1
|
Jaśkiewicz M, Neubauer D, Sikora K, Bauer M, Bartoszewska S, Błażewicz I, Marek D, Barańska-Rybak W, Kamysz W. The Study of Antistaphylococcal Potential of Omiganan and Retro-Omiganan Under Flow Conditions. Probiotics Antimicrob Proteins 2024:10.1007/s12602-023-10197-w. [PMID: 38224448 DOI: 10.1007/s12602-023-10197-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/27/2023] [Indexed: 01/16/2024]
Abstract
Staphylococcus aureus is considered one of the leading pathogens responsible for infections in humans and animals. The heterogeneous nature of diseases caused by these bacteria is due to the occurrence of multiple strains, differentiated by several mechanisms of antibiotic resistance and virulence factors. One of these is the ability to form biofilm. Biofilm-associated bacteria exhibit a different phenotype that protects them from external factors such as the activity of immune system or antimicrobial substances. Moreover, it has been shown that the majority of persistent and recurrent infections are associated with the presence of the biofilm. Omiganan, an analog of indolicidin - antimicrobial peptide (AMP) derived from bovine neutrophil granules, was found to exhibit high antistaphylococcal and antibiofilm potential. Furthermore, its analog with a reversed sequence (retro-omiganan) was found to display enhanced activity against a variety of pathogens. Based on experience of our group, we found out that counterion exchange can improve the antistaphylococcal activity of AMPs. The aim of this study was to investigate the activity of both compounds against S. aureus biofilm under flow conditions. The advantage of this approach was that it offered the opportunity to form and characterize the biofilm under more controlled conditions. To do this, unique flow cells made of polydimethylsiloxane (PDMS) were developed. The activity against pre-formed biofilm as well as AMPs-treated bacteria was measured. Also, the incorporation of omiganan and retro-omiganan into the channels was conducted to learn whether or not it would inhibit the development of biofilm. The results of the microbiological tests ultimately confirmed the high potential of the omiganan and its retro-analog as well as the importance of counterion exchange in terms of antimicrobial examination. We found out that retro-omiganan trifluoroacetate had the highest biofilm inhibitory properties, however, acetates of both compounds exhibited the highest activity against planktonic and biofilm cultures. Moreover, the developed methodology of investigation under flow conditions allows the implementation of the studies under flow conditions to other compounds.
Collapse
Affiliation(s)
- Maciej Jaśkiewicz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland.
- International Research Agenda 3P-Medicine Laboratory, Medical University of Gdańsk, Building No. 5, Dębinki 7, 80-211, Gdańsk, Poland.
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland.
| | - Karol Sikora
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland.
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Sylwia Bartoszewska
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Izabela Błażewicz
- Department of Dermatology, Venereology and Allergology, Medical University of Gdańsk, Mariana Smoluchowskiego 17, 80-214, Gdańsk, Poland
| | - Dariusz Marek
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Wioletta Barańska-Rybak
- Department of Dermatology, Venereology and Allergology, Medical University of Gdańsk, Mariana Smoluchowskiego 17, 80-214, Gdańsk, Poland
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| |
Collapse
|
2
|
Sikora K, Jędrzejczak J, Bauer M, Neubauer D, Jaśkiewicz M, Szaryńska M. Quaternary Ammonium Salts of Cationic Lipopeptides with Lysine Residues - Synthesis, Antimicrobial, Hemolytic and Cytotoxic Activities. Probiotics Antimicrob Proteins 2023; 15:1465-1483. [PMID: 37770629 PMCID: PMC10687119 DOI: 10.1007/s12602-023-10161-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/13/2023] [Indexed: 09/30/2023]
Abstract
Ultrashort cationic lipopeptides (USCLs) and quaternary ammonium salts constitute two groups of cationic surfactants with high antimicrobial activity. This study aimed to investigate the influence of quaternization of the amino group of the lysine side chain in USCLs on their antimicrobial, hemolytic and cytotoxic activities. To do this, two series of lipopeptides were synthesized, USLCs and their quaternized analogues containing trimethylated lysine residues - qUSCLs (quaternized ultrashort cationic lipopeptides). Quaternization was performed on a resin during a standard solid-phase peptide synthesis with CH3I as the methylating agent. According to our knowledge, this is the first study presenting on-resin peptide quaternization. The lipopeptides were tested for their antibacterial and antifungal activities against the ESKAPE group (Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa and Klebsiella aerogenes) bacteria and Candida glabrata yeast-like fungus. Most of the compounds proved to be active antimicrobial agents with enhanced activity against Gram-positive strains and fungi and a lower against Gram-negative species. In addition, the antimicrobial activity of lipopeptides was increasing with an increase in hydrophobicity but qUSCLs exhibited usually a poorer antimicrobial activity than their parent molecules. Furthermore, the toxicity against red blood cells and human keratinocytes was assessed. It's worth emphasizing that qUSCLs were less toxic than the parent molecules of comparative hydrophobicity. The results of the study proved that qUSCLs can offer a higher selectivity to pathogens over human cells than that of USCLs. Last but not least, quaternization of the peptides could increase their solubility and therefore their bioavailability and utility.
Collapse
Affiliation(s)
- Karol Sikora
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland.
| | - Jakub Jędrzejczak
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Maciej Jaśkiewicz
- International Research Agenda 3P- Medicine Laboratory, Medical University of Gdańsk, Dębinki 7, Building no. 5, 80-211, Gdańsk, Poland
| | - Magdalena Szaryńska
- Department of Histology, Faculty of Medicine, Medical University of Gdańsk, Dębinki 1, 80-211, Gdańsk, Poland
| |
Collapse
|
3
|
Sikorski D, Rosiak P, Janczewski Ł, Potrzebowski MJ, Kregiel D, Kaźmierski S, Neubauer D, Kolesińska B, Frączyk J, Adamczyk A, Draczyński Z. Synthesis and Characterization of Antibacterial Chitosan Films with Ciprofloxacin in Acidic Conditions. Int J Mol Sci 2023; 24:15163. [PMID: 37894841 PMCID: PMC10606985 DOI: 10.3390/ijms242015163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 10/07/2023] [Accepted: 10/09/2023] [Indexed: 10/29/2023] Open
Abstract
This work presents the results of research on obtaining chitosan (CS) films containing on their surface ciprofloxacin (CIP). A unique structure was obtained that not only gives new properties to the films, but also changes the way of coverage and structure of the surface. The spectroscopic test showed that in the process of application of CIP on the surface of CS film, CIP was converted from its crystalline form to an amorphic one, hence improving its bioavailability. This improved its scope of microbiological effect. The research was carried out on the reduction of CIP concentration during the process of CIP adhesion to the surface of chitosan films. The antibacterial activity of the CS films with and without the drug was evaluated in relation to Escherichia coli and Staphylococcus aureus, as well as Candida albicans and Penicillium expansum. Changes in the morphology and roughness of membrane surfaces after the antibacterial molecule adhesion process were tested with atomic force microscopy (AFM) and scanning electron microscopy (SEM). Structural analysis of CS and its modifications were confirmed with Fourier-transform spectroscopy in the infrared by an attenuated total reflectance of IR radiation (FTIR-ATR) and solid-state nuclear magnetic resonance (NMR).
Collapse
Affiliation(s)
- Dominik Sikorski
- Institute of Textile Materials and Polymer Composites, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland;
| | - Piotr Rosiak
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland; (P.R.); (Ł.J.); (J.F.)
| | - Łukasz Janczewski
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland; (P.R.); (Ł.J.); (J.F.)
| | - Marek J. Potrzebowski
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland; (M.J.P.); (S.K.)
| | - Dorota Kregiel
- Department of Environmental Biotechnology, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Wólczańska 171/173, 90-924 Lodz, Poland;
| | - Sławomir Kaźmierski
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland; (M.J.P.); (S.K.)
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-210 Gdansk, Poland;
| | - Beata Kolesińska
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland; (P.R.); (Ł.J.); (J.F.)
| | - Justyna Frączyk
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland; (P.R.); (Ł.J.); (J.F.)
| | - Anna Adamczyk
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, A. Mickiewicza 30 Av., 30-059 Krakow, Poland;
| | - Zbigniew Draczyński
- Institute of Textile Materials and Polymer Composites, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland;
| |
Collapse
|
4
|
Szymczak P, Możejko M, Grzegorzek T, Jurczak R, Bauer M, Neubauer D, Sikora K, Michalski M, Sroka J, Setny P, Kamysz W, Szczurek E. Author Correction: Discovering highly potent antimicrobial peptides with deep generative model HydrAMP. Nat Commun 2023; 14:5129. [PMID: 37612279 PMCID: PMC10447423 DOI: 10.1038/s41467-023-40879-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/25/2023] Open
Affiliation(s)
- Paulina Szymczak
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland
| | - Marcin Możejko
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland
| | - Tomasz Grzegorzek
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland
- NVIDIA, 2788 San Tomas Expressway, Santa Clara, CA, 95051, USA
| | - Radosław Jurczak
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Karol Sikora
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Michał Michalski
- The Centre of New Technologies, University of Warsaw, Stefana Banacha 2c, 02-097, Warsaw, Poland
| | - Jacek Sroka
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland
| | - Piotr Setny
- The Centre of New Technologies, University of Warsaw, Stefana Banacha 2c, 02-097, Warsaw, Poland
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Ewa Szczurek
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland.
| |
Collapse
|
5
|
Wasilewski T, Neubauer D, Wojciechowski M, Szulczyński B, Gębicki J, Kamysz W. Evaluation of Linkers' Influence on Peptide-Based Piezoelectric Biosensors' Sensitivity to Aldehydes in the Gas Phase. Int J Mol Sci 2023; 24:10610. [PMID: 37445789 DOI: 10.3390/ijms241310610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 06/20/2023] [Accepted: 06/23/2023] [Indexed: 07/15/2023] Open
Abstract
Recent findings qualified aldehydes as potential biomarkers for disease diagnosis. One of the possibilities is to use electrochemical biosensors in point-of-care (PoC), but these need further development to overcome some limitations. Currently, the primary goal is to enhance their metrological parameters in terms of sensitivity and selectivity. Previous findings indicate that peptide OBPP4 (KLLFDSLTDLKKKMSEC-NH2) is a promising candidate for further development of aldehyde-sensitive biosensors. To increase the affinity of a receptor layer to long-chain aldehydes, a structure stabilization of the peptide active site via the incorporation of different linkers was studied. Indeed, the incorporation of linkers improved sensitivity to and binding of aldehydes in comparison to that of the original peptide-based biosensor. The tendency to adopt disordered structures was diminished owing to the implementation of suitable linkers. Therefore, to improve the metrological characteristics of peptide-based piezoelectric biosensors, linkers were added at the C-terminus of OBPP4 peptide (KLLFDSLTDLKKKMSE-linker-C-NH2). Those linkers consist of proteinogenic amino acids from group one: glycine, L-proline, L-serine, and non proteinogenic amino acids from group two: β-alanine, 4-aminobutyric acid, and 6-aminohexanoic acid. Linkers were evaluated with in silico studies, followed by experimental verification. All studied linkers enhanced the detection of aldehydes in the gas phase. The highest difference in frequency (60 Hz, nonanal) was observed between original peptide-based biosensors and ones based on peptides modified with the GSGSGS linker. It allowed evaluation of the limit of detection for nonanal at the level of 2 ppm, which is nine times lower than that of the original peptide. The highest sensitivity values were also obtained for the GSGSGS linker: 0.3312, 0.4281, and 0.4676 Hz/ppm for pentanal, octanal, and nonanal, respectively. An order of magnitude increase in sensitivity was observed for the six linkers used. Generally, the linker's rigidity and the number of amino acid residues are much more essential for biosensors' metrological characteristics than the amino acid sequence itself. It was found that the longer the linkers, the better the effect on docking efficiency.
Collapse
Affiliation(s)
- Tomasz Wasilewski
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Hallera 107, 80-416 Gdańsk, Poland
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Hallera 107, 80-416 Gdańsk, Poland
| | - Marek Wojciechowski
- Department of Pharmaceutical Technology and Biochemistry, Chemical Faculty, Gdańsk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdańsk, Poland
| | - Bartosz Szulczyński
- Department of Process Engineering and Chemical Technology, Chemical Faculty, Gdańsk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdańsk, Poland
| | - Jacek Gębicki
- Department of Process Engineering and Chemical Technology, Chemical Faculty, Gdańsk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdańsk, Poland
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Hallera 107, 80-416 Gdańsk, Poland
| |
Collapse
|
6
|
Szymczak P, Możejko M, Grzegorzek T, Jurczak R, Bauer M, Neubauer D, Sikora K, Michalski M, Sroka J, Setny P, Kamysz W, Szczurek E. Discovering highly potent antimicrobial peptides with deep generative model HydrAMP. Nat Commun 2023; 14:1453. [PMID: 36922490 PMCID: PMC10017685 DOI: 10.1038/s41467-023-36994-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 02/28/2023] [Indexed: 03/17/2023] Open
Abstract
Antimicrobial peptides emerge as compounds that can alleviate the global health hazard of antimicrobial resistance, prompting a need for novel computational approaches to peptide generation. Here, we propose HydrAMP, a conditional variational autoencoder that learns lower-dimensional, continuous representation of peptides and captures their antimicrobial properties. The model disentangles the learnt representation of a peptide from its antimicrobial conditions and leverages parameter-controlled creativity. HydrAMP is the first model that is directly optimized for diverse tasks, including unconstrained and analogue generation and outperforms other approaches in these tasks. An additional preselection procedure based on ranking of generated peptides and molecular dynamics simulations increases experimental validation rate. Wet-lab experiments on five bacterial strains confirm high activity of nine peptides generated as analogues of clinically relevant prototypes, as well as six analogues of an inactive peptide. HydrAMP enables generation of diverse and potent peptides, making a step towards resolving the antimicrobial resistance crisis.
