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https://www.readbyqxmd.com/read/28938518/antimicrobial-peptides-amps-the-quintessential-offense-and-defense-molecules-are-more-than-antimicrobials
#1
REVIEW
Seema Patel, Nadeem Akhtar
Antimicrobial peptides (AMPs) are cationic amphiphilic molecules with α-helix or β-sheet linear motifs and linear or cyclic configurations. For their role in 'defense and offense', they are present in all living organisms. AMPs are named so, as they inhibit a wide array of microbes by membrane pore formation and subsequent perturbation of mitochondrial membrane ionic balance. However, their functional repertoire is expanding with validated roles in cytotoxicity, wound healing, angiogenesis, apoptosis, and chemotaxis [1]...
September 18, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28919413/apolipoprotein-a-i-attenuates-ll-37-induced-endothelial-cell-cytotoxicity
#2
Daniel Svensson, Jens O Lagerstedt, Bengt-Olof Nilsson, Rita Del Giudice
The human cathelicidin peptide LL-37 has antimicrobial and anti-biofilm functions, but LL-37 may also damage the host by triggering inflammation and exerting a cytotoxic effect, thereby reducing host cell viability. Human plasma mitigates LL-37-induced host cell cytotoxicity but the underlying mechanisms are not completely understood. Apolipoprotein A-I (ApoA-I) is a plasma protein endowed with atheroprotective effects. Here, we investigate the interaction between ApoA-I and LL-37 by biochemical techniques, and furthermore assess if ApoA-I protects against LL-37-evoked cytotoxicity in human umbilical vein endothelial cells (HUVEC)...
September 15, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28913556/high-dose-vitamin-d3-supplementation-decreases-the-number-of-colonic-cd103-dendritic-cells-in-healthy-subjects
#3
Nina Friis Bak, M Bendix, S Hald, L Reinert, M K Magnusson, J Agnholt
PURPOSE: Vitamin D may induce tolerance in the intestinal immune system and has been shown to regulate the phenotype of tolerogenic intestinal dendritic cells (DCs) in vitro. It is unknown whether vitamin D supplementation affects human intestinal DCs in vivo, and we aimed to investigate the tolerability and effect on intestinal CD103(+)DCs of high-dose vitamin D3 treatment in healthy subjects. METHODS: Ten healthy subjects received a total of 480,000 IU oral vitamin D3 over 15 days and colonic biopsies were obtained before and after intervention by endoscopy...
September 14, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28910369/heightened-circulating-levels-of-antimicrobial-peptides-in-tuberculosis-diabetes-co-morbidity-and-reversal-upon-treatment
#4
Nathella Pavan Kumar, Kadar Moideen, Vijay Viswanathan, Shanmugam Sivakumar, Pradeep A Menon, Hardy Kornfeld, Subash Babu
BACKGROUND: The association of antimicrobial peptides (AMPs) with tuberculosis-diabetes comorbidity (PTB-DM) is not well understood. METHODS: To study the association of AMPs with PTB-DM, we examined the systemic levels of cathelicidin (LL37), human beta defensin- 2 (HBD2), human neutrophil peptides 1-3, (HNP1-3) and granulysin in individuals with either PTB-DM, PTB, latent TB (LTB) or no TB infection (NTB). RESULTS: Circulating levels of cathelicidin and HBD2 were significantly higher and granulysin levels were significantly lower in PTB-DM compared to PTB, LTB or NTB, while the levels of HNP1-3 were significantly higher in PTB-DM compared to LTB or NTB individuals...
2017: PloS One
https://www.readbyqxmd.com/read/28910167/expression-of-antimicrobial-peptides-by-uveal-and-cutaneous-melanoma-cells-and-investigation-of-their-role-in-tumor-cell-migration-and-vasculogenic-mimicry
#5
Joseph C Manarang, Deborah C Otteson, Alison M McDermott
AIMS: Antimicrobial peptides (AMPs) have been implicated in the pathogenesis of several cancers, although there is also evidence suggesting potential for novel, AMP-based antitumor therapies. Discerning potential roles of AMPs in tumor pathogenesis may provide valuable insight into the mechanisms of novel AMP-based antitumor therapy. METHODS: mRNA expression of the AMPs α defensin (HNP-1); cathelicidin (LL-37); and β defensins (hBD-1, hBD-2, hBD-3, hBD-4) in human uveal and cutaneous melanoma cell lines, primary human uveal melanocytes, and primary human uveal melanoma cells was determined by reverse transcriptase polymerase chain reaction...
