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Koh CMM, Ping LSY, Xuan CHH, Theng LB, San HS, Palombo EA, Wezen XC. A data-driven machine learning approach for discovering potent LasR inhibitors. Bioengineered 2023; 14:2243416. [PMID: 37552115 PMCID: PMC10411317 DOI: 10.1080/21655979.2023.2243416] [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: 03/10/2023] [Revised: 07/26/2023] [Accepted: 07/28/2023] [Indexed: 08/09/2023] Open
Abstract
The rampant spread of multidrug-resistant Pseudomonas aeruginosa strains severely threatens global health. This severity is compounded against the backdrop of a stagnating antibiotics development pipeline. Moreover, with many promising therapeutics falling short of expectations in clinical trials, targeting the las quorum sensing (QS) system remains an attractive therapeutic strategy to combat P. aeruginosa infection. Thus, our primary goal was to develop a drug prediction algorithm using machine learning to identify potent LasR inhibitors. In this work, we demonstrated using a Multilayer Perceptron (MLP) algorithm boosted with AdaBoostM1 to discriminate between active and inactive LasR inhibitors. The optimal model performance was evaluated using 5-fold cross-validation and test sets. Our best model achieved a 90.7% accuracy in distinguishing active from inactive LasR inhibitors, an area under the Receiver Operating Characteristic Curve value of 0.95, and a Matthews correlation coefficient value of 0.81 when evaluated using test sets. Subsequently, we deployed the model against the Enamine database. The top-ranked compounds were further evaluated for their target engagement activity using molecular docking studies, Molecular Dynamics simulations, MM-GBSA analysis, and Free Energy Landscape analysis. Our data indicate that several of our chosen top hits showed better ligand-binding affinities than naringenin, a competitive LasR inhibitor. Among the six top hits, five of these compounds were predicted to be LasR inhibitors that could be used to treat P. aeruginosa-associated infections. To our knowledge, this study provides the first assessment of using an MLP-based QSAR model for discovering potent LasR inhibitors to attenuate P. aeruginosa infections.
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Affiliation(s)
- Christabel Ming Ming Koh
- Faculty of Engineering, Computing, and Science, Swinburne University of Technology, Sarawak, Malaysia
| | - Lilian Siaw Yung Ping
- Faculty of Engineering, Computing, and Science, Swinburne University of Technology, Sarawak, Malaysia
| | - Christopher Ha Heng Xuan
- Faculty of Engineering, Computing, and Science, Swinburne University of Technology, Sarawak, Malaysia
| | - Lau Bee Theng
- Faculty of Engineering, Computing, and Science, Swinburne University of Technology, Sarawak, Malaysia
| | - Hwang Siaw San
- Faculty of Engineering, Computing, and Science, Swinburne University of Technology, Sarawak, Malaysia
| | - Enzo A. Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Xavier Chee Wezen
- Faculty of Engineering, Computing, and Science, Swinburne University of Technology, Sarawak, Malaysia
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Bosnjak M, Karpe AV, Van TTH, Kotsanas D, Jenkin GA, Costello SP, Johanesen P, Moore RJ, Beale DJ, Srikhanta YN, Palombo EA, Larcombe S, Lyras D. Multi-omics analysis of hospital-acquired diarrhoeal patients reveals biomarkers of enterococcal proliferation and Clostridioides difficile infection. Nat Commun 2023; 14:7737. [PMID: 38007555 PMCID: PMC10676382 DOI: 10.1038/s41467-023-43671-8] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Accepted: 11/16/2023] [Indexed: 11/27/2023] Open
Abstract
Hospital-acquired diarrhoea (HAD) is common, and often associated with gut microbiota and metabolome dysbiosis following antibiotic administration. Clostridioides difficile is the most significant antibiotic-associated diarrhoeal (AAD) pathogen, but less is known about the microbiota and metabolome associated with AAD and C. difficile infection (CDI) with contrasting antibiotic treatment. We characterised faecal microbiota and metabolome for 169 HAD patients (33 with CDI and 133 non-CDI) to determine dysbiosis biomarkers and gain insights into metabolic strategies C. difficile might use for gut colonisation. The specimen microbial community was analysed using 16 S rRNA gene amplicon sequencing, coupled with untargeted metabolite profiling using gas chromatography-mass spectrometry (GC-MS), and short-chain fatty acid (SCFA) profiling using GC-MS. AAD and CDI patients were associated with a spectrum of dysbiosis reflecting non-antibiotic, short-term, and extended-antibiotic treatment. Notably, extended antibiotic treatment was associated with enterococcal proliferation (mostly vancomycin-resistant Enterococcus faecium) coupled with putative biomarkers of enterococcal tyrosine decarboxylation. We also uncovered unrecognised metabolome dynamics associated with concomitant enterococcal proliferation and CDI, including biomarkers of Stickland fermentation and amino acid competition that could distinguish CDI from non-CDI patients. Here we show, candidate metabolic biomarkers for diagnostic development with possible implications for CDI and vancomycin-resistant enterococci (VRE) treatment.
