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Kumar R, Ali SA, Singh SK, Bhushan V, Mathur M, Jamwal S, Mohanty AK, Kaushik JK, Kumar S. Antimicrobial Peptides in Farm Animals: An Updated Review on Its Diversity, Function, Modes of Action and Therapeutic Prospects. Vet Sci 2020; 7:vetsci7040206. [PMID: 33352919 PMCID: PMC7766339 DOI: 10.3390/vetsci7040206] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 11/15/2020] [Accepted: 11/16/2020] [Indexed: 12/13/2022] Open
Abstract
Antimicrobial peptides (AMPs) are the arsenals of the innate host defense system, exhibiting evolutionarily conserved characteristics that are present in practically all forms of life. Recent years have witnessed the emergence of antibiotic-resistant bacteria compounded with a slow discovery rate for new antibiotics that have necessitated scientific efforts to search for alternatives to antibiotics. Research on the identification of AMPs has generated very encouraging evidence that they curb infectious pathologies and are also useful as novel biologics to function as immunotherapeutic agents. Being innate, they exhibit the least cytotoxicity to the host and exerts a wide spectrum of biological activity including low resistance among microbes and increased wound healing actions. Notably, in veterinary science, the constant practice of massive doses of antibiotics with inappropriate withdrawal programs led to a high risk of livestock-associated antimicrobial resistance. Therefore, the world faces tremendous pressure for designing and devising strategies to mitigate the use of antibiotics in animals and keep it safe for posterity. In this review, we illustrate the diversity of farm animal-specific AMPs, and their biochemical foundations, mode of action, and prospective application in clinics. Subsequently, we present the data for their systematic classification under the major and minor groups, antipathogenic action, and allied bioactivities in the host. Finally, we address the limitations of their clinical implementation and envision areas for further advancement.
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Franco C, Patricia HR, Timo S, Claudia B, Marcela H. Matrix Metalloproteinases as Regulators of Periodontal Inflammation. Int J Mol Sci 2017; 18:ijms18020440. [PMID: 28218665 PMCID: PMC5343974 DOI: 10.3390/ijms18020440] [Citation(s) in RCA: 169] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 02/07/2017] [Accepted: 02/08/2017] [Indexed: 12/26/2022] Open
Abstract
Periodontitis are infectious diseases characterized by immune-mediated destruction of periodontal supporting tissues and tooth loss. Matrix metalloproteinases (MMPs) are key proteases involved in destructive periodontal diseases. The study and interest in MMP has been fuelled by emerging evidence demonstrating the broad spectrum of molecules that can be cleaved by them and the myriad of biological processes that they can potentially regulate. The huge complexity of MMP functions within the 'protease web' is crucial for many physiologic and pathologic processes, including immunity, inflammation, bone resorption, and wound healing. Evidence points out that MMPs assemble in activation cascades and besides their classical extracellular matrix substrates, they cleave several signalling molecules-such as cytokines, chemokines, and growth factors, among others-regulating their biological functions and/or bioavailability during periodontal diseases. In this review, we provide an overview of emerging evidence of MMPs as regulators of periodontal inflammation.
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Affiliation(s)
- Cavalla Franco
- Department of Conservative Dentistry, School of Dentistry, Universidad de Chile, Santiago 8380492, Chile.
- Department of Biological Sciences, School of Dentistry of Bauru, University of São Paulo (FOB/USP), Bauru, São Paulo 17012-901, Brazil.
- Center for Craniofacial Research, University of Texas School of Dentistry at Houston, Houston, TX 77054, USA.
| | - Hernández-Ríos Patricia
- Department of Conservative Dentistry, School of Dentistry, Universidad de Chile, Santiago 8380492, Chile.
| | - Sorsa Timo
- Department of Oral and Maxillofacial Diseases, Helsinki University and Helsinki University Central Hospital, Helsinki 00290, Finland.
- Division of Periodontology, Department of Dental Medicine, Karolinska Institutet, Huddinge 14183, Sweden.
| | - Biguetti Claudia
- Department of Biological Sciences, School of Dentistry of Bauru, University of São Paulo (FOB/USP), Bauru, São Paulo 17012-901, Brazil.
