1
|
Gyuzeleva D, Batsalova T, Dzhambazov B, Teneva I, Mladenova T, Mladenov R, Stoyanov P, Todorov K, Moten D, Apostolova D, Bivolarska A. Assessment of the biological activity of Marrubium friwaldskyanum Boiss. ( Lamiaceae). Heliyon 2024; 10:e32599. [PMID: 38961917 PMCID: PMC11219964 DOI: 10.1016/j.heliyon.2024.e32599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 06/05/2024] [Accepted: 06/05/2024] [Indexed: 07/05/2024] Open
Abstract
Present scientific evidences about the biological activity and potential medical application of extracts derived from Marrubium friwaldskyanum Boiss. are limited. Therefore, our study was undertaken to define several main characteristics in this regard - in vitro cytotoxicity and antitumor properties, antibacterial activity and immunomodulatory potential. Extracts were obtained from different aerial parts of Marrubium friwaldskyanum - stems, leaves and flowers. The in vitro cytotoxicity and antitumor activity of the samples were evaluated by tetrazolium salt reduction tests and Neutral red uptake assays using four human cell lines (a normal fibroblastic and three adenocarcinoma cell lines/A549, HeLa, HT-29/) and by experiments with HT-29 tumor spheroids. Antibacterial activity toward Gram-negative (Escherichia coli) and Gram-positive (Bacillus cereus) species was assessed based on estimation of minimal inhibitory and minimal bactericidal concentrations as well as longitudinal studies on bacterial viability. Ex vivo assays with normal leukocytes were performed to define potential immunomodulatory activity of the extracts. Our results demonstrated selective antitumor activity of the extracts directed against colon adenocarcinoma HT-29 cells and cervical adenocarcinoma HeLa cell line. Metabolic activity of A549 lung adenocarcinoma cells was affected only by the sample derived from flowers. M. friwaldskyanum leaf and flower extracts showed the highest activity, which included reduction of HT-29 tumor spheroid growth and viability. The studied samples exhibited antibacterial activity against both bacterial species tested. Treatment with M. friwaldskyanum extracts affected specific leukocyte populations (HLA+, CD19+, CD11b+, CD25+ cells). These results demonstrate for the first time complex biological effects of extracts derived from M. friwaldskyanum and their potential to serve as a source of valuable compounds for the pharmaceutical industry.
Collapse
Affiliation(s)
- Donika Gyuzeleva
- Department of Botany and Biological Education, Faculty of Biology, University of Plovdiv “Paisii Hilendarski”, 4000, Plovdiv, Bulgaria
| | - Tsvetelina Batsalova
- Department of Developmental Biology, Faculty of Biology, University of Plovdiv “Paisii Hilendarski”, Plovdiv, 4000, Bulgaria
| | - Balik Dzhambazov
- Department of Developmental Biology, Faculty of Biology, University of Plovdiv “Paisii Hilendarski”, Plovdiv, 4000, Bulgaria
| | - Ivanka Teneva
- Department of Botany and Biological Education, Faculty of Biology, University of Plovdiv “Paisii Hilendarski”, 4000, Plovdiv, Bulgaria
| | - Tsvetelina Mladenova
- Department of Botany and Biological Education, Faculty of Biology, University of Plovdiv “Paisii Hilendarski”, 4000, Plovdiv, Bulgaria
| | - Rumen Mladenov
- Department of Botany and Biological Education, Faculty of Biology, University of Plovdiv “Paisii Hilendarski”, 4000, Plovdiv, Bulgaria
- Department of Bioorganic Chemistry, Faculty of Pharmacy, Medical University of Plovdiv, 4002, Plovdiv, Bulgaria
| | - Plamen Stoyanov
- Department of Botany and Biological Education, Faculty of Biology, University of Plovdiv “Paisii Hilendarski”, 4000, Plovdiv, Bulgaria
- Department of Bioorganic Chemistry, Faculty of Pharmacy, Medical University of Plovdiv, 4002, Plovdiv, Bulgaria
| | - Krasimir Todorov
- Department of Botany and Biological Education, Faculty of Biology, University of Plovdiv “Paisii Hilendarski”, 4000, Plovdiv, Bulgaria
| | - Dzhemal Moten
- Department of Developmental Biology, Faculty of Biology, University of Plovdiv “Paisii Hilendarski”, Plovdiv, 4000, Bulgaria
| | - Desislava Apostolova
- Department of Developmental Biology, Faculty of Biology, University of Plovdiv “Paisii Hilendarski”, Plovdiv, 4000, Bulgaria
| | - Anelia Bivolarska
- Department of Medical Biochemistry, Faculty of Pharmacy, Medical University of Plovdiv, 4002, Plovdiv, Bulgaria