September 14, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28890511/the-antibacterial-effects-of-antimicrobial-peptides-op-145-against-clinically-isolated-multi-resistant-strains
#6
Liu Ming, Jian-An Huang
OP-145 is a synthetic antimicrobial peptide developed from the human cathelicidin LL-37. The purpose of this investigation was to evaluate the effect of the antimicrobial peptide OP-145 against clinically isolated drug resistant strains. Ten Methicillin-resistant Staphylococcus aureus (MRSA) strains were obtained from our hospital's clinical inspection center and the activity of OP-145 on growth and biofilm formation on these strains was evaluated by colony counts and scanning electron microscopy. The antimicrobial peptide OP-145 showed significant antibacterial activity against 9 MRSA strains...
September 11, 2017: Japanese Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28883932/effect-of-vitamin-d3-on-the-antimicrobial-activity-of-human-airway-surface-liquid-preliminary-results-of-a-randomised-placebo-controlled-double-blind-trial
#7
Luis G Vargas Buonfiglio, Marlene Cano, Alejandro A Pezzulo, Oriana G Vanegas Calderon, Joseph Zabner, Alicia K Gerke, Alejandro P Comellas
INTRODUCTION: Vitamin D3 supplementation has been reported to prevent lung infections and increase the gene expression of antimicrobial peptides such as cathelicidin. We investigated the effect of vitamin D3 supplementation on the antimicrobial activity of airway surface liquid (ASL) in human subjects. Since smoking can increase the risk of respiratory infections, we also investigated the effect of smoking in the cathelicidin response to vitamin D3 in human airway epithelia in vitro. METHODS: This study is a subanalysis of single-centre community-based randomised placebo-controlled double-blind trial...
2017: BMJ Open Respiratory Research
https://www.readbyqxmd.com/read/28881802/mek-inhibition-enhances-efficacy-of-bacillus-calmette-gu%C3%A3-rin-on-bladder-cancer-cells-by-reducing-release-of-toll-like-receptor-2-activated-antimicrobial-peptides
#8
Young Mi Whang, Su Bin Jin, Serk In Park, In Ho Chang
Bacillus Calmette-Guérin (BCG) is one of the standard treatment options for non-muscle-invasive bladder cancer. The details of the biological defense mechanisms against BCG remain unclear. Here, we investigated whether BCG-induced release of antimicrobial peptides (AMPs; e.g., human β-defensin-2, -3, and cathelicidin) is involved with mitogen-activated protein kinase (MAPK) pathways, and investigated the enhanced anticancer effect of BCG through the down-regulation of Toll-like receptors (TLRs) and MAPK pathways in bladder cancer cells...
August 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/28874446/characterization-of-two-novel-lipopolysaccharide-phosphoethanolamine-transferases-in-pasteurella-multocida-and-their-role-in-resistance-to-cathelicidin-2
#9
Marina Harper, Amy Wright, Frank St Michael, Jianjun Li, Deanna Deveson Lucas, Mark Ford, Ben Adler, Andrew D Cox, John D Boyce
The lipopolysaccharide (LPS) produced by the Gram-negative bacterial pathogen Pasteurella multocida has phosphoethanolamine (PEtn) residues attached to lipid A, 3-deoxy-D-manno-octulosonic acid (Kdo), heptose and galactose. In this study, we show that PEtn is transferred to lipid A by the P. multocida EptA homologue, PetL, and is transferred to galactose by a novel PEtn transferase that is unique to P. multocida called PetG. Transcriptomic analyses indicated that petL expression was positively regulated by the global regulator Fis and negatively regulated by an Hfq-dependent small RNA...
September 5, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28872665/expression-of-human-cathelicidin-peptide-ll-37-in-inflammatory-bowel-disease
#10
Shoko Kusaka, Atsushi Nishida, Kenichiro Takahashi, Shigeki Bamba, Hiroyuki Yasui, Masahiro Kawahara, Osamu Inatomi, Mitsushige Sugimoto, Akira Andoh
Cathelicidin peptide LL-37 plays an important role in the early host response against invading pathogens via its broad-spectrum antimicrobial activity. In this study, we investigated LL-37 expression in the inflamed mucosa of IBD patients. Furthermore, the regulatory mechanism of LL-37 induction was investigated in human colonic subepithelial myofibroblasts (SEMFs). LL-37 mRNA expression and protein secretion were analyzed using real-time polymerase chain reaction and enzyme-linked immunosorbent assay, respectively...