- Center for Craniofacial Research, University of Texas School of Dentistry at Houston, Houston, TX 77054, USA.
| | - Hernández Marcela
- Laboratory of Periodontal Biology, Faculty of Dentistry, Universidad de Chile, Santiago 8380492, Chile.
- Dentistry Unit, Faculty of Health Sciences, Universidad Autónoma de Chile, Santiago 8910060, Chile.
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Shang D, Liang H, Wei S, Yan X, Yang Q, Sun Y. Effects of antimicrobial peptide L-K6, a temporin-1CEb analog on oral pathogen growth, Streptococcus mutans biofilm formation, and anti-inflammatory activity. Appl Microbiol Biotechnol 2014; 98:8685-95. [PMID: 25056289 DOI: 10.1007/s00253-014-5927-9] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2014] [Revised: 06/16/2014] [Accepted: 07/01/2014] [Indexed: 10/25/2022]
Abstract
Dental caries and periodontitis are common bacterial mouth infections. As a potentially attractive substitute for conventional antibiotics, antimicrobial peptides have been widely tested and used for controlling bacterial infections. In this study, we tested the efficacy of the peptides from the skin secretions of Rana chensinensis for killing several major cariogenic and periodontic pathogens as well as Candida albicans. L-K6, a temporin-1CEb analog, exhibited high antimicrobial activity against the tested oral pathogens and was able to inhibit Streptococcus mutans biofilm formation and reduce 1-day-old S. mutans biofilms with a minimum biofilm inhibitory concentration and reducing concentration of 3.13 and 6.25 μM, respectively. The results of confocal laser scanning microscopy demonstrated that the peptide significantly reduced cell viability within oral biofilms. Furthermore, as little as 5 μM L-K6 significantly inhibited lipopolysaccharide (LPS)- and interleukin-1β-induced productions of interleukin-8 and tumor necrosis factor-α from THP-1 monocytic cells. This anti-inflammatory activity is associated with the binding of L-K6 to LPS and neutralizing LPS-induced proinflammatory responses in THP-1 cells, as well as dissociating LPS aggregates. Our results suggest that L-K6 may have potential clinical applications in treating dental caries by killing S. mutans within dental plaque and acting as anti-inflammatory agents in infected tissues.
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Affiliation(s)
- Dejing Shang
- Liaoning Provincial Key Laboratory of Biotechnology and Drug Discovery, Liaoning Normal University, Dalian, 116081, People's Republic of China,
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Cathelicidins: family of antimicrobial peptides. A review. Mol Biol Rep 2012; 39:10957-70. [PMID: 23065264 PMCID: PMC3487008 DOI: 10.1007/s11033-012-1997-x] [Citation(s) in RCA: 340] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2012] [Accepted: 10/01/2012] [Indexed: 11/29/2022]
Abstract
Cathelicidins are small, cationic, antimicrobial peptides found in humans and other species, including farm animals (cattle, horses, pigs, sheep, goats, chickens, rabbits and in some species of fish). These proteolytically activated peptides are part of the innate immune system of many vertebrates. These peptides show a broad spectrum of antimicrobial activity against bacteria, enveloped viruses and fungi. Apart from exerting direct antimicrobial effects, cathelicidins can also trigger specific defense responses in the host. Their roles in various pathophysiological conditions have been studied in mice and humans, but there are limited information about their expression sites and activities in livestock. The aim of the present review is to summarize current information about these antimicrobial peptides in farm animals, highlighting peptide expression sites, activities, and future applications for human and veterinary medicine.