Collapse
Affiliation(s)
- Paulina Szymczak
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland
| | - Marcin Możejko
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland
| | - Tomasz Grzegorzek
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland
- NVIDIA, 2788 San Tomas Expressway, Santa Clara, CA, 95051, USA
| | - Radosław Jurczak
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Karol Sikora
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Michał Michalski
- The Centre of New Technologies, University of Warsaw, Stefana Banacha 2c, 02-097, Warsaw, Poland
| | - Jacek Sroka
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland
| | - Piotr Setny
- The Centre of New Technologies, University of Warsaw, Stefana Banacha 2c, 02-097, Warsaw, Poland
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Ewa Szczurek
- Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland.
| |
Collapse
|
7
|
Kamysz E, Sikorska E, Bauer M, Sikora K, Neubauer D. Influence of Lipidation Pattern of the KR12 Fragment of Peptide LL-37 on Its Antibacterial and Hemolytic Activities. Int J Mol Sci 2023; 24:ijms24065505. [PMID: 36982579 PMCID: PMC10053710 DOI: 10.3390/ijms24065505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2023] [Revised: 03/06/2023] [Accepted: 03/10/2023] [Indexed: 03/16/2023] Open
Abstract
Contemporary medicine has been confronted by multidrug resistance. Therefore, new antibiotics are sought to alleviate the problem. In this study, we estimated the effect of the positioning and extent of lipidation (mainly octanoic acid residue) in the KR12-NH2 molecule on antibacterial and hemolytic activities. The effect of the conjugation of benzoic acid derivatives (C6H5-X-COOH, where X: CH2, CH2-CH2, CH=CH, C≡C, and CH2-CH2-CH2) with the N-terminal part of KR12-NH2 on biological activity was also studied. All analogs were tested against planktonic cells of ESKAPE bacteria and reference strains of Staphylococcus aureus. The effect of lipidation site on the helicity of the KR12-NH2 analogs was studied using CD spectroscopy. The ability of the selected peptides to induce the aggregation of POPG liposomes was evaluated with DLS measurements. We demonstrated that both the site and extent of peptide lipidation play an essential role in the bacterial specificity of the lipopeptides. Most of the C8α-KR12-NH2 (II) analogs that were more hydrophobic than the parent compound were also more hemolytic. A similar relationship was also found between the α-helical structure content in POPC and hemolytic activity. It is worth emphasizing that in our study, the highest selectivity against S. aureus strains with an SI value of at least 21.11 exhibited peptide XII obtained by the conjugation of the octanoic acid with the N-terminus of retro-KR12-NH2. All lipidated analogs with the highest net charge (+5) were the most selective toward pathogens. Therefore, the overall charge of KR12-NH2 analogs plays pivotal role in their biological activity.
Collapse
Affiliation(s)
- Elżbieta Kamysz
- Laboratory of Chemistry of Biological Macromolecules, Department of Molecular Biotechnology, Faculty of Chemistry, University of Gdańsk, 80-308 Gdańsk, Poland
- Correspondence: ; Tel.: +48-58-523-5011
| | - Emilia Sikorska
- Laboratory of Structural Studies of Biopolymers, Department of Organic Chemistry, Faculty of Chemistry, University of Gdańsk, 80-308 Gdańsk, Poland
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-210 Gdańsk, Poland
| | - Karol Sikora
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-210 Gdańsk, Poland
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-210 Gdańsk, Poland
| |
Collapse
|
8
|
Stachurski O, Neubauer D, Walewska A, Iłowska E, Bauer M, Bartoszewska S, Sikora K, Hać A, Wyrzykowski D, Prahl A, Kamysz W, Sikorska E. Understanding the Role of Self-Assembly and Interaction with Biological Membranes of Short Cationic Lipopeptides in the Effective Design of New Antibiotics. Antibiotics (Basel) 2022; 11:1491. [PMID: 36358146 PMCID: PMC9686977 DOI: 10.3390/antibiotics11111491] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 10/24/2022] [Accepted: 10/25/2022] [Indexed: 10/22/2023] Open
Abstract
This study investigates short cationic antimicrobial lipopeptides composed of 2-4 amino acid residues and C12-C18 fatty acids attached to the N-terminal part of the peptides. The findings were discussed in the context of the relationship among biological activity, self-assembly, stability, and membrane interactions. All the lipopeptides showed the ability to self-assemble in PBS solution. In most cases, the critical aggregation concentration (CAC) much surpassed the minimal inhibitory concentration (MIC) values, suggesting that monomers are the main active form of lipopeptides. The introduction of β-alanine into the peptide sequence resulted in a compound with a high propensity to fibrillate, which increased the peptide stability and activity against S. epidermidis and C. albicans and reduced the cytotoxicity against human keratinocytes. The results of our study indicated that the target of action of lipopeptides is the bacterial membrane. Interestingly, the type of peptide counterion may affect the degree of penetration of the lipid bilayer. In addition, the binding of the lipopeptide to the membrane of Gram-negative bacteria may lead to the release of calcium ions necessary for stabilization of the lipopolysaccharide layer.
Collapse
Affiliation(s)
- Oktawian Stachurski
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Damian Neubauer
- Faculty of Pharmacy, Medicinal University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| | - Aleksandra Walewska
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Emilia Iłowska
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Marta Bauer
- Faculty of Pharmacy, Medicinal University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| | - Sylwia Bartoszewska
- Faculty of Pharmacy, Medicinal University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| | - Karol Sikora
- Faculty of Pharmacy, Medicinal University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| | - Aleksandra Hać
- Faculty of Biology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland
| | - Dariusz Wyrzykowski
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Adam Prahl
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Wojciech Kamysz
- Faculty of Pharmacy, Medicinal University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| | - Emilia Sikorska
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| |
Collapse
|
9
|
Fioriti S, Cirioni O, Simonetti O, Franca L, Candelaresi B, Pallotta F, Neubauer D, Kamysz E, Kamysz W, Canovari B, Brescini L, Morroni G, Barchiesi F. In Vitro Activity of Novel Lipopeptides against Triazole-Resistant Aspergillus fumigatus. J Fungi (Basel) 2022; 8:jof8080872. [PMID: 36012859 PMCID: PMC9409728 DOI: 10.3390/jof8080872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/12/2022] [Accepted: 08/15/2022] [Indexed: 12/01/2022] Open
Abstract
Aspergillosis, which is mainly sustained by Aspergillus fumigatus, includes a broad spectrum of diseases. They are usually severe in patients with co-morbidities. The first-line therapy includes triazoles, for which an increasing incidence of drug resistance has been lately described. As a consequence of this, the need for new and alternative antifungal molecules is absolutely necessary. As peptides represent promising antimicrobial molecules, two lipopeptides (C14-NleRR-NH2, C14-WRR-NH2) were tested to assess the antifungal activity against azole-resistant A. fumigatus. Antifungal activity was evaluated by determination of minimum inhibitory concentrations (MICs), time–kill curves, XTT assay, optical microscopy, and checkerboard combination with isavuconazole. Both lipopeptides showed antifungal activity, with MICs ranging from 8 mg/L to 16 mg/L, and a dose-dependent effect was confirmed by both time–kill curves and XTT assays. Microscopy showed that hyphae growth was hampered at concentrations equal to or higher than MICs. The rising antifungal resistance highlights the usefulness of novel compounds to treat severe fungal infections. Although further studies assessing the activity of lipopeptides are necessary, these molecules could be effective antifungal alternatives that overcome the current resistances.
Collapse
Affiliation(s)
- Simona Fioriti
- Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, 60126 Ancona, Italy
| | - Oscar Cirioni
- Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, 60126 Ancona, Italy
- Infectious Disease Clinic, Azienda Ospedaliero Universitaria “Ospedali Riuniti”, 60126 Ancona, Italy
| | - Oriana Simonetti
- Dermatological Unit, Department of Clinical and Molecular Sciences, Polytechnic University of Marche, 60126 Ancona, Italy
| | - Lucia Franca
- Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, 60126 Ancona, Italy
- Infectious Diseases Unit, Azienda Ospedaliera Ospedali Riuniti Marche Nord, 61122 Pesaro, Italy
| | - Bianca Candelaresi
- Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, 60126 Ancona, Italy
- Infectious Disease Clinic, Azienda Ospedaliero Universitaria “Ospedali Riuniti”, 60126 Ancona, Italy
| | - Francesco Pallotta
- Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, 60126 Ancona, Italy
- Infectious Disease Clinic, Azienda Ospedaliero Universitaria “Ospedali Riuniti”, 60126 Ancona, Italy
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-210 Gdańsk, Poland
| | - Elzbieta Kamysz
- Laboratory of Chemistry of Biological Macromolecules, Department of Molecular Biotechnology, Faculty of Chemistry, University of Gdańsk, 80-309 Gdańsk, Poland
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-210 Gdańsk, Poland
| | - Benedetta Canovari
- Infectious Diseases Unit, Azienda Ospedaliera Ospedali Riuniti Marche Nord, 61122 Pesaro, Italy
| | - Lucia Brescini
- Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, 60126 Ancona, Italy
- Infectious Disease Clinic, Azienda Ospedaliero Universitaria “Ospedali Riuniti”, 60126 Ancona, Italy
| | - Gianluca Morroni
- Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, 60126 Ancona, Italy
- Correspondence: ; Tel.: +39-0712206298; Fax: +39-0712206297
| | - Francesco Barchiesi
- Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, 60126 Ancona, Italy
- Infectious Diseases Unit, Azienda Ospedaliera Ospedali Riuniti Marche Nord, 61122 Pesaro, Italy
| |
Collapse
|
10
|
Salzmann M, Ferrachat S, Tully C, Münch S, Watson‐Parris D, Neubauer D, Siegenthaler‐Le Drian C, Rast S, Heinold B, Crueger T, Brokopf R, Mülmenstädt J, Quaas J, Wan H, Zhang K, Lohmann U, Stier P, Tegen I. The Global Atmosphere-aerosol Model ICON-A-HAM2.3-Initial Model Evaluation and Effects of Radiation Balance Tuning on Aerosol Optical Thickness. J Adv Model Earth Syst 2022; 14:e2021MS002699. [PMID: 35860306 PMCID: PMC9285428 DOI: 10.1029/2021ms002699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 02/28/2022] [Accepted: 03/12/2022] [Indexed: 06/15/2023]
Abstract
The Hamburg Aerosol Module version 2.3 (HAM2.3) from the ECHAM6.3-HAM2.3 global atmosphere-aerosol model is coupled to the recently developed icosahedral nonhydrostatic ICON-A (icon-aes-1.3.00) global atmosphere model to yield the new ICON-A-HAM2.3 atmosphere-aerosol model. The ICON-A and ECHAM6.3 host models use different dynamical cores, parameterizations of vertical mixing due to sub-grid scale turbulence, and parameter settings for radiation balance tuning. Here, we study the role of the different host models for simulated aerosol optical thickness (AOT) and evaluate impacts of using HAM2.3 and the ECHAM6-HAM2.3 two-moment cloud microphysics scheme on several meteorological variables. Sensitivity runs show that a positive AOT bias over the subtropical oceans is remedied in ICON-A-HAM2.3 because of a different default setting of a parameter in the moist convection parameterization of the host models. The global mean AOT is biased low compared to MODIS satellite instrument retrievals in ICON-A-HAM2.3 and ECHAM6.3-HAM2.3, but the bias is larger in ICON-A-HAM2.3 because negative AOT biases over the Amazon, the African rain forest, and the northern Indian Ocean are no longer compensated by high biases over the sub-tropical oceans. ICON-A-HAM2.3 shows a moderate improvement with respect to AOT observations at AERONET sites. A multivariable bias score combining biases of several meteorological variables into a single number is larger in ICON-A-HAM2.3 compared to standard ICON-A and standard ECHAM6.3. In the tropics, this multivariable bias is of similar magnitude in ICON-A-HAM2.3 and in ECHAM6.3-HAM2.3. In the extra-tropics, a smaller multivariable bias is found for ICON-A-HAM2.3 than for ECHAM6.3-HAM2.3.
Collapse
Affiliation(s)
- M. Salzmann
- Institute for MeteorologyUniversität LeipzigLeipzigGermany
| | - S. Ferrachat
- Institute of Atmospheric and Climate ScienceETH ZürichZürichSwitzerland
| | - C. Tully
- Institute of Atmospheric and Climate ScienceETH ZürichZürichSwitzerland
| | - S. Münch
- Institute of Atmospheric and Climate ScienceETH ZürichZürichSwitzerland
| | - D. Watson‐Parris
- Atmospheric, Oceanic and Planetary PhysicsDepartment of PhysicsUniversity of OxfordOxfordUK
| | - D. Neubauer
- Institute of Atmospheric and Climate ScienceETH ZürichZürichSwitzerland
| | | | - S. Rast
- Max Planck Institute for MeteorologyHamburgGermany
| | - B. Heinold
- Leibniz Institute for Tropospheric ResearchLeipzigGermany
| | - T. Crueger
- Max Planck Institute for MeteorologyHamburgGermany
| | - R. Brokopf
- Max Planck Institute for MeteorologyHamburgGermany
| | - J. Mülmenstädt
- Institute for MeteorologyUniversität LeipzigLeipzigGermany
- Now at Pacific Northwest National LaboratoryRichlandWAUSA
| | - J. Quaas
- Institute for MeteorologyUniversität LeipzigLeipzigGermany
| | - H. Wan
- Pacific Northwest National LaboratoryRichlandWAUSA
| | - K. Zhang
- Pacific Northwest National LaboratoryRichlandWAUSA
| | - U. Lohmann
- Institute of Atmospheric and Climate ScienceETH ZürichZürichSwitzerland
| | - P. Stier
- Atmospheric, Oceanic and Planetary PhysicsDepartment of PhysicsUniversity of OxfordOxfordUK
| | - I. Tegen
- Leibniz Institute for Tropospheric ResearchLeipzigGermany
| |
Collapse
|
11
|
Rząd K, Paluszkiewicz E, Neubauer D, Olszewski M, Kozłowska-Tylingo K, Kamysz W, Gabriel I. The Effect of Conjugation with Octaarginine, a Cell-Penetrating Peptide on Antifungal Activity of Imidazoacridinone Derivative. Int J Mol Sci 2021; 22:ijms222413190. [PMID: 34947987 PMCID: PMC8705783 DOI: 10.3390/ijms222413190] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/26/2021] [Accepted: 12/02/2021] [Indexed: 12/31/2022] Open
Abstract
Acridine cell-penetrating peptide conjugates are an extremely important family of compounds in antitumor chemotherapy. These conjugates are not so widely analysed in antimicrobial therapy, although bioactive peptides could be used as nanocarriers to smuggle antimicrobial compounds. An octaarginine conjugate of an imidazoacridinone derivative (Compound 1-R8) synthetized by us exhibited high antifungal activity against reference and fluconazole-resistant clinical strains (MICs ≤ 4 μg mL−1). Our results clearly demonstrate the qualitative difference in accumulation of the mother compound and Compound 1-R8 conjugate into fungal cells. Only the latter was transported and accumulated effectively. Microscopic and flow cytometry analysis provide some evidence that the killing activity of Compound 1-R8 may be associated with a change in the permeability of the fungal cell membrane. The conjugate exhibited low cytotoxicity against human embryonic kidney (HEK-293) and human liver (HEPG2) cancer cell lines. Nevertheless, the selectivity index value of the conjugate for human pathogenic strains remained favourable and no hemolytic activity was observed. The inhibitory effect of the analysed compound on yeast topoisomerase II activity suggested its molecular target. In summary, conjugation with R8 effectively increased imidazoacridinone derivative ability to enter the fungal cell and achieve a concentration inside the cell that resulted in a high antifungal effect.
