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Savelyeva IO, Zhdanova KA, Gradova MA, Gradov OV, Bragina NA. Cationic Porphyrins as Antimicrobial and Antiviral Agents in Photodynamic Therapy. Curr Issues Mol Biol 2023; 45:9793-9822. [PMID: 38132458 PMCID: PMC10741785 DOI: 10.3390/cimb45120612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/30/2023] [Accepted: 12/01/2023] [Indexed: 12/23/2023] Open
Abstract
Antimicrobial photodynamic therapy (APDT) has received a great deal of attention due to its unique ability to kill all currently known classes of microorganisms. To date, infectious diseases caused by bacteria and viruses are one of the main sources of high mortality, mass epidemics and global pandemics among humans. Every year, the emergence of three to four previously unknown species of viruses dangerous to humans is recorded, totaling more than 2/3 of all newly discovered human pathogens. The emergence of bacteria with multidrug resistance leads to the rapid obsolescence of antibiotics and the need to create new types of antibiotics. From this point of view, photodynamic inactivation of viruses and bacteria is of particular interest. This review summarizes the most relevant mechanisms of antiviral and antibacterial action of APDT, molecular targets and correlation between the structure of cationic porphyrins and their photodynamic activity.
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Affiliation(s)
- Inga O. Savelyeva
- Institute of Fine Chemical Technology, MIREA—Russian Technological University, Vernadsky Prospect 86, Moscow 119571, Russia; (I.O.S.); (K.A.Z.); (N.A.B.)
| | - Kseniya A. Zhdanova
- Institute of Fine Chemical Technology, MIREA—Russian Technological University, Vernadsky Prospect 86, Moscow 119571, Russia; (I.O.S.); (K.A.Z.); (N.A.B.)
| | - Margarita A. Gradova
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Kosygin Street 4, Moscow 119991, Russia;
| | - Oleg V. Gradov
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Kosygin Street 4, Moscow 119991, Russia;
| | - Natal’ya A. Bragina
- Institute of Fine Chemical Technology, MIREA—Russian Technological University, Vernadsky Prospect 86, Moscow 119571, Russia; (I.O.S.); (K.A.Z.); (N.A.B.)
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Yanten N, Vilches S, Palavecino CE. Photodynamic therapy for the treatment of Pseudomonas aeruginosa infections: A scoping review. Photodiagnosis Photodyn Ther 2023; 44:103803. [PMID: 37709240 DOI: 10.1016/j.pdpdt.2023.103803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 09/16/2023]
Abstract
BACKGROUND Pseudomonas aeruginosa is a Gram-negative bacillus that causes superficial and deep infections, which can be minor to life-threatening. Recently, P. aeruginosa has gained significant relevance due to the increased incidence of multidrug-resistant (MDR) strains that complicate antibiotic treatment. Due to MDR strains, alternative therapies, such as antimicrobial photodynamic therapy (PDT), are presented as a good option to treat nonsystemic infections. PDT combines a photosensitizer agent (PS), light, and oxygen to generate free radicals that destroy bacterial structures such as the envelope, matrix, and genetic material. This work aimed to identify the development stage of the PDT applied to P. aeruginosa to conclude which research stage should be emphasized more. METHODS Systematic bibliographic search in various public databases was performed. Related articles were identified using keywords, and relevant ones were selected using inclusion and exclusion criteria according to the PRISMA protocol. RESULTS We found 29 articles that meet the criteria, constituting a good body of evidence associated with using PDT against P. aeruginosa in vitro and less developed for in vivo research. CONCLUSIONS We conclude that PDT could become an effective adjunct to antimicrobial therapy against P. aeruginosa. This effectiveness depends on the PS used and the location of the infection. Many PS already demonstrated efficacy in PDT, but the evidence is supported significantly by in vitro and very few in vivo studies. Therefore, we conclude that further research efforts should focus on demonstrating the safety and efficacy of these PSs in vivo in animal infection models.
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Affiliation(s)
- Nicolas Yanten
- Laboratorio de Microbiología Celular, Instituto de Investigación y Postgrado, Facultad de Medicina y Ciencias de la Salud, Universidad Central de Chile, Lord Cochrane 418, 8330546, Santiago, Chile
| | - Selene Vilches
- Laboratorio de Microbiología Celular, Instituto de Investigación y Postgrado, Facultad de Medicina y Ciencias de la Salud, Universidad Central de Chile, Lord Cochrane 418, 8330546, Santiago, Chile
| | - Christian Erick Palavecino
- Laboratorio de Microbiología Celular, Instituto de Investigación y Postgrado, Facultad de Medicina y Ciencias de la Salud, Universidad Central de Chile, Lord Cochrane 418, 8330546, Santiago, Chile.