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Sang Y, Blecha F. Porcine host defense peptides: expanding repertoire and functions. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2009; 33:334-343. [PMID: 18579204 DOI: 10.1016/j.dci.2008.05.006] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2008] [Revised: 05/13/2008] [Accepted: 05/13/2008] [Indexed: 05/26/2023]
Abstract
Host defense peptides (HDPs) are a large group of innate immune effectors that are also termed antimicrobial peptides. Because of the rapid progress that has been made in completing several animal genomes, many HDPs have been systemically defined using bioinformatic analysis and partially characterized using reverse genomic approaches. In pigs, about 30 HDPs have been identified and partially characterized relative to structure and function. Antimicrobial activity of porcine HDPs has been extensively evaluated against a broad spectrum of microorganisms in vitro and evaluated for their protective role in vivo. Increasing evidence indicates that HDPs are functionally differentiated during posttranslational and postsecretory processing, and that the structural units for antimicrobial and immunoregulatory functions are separate. These findings suggest promising new avenues for therapeutic drug design based on HDPs, including porcine HDPs. This review summarizes and discusses advances in porcine HDPs research during the last decade with an emphasis on the rapidly expanding profiles and biological functions.
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Affiliation(s)
- Yongming Sang
- Department of Anatomy and Physiology, Kansas State University, Manhattan, KS 66506, USA
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VELVART PETER, PETERS CHRISTINEI, PETERS OVEA. Soft tissue management: flap design, incision, tissue elevation, and tissue retraction. ACTA ACUST UNITED AC 2005. [DOI: 10.1111/j.1601-1546.2005.00157.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Concannon SP, Crowe TD, Abercrombie JJ, Molina CM, Hou P, Sukumaran DK, Raj PA, Leung KP. Susceptibility of oral bacteria to an antimicrobial decapeptide. J Med Microbiol 2003; 52:1083-1093. [PMID: 14614067 DOI: 10.1099/jmm.0.05286-0] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Naturally occurring antimicrobial peptides have emerged as alternative classes of antimicrobials. In general, these antimicrobial peptides exhibit selectivity for prokaryotes and minimize the problems of engendering microbial resistance. As an alternative method to search for more effective broad-spectrum peptide antimicrobials, investigators have developed peptide libraries by using synthetic combinatorial technology. A novel decapeptide, KKVVFKVKFK (KSL), has been identified that shows a broad range of antibacterial activity. The purpose of this study was to test the efficacy of this antimicrobial peptide in killing selected strains of oral pathogens and resident saliva bacteria collected from human subjects. Cytotoxic activity of KSL against mammalian cells and the structural features of this decapeptide were also investigated, the latter by using two-dimensional NMR in aqueous and DMSO solutions. MICs of KSL for the majority of oral bacteria tested in vitro ranged from 3 to 100 microg ml(-1). Minimal bactericidal concentrations of KSL were, in general, within one to two dilutions of the MICs. KSL exhibited an ED(99) (the dose at which 99 % killing was observed after 15 min at 37 degrees C) of 6.25 microg ml(-1) against selected strains of Lactobacillus salivarius, Streptococcus mutans, Streptococcus gordonii and Actinobacillus actinomycetemcomitans. In addition, KSL damaged bacterial cell membranes and caused 1.05 log units reduction of viability counts of saliva bacteria. In vitro toxicity studies showed that KSL, at concentrations up to 1 mg ml(-1), did not induce cell death or compromise the membrane integrity of human gingival fibroblasts. NMR studies suggest that KSL adopts an alpha-helical structure in DMSO solution, which mimics the polar aprotic membrane environment, whereas it remains unstructured in aqueous medium. This study shows that KSL may be a useful antimicrobial agent for inhibiting the growth of oral bacteria that are associated with caries development and early plaque formation.