Collapse
Affiliation(s)
- Kamila Rząd
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry and BioTechMed Center, Gdańsk University of Technology, 11/12 Narutowicza Str., 80-233 Gdańsk, Poland; (K.R.); (E.P.); (M.O.); (K.K.-T.)
| | - Ewa Paluszkiewicz
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry and BioTechMed Center, Gdańsk University of Technology, 11/12 Narutowicza Str., 80-233 Gdańsk, Poland; (K.R.); (E.P.); (M.O.); (K.K.-T.)
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Gen. J. Hallera 107th Avenue, 80-416 Gdańsk, Poland; (D.N.); (W.K.)
| | - Mateusz Olszewski
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry and BioTechMed Center, Gdańsk University of Technology, 11/12 Narutowicza Str., 80-233 Gdańsk, Poland; (K.R.); (E.P.); (M.O.); (K.K.-T.)
| | - Katarzyna Kozłowska-Tylingo
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry and BioTechMed Center, Gdańsk University of Technology, 11/12 Narutowicza Str., 80-233 Gdańsk, Poland; (K.R.); (E.P.); (M.O.); (K.K.-T.)
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Gen. J. Hallera 107th Avenue, 80-416 Gdańsk, Poland; (D.N.); (W.K.)
| | - Iwona Gabriel
- Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry and BioTechMed Center, Gdańsk University of Technology, 11/12 Narutowicza Str., 80-233 Gdańsk, Poland; (K.R.); (E.P.); (M.O.); (K.K.-T.)
- Correspondence: ; Tel.: +48-58-348-6078; Fax: +48-58-347-1144
| |
Collapse
|
12
|
Kotynia A, Wiatrak B, Kamysz W, Neubauer D, Jawień P, Marciniak A. Cationic Peptides and Their Cu(II) and Ni(II) Complexes: Coordination and Biological Characteristics. Int J Mol Sci 2021; 22:ijms222112028. [PMID: 34769458 PMCID: PMC8584440 DOI: 10.3390/ijms222112028] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 10/26/2021] [Accepted: 10/27/2021] [Indexed: 01/20/2023] Open
Abstract
Antimicrobial peptides are a promising group of compounds used for the treatment of infections. In some cases, metal ions are essential to activate these molecules. Examples of metalloantibiotics are, for instance, bleomycin and dermcidin. This study is focused on three new pseudopeptides with potential biological activity. The coordination behavior of all ligands with Cu(II) and Ni(II) ions has been examined. Various analytical methods such as potentiometric titration, UV-Vis and CD spectroscopies, and mass spectrometry were used. All compounds are convenient chelators for metal ion-binding. Two of the ligands tested have histidine residues. Surprisingly, imidazole nitrogen is not involved in the coordination of the metal ion. The N-terminal amino group, Dab side chains, and amide nitrogen atoms of the peptide bonds coordinated Cu(II) and Ni(II) in all the complexes formed. The cytotoxicity of three pseudopeptides and their complexes was evaluated. Moreover, their other model allowed for assessing the attenuation of LPS-induced cytotoxicity and anti-inflammatory activities were also evaluated, the results of which revealed to be very promising.
Collapse
Affiliation(s)
- Aleksandra Kotynia
- Department of Inorganic Chemistry, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland
- Correspondence: (A.K.); (A.M.); Tel.: +48-71-784-03-35 (A.K.)
| | - Benita Wiatrak
- Department of Pharmacology, Wroclaw Medical University, Jana Mikulicza-Radeckiego 2, 50-345 Wroclaw, Poland; (B.W.); (P.J.)
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Medical University of Gdańsk, Gen. J. Hallera 107, 80-416 Gdańsk, Poland; (W.K.); (D.N.)
| | - Damian Neubauer
- Department of Inorganic Chemistry, Medical University of Gdańsk, Gen. J. Hallera 107, 80-416 Gdańsk, Poland; (W.K.); (D.N.)
| | - Paulina Jawień
- Department of Pharmacology, Wroclaw Medical University, Jana Mikulicza-Radeckiego 2, 50-345 Wroclaw, Poland; (B.W.); (P.J.)
- Department of Biostructure and Animal Physiology, Wroclaw University of Environmental and Life Sciences, Norwida 25/27, 50-375 Wroclaw, Poland
| | - Aleksandra Marciniak
- Department of Inorganic Chemistry, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland
- Correspondence: (A.K.); (A.M.); Tel.: +48-71-784-03-35 (A.K.)
| |
Collapse
|
13
|
Czechowicz P, Neubauer D, Nowicka J, Kamysz W, Gościniak G. Antifungal Activity of Linear and Disulfide-Cyclized Ultrashort Cationic Lipopeptides Alone and in Combination with Fluconazole against Vulvovaginal Candida spp. Pharmaceutics 2021; 13:pharmaceutics13101589. [PMID: 34683882 PMCID: PMC8537571 DOI: 10.3390/pharmaceutics13101589] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 09/26/2021] [Accepted: 09/28/2021] [Indexed: 01/10/2023] Open
Abstract
Vulvovaginal candidiasis (VVC) occurs in over 75% of women at least once during their lifetime and is an infection that significantly affects their health. Candida strains resistant to standard azole antifungal therapy and relapses of VVC are more and more common. Hypothetically, biofilm is one of the main reasons of relapses and failure of the therapy. Ultrashort cationic lipopeptides (USCLs) exhibit high antimicrobial activities. Our previous study on USCLs revealed that disulfide cyclization can result in selective antifungal compounds. Therefore, four USCL were selected and their antifungal activity were studied on 62 clinical strains isolated from VVC. The results confirmed previous premises that cyclic analogs have increased selectivity between fungal cells and keratinocytes and improved anticandidal activity compared to their linear analogs against both planktonic and biofilm cultures. On the other hand, linear lipopeptides in combination with fluconazole showed a synergistic effect. It was found that the minimum inhibitory concentrations of the tested compounds in combination with fluconazole were at least four times lower than when used separately. Our results indicate that combination therapy of VVC with USCLs and fluconazole at low non-toxic concentrations can be beneficial owing to the synergistic effect. However, further in vivo studies are needed to confirm this hypothesis.
Collapse
Affiliation(s)
- Paulina Czechowicz
- Department of Microbiology, Faculty of Medicine, Wrocław Medical University, 51-368 Wrocław, Poland; (J.N.); (G.G.)
- Correspondence: ; Tel.: +48-71-784-13-01
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-210 Gdańsk, Poland; (D.N.); (W.K.)
| | - Joanna Nowicka
- Department of Microbiology, Faculty of Medicine, Wrocław Medical University, 51-368 Wrocław, Poland; (J.N.); (G.G.)
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-210 Gdańsk, Poland; (D.N.); (W.K.)
| | - Grażyna Gościniak
- Department of Microbiology, Faculty of Medicine, Wrocław Medical University, 51-368 Wrocław, Poland; (J.N.); (G.G.)
| |
Collapse
|
14
|
Żyrek D, Wajda A, Czechowicz P, Nowicka J, Jaśkiewicz M, Neubauer D, Kamysz W. The Antimicrobial Activity of Omiganan Alone and In Combination against Candida Isolated from Vulvovaginal Candidiasis and Bloodstream Infections. Antibiotics (Basel) 2021; 10:antibiotics10081001. [PMID: 34439051 PMCID: PMC8389017 DOI: 10.3390/antibiotics10081001] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/15/2021] [Accepted: 08/17/2021] [Indexed: 12/25/2022] Open
Abstract
Fungi from the Candida genus are widespread commensals and, at the same time, are the leading cause of fungal infections worldwide. For instance, vulvovaginal candidiasis (VVC) affects approximately 75% of women at least once in their lifetime, remaining the second most common gynecological infection. On the contrary, hospital-acquired fungal bloodstream infections (BSIs), although less frequent, are characterized by a high mortality rate. Undoubtedly, the main reason for this situation are virulence factors that these yeast-like fungi can produce, and the ability to form a biofilm is one of the most important of them. Due to the low effectiveness of classic antimycotics against Candida biofilms, an intense search for new drugs capable of eradicating this structure is highly demanded. One of the most promising groups of compounds exhibiting such properties are antimicrobial peptides (AMPs). This study focuses on a comparison of the efficacy of Omiganan and fluconazole alone and in combination against Candida strains isolated from BSIs. The obtained results are consistent with our previous reports on the effectiveness of Omiganan against clinical strains isolated from VVC. This is also the first report on the combinatory application of Omiganan in the context of fungal BSI. The majority of combinations with fluconazole showed an additive effect, as well as a synergistic effect in the range of certain concentrations. Importantly, such effects are visible at concentrations much lower than for those compounds used individually. Potentially, this entails the possibility of limiting the adverse effects (e.g., toxicity) of Omiganan and fluconazole applied in vivo, thus improving the safety profile of this particular antifungal therapy.
Collapse
Affiliation(s)
- Dawid Żyrek
- Department of Microbiology, Faculty of Medicine, Wrocław Medical University, 50-367 Wrocław, Poland; (D.Ż.); (A.W.)
| | - Andrzej Wajda
- Department of Microbiology, Faculty of Medicine, Wrocław Medical University, 50-367 Wrocław, Poland; (D.Ż.); (A.W.)
| | - Paulina Czechowicz
- Department of Microbiology, Faculty of Medicine, Wrocław Medical University, 50-367 Wrocław, Poland; (D.Ż.); (A.W.)
- Correspondence: (P.C.); (J.N.)
| | - Joanna Nowicka
- Department of Microbiology, Faculty of Medicine, Wrocław Medical University, 50-367 Wrocław, Poland; (D.Ż.); (A.W.)
- Correspondence: (P.C.); (J.N.)
| | - Maciej Jaśkiewicz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (D.N.); (W.K.)
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (D.N.); (W.K.)
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (D.N.); (W.K.)
| |
Collapse
|
15
|
Czechowicz P, Jaśkiewicz M, Neubauer D, Gościniak G, Kamysz W. Anticandidal Activity of Omiganan and Its Retro Analog Alone and in Combination with Fluconazole. Probiotics Antimicrob Proteins 2021; 13:1173-1182. [PMID: 33655458 PMCID: PMC8342346 DOI: 10.1007/s12602-021-09757-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/14/2021] [Indexed: 01/10/2023]
Abstract
Vulvovaginal candidiasis (VVC) is a vaginal infection that manifests itself as several symptoms which can lead to various life-threatening complications. The majority of VVC is caused by Candida albicans strains, and it is estimated that approximately 75% of women worldwide would suffer from this condition at least once during their lifetime. Surprisingly, the detailed pathomechanism of yeast-like fungi invasions in vagina is not yet fully understood. However, the ability to form biofilm on vaginal mucosa is considered as one of the critical factors associated with failure of the therapy and recurrences of the disease. Antimicrobial peptides (AMPs) are a promising class of compounds that are receiving a growing interest owing to their antibacterial, antifungal, and antibiofilm properties. Omiganan is a synthetic analog of Indolicidin that is characterized by wide spectrum of antimicrobial and antibiofilm activities. Recent reports suggest improved activity of analogs with a reversed sequence (retro-analog concept). Therefore, Omiganan and its retro analog were tested against planktonic forms and biofilm of 18 Candida strains isolated from VVC. Moreover, the synergy between the AMPs and fluconazole was studied as well. The AMPs appeared to be effective against C. albicans biofilm, and the reversion of the sequence generally led to an improved antimicrobial activity. Furthermore, confocal and scanning electron microscopic visualizations revealed the effectiveness of AMPs-fluconazole combinations also against fluconazole-resistant strains.
Collapse
Affiliation(s)
- Paulina Czechowicz
- Department of Microbiology, Faculty of Medicine, Wroclaw Medical University, Wroclaw, Poland.
| | - Maciej Jaśkiewicz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Gdansk, Poland
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Gdansk, Poland
| | - Grażyna Gościniak
- Department of Microbiology, Faculty of Medicine, Wroclaw Medical University, Wroclaw, Poland
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Gdansk, Poland
| |
Collapse
|
16
|
Neubauer D, Jaśkiewicz M, Bauer M, Olejniczak-Kęder A, Sikorska E, Sikora K, Kamysz W. Biological and Physico-Chemical Characteristics of Arginine-Rich Peptide Gemini Surfactants with Lysine and Cystine Spacers. Int J Mol Sci 2021; 22:3299. [PMID: 33804887 PMCID: PMC8036666 DOI: 10.3390/ijms22073299] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 03/19/2021] [Accepted: 03/20/2021] [Indexed: 12/11/2022] Open
Abstract
Ultrashort cationic lipopeptides (USCLs) and gemini cationic surfactants are classes of potent antimicrobials. Our recent study has shown that the branching and shortening of the fatty acids chains with the simultaneous addition of a hydrophobic N-terminal amino acid in USCLs result in compounds with enhanced selectivity. Here, this approach was introduced into arginine-rich gemini cationic surfactants. l-cystine diamide and l-lysine amide linkers were used as spacers. Antimicrobial activity against planktonic and biofilm cultures of ESKAPE (Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter spp.) strains and Candida sp. as well as hemolytic and cytotoxic activities were examined. Moreover, antimicrobial activity in the presence of human serum and the ability to form micelles were evaluated. Membrane permeabilization study, serum stability assay, and molecular dynamics were performed. Generally, critical aggregation concentration was linearly correlated with hydrophobicity. Gemini surfactants were more active than the parent USCLs, and they turned out to be selective antimicrobial agents with relatively low hemolytic and cytotoxic activities. Geminis with the l-cystine diamide spacer seem to be less cytotoxic than their l-lysine amide counterparts, but they exhibited lower antibiofilm and antimicrobial activities in serum. In some cases, geminis with branched fatty acid chains and N-terminal hydrophobic amino acid resides exhibited enhanced selectivity to pathogens over human cells.
