into consideration together with advantages and impairments in the clinical usage. Thus far, the progress of new synthetic peptide-based approaches is making them a promising tool to counteract emerging infections.
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Affiliation(s)
- Tania Vanzolini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, 61029 Urbino, PU, Italy; (T.V.); (M.M.); (A.F.)
| | - Michela Bruschi
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, 61029 Urbino, PU, Italy; (T.V.); (M.M.); (A.F.)
| | - Andrea C. Rinaldi
- Department of Biomedical Sciences, University of Cagliari, 09042 Monserrato, CA, Italy;
| | - Mauro Magnani
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, 61029 Urbino, PU, Italy; (T.V.); (M.M.); (A.F.)
| | - Alessandra Fraternale
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, 61029 Urbino, PU, Italy; (T.V.); (M.M.); (A.F.)
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Alfaifi A, Sultan AS, Montelongo-Jauregui D, Meiller TF, Jabra-Rizk MA. Long-Term Post-COVID-19 Associated Oral Inflammatory Sequelae. Front Cell Infect Microbiol 2022; 12:831744. [PMID: 35310855 PMCID: PMC8924417 DOI: 10.3389/fcimb.2022.831744] [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: 12/08/2021] [Accepted: 02/11/2022] [Indexed: 11/13/2022] Open
Abstract
The oral cavity remains an underappreciated site for SARS-CoV-2 infection despite the myriad oral conditions observed in COVID-19 patients. Recently, replicating SARS-CoV-2 was found inside salivary epithelial cells resulting in inflammation and atrophy of salivary glands. Saliva possesses healing properties crucial for maintaining the health of the oral mucosa. Specifically, salivary antimicrobial peptides, most notable, histatin-5 exclusively produced in salivary glands, plays a vital role in innate immunity against colonizing microbial species. The demonstration of SARS-CoV-2 destruction of gland tissue where histatin-5 is produced strongly indicate that histatin-5 production is compromised due to COVID-19. Here we present a case of a patient presenting with unexplained chronic oral dysesthesia and dysgeusia post-recovery from COVID-19. To explore potential physiological mechanisms behind the symptoms, we comparatively analyzed saliva samples from the patient and matched healthy subject for histatin-5 and key cytokines. Findings demonstrated significantly reduced histatin-5 levels in patient's saliva and activation of the Th17 inflammatory pathway. As histatin-5 exhibits potent activity against the opportunistic oral pathogen Candida albicans, we evaluated saliva potency against C. albicans ex vivo. Compared to control, patient saliva exhibited significantly reduced anti-candidal efficacy. Although speculative, based on history and salivary analysis we hypothesize that salivary histatin-5 production may be compromised due to SARS-CoV-2 mediated salivary gland destruction. With the current lack of emphasis on implications of COVID-19 on oral health, this report may provide lacking mechanistic insights that may lead to reassessment of risks for oral opportunistic infections and mucosal inflammatory processes in acutely-ill and recovered COVID-19 patients.
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Affiliation(s)
- Areej Alfaifi
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, MD, United States.,Department of Restorative and Prosthetic Dental Sciences, College of Dentistry King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Ahmed S Sultan
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, MD, United States.,Greenebaum Cancer Center, University of Maryland, Baltimore, MD, United States
| | - Daniel Montelongo-Jauregui
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, MD, United States
| | - Timothy F Meiller
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, MD, United States.,Greenebaum Cancer Center, University of Maryland, Baltimore, MD, United States
| | - Mary Ann Jabra-Rizk
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, MD, United States.,Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, United States
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9
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Şenyuva İ, Koca C, Karabag Çoban F, Tarhan Ö. Salivary Histatin 5 Level in Women with Vaginal Candidiasis. Int J Clin Pract 2022; 2022:5279323. [PMID: 35832797 PMCID: PMC9252690 DOI: 10.1155/2022/5279323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 06/06/2022] [Accepted: 06/07/2022] [Indexed: 11/17/2022] Open
Abstract
Histatins (Hsts) are considered a prominent member of antimicrobial peptides rich in histidine, bearing antifungal activity against Candida species. Hst5 is the most effective among them. Although Hst5 is not found in the cervicovaginal fluid, it has been detected in the human serum. Saliva acts as a mirror, reflecting the cause and effect relationship between several diseases. We aimed to show the salivary Hst5 levels with vaginal candidiasis. Women in the reproductive age group (18-50 years) were enrolled in the study. Patients and controls were classified based on the presence or absence of vaginal discharge suggestive of candidiasis, respectively. Vaginal and salivary samples were collected from all the women. Vaginal samples were cultured for the growth of Candida species. Salivary samples were tested by protein electrophoresis to detect Hst5 levels, and the results were compared between the two groups. A total of 80 women were included in this study. The mean age of women in vaginal candidiasis and control groups was 34.25 ± 8.06 and 36.83 ± 7.29 years, respectively. Candida species were isolated from the vaginal samples of the patient group (34 C. albicans, 6 non-Candida albicans) but not from the control group. Hst5 levels in the patient and control group were found to be 0.0571 ± 0.003 ng/mL and 0.0641 ± 0,0031 ng/mL, respectively. Hst5 levels were found to be significantly lower in the vaginal candidiasis group (p=0.001). We conclude that decreased salivary Hst5 levels in women are associated with vaginal candidiasis. Candida infection is a cause or result of lower salivary Hst5 levels, and it may be an important finding for the etiopathogenesis, diagnosis, and treatment of the disease, but further analysis is needed.
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Affiliation(s)
- İrem Şenyuva
- Usak Training and Research Hospital, Department of Obstetrics and Gynecology, Usak, Turkey
| | - Cansu Koca
- University Faculty of Dentistry, Department of Maxillo Facial Surgery, Usak, Turkey
| | | | - Özgür Tarhan
- Usak University, Faculty of Engineering, Department of Food Engineering, Usak, Turkey
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10
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Jadi PK, Sharma P, Bhogapurapu B, Roy S. Alternative Therapeutic Interventions: Antimicrobial Peptides and Small Molecules to Treat Microbial Keratitis. Front Chem 2021; 9:694998. [PMID: 34458234 PMCID: PMC8386189 DOI: 10.3389/fchem.2021.694998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 07/02/2021] [Indexed: 01/10/2023] Open
Abstract
Microbial keratitis is a leading cause of blindness worldwide and results in unilateral vision loss in an estimated 2 million people per year. Bacteria and fungus are two main etiological agents that cause corneal ulcers. Although antibiotics and antifungals are commonly used to treat corneal infections, a clear trend with increasing resistance to these antimicrobials is emerging at rapid pace. Extensive research has been carried out to determine alternative therapeutic interventions, and antimicrobial peptides (AMPs) are increasingly recognized for their clinical potential in treating infections. Small molecules targeted against virulence factors of the pathogens and natural compounds are also explored to meet the challenges and growing demand for therapeutic agents. Here we review the potential of AMPs, small molecules, and natural compounds as alternative therapeutic interventions for the treatment of corneal infections to combat antimicrobial resistance. Additionally, we have also discussed about the different formats of drug delivery systems for optimal administration of drugs to treat microbial keratitis.
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Affiliation(s)
- Praveen Kumar Jadi
- Prof, Brien Holden Eye Research Centre, LV Prasad Eye Institute, Hyderabad, India
| | - Prerana Sharma
- Prof, Brien Holden Eye Research Centre, LV Prasad Eye Institute, Hyderabad, India
- Department of Animal Sciences, University of Hyderabad, Hyderabad, India
| | - Bharathi Bhogapurapu
- Prof, Brien Holden Eye Research Centre, LV Prasad Eye Institute, Hyderabad, India
| | - Sanhita Roy
- Prof, Brien Holden Eye Research Centre, LV Prasad Eye Institute, Hyderabad, India
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11
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Struyfs C, Cammue BPA, Thevissen K. Membrane-Interacting Antifungal Peptides. Front Cell Dev Biol 2021; 9:649875. [PMID: 33912564 PMCID: PMC8074791 DOI: 10.3389/fcell.2021.649875] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 03/09/2021] [Indexed: 12/17/2022] Open
Abstract
The incidence of invasive fungal infections is increasing worldwide, resulting in more than 1.6 million deaths every year. Due to growing antifungal drug resistance and the limited number of currently used antimycotics, there is a clear need for novel antifungal strategies. In this context, great potential is attributed to antimicrobial peptides (AMPs) that are part of the innate immune system of organisms. These peptides are known for their broad-spectrum activity that can be directed toward bacteria, fungi, viruses, and/or even cancer cells. Some AMPs act via rapid physical disruption of microbial cell membranes at high concentrations causing cell leakage and cell death. However, more complex mechanisms are also observed, such as interaction with specific lipids, production of reactive oxygen species, programmed cell death, and autophagy. This review summarizes the structure and mode of action of antifungal AMPs, thereby focusing on their interaction with fungal membranes.
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Affiliation(s)
- Caroline Struyfs
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Bruno P A Cammue
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Karin Thevissen
- Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
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12
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Dijksteel GS, Ulrich MMW, Middelkoop E, Boekema BKHL. Review: Lessons Learned From Clinical Trials Using Antimicrobial Peptides (AMPs). Front Microbiol 2021; 12:616979. [PMID: 33692766 PMCID: PMC7937881 DOI: 10.3389/fmicb.2021.616979] [Citation(s) in RCA: 174] [Impact Index Per Article: 58.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 01/29/2021] [Indexed: 12/15/2022] Open
Abstract
Antimicrobial peptides (AMPs) or host defense peptides protect the host against various pathogens such as yeast, fungi, viruses and bacteria. AMPs also display immunomodulatory properties ranging from the modulation of inflammatory responses to the promotion of wound healing. More interestingly, AMPs cause cell disruption through non-specific interactions with the membrane surface of pathogens. This is most likely responsible for the low or limited emergence of bacterial resistance against many AMPs. Despite the increasing number of antibiotic-resistant bacteria and the potency of novel AMPs to combat such pathogens, only a few AMPs are in clinical use. Therefore, the current review describes (i) the potential of AMPs as alternatives to antibiotics, (ii) the challenges toward clinical implementation of AMPs and (iii) strategies to improve the success rate of AMPs in clinical trials, emphasizing the lessons we could learn from these trials.