September 5, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28851894/activated-mesenchymal-stem-cells-interact-with-antibiotics-and-host-innate-immune-responses-to-control-chronic-bacterial-infections
#11
Valerie Johnson, Tracy Webb, Annalis Norman, Jonathan Coy, Jade Kurihara, Daniel Regan, Steven Dow
Chronic bacterial infections associated with biofilm formation are often difficult to resolve without extended courses of antibiotic therapy. Mesenchymal stem cells (MSC) exert antibacterial activity in vitro and in acute bacterial infection models, but their activity in chronic infection with biofilm models has not been previously investigated. Therefore, we studied the effects of MSC administration in mouse and dog models of chronic infections associated with biofilms. Mice with chronic Staphylococcus aureus implant infections were treated by i...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28844103/the-mla-pathway-is-critical-for-pseudomonas-aeruginosa-resistance-to-outer-membrane-permeabilization-and-host-innate-immune-clearance
#12
Jason Munguia, Doris L LaRock, Hannah Tsunemoto, Joshua Olson, Ingrid Cornax, Joseph Pogliano, Victor Nizet
Pseudomonas aeruginosa is an important opportunistic pathogen that has become a serious problem due to increased rates of antibiotic resistance. Due to this along with a dearth in novel antibiotic development, especially against Gram-negative pathogens, new therapeutic strategies are needed to prevent a post-antibiotic era. Here, we describe the importance of the vacJ/Mla pathway in resisting bactericidal actions of the host innate immune response. P. aeruginosa tn5 transposon mutants in genes from the VacJ/Mla pathway showed increased susceptibility to killing by the host cathelicidin antimicrobial peptide, LL-37, when compared to the wild-type parent strain...
August 26, 2017: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
https://www.readbyqxmd.com/read/28842784/neutrophil-extracellular-traps-may-contribute-to-interstitial-lung-disease-associated-with-anti-mda5-autoantibody-positive-dermatomyositis
#13
Yun Peng, Suhan Zhang, Yi Zhao, Yi Liu, Bing Yan
In dermatomyositis (DM), anti-melanoma differentiation-associated gene 5 (MDA5) autoantibody (autoAb) marks a subtype with low grade or absent muscle inflammation but frequent and rapidly progressive interstitial lung disease (ILD). The pathogenesis of ILD remains poorly unknown. The aim of the study is to explore whether neutrophil extracellular traps (NETs) are involved in the development of ILD in DM patients with anti-MDA5 autoAb. Patients with clinically amyopathic dermatomyositis (CADM, n = 20), classic dermatomyositis (cDM, n = 30), polymyositis (PM, n = 20), and healthy controls (HC, n = 20) were enrolled...
August 25, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28827496/cerebrospinal-fluid-cathelicidin-correlates-with-the-bacterial-load-and-outcomes-in-childhood-bacterial-meningitis
#14
Okko Savonius, Otto Helve, Irmeli Roine, Sture Andersson, Annika Saukkoriipi, Antonio González Mata, Heikki Peltola, Tuula Pelkonen
BACKGROUND: Large cerebrospinal fluid (CSF) bacterial load in bacterial meningitis (BM) relates to poor outcome. However, the antimicrobial peptide cathelicidin seems important to host defense. We studied how cathelicidin concentrations and bacterial load in CSF relate in childhood BM and to what extent they may predict the disease outcome. METHODS: The patient data originated from a large prospective clinical trial in Latin America in 1996-2003 in which the CSF samples were collected on admission (CSF1) and 12-24 hours later (CSF2)...
August 17, 2017: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/28825769/vitamin-d-cathelicidin-prolactin-autoantibodies-and-cytokines-in-different-forms-of-pulmonary-tuberculosis-versus-sarcoidosis
#15
Irina Vasilyevna Belyaeva, Leonid Pavlovitch Churilov, Liya Robertovnа Mikhailova, Aleksey Vladimirovitch Nikolaev, Anna Andreevna Starshinova, Piotr Kazimirovitch Yablonsky
BACKGROUND: Vitamin D insufficiency is associated with autoimmune and chronic inflammatory diseases such as tuberculosis and sarcoidosis. OBJECTIVES: To evaluate the vitamin D-dependent mechanisms of immunity and autoimmunity in different forms of pulmonary tuberculosis and sarcoidosis. METHODS: We measured the serum levels of 25(OH)D and 1,25(OH)2D, individual autoimmune profiles, plasma concentrations of cathelicidin, several hormones, and production of nine cytokines in patients with short- and long-duration tuberculosis and sarcoidosis...