Collapse
Affiliation(s)
- Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (M.B.); (K.S.); (W.K.)
| | - Maciej Jaśkiewicz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (M.B.); (K.S.); (W.K.)
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (M.B.); (K.S.); (W.K.)
| | - Agata Olejniczak-Kęder
- Department of Histology, Faculty of Medicine, Medical University of Gdańsk, 80-211 Gdańsk, Poland;
| | - Emilia Sikorska
- Department of Organic Chemistry, Faculty of Chemistry, University of Gdańsk, 80-308 Gdańsk, Poland;
| | - Karol Sikora
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (M.B.); (K.S.); (W.K.)
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (M.B.); (K.S.); (W.K.)
| |
Collapse
|
17
|
Mulder PA, van Balkom IDC, Landlust AM, Priolo M, Menke LA, Acero IH, Alkuraya FS, Arias P, Bernardini L, Bijlsma EK, Cole T, Coubes C, Dapia I, Davies S, Di Donato N, Elcioglu NH, Fahrner JA, Foster A, González NG, Huber I, Iascone M, Kaiser AS, Kamath A, Kooblall K, Lapunzina P, Liebelt J, Lynch SA, Maas SM, Mammì C, Mathijssen IB, McKee S, Mirzaa GM, Montgomery T, Neubauer D, Neumann TE, Pintomalli L, Pisanti MA, Plomp AS, Price S, Salter C, Santos-Simarro F, Sarda P, Schanze D, Segovia M, Shaw-Smith C, Smithson S, Suri M, Tatton-Brown K, Tenorio J, Thakker RV, Valdez RM, Van Haeringen A, Van Hagen JM, Zenker M, Zollino M, Dunn WW, Piening S, Hennekam RC. Development, behaviour and sensory processing in Marshall-Smith syndrome and Malan syndrome: phenotype comparison in two related syndromes. J Intellect Disabil Res 2020; 64:956-969. [PMID: 33034087 PMCID: PMC8957705 DOI: 10.1111/jir.12787] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 08/19/2020] [Accepted: 09/15/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Ultrarare Marshall-Smith and Malan syndromes, caused by changes of the gene nuclear factor I X (NFIX), are characterised by intellectual disability (ID) and behavioural problems, although questions remain. Here, development and behaviour are studied and compared in a cross-sectional study, and results are presented with genetic findings. METHODS Behavioural phenotypes are compared of eight individuals with Marshall-Smith syndrome (three male individuals) and seven with Malan syndrome (four male individuals). Long-term follow-up assessment of cognition and adaptive behaviour was possible in three individuals with Marshall-Smith syndrome. RESULTS Marshall-Smith syndrome individuals have more severe ID, less adaptive behaviour, more impaired speech and less reciprocal interaction compared with individuals with Malan syndrome. Sensory processing difficulties occur in both syndromes. Follow-up measurement of cognition and adaptive behaviour in Marshall-Smith syndrome shows different individual learning curves over time. CONCLUSIONS Results show significant between and within syndrome variability. Different NFIX variants underlie distinct clinical phenotypes leading to separate entities. Cognitive, adaptive and sensory impairments are common in both syndromes and increase the risk of challenging behaviour. This study highlights the value of considering behaviour within developmental and environmental context. To improve quality of life, adaptations to environment and treatment are suggested to create a better person-environment fit.
Collapse
Affiliation(s)
- P A Mulder
- Autism Team Northern-Netherlands, Jonx Department of (Youth) Mental Health and Autism, Lentis Psychiatric Institute, Groningen, Netherlands
| | - I D C van Balkom
- Autism Team Northern-Netherlands, Jonx Department of (Youth) Mental Health and Autism, Lentis Psychiatric Institute, Groningen, Netherlands
- Rob Giel Research Centre, Department of Psychiatry, University Medical Center Groningen, Groningen, Netherlands
| | - A M Landlust
- Autism Team Northern-Netherlands, Jonx Department of (Youth) Mental Health and Autism, Lentis Psychiatric Institute, Groningen, Netherlands
| | - M Priolo
- Unità Operativa di Genetica Medica, Grande Ospedale Metropolitano Bianchi-Melacrino-Morelli, Reggio Calabria, Italy
| | - L A Menke
- Department of Paediatrics, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - I H Acero
- Genetics Unit, Hospital Universitario Central de Asturias, Oviedo, Spain
| | - F S Alkuraya
- Saudi Human Genome Project, King Abdulaziz City for Science and Technology, and Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - P Arias
- Institute of Medical and Molecular Genetics (INGEMM), Hospital Universitario La Paz, IdiPAZ, Universidad Autónoma de Madrid, and CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain
| | - L Bernardini
- Cytogenetics Unit, Casa Sollievo della Sofferenza Foundation, San Giovanni Rotondo, Italy
| | - E K Bijlsma
- Department of Clinical Genetics, Leiden University Medical Centre, Leiden, Netherlands
| | - T Cole
- Department of Clinical Genetics, Birmingham Women's and Children's NHS Foundation Trust, Birmingham, UK
| | - C Coubes
- Département de Génétique Médicale, Hôpital Arnaud de Villeneuve, CHRU Montpellier, Montpellier, France
| | - I Dapia
- Institute of Medical and Molecular Genetics (INGEMM), Hospital Universitario La Paz, IdiPAZ, Universidad Autónoma de Madrid, and CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain
| | - S Davies
- Institute of Medical Genetics, University Hospital of Wales, Cardiff, UK
| | - N Di Donato
- Institute for Clinical Genetics, TU Dresden, Dresden, Germany
| | - N H Elcioglu
- Department of Pediatric Genetics, Marmara University Medical School, Istanbul and Eastern Mediterranean University, Mersin, Turkey
| | - J A Fahrner
- McKusick-Nathans Institute of Genetic Medicine, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - A Foster
- Institute of Cancer and Genomic Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - N G González
- Unit Hospital Universitario Central de Asturias, Oviedo, Spain
| | - I Huber
- Sørland Hospital, Kristiansand, Norway
| | - M Iascone
- Medical Genetics Laboratory, ASST Papa Giovanni XXIII, Bergamo, Italy
| | - A-S Kaiser
- Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
| | - A Kamath
- Institute of Medical Genetics, University Hospital of Wales, Cardiff, UK
| | - K Kooblall
- Academic Endocrine Unit, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - P Lapunzina
- Institute of Medical and Molecular Genetics (INGEMM), Hospital Universitario La Paz, IdiPAZ, Universidad Autónoma de Madrid, and CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain
| | - J Liebelt
- South Australian Clinical Genetics Services, Women's and Children's Hospital, North Adelaide, Australia
| | - S A Lynch
- UCD Academic Centre on Rare Diseases, School of Medicine and Medical Sciences, University College Dublin, and Clinical Genetics, Temple Street Children's University Hospital, Dublin, Ireland
| | - S M Maas
- Department of Clinical Genetics, Academic Medical Center, Amsterdam, Netherlands
| | - C Mammì
- Unità Operativa di Genetica Medica, Grande Ospedale Metropolitano Bianchi-Melacrino-Morelli, Reggio Calabria, Italy
| | - I B Mathijssen
- Department of Clinical Genetics, Academic Medical Center, Amsterdam, Netherlands
| | - S McKee
- Northern Ireland Regional Genetics Service, Belfast Health and Social Care Trust, Belfast, UK
| | - G M Mirzaa
- Center for Integrative Brain Research, Seattle Children's Research Institute, and Division of Genetic Medicine, University of Washington School of Medicine, Seattle, WA, USA
| | - T Montgomery
- Newcastle upon Tyne NHS Foundation Trust, Newcastle upon Tyne, UK
| | - D Neubauer
- Institute of Human Genetics, University Hospital Magdeburg, Magdeburg, Germany
| | - T E Neumann
- Mitteldeutscher Praxisverbund Humangenetik, Halle, Germany
| | - L Pintomalli
- Unità Operativa di Genetica Medica, Grande Ospedale Metropolitano Bianchi-Melacrino-Morelli, Reggio Calabria, Italy
| | - M A Pisanti
- Medical Genetic and Laboratory Unit, "Antonio Cardarelli" Hospital, Naples, Italy
| | - A S Plomp
- Department of Clinical Genetics, Academic Medical Center, Amsterdam, Netherlands
| | - S Price
- Department of Clinical Genetics, Northampton General Hospital NHS Trust, Northampton, UK
| | - C Salter
- Wessex Clinical Genetics Service, Princess Ann Hospital, Southampton, UK
| | - F Santos-Simarro
- Institute of Medical and Molecular Genetics (INGEMM), Hospital Universitario La Paz, IdiPAZ, Universidad Autónoma de Madrid, and CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain
| | - P Sarda
- Département de Génétique Médicale, Hôpital Arnaud de Villeneuve, CHRU Montpellier, Montpellier, France
| | - D Schanze
- Institute of Human Genetics, University Hospital Magdeburg, Magdeburg, Germany
| | - M Segovia
- CENAGEM, Centro Nacional de Genética, Buenos Aires, Argentina
| | - C Shaw-Smith
- Royal Devon and Exeter NHS Foundation Trust, Exeter, UK
| | - S Smithson
- University Hospitals Bristol NHS Trust, Bristol, UK
| | - M Suri
- Nottingham Clinical Genetics Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - K Tatton-Brown
- Division of Genetics and Epidemiology, Institute of Cancer Research, London and South West Thames Regional Genetics Service, St. George's University Hospitals NHS Foundation Trust, London, UK
| | - J Tenorio
- Institute of Medical and Molecular Genetics (INGEMM), Hospital Universitario La Paz, IdiPAZ, Universidad Autónoma de Madrid, and CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras, ISCIII, Madrid, Spain
| | - R V Thakker
- Academic Endocrine Unit, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - R M Valdez
- Genetics Unit, Hospital Militar Central "Cirujano Mayor Dr. Cosme Argerich", Buenos Aires, Argentina
| | - A Van Haeringen
- Department of Clinical Genetics, Leiden University Medical Centre, Leiden, Netherlands
| | - J M Van Hagen
- Department of Clinical Genetics, VU University Medical Centre, Amsterdam, Netherlands
| | - M Zenker
- Institute of Human Genetics, University Hospital Magdeburg, Magdeburg, Germany
| | - M Zollino
- Department of Laboratory Medicine, Institute of Medical Genetics, Catholic University, Rome, Italy
| | - W W Dunn
- Department of Occupational Therapy Education, School of Health Professions, University of Missouri, Columbia, MO, USA
| | - S Piening
- Autism Team Northern-Netherlands, Jonx Department of (Youth) Mental Health and Autism, Lentis Psychiatric Institute, Groningen, Netherlands
- Rob Giel Research Centre, Department of Psychiatry, University Medical Center Groningen, Groningen, Netherlands
| | - R C Hennekam
- Autism Team Northern-Netherlands, Jonx Department of (Youth) Mental Health and Autism, Lentis Psychiatric Institute, Groningen, Netherlands
- Department of Paediatrics, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| |
Collapse
|
18
|
Neubauer D, Jaśkiewicz M, Sikorska E, Bartoszewska S, Bauer M, Kapusta M, Narajczyk M, Kamysz W. Effect of Disulfide Cyclization of Ultrashort Cationic Lipopeptides on Antimicrobial Activity and Cytotoxicity. Int J Mol Sci 2020; 21:E7208. [PMID: 33003569 PMCID: PMC7582905 DOI: 10.3390/ijms21197208] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 09/21/2020] [Accepted: 09/22/2020] [Indexed: 12/20/2022] Open
Abstract
Ultrashort cationic lipopeptides (USCLs) are considered to be a promising class of antimicrobials with high activity against a broad-spectrum of microorganisms. However, the majority of these compounds are characterized by significant toxicity toward human cells, which hinders their potential application. To overcome those limitations, several approaches have been advanced. One of these is disulfide cyclization that has been shown to improve drug-like characteristics of peptides. In this article the effect of disulfide cyclization of the polar head of N-palmitoylated USCLs on in vitro biological activity has been studied. Lipopeptides used in this study consisted of three or four basic amino acids (lysine and arginine) and cystine in a cyclic peptide. In general, disulfide cyclization of the lipopeptides resulted in peptides with reduced cytotoxicity. Disulfide-cyclized USCLs exhibited improved selectivity between Candida sp., Gram-positive strains and normal cells in contrast to their linear counterparts. Interactions between selected USCLs and membranes were studied by molecular dynamics simulations using a coarse-grained force field. Moreover, membrane permeabilization properties and kinetics were examined. Fluorescence and transmission electron microscopy revealed damage to Candida cell membrane and organelles. Concluding, USCLs are strong membrane disruptors and disulfide cyclization of polar head can have a beneficial effect on its in vitro selectivity between Candida sp. and normal human cells.
Collapse
Affiliation(s)
- Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (S.B.); (M.B.); (W.K.)
| | - Maciej Jaśkiewicz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (S.B.); (M.B.); (W.K.)
| | - Emilia Sikorska
- Department of Organic Chemistry, Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland;
| | - Sylwia Bartoszewska
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (S.B.); (M.B.); (W.K.)
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (S.B.); (M.B.); (W.K.)
| | - Małgorzata Kapusta
- Department of Plant Cytology and Embryology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland;
| | - Magdalena Narajczyk
- Laboratory of Electron Microscopy, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland;
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (S.B.); (M.B.); (W.K.)
| |
Collapse
|
19
|
Migoń D, Jaśkiewicz M, Neubauer D, Bauer M, Sikorska E, Kamysz E, Kamysz W. Alanine Scanning Studies of the Antimicrobial Peptide Aurein 1.2. Probiotics Antimicrob Proteins 2020; 11:1042-1054. [PMID: 30569430 PMCID: PMC6695355 DOI: 10.1007/s12602-018-9501-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Antimicrobial peptides (AMPs) are compounds widely distributed in nature that display activity against a broad spectrum of pathogens. Amphibian skin, as an organ rich in pharmacologically active peptides, appears to be an interesting source of novel AMPs. Aurein 1.2 (GLFDIIKKIAESF-NH2) is a short 13-residue antimicrobial peptide primarily isolated from the skin secretions of Australian bell frogs. In this study, the alanine scan of aurein 1.2 was performed to investigate the effect of each amino acid residue on its biological and physico-chemical properties. The biological studies included determination of minimum inhibitory concentration, activity against biofilm, and inhibitory effect on its formation. Moreover, the hemolytic activity as well as serum stability was determined. The hydrophobicity of peptides and their self-assembly were investigated using reversed-phase chromatography. In addition, their helicity was calculated from circular dichroism spectra. The results not only provided information on structure-activity relationship of aurein 1.2 but also gave insights into design of novel analogs of AMPs in the future.