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Affiliation(s)
- S P Concannon
- Microbiology Branch, US Army Dental Research Detachment, Walter Reed Army Institute of Research, Great Lakes, IL 60088, USA 2Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA 3School of Dentistry, Marquette University, Milwaukee, WI 53233, USA
| | - T D Crowe
- Microbiology Branch, US Army Dental Research Detachment, Walter Reed Army Institute of Research, Great Lakes, IL 60088, USA 2Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA 3School of Dentistry, Marquette University, Milwaukee, WI 53233, USA
| | - J J Abercrombie
- Microbiology Branch, US Army Dental Research Detachment, Walter Reed Army Institute of Research, Great Lakes, IL 60088, USA 2Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA 3School of Dentistry, Marquette University, Milwaukee, WI 53233, USA
| | - C M Molina
- Microbiology Branch, US Army Dental Research Detachment, Walter Reed Army Institute of Research, Great Lakes, IL 60088, USA 2Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA 3School of Dentistry, Marquette University, Milwaukee, WI 53233, USA
| | - P Hou
- Microbiology Branch, US Army Dental Research Detachment, Walter Reed Army Institute of Research, Great Lakes, IL 60088, USA 2Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA 3School of Dentistry, Marquette University, Milwaukee, WI 53233, USA
| | - D K Sukumaran
- Microbiology Branch, US Army Dental Research Detachment, Walter Reed Army Institute of Research, Great Lakes, IL 60088, USA 2Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA 3School of Dentistry, Marquette University, Milwaukee, WI 53233, USA
| | - P A Raj
- Microbiology Branch, US Army Dental Research Detachment, Walter Reed Army Institute of Research, Great Lakes, IL 60088, USA 2Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA 3School of Dentistry, Marquette University, Milwaukee, WI 53233, USA
| | - K-P Leung
- Microbiology Branch, US Army Dental Research Detachment, Walter Reed Army Institute of Research, Great Lakes, IL 60088, USA 2Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA 3School of Dentistry, Marquette University, Milwaukee, WI 53233, USA
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Abstract
Iseganan HCl is an antimicrobial peptide under development for the prevention of oral mucositis, a severe consequence of some chemotherapy and radiation therapy regimens. Several attributes of iseganan make it an optimal candidate for study in this clinical situation where both local and systemic host defenses may be impaired. These include broad spectrum and rapid bactericidal activity, a lack of observed resistance and cross-resistance and stability in biological fluids. Clinical trials of patients receiving stomatotoxic chemotherapy followed by a haematopoietic stem cell transplant show iseganan reduces the occurrence of oral mucositis and ameliorates sequelae such as mouth pain, throat pain and difficulty swallowing. Iseganan is well-tolerated, which is partly attributable to a lack of systemic absorption following topical oral administration. Other promising areas of investigation include topical oral application for the prevention of ventilator-associated pneumonia and nebulisation for treatment of chronic lung infection in patients with cystic fibrosis. Future studies will expand on the role of iseganan as a novel antimicrobial.
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Affiliation(s)
- Francis J Giles
- The University of Texas, MD Anderson Cancer Center, Department of Leukaemia, 1515 Holcombe Boulevard, Box 428, Houston, TX 77030, USA.
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Dunsche A, Açil Y, Dommisch H, Siebert R, Schröder JM, Jepsen S. The novel human beta-defensin-3 is widely expressed in oral tissues. Eur J Oral Sci 2002; 110:121-4. [PMID: 12013554 DOI: 10.1034/j.1600-0722.2002.11186.x] [Citation(s) in RCA: 133] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The purpose of this study was to investigate the expression of human beta-defensins (hBD), especially of the recently discovered hBD-3, in oral tissues by reverse-transcription polymerase chain reaction (RT-PCR). Primary oral keratinocytes (n = 3) and fibroblasts (n = 3), 64 non-inflamed and 40 inflamed oral tissue samples, and 10 samples of salivary glands, were examined. The transcripts for hBD-3 (61/64), as well as for hBD-1 (64/64) and hBD-2 (54/64), were found to be widely expressed in non-inflamed oral tissues. In contrast, only 23, 22 and 24 of the 40 inflamed tissues showed detectable hBD-1, -2 and -3 transcripts, respectively. In salivary glands, mRNA expression was constitutive for hBD-1, frequent for hBD-2 (9/10), and infrequent for hBD-3 (4/10). Oral keratinocytes, but not fibroblasts, contained transcripts for all beta-defensins, suggesting that the novel hBD-3 is also produced in the epithelial compartment of oral tissues. The results indicate an important role for the novel hBD-3, as well as for hBD-1 and hBD-2, in the innate oral epithelial host defense.
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Affiliation(s)
- Anton Dunsche
- Department of Oral and Maxillofacial Surgery, University Hospital Kiel, Germany.