| |
Collapse
|
2
|
Nyagumbo E, Pote W, Shopo B, Nyirenda T, Chagonda I, Mapaya RJ, Maunganidze F, Mavengere WN, Mawere C, Mutasa I, Kademeteme E, Maroyi A, Taderera T, Bhebhe M. Medicinal plants used for the management of respiratory diseases in Zimbabwe: Review and perspectives potential management of COVID-19. PHYSICS AND CHEMISTRY OF THE EARTH (2002) 2022; 128:103232. [PMID: 36161239 PMCID: PMC9489988 DOI: 10.1016/j.pce.2022.103232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 08/17/2022] [Accepted: 08/23/2022] [Indexed: 06/16/2023]
Abstract
Respiratory diseases have in the recent past become a health concern globally. More than 523 million cases of coronavirus disease (COVID19), a recent respiratory diseases have been reported, leaving more than 6 million deaths worldwide since the start of the pandemic. In Zimbabwe, respiratory infections have largely been managed using traditional (herbal) medicines, due to their low cost and ease of accessibility. This review highlights the plants' toxicological and pharmacological evaluation studies explored. It seeks to document plants that have been traditionally used in Zimbabwe to treat respiratory ailments within and beyond the past four decades. Extensive literature review based on published papers and abstracts retrieved from the online bibliographic databases, books, book chapters, scientific reports and theses available at Universities in Zimbabwe, were used in this study. From the study, there were at least 58 plant families comprising 160 medicinal plants widely distributed throughout the country. The Fabaceae family had the highest number of medicinal plant species, with a total of 21 species. A total of 12 respiratory ailments were reportedly treatable using the identified plants. From a total of 160 plants, colds were reportedly treatable with 56, pneumonia 53, coughs 34, chest pain and related conditions 29, asthma 25, tuberculosis and spots in lungs 22, unspecified respiratory conditions 20, influenza 13, bronchial problems 12, dyspnoea 7, sore throat and infections 5 and sinus clearing 1 plant. The study identified potential medicinal plants that can be utilised in future to manage respiratory infections.
Collapse
Affiliation(s)
- Elliot Nyagumbo
- Department of Biochemistry, Faculty of Medicine and Health Sciences, Midlands State University, Gweru, Zimbabwe
| | - William Pote
- Ethnobiology-based Drug discovery, Research and Development Trust, Gweru, Zimbabwe
- Department of Physiology, School of Medicine and Health Sciences, Great Zimbabwe University, Masvingo, Zimbabwe
| | - Bridgett Shopo
- Department of Applied Bioscience and Biotechnology, Faculty of Science and Technology, Midlands State University, Gweru, Zimbabwe
- Ethnobiology-based Drug discovery, Research and Development Trust, Gweru, Zimbabwe
| | - Trust Nyirenda
- Department of Physiology, Faculty of Medicine and Health Sciences, Midlands State University, Gweru, Zimbabwe
- Department of Anatomy and Physiology, Faculty of Medicine, National University of Science and Technology, Bulawayo, Zimbabwe
| | - Ignatius Chagonda
- Department of Agriculture Practice, Faculty of Agriculture, Midlands State University, Gweru, Zimbabwe
| | - Ruvimbo J Mapaya
- Department of Applied Bioscience and Biotechnology, Faculty of Science and Technology, Midlands State University, Gweru, Zimbabwe
| | - Fabian Maunganidze
- Ethnobiology-based Drug discovery, Research and Development Trust, Gweru, Zimbabwe
- Department of Physiology, Faculty of Medicine and Health Sciences, Midlands State University, Gweru, Zimbabwe
| | - William N Mavengere
- Ethnobiology-based Drug discovery, Research and Development Trust, Gweru, Zimbabwe
- Department of Biotechnology, School of Industrial Sciences and Technology, Harare Institute of Technology, Harare, Zimbabwe
| | - Cephas Mawere
- Department of Biotechnology, School of Industrial Sciences and Technology, Harare Institute of Technology, Harare, Zimbabwe
| | - Ian Mutasa
- Ethnobiology-based Drug discovery, Research and Development Trust, Gweru, Zimbabwe
- Department of Physiology, School of Medicine and Health Sciences, Great Zimbabwe University, Masvingo, Zimbabwe
| | - Emmanuel Kademeteme
- Department of Physiology, School of Medicine and Health Sciences, Great Zimbabwe University, Masvingo, Zimbabwe