Collapse
Affiliation(s)
- Dorian Migoń
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland. .,Polpharma Biologics, Gdańsk, Poland.
| | - Maciej Jaśkiewicz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | | | | | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| |
Collapse
|
20
|
Bellouin N, Quaas J, Gryspeerdt E, Kinne S, Stier P, Watson‐Parris D, Boucher O, Carslaw KS, Christensen M, Daniau A, Dufresne J, Feingold G, Fiedler S, Forster P, Gettelman A, Haywood JM, Lohmann U, Malavelle F, Mauritsen T, McCoy DT, Myhre G, Mülmenstädt J, Neubauer D, Possner A, Rugenstein M, Sato Y, Schulz M, Schwartz SE, Sourdeval O, Storelvmo T, Toll V, Winker D, Stevens B. Bounding Global Aerosol Radiative Forcing of Climate Change. Rev Geophys 2020; 58:e2019RG000660. [PMID: 32734279 PMCID: PMC7384191 DOI: 10.1029/2019rg000660] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 09/30/2019] [Accepted: 10/03/2019] [Indexed: 05/04/2023]
Abstract
Aerosols interact with radiation and clouds. Substantial progress made over the past 40 years in observing, understanding, and modeling these processes helped quantify the imbalance in the Earth's radiation budget caused by anthropogenic aerosols, called aerosol radiative forcing, but uncertainties remain large. This review provides a new range of aerosol radiative forcing over the industrial era based on multiple, traceable, and arguable lines of evidence, including modeling approaches, theoretical considerations, and observations. Improved understanding of aerosol absorption and the causes of trends in surface radiative fluxes constrain the forcing from aerosol-radiation interactions. A robust theoretical foundation and convincing evidence constrain the forcing caused by aerosol-driven increases in liquid cloud droplet number concentration. However, the influence of anthropogenic aerosols on cloud liquid water content and cloud fraction is less clear, and the influence on mixed-phase and ice clouds remains poorly constrained. Observed changes in surface temperature and radiative fluxes provide additional constraints. These multiple lines of evidence lead to a 68% confidence interval for the total aerosol effective radiative forcing of -1.6 to -0.6 W m-2, or -2.0 to -0.4 W m-2 with a 90% likelihood. Those intervals are of similar width to the last Intergovernmental Panel on Climate Change assessment but shifted toward more negative values. The uncertainty will narrow in the future by continuing to critically combine multiple lines of evidence, especially those addressing industrial-era changes in aerosol sources and aerosol effects on liquid cloud amount and on ice clouds.
Collapse
Affiliation(s)
- N. Bellouin
- Department of MeteorologyUniversity of ReadingReadingUK
| | - J. Quaas
- Institute for MeteorologyUniversität LeipzigLeipzigGermany
| | - E. Gryspeerdt
- Space and Atmospheric Physics GroupImperial College LondonLondonUK
| | - S. Kinne
- Max Planck Institute for MeteorologyHamburgGermany
| | - P. Stier
- Atmospheric, Oceanic and Planetary Physics, Department of PhysicsUniversity of OxfordOxfordUK
| | - D. Watson‐Parris
- Atmospheric, Oceanic and Planetary Physics, Department of PhysicsUniversity of OxfordOxfordUK
| | - O. Boucher
- Institut Pierre‐Simon Laplace, Sorbonne Université/CNRSParisFrance
| | - K. S. Carslaw
- School of Earth and EnvironmentUniversity of LeedsLeedsUK
| | - M. Christensen
- Atmospheric, Oceanic and Planetary Physics, Department of PhysicsUniversity of OxfordOxfordUK
| | - A.‐L. Daniau
- EPOC, UMR 5805, CNRS‐Université de BordeauxPessacFrance
| | - J.‐L. Dufresne
- Laboratoire de Météorologie Dynamique/IPSL, CNRS, Sorbonne Université, Ecole Normale Supérieure, PSL Research University, Ecole PolytechniqueParisFrance
| | - G. Feingold
- NOAA ESRL Chemical Sciences DivisionBoulderCOUSA
| | - S. Fiedler
- Max Planck Institute for MeteorologyHamburgGermany
- Now at Institut für Geophysik und MeteorologieUniversität zu KölnKölnGermany
| | - P. Forster
- Priestley International Centre for ClimateUniversity of LeedsLeedsUK
| | - A. Gettelman
- National Center for Atmospheric ResearchBoulderCOUSA
| | - J. M. Haywood
- CEMPSUniversity of ExeterExeterUK
- UK Met Office Hadley CentreExeterUK
| | - U. Lohmann
- Institute for Atmospheric and Climate ScienceETH ZürichZürichSwitzerland
| | | | - T. Mauritsen
- Department of MeteorologyStockholm UniversityStockholmSweden
| | - D. T. McCoy
- School of Earth and EnvironmentUniversity of LeedsLeedsUK
| | - G. Myhre
- Center for International Climate and Environmental Research‐Oslo (CICERO)OsloNorway
| | - J. Mülmenstädt
- Institute for MeteorologyUniversität LeipzigLeipzigGermany
| | - D. Neubauer
- Institute for Atmospheric and Climate ScienceETH ZürichZürichSwitzerland
| | - A. Possner
- Department of Global EcologyCarnegie Institution for ScienceStanfordCAUSA
- Now at Institute for Atmospheric and Environmental SciencesGoethe UniversityFrankfurtGermany
| | | | - Y. Sato
- Department of Applied Energy, Graduate School of Engineering, Nagoya UniversityNagoyaJapan
- Now at Faculty of Science, Department of Earth and Planetary SciencesHokkaido UniversitySapporoJapan
| | - M. Schulz
- Climate Modelling and Air Pollution Section, Research and Development DepartmentNorwegian Meteorological InstituteOsloNorway
| | - S. E. Schwartz
- Brookhaven National Laboratory Environmental and Climate Sciences DepartmentUptonNYUSA
| | - O. Sourdeval
- Institute for MeteorologyUniversität LeipzigLeipzigGermany
- Laboratoire d'Optique AtmosphériqueUniversité de LilleVilleneuve d'AscqFrance
| | - T. Storelvmo
- Department of GeosciencesUniversity of OsloOsloNorway
| | - V. Toll
- Department of MeteorologyUniversity of ReadingReadingUK
- Now at Institute of PhysicsUniversity of TartuTartuEstonia
| | - D. Winker
- NASA Langley Research CenterHamptonVAUSA
| | - B. Stevens
- Max Planck Institute for MeteorologyHamburgGermany
| |
Collapse
|
21
|
Kamysz E, Sikorska E, Jaśkiewicz M, Bauer M, Neubauer D, Bartoszewska S, Barańska-Rybak W, Kamysz W. Lipidated Analogs of the LL-37-Derived Peptide Fragment KR12-Structural Analysis, Surface-Active Properties and Antimicrobial Activity. Int J Mol Sci 2020; 21:E887. [PMID: 32019109 PMCID: PMC7036753 DOI: 10.3390/ijms21030887] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 01/24/2020] [Accepted: 01/28/2020] [Indexed: 02/06/2023] Open
Abstract
An increasing number of multidrug-resistant pathogens is a serious problem of modern medicine and new antibiotics are highly demanded. In this study, different n-alkyl acids (C2-C14) and aromatic acids (benzoic and trans-cinnamic) were conjugated to the N-terminus of KR12 amide. The effect of this modification on antimicrobial activity (ESKAPE bacteria and biofilm of Staphylococcus aureus) and cytotoxicity (human red blood cells and HaCaT cell line) was examined. The effect of lipophilic modifications on helicity was studied by CD spectroscopy, whereas peptide self-assembly was studied by surface tension measurements and NMR spectroscopy. As shown, conjugation of the KR12-NH2 peptide with C4-C14 fatty acid chains enhanced the antimicrobial activity with an optimum demonstrated by C8-KR12-NH2 (MIC 1-4 μg/mL against ESKAPE strains; MBEC of S. aureus 4-16 μg/mL). Correlation between antimicrobial activity and self-assembly behavior of C14-KR12-NH2 and C8-KR12-NH2 has shown that the former self-assembled into larger aggregated structures, which reduced its antimicrobial activity. In conclusion, N-terminal modification can enhance antimicrobial activity of KR12-NH2; however, at the same time, the cytotoxicity increases. It seems that the selectivity against pathogens over human cells can be achieved through conjugation of peptide N-terminus with appropriate n-alkyl fatty and aromatic acids.
Collapse
Affiliation(s)
- Elżbieta Kamysz
- Laboratory of Chemistry of Biological Macromolecules, Department of Molecular Biotechnology, Faculty of Chemistry, University of Gdańsk, 80-308 Gdańsk, Poland
| | - Emilia Sikorska
- Laboratory of Structural Studies of Biopolymers, Department of Organic Chemistry, Faculty of Chemistry, University of Gdańsk, 80-308 Gdańsk, Poland;
| | - Maciej Jaśkiewicz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (M.B.); (D.N.); (S.B.); (W.K.)
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (M.B.); (D.N.); (S.B.); (W.K.)
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (M.B.); (D.N.); (S.B.); (W.K.)
| | - Sylwia Bartoszewska
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (M.B.); (D.N.); (S.B.); (W.K.)
| | - Wioletta Barańska-Rybak
- Department of Dermatology, Venereology and Allergology, Faculty of Medicine, Medical University of Gdańsk, 80-214 Gdańsk, Poland;
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland; (M.J.); (M.B.); (D.N.); (S.B.); (W.K.)
| |
Collapse
|
22
|
Stachurski O, Neubauer D, Małuch I, Wyrzykowski D, Bauer M, Bartoszewska S, Kamysz W, Sikorska E. Effect of self-assembly on antimicrobial activity of double-chain short cationic lipopeptides. Bioorg Med Chem 2019; 27:115129. [PMID: 31668583 DOI: 10.1016/j.bmc.2019.115129] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 09/10/2019] [Accepted: 09/18/2019] [Indexed: 01/03/2023]
Abstract
Short cationic antimicrobial lipopeptides with surfactant-like structure are promising antibiotic candidates that preferentially target microbial membranes. Therefore, we focused our study on double-chain lipopeptides, (C10-16)2Dab-KKK-NH2 and (C10-16)2Dap-KKK-NH2, where Dab and Dap are 2,4-diaminobutyric and 2,3-diaminopropionic acids, respectively. We tried to answer a question how the self-assembly behaviour affects biological activities of the tested compounds. The subject compounds were synthesized by solid-phase method and screened for their antimicrobial and haemolytic activities. Cytotoxicity tests on human keratinocytes were carried out for the most promising lipopeptides. Self-assembly properties were evaluated by both experimental and theoretical methods. Interactions with membrane models were examined using the ITC and FTIR techniques. All the lipopeptides studied showed the tendency to self-assembly in solution, and this behaviour was affected by the length of the hydrocarbon chains. Acyl chain elongation supported the formation of the bilayer structure and deprived the lipopeptides of antimicrobial activity. A multi-step mechanism of interaction with a negatively charged membrane was observed for the short-chain lipopeptides, indicating other processes accompanying the binding process. Short-chain lipopeptides were able to penetrate into the liposome's interior and/or cause the rupture of the liposome, this being compatible with their high antimicrobial activity.
Collapse
Affiliation(s)
- Oktawian Stachurski
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Damian Neubauer
- Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| | - Izabela Małuch
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Dariusz Wyrzykowski
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Marta Bauer
- Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| | - Sylwia Bartoszewska
- Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| | - Wojciech Kamysz
- Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| | - Emilia Sikorska
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland.
| |
Collapse
|
23
|
Paduszynska MA, Maciejewska M, Neubauer D, Golacki K, Szymukowicz M, Bauer M, Kamysz W. Influence of Short Cationic Lipopeptides with Fatty Acids of Different Chain Lengths on Bacterial Biofilms Formed on Polystyrene and Hydrogel Surfaces. Pharmaceutics 2019; 11:E506. [PMID: 31581500 PMCID: PMC6835763 DOI: 10.3390/pharmaceutics11100506] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/21/2019] [Accepted: 09/23/2019] [Indexed: 01/02/2023] Open
Abstract
Nowadays, biomaterials are applied in many different branches of medicine. They significantly improve the patients' comfort and quality of life, but also constitute a significant risk factor for biofilm-associated infections. Currently, intensive research on the development of novel materials resistant to microbial colonization as well as new compounds that are active against biofilms is being carried out. Within this research, antimicrobial peptides (AMPs) and their analogues are being intensively investigated due to their promising antimicrobial activities. The main goal of this study was to synthesize and evaluate the antimicrobial efficacy of short cationic lipopeptides that were designed to imitate the features of AMPs responsible for antimicrobial activities: positive net charge and amphipacity. The positive charge of the molecules results from the presence of basic amino acid residues: arginine and lysine. Amphipacity is provided by the introduction of decanoic, dodecanoic, tetradecanoic, and hexadecanoic acid chains to the molecules. Lipopeptides (C16-KR-NH2, C16-KKK-NH2, C16-KKC-NH2, C16-KGK-NH2, C14-KR-NH2, C14-KKC-NH2, C12-KR-NH2, C12-KKC-NH2, and (C10)2-KKKK-NH2) were synthesized using a novel solid-phase temperature-assisted methodology. The minimum inhibitory concentrations (MICs), minimum biofilm eradication concentrations (MBECs), and minimum biofilm formation inhibitory concentrations (MBFICs) were determined for the following bacterial strains: Staphylococcus aureus ATCC 25923, Staphylococcus epidermidis ATCC 14990, Enterococcus faecalis ATCC 29212, Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 9027, and Proteus mirabilis PCM 543. The biofilms were cultured on two types of surfaces: polystyrene plates (PS) and contact lenses (CL). The lipopeptides exhibited the ability to inhibit the growth of bacteria in a liquid medium as well as on the PS and CL. The compounds also eliminated the bacterial biofilm from the surface of both materials. In general, the activity against gram-positive bacteria was stronger in comparison to that against gram-negative strains. There were certain discrepancies between the activity of compounds against the biofilm cultured on PS and CL. This was especially noticeable for staphylococci-the lipopeptides presented much higher activity against biofilm formed on the PS surface. It is worth noting that the obtained MBEC values for lipopeptides were usually only a few times higher than the MICs. The results of the performed experiments suggest that further studies on lipopeptides and their potential application in the treatment and prophylaxis of biofilm-associated infections should be conducted.