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10
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O'Keefe BR. Biologically active proteins from natural product extracts. JOURNAL OF NATURAL PRODUCTS 2001; 64:1373-1381. [PMID: 11678673 DOI: 10.1021/np0103362] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The term "biologically active proteins" is almost redundant. All proteins produced by living creatures are, by their very nature, biologically active to some extent in their homologous species. In this review, a subset of these proteins will be discussed that are biologically active in heterologous systems. The isolation and characterization of novel proteins from natural product extracts including those derived from microorganisms, plants, insects, terrestrial vertebrates, and marine organisms will be reviewed and grouped into several distinct classes based on their biological activity and their structure.
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Affiliation(s)
- B R O'Keefe
- Molecular Targets Drug Discovery Program, Center for Cancer Research, National Cancer Institute-Frederick, Frederick, MD 21702-1201, USA.
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11
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Abstract
Cathelicidins are a numerous group of mammalian proteins that carry diverse antimicrobial peptides at the C-terminus of a highly conserved preproregion. These peptides, which become active when released from the proregion, display a remarkable variety of sizes, sequences, and structures, and in fact comprise representatives of all the structural groups in which the known antimicrobial peptides have been classified. Most of the cathelicidin-derived peptides exert a broad spectrum and potent antimicrobial activity and also bind to lipopolysaccharide and neutralize its effects. In addition, some of them have recently been shown to exert other activities and might participate in host defense also by virtue of their ability to induce expression of molecules involved in a variety of biological processes. This review is aimed at providing a general overview of the cathelicidins and of the peptides derived therefrom, with emphasis on aspects such as structure, biological activities in vitro and in vivo, and structure/activity relationship studies.
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Affiliation(s)
- R Gennaro
- Dipartimento di Biochimica, Biofisica e Chimica delle Macromolecole, Università di Trieste, Via Giorgieri, 1, 34127 Trieste, Italy.
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12
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Tanaka D, Miyasaki KT, Lehrer RI. Sensitivity of Actinobacillus actinomycetemcomitans and Capnocytophaga spp. to the bactericidal action of LL-37: a cathelicidin found in human leukocytes and epithelium. ORAL MICROBIOLOGY AND IMMUNOLOGY 2000; 15:226-31. [PMID: 11154407 DOI: 10.1034/j.1399-302x.2000.150403.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The bactericidal activity of synthetic LL-37, a cathelicidin, was assessed against Actinobacillus actinomycetemcomitans (three strains) and Capnocytophaga spp. (three strains). All strains were sensitive to LL-37, and exhibited 99% effective dose of 7.5-to-11.6 micrograms/ml. An amidated form of LL-37, pentamide-37, killed with about the same efficacy as LL-37. Partial inhibition of killing was noted at physiologic concentrations of NaCl, and complete inhibition was observed at 400 mM NaCl. At approximately the 99% effective dose--i.e., 10 micrograms/ml--LL-37 also lost activity against A. actinomycetemcomitans in the presence of native or heat-inactivated 10-15% normal human AB serum. Pentamide-37 was less sensitive to serum inhibition than LL-37. In conclusion, certain oral, gram-negative bacteria are sensitive to the bactericidal activity of LL-37 at low concentrations of serum and salt, a condition likely to be found within the membrane-delimited phagolysosome. Modified forms of LL-37, such as pentamide-37, may be more suitable for future therapeutic application in the presence of serum.
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Affiliation(s)
- D Tanaka
- Division of Oral Biology and Medicine, Dental Research Institute, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095-1668, USA
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13
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Abstract
Antibiotic peptides are a key component of the innate immune systems of most multicellular organisms. Despite broad divergences in sequence and taxonomy, most antibiotic peptides share a common mechanism of action, i.e., membrane permeabilization of the pathogen. This review provides a general introduction to the subject, with emphasis on aspects such as structural types, post-translational modifications, mode of action or mechanisms of resistance. Some of these questions are treated in depth in other reviews in this issue. The review also discusses the role of antimicrobial peptides in nature, including several pathological conditions, as well as recent accounts of their application at the preclinical level.
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Affiliation(s)
- D Andreu
- Department of Organic Chemistry, Universitat de Barcelona, Spain.