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Affiliation(s)
- Marijana Bosnjak
- Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, Victoria, Australia
| | - Avinash V Karpe
- Environment, Commonwealth Scientific and Industrial Research Organisation, Ecosciences Precinct, Dutton Park, Queensland, Australia
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Victoria, Australia
- Agriculture and Food, Commonwealth Scientific and Industrial Research Organisation, Acton, ACT, Australia
| | - Thi Thu Hao Van
- School of Science, RMIT University, Bundoora, Victoria, Australia
| | - Despina Kotsanas
- Agriculture and Food, Commonwealth Scientific and Industrial Research Organisation, Acton, ACT, Australia
| | - Grant A Jenkin
- Department of Infectious Diseases, Monash Health, Clayton, Victoria, Australia
| | - Samuel P Costello
- Department of Gastroenterology, The Queen Elizabeth Hospital, Woodville South, South Australia, Australia
| | - Priscilla Johanesen
- Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, Victoria, Australia
| | - Robert J Moore
- School of Science, RMIT University, Bundoora, Victoria, Australia
| | - David J Beale
- Environment, Commonwealth Scientific and Industrial Research Organisation, Ecosciences Precinct, Dutton Park, Queensland, Australia
| | - Yogitha N Srikhanta
- Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, Victoria, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Sarah Larcombe
- Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, Victoria, Australia
| | - Dena Lyras
- Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, Victoria, Australia.
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Kuek M, McLean SK, Palombo EA. Control of Escherichia coli in Fresh-Cut Mixed Vegetables Using a Combination of Bacteriophage and Carvacrol. Antibiotics (Basel) 2023; 12:1579. [PMID: 37998781 PMCID: PMC10668671 DOI: 10.3390/antibiotics12111579] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 10/20/2023] [Accepted: 10/28/2023] [Indexed: 11/25/2023] Open
Abstract
The continual emergence of antibiotic-resistant bacteria and the slow development of new antibiotics has driven the resurgent interest in the potential application of bacteriophages as antimicrobial agents in different medical and industrial sectors. In the present study, the potential of combining phage biocontrol and a natural plant compound (carvacrol) in controlling Escherichia coli on fresh-cut mixed vegetable was evaluated. Four coliphages, designated Escherichia phage SUT_E420, Escherichia phage SUT_E520, Escherichia phage SUT_E1520 and Escherichia phage SUT_E1620, were isolated from raw sewage. Biological characterization revealed that all four phages had a latent period of 20-30 min and a burst size ranging from 116 plaque-forming units (PFU)/colony forming units (CFU) to 441 PFU/CFU. The phages effectively inhibited the growth of respective host bacteria in vitro, especially when used at a high multiplicity of infection (MOI). Based on transmission electron microscopy analysis, all phages were classified as tailed phages in the class of Caudoviricetes. Additionally, next generation sequencing indicated that none of the selected coliphages contained genes encoding virulence or antimicrobial resistance factors, highlighting the suitability of isolated phages as biocontrol agents. When a phage cocktail (~109 PFU/mL) was applied alone onto fresh-cut mixed vegetables artificially contaminated with E. coli, no bacteria were recovered from treated samples on Day 0, followed by a gradual increase in the E. coli population after 24 h of incubation at 8 °C. On the other hand, no significant differences (p < 0.05) were observed between treated and non-treated samples in terms of E. coli viable counts when carvacrol at the minimum inhibitory concentration (MIC) of 6.25 μL/mL was applied alone. When a phage cocktail at an MOI of ~1000 and MIC carvacrol were applied in combination, no E. coli were recovered from treated samples on Day 0 and 1, followed by a slight increase in the E. coli population to approximately 1.2-1.3 log CFU/mL after 48 h of incubation at 8 °C. However, total elimination of E. coli was observed in samples treated with a phage cocktail at a higher MOI of ~2000 and carvacrol at MIC, with a reduction of approximately 4 log CFU/mL observed at the end of Day 3. The results obtained in this study highlight the potential of combined treatment involving phage biocontrol and carvacrol as a new alternative method to reduce E. coli contamination in minimally processed ready-to-eat foods.
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Affiliation(s)
- Maryanne Kuek
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia; (S.K.M.); (E.A.P.)