Collapse
Affiliation(s)
- Malgorzata Anna Paduszynska
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, 80-416 Gdansk, Poland.
| | - Magdalena Maciejewska
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, 80-416 Gdansk, Poland.
- Pharmaceutical Laboratory Avena Sp. z.o.o., 86-031 Osielsko, Poland.
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, 80-416 Gdansk, Poland.
| | - Krzysztof Golacki
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, 80-416 Gdansk, Poland.
| | - Magdalena Szymukowicz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, 80-416 Gdansk, Poland.
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, 80-416 Gdansk, Poland.
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, 80-416 Gdansk, Poland.
| |
Collapse
|
24
|
Jaśkiewicz M, Neubauer D, Kazor K, Bartoszewska S, Kamysz W. Antimicrobial Activity of Selected Antimicrobial Peptides Against Planktonic Culture and Biofilm of Acinetobacter baumannii. Probiotics Antimicrob Proteins 2019; 11:317-324. [PMID: 30043322 PMCID: PMC6449538 DOI: 10.1007/s12602-018-9444-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Acinetobacter baumannii is one of the most challenging pathogens, on account of its predisposition to develop resistance leading to severe, difficult-to-treat infections. As these bacteria are more usually isolated from nosocomial infections, the new therapeutic options are demanded. Antimicrobial peptides (AMPs) are compounds likely to find application in the treatment of A. baumannii. These compounds exhibit a wide spectrum of antimicrobial activity and were found to be effective against biofilm. In this study, eight AMPs, namely aurein 1.2, CAMEL, citropin 1.1., LL-37, omiganan, r-omiganan, pexiganan, and temporin A, were tested for their antimicrobial activity. A reference strain of A. baumannii ATCC 19606 was used. Antimicrobial assays included determination of the minimum inhibitory concentration and the minimum biofilm eradication concentration. Considering the fact that the majority of A. baumannii infections are associated with mechanical ventilation and the use of indwelling devices, the activity against biofilm was assessed on both a polystyrene surface and tracheal tube fragments. In addition, cytotoxicity (HaCaT) was determined and in vitro selectivity index was calculated.
Collapse
Affiliation(s)
- Maciej Jaśkiewicz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, Gdansk, Poland.
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, Gdansk, Poland
| | - Kamil Kazor
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, Gdansk, Poland
| | - Sylwia Bartoszewska
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, Gdansk, Poland
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, Gdansk, Poland
| |
Collapse
|
25
|
Morroni G, Simonetti O, Brenciani A, Brescini L, Kamysz W, Kamysz E, Neubauer D, Caffarini M, Orciani M, Giovanetti E, Offidani A, Giacometti A, Cirioni O. In vitro activity of Protegrin-1, alone and in combination with clinically useful antibiotics, against Acinetobacter baumannii strains isolated from surgical wounds. Med Microbiol Immunol 2019; 208:877-883. [PMID: 31214759 DOI: 10.1007/s00430-019-00624-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 06/07/2019] [Indexed: 12/01/2022]
Abstract
In the past few years the increasing incidence of hospital infections with Acinetobacter baumannii, especially in immunocompromised patients, and its proneness to develop multidrug resistance have been raising considerable concern. This study examines the antimicrobial and antibiofilm activity of protegrin 1 (PG-1), an antimicrobial peptide from porcine leukocytes, against A. baumannii strains isolated from surgical wounds. PG-1 was tested both alone and combined with the antibiotics commonly used in clinical settings. Its antimicrobial activity was evaluated by determination of minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC), checkerboard assays, and time-kill experiments. Its effects on biofilm inhibition/eradication were tested with crystal violet staining. The strains were grown in subinhibitory or increasing PG-1 concentrations to test the development of resistance. Mammalian cell toxicity was tested by XTT assays. PG-1 MICs and MBCs ranged from 2 to 8 µg/ml. PG-1 was most active and demonstrated a synergistic interaction with colistin, a last resort antibiotic. Interestingly, antagonism was never observed. In time-kill experiments, incubation with 2 × MIC for 30 min suppressed all viable cells. PG-1 did not select resistant strains and showed a limited effect on cell viability, but it did exert a strong activity against multidrug-resistant A. baumannii. In contrast, in our experimental conditions it had no effect on biofilm inhibition/eradication. PG-1 thus seems to be a promising antimicrobial agent against multidrug-resistant Gram-negative infections.
Collapse
Affiliation(s)
- Gianluca Morroni
- Infectious Diseases Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Oriana Simonetti
- Dermatological Clinic, Polytechnic University of Marche, Ancona, Italy
| | - Andrea Brenciani
- Microbiology Unit, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy.
| | - Lucia Brescini
- Infectious Diseases Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Wojciech Kamysz
- Faculty of Pharmacy, Medical University of Gdansk, Gdańsk, Poland
| | | | - Damian Neubauer
- Faculty of Pharmacy, Medical University of Gdansk, Gdańsk, Poland
| | - Miriam Caffarini
- Histology, Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Monia Orciani
- Histology, Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Eleonora Giovanetti
- Microbiology Unit, Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy
| | | | - Andrea Giacometti
- Infectious Diseases Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Oscar Cirioni
- Infectious Diseases Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| |
Collapse
|
26
|
Ciandrini E, Morroni G, Arzeni D, Kamysz W, Neubauer D, Kamysz E, Cirioni O, Brescini L, Baffone W, Campana R. Antimicrobial Activity of Different Antimicrobial Peptides (AMPs) Against Clinical Methicillin-resistant Staphylococcus aureus (MRSA). Curr Top Med Chem 2019; 18:2116-2126. [PMID: 30345920 DOI: 10.2174/1568026618666181022140348] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 09/21/2018] [Accepted: 10/25/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND Antimicrobial research is being focused to look for more effective therapeutics against antibiotic-resistant infections caused by methicillin-resistant Staphylococcus aureus (MRSA). In this direction, antimicrobial peptides (AMP) appear as promising tool. OBJECTIVES This study evaluated the antimicrobial activity of different AMPs (Citropin 1.1, Temporin A, Pexiganan, CA(1-7)M(2-9)NH2, Pal-KGK-NH2, Pal-KKKK-NH2, LL-37) against human MRSA clinical isolates. METHODS The Minimum Inhibitory Concentration (MIC) was assessed for each AMP; then, the most active ones (Citropin 1.1, Temporin A, CA(1-7)M(2-9)NH2 and Pal-KGK-NH2) were tested against selected MRSA strains by time-kill studies. RESULTS The lowest MIC value was observed for Pal-KGK-NH2 (1 µg/ml), followed by Temporin A (4- 16 µg/ml), CA(1-7)M(2-9)NH2 (8-16 µg/ml) and Citropin 1.1 (16-64 µg/ml), while higher MICs were evidenced for LL-37, Pexiganan and Pal-KKKK-NH2 (> 128 µg/ml). In time-kill experiments, Citropin 1.1 and CA(1-7)M(2-9)NH2 showed a relatively high percentage of growth inhibition (>30 %) for all the tested MRSA clinical isolates, with a dose-dependent activity resulting in the highest percentage of bacterial growth inhibition (89.39%) at 2MIC concentration. CONCLUSION Overall, our data demonstrated the potential of some AMPs against MRSA isolates, such as Citropin 1.1 and CA(1-7)M(2-9)NH2, that represents a promising area of development for different clinical applications.
Collapse
Affiliation(s)
- Eleonora Ciandrini
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Gianluca Morroni
- Infectious Disease Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Daniela Arzeni
- Infectious Disease Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Wojciech Kamysz
- Faculty of Pharmacy, Department of Inorganic Chemistry, Medical University of Gdansk, Gdansk, Poland
| | - Damian Neubauer
- Faculty of Pharmacy, Department of Inorganic Chemistry, Medical University of Gdansk, Gdansk, Poland
| | - Elzbieta Kamysz
- Faculty of Chemistry, Department of Molecular Biotechnology, University of Gdansk, Gdansk, Poland
| | - Oscar Cirioni
- Infectious Disease Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Lucia Brescini
- Infectious Disease Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Wally Baffone
- Department of Biomolecular Sciences, Division of Toxicological, Hygiene and Environmental Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Raffaella Campana
- Department of Biomolecular Sciences, Division of Toxicological, Hygiene and Environmental Sciences, University of Urbino Carlo Bo, Urbino, Italy
| |
Collapse
|
27
|
Kemmler R, Hübner R, Löhle A, Neubauer D, Voloshenko I, Schoop LM, Dressel M, Pronin AV. Free-carrier dynamics in Au 2Pb probed by optical conductivity measurements. J Phys Condens Matter 2018; 30:485403. [PMID: 30418951 DOI: 10.1088/1361-648x/aae7b1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We measured the optical reflectivity of the Dirac material Au2Pb in a broad frequency range (30-48 000 cm-1) for temperatures between 9 and 300 K. The optical conductivity, computed from the reflectivity, is dominated by free-carrier contributions from topologically trivial bulk bands at all temperatures. The temperature-independent total plasma frequency of these carriers is [Formula: see text] eV. Overall, optical response of Au2Pb is typically metallic with no signs of localization and bad-metal behavior.
Collapse
Affiliation(s)
- R Kemmler
- 1. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany
| | | | | | | | | | | | | | | |
Collapse
|
28
|
Sikorska E, Stachurski O, Neubauer D, Małuch I, Wyrzykowski D, Bauer M, Brzozowski K, Kamysz W. Short arginine-rich lipopeptides: From self-assembly to antimicrobial activity. Biochim Biophys Acta Biomembr 2018; 1860:2242-2251. [PMID: 30409520 DOI: 10.1016/j.bbamem.2018.09.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Revised: 08/20/2018] [Accepted: 09/05/2018] [Indexed: 11/27/2022]
Abstract
In this paper, we examine antimicrobial and cytotoxic activities, self-assembly and interactions with anionic and zwitterionic membranes of short arginine-rich lipopeptides: C16-RRRR-NH2, C14-RRRR-NH2, C12-RRRR-NH2, and C16-PRRR-NH2. They show a tendency to self-assembly into micelles, but it is not required for antimicrobial activity. The membrane binding of the lipopeptides can be accompanied by other factors such as: peptide aggregation, pore formation or micellization of phospholipid bilayer. The shortening of the acyl chain results in compounds with a lower haemolytic activity and a slightly improved antimicrobial activity against Gram-positive bacteria, what indicates enhanced cell specificity. Results of coarse-grained molecular dynamics simulations indicate different organization of membrane lipids upon binding of arginine-based lipopeptides and the previously studied lysine-based ones.
Collapse
Affiliation(s)
- Emilia Sikorska
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland.
| | - Oktawian Stachurski
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Damian Neubauer
- Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| | - Izabela Małuch
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Dariusz Wyrzykowski
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Marta Bauer
- Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| | - Krzysztof Brzozowski
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Wojciech Kamysz
- Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland
| |
Collapse
|
29
|
Nakonieczna J, Wolnikowska K, Ogonowska P, Neubauer D, Bernat A, Kamysz W. Rose Bengal-Mediated Photoinactivation of Multidrug Resistant Pseudomonas aeruginosa Is Enhanced in the Presence of Antimicrobial Peptides. Front Microbiol 2018; 9:1949. [PMID: 30177928 PMCID: PMC6110182 DOI: 10.3389/fmicb.2018.01949] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Accepted: 08/02/2018] [Indexed: 12/24/2022] Open
Abstract
Due to the overuse of antibiotics in medicine and food production, and their targeted mechanism of action, an increasing rate in spreading of antibiotic resistance genes has been noticed. This results in inefficient therapy outcomes and higher mortality all over the world. Pseudomonas aeruginosa (carbapenem-resistant) is considered one of the top three critical species according to the World Health Organization’s priority pathogens list. This means that new drugs and/or treatments are needed to tackle infections caused by this bacterium. In this context search for new/alternative approaches that would overcome resistance to classical antimicrobials is of prime importance. The use of antimicrobial photodynamic inactivation (aPDI) and antimicrobial peptides (AMPs) is an efficient strategy to treat localized infections caused by multidrug-resistant P. aeruginosa. In this study, we have treated P. aeruginosa cells photodynamically in the presence and in the absence of AMP (CAMEL or pexiganan). The conditions for aPDI were as follows: rose bengal (RB) as a photosensitizing agent at 1–10 μM concentration, and subsequent irradiation with 514 nm-LED at 23 mW/cm2 irradiance. The analysis of cell number after the treatment has shown that the combined action of RB-mediated aPDI and cationic AMPs reduced the number of viable cells below the limit of detection (<1log10 CFU/ml). This was in contrast to no reduction or partial reduction after aPDI or AMP applied separately. Students t-test was applied to test the statistical significance of the results. Noteworthy, our treatment proved to be effective against all 35 clinical isolates of P. aeruginosa tested within this study, including those characterized as multiresistant. Moreover, we demonstrated that such treatment is safe and does not violate the growth dynamics of human keratinocytes (77.3–97.64% survival depending on the concentration of the studied compounds or their mixtures).