August 2017: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/28825691/the-myriad-properties-of-pasteurella-multocida-lipopolysaccharide
#16
REVIEW
Marina Harper, John Dallas Boyce
Pasteurella multocida is a heterogeneous species that is a primary pathogen of many different vertebrates. This Gram-negative bacterium can cause a range of diseases, including fowl cholera in birds, haemorrhagic septicaemia in ungulates, atrophic rhinitis in swine, and lower respiratory tract infections in cattle and pigs. One of the primary virulence factors of P. multocida is lipopolysaccharide (LPS). Recent work has shown that this crucial surface molecule shows significant structural variability across different P...
August 21, 2017: Toxins
https://www.readbyqxmd.com/read/28814602/carbon-nanoparticles-inhibit-the-antimicrobial-activities-of-the-human-cathelicidin-ll-37-through-structural-alteration
#17
Fern Findlay, Jan Pohl, Pavel Svoboda, Priyanka Shakamuri, Kevin McLean, Neil F Inglis, Lorna Proudfoot, Peter G Barlow
Host defense peptides, also known as antimicrobial peptides, are key elements of innate host defense. One host defense peptide with well-characterized antimicrobial activity is the human cathelicidin, LL-37. LL-37 has been shown to be upregulated at sites of infection and inflammation and is regarded as one of the primary innate defense molecules against bacterial and viral infection. Human exposure to combustion-derived or engineered nanoparticles is of increasing concern, and the implications of nanomaterial exposure on the human immune response is poorly understood...
August 16, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28801228/identification-of-the-first-cathelicidin-gene-from-skin-of-chinese-giant-salamanders-andrias-davidianus-with-its-potent-antimicrobial-activity
#18
Hui Yang, Baoyue Lu, Dandan Zhou, Lin Zhao, Weijia Song, Lixin Wang
Cathelicidins, as effector molecules, play important roles against infections and represent a crucial component of the innate immune system in vertebrates. They are widely studied in mammals, but little is known in amphibians. In the present study, we report the identification and characterization of a novel cathelicidin from Chinese giant salamander Andrias davidianus, which is the first study in Caudata amphibian. The cDNA sequence encodes a predicted 148-amino-acid polypeptide, which composed of a 20-residue signal peptide, a 94-residue conserved cathelin domain and a 34-residue mature peptide...
August 9, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28798159/as-cath1-6-novel-cathelicidins-with-potent-antimicrobial-and-immunomodulatory-properties-from-alligator-sinensis-play-pivotal-roles-in-host-antimicrobial-immune-responses
#19
Yan Chen, Shasha Cai, Xue Qiao, Mali Wu, Zhilai Guo, Renping Wang, Yi-Qun Kuang, Haining Yu, Yipeng Wang
Crocodilians are regarded as possessing a powerful immune system. However, the composition and action of the crocodilian immune system have remained unclear until now. Cathelicidins, the principal family of host defense peptides, play pivotal roles in vertebrate immune defense against microbial invasions. However, cathelicidins from crocodilians have not been extensively studied to date. In the present study, six novel cathelicidins (As-CATH1-6) were identified and characterized from the endangered Chinese alligator (Alligator sinensis)...
August 10, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28777342/immuno-stimulatory-peptides-as-a-potential-adjunct-therapy-against-intra-macrophagic-pathogens
#20
REVIEW
Tânia Silva, Maria Salomé Gomes
The treatment of infectious diseases is increasingly prone to failure due to the rapid spread of antibiotic-resistant pathogens. Antimicrobial peptides (AMPs) are natural components of the innate immune system of most living organisms. Their capacity to kill microbes through multiple mechanisms makes the development of bacterial resistance less likely. Additionally, AMPs have important immunomodulatory effects, which critically contribute to their role in host defense. In this paper, we review the most recent evidence for the importance of AMPs in host defense against intracellular pathogens, particularly intra-macrophagic pathogens, such as mycobacteria...
August 4, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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