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Affiliation(s)
- Gabrielle S Dijksteel
- Association of Dutch Burn Centres, Beverwijk, Netherlands.,Department of Plastic, Reconstructive and Hand Surgery, Amsterdam Movement Sciences, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Magda M W Ulrich
- Association of Dutch Burn Centres, Beverwijk, Netherlands.,Department of Plastic, Reconstructive and Hand Surgery, Amsterdam Movement Sciences, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, Netherlands.,Department of Pathology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Esther Middelkoop
- Association of Dutch Burn Centres, Beverwijk, Netherlands.,Department of Plastic, Reconstructive and Hand Surgery, Amsterdam Movement Sciences, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
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13
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Ok SM, Ho D, Lynd T, Ahn YW, Ju HM, Jeong SH, Cheon K. Candida Infection Associated with Salivary Gland-A Narrative Review. J Clin Med 2020; 10:E97. [PMID: 33396602 PMCID: PMC7795466 DOI: 10.3390/jcm10010097] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 12/21/2020] [Accepted: 12/26/2020] [Indexed: 11/22/2022] Open
Abstract
Candida species are common global opportunistic pathogens that could repeatedly and chronically cause oral mucosa infection and create an inflammatory environment, leading to organ dysfunction. Oral Candida infections may cause temporary or permanent damage to salivary glands, resulting in the destruction of acinar cells and the formation of scar tissue. Restricted function of the salivary glands leads to discomfort and diseases of the oral mucosa, such as dry mouth and associated infection. This narrative review attempts to summarize the anatomy and function of salivary glands, the associations between Candida and saliva, the effects of Candida infection on salivary glands, and the treatment strategies. Overall, clinicians should proactively manage Candida infections by educating patients on oral hygiene management for vulnerable populations, conducting frequent checks for a timely diagnosis, and providing an effective treatment plan.
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Affiliation(s)
- Soo-Min Ok
- Department of Oral Medicine, Dental and Life Science Institute, Pusan National University, Yangsan 50612, Korea; (S.-m.O.); (Y.-W.A.); (H.-M.J.); (S.-H.J.)
- Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea
- Department of Pediatric Dentistry, University of Alabama at Birmingham, Birmingham, AL 35294, USA; (D.H.); (T.L.)
| | - Donald Ho
- Department of Pediatric Dentistry, University of Alabama at Birmingham, Birmingham, AL 35294, USA; (D.H.); (T.L.)
| | - Tyler Lynd
- Department of Pediatric Dentistry, University of Alabama at Birmingham, Birmingham, AL 35294, USA; (D.H.); (T.L.)
| | - Yong-Woo Ahn
- Department of Oral Medicine, Dental and Life Science Institute, Pusan National University, Yangsan 50612, Korea; (S.-m.O.); (Y.-W.A.); (H.-M.J.); (S.-H.J.)
- Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea
| | - Hye-Min Ju
- Department of Oral Medicine, Dental and Life Science Institute, Pusan National University, Yangsan 50612, Korea; (S.-m.O.); (Y.-W.A.); (H.-M.J.); (S.-H.J.)
- Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea
| | - Sung-Hee Jeong
- Department of Oral Medicine, Dental and Life Science Institute, Pusan National University, Yangsan 50612, Korea; (S.-m.O.); (Y.-W.A.); (H.-M.J.); (S.-H.J.)
- Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea
| | - Kyounga Cheon
- Department of Pediatric Dentistry, University of Alabama at Birmingham, Birmingham, AL 35294, USA; (D.H.); (T.L.)
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14
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Zong X, Fu J, Xu B, Wang Y, Jin M. Interplay between gut microbiota and antimicrobial peptides. ANIMAL NUTRITION (ZHONGGUO XU MU SHOU YI XUE HUI) 2020; 6:389-396. [PMID: 33364454 PMCID: PMC7750803 DOI: 10.1016/j.aninu.2020.09.002] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 09/09/2020] [Accepted: 09/14/2020] [Indexed: 12/19/2022]
Abstract
The gut microbiota is comprised of a diverse array of microorganisms that interact with immune system and exert crucial roles for the health. Changes in the gut microbiota composition and functionality are associated with multiple diseases. As such, mobilizing a rapid and appropriate antimicrobial response depending on the nature of each stimulus is crucial for maintaining the balance between homeostasis and inflammation in the gut. Major players in this scenario are antimicrobial peptides (AMP), which belong to an ancient defense system found in all organisms and participate in a preservative co-evolution with a complex microbiome. Particularly increasing interactions between AMP and microbiota have been found in the gut. Here, we focus on the mechanisms by which AMP help to maintain a balanced microbiota and advancing our understanding of the circumstances of such balanced interactions between gut microbiota and host AMP. This review aims to provide a comprehensive overview on the interplay of diverse antimicrobial responses with enteric pathogens and the gut microbiota, which should have therapeutic implications for different intestinal disorders.
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Affiliation(s)
- Xin Zong
- Key Laboratory of Molecular Animal Nutrition, Ministry of Education, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
- Key Laboratory of Animal Nutrition and Feed Science in Eastern China, Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Jie Fu
- Key Laboratory of Molecular Animal Nutrition, Ministry of Education, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
- Key Laboratory of Animal Nutrition and Feed Science in Eastern China, Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Bocheng Xu
- Key Laboratory of Molecular Animal Nutrition, Ministry of Education, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
- Key Laboratory of Animal Nutrition and Feed Science in Eastern China, Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yizhen Wang
- Key Laboratory of Molecular Animal Nutrition, Ministry of Education, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
- Key Laboratory of Animal Nutrition and Feed Science in Eastern China, Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Mingliang Jin
- Key Laboratory of Molecular Animal Nutrition, Ministry of Education, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
- Key Laboratory of Animal Nutrition and Feed Science in Eastern China, Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
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15
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Abstract
Invasive fungal infections in humans are generally associated with high mortality, making the choice of antifungal drug crucial for the outcome of the patient. The limited spectrum of antifungals available and the development of drug resistance represent the main concerns for the current antifungal treatments, requiring alternative strategies. Antimicrobial peptides (AMPs), expressed in several organisms and used as first-line defenses against microbial infections, have emerged as potential candidates for developing new antifungal therapies, characterized by negligible host toxicity and low resistance rates. Most of the current literature focuses on peptides with antibacterial activity, but there are fewer studies of their antifungal properties. This review focuses on AMPs with antifungal effects, including their in vitro and in vivo activities, with the biological repercussions on the fungal cells, when known. The classification of the peptides is based on their mode of action: although the majority of AMPs exert their activity through the interaction with membranes, other mechanisms have been identified, including cell wall inhibition and nucleic acid binding. In addition, antifungal compounds with unknown modes of action are also described. The elucidation of such mechanisms can be useful to identify novel drug targets and, possibly, to serve as the templates for the synthesis of new antimicrobial compounds with increased activity and reduced host toxicity.
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Kunyeit L, K A AA, Rao RP. Application of Probiotic Yeasts on Candida Species Associated Infection. J Fungi (Basel) 2020; 6:jof6040189. [PMID: 32992993 PMCID: PMC7711718 DOI: 10.3390/jof6040189] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 09/18/2020] [Accepted: 09/19/2020] [Indexed: 01/01/2023] Open
Abstract
Superficial and life-threatening invasive Candida infections are a major clinical challenge in hospitalized and immuno-compromised patients. Emerging drug-resistance among Candida species is exacerbated by the limited availability of antifungals and their associated side-effects. In the current review, we discuss the application of probiotic yeasts as a potential alternative/ combination therapy against Candida infections. Preclinical studies have identified several probiotic yeasts that effectively inhibit virulence of Candida species, including Candida albicans, Candida tropicalis, Candida glabrata, Candida parapsilosis, Candida krusei and Candida auris. However, Saccharomyces cerevisiae var. boulardii is the only probiotic yeast commercially available. In addition, clinical studies have further confirmed the in vitro and in vivo activity of the probiotic yeasts against Candida species. Probiotics use a variety of protective mechanisms, including posing a physical barrier, the ability to aggregate pathogens and render them avirulent. Secreted metabolites such as short-chain fatty acids effectively inhibit the adhesion and morphological transition of Candida species. Overall, the probiotic yeasts could be a promising effective alternative or combination therapy for Candida infections. Additional studies would bolster the application of probiotic yeasts.
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Affiliation(s)
- Lohith Kunyeit
- Department of Microbiology and Fermentation Technology, CSIR- Central Food Technological Research Institute (CFTRI), Mysuru 570020, India; (L.K.); (A.K.A.)
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Department of Biology and Biotechnology, Worcester Polytechnic Institute, Worcester, MA 01609, USA
| | - Anu-Appaiah K A
- Department of Microbiology and Fermentation Technology, CSIR- Central Food Technological Research Institute (CFTRI), Mysuru 570020, India; (L.K.); (A.K.A.)