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Lebepe TC, Maluleke R, Mgedle N, Oluwafemi OS. Porphyrin as a Cryoprotectant for Graphene Oxide-Coated Gold Nanorods to Produce Conjugated Product with Improved Stability and Opto-Phototherapeutic Properties. Pharmaceutics 2023; 15:2538. [PMID: 38004518 PMCID: PMC10674824 DOI: 10.3390/pharmaceutics15112538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 10/22/2023] [Accepted: 10/24/2023] [Indexed: 11/26/2023] Open
Abstract
Graphene oxide (GO) as a coating material for gold nanorods (AuNRs) has gained interest in reducing toxicity and improving the photothermal profiling of AuNRs. However, there is still a challenge regarding the storage of colloidal suspensions of GO-coated AuNRs (GO@AuNRs). Hence, the conjugation of GO@AuNRs to meso-tetra-(4-sulfonatophenyl)porphyrin (TPPS4), an anionic water-soluble porphyrin, has been reported to enhance their re-dispensability and improve their phototherapeutic properties. The AuNRs and GO were synthesised using seed-mediated and Hummers' methods, respectively. The GO@AuNRs were conjugated to TPPS4 and characterised using ultraviolet-visible-near-infrared (UV-Vis-NIR) spectroscopy, zeta analyser, dynamic light scattering (DLS), photoluminescence spectroscopy (PL), x-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and Fourier-transform infrared spectroscopy (FTIR) before freeze-drying. The results showed that the AuNRs were sandwiched between GO and TPPS4. After freeze-drying, the freeze-dried conjugate was dispensed in deionised water without adding cryoprotectants and its properties were compared to those of the unfreeze-dried conjugate. The results showed that the freeze-dried conjugate contained similar optical properties to the unfreeze-dried conjugate. However, the bare GO@AuNRs showed a change in the optical properties after freeze-drying. These results revealed that porphyrin is an excellent additive to reduce the freeze-drying stress tolerance of GO@AuNRs. The freeze-dried conjugate also showed both singlet oxygen and photothermal properties of GO@AuNRs and porphyrin. These results indicated that the freeze-dried conjugate is a promising dual photodynamic and photothermal agent, and porphyrin can act as a cryoprotectant.
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Affiliation(s)
- Thabang Calvin Lebepe
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa; (T.C.L.); (R.M.); (N.M.)
- Department of Chemical Sciences, University of Johannesburg, Johannesburg 2028, South Africa
| | - Rodney Maluleke
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa; (T.C.L.); (R.M.); (N.M.)
- Department of Chemical Sciences, University of Johannesburg, Johannesburg 2028, South Africa
| | - Nande Mgedle
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa; (T.C.L.); (R.M.); (N.M.)
- Department of Chemical Sciences, University of Johannesburg, Johannesburg 2028, South Africa
| | - Oluwatobi Samuel Oluwafemi
- Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa; (T.C.L.); (R.M.); (N.M.)
- Department of Chemical Sciences, University of Johannesburg, Johannesburg 2028, South Africa
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4
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Virzì NF, Fallica AN, Romeo G, Greish K, Alghamdi MA, Patanè S, Mazzaglia A, Shahid M, Pittalà V. Curcumin I-SMA nanomicelles as promising therapeutic tool to tackle bacterial infections. RSC Adv 2023; 13:31059-31066. [PMID: 37881762 PMCID: PMC10594152 DOI: 10.1039/d3ra04885c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 10/16/2023] [Indexed: 10/27/2023] Open
Abstract
Renewed interest towards natural substances has been pushed by the widespread diffusion of antibiotic resistance. Curcumin I is the most active and effective constituent of curcuminoids extracted from Curcuma longa and, among other beneficial effects, attracted attention for its antimicrobial potential. Since the poor pharmacokinetic profile hinders its efficient utilization, in the present paper, we report encapsulation of curcumin I in poly(styrene-co-maleic acid) (SMA-CUR) providing a nanomicellar system with improved aqueous solubility and bioavailability. SMA-CUR was characterized by means of size, zeta potential, polydispersity index, atomic force microscopy (AFM), drug release studies, spectroscopic properties and stability. SMA-CUR nanoformulation displayed exciting antimicrobial properties compared to free curcumin I towards Gram-positive and Gram-negative clinical isolates.