| | - Alfred Maroyi
- Department of Botany, University of Fort Hare, Alice, South Africa
| | - Tafadzwa Taderera
- Department of Biomedical Sciences, Physiology Unit, University of Zimbabwe, P.O. Box MP167, Mt Pleasant, Harare, Zimbabwe
| | - Michael Bhebhe
- Department of Biochemistry, Faculty of Medicine and Health Sciences, Midlands State University, Gweru, Zimbabwe
- Ethnobiology-based Drug discovery, Research and Development Trust, Gweru, Zimbabwe
| |
Collapse
|
3
|
Silver-Doped Anodic Alumina with Antimicrobial Properties—Synthesis and Characterization. METALS 2022. [DOI: 10.3390/met12030474] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The incessant need for the elimination of pathogenic viruses and multi-drug resistant bacteria has been a critical issue during recent decades, and requires the creation of new antimicrobial materials. Our study describes the production of silver-modified anodic alumina substrates by two methods, and estimation of their bactericidal activity. Aluminum oxide coatings were obtained via an anodization process of low-purity aluminum in an acidic bath for different time periods. The realization of silver infiltration into the pores of the alumina layers was carried out employing two different routes—electrochemical deposition, and in situ thermal reduction. The obtained films were characterized using scanning electron microscopy (SEM). Changes in the surface morphology and thickness of the initial oxide structures after hot water sealing procedure were observed. The presence of silver inside the pores of the alumina layers was also assessed. It was found that silver electrodeposition resulted in greater surface saturation. Large silver accumulations were observed on the thinner anodic films which experienced electroplating for longer time periods. Finally, the antibacterial activity of the modified alumina structures against Gram-negative (Escherichia coli) and Gram-positive (Bacillus cereus) bacteria was evaluated. The results demonstrate that silver deposits acquired by the electrochemical technique improve the bactericidal efficiency of the anodic aluminum oxide (AAO) layers. On the contrary, alumina structures with chemically embedded Ag particles did not show significant antibacterial properties. Overall, the present studies demonstrate that biological activity of silver-doped AAO films depends on the techniques used for their modification.
Collapse
|
4
|
Abass S, Parveen R, Irfan M, Jan B, Husain SA, Ahmad S. Synergy based extracts of medicinal plants: Future antimicrobials to combat multidrug resistance. Curr Pharm Biotechnol 2022; 23:1527-1540. [PMID: 35081888 DOI: 10.2174/1389201023666220126115656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 12/17/2021] [Accepted: 12/28/2021] [Indexed: 11/22/2022]
Abstract
The use of herbal medicines and supplements in the last thirty years has increased enormously. Herbal medication has demonstrated promising and effective potential against various diseases. Herbal and phytoconstituent medications are gaining popularity globally and many people are adopting herbal remedies to deal with different health issues. The indiscriminate use of antibiotics, due to the development of antimicrobial resistance, poses an unprecedented problem for human civilization. Bacterial infections are difficult to cure because of the propensity of microbes to acquire resistance to a wide range of antimicrobial drugs. New compounds are being explored and quantified for possible antibacterial activity with little or no side effects. Researchers are investigating the range of therapeutic plants mentioned in Unani, Ayurveda, and Siddha around the globe. Known and commonly acclaimed global databases such as PubMed, Research Gate, Science Direct, Google Scholar, were searched using different search strings such as Indian medicinal plants, multidrug resistance (MDR), thin layer chromatography (TLC), antimicrobials, and Synergism were used in diverse combinations to reclaim numerous citations associated with this area. Thus, the current review aims to shed a light on the information of medicinal plants as a potential foundation of herbal drugs and elucidate how synergism and TLC bioautography plays a crucial role in finding antimicrobial compounds.