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Kinane DF, Mooney J, Ebersole JL. Humoral immune response to Actinobacillus actinomycetemcomitans and Porphyromonas gingivalis in periodontal disease. Periodontol 2000 1999; 20:289-340. [PMID: 10522229 DOI: 10.1111/j.1600-0757.1999.tb00164.x] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- D F Kinane
- Department of Periodontology and Oral Immunology, Glasgow Dental Hospital and School, Scotland, United Kingdom
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McKay MS, Olson E, Hesla MA, Panyutich A, Ganz T, Perkins S, Rossomando EF. Immunomagnetic recovery of human neutrophil defensins from the human gingival crevice. ORAL MICROBIOLOGY AND IMMUNOLOGY 1999; 14:190-3. [PMID: 10495714 DOI: 10.1034/j.1399-302x.1999.140308.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The human neutrophilic protein defensins are cationic, antimicrobial, cytotoxic, corticostatic chemotactic, opsonic peptides found in azurophilic granules and constitute about 5% of the total protein in human neutrophils. In the present study, defensins were recovered from the human gingival crevice using paramagnetic microspheres (beads), coated with anti-defensin antibodies. The bead-bound defensins were assayed using an enzyme-linked immunosorbent assay developed in this laboratory. Twenty sites were sampled; defensin was found in 100% of the sites and ranged in amount from 270-2000 ng/site. The large local concentrations of defensins, estimated in the mg/ml range, may have major effects on the microbiology of the gingival crevice.
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Affiliation(s)
- M S McKay
- Department of BioStructure and Function, University of Connecticut School of Dental Medicine, Farmington 06030, USA
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Weinberg A, Krisanaprakornkit S, Dale BA. Epithelial antimicrobial peptides: review and significance for oral applications. CRITICAL REVIEWS IN ORAL BIOLOGY AND MEDICINE : AN OFFICIAL PUBLICATION OF THE AMERICAN ASSOCIATION OF ORAL BIOLOGISTS 1998; 9:399-414. [PMID: 9825219 DOI: 10.1177/10454411980090040201] [Citation(s) in RCA: 177] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Epithelial tissues provide the first line of defense between an organism and the environment. Disruption of this barrier leads to bacterial invasion and subsequent inflammation. This is precisely the situation existing in the human oral cavity, where tissues are constantly exposed to a variety of microbial challenges that can lead to bacterially induced periodontal diseases, and to infections of the oral mucosa by bacteria, fungi, and viruses. With the recent discoveries of host-derived peptide antibiotics in mammalian mucosal epithelium, a new line of investigation is emerging to test the hypothesis that one class of these peptides, called "beta-defensins", functions to protect the host against microbial pathogenesis at these critical, confrontational sites. In that light, impairment of beta-defensin activity has recently been implicated in chronic bacterial infections in cystic fibrosis patients. The first direct evidence of expression of defensin peptides in the oral mucosa was the identification of a novel epithelial beta-defensin in mammalian tongue. It was shown to be upregulated in inflammation, suggesting that it participates in host defense. It is theorized that epithelial cell-derived antimicrobial peptides function to keep the natural flora of micro-organisms in a steady state in different niches such as the skin, the intestines, the airway, the endocervix, and the mouth. There is now evidence indicating that normal gingival epithelial cells and tissues express two beta-defensins, hBD-1 and the newly described hBD-2. In addition, a cathelin-class antimicrobial peptide, designated LL-37 and found in human neutrophils, is also expressed in skin and gingiva. It is highly likely that these and/or other epithelial antimicrobial peptides play an important role in determining the outcome of the host-pathogen interaction at the oral mucosal barrier, and that they may have important future applications in antibiotic treatment.
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Affiliation(s)
- A Weinberg
- Department of Periodontics, Case Western Reserve University, Cleveland, Ohio 44106-4905, USA
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18
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Abstract
Antibacterial peptides were first considered rather species-specific. However, the perspective began to change in 1987-89. Five years later there were two symposium volumes and several reviews on gene-encoded peptide antibiotics which covered the known peptides irrespective of origin. The field is rapidly growing and a first update was published in this Journal in 1996. At that time a database was made with about 100 entries; now it has over 400, with some redundancy. Recently a methodological handbook was published and there are many specialized reviews covering only defensins or insect immunity. In the last 2 years, the larger perspective of innate immunity and the role of gene-mediated peptide antibiotics have evolved in ways which justify a new update. Today insects and plants are known to have similar overall design of their defensins while insects and mammals have very similar control mechanisms. The signal pathways are beginning to appear and the future perspective may involve additional changes.