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Haldar S, Jadhav SR, Gulati V, Beale DJ, Balkrishna A, Varshney A, Palombo EA, Karpe AV, Shah RM. Unravelling the gut-lung axis: insights into microbiome interactions and Traditional Indian Medicine's perspective on optimal health. FEMS Microbiol Ecol 2023; 99:fiad103. [PMID: 37656879 PMCID: PMC10508358 DOI: 10.1093/femsec/fiad103] [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: 01/16/2023] [Revised: 07/05/2023] [Accepted: 08/30/2023] [Indexed: 09/03/2023] Open
Abstract
The microbiome of the human gut is a complex assemblage of microorganisms that are in a symbiotic relationship with one another and profoundly influence every aspect of human health. According to converging evidence, the human gut is a nodal point for the physiological performance matrixes of the vital organs on several axes (i.e. gut-brain, gut-lung, etc). As a result of COVID-19, the importance of gut-lung dysbiosis (balance or imbalance) has been realised. In view of this, it is of utmost importance to develop a comprehensive understanding of the microbiome, as well as its dysbiosis. In this review, we provide an overview of the gut-lung axial microbiome and its importance in maintaining optimal health. Human populations have successfully adapted to geophysical conditions through traditional dietary practices from around the world. In this context, a section has been devoted to the traditional Indian system of medicine and its theories and practices regarding the maintenance of optimally customized gut health.
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Affiliation(s)
- Swati Haldar
- Drug Discovery and Development Division, Patanjali Research Institute, NH-58, Haridwar 249405, Uttarakhand, India
| | - Snehal R Jadhav
- Consumer-Analytical-Safety-Sensory (CASS) Food Research Centre, School of Exercise and Nutrition Sciences, Deakin University, Burwood, VIC 3125, Australia
| | - Vandana Gulati
- Biomedical Science, School of Science and Technology Faculty of Science, Agriculture, Business and Law, University of New England, Armidale, NSW 2351, Australia
| | - David J Beale
- Environment, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Ecosciences Precinct, Dutton Park, QLD 4102, Australia
| | - Acharya Balkrishna
- Drug Discovery and Development Division, Patanjali Research Institute, NH-58, Haridwar 249405, Uttarakhand, India
- Department of Allied and Applied Sciences, University of Patanjali, Patanjali Yog Peeth, Roorkee-Haridwar Road, Haridwar 249405, Uttarakhand, India
| | - Anurag Varshney
- Drug Discovery and Development Division, Patanjali Research Institute, NH-58, Haridwar 249405, Uttarakhand, India
- Department of Allied and Applied Sciences, University of Patanjali, Patanjali Yog Peeth, Roorkee-Haridwar Road, Haridwar 249405, Uttarakhand, India
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Avinash V Karpe
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
- Socio-Eternal Thinking for Unity (SETU), Melbourne, VIC 3805, Australia
- Agriculture and Food, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Acton, ACT 2601, Australia
| | - Rohan M Shah
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
- School of Health and Biomedical Sciences, STEM College, RMIT University, Bundoora West, VIC 3083, Australia
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Caruso DJ, Palombo EA, Moulton SE, Duggan PJ, Zaferanloo B. Antibacterial and Antibiofilm Activity of Endophytic Alternaria sp. Isolated from Eremophila longifolia. Antibiotics (Basel) 2023; 12:1459. [PMID: 37760755 PMCID: PMC10525891 DOI: 10.3390/antibiotics12091459] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 09/16/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023] Open
Abstract
The threat to public health resulting from the emergence of antimicrobial resistance (AMR) is ever rising. One of the major bacterial pathogens at the forefront of this problem is methicillin-resistant Staphylococcus aureus, or MRSA, for which there is a great need to find alternative treatments. One of the most promising alternatives is endophytic fungi, which were shown to produce a vast array of bioactive compounds, including many novel antibacterial compounds. In this study, two endophytic Alternaria sp., EL 24 and EL 35, were identified from the leaves of Eremophila longifolia. Ethyl acetate (EtOAc) extracts of their culture filtrates were found to inhibit both methicillin-sensitive S. aureus ATCC 25923 and MRSA strains M173525 and M180920. The activity of each extract was shown to be greatly affected by the growth medium, with considerable reductions in minimum inhibitory concentrations (MICs) and minimum bactericidal concentrations (MBCs) observed when tested in tryptic soy broth with glucose (TSBG) compared with Mueller-Hinton broth (MHB). Both extracts displayed significant (p ≤ 0.05) antibiofilm activity against all three S. aureus strains, the greatest of which was that of EL 35, which reduced biofilm formation by M180920 by 72%, while that of EL 24 resulted in a 57% reduction against ATCC 25923. Both extracts also disrupted established biofilms, of which the most effective was EL 35, which reduced the M180920 biofilm by 64%, while EL 24 also performed best against M180920, reducing biofilm by 54%. Gas chromatography-mass spectrometry (GC-MS) analysis of the EL 24 EtOAc extract revealed five known compounds. This study highlights the promise of endophytic fungi from Australian plants as a potential source of substances effective against important bacterial pathogens. Further understanding of the responsible compounds and their mechanisms could lead to the development of treatments effective against MRSA, as well as novel biofilm-resistant biomedical materials, contributing towards reducing the burden of AMR.