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Affiliation(s)
- Nicola F Virzì
- Department of Drug and Health Science, University of Catania Viale A. Doria 6 95125 Catania Italy
| | - Antonino N Fallica
- Department of Drug and Health Science, University of Catania Viale A. Doria 6 95125 Catania Italy
| | - Giuseppe Romeo
- Department of Drug and Health Science, University of Catania Viale A. Doria 6 95125 Catania Italy
| | - Khaled Greish
- Department of Molecular Medicine, Arabian Gulf University Manama 329 Bahrain
| | - Maha Ali Alghamdi
- Department of Molecular Medicine, Arabian Gulf University Manama 329 Bahrain
| | - Salvatore Patanè
- Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina V.le F. Stagno D'Alcontres 31 98166 Messina Italy
| | - Antonino Mazzaglia
- National Council of Research, Institute for the Study of Nanostructured Materials (CNR-ISMN), URT of Messina c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina V.le F. Stagno d'Alcontres 31 98166 Messina Italy
| | - Mohammad Shahid
- Department of Microbiology & Immunology, Arabian Gulf University Manama 329 Bahrain
| | - Valeria Pittalà
- Department of Drug and Health Science, University of Catania Viale A. Doria 6 95125 Catania Italy
- Department of Molecular Medicine, Arabian Gulf University Manama 329 Bahrain
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Zagami R, Rubin Pedrazzo A, Franco D, Caldera F, De Plano LM, Trapani M, Patanè S, Trotta F, Mazzaglia A. Supramolecular Assemblies based on Polymeric Cyclodextrin Nanosponges and a Cationic Porphyrin with Antimicrobial Photodynamic Therapy Action. Int J Pharm 2023; 637:122883. [PMID: 36972777 DOI: 10.1016/j.ijpharm.2023.122883] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 03/19/2023] [Accepted: 03/20/2023] [Indexed: 03/29/2023]
Abstract
Within of the increasing requirement of alternative approaches to fight emerging infections, nano-photosensitisers (nanoPS) are currently designed with the aim to optimize the antimicrobial photodynamic (aPDT) efficacy. The utilize of less expensive nanocarriers prepared by simple and eco-friendly methodologies and commercial photosensitisers are highly desiderable. In this direction, here we propose a novel nanoassembly composed of water soluble anionic polyester β-CD nanosponges (β-CD-PYRO hereafter named βNS) and the cationic 5,10,15,20-tetrakis(1-methylpyridinium-4- yl)porphine (TMPyP). Nanoassemblies were prepared in ultrapure water by mixing PS and βNS, by exploiting their mutual electrostatic interaction, and characterized by various spectroscopic techniques such as UV/Vis, Steady-State and Time Resolved Fluorescence, Dynamic Light Scattering and ζ-potential. NanoPS produce appreciable amount of single oxygen similar to free porphyrin and a prolonged stability after 6 days of incubations in physiological conditions and following photoirradiation. Antimicrobial photodynamic action against fatal hospital-acquired infections such as P. aeruginosa and S. aureus was investigated by pointing out the ability of cationic porphyrin loaded- CD nanosponges to photo-kill bacterial cells at prolonged time of incubation and following irradiation (MBC99 = 3.75 µM, light dose = 54.82 J/cm2).
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Affiliation(s)
- Roberto Zagami
- CNR-ISMN, Istituto per lo Studio dei Materiali Nanostrutturati, URT Messina c/o Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, University of Messina, Viale F. Stagno d'Alcontres 31, Messina 98166, Italy; Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, University of Messina, Viale F. Stagno d'Alcontres 31, Messina 98166, Italy
| | | | - Domenico Franco
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, University of Messina, Viale F. Stagno d'Alcontres 31, Messina 98166, Italy
| | - Fabrizio Caldera
- Dipartimento di Chimica, University of Torino, Via Pietro Giuria 7, 10125 Torino, Italy
| | - Laura M De Plano
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, University of Messina, Viale F. Stagno d'Alcontres 31, Messina 98166, Italy
| | - Mariachiara Trapani
- CNR-ISMN, Istituto per lo Studio dei Materiali Nanostrutturati, URT Messina c/o Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, University of Messina, Viale F. Stagno d'Alcontres 31, Messina 98166, Italy
| | - Salvatore Patanè
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, Viale F. Stagno d'Alcontres, 31, 98166 Messina, Italy
| | - Francesco Trotta
- Dipartimento di Chimica, University of Torino, Via Pietro Giuria 7, 10125 Torino, Italy
| | - Antonino Mazzaglia
- CNR-ISMN, Istituto per lo Studio dei Materiali Nanostrutturati, URT Messina c/o Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, University of Messina, Viale F. Stagno d'Alcontres 31, Messina 98166, Italy
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Antimicrobial and Antibiofilm Photodynamic Action of Photosensitizing Nanoassemblies Based on Sulfobutylether-β-Cyclodextrin. Molecules 2023; 28:molecules28062493. [PMID: 36985465 PMCID: PMC10051317 DOI: 10.3390/molecules28062493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Revised: 03/02/2023] [Accepted: 03/06/2023] [Indexed: 03/11/2023] Open
Abstract
Developing new broad-spectrum antimicrobial strategies, as alternatives to antibiotics and being able to efficiently inactivate pathogens without inducing resistance, is one of the main objectives in public health. Antimicrobial photodynamic therapy (aPDT), based on the light-induced production of reactive oxygen species from photosensitizers (PS), is attracting growing interest in the context of infection treatment, also including biofilm destruction. Due to the limited photostability of free PS, delivery systems are increasingly needed in order to decrease PS photodegradation, thus improving the therapeutic efficacy, as well as to reduce collateral effects on unaffected tissues. In this study, we propose a photosensitizing nanosystem based on the cationic porphyrin 5,10,15,20-tetrakis (N-methyl- 4-pyridyl)-21H,23H-porphyrin (TMPyP), complexed with the commerical sulfobutylether-beta-cyclodextrin (CAPTISOL®), at a 1:50 molar ratio (CAPTISOL®/TMPyP)50_1. Nanoassemblies based on (CAPTISOL®/TMPyP)50_1 with photodynamic features exhibited photo-antimicrobial activity against Gram-negative and Gram-positive bacteria. Moreover, results from P. aeruginosa reveal that CAPTISOL® alone inhibits pyocyanin (PYO) production, also affecting bacterial biofilm formation. Finally, we obtained a synergistic effect of inhibition and destruction of P. aeruginosa biofilm by using the combination of CAPTISOL® and TMPyP.