Collapse
Affiliation(s)
- Joanna Nakonieczna
- Laboratory of Molecular Diagnostics, Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdańsk and Medical University of Gdańsk, Gdańsk, Poland
| | - Katarzyna Wolnikowska
- Laboratory of Molecular Diagnostics, Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdańsk and Medical University of Gdańsk, Gdańsk, Poland
| | - Patrycja Ogonowska
- Laboratory of Molecular Diagnostics, Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdańsk and Medical University of Gdańsk, Gdańsk, Poland
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Gdańsk, Poland
| | - Agnieszka Bernat
- Laboratory of Molecular Diagnostics, Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdańsk and Medical University of Gdańsk, Gdańsk, Poland.,Laboratory of Experimental Embryology, Institute of Genetics and Animal Breeding, Polish Academy of Sciences, Warsaw, Poland
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Gdańsk, Poland
| |
Collapse
|
30
|
Sikora K, Jaśkiewicz M, Neubauer D, Bauer M, Bartoszewska S, Barańska-Rybak W, Kamysz W. Counter-ion effect on antistaphylococcal activity and cytotoxicity of selected antimicrobial peptides. Amino Acids 2018; 50:609-619. [PMID: 29307075 PMCID: PMC5917001 DOI: 10.1007/s00726-017-2536-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Accepted: 12/28/2017] [Indexed: 12/13/2022]
Abstract
In view of an appreciable increase in resistance of Staphylococcus aureus to the conventional antibiotics, it is desired to develop new effective drugs. Antimicrobial peptides (AMPs) seem to be attractive candidates. In general, AMPs samples used for in vitro studies consist of a peptide, counter-ion, and water. The presence of the counter-ion could be significant as it affects peptide secondary structure and biological activity. The purpose of this study was to estimate the impact of counter-ion on antistaphylococcal activity of selected AMPs (CAMEL, citropin 1.1, LL-37, pexiganan, temporin A). To do this, three kinds of salts were prepared, namely, acetates, hydrochlorides, and trifluoroacetates. In addition, the hemolytic activity against human red blood cells (hRBCs) and cytotoxicity (HaCaT) were determined. The results indicate that there is a substantial difference between different salts, but the pattern is not consistent for the peptides. In general, the antistaphylococcal activity decreased in the order: CAMEL > temporin A > pexiganan > citropin 1.1 ≫ LL-37. The highest selectivity indexes were determined for CAMEL hydrochloride, pexiganan acetate, and temporin A trifluoroacetate. This study shows how important is to take into account the kind of counter-ions when designing novel peptide-based antimicrobials.
Collapse
Affiliation(s)
- Karol Sikora
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland.
| | - Maciej Jaśkiewicz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Sylwia Bartoszewska
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Wioletta Barańska-Rybak
- Chair and Clinic of Dermatology, Venereology and Allergology, Medical University of Gdańsk, Gdańsk, Poland
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| |
Collapse
|
31
|
Abstract
Antimicrobial peptides are promising candidates for anti-infective pharmaceuticals. Unfortunately, because of their low proteolytic and chemical stability, their usage is generally narrowed down to topical formulations. Until now, numerous approaches to increase peptide stability have been proposed. One of them, peptide hydrocarbon stapling, a modification based on stabilizing peptide secondary structure with a side-chain covalent hydrocarbon bridge, have been successfully applied to many peptides. Moreover, constraining secondary structure of peptides have also been proven to increase their biological activity. This review article describes studies on hydrocarbon stapled antimicrobial peptides with respect to improved drug-like properties.
Collapse
Affiliation(s)
- Dorian Migoń
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland.
- Polpharma Biologics, Gdańsk, Poland.
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, Al. Gen. J. Hallera 107, 80-416, Gdańsk, Poland
| |
Collapse
|
32
|
Jaśkiewicz M, Neubauer D, Kamysz W. Comparative Study on Antistaphylococcal Activity of Lipopeptides in Various Culture Media. Antibiotics (Basel) 2017; 6:antibiotics6030015. [PMID: 28767074 PMCID: PMC5617979 DOI: 10.3390/antibiotics6030015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 07/17/2017] [Accepted: 07/31/2017] [Indexed: 01/01/2023] Open
Abstract
Staphylococcus aureus bacteria are one of the leading microorganisms responsible for nosocomial infections as well as being the primary causative pathogen of skin and wound infections. Currently, the therapy of staphylococcal diseases faces many difficulties, due to a variety of mechanisms of resistance and virulence factors. Moreover, a number of infections caused by S. aureus are connected with biofilm formation that impairs effectiveness of the therapy. Short cationic lipopeptides that are designed on the basis of the structure of antimicrobial peptides are likely to provide a promising alternative to conventional antibiotics. Many research groups have proved a high antistaphylococcal potential of lipopeptides, however, the use of different protocols for determination of antimicrobial activity may be the reason for inconsistency of the results. The aim of this study was to learn how the use of various bacteriological media as well as solvents may affect activity of lipopeptides and their cyclic analogs. Obtained results showed a great impact of these variables. For example, cyclic analogs were more effective when dissolved in an aqueous solution of acetic acid and bovine serum albumin (BSA). The greater activity against planktonic cultures was found in brain-heart infusion broth (BHI) and tryptic-soy broth (TSB), while the antibiofilm activity was higher in the Mueller-Hinton medium.
Collapse
Affiliation(s)
- Maciej Jaśkiewicz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland.
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland.
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdańsk, 80-416 Gdańsk, Poland.
| |
Collapse
|
33
|
Maciejewska M, Bauer M, Neubauer D, Kamysz W, Dawgul M. Influence of Amphibian Antimicrobial Peptides and Short Lipopeptides on Bacterial Biofilms Formed on Contact Lenses. Materials (Basel) 2016; 9:ma9110873. [PMID: 28773992 PMCID: PMC5457276 DOI: 10.3390/ma9110873] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 09/22/2016] [Accepted: 10/20/2016] [Indexed: 12/28/2022]
Abstract
The widespread use of contact lenses is associated with several complications, including ocular biofilm-related infections. They are very difficult to manage with standard antimicrobial therapies, because bacterial growth in a biofilm is associated with an increased antibiotic resistance. The principal aim of this study was to evaluate the efficacy of antimicrobial peptides (AMPs) in eradication of bacterial biofilms formed on commercially available contact lenses. AMPs were synthesized according to Fmoc/tBu chemistry using the solid-phase method. Minimum inhibitory concentration (MIC) and minimum biofilm eradication concentration (MBEC) of the compounds were determined. Anti-biofilm activity of the antimicrobial peptides determined at different temperatures (25 °C and 37 °C) were compared with the effectiveness of commercially available contact lens solutions. All of the tested compounds exhibited stronger anti-biofilm properties as compared to those of the tested lens solutions. The strongest activity of AMPs was noticed against Gram-positive strains at a temperature of 25 °C. Conclusions: The results of our experiments encourage us toward further studies on AMPs and their potential application in the prophylaxis of contact lens-related eye infections.
Collapse
Affiliation(s)
- Magdalena Maciejewska
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, Gdansk 80-416, Poland.
- Pharmaceutical Laboratory, Avena SJ, Osielsko 86-031, Poland.
| | - Marta Bauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, Gdansk 80-416, Poland.
| | - Damian Neubauer
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, Gdansk 80-416, Poland.
| | - Wojciech Kamysz
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, Gdansk 80-416, Poland.
| | - Malgorzata Dawgul
- Department of Inorganic Chemistry, Faculty of Pharmacy, Medical University of Gdansk, Gdansk 80-416, Poland.
| |
Collapse
|
34
|
Alves D, Magalhães A, Grzywacz D, Neubauer D, Kamysz W, Pereira MO. Co-immobilization of Palm and DNase I for the development of an effective anti-infective coating for catheter surfaces. Acta Biomater 2016; 44:313-22. [PMID: 27514277 DOI: 10.1016/j.actbio.2016.08.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 06/23/2016] [Accepted: 08/07/2016] [Indexed: 12/15/2022]
Abstract
UNLABELLED Biomaterial-associated infections, in particular, catheter-associated infections (CAI) are a major problem in clinical practice due to their ability to resist antimicrobial treatment and the host immune system. This study aimed to co-immobilize the antimicrobial lipopeptide Palm and the enzyme DNase I to introduce both antimicrobial and anti-adhesive functionalities to polydimethylsiloxane (PDMS) material, using dopamine chemistry. Surface characterization confirmed the immobilization of both compounds and no leaching of Palm from the surfaces for up to 5days. Co-immobilization of both agents resulted in a bifunctional coating with excellent surface antimicrobial and anti-biofilm properties against both Staphylococcus aureus and Pseudomonas aeruginosa. The modified surfaces demonstrated superior biocompatibility. To better discriminate co-adhesion of both species on modified surfaces, PNA FISH (Fluorescence in situ hybridization using peptide nucleic acid probes) was employed, and results showed that P. aeruginosa was the dominant organism, with S. aureus adhering afterwards on P. aeruginosa agglomerates. Furthermore, Palm immobilization exhibited no propensity to develop bacterial resistance, as opposite to the immobilization of an antibiotic. The overall results highlighted that co-immobilization of Palm and DNase I holds great potential to be applied in the development of catheters. STATEMENT OF SIGNIFICANCE Catheter-associated infections (CAI) are the most common hospital-acquired infections worldwide. Several coating strategies have been proposed to fight these infections but most of them present some important limitations, including the emergence of resistant bacteria and toxicity concerns. The present work describes a two-step polydopamine-based surface modification strategy to successfully co-immobilize an antimicrobial peptide (Palm) and an enzyme targeting an important component of biofilm matrix (DNase I). This immobilization approach imparted polydimethylsiloxane surfaces with both anti-adhesive and antimicrobial properties against the adhesion of relevant bacteria as single and dual-species, with excellent stability and biocompatible and anti-biofilm properties, holding, therefore, great potential in the development of catheters able to prevent CAI.
Collapse
Affiliation(s)
- Diana Alves
- CEB - Centre of Biological Engineering, LIBRO - Laboratório de Investigação em Biofilmes Rosário Oliveira, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
| | - Andreia Magalhães
- CEB - Centre of Biological Engineering, LIBRO - Laboratório de Investigação em Biofilmes Rosário Oliveira, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | | | - Damian Neubauer
- Faculty of Pharmacy, Medical University of Gdansk, 80-416 Gdansk, Poland
| | - Wojciech Kamysz
- Peptideweb.com, 80-298 Gdansk, Poland; Faculty of Pharmacy, Medical University of Gdansk, 80-416 Gdansk, Poland
| | - Maria Olívia Pereira
- CEB - Centre of Biological Engineering, LIBRO - Laboratório de Investigação em Biofilmes Rosário Oliveira, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| |
Collapse
|
35
|
Dawgul M, Baranska-Rybak W, Piechowicz L, Bauer M, Neubauer D, Nowicki R, Kamysz W. The Antistaphylococcal Activity of Citropin 1.1 and Temporin A against Planktonic Cells and Biofilms Formed by Isolates from Patients with Atopic Dermatitis: An Assessment of Their Potential to Induce Microbial Resistance Compared to Conventional Antimicrobials. Pharmaceuticals (Basel) 2016; 9:E30. [PMID: 27231918 PMCID: PMC4932548 DOI: 10.3390/ph9020030] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 05/16/2016] [Accepted: 05/19/2016] [Indexed: 01/22/2023] Open
Abstract
Staphylococcus aureus (SA) colonizes the vast majority of patients with atopic dermatitis (AD). Its resistance to antibiotics and ability to form biofilms are the main origins of therapeutic complications. Endogenous antimicrobial peptides (AMPs) exhibit strong activity against SA, including antibiotic resistant strains as well as bacteria existing in biofilm form. The purpose of the present work was to determine the antistaphylococcal activity of two amphibian peptides against SA isolated from patients with AD. The AMPs demonstrated permanent activity towards strains exposed to sublethal concentrations of the compounds and significantly stronger antibiofilm activity in comparison to that of conventional antimicrobials. The results suggest the potential application of amphibian AMPs as promising antistaphylococcal agents for the management of skin infections.
Collapse
Affiliation(s)
- Malgorzata Dawgul
- Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland.
| | | | - Lidia Piechowicz
- Faculty of Medicine, Medical University of Gdansk, Debinki 7, 80-211 Gdansk, Poland.
| | - Marta Bauer
- Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland.
| | - Damian Neubauer
- Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland.
| | - Roman Nowicki
- Faculty of Medicine, Medical University of Gdansk, Debinki 7, 80-211 Gdansk, Poland.
| | - Wojciech Kamysz
- Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416 Gdansk, Poland.
| |
Collapse
|
36
|
Zapf S, Stingl C, Post KW, Maiwald J, Bach N, Pietsch I, Neubauer D, Löhle A, Clauss C, Jiang S, Jeevan HS, Basov DN, Gegenwart P, Dressel M. Persistent Detwinning of Iron-Pnictide EuFe_{2}As_{2} Crystals by Small External Magnetic Fields. Phys Rev Lett 2014; 113:227001. [PMID: 25494081 DOI: 10.1103/physrevlett.113.227001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Indexed: 06/04/2023]
Abstract
Our comprehensive study on EuFe_{2}As_{2} reveals a dramatic reduction of magnetic detwinning fields compared to other AFe_{2}As_{2} (A=Ba, Sr, Ca) iron pnictides by indirect magnetoelastic coupling of the Eu^{2+} ions. We find that only ∼0.1 T are sufficient for persistent detwinning below the local Eu^{2+} ordering; above T_{Eu}=19 K, higher fields are necessary. Even after the field is switched off, a significant imbalance of twin domains remains constant up to the structural and electronic phase transition (190 K). This persistent detwinning provides the unique possibility to study the low temperature electronic in-plane anisotropy of iron pnictides without applying any symmetry-breaking external force.
Collapse
Affiliation(s)
- S Zapf
- 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - C Stingl
- I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
| | - K W Post
- Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
| | - J Maiwald
- I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany and Experimentalphysik VI, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
| | - N Bach
- I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
| | - I Pietsch
- I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
| | - D Neubauer
- 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - A Löhle
- 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - C Clauss
- 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - S Jiang
- 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - H S Jeevan
- I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany and Department of Physics, PESITM, Sagar Road, 577204 Shimoga, India
| | - D N Basov
- Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
| | - P Gegenwart
- I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany and Experimentalphysik VI, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
| | - M Dressel
- 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| |
Collapse
|
37
|
Abstract
Ein neues einstufiges Verfahren zur Darstellung von Cyclopentadienyl-mangan-tricarbonyl wird beschrieben. Mangan (II)-salze, Cyclopentadien und Kohlenoxyd werden unter Druck in Gegenwart von Aminen und Reduktionsmitteln in Dimethylformamid als Lösungsmittel umgesetzt. Ohne Zusatz von Cyclopentadien und Amin entsteht auf relativ einfache Weise Mangancarbonyl.