Collapse
Affiliation(s)
- Sageer Abass
- Department of Biotechnology, Jamia Millia Islamia, New Delhi 110025, India
- Bioactive Natural Product Laboratory, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
- Department of Biosciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Rabea Parveen
- Bioactive Natural Product Laboratory, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
- Department of Biosciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Mohammad Irfan
- Department of Biotechnology, Jamia Millia Islamia, New Delhi 110025, India
- Bioactive Natural Product Laboratory, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Bisma Jan
- Bioactive Natural Product Laboratory, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Syed Akhtar Husain
- Department of Biosciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Sayeed Ahmad
- Bioactive Natural Product Laboratory, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| |
Collapse
|
5
|
Antibacterial, Antifungal, and Antidiabetic Effects of Leaf Extracts from Persea americana Mill. (Lauraceae). Biochem Res Int 2020. [DOI: 10.1155/2020/8884300] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Fruits and leaves of Persia americana are used in traditional medical practices. This study was carried out to determine the antibacterial, antifungal, and antidiabetic effects of the leaf extracts from P. americana. The antibacterial activities of the leaf extracts were evaluated against Klebsiella pneumoniae and Staphylococcus epidermidis while antifungal activities were determined against Candida albicans and Candida tropicalis. The antidiabetic potential of the extracts was determined against mammalian α-glucosidase in vitro. The broth microdilution method was used to investigate the antibacterial and antifungal susceptibility of the microbial strains towards the leaf extracts. S. epidermidis was the most susceptible microbe out of the tested microorganisms. The acetone extract was the most potent extract against S. epidermidis with a minimum inhibitory concentration (MIC) of 50 μg/mL. At 100 μg/mL, the ethanol:water extract 18% of K. pneumoniae cells remained viable. Cell viability after exposure to the dichloromethane (DCM) and methanol extracts was 28% against C. albicans and 8% against C. tropicalis, respectively. The DCM:methanol and acetone extracts caused membrane damage in S. epidermidis exhibited by protein leakage. Only the acetone extract effected nucleic acid leakage. Screening of extracts’ potential to inhibit the activity of α-glucosidase was carried out spectrophotometrically following the production of p-nitrophenol from p-nitrophenol-glucopyranoside (substrate) at a wavelength of 405 nm. Out of all the tested extracts, the methanolic extract showed the best inhibitory activity on α-glucosidase enzyme in a time-dependent and dose-dependent manner.andvalues were found to be 1.4 mg/mL and 2.4 U/min, respectively, after incubation for 1 hour. It was concluded that the leaf extracts of P. americana contain phytochemicals with antibacterial, antifungal, and α-glucosidase inhibitory effects. Further studies are required for the identification of the active compounds in the leaf extracts responsible for these observed effects.
Collapse
|
6
|
Repurposing of Drugs for Antibacterial Activities on Selected ESKAPE Bacteria Staphylococcus aureus and Pseudomonas aeruginosa. Int J Microbiol 2020; 2020:8885338. [PMID: 33061985 PMCID: PMC7542517 DOI: 10.1155/2020/8885338] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Accepted: 09/15/2020] [Indexed: 12/18/2022] Open
Abstract
Increasing cases of multidrug-resistant pathogens have evolved into a global health crisis. ESKAPE group of bacteria are associated with antibiotic resistance, and infections caused by these pathogens result in high mortality and morbidity. However, de novo synthesis of antibiotics is expensive and time-consuming since the development of a new drug has to go through several clinical trials. Repurposing of old drugs for the treatment of antimicrobial resistant pathogens has been explored as an alternative strategy in the field of antimicrobial drug discovery. Ten non-antimicrobial compounds were screened for antibacterial activity on two ESKAPE organisms, Staphylococcus aureus and Pseudomonas aeruginosa. The drugs used in this study were amodiaquine an antimalarial drug, probenecid used to prevent gout, ibuprofen a painkiller, 2-amino-5-chlorobenzaxazole used as a tool for assessing hepatic cytochrome P450 activity in rodents, ellargic acid an antioxidant, quercetin an antioxidant and anti-inflammatory drug, N–N diacryloylpiperazine used to crosslink polyacrylamide gel in 2D-protein electrophoresis, epicatechin an antioxidant and antiviral drug, curcumin an anticancer drug, and quinine an antimalarial drug. Antibacterial susceptibility tests were carried out for the 10 compounds. Curcumin exhibited the most potent antimicrobial activity against both bacteria, with MICs of 50 μg/ml and 100 μg/ml for P. aeruginosa and S. aureus, respectively. Ellargic acid was found to have an MIC of 100 μg/ml against S. aureus. Curcumin caused protein and nucleic acid leakage from the bacterial cell membrane in both bacterial species. When curcumin was combined with ciprofloxacin, it was found to enhance the antibacterial effects of ciprofloxacin. The combination with ciprofloxacin reduced the MIC for ciprofloxacin from 0.5 μg/ml to 0.0625 μg/ml on P. aeruginosa and 0.25 μg/ml to 0.0625 μg/ml on S. aureus. The results obtained show that curcumin has antibacterial activity against S. aureus and P. aeruginosa and may enhance the antibacterial activity of ciprofloxacin.