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Lebepe TC, Parani S, Ncapayi V, Maluleke R, Mbaz GIM, Fanoro OT, Varghese JR, Komiya A, Kodama T, Oluwafemi OS. Graphene Oxide-Gold Nanorods Nanocomposite-Porphyrin Conjugate as Promising Tool for Cancer Phototherapy Performance. Pharmaceuticals (Basel) 2021; 14:ph14121295. [PMID: 34959695 PMCID: PMC8706362 DOI: 10.3390/ph14121295] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 11/27/2021] [Accepted: 12/01/2021] [Indexed: 12/26/2022] Open
Abstract
The cancer mortality rate has increased, and conventional cancer treatments are known for having many side effects. Therefore, it is imperative to find a new therapeutic agent or modify the existing therapeutic agents for better performance and efficiency. Herein, a synergetic phototherapeutic agent based on a combination of photothermal and photodynamic therapy is proposed. The phototherapeutic agent consists of water-soluble cationic porphyrin (5,10,15,20-tetrakis(N-methylpyridinium-3-yl)porphyrin, TMePyP), and gold nanorods (AuNRs) anchored on graphene-oxide (GO) sheet. The TMePyP was initially synthesized by Adler method, followed by methylation, while GO and AuNRs were synthesized using Hummer’s and seed-mediated methods, respectively. The structural and optical properties of TMePyP were confirmed using UV-Vis, zeta analyzer, PL, FTIR and NMR. The formation of both GO and AuNRs was confirmed by UV-Vis-NIR, FTIR, TEM and zeta analyzer. TMePyP and AuNRs were anchored on GO to form GO@AuNRs-TMePyP nanocomposite. The as-synthesized nanocomposite was stable in RPMI and PBS medium, and, on irradiation, produced high heat than the bare AuNRs, with high photothermal efficiency. In addition, the nanocomposite produced higher singlet oxygen than TMePyP with high biocompatibility in the absence of light. These results indicated that the as-synthesized nanocomposite is a promising dual photodynamic and photothermal agent for cancer therapy.
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Affiliation(s)
- Thabang Calvin Lebepe
- Department of Chemical Science, University of Johannesburg, Johannesburg 2028, South Africa; (T.C.L.); (S.P.); (V.N.); (R.M.); (G.I.M.M.); (J.R.V.)
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Johannesburg 2028, South Africa;
| | - Sundararajan Parani
- Department of Chemical Science, University of Johannesburg, Johannesburg 2028, South Africa; (T.C.L.); (S.P.); (V.N.); (R.M.); (G.I.M.M.); (J.R.V.)
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Johannesburg 2028, South Africa;
| | - Vuyelwa Ncapayi
- Department of Chemical Science, University of Johannesburg, Johannesburg 2028, South Africa; (T.C.L.); (S.P.); (V.N.); (R.M.); (G.I.M.M.); (J.R.V.)
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Johannesburg 2028, South Africa;
| | - Rodney Maluleke
- Department of Chemical Science, University of Johannesburg, Johannesburg 2028, South Africa; (T.C.L.); (S.P.); (V.N.); (R.M.); (G.I.M.M.); (J.R.V.)
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Johannesburg 2028, South Africa;
| | - Grace It Mwad Mbaz
- Department of Chemical Science, University of Johannesburg, Johannesburg 2028, South Africa; (T.C.L.); (S.P.); (V.N.); (R.M.); (G.I.M.M.); (J.R.V.)
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Johannesburg 2028, South Africa;
| | - Olufunto Tolulope Fanoro
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Johannesburg 2028, South Africa;
| | - Jose Rajendran Varghese
- Department of Chemical Science, University of Johannesburg, Johannesburg 2028, South Africa; (T.C.L.); (S.P.); (V.N.); (R.M.); (G.I.M.M.); (J.R.V.)
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Johannesburg 2028, South Africa;
| | - Atsuki Komiya
- Institute of Fluid Science, Tohoku University, Sendai 980-8577, Japan;
| | - Tetsuya Kodama
- Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-8575, Japan;
| | - Oluwatobi Samuel Oluwafemi
- Department of Chemical Science, University of Johannesburg, Johannesburg 2028, South Africa; (T.C.L.); (S.P.); (V.N.); (R.M.); (G.I.M.M.); (J.R.V.)
- Centre for Nanomaterials Sciences Research, University of Johannesburg, Johannesburg 2028, South Africa;
- Correspondence:
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Rahman MU, Wang W, Sun Q, Shah JA, Li C, Sun Y, Li Y, Zhang B, Chen W, Wang S. Endolysin, a Promising Solution against Antimicrobial Resistance. Antibiotics (Basel) 2021; 10:1277. [PMID: 34827215 PMCID: PMC8614784 DOI: 10.3390/antibiotics10111277] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/14/2021] [Accepted: 10/16/2021] [Indexed: 12/24/2022] Open
Abstract
Antimicrobial resistance (AMR) is a global crisis for human public health which threatens the effective prevention and control of ever-increasing infectious diseases. The advent of pandrug-resistant bacteria makes most, if not all, available antibiotics invalid. Meanwhile, the pipeline of novel antibiotics development stagnates, which prompts scientists and pharmacists to develop unconventional antimicrobials. Bacteriophage-derived endolysins are cell wall hydrolases which could hydrolyze the peptidoglycan layer from within and outside of bacterial pathogens. With high specificity, rapid action, high efficiency, and low risk of resistance development, endolysins are believed to be among the best alternative therapeutic agents to treat multidrug resistant (MDR) bacteria. As of now, endolysins have been applied to diverse aspects. In this review, we comprehensively introduce the structures and activities of endolysins and summarize the latest application progress of recombinant endolysins in the fields of medical treatment, pathogen diagnosis, food safety, and agriculture.