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Reeta P. Rao
- Department of Biology and Biotechnology, Worcester Polytechnic Institute, Worcester, MA 01609, USA
- Correspondence: ; Tel.: +1-508-831-5000
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17
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Mercer DK, O'Neil DA. Innate Inspiration: Antifungal Peptides and Other Immunotherapeutics From the Host Immune Response. Front Immunol 2020; 11:2177. [PMID: 33072081 PMCID: PMC7533533 DOI: 10.3389/fimmu.2020.02177] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 08/10/2020] [Indexed: 12/17/2022] Open
Abstract
The purpose of this review is to describe antifungal therapeutic candidates in preclinical and clinical development derived from, or directly influenced by, the immune system, with a specific focus on antimicrobial peptides (AMP). Although the focus of this review is AMP with direct antimicrobial effects on fungi, we will also discuss compounds with direct antifungal activity, including monoclonal antibodies (mAb), as well as immunomodulatory molecules that can enhance the immune response to fungal infection, including immunomodulatory AMP, vaccines, checkpoint inhibitors, interferon and colony stimulating factors as well as immune cell therapies. The focus of this manuscript will be a non-exhaustive review of antifungal compounds in preclinical and clinical development that are based on the principles of immunology and the authors acknowledge the incredible amount of in vitro and in vivo work that has been conducted to develop such therapeutic candidates.
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18
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Recognition of Candida albicans and Role of Innate Type 17 Immunity in Oral Candidiasis. Microorganisms 2020; 8:microorganisms8091340. [PMID: 32887412 PMCID: PMC7563233 DOI: 10.3390/microorganisms8091340] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 09/01/2020] [Accepted: 09/01/2020] [Indexed: 02/07/2023] Open
Abstract
Candida albicans is an opportunistic pathogenic fungus considered to be a common member of the human microflora. Similar to some other opportunistic microbes, C. albicans can invade and benefit from its host when the immune status of that host is weakened. Most often this happens to immunocompromised individuals, leading to the infection of oral and vaginal mucosae or the systemic spread of the pathogen throughout the entire body. Oropharyngeal candidiasis (OPC) occurs in up to 90 percent of patients with acquired immunodeficiency syndrome (AIDS), making it the most frequent opportunistic infection for this group. Upon first signs of fungal invasion, a range of host signaling activates in order to eliminate the threat. Epithelial and myeloid type cells detect C. albicans mainly through receptor tyrosine kinases and pattern-recognition receptors. This review provides an overview of downstream signaling resulting in an adequate immune response through the activation of various transcription factors. The study discusses recent advances in research of the interleukin-17 (IL-17) producing innate cells, including natural T helper 17 (nTh17) cells, γδ T cells, invariant natural killer T (iNKT) cells and type 3 innate lymphoid cells (ILC3) that are involved in response to oral C. albicans infections.
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Affiliation(s)
- Taissa Vila
- Department of Oncology and Diagnostic Sciences, Dental School, University of Maryland, Baltimore, United States of America
- * E-mail:
| | - Alexandra M. Rizk
- Department of Oncology and Diagnostic Sciences, Dental School, University of Maryland, Baltimore, United States of America
| | - Ahmed S. Sultan
- Department of Oncology and Diagnostic Sciences, Dental School, University of Maryland, Baltimore, United States of America
| | - Mary Ann Jabra-Rizk
- Department of Oncology and Diagnostic Sciences, Dental School, University of Maryland, Baltimore, United States of America
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, United States of America
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20
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Ray SC, Rappleye CA. Flying under the radar: Histoplasma capsulatum avoidance of innate immune recognition. Semin Cell Dev Biol 2019; 89:91-98. [PMID: 29551572 PMCID: PMC6150853 DOI: 10.1016/j.semcdb.2018.03.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Accepted: 03/14/2018] [Indexed: 10/17/2022]
Abstract
The dimorphic fungal pathogen Histoplasma capsulatum takes advantage of the innate immune system, utilizing host macrophages as a proliferative niche while largely avoiding stimulation of signaling host receptors. As a result, innate immune cells are unable to control H. capsulatum on their own. Not all host phagocytes respond to H. capsulatum in the same way, with neutrophils and dendritic cells playing important roles in impeding fungal growth and initiating a protective TH1 response, respectively. Dendritic cells prime T-cell differentiation after internalization of yeasts via VLA-5 receptors and subsequent degradation of the yeasts. Dendritic cell-expressed TLR7 and TLR9 promote a type I interferon response for TH1 polarization. In contrast to dendritic cells, macrophages provide a hospitable intracellular environment. H. capsulatum yeasts enter macrophages via binding to phagocytic receptors. Simultaneously, α-glucan masks immunostimulatory cell wall β-glucans and a secreted endoglucanase removes exposed β-glucans to minimize recognition of yeasts by Dectin-1. This review highlights how phagocytes interact with H. capsulatum yeasts and the mechanisms H. capsulatum uses to limit the innate immune response.
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21
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Iron Chelator Deferasirox Reduces Candida albicans Invasion of Oral Epithelial Cells and Infection Levels in Murine Oropharyngeal Candidiasis. Antimicrob Agents Chemother 2019; 63:AAC.02152-18. [PMID: 30718249 DOI: 10.1128/aac.02152-18] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 01/25/2019] [Indexed: 12/24/2022] Open
Abstract
Candida albicans, the causative agent of mucosal infections, including oropharyngeal candidiasis (OPC), as well as bloodstream infections, is becoming increasingly resistant to existing treatment options. In the absence of novel drug candidates, drug repurposing aimed at using existing drugs to treat off-label diseases is a promising strategy. C. albicans requires environmental iron for survival and virulence, while host nutritional immunity deploys iron-binding proteins to sequester iron and reduce fungal growth. Here we evaluated the role of iron limitation using deferasirox (an FDA-approved iron chelator for the treatment of patients with iron overload) during murine OPC and assessed deferasirox-treated C. albicans for its interaction with human oral epithelial (OE) cells, neutrophils, and antimicrobial peptides. Therapeutic deferasirox treatment significantly reduced salivary iron levels, while a nonsignificant reduction in the fungal burden was observed. Preventive treatment that allowed for two additional days of drug administration in our murine model resulted in a significant reduction in the number of C. albicans CFU per gram of tongue tissue, a significant reduction in salivary iron levels, and significantly reduced neutrophil-mediated inflammation. C. albicans cells harvested from the tongues of animals undergoing preventive treatment had the differential expression of 106 genes, including those involved in iron metabolism, adhesion, and the response to host innate immunity. Moreover, deferasirox-treated C. albicans cells had a 2-fold reduction in survival in neutrophil phagosomes (with greater susceptibility to oxidative stress) and reduced adhesion to and invasion of OE cells in vitro Thus, deferasirox treatment has the potential to alleviate OPC by affecting C. albicans gene expression and reducing virulence.
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Neelabh, Singh K, Rani J. Sequential and Structural Aspects of Antifungal Peptides from Animals, Bacteria and Fungi Based on Bioinformatics Tools. Probiotics Antimicrob Proteins 2018; 8:85-101. [PMID: 27060002 DOI: 10.1007/s12602-016-9212-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Emerging drug resistance varieties and hyper-virulent strains of microorganisms have compelled the scientific fraternity to develop more potent and less harmful therapeutics. Antimicrobial peptides could be one of such therapeutics. This review is an attempt to explore antifungal peptides naturally produced by prokaryotes as well as eukaryotes. They are components of innate immune system providing first line of defence against microbial attacks, especially in eukaryotes. The present article concentrates on types, structures, sources and mode of action of gene-encoded antifungal peptides such as mammalian defensins, protegrins, tritrpticins, histatins, lactoferricins, antifungal peptides derived from birds, amphibians, insects, fungi, bacteria and their synthetic analogues such as pexiganan, omiganan, echinocandins and Novexatin. In silico drug designing, a major revolution in the area of therapeutics, facilitates drug development by exploiting different bioinformatics tools. With this view, bioinformatics tools were used to visualize the structural details of antifungal peptides and to predict their level of similarity. Current practices and recent developments in this area have also been discussed briefly.
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Affiliation(s)
- Neelabh
- Department of Zoology (MMV), Banaras Hindu University, Varanasi, 221005, India
| | - Karuna Singh
- Department of Zoology (MMV), Banaras Hindu University, Varanasi, 221005, India.
| | - Jyoti Rani
- Department of Zoology (MMV), Banaras Hindu University, Varanasi, 221005, India
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Pólvora TLS, Nobre ÁVV, Tirapelli C, Taba M, Macedo LDD, Santana RC, Pozzetto B, Lourenço AG, Motta ACF. Relationship between human immunodeficiency virus (HIV-1) infection and chronic periodontitis. Expert Rev Clin Immunol 2018; 14:315-327. [PMID: 29595347 DOI: 10.1080/1744666x.2018.1459571] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
INTRODUCTION Current studies show that, even in the era of antiretroviral therapies, HIV-1 infection is associated with more severe and frequent refractory chronic periodontitis. Areas covered: This review, based on a systematic analysis of the literature, intends to provide an update on factors that may be involved in the pathogenesis of periodontal disease in HIV-1-infected patients, including local immunosuppression, oral microbial factors, systemic inflammation, salivary markers, and the role of gingival tissue as a possible reservoir of HIV-1. Expert commentary: The therapeutic revolution of ART made HIV-1 infection a chronic controllable disease, reduced HIV-1 mortality rate, restored at least partially the immune response and dramatically increased life expectancy of HIV-1-infected patients. Despite all these positive aspects, chronic periodontitis assumes an important role in the HIV-1 infection status for activating systemic inflammation favoring viral replication and influencing HIV-1 status, and also acting as a possible reservoir of HIV-1. All these issues still need to be clarified and validated, but have important clinical implications that certainly will benefit the diagnosis and management of chronic periodontitis in HIV-1-infected patients, and also contributes to HIV-1 eradication.