Collapse
|
7
|
Nocedo-Mena D, Garza-González E, González-Ferrara M, del Rayo Camacho-Corona M. Antibacterial Activity of Cissus incisa Extracts against Multidrug- Resistant Bacteria. Curr Top Med Chem 2020; 20:318-323. [DOI: 10.2174/1568026619666191121123926] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 05/25/2019] [Accepted: 06/15/2019] [Indexed: 12/16/2022]
Abstract
Aims:
The need to find new antimicrobial agents to cope with this phenomenon increases.
Background:
Infection diseases are illness caused by different microorganisms, such as bacteria, among
those caused by resistant bacteria are associated with greater morbidity, mortality and cost of the treatment
than those caused by sensitive bacteria of the same species.
Objective:
Need to find new antimicrobial agents to cope with this phenomenon increases.
Method:
This work carried out the study of biological activities of Cissus incisa, taking account its traditional
use. Three extracts were prepared from the leaves of this plant: hexane, chloroform methanol
(1:1) and aqueous. Their antibacterial and antitubercular activities were evaluated using microdilution
and alamar blue assays; respectively.
Result:
The chloroform/methanol extract (1:1) was the most active of the three tested extracts for antimicrobial
activity. In this way, the extract exhibits a broad spectrum of antimicrobial activity, against
the Gram positive and Gram negative bacteria tested, with MIC values between 125 to 500 μg/mL.
Conclusion:
This research contributes both to the knowledge of the Mexican flora, as well as the discovery
of potential antibacterial agents derivate from plants.
Collapse
Affiliation(s)
- Deyani Nocedo-Mena
- Faculty of Chemical Sciences, Autonomous University of Nuevo Leon, Av. Universidad S/N, Ciudad Universitaria, CP 66451, San Nicolas de los Garza, Nuevo Leon, Mexico
| | - Elvira Garza-González
- Autonomous University of Nuevo Leon, Gastroenterology Service, University Hospital Dr. Jose Eleuterio Gonzalez. Av. Gonzalitos y Madero S/N, Colonia Mitras Centro, CP 64460, Monterrey, Nuevo Leon, Mexico
| | | | - María del Rayo Camacho-Corona
- Faculty of Chemical Sciences, Autonomous University of Nuevo Leon, Av. Universidad S/N, Ciudad Universitaria, CP 66451, San Nicolas de los Garza, Nuevo Leon, Mexico
| |
Collapse
|
8
|
Mombeshora M, Mukanganyama S. Antibacterial activities, proposed mode of action and cytotoxicity of leaf extracts from Triumfetta welwitschii against Pseudomonas aeruginosa. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2019; 19:315. [PMID: 31744500 PMCID: PMC6862819 DOI: 10.1186/s12906-019-2713-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Accepted: 10/11/2019] [Indexed: 11/23/2022]
Abstract
BACKGROUND Pseudomonas aeruginosa has become a main cause of Gram-negative infection, particularly in patients with compromised immunity. High rates of resistance to antibiotics are associated with nosocomial infections caused by P. aeruginosa strains. The search for novel antimicrobials has been necessitated by the emergence of antimicrobial resistance in some bacteria Plant-based antimicrobials has great potential to combat microbial infections using a variety of mechanisms. Triumfetta welwitschii plant roots are traditionally used to treat symptoms of diarrhoea and fever, suggesting that it possess antimicrobial and immunomodulatory effects. Since research investigating antimicrobial properties of the roots of Triumfetta welwitschii has been explored, there is need to investigate the antimicrobial activity of its leaf extracts in order to probe their prospective use as new antimicrobial agents that can be used to combat nosocomial infections. The objective of this study was to evaluate the antibacterial activities, the mode of action and cytotoxicity of T. welwitschii leaf extracts. METHOD Extracts of T. welwitschii leaves were obtained using eight different solvents, the serial exhaustive extraction method and the cold maceration technique. In vitro antibacterial activity evaluation of the extracts was done on eight bacterial isolates using the broth microdilution method. The mode of action for the most potent extracts was investigated using the rhodamine 6G efflux assay and the propidium iodide-based membrane damage assay. Toxicity of the extracts was evaluated using the haemolytic and MTT (3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide) assays. RESULTS The results showed that acetone, ethanol and dichlorometane: methanol extracts had the most potent antibacterial activities against Pseudomonas aeruginosa (ATCC 27853). All three extracts caused membrane disruption of P. aeruginosa as shown by nucleic acid leakage. All three extracts were unable to inhibit efflux pumps. CONCLUSION The presence of antibacterial activities and low toxicity shown by the extracts indicates that the plant may be a source of effective antibacterial against some bacterial infections caused by P. aeruginosa. The disruption of membrane integrity is one possible mode of action of antibacterial activity of the potent extracts.