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Affiliation(s)
- Mujeeb ur Rahman
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi’an 710069, China; (M.u.R.); (Q.S.); (C.L.); (Y.S.); (Y.L.)
| | - Weixiao Wang
- Clinical Research Center, The Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing 210003, China;
| | - Qingqing Sun
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi’an 710069, China; (M.u.R.); (Q.S.); (C.L.); (Y.S.); (Y.L.)
| | - Junaid Ali Shah
- College of Life Sciences, Jilin University, Changchun 130012, China;
| | - Chao Li
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi’an 710069, China; (M.u.R.); (Q.S.); (C.L.); (Y.S.); (Y.L.)
| | - Yanmei Sun
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi’an 710069, China; (M.u.R.); (Q.S.); (C.L.); (Y.S.); (Y.L.)
| | - Yuanrui Li
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi’an 710069, China; (M.u.R.); (Q.S.); (C.L.); (Y.S.); (Y.L.)
| | - Bailing Zhang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China;
| | - Wei Chen
- Clinical Research Center, The Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing 210003, China;
| | - Shiwei Wang
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi’an 710069, China; (M.u.R.); (Q.S.); (C.L.); (Y.S.); (Y.L.)
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Amankwah S, Abdella K, Kassa T. Bacterial Biofilm Destruction: A Focused Review On The Recent Use of Phage-Based Strategies With Other Antibiofilm Agents. Nanotechnol Sci Appl 2021; 14:161-177. [PMID: 34548785 PMCID: PMC8449863 DOI: 10.2147/nsa.s325594] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Accepted: 08/20/2021] [Indexed: 12/11/2022] Open
Abstract
Biofilms are bacterial communities that live in association with biotic or abiotic surfaces and enclosed in an extracellular polymeric substance. Their formation on both biotic and abiotic surfaces, including human tissue and medical device surfaces, pose a major threat causing chronic infections. In addition, current antibiotics and antiseptic agents have shown limited ability to completely remove biofilms. In this review, the authors provide an overview on the formation of bacterial biofilms and its characteristics, burden and evolution with phages. Moreover, the most recent possible use of phages and phage-derived enzymes to combat bacteria in biofilm structures is elucidated. From the emerging results, it can be concluded that despite successful use of phages and phage-derived products in destroying biofilms, they are mostly not adequate to eradicate all bacterial cells. Nevertheless, a combined therapy with the use of phages and/or phage-derived products with other antimicrobial agents including antibiotics, nanoparticles, and antimicrobial peptides may be effective approaches to remove biofilms from medical device surfaces and to treat their associated infections in humans.
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Affiliation(s)
- Stephen Amankwah
- School of Medical Laboratory Sciences, Institute of Health, Jimma University, Jimma, Ethiopia
- Accra Medical Centre, Accra, Ghana
| | - Kedir Abdella
- School of Medical Laboratory Sciences, Institute of Health, Jimma University, Jimma, Ethiopia
| | - Tesfaye Kassa
- School of Medical Laboratory Sciences, Institute of Health, Jimma University, Jimma, Ethiopia
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Oyim J, Omolo CA, Amuhaya EK. Photodynamic Antimicrobial Chemotherapy: Advancements in Porphyrin-Based Photosensitize Development. Front Chem 2021; 9:635344. [PMID: 33898388 PMCID: PMC8058465 DOI: 10.3389/fchem.2021.635344] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 02/15/2021] [Indexed: 12/13/2022] Open
Abstract
The reduction of available drugs with effectiveness against microbes is worsening with the current global crisis of antimicrobial resistance. This calls for innovative strategies for combating antimicrobial resistance. Photodynamic Antimicrobial Chemotherapy (PACT) is a relatively new method that utilizes the combined action of light, oxygen, and a photosensitizer to bring about the destruction of microorganisms. This technique has been found to be effective against a wide spectrum of microorganisms, including bacteria, viruses, and fungi. Of greater interest is their ability to destroy resistant strains of microorganisms and in effect help in combating the emergence of antimicrobial resistance. This manuscript reviews porphyrins and porphyrin-type photosensitizers that have been studied in the recent past with a focus on their structure-activity relationship.