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Affiliation(s)
| | - Átila Vinícius V Nobre
- b Department of Oral & Maxillofacial Surgery, and Periodontology, School of Dentistry of Ribeirão Preto , University of São Paulo , Ribeirão Preto , Brazil
| | - Camila Tirapelli
- c Department of Dental Material and Prosthesis, School of Dentistry of Ribeirão Preto , USP - University of São Paulo , Ribeirão Preto , Brazil
| | - Mário Taba
- b Department of Oral & Maxillofacial Surgery, and Periodontology, School of Dentistry of Ribeirão Preto , University of São Paulo , Ribeirão Preto , Brazil
| | - Leandro Dorigan de Macedo
- d Division of Dentistry and Stomatology, Clinical Hospital, Ribeirão Preto Medical School , University of São Paulo , Ribeirão Preto , Brazil
| | - Rodrigo Carvalho Santana
- e Department of Internal Medicine, Ribeirão Preto Medical School , USP - University of São Paulo , Ribeirão Preto , Brazil
| | - Bruno Pozzetto
- f GIMAP EA 3064 (Groupe Immunité des Muqueuses et Agents Pathogènes) , University of Lyon , Saint-Etienne , France
| | - Alan Grupioni Lourenço
- g Department of Stomatology, Public Oral Health and Forensic Dentistry, School of Dentistry of Ribeirão Preto , University of São Paulo , Ribeirão Preto , Brazil
| | - Ana Carolina F Motta
- g Department of Stomatology, Public Oral Health and Forensic Dentistry, School of Dentistry of Ribeirão Preto , University of São Paulo , Ribeirão Preto , Brazil
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Hünniger K, Kurzai O. Phagocytes as central players in the defence against invasive fungal infection. Semin Cell Dev Biol 2018; 89:3-15. [PMID: 29601862 DOI: 10.1016/j.semcdb.2018.03.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2017] [Accepted: 03/26/2018] [Indexed: 12/23/2022]
Abstract
Fungal pathogens cause severe and life-threatening infections worldwide. The majority of invasive infections occurs in immunocompromised patients and is based on acquired as well as congenital defects of innate and adaptive immune responses. In many cases, these defects affect phagocyte functions. Consequently, professional phagocytes - mainly monocytes, macrophages, dendritic cells and polymorphonuclear neutrophilic granulocytes - have been shown to act as central players in initiating and modulating antifungal immune responses as well as elimination of fungal pathogens. In this review we will summarize our current understanding on the role of these professional phagocytes in invasive fungal infection to emphasize two important aspects. (i) Analyses on the interaction between fungi and phagocytes have contributed to significant new insights into phagocyte biology. Important examples for this include the identification of pattern recognition receptors for β-glucan, a major cell wall component of many fungal pathogens, as well as the identification of genetic polymorphisms that determine individual host responses towards invading fungi. (ii) At the same time it was shown that fungal pathogens have evolved sophisticated mechanisms to counteract the attack of professional phagocytes. These mechanisms range from complete mechanical destruction of phagocytes to exquisite adaptation of some fungi to the hostile intracellular environment, enabling them to grow and replicate inside professional phagocytes.
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Affiliation(s)
- Kerstin Hünniger
- Institute for Hygiene and Microbiology, University of Würzburg, Germany; Septomics Research Center, Leibniz Institute for Natural Product Research and Infection Biology - Hans-Knoell-Institute, Jena, Germany
| | - Oliver Kurzai
- Institute for Hygiene and Microbiology, University of Würzburg, Germany; Septomics Research Center, Leibniz Institute for Natural Product Research and Infection Biology - Hans-Knoell-Institute, Jena, Germany.
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25
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Pachón-Ibáñez ME, Smani Y, Pachón J, Sánchez-Céspedes J. Perspectives for clinical use of engineered human host defense antimicrobial peptides. FEMS Microbiol Rev 2018; 41:323-342. [PMID: 28521337 PMCID: PMC5435762 DOI: 10.1093/femsre/fux012] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 02/28/2017] [Indexed: 12/15/2022] Open
Abstract
Infectious diseases caused by bacteria, viruses or fungi are among the leading causes of death worldwide. The emergence of drug-resistance mechanisms, especially among bacteria, threatens the efficacy of all current antimicrobial agents, some of them already ineffective. As a result, there is an urgent need for new antimicrobial drugs. Host defense antimicrobial peptides (HDPs) are natural occurring and well-conserved peptides of innate immunity, broadly active against Gram-negative and Gram-positive bacteria, viruses and fungi. They also are able to exert immunomodulatory and adjuvant functions by acting as chemotactic for immune cells, and inducing cytokines and chemokines secretion. Moreover, they show low propensity to elicit microbial adaptation, probably because of their non-specific mechanism of action, and are able to neutralize exotoxins and endotoxins. HDPs have the potential to be a great source of novel antimicrobial agents. The goal of this review is to provide an overview of the advances made in the development of human defensins as well as the cathelicidin LL-37 and their derivatives as antimicrobial agents against bacteria, viruses and fungi for clinical use.
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Affiliation(s)
- María Eugenia Pachón-Ibáñez
- Clinical Unit of Infectious Diseases, Microbiology and Preventive Medicine, Institute of Biomedicine of Seville (IBiS), University Hospital Virgen del Rocío/CSIC/University of Seville
| | - Younes Smani
- Clinical Unit of Infectious Diseases, Microbiology and Preventive Medicine, Institute of Biomedicine of Seville (IBiS), University Hospital Virgen del Rocío/CSIC/University of Seville
| | - Jerónimo Pachón
- Clinical Unit of Infectious Diseases, Microbiology and Preventive Medicine, Institute of Biomedicine of Seville (IBiS), University Hospital Virgen del Rocío/CSIC/University of Seville.,Department of Medicine, University of Seville, Seville, Spain
| | - Javier Sánchez-Céspedes
- Clinical Unit of Infectious Diseases, Microbiology and Preventive Medicine, Institute of Biomedicine of Seville (IBiS), University Hospital Virgen del Rocío/CSIC/University of Seville.,Department of Medicine, University of Seville, Seville, Spain
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Laputková G, Schwartzová V, Bánovčin J, Alexovič M, Sabo J. Salivary Protein Roles in Oral Health and as Predictors of Caries Risk. Open Life Sci 2018; 13:174-200. [PMID: 33817083 PMCID: PMC7874700 DOI: 10.1515/biol-2018-0023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Accepted: 02/13/2018] [Indexed: 12/13/2022] Open
Abstract
This work describes the current state of research on the potential relationship between protein content in human saliva and dental caries, which remains among the most common oral diseases and causes irreversible damage in the oral cavity. An understanding the whole saliva proteome in the oral cavity could serve as a prerequisite to obtaining insight into the etiology of tooth decay at early stages. To date, however, there is no comprehensive evidence showing that salivary proteins could serve as potential indicators for the early diagnosis of the risk factors causing dental caries. Therefore, proteomics indicates the promising direction of future investigations of such factors, including diagnosis and thus prevention in dental therapy.
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Affiliation(s)
- Galina Laputková
- Department of Medical and Clinical Biophysics, Faculty of Medicine, University of P. J. Šafárik in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Vladimíra Schwartzová
- 1st Department of Stomatology, Faculty of Medicine, University of P. J. Šafárik in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Juraj Bánovčin
- Department of Stomatology and Maxillofacial Surgery, Faculty of Medicine, University of P. J. Šafárik in Košice, Rastislavova 43, Košice, 041 90, Slovakia
| | - Michal Alexovič
- Department of Medical and Clinical Biophysics, Faculty of Medicine, University of P. J. Šafárik in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
| | - Ján Sabo
- Department of Medical and Clinical Biophysics, Faculty of Medicine, University of P. J. Šafárik in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
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Mohammed I, Said DG, Dua HS. Human antimicrobial peptides in ocular surface defense. Prog Retin Eye Res 2017; 61:1-22. [DOI: 10.1016/j.preteyeres.2017.03.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 03/22/2017] [Accepted: 03/27/2017] [Indexed: 01/17/2023]
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Abstract
AbstractBackground: Dental caries disease is a dynamic process with a multi-factorial etiology. It is manifested by demineralization of enamel followed by damage spreading into the tooth inner structure. Successful early diagnosis could identify caries-risk and improve dental screening, providing a baseline for evaluating personalized dental treatment and prevention strategies. Methodology: Salivary proteome of the whole unstimulated saliva (WUS) samples was assessed in caries-free and caries-susceptible individuals of older adolescent age with permanent dentition using a nano-HPLC and MALDI-TOF/TOF mass spectrometry. Results: 554 proteins in the caries-free and 695 proteins in the caries-susceptible group were identified. Assessment using bioinformatics tools and Gene Ontology (GO) term enrichment analysis revealed qualitative differences between these two proteomes. Members of the caries-susceptible group exhibited a branch of cytokine binding gene products responsible for the regulation of immune and inflammatory responses to infections. Inspection of molecular functions and biological processes of caries-susceptible saliva samples revealed significant categories predominantly related to the activity of proteolytic peptidases, and the regulation of metabolic and catabolic processes of carbohydrates. Conclusions: Proteomic analysis of the whole saliva revealed information about potential risk factors associated with the development of caries-susceptibility and provides a better understanding of tooth protection mechanisms.