Collapse
Affiliation(s)
- J. F. Cordes
- Aus dem Hauptlaboratorium der Badischen Anilin- und Soda-Fabrik AG, Ludwigshafen am Rhein
| | - D. Neubauer
- Aus dem Hauptlaboratorium der Badischen Anilin- und Soda-Fabrik AG, Ludwigshafen am Rhein
| |
Collapse
|
38
|
Schmidt H, Michel C, Kielgast F, Neubauer D, Thompson K, Frick M, Mizaikoff B, Dietl P, Wittekindt OH. Einfluss der ENaC-Aktivierung auf die Volumenresorption in Lungenepithelien. Pneumologie 2014. [DOI: 10.1055/s-0034-1375911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
39
|
Shen X, Brengman J, Neubauer D, Engel A. P.12.5 Subunit specific effects of the invariant AChR Cys-loop Aspartate residues on gating and AChR expression. Neuromuscul Disord 2013. [DOI: 10.1016/j.nmd.2013.06.587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
40
|
Michel C, Neubauer D, Frick M, Mizaikoff B, Dietl P, Wittekindt OH. Anpassung des respiratorischen Epithels an eine apikale Volumenerhöhung. Pneumologie 2013. [DOI: 10.1055/s-0033-1345054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
41
|
Neubauer D, Frick M, Kiss J, Dietl P, Mizaikoff B, Wittekindt OH. Deuteriumoxid-Verdünnungsmethode zur Messung des transepithelialen Wassertransports. Pneumologie 2012. [DOI: 10.1055/s-0032-1309183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
42
|
Hrastovec A, Hostnik T, Neubauer D. Benign convulsions in newborns and infants: occurrence, clinical course and prognosis. Eur J Paediatr Neurol 2012; 16:64-73. [PMID: 22116015 DOI: 10.1016/j.ejpn.2011.10.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Revised: 10/10/2011] [Accepted: 10/30/2011] [Indexed: 11/30/2022]
Abstract
BACKGROUND During early development severe epilepsies may appear, some with well established occurrence. Benign non-epileptic and epileptic paroxysmal syndromes with excellent prognosis occur in the same period. There are no exact data on their occurrence. AIM We have reviewed medical histories of children with benign non-epileptic or benign epileptic events: benign myoclonus of early infancy, benign neonatal sleep myoclonus, benign sleep myoclonus in infancy, benign partial epilepsy in infancy (BPEI) and benign infantile familial convulsions (BIFC) were established. The occurrence, clinical characteristics and prognosis of these syndromes were evaluated. METHODS Inclusion criteria were met in 31 children. Research included retrospective analysis of clinical characteristics, laboratory values, neuroimaging and neurophysiological assessments, followed by evaluation of psychosocial development with the use of the Strengths and Difficulties Questionnaire (SDQ), fulfilled by parents. RESULTS In our group the incidence of benign non-epileptic convulsions was 6.69 per 10 000 live births and the incidence of benign epileptic convulsions was 1.35 per 10 000. Male/female ratio in the group of children with non-epileptic events was 2.1:1. Among non-epileptic group 5 out of 23 children and among epileptic group 3 out of 8 children had minimal, mild or moderate abnormalities at neurological assessment at the time of the first clinical examination. Nonspecific changes in laboratory values were seen in 6 out of 23 in the non-epileptic and in 1 out of 8 children in the epileptic group. Neurophysiological assessments showed subtle changes in 4/23 in the non-epileptic and 6/8 in the epileptic group. Neuroimaging was not optimal in 5/23 with non-epileptic and 3/8 with epileptic events. Analysis of SDQ did not show significant deviations in psyhosocial development. Statistically significant deviation was observed only in relations with peers (p = 0.009). CONCLUSIONS Benign neonatal and infantile convulsions are more frequent than severe epilepsies of the same age period. Results show higher proportion of males with benign non-epileptic conditions. No deviations in further development was found. Laboratory values, neuroimaging and neurophysiological assessments were normal or nonspecifically changed.
Collapse
Affiliation(s)
- A Hrastovec
- Medical Faculty, University of Ljubljana, Slovenia
| | | | | |
Collapse
|
43
|
Neubauer D, Osredkar D, Paro-Panjan D, Skofljanec A, Derganc M. Recording conventional and amplitude-integrated EEG in neonatal intensive care unit. Eur J Paediatr Neurol 2011; 15:405-16. [PMID: 21802965 DOI: 10.1016/j.ejpn.2011.03.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2010] [Revised: 03/08/2011] [Accepted: 03/08/2011] [Indexed: 10/17/2022]
Abstract
Neonatal electroencephalography (EEG) presents a challenge due to its difficult interpretation that differs significantly from interpretation in older children and adolescents. Also, from the technological point of view, it is more difficult to perform and is not a standard procedure in all neonatal intensive care units (NICUs). During recent years, long-term cerebral function monitoring by the means of amplitude-integrated EEG (aEEG) has become popular in NICUs because it is easy to apply, allows real-time interpretation by the neonatologist treating the newborn, and has predictive value for outcome. On the other side, to record conventional EEG (cEEG), which is still considered the gold standard of neonatal EEG, the EEG technician should not only be well trained in performing neonatal EEG but also has to adapt to suboptimal working conditions. These issues need to be understood when approaching the neonatal cEEG in NICU and the main structure of the article is dedicated to this technique. The authors discuss the benefits of the digitalization and its positive effects on the improvement of NICU recording. The technical aspects as well as the standards for cEEG recording are described, and a section is dedicated to possible artifacts. Thereafter, alternative and concomitant use of aEEG and its benefits are briefly discussed. At the end there is a section that presents a review of our own cEEG and aEEG recordings that were chosen as the most frequently encountered patterns according to Consensus statement on the use of EEG in the intensive care unit.
Collapse
Affiliation(s)
- D Neubauer
- Division of Paediatrics, Dept. of Child, Adolescent and Developmental Neurology, University Medical Centre Ljubljana, Slovenia.
| | | | | | | | | |
Collapse
|
44
|
Rousseff RT, Khuraibet AJ, Neubauer D. The "Child in the Barrel syndrome"--severe pharyngeal-cervical-brachial variant of Guillain-Barre Syndrome in a toddler. Neuropediatrics 2008; 39:354-6. [PMID: 19569002 DOI: 10.1055/s-0029-1202768] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
One week after a flu-like prodrome, an 18-month-old boy developed acute severe, symmetrical, painless weakness and wasting of the shoulder girdle and upper limbs, drooling, dysphagia, dysarthria, atrophy and fasciculations of the tongue. Milder paresis involved the mimic muscles and the neck extensors. The legs were intact with brisk reflexes. The flail immobile upper limbs produced the appearance that the boy was restrained in a narrow barrel. Electrodiagnostic findings suggested demyelinating motor neuropathy sparing the legs. CSF (45 days after onset) was normal. Initial recovery was observed but 70 days after onset the child suffered severe relapse and died from respiratory arrest. This is another rare case of the pharyngeal-cervical-brachial variant of Guillain-Barre syndrome in infancy with an unusual relapsing course leading to a fatal outcome.
Collapse
Affiliation(s)
- R T Rousseff
- 1Department of Clinical Neurophysiology, Ibn-Sina Hospital, Kuwait, Kuwait
| | | | | |
Collapse
|
45
|
Abstract
OBJECTIVE This international omnibus survey investigated the prevalence and characteristics of sleep problems, as well as strategies for resolving sleep problems, in the general population of the USA, France, Germany, Italy, Spain, the UK and Japan. RESEARCH DESIGN AND METHODS A representative sample of the general population aged > or = 15 years was recruited from each country. Questions focused on the nature of sleeping problems, the impact of problems on daily functioning and behavior with regard to resolving sleeping problems. RESULTS A total of 10 132 individuals were included in this survey. The prevalence of sleeping problems was 56% in the USA, 31% in Western Europe and 23% in Japan. Most individuals with sleeping problems considered these to have an impact on their daily functioning, with family life most affected in the Western European sample, personal activities in the US sample and professional activities in the Japanese sample. Almost half of individuals with sleep problems had never taken any steps to resolving them, and the majority of respondents had not spoken with a physician about their problems. Of those individuals who had consulted a physician, drug prescriptions had been given to approximately 50% in Western Europe and the USA and 90% in Japan. CONCLUSIONS Sleeping problems continue to present a considerable burden across Western Europe, the USA and Japan. Despite this, they are under-reported and under-treated, with almost half of affected individuals not taking any steps to resolve their sleeping problems.
Collapse
Affiliation(s)
- D Léger
- Centre du Sommeil et de la Vigilance, Hôtel-Dieu de Paris, Université Paris Descartes, Paris, France.
| | | | | | | |
Collapse
|
46
|
Strazišar B, Neubauer D, Claustrat B, Brun J. L0023 The ontogeny of melatonin production in infants with an apparent life threatening event. Sleep Med 2007. [DOI: 10.1016/s1389-9457(07)70391-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
47
|
Sicardy B, Colas F, Widemann T, Bellucci A, Beisker W, Kretlow M, Ferri F, Lacour S, Lecacheux J, Lellouch E, Pau S, Renner S, Roques F, Fienga A, Etienne C, Martinez C, Glass IS, Baba D, Nagayama T, Nagata T, Itting-Enke S, Bath KL, Bode HJ, Bode F, Lüdemann H, Lüdemann J, Neubauer D, Tegtmeier A, Tegtmeier C, Thomé B, Hund F, deWitt C, Fraser B, Jansen A, Jones T, Schoenau P, Turk C, Meintjies P, Hernandez M, Fiel D, Frappa E, Peyrot A, Teng JP, Vignand M, Hesler G, Payet T, Howell RR, Kidger M, Ortiz JL, Naranjo O, Rosenzweig P, Rapaport M. The two Titan stellar occultations of 14 November 2003. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005je002624] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
48
|
Avcin T, Markelj G, Niksic V, Rener-Primec Z, Cucnik S, Zupancic M, Rozman B, Neubauer D. Estimation of antiphospholipid antibodies in a prospective longitudinal study of children with migraine. Cephalalgia 2004; 24:831-7. [PMID: 15377313 DOI: 10.1111/j.1468-2982.2004.00752.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aim of this study was to determine the prevalence and clinical significance of antiphospholipid antibodies (aPL) in children with migraine. The values of anticardiolipin (aCL) and antibeta2 glycoprotein I (antibeta2GPI) antibodies were assayed by an ELISA method in 52 children with migraine and 22 children with tension-type headache. The control group consisted of 61 apparently healthy children at regular preventive visits. Two monoclonal beta2GPI dependent aCL (HCAL and EY2C9) were used as calibrators. Lupus anticoagulant (LA) was determined by a modified dilute Russell viper venom time test. Persistently positive aPL were observed during the follow-up in 16.3% of children with migraine (9.3% for aCL, 7.0% for antibeta2GPI and 0% for LA) and in 16.7% of children with tension-type headache (11.1% for aCL, 5.6% for antibeta2GPI and 0% for LA). The prevalence of aPL did not differ significantly between patient groups and healthy children. The prevalence of aPL does not appear to be increased in an unselected group of children with migraine, however, the possible role of aPL in individual cases of paediatric migraine can not be excluded.
Collapse
Affiliation(s)
- T Avcin
- Department of Allergology, Rheumatology and Clinical Immunology, University Children's Hospital, Ljubljana, Slovenia.
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Radan I, Rajer E, Ursic Bratina N, Neubauer D, Krzisnik C, Battelino T. Motor activity during asymptomatic nocturnal hypoglycemia in adolescents with type 1 diabetes mellitus. Acta Diabetol 2004; 41:33-7. [PMID: 15224202 DOI: 10.1007/s00592-004-0141-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2001] [Accepted: 12/20/2003] [Indexed: 10/26/2022]
Abstract
Nocturnal hypoglycemia is reported in 13%-56% of adolescents with type 1 diabetes mellitus. It may be asymptomatic in more than 50% of patients. No noninvasive method for detecting asymptomatic nocturnal hypoglycemia (ANH) has so far proven successful. The aim of the present study was to evaluate quantitative changes of motor activity by actigraphy during episodes of ANH in adolescents with type 1 diabetes mellitus. A total of 18 patients aged 10-16 years with a history of ANH were investigated. Blood was sampled at half-hourly intervals between 22.30 and 06.00 hours with a micropump, and an actigraph was fastened to the right wrist. Blood glucose concentrations were measured and compared to motor activity. Nocturnal hypoglycemia was recorded in 10 patients (55%), with blood glucose during periods of hypoglycemia of 3.00+0.17 mmol/l (range, 1.2-3.4 mmol/l), and duration of hypoglycemia of 1.95+1.34 hours (range, 0.5-5.0 hours). All periods of hypoglycemia were clinically asymptomatic. Regression analysis revealed a statistically significant linear correlation ( p=0.03) between blood glucose concentration and the respective 30-min activity counts. Activity counts in patients with nocturnal hypoglycemia were significantly (ANOVA, p<0.02) higher than in patients with normoglycemia. We conclude that low blood glucose was significantly correlated with an increase in motor activity as detected by actigraphy. This implies the possibility of noninvasive screening of asymptomatic nocturnal hypoglycemia.
Collapse
Affiliation(s)
- I Radan
- Department of Pediatric Endocrinology, University Children's Hospital, SI-1000, Ljubljana, Slovenia
| | | | | | | | | | | |
Collapse
|
50
|
Abstract
OBJECTIVES To examine the validity of the "Gaehwiler" actigraph (Gaehwiler Electronics, model Z80-32k V(1)) for the assessment of sleep-wake (S/W) rhythm and sleep structure in infants during the first 6 months of life using an algorithm developed in our laboratory to differentiate sleep and wake states. METHODS A continuous 72 h actigraphic recording was performed in 10 healthy infants at 1, 3 and 6 months of age. The actigraphic data were matched to direct observation of the infants' behavioural states. Using discriminant function analysis a scoring algorithm for automatic identification of S/W states from raw activity data was developed. The chi-square periodogram analysis was performed to estimate periodic components of S/W rhythm. RESULTS The overall agreement rates between the actigraphic and observer scoring for S/W were between 87 and 95% for the infants after the third month of life, while for the 1-month-old infants they never exceeded 72%. The actigraphic discrimination between active and quiet sleep was the best in 3-month-old infants. The circadian influence on S/W rhythm was already present by the end of the first month of life. CONCLUSIONS Using the "Gaehwiler" actigraph in our study, valid discrimination between sleep and wake states was obtained in infants during 3 and 6 months. The actigraph, however, did not provide valid active vs. quiet sleep state measures. The circadian rhythm of S/W was observed as early as during the first month of life.
Collapse
Affiliation(s)
- B Gnidovec
- Institute of Clinical Neurophysiology, Division of Neurology, University Medical Centre, Zaloska 7, SI-1525 Ljubljana, Slovenia.
| | | | | |
Collapse
|