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Affiliation(s)
- James Oyim
- School of Pharmacy and Health Sciences, United States International University-Africa, Nairobi, Kenya
- Department of Chemistry, University of Nairobi, Nairobi, Kenya
| | - Calvin A. Omolo
- School of Pharmacy and Health Sciences, United States International University-Africa, Nairobi, Kenya
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Edith K. Amuhaya
- School of Pharmacy and Health Sciences, United States International University-Africa, Nairobi, Kenya
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11
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Franco D, Calabrese G, Petralia S, Neri G, Corsaro C, Forte L, Squarzoni S, Guglielmino S, Traina F, Fazio E, Conoci S. Antimicrobial Effect and Cytotoxic Evaluation of Mg-Doped Hydroxyapatite Functionalized with Au-Nano Rods. Molecules 2021; 26:molecules26041099. [PMID: 33669712 PMCID: PMC7923154 DOI: 10.3390/molecules26041099] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Revised: 02/07/2021] [Accepted: 02/16/2021] [Indexed: 02/07/2023] Open
Abstract
Hydroxyapatite (HA) is the main inorganic mineral that constitutes bone matrix and represents the most used biomaterial for bone regeneration. Over the years, it has been demonstrated that HA exhibits good biocompatibility, osteoconductivity, and osteoinductivity both in vitro and in vivo, and can be prepared by synthetic and natural sources via easy fabrication strategies. However, its low antibacterial property and its fragile nature restricts its usage for bone graft applications. In this study we functionalized a MgHA scaffold with gold nanorods (AuNRs) and evaluated its antibacterial effect against S. aureus and E. coli in both suspension and adhesion and its cytotoxicity over time (1 to 24 days). Results show that the AuNRs nano-functionalization improves the antibacterial activity with 100% bacterial reduction after 24 h. The toxicity study, however, indicates a 4.38-fold cell number decrease at 24 days. Although further optimization on nano-functionalization process are needed for cytotoxicity, these data indicated that Au-NRs nano-functionalization is a very promising method for improving the antibacterial properties of HA.
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Affiliation(s)
- Domenico Franco
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy; (D.F.); (G.C.); (G.N.); (S.G.)
| | - Giovanna Calabrese
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy; (D.F.); (G.C.); (G.N.); (S.G.)
| | - Salvatore Petralia
- Department of Drug Science and Health, University of Catania, 95125 Catania, Italy;
| | - Giulia Neri
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy; (D.F.); (G.C.); (G.N.); (S.G.)
| | - Carmelo Corsaro
- Department of Mathematical and Computational Sciences, Physics Science and Earth Science, University of Messina, 98166 Messina, Italy; (C.C.); (E.F.)
| | | | - Stefano Squarzoni
- CNR-Institute of Molecular Genetics “Luigi Luca Cavalli-Sforza”, 40136 Bologna, Italy;
- IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy;
| | - Salvatore Guglielmino
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy; (D.F.); (G.C.); (G.N.); (S.G.)
| | - Francesco Traina
- IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy;
- Department of Biomedical, Dental, Morphological and Functional Imaging Sciences, University of Messina, 98125 Messina, Italy
| | - Enza Fazio
- Department of Mathematical and Computational Sciences, Physics Science and Earth Science, University of Messina, 98166 Messina, Italy; (C.C.); (E.F.)
| | - Sabrina Conoci
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy; (D.F.); (G.C.); (G.N.); (S.G.)
- Correspondence: ; Tel.: +39-090-676-1
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12
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Topka-Bielecka G, Dydecka A, Necel A, Bloch S, Nejman-Faleńczyk B, Węgrzyn G, Węgrzyn A. Bacteriophage-Derived Depolymerases against Bacterial Biofilm. Antibiotics (Basel) 2021; 10:175. [PMID: 33578658 PMCID: PMC7916357 DOI: 10.3390/antibiotics10020175] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 02/03/2021] [Accepted: 02/06/2021] [Indexed: 12/11/2022] Open
Abstract
In addition to specific antibiotic resistance, the formation of bacterial biofilm causes another level of complications in attempts to eradicate pathogenic or harmful bacteria, including difficult penetration of drugs through biofilm structures to bacterial cells, impairment of immunological response of the host, and accumulation of various bioactive compounds (enzymes and others) affecting host physiology and changing local pH values, which further influence various biological functions. In this review article, we provide an overview on the formation of bacterial biofilm and its properties, and then we focus on the possible use of phage-derived depolymerases to combat bacterial cells included in this complex structure. On the basis of the literature review, we conclude that, although these bacteriophage-encoded enzymes may be effective in destroying specific compounds involved in the formation of biofilm, they are rarely sufficient to eradicate all bacterial cells. Nevertheless, a combined therapy, employing depolymerases together with antibiotics and/or other antibacterial agents or factors, may provide an effective approach to treat infections caused by bacteria able to form biofilms.
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Affiliation(s)
- Gracja Topka-Bielecka
- Department of Molecular Biology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (G.T.-B.); (A.D.); (A.N.); (B.N.-F.); (G.W.)
| | - Aleksandra Dydecka
- Department of Molecular Biology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (G.T.-B.); (A.D.); (A.N.); (B.N.-F.); (G.W.)
| | - Agnieszka Necel
- Department of Molecular Biology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (G.T.-B.); (A.D.); (A.N.); (B.N.-F.); (G.W.)
| | - Sylwia Bloch
- Laboratory of Phage Therapy, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Kładki 24, 80-822 Gdańsk, Poland;
| | - Bożena Nejman-Faleńczyk
- Department of Molecular Biology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (G.T.-B.); (A.D.); (A.N.); (B.N.-F.); (G.W.)
| | - Grzegorz Węgrzyn
- Department of Molecular Biology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (G.T.-B.); (A.D.); (A.N.); (B.N.-F.); (G.W.)