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Menzel LP, Chowdhury HM, Masso-Silva JA, Ruddick W, Falkovsky K, Vorona R, Malsbary A, Cherabuddi K, Ryan LK, DiFranco KM, Brice DC, Costanzo MJ, Weaver D, Freeman KB, Scott RW, Diamond G. Potent in vitro and in vivo antifungal activity of a small molecule host defense peptide mimic through a membrane-active mechanism. Sci Rep 2017; 7:4353. [PMID: 28659617 PMCID: PMC5489528 DOI: 10.1038/s41598-017-04462-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 05/17/2017] [Indexed: 12/28/2022] Open
Abstract
Lethal systemic fungal infections of Candida species are increasingly common, especially in immune compromised patients. By in vitro screening of small molecule mimics of naturally occurring host defense peptides (HDP), we have identified several active antifungal molecules, which also exhibited potent activity in two mouse models of oral candidiasis. Here we show that one such compound, C4, exhibits a mechanism of action that is similar to the parent HDP upon which it was designed. Specifically, its initial interaction with the anionic microbial membrane is electrostatic, as its fungicidal activity is inhibited by cations. We observed rapid membrane permeabilization to propidium iodide and ATP efflux in response to C4. Unlike the antifungal peptide histatin 5, it did not require energy-dependent transport across the membrane. Rapid membrane disruption was observed by both fluorescence and electron microscopy. The compound was highly active in vitro against numerous fluconazole-resistant clinical isolates of C. albicans and non-albicans species, and it exhibited potent, dose-dependent activity in a mouse model of invasive candidiasis, reducing kidney burden by three logs after 24 hours, and preventing mortality for up to 17 days. Together the results support the development of this class of antifungal drug to treat invasive candidiasis.
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Affiliation(s)
- Lorenzo P Menzel
- Department of Oral Biology, University of Florida, Gainesville, FL, 32610, USA
| | | | - Jorge Adrian Masso-Silva
- Graduate School of Biomedical Sciences, New Jersey Medical School, Rutgers, Newark, NJ, 07101, USA
| | - William Ruddick
- Department of Oral Biology, University of Florida, Gainesville, FL, 32610, USA
| | - Klaudia Falkovsky
- Department of Oral Biology, New Jersey Dental School, Rutgers, Newark, NJ, 07101, USA
| | - Rafael Vorona
- Department of Oral Biology, University of Florida, Gainesville, FL, 32610, USA
| | - Andrew Malsbary
- Department of Oral Biology, New Jersey Dental School, Rutgers, Newark, NJ, 07101, USA
| | - Kartikeya Cherabuddi
- Division of Infectious Diseases and Global Medicine, Department of Medicine, University of Florida College of Medicine, Gainesville, FL, 32610, USA
| | - Lisa K Ryan
- Division of Infectious Diseases and Global Medicine, Department of Medicine, University of Florida College of Medicine, Gainesville, FL, 32610, USA
| | - Kristina M DiFranco
- Department of Oral Biology, University of Florida, Gainesville, FL, 32610, USA
| | - David C Brice
- Department of Oral Biology, University of Florida, Gainesville, FL, 32610, USA
| | | | - Damian Weaver
- Fox Chase Chemical Diversity Center, Doylestown, PA, USA
| | | | | | - Gill Diamond
- Department of Oral Biology, University of Florida, Gainesville, FL, 32610, USA.
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Abstract
Antimicrobial peptides (AMPs) are expressed in various living organisms as first-line host defenses against potential harmful encounters in their surroundings. AMPs are short polycationic peptides exhibiting various antimicrobial activities. The principal antibacterial activity is attributed to the membrane-lytic mechanism which directly interferes with the integrity of the bacterial cell membrane and cell wall. In addition, a number of AMPs form a transmembrane channel in the membrane by self-aggregation or polymerization, leading to cytoplasm leakage and cell death. However, an increasing body of evidence has demonstrated that AMPs are able to exert intracellular inhibitory activities as the primary or supportive mechanisms to achieve efficient killing. In this review, we focus on the major intracellular targeting activities reported in AMPs, which include nucleic acids and protein biosynthesis and protein-folding, protease, cell division, cell wall biosynthesis, and lipopolysaccharide inhibition. These multifunctional AMPs could serve as the potential lead peptides for the future development of novel antibacterial agents with improved therapeutic profiles.
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Rajasekaran S, Tangavel C, Aiyer SN, Nayagam SM, Raveendran M, Demonte NL, Subbaiah P, Kanna R, Shetty AP, Dharmalingam K. ISSLS PRIZE IN CLINICAL SCIENCE 2017: Is infection the possible initiator of disc disease? An insight from proteomic analysis. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2017; 26:1384-1400. [PMID: 28168343 DOI: 10.1007/s00586-017-4972-3] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2017] [Accepted: 01/22/2017] [Indexed: 12/19/2022]
Abstract
STUDY DESIGN Proteomic and 16S rDNA analysis of disc tissues obtained in vivo. OBJECTIVE To address the controversy of infection as an aetiology for disc disorders through protein profiling. There is raging controversy over the presence of bacteria in human lumbar discs in vivo, and if they represent contamination or infection. Proteomics can provide valuable insight by identifying proteins signifying bacterial presence and, also host defence response proteins (HDRPs), which will confirm infection. METHODS 22 discs (15-disc herniations (DH), 5-degenerate (DD), 2-normal in MRI (NM) were harvested intraoperatively and immediately snap frozen. Samples were pooled into three groups and proteins extracted were analysed with liquid chromatography-tandem mass spectrometry (LC-MS/MS). Post identification, data analysis was performed using Uniprotdb, Pantherdb, Proteome discoverer and STRING network. Authentication for bacterial presence was performed by PCR amplification of 16S rDNA. RESULTS LC-MS/MS analysis using Orbitrap showed 1103 proteins in DH group, compared to 394 in NM and 564 in DD. 73 bacterial specific proteins were identified (56 specific for Propionibacterium acnes; 17 for Staphylococcus epidermidis). In addition, 67 infection-specific HDRPs, unique or upregulated, such as Defensin, Lysozyme, Dermcidin, Cathepsin-G, Prolactin-Induced Protein, and Phospholipase-A2, were identified confirming presence of infection. Species-specific primers for P. acnes exhibited amplicons at 946 bp (16S rDNA) and 515 bp (Lipase) confirming presence of P. acnes in both NM discs, 11 of 15 DH discs, and all five DD discs. Bioinformatic search for protein-protein interactions (STRING) documented 169 proteins with close interactions (protein clustering co-efficient 0.7) between host response and degenerative proteins implying that infection may initiate degradation through Ubiquitin C. CONCLUSION Our study demonstrates bacterial specific proteins and host defence proteins to infection which strengthen the hypothesis of infection as a possible initiator of disc disease. These results can lead to a paradigm shift in our understanding and management of disc disorders.
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Affiliation(s)
- S Rajasekaran
- Department of Spine Surgery, Ganga Hospital, 313, Mettuppalayam Road, Coimbatore, 641043, India.
| | - Chitraa Tangavel
- Ganga Research Centre, No 91, Mettuppalayam Road, Coimbatore, 641030, India
| | - Siddharth N Aiyer
- Department of Spine Surgery, Ganga Hospital, 313, Mettuppalayam Road, Coimbatore, 641043, India
| | | | - M Raveendran
- Department of Plant Biotechnology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
| | | | - Pramela Subbaiah
- Department of Spine Surgery, Ganga Hospital, 313, Mettuppalayam Road, Coimbatore, 641043, India
| | - Rishi Kanna
- Department of Spine Surgery, Ganga Hospital, 313, Mettuppalayam Road, Coimbatore, 641043, India
| | - Ajoy Prasad Shetty
- Department of Spine Surgery, Ganga Hospital, 313, Mettuppalayam Road, Coimbatore, 641043, India
| | - K Dharmalingam
- Aravind Medical Research Foundation, Madurai, 625020, India
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Nagao JI, Cho T, Mitarai M, Iohara K, Hayama K, Abe S, Tanaka Y. Antifungal activity in vitro and in vivo of a salmon protamine peptide and its derived cyclic peptide against Candida albicans. FEMS Yeast Res 2016; 17:fow099. [PMID: 27915244 DOI: 10.1093/femsyr/fow099] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Revised: 09/20/2016] [Accepted: 11/23/2016] [Indexed: 11/12/2022] Open
Abstract
Protamine peptide (PP) derived from salmon is a 14-mer with 10 arginine residues. We investigated the in vitro and in vivo antifungal activity of PP against Candida albicans PP showed a concentration-dependent dual mode of action, with fungicidal activity and inhibitory activity for hyphal development in vitro. At lethal concentrations of PP, intracellular accumulation of PP was energy-dependent but independent of endocytosis, and resulted in ATP efflux and the generation of reactive oxygen species in the cells. PP at sublethal concentrations inhibited hyphal development in C. albicans by binding to the cell surface. Though antifungal activity of PP was inactivated by high concentrations of NaCl, the antifungal activity of the synthetic cyclic (via a disulfide bond) form of PP (cyclic PP) was not. Cyclic PP also showed the concentration-dependent dual mode of action, and had five-fold greater antifungal activity than PP. The advantage of antifungal activity of cyclic PP compared with PP in vitro resulted in a high in vivo efficacy in a murine oral candidiasis model. Oral treatment with cyclic PP inhibited hyphal development of C. albicans on mouse tongues and protected against the development of severe candidiasis. This study shows the therapeutic potential of cyclic PP as an antifungal peptide against C. albicans.