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Affiliation(s)
- H G Boman
- Karolinska Institutet, Stockholm, Sweden
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19
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Abstract
Small, cysteine-rich, beta-sheet peptide antibiotics are found throughout the Animalia. Though broad spectrum in potential, they may exert selective antimicrobial effects under certain conditions. We have explored the antimicrobial properties of two families of beta-sheet peptide antibiotics, defensins and protegrins, against periodontopathic bacteria. The rabbit defensin NP-1 was active against facultative Gram-negative bacteria associated with early onset periodontitis, including Actinobacillus actinomycetemcomitans and the Capnocytophaga spp. Porcine protegrins showed even greater activity against those organisms, as well as against anaerobic bacteria associated with adult periodontitis, including Porphyromonas gingivalis Prevotella intermedia and Fusobacterium nucleatum. Based on these observations, we believe that protegrin-like beta-sheet peptide antibiotics may be useful dental therapeutics.
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Affiliation(s)
- K T Miyasaki
- UCLA School of Dentistry, Section of Oral Biology 90095-1668, USA.
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20
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Abstract
The past year brought several discoveries that focused attention on antimicrobial peptides on epithelial surfaces. The malfunction of these substances was implicated as a cause of airway infections in cystic fibrosis. Other highlights included new insights into the relative selectivity of antimicrobial peptides for microbial membranes, their primary site of action.
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Affiliation(s)
- T Ganz
- Department of Medicine, University of California School of Medicine, Los Angeles 90095-1690, USA.
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Miyasaki KT, Iofel R, Oren A, Huynh T, Lehrer RI. Killing of Fusobacterium nucleatum, Porphyromonas gingivalis and Prevotella intermedia by protegrins. J Periodontal Res 1998; 33:91-8. [PMID: 9553868 DOI: 10.1111/j.1600-0765.1998.tb02297.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Protegrins are broad spectrum antibiotic peptides isolated from porcine leukocytes. In this study, we (i) examine the sensitivity of Gram-negative, anaerobic periodontal pathogens to synthetic protegrins; (ii) determine the relative potencies of protegrin congeners against these bacteria; and (iii) compare the potency of protegrins with other antibiotic peptides, including magainin MSI-78, tachyplesin I, cecropin P1, human defensins HNP-1-3, and clavanin A. Synthetic L- and D-enantiomers of protegrin 1 (PG-1 and D-PG-1, respectively), and L-enantiomers of protegrins 2, 3 and 5 (PG-2, PG-3 and PG-5) were tested against Fusobacterium nucleatum, and black-pigmented organisms including Porphyromonas gingivalis and Prevotella intermedia. Strains of both F. nucleatum and the black-pigmented organisms were sensitive to PG-1, and exhibited mean ED99 of 2.2-2.3 micrograms/ml and 3.4-9.9 micrograms/ml, respectively. The D-form was statistically more potent than the L-form against these oral anaerobes, and although this difference in potency is unlikely to be of decisive therapeutic significance, the D-form may be of value given ability to resist microbial and host-derived proteases. PG-1 was more potent than magainin, tachyplesin, cecropin, defensins and clavanin under test conditions. Hypertonic salt concentrations and heat-inactivated serum were found to be inhibitory to the bactericidal activity of PG-1. PG-1 was found to induce morphologic alterations in the ultrastructural appearance of F. nucleatum consistent with damage to the bacterial membranes. We conclude that protegrins may be useful antimicrobial agents in therapy against Gram-negative anaerobic bacteria believed to be involved in chronic, adult forms of periodontal infections.
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Affiliation(s)
- K T Miyasaki
- Section of Oral Biology, UCLA School of Dentistry 90095-1668, USA.
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