| | - Alicja Węgrzyn
- Laboratory of Phage Therapy, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Kładki 24, 80-822 Gdańsk, Poland;
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13
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Klausen M, Ucuncu M, Bradley M. Design of Photosensitizing Agents for Targeted Antimicrobial Photodynamic Therapy. Molecules 2020; 25:E5239. [PMID: 33182751 PMCID: PMC7696090 DOI: 10.3390/molecules25225239] [Citation(s) in RCA: 77] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 11/04/2020] [Accepted: 11/05/2020] [Indexed: 12/18/2022] Open
Abstract
Photodynamic inactivation of microorganisms has gained substantial attention due to its unique mode of action, in which pathogens are unable to generate resistance, and due to the fact that it can be applied in a minimally invasive manner. In photodynamic therapy (PDT), a non-toxic photosensitizer (PS) is activated by a specific wavelength of light and generates highly cytotoxic reactive oxygen species (ROS) such as superoxide (O2-, type-I mechanism) or singlet oxygen (1O2*, type-II mechanism). Although it offers many advantages over conventional treatment methods, ROS-mediated microbial killing is often faced with the issues of accessibility, poor selectivity and off-target damage. Thus, several strategies have been employed to develop target-specific antimicrobial PDT (aPDT). This includes conjugation of known PS building-blocks to either non-specific cationic moieties or target-specific antibiotics and antimicrobial peptides, or combining them with targeting nanomaterials. In this review, we summarise these general strategies and related challenges, and highlight recent developments in targeted aPDT.
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Affiliation(s)
- Maxime Klausen
- School of Chemistry and the EPSRC IRC Proteus, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, UK;
| | - Muhammed Ucuncu
- School of Chemistry and the EPSRC IRC Proteus, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, UK;
- Department of Analytical Chemistry, Faculty of Pharmacy, Izmir Katip Celebi University, Izmir 35620, Turkey
| | - Mark Bradley
- School of Chemistry and the EPSRC IRC Proteus, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, UK;
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14
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Cordaro A, Zagami R, Malanga M, Venkatesan JK, Alvarez-Lorenzo C, Cucchiarini M, Piperno A, Mazzaglia A. Cyclodextrin Cationic Polymer-Based Nanoassemblies to Manage Inflammation by Intra-Articular Delivery Strategies. NANOMATERIALS 2020; 10:nano10091712. [PMID: 32872542 PMCID: PMC7558260 DOI: 10.3390/nano10091712] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/26/2020] [Accepted: 08/27/2020] [Indexed: 12/31/2022]
Abstract
Injectable nanobioplatforms capable of locally fighting the inflammation in osteoarticular diseases, by reducing the number of administrations and prolonging the therapeutic effect is highly challenging. β-Cyclodextrin cationic polymers are promising cartilage-penetrating candidates by intra-articular injection due to the high biocompatibility and ability to entrap multiple therapeutic and diagnostic agents, thus monitoring and mitigating inflammation. In this study, nanoassemblies based on poly-β-amino-cyclodextrin (PolyCD) loaded with the non-steroidal anti-inflammatory drug diclofenac (DCF) and linked by supramolecular interactions with a fluorescent probe (adamantanyl-Rhodamine conjugate, Ada-Rhod) were developed to manage inflammation in osteoarticular diseases. PolyCD@Ada-Rhod/DCF supramolecular nanoassemblies were characterized by complementary spectroscopic techniques including UV-Vis, steady-state and time-resolved fluorescence, DLS and ζ-potential measurement. Stability and DCF release kinetics were investigated in medium mimicking the physiological conditions to ensure control over time and efficacy. Biological experiments evidenced the efficient cellular internalization of PolyCD@Ada-Rhod/DCF (within two hours) without significant cytotoxicity in primary human bone marrow-derived mesenchymal stromal cells (hMSCs). Finally, polyCD@Ada-Rhod/DCF significantly suppressed IL-1β production in hMSCs, revealing the anti-inflammatory properties of these nanoassemblies. With these premises, this study might open novel routes to exploit original CD-based nanobiomaterials for the treatment of osteoarticular diseases.
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Affiliation(s)
- Annalaura Cordaro
- CNR-ISMN, Istituto per lo Studio dei Materiali Nanostrutturati, V. le F. Stagno d’Alcontres 31, 98166 Messina, Italy; (A.C.); (R.Z.)
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, V. le F. Stagno d’Alcontres 31, 98166 Messina, Italy
| | - Roberto Zagami
- CNR-ISMN, Istituto per lo Studio dei Materiali Nanostrutturati, V. le F. Stagno d’Alcontres 31, 98166 Messina, Italy; (A.C.); (R.Z.)
| | - Milo Malanga
- CycloLab, Illatos út 7, H-1097 Budapest, Hungary;
| | - Jagadeesh Kumar Venkatesan
- Center of Experimental Orthopaedics, Saarland University Medical Center, Kirrbergerstr. Bldg 37, D-66421 Homburg/Saar, Germany; (J.K.V.); (M.C.)