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Affiliation(s)
- Jun-Ichi Nagao
- Section of Infection Biology, Department of Functional Bioscience, Fukuoka Dental College, 2-15-1 Tamura, Sawara-ku, Fukuoka 814-0193, Japan
| | - Tamaki Cho
- Section of Infection Biology, Department of Functional Bioscience, Fukuoka Dental College, 2-15-1 Tamura, Sawara-ku, Fukuoka 814-0193, Japan
| | - Makoto Mitarai
- Central Research Institute, Maruha Nichiro Corporation, 16-2, Wadai, Tsukuba-City, Ibaraki, 300-4295, Japan
| | - Keishi Iohara
- Central Research Institute, Maruha Nichiro Corporation, 16-2, Wadai, Tsukuba-City, Ibaraki, 300-4295, Japan
| | - Kazumi Hayama
- Teikyo University institute of Medical Mycology, 3590 Otsuka, Hachioji, Tokyo, 192-0395, Japan
| | - Shigeru Abe
- Teikyo University institute of Medical Mycology, 3590 Otsuka, Hachioji, Tokyo, 192-0395, Japan
| | - Yoshihiko Tanaka
- Section of Infection Biology, Department of Functional Bioscience, Fukuoka Dental College, 2-15-1 Tamura, Sawara-ku, Fukuoka 814-0193, Japan
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Characterization of the antimicrobial peptide family defensins in the Tasmanian devil (Sarcophilus harrisii), koala (Phascolarctos cinereus), and tammar wallaby (Macropus eugenii). Immunogenetics 2016; 69:133-143. [PMID: 27838759 DOI: 10.1007/s00251-016-0959-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Accepted: 11/05/2016] [Indexed: 12/21/2022]
Abstract
Defensins comprise a family of cysteine-rich antimicrobial peptides with important roles in innate and adaptive immune defense in vertebrates. We characterized alpha and beta defensin genes in three Australian marsupials: the Tasmanian devil (Sarcophilus harrisii), koala (Phascolarctos cinereus), and tammar wallaby (Macropus eugenii) and identified 48, 34, and 39 defensins, respectively. One hundred and twelve have the classical antimicrobial peptides characteristics required for pathogen membrane targeting, including cationic charge (between 1+ and 15+) and a high proportion of hydrophobic residues (>30%). Phylogenetic analysis shows that gene duplication has driven unique and species-specific expansions of devil, koala, and tammar wallaby beta defensins and devil alpha defensins. Defensin genes are arranged in three genomic clusters in marsupials, whereas further duplications and translocations have occurred in eutherians resulting in four and five gene clusters in mice and humans, respectively. Marsupial defensins are generally under purifying selection, particularly residues essential for defensin structural stability. Certain hydrophobic or positively charged sites, predominantly found in the defensin loop, are positively selected, which may have functional significance in defensin-target interaction and membrane insertion.
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Conti HR, Bruno VM, Childs EE, Daugherty S, Hunter JP, Mengesha BG, Saevig DL, Hendricks MR, Coleman BM, Brane L, Solis N, Cruz JA, Verma AH, Garg AV, Hise AG, Richardson JP, Naglik JR, Filler SG, Kolls JK, Sinha S, Gaffen SL. IL-17 Receptor Signaling in Oral Epithelial Cells Is Critical for Protection against Oropharyngeal Candidiasis. Cell Host Microbe 2016; 20:606-617. [PMID: 27923704 DOI: 10.1016/j.chom.2016.10.001] [Citation(s) in RCA: 126] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Revised: 08/16/2016] [Accepted: 09/21/2016] [Indexed: 12/19/2022]
Abstract
Signaling through the IL-17 receptor (IL-17R) is required to prevent oropharyngeal candidiasis (OPC) in mice and humans. However, the IL-17-responsive cell type(s) that mediate protection are unknown. Using radiation chimeras, we were able to rule out a requirement for IL-17RA in the hematopoietic compartment. We saw remarkable concordance of IL-17-controlled gene expression in C. albicans-infected human oral epithelial cells (OECs) and in tongue tissue from mice with OPC. To interrogate the role of the IL-17R in OECs, we generated mice with conditional deletion of IL-17RA in superficial oral and esophageal epithelial cells (Il17raΔK13). Following oral Candida infection, Il17raΔK13 mice exhibited fungal loads and weight loss indistinguishable from Il17ra-/- mice. Susceptibility in Il17raΔK13 mice correlated with expression of the antimicrobial peptide β-defensin 3 (BD3, Defb3). Consistently, Defb3-/- mice were susceptible to OPC. Thus, OECs dominantly control IL-17R-dependent responses to OPC through regulation of BD3 expression.
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Affiliation(s)
- Heather R Conti
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA 15261, USA; Department of Biological Sciences, University of Toledo, Toledo, OH 43606, USA.
| | - Vincent M Bruno
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Erin E Childs
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Sean Daugherty
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Joseph P Hunter
- Department of Biological Sciences, University of Toledo, Toledo, OH 43606, USA
| | - Bemnet G Mengesha
- Department of Biological Sciences, University of Toledo, Toledo, OH 43606, USA
| | - Danielle L Saevig
- Department of Biological Sciences, University of Toledo, Toledo, OH 43606, USA
| | - Matthew R Hendricks
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Bianca M Coleman
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Lucas Brane
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Norma Solis
- Division of Infectious Diseases, Los Angeles Biomedical Research Institute, Harbor-UCLA Medical Center, Torrance, CA 90502, USA
| | - J Agustin Cruz
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Akash H Verma
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Abhishek V Garg
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Amy G Hise
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA; Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH 44106, USA
| | - Jonathan P Richardson
- Department of Mucosal and Salivary Biology, King's College London, London SE1 1UL, UK
| | - Julian R Naglik
- Department of Mucosal and Salivary Biology, King's College London, London SE1 1UL, UK
| | - Scott G Filler
- Division of Infectious Diseases, Los Angeles Biomedical Research Institute, Harbor-UCLA Medical Center, Torrance, CA 90502, USA
| | - Jay K Kolls
- Richard King Mellon Foundation for Pediatric Research, Children's Hospital of UPMC, Pittsburgh, PA 15224, USA
| | - Satrajit Sinha
- Department of Biochemistry, University at Buffalo, State University of New York, Buffalo, NY 14203, USA
| | - Sarah L Gaffen
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA 15261, USA; Department of Mucosal and Salivary Biology, King's College London, London SE1 1UL, UK.
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Galleria mellonella lysozyme induces apoptotic changes in Candida albicans cells. Microbiol Res 2016; 193:121-131. [PMID: 27825480 DOI: 10.1016/j.micres.2016.10.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 09/30/2016] [Accepted: 10/08/2016] [Indexed: 12/22/2022]
Abstract
The greater wax moth Galleria mellonella has been increasingly used as a model host to determine Candida albicans virulence and efficacy of antifungal treatment. The G. mellonella lysozyme, similarly to its human counterpart, is a member of the c-type family of lysozymes that exhibits antibacterial and antifungal activity. However, in contrast to the relatively well explained bactericidal action, the mechanism of fungistatic and/or fungicidal activity of lysozymes is still not clear. In the present study we provide the direct evidences that the G. mellonella lysozyme binds to the protoplasts as well as to the intact C. albicans cells and decreases the survival rate of both these forms in a time-dependent manner. No enzymatic activity of the lysozyme towards typical chitinase and β-glucanase substrates was detected, indicating that hydrolysis of main fungal cell wall components is not responsible for anti-Candida activity of the lysozyme. On the other hand, pre-treatment of cells with tetraethylammonium, a potassium channel blocker, prevented them from the lysozyme action, suggesting that lysozyme acts by induction of programmed cell death. In fact, the C. albicans cells treated with the lysozyme exhibited typical apoptotic features, i.e. loss of mitochondrial membrane potential, phosphatidylserine exposure in the outer leaflet of the cell membrane, as well as chromatin condensation and DNA fragmentation.
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Whibley N, Tritto E, Traggiai E, Kolbinger F, Moulin P, Brees D, Coleman BM, Mamo AJ, Garg AV, Jaycox JR, Siebenlist U, Kammüller M, Gaffen SL. Antibody blockade of IL-17 family cytokines in immunity to acute murine oral mucosal candidiasis. J Leukoc Biol 2016; 99:1153-64. [PMID: 26729813 PMCID: PMC4952011 DOI: 10.1189/jlb.4a0915-428r] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 11/16/2015] [Accepted: 12/14/2015] [Indexed: 12/13/2022] Open
Abstract
Antibodies targeting IL-17A or its receptor, IL-17RA, are approved to treat psoriasis and are being evaluated for other autoimmune conditions. Conversely, IL-17 signaling is critical for immunity to opportunistic mucosal infections caused by the commensal fungus Candida albicans, as mice and humans lacking the IL-17R experience chronic mucosal candidiasis. IL-17A, IL-17F, and IL-17AF bind the IL-17RA-IL-17RC heterodimeric complex and deliver qualitatively similar signals through the adaptor Act1. Here, we used a mouse model of acute oropharyngeal candidiasis to assess the impact of blocking IL-17 family cytokines compared with specific IL-17 cytokine gene knockout mice. Anti-IL-17A antibodies, which neutralize IL-17A and IL-17AF, caused elevated oral fungal loads, whereas anti-IL-17AF and anti-IL-17F antibodies did not. Notably, there was a cooperative effect of blocking IL-17A, IL-17AF, and IL-17F together. Termination of anti-IL-17A treatment was associated with rapid C. albicans clearance. IL-17F-deficient mice were fully resistant to oropharyngeal candidiasis, consistent with antibody blockade. However, IL-17A-deficient mice had lower fungal burdens than anti-IL-17A-treated mice. Act1-deficient mice were much more susceptible to oropharyngeal candidiasis than anti-IL-17A antibody-treated mice, yet anti-IL-17A and anti-IL-17RA treatment caused equivalent susceptibilities. Based on microarray analyses of the oral mucosa during infection, only a limited number of genes were associated with oropharyngeal candidiasis susceptibility. In sum, we conclude that IL-17A is the main cytokine mediator of immunity in murine oropharyngeal candidiasis, but a cooperative relationship among IL-17A, IL-17AF, and IL-17F exists in vivo. Susceptibility displays the following hierarchy: IL-17RA- or Act1-deficiency > anti-IL-17A + anti-IL-17F antibodies > anti-IL-17A or anti-IL-17RA antibodies > IL-17A deficiency.