Collapse
Affiliation(s)
- Molly Mombeshora
- Biomolecular Interactions Analyses Group, Department of Biochemistry, University of Zimbabwe, P.O. Box MP 167, Mount Pleasant, Harare, Zimbabwe
| | - Stanley Mukanganyama
- Biomolecular Interactions Analyses Group, Department of Biochemistry, University of Zimbabwe, P.O. Box MP 167, Mount Pleasant, Harare, Zimbabwe.
| |
Collapse
|
9
|
Bao Y, Zhang H, Huang X, Ma J, Logue CM, Nolan LK, Li G. O-specific polysaccharide confers lysozyme resistance to extraintestinal pathogenic Escherichia coli. Virulence 2018; 9:666-680. [PMID: 29405825 PMCID: PMC5955474 DOI: 10.1080/21505594.2018.1433979] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Extraintestinal pathogenic Escherichia coli (ExPEC) is the leading cause of bloodstream and other extraintestinal infections in human and animals. The greatest challenge encountered by ExPEC during an infection is posed by the host defense mechanisms, including lysozyme. ExPEC have developed diverse strategies to overcome this challenge. The aim of this study was to characterize the molecular mechanism of ExPEC resistance to lysozyme. For this, 15,000 transposon mutants of a lysozyme-resistant ExPEC strain NMEC38 were screened; 20 genes were identified as involved in ExPEC resistance to lysozyme—of which five were located in the gene cluster between galF and gnd, and were further confirmed to be involved in O-specific polysaccharide biosynthesis. The O-specific polysaccharide was able to inhibit the hydrolytic activity of lysozyme; it was also required by the complete lipopolysaccharide (LPS)-mediated protection of ExPEC against the bactericidal activity of lysozyme. The O-specific polysaccharide was further shown to be able to directly interact with lysozyme. Furthermore, LPS from ExPEC strains of different O serotypes was also able to inhibit the hydrolytic activity of lysozyme. Because of their cell surface localization and wide distribution in Gram-negative bacteria, O-specific polysaccharides appear to play a long-overlooked role in protecting bacteria against exogenous lysozyme.
Collapse
Affiliation(s)
- Yinli Bao
- a Department of Veterinary Diagnostic and Production Animal Medicine , College of Veterinary Medicine, Iowa State University , Ames , IA , USA.,b Department of Veterinary Preventive Medicine , College of Veterinary Medicine, Nanjing Agricultural University , Nanjing , China
| | - Haobo Zhang
- b Department of Veterinary Preventive Medicine , College of Veterinary Medicine, Nanjing Agricultural University , Nanjing , China
| | - Xinxin Huang
- c Shanghai Entry-Exit Inspection and Quarantine Bureau , Shanghai , China
| | - Jiale Ma
- a Department of Veterinary Diagnostic and Production Animal Medicine , College of Veterinary Medicine, Iowa State University , Ames , IA , USA.,b Department of Veterinary Preventive Medicine , College of Veterinary Medicine, Nanjing Agricultural University , Nanjing , China
| | - Catherine M Logue
- d Department of Veterinary Microbiology and Preventive Medicine , College of Veterinary Medicine, Iowa State University , Ames , IA , USA
| | - Lisa K Nolan
- d Department of Veterinary Microbiology and Preventive Medicine , College of Veterinary Medicine, Iowa State University , Ames , IA , USA
| | - Ganwu Li
- a Department of Veterinary Diagnostic and Production Animal Medicine , College of Veterinary Medicine, Iowa State University , Ames , IA , USA.,e State Key Laboratory of Veterinary Biotechnology , Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences , Harbin , China
| |
Collapse
|