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, I+DFarma (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15872 Santiago de Compostela, Spain;
| | - Magali Cucchiarini
- Center of Experimental Orthopaedics, Saarland University Medical Center, Kirrbergerstr. Bldg 37, D-66421 Homburg/Saar, Germany; (J.K.V.); (M.C.)
| | - Anna Piperno
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, V. le F. Stagno d’Alcontres 31, 98166 Messina, Italy
- Correspondence: (A.P.); (A.M.)
| | - Antonino Mazzaglia
- CNR-ISMN, Istituto per lo Studio dei Materiali Nanostrutturati, V. le F. Stagno d’Alcontres 31, 98166 Messina, Italy; (A.C.); (R.Z.)
- Correspondence: (A.P.); (A.M.)
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15
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Calabrese G, Petralia S, Franco D, Nocito G, Fabbi C, Forte L, Guglielmino S, Squarzoni S, Traina F, Conoci S. A new Ag-nanostructured hydroxyapatite porous scaffold: Antibacterial effect and cytotoxicity study. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 118:111394. [PMID: 33254999 DOI: 10.1016/j.msec.2020.111394] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 08/07/2020] [Accepted: 08/19/2020] [Indexed: 12/25/2022]
Abstract
We report a new chemical method for the functionalization of Mg-hydroxyapatite (Mg-HA) scaffold with Ag nanoparticles (Ag NPs) integrating in one step both the synthesis of the Ag NPs and their nano-structuring into the HA matrix (Ag-Mg-HA scaffold). This method exploits a green photochemical synthesis and allows the direct growth of Ag NPs on the Mg-HA surface. The surface structure of Ag-Mg-HA scaffold, investigated by scanning electron microscopy, shows no significant changes in the morphology upon Ag NPs incorporation. The presence of Ag was confirmed by EDX analysis. TEM and spectroscopic investigations show Ag NPs spherical shaped with a mean diameter of about 20 nm exhibiting the typical plasmon absorption band with maximum at 420 nm. The antibacterial properties of Ag-Mg-HA scaffolds were tested against two bacterial strains, Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The results show excellent antibacterial properties achieving up to 99% and 100% reduction of colonies for both bacteria cultures after 24 h of incubation and 100% of reduction after 48 h of incubation. The cytotoxicity of Ag-Mg-HA was also in deep investigated assessing both cell proliferation and differentiation using hADSCs (human Adipose Derived Stem Cells) and testing data point at 0, 7, 14 and 24 days. The results show cytotoxic effect with cell proliferation decreasing up to 90% at 24 days and osteogenic differentiation inhibition. The observed cytotoxicity can be probable ascribed to the oxidative stress by ROS. Indeed, considering the effectiveness of the nanofunctionalization method and the excellent antibacterial properties showed by the Ag-Mg-HA scaffold, future works will be devoted to create nanofunctionalized scaffold satisfying both antimicrobial and osteo-regenerative properties.
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Affiliation(s)
| | - Salvatore Petralia
- Department of Drug Science Department, University of Catania, Catania, Italy
| | - Domenico Franco
- ChiBioFarAm Department, University of Messina, Messina, Italy
| | - Giuseppe Nocito
- ChiBioFarAm Department, University of Messina, Messina, Italy
| | | | - Lucia Forte
- Fin-Ceramica Faenza, 48018 Faenza, RA, Italy
| | | | - Stefano Squarzoni
- CNR - Institute of Molecular Genetics "Luigi Luca Cavalli-Sforza", Bologna, Italy; IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Francesco Traina
- IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy; Biomorf Department, University of Messina, Messina, Italy
| | - Sabrina Conoci
- ChiBioFarAm Department, University of Messina, Messina, Italy; Distretto Tecnologico Micro e Nano Sistemi Sicilia, Catania, Italy.
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16
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Sowa A, Voskuhl J. Host-guest complexes - Boosting the performance of photosensitizers. Int J Pharm 2020; 586:119595. [PMID: 32629069 DOI: 10.1016/j.ijpharm.2020.119595] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 06/26/2020] [Accepted: 06/27/2020] [Indexed: 12/20/2022]
Abstract
In this review, we will show the diversity of supramolecular host-guest complexes of cyclodextrins, cucurbit[n]urils, calix[n]- and pillar[n]arenes with photosensitizers, like porphyrins and phthalocyanines. Host-guest complexes are one of the main building blocks in supramolecular chemistry. For example, they have been widely used to encapsulate hydrophobic drug molecules to enhance the bioavailability in the human body. In these days of multiresistant bacteria and difficulties in cancer therapy, supramolecular host-guest systems with photosensitizers for the photodynamic therapy(PDT) gain more and more interest. In general, photosensitizers with a (large) conjugated aromatic π-system are used, which tend to π-πstacking in aqueous media suppressing the cell toxicity by singletoxygen production quenching. This can be overcome by the formation of host-guest complexes. Besides that, encapsulation of the photosensitizers in host molecules can enhance the solubility, increase cellular uptake, lead to hydrogels, rotaxanes, and switchable systems.
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Affiliation(s)
- Andrea Sowa
- Institute of Organic Chemistry, University of Duisburg-Essen, Universitätsstrasse 2, 45141 Essen, Germany
| | - Jens Voskuhl
- Institute of Organic Chemistry, University of Duisburg-Essen, Universitätsstrasse 2, 45141 Essen, Germany.
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