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Affiliation(s)
- Natasha Whibley
- Department of Medicine, Division of Rheumatology & Clinical Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Elaine Tritto
- Novartis Institutes for Biomedical Research, Basel, Switzerland; and
| | | | - Frank Kolbinger
- Novartis Institutes for Biomedical Research, Basel, Switzerland; and
| | - Pierre Moulin
- Novartis Institutes for Biomedical Research, Basel, Switzerland; and
| | - Dominique Brees
- Novartis Institutes for Biomedical Research, Basel, Switzerland; and
| | - Bianca M Coleman
- Department of Medicine, Division of Rheumatology & Clinical Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Anna J Mamo
- Department of Medicine, Division of Rheumatology & Clinical Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Abhishek V Garg
- Department of Medicine, Division of Rheumatology & Clinical Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Jillian R Jaycox
- Department of Medicine, Division of Rheumatology & Clinical Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Ulrich Siebenlist
- National Institute of Allergy and Infectious Disease, Laboratory of Molecular Immunology, National Institutes of Health, Bethesda, Maryland, USA
| | - Michael Kammüller
- Novartis Institutes for Biomedical Research, Basel, Switzerland; and
| | - Sarah L Gaffen
- Department of Medicine, Division of Rheumatology & Clinical Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA;
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Karkowska-Kuleta J, Kozik A. Moonlighting proteins as virulence factors of pathogenic fungi, parasitic protozoa and multicellular parasites. Mol Oral Microbiol 2014; 29:270-83. [PMID: 25131723 DOI: 10.1111/omi.12078] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/31/2014] [Indexed: 01/03/2023]
Abstract
The delicate balance between eukaryotic pathogens and their human hosts during the initiation and development of infection is a complex process involving many diverse interactions. Different infectious agents, including pathogenic fungi, parasitic protozoa and multicellular parasites, directly interact through their cell surface with epithelial or endothelial cells of the human host as well as various proteinaceous host ligands such as extracellular matrix or plasma proteins. Eukaryotic pathogens possess a number of virulence factors but a relatively recently recognized and particularly interesting group of factors capable of enhancing virulence is the set of so-called 'moonlighting proteins'. This term was coined for a relatively large collection of housekeeping enzymes lacking special targeting motifs that would determine their extracellular localization, but that are often present at the cell surface of pathogen. Several such enzymes with key metabolic functions in glycolysis, the pentose phosphate cycle or other fundamental intracellular processes perform entirely new, non-catalytic roles often associated with adhesion to host ligands. Our current study summarizes some of the current knowledge of interesting moonlighting proteins which play putative or confirmed roles as virulence factors in pathogenic fungi, parasitic protozoa and multicellular parasites.
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Affiliation(s)
- J Karkowska-Kuleta
- Department of Analytical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
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Masking of β(1-3)-glucan in the cell wall of Candida albicans from detection by innate immune cells depends on phosphatidylserine. Infect Immun 2014; 82:4405-13. [PMID: 25114110 DOI: 10.1128/iai.01612-14] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The virulence of Candida albicans in a mouse model of invasive candidiasis is dependent on the phospholipids phosphatidylserine (PS) and phosphatidylethanolamine (PE). Disruption of the PS synthase gene CHO1 (i.e., cho1Δ/Δ) eliminates PS and blocks the de novo pathway for PE biosynthesis. In addition, the cho1Δ/Δ mutant's ability to cause invasive disease is severely compromised. The cho1Δ/Δ mutant also exhibits cell wall defects, and in this study, it was determined that loss of PS results in decreased masking of cell wall β(1-3)-glucan from the immune system. In wild-type C. albicans, the outer mannan layer of the wall masks the inner layer of β(1-3)-glucan from exposure and detection by innate immune effector molecules like the C-type signaling lectin Dectin-1, which is found on macrophages, neutrophils, and dendritic cells. The cho1Δ/Δ mutant exhibits increases in exposure of β(1-3)-glucan, which leads to greater binding by Dectin-1 in both yeast and hyphal forms. The unmasking of β(1-3)-glucan also results in increased elicitation of TNF-α from macrophages in a Dectin-1-dependent manner. The role of phospholipids in fungal pathogenesis is an emerging field, and this is the first study showing that loss of PS in C. albicans results in decreased masking of β(1-3)-glucan, which may contribute to our understanding of fungus-host interactions.
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Interplay between Candida albicans and the antimicrobial peptide armory. EUKARYOTIC CELL 2014; 13:950-7. [PMID: 24951441 DOI: 10.1128/ec.00093-14] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Antimicrobial peptides (AMPs) are key elements of innate immunity, which can directly kill multiple bacterial, viral, and fungal pathogens. The medically important fungus Candida albicans colonizes different host niches as part of the normal human microbiota. Proliferation of C. albicans is regulated through a complex balance of host immune defense mechanisms and fungal responses. Expression of AMPs against pathogenic fungi is differentially regulated and initiated by interactions of a variety of fungal pathogen-associated molecular patterns (PAMPs) with pattern recognition receptors (PRRs) on human cells. Inflammatory signaling and other environmental stimuli are also essential to control fungal proliferation and to prevent parasitism. To persist in the host, C. albicans has developed a three-phase AMP evasion strategy, including secretion of peptide effectors, AMP efflux pumps, and regulation of signaling pathways. These mechanisms prevent C. albicans from the antifungal activity of the major AMP classes, including cathelicidins, histatins, and defensins leading to a basal resistance. This minireview summarizes human AMP attack and C. albicans resistance mechanisms and current developments in the use of AMPs as antifungal agents.
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van der Weerden NL, Bleackley MR, Anderson MA. Properties and mechanisms of action of naturally occurring antifungal peptides. Cell Mol Life Sci 2013; 70:3545-70. [PMID: 23381653 PMCID: PMC11114075 DOI: 10.1007/s00018-013-1260-1] [Citation(s) in RCA: 174] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Revised: 12/11/2012] [Accepted: 01/03/2013] [Indexed: 01/06/2023]
Abstract
Antimicrobial peptides are a vital component of the innate immune system of all eukaryotic organisms and many of these peptides have potent antifungal activity. They have potential application in the control of fungal pathogens that are a serious threat to both human health and food security. Development of antifungal peptides as therapeutics requires an understanding of their mechanism of action on fungal cells. To date, most research on antimicrobial peptides has focused on their activity against bacteria. Several antimicrobial peptides specifically target fungal cells and are not active against bacteria. Others with broader specificity often have different mechanisms of action against bacteria and fungi. This review focuses on the mechanism of action of naturally occurring antifungal peptides from a diverse range of sources including plants, mammals, amphibians, insects, crabs, spiders, and fungi. While antimicrobial peptides were originally proposed to act via membrane permeabilization, the mechanism of antifungal activity for these peptides is generally more complex and often involves entry of the peptide into the cell.
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Bcr1 functions downstream of Ssd1 to mediate antimicrobial peptide resistance in Candida albicans. EUKARYOTIC CELL 2013; 12:411-9. [PMID: 23314964 DOI: 10.1128/ec.00285-12] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In order to colonize the host and cause disease, Candida albicans must avoid being killed by host defense peptides. Previously, we determined that the regulatory protein Ssd1 governs antimicrobial peptide resistance in C. albicans. Here, we sought to identify additional genes whose products govern susceptibility to antimicrobial peptides. We discovered that a bcr1Δ/Δ mutant, like the ssd1Δ/Δ mutant, had increased susceptibility to the antimicrobial peptides, protamine, RP-1, and human β defensin-2. Homozygous deletion of BCR1 in the ssd1Δ/Δ mutant did not result in a further increase in antimicrobial peptide susceptibility. Exposure of the bcr1Δ/Δ and ssd1Δ/Δ mutants to RP-1 induced greater loss of mitochondrial membrane potential and increased plasma membrane permeability than with the control strains. Therefore, Bcr1 and Ssd1 govern antimicrobial peptide susceptibility and likely function in the same pathway. Furthermore, BCR1 mRNA expression was downregulated in the ssd1Δ/Δ mutant, and the forced expression of BCR1 in the ssd1Δ/Δ mutant partially restored antimicrobial peptide resistance. These results suggest that Bcr1 functions downstream of Ssd1. Interestingly, overexpression of 11 known Bcr1 target genes in the bcr1Δ/Δ mutant failed to restore antimicrobial peptide resistance, suggesting that other Bcr1 target genes are likely responsible for antimicrobial peptide resistance. Collectively, these results demonstrate that Bcr1 functions downstream of Ssd1 to govern antimicrobial peptide resistance by maintaining mitochondrial energetics and reducing membrane permeabilization.
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Mayer FL, Wilson D, Jacobsen ID, Miramón P, Große K, Hube B. The novel Candida albicans transporter Dur31 Is a multi-stage pathogenicity factor. PLoS Pathog 2012; 8:e1002592. [PMID: 22438810 PMCID: PMC3305457 DOI: 10.1371/journal.ppat.1002592] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Accepted: 01/31/2012] [Indexed: 11/18/2022] Open
Abstract
Candida albicans is the most frequent cause of oral fungal infections. However, the exact pathogenicity mechanisms that this fungus employs are largely unknown and many of the genes expressed during oral infection are uncharacterized. In this study we sought to functionally characterize 12 previously unknown function genes associated with oral candidiasis. We generated homozygous knockout mutants for all 12 genes and analyzed their interaction with human oral epithelium in vitro. Eleven mutants caused significantly less epithelial damage and, of these, deletion of orf19.6656 (DUR31) elicited the strongest reduction in pathogenicity. Interestingly, DUR31 was not only involved in oral epithelial damage, but in multiple stages of candidiasis, including surviving attack by human neutrophils, endothelial damage and virulence in vivo. In silico analysis indicated that DUR31 encodes a sodium/substrate symporter with 13 transmembrane domains and no human homologue. We provide evidence that Dur31 transports histatin 5. This is one of the very first examples of microbial driven import of this highly cytotoxic antimicrobial peptide. Also, in contrast to wild type C. albicans, dur31Δ/Δ was unable to actively increase local environmental pH, suggesting that Dur31 lies in the extracellular alkalinization hyphal auto-induction pathway; and, indeed, DUR31 was required for morphogenesis. In agreement with this observation, dur31Δ/Δ was unable to assimilate the polyamine spermidine.
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Affiliation(s)
- François L. Mayer
- Department of Microbial Pathogenicity Mechanisms, Hans-Knoell-Institute, Jena, Germany
| | - Duncan Wilson
- Department of Microbial Pathogenicity Mechanisms, Hans-Knoell-Institute, Jena, Germany
| | - Ilse D. Jacobsen
- Department of Microbial Pathogenicity Mechanisms, Hans-Knoell-Institute, Jena, Germany
| | - Pedro Miramón
- Department of Microbial Pathogenicity Mechanisms, Hans-Knoell-Institute, Jena, Germany
| | - Katharina Große
- Department of Microbial Pathogenicity Mechanisms, Hans-Knoell-Institute, Jena, Germany
| | - Bernhard Hube
- Department of Microbial Pathogenicity Mechanisms, Hans-Knoell-Institute, Jena, Germany
- Friedrich Schiller University, Jena, Germany
- * E-mail:
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Surfome analysis of a wild-type wine Saccharomyces cerevisiae strain. Food Microbiol 2011; 28:1220-30. [DOI: 10.1016/j.fm.2011.04.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2010] [Revised: 04/18/2011] [Accepted: 04/27/2011] [Indexed: 11/20/2022]
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Lam OLT, Bandara HMHN, Samaranayake LP, McGrath C, Li LSW. Oral health promotion interventions on oral yeast in hospitalised and medically compromised patients: a systematic review. Mycoses 2011; 55:123-42. [PMID: 21749481 DOI: 10.1111/j.1439-0507.2011.02062.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Yeast are major aetiological agents of localised oral mucosal lesions, and are also leading causes of nosocomial bloodstream infections. The purpose of this systematic review was to examine the effectiveness of oral health promotion interventions on the prevalence and incidence of these opportunistic oral pathogens in hospitalised and medically compromised patients. The PubMed, ISI Web of Science and Cochrane Library databases were searched for clinical trials assessing the effect of oral health promotion interventions on oral yeast. Chlorhexidine delivered in a variety of oral hygiene products appeared to have some effect on oral yeast, although some studies found equivocal effects. Although a wide array of other compounds have also been investigated, their clinical effectiveness remains to be substantiated. Likewise, the utility of mechanical oral hygiene interventions and other oral health promotion measures such as topical application of salivary substitute, remains unsettled. Although many chemical agents contained in oral hygiene products have proven in vitro activity against oral yeast, their clinical effectiveness and potential role as adjuncts or alternative therapies to conventional treatment remains to be confirmed by further high-quality randomised controlled trials. This is pertinent, given the recent emergence of yeast resistance to conventional antifungal agents.
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Affiliation(s)
- Otto L T Lam
- Oral Rehabilitation, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
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Abstract
Oropharyngeal candidiasis (OPC, thrush) is an opportunistic infection caused by the commensal fungus Candida albicans. An understanding of immunity to Candida has recently begun to unfold with the identification of fungal pattern-recognition receptors such as C-type lectin receptors, which trigger protective T-helper (Th)17 responses in the mucosa. Hyper-IgE syndrome (HIES/Job's syndrome) is a rare congenital immunodeficiency characterized by dominant-negative mutations in signal transducer and activator of transcription 3, which is downstream of the Th17-inductive cytokines interleukin (IL)-6 and IL-23, and hence patients with HIES exhibit dramatic Th17 deficits. HIES patients develop oral and mucocutaneous candidiasis, supporting a protective role for Th17 cells in immunity to OPC. However, the Th17-dependent mechanisms of antifungal immunity in OPC are still poorly defined. An often unappreciated aspect of oral immunity is saliva, which is rich in antimicrobial proteins (AMPs) and exerts direct antifungal activity. In this study, we show that HIES patients show significant impairment in salivary AMPs, including β-defensin 2 and Histatins. This tightly correlates with reduced candidacidal activity of saliva and concomitantly elevated colonization with Candida. Moreover, IL-17 induces histatins in cultured salivary gland cells. This is the first demonstration that HIES is associated with defective salivary activity, and provides a mechanism for the severe susceptibility of these patients to OPC.
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HNP-3 enhanced the antimicrobial activity of CIP by promoting ATP efflux from P. aeruginosa cells. Mol Biol Rep 2010; 38:2673-8. [PMID: 21107732 DOI: 10.1007/s11033-010-0409-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2010] [Accepted: 11/08/2010] [Indexed: 02/05/2023]
Abstract
To establish a novel strategy of P. aeruginosa control, we acquired recombination HNP-3 by gene recombination. Then we examined HNP-3 bio-activities and the influences of antimicrobial peptide on the efflux of ATP. Consequently, we obtained target protein with a molecular mass of 3,000 D consistent with the Anticipation. FIC index of Ciprofloxacin added HNP-3 was less than 0.5 and HNP3 synergistically cooperated with CIP to suppress P. aeruginosa colony formation revealed that there was significant synergy. ATP efflux was however up-regulated by low concentrations of HNP-3, although CIP did not exert any influence on ATP efflux. Conclusively, recombination protein HNP-3 displayed antimicrobial and synergic effects. HNP-3 enhanced the antimicrobial activity of CIP by promoting ATP efflux from P. aeruginosa cells and decreasing efflux of the drugs, which could have useful clinical applications.
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Isola M, Solinas P, Proto E, Cossu M, Lantini MS. Reduced statherin reactivity of human submandibular gland in diabetes. Oral Dis 2010; 17:217-20. [DOI: 10.1111/j.1601-0825.2010.01725.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pereira HA, Tsyshevskaya-Hoover I, Hinsley H, Logan S, Nguyen M, Nguyen TT, Pohl J, Wozniak K, Fidel PL. Candidacidal activity of synthetic peptides based on the antimicrobial domain of the neutrophil-derived protein, CAP37. Med Mycol 2010. [DOI: 10.3109/13693780903081976] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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Conti HR, Shen F, Nayyar N, Stocum E, Sun JN, Lindemann MJ, Ho AW, Hai JH, Yu JJ, Jung JW, Filler SG, Masso-Welch P, Edgerton M, Gaffen SL. Th17 cells and IL-17 receptor signaling are essential for mucosal host defense against oral candidiasis. J Exp Med 2009; 206:299-311. [PMID: 19204111 PMCID: PMC2646568 DOI: 10.1084/jem.20081463] [Citation(s) in RCA: 771] [Impact Index Per Article: 51.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2008] [Accepted: 01/07/2009] [Indexed: 12/14/2022] Open
Abstract
The commensal fungus Candida albicans causes oropharyngeal candidiasis (OPC; thrush) in settings of immunodeficiency. Although disseminated, vaginal, and oral candidiasis are all caused by C. albicans species, host defense against C. albicans varies by anatomical location. T helper 1 (Th1) cells have long been implicated in defense against candidiasis, whereas the role of Th17 cells remains controversial. IL-17 mediates inflammatory pathology in a gastric model of mucosal candidiasis, but is host protective in disseminated disease. Here, we directly compared Th1 and Th17 function in a model of OPC. Th17-deficient (IL-23p19(-/-)) and IL-17R-deficient (IL-17RA(-/-)) mice experienced severe OPC, whereas Th1-deficient (IL-12p35(-/-)) mice showed low fungal burdens and no overt disease. Neutrophil recruitment was impaired in IL-23p19(-/-) and IL-17RA(-/-), but not IL-12(-/-), mice, and TCR-alphabeta cells were more important than TCR-gammadelta cells. Surprisingly, mice deficient in the Th17 cytokine IL-22 were only mildly susceptible to OPC, indicating that IL-17 rather than IL-22 is vital in defense against oral candidiasis. Gene profiling of oral mucosal tissue showed strong induction of Th17 signature genes, including CXC chemokines and beta defensin-3. Saliva from Th17-deficient, but not Th1-deficient, mice exhibited reduced candidacidal activity. Thus, the Th17 lineage, acting largely through IL-17, confers the dominant response to oral candidiasis through neutrophils and antimicrobial factors.
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Affiliation(s)
- Heather R. Conti
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Fang Shen
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Namrata Nayyar
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Eileen Stocum
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Jianing N. Sun
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Matthew J. Lindemann
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Allen W. Ho
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Justine Hoda Hai
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Jeffrey J. Yu
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Ji Won Jung
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Scott G. Filler
- David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095
| | - Patricia Masso-Welch
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Mira Edgerton
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
| | - Sarah L. Gaffen
- Department of Oral Biology, School of Dental Medicine; Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences; Department of Biotechnology, University at Buffalo, State University of New York, Buffalo, NY 14201
- University of Pittsburgh Department of Medicine, Division of Rheumatology and Clinical Immunology, Pittsburgh, PA 15261
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Abstract
The Candida albicans cell wall maintains the structural integrity of the organism in addition to providing a physical contact interface with the environment. The major components of the cell wall are fibrillar polysaccharides and proteins. The proteins of the cell wall are the focus of this review. Three classes of proteins are present in the candidal cell wall. One group of proteins attach to the cell wall via a glycophosphatidylinositol remnant or by an alkali-labile linkage. A second group of proteins with N-terminal signal sequences but no covalent attachment sequences are secreted by the classical secretory pathway. These proteins may end up in the cell wall or in the extracellular space. The third group of proteins lack a secretory signal, and the pathway(s) by which they become associated with the surface is unknown. Potential constituents of the first two classes have been predicted from analysis of genome sequences. Experimental analyses have identified members of all three classes. Some members of each class selected for consideration of confirmed or proposed function, phenotypic analysis of a mutant, and regulation by growth conditions and transcription factors are discussed in more detail.
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