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Affiliation(s)
- Daniel J Caruso
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Simon E Moulton
- Department of Engineering Technologies, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Peter J Duggan
- CSIRO Manufacturing, Research Way, Clayton, VIC 3168, Australia
- College of Science and Engineering, Flinders University, Adelaide, SA 5042, Australia
| | - Bita Zaferanloo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
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Watts D, Palombo EA, Jaimes Castillo A, Zaferanloo B. Endophytes in Agriculture: Potential to Improve Yields and Tolerances of Agricultural Crops. Microorganisms 2023; 11:1276. [PMID: 37317250 DOI: 10.3390/microorganisms11051276] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [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: 04/10/2023] [Revised: 05/08/2023] [Accepted: 05/10/2023] [Indexed: 06/16/2023] Open
Abstract
Endophytic fungi and bacteria live asymptomatically within plant tissues. In recent decades, research on endophytes has revealed that their significant role in promoting plants as endophytes has been shown to enhance nutrient uptake, stress tolerance, and disease resistance in the host plants, resulting in improved crop yields. Evidence shows that endophytes can provide improved tolerances to salinity, moisture, and drought conditions, highlighting the capacity to farm them in marginal land with the use of endophyte-based strategies. Furthermore, endophytes offer a sustainable alternative to traditional agricultural practices, reducing the need for synthetic fertilizers and pesticides, and in turn reducing the risks associated with chemical treatments. In this review, we summarise the current knowledge on endophytes in agriculture, highlighting their potential as a sustainable solution for improving crop productivity and general plant health. This review outlines key nutrient, environmental, and biotic stressors, providing examples of endophytes mitigating the effects of stress. We also discuss the challenges associated with the use of endophytes in agriculture and the need for further research to fully realise their potential.
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Affiliation(s)
- Declan Watts
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Alex Jaimes Castillo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Bita Zaferanloo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
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Karpe AV, Hutton ML, Mileto SJ, James ML, Evans C, Ghodke AB, Shah RM, Metcalfe SS, Liu JW, Walsh T, Lyras D, Palombo EA, Beale DJ. Gut Microbial Perturbation and Host Response Induce Redox Pathway Upregulation along the Gut-Liver Axis during Giardiasis in C57BL/6J Mouse Model. Int J Mol Sci 2023; 24:ijms24021636. [PMID: 36675151 PMCID: PMC9862352 DOI: 10.3390/ijms24021636] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/10/2023] [Accepted: 01/10/2023] [Indexed: 01/18/2023] Open
Abstract
Apicomplexan infections, such as giardiasis and cryptosporidiosis, negatively impact a considerable proportion of human and commercial livestock populations. Despite this, the molecular mechanisms of disease, particularly the effect on the body beyond the gastrointestinal tract, are still poorly understood. To highlight host-parasite-microbiome biochemical interactions, we utilised integrated metabolomics-16S rRNA genomics and metabolomics-proteomics approaches in a C57BL/6J mouse model of giardiasis and compared these to Cryptosporidium and uropathogenic Escherichia coli (UPEC) infections. Comprehensive samples (faeces, blood, liver, and luminal contents from duodenum, jejunum, ileum, caecum and colon) were collected 10 days post infection and subjected to proteome and metabolome analysis by liquid and gas chromatography-mass spectrometry, respectively. Microbial populations in faeces and luminal washes were examined using 16S rRNA metagenomics. Proteome-metabolome analyses indicated that 12 and 16 key pathways were significantly altered in the gut and liver, respectively, during giardiasis with respect to other infections. Energy pathways including glycolysis and supporting pathways of glyoxylate and dicarboxylate metabolism, and the redox pathway of glutathione metabolism, were upregulated in small intestinal luminal contents and the liver during giardiasis. Metabolomics-16S rRNA genetics integration indicated that populations of three bacterial families-Autopobiaceae (Up), Desulfovibrionaceae (Up), and Akkermanasiaceae (Down)-were most significantly affected across the gut during giardiasis, causing upregulated glycolysis and short-chained fatty acid (SCFA) metabolism. In particular, the perturbed Akkermanasiaceae population seemed to cause oxidative stress responses along the gut-liver axis. Overall, the systems biology approach applied in this study highlighted that the effects of host-parasite-microbiome biochemical interactions extended beyond the gut ecosystem to the gut-liver axis. These findings form the first steps in a comprehensive comparison to ascertain the major molecular and biochemical contributors of host-parasite interactions and contribute towards the development of biomarker discovery and precision health solutions for apicomplexan infections.
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Affiliation(s)
- Avinash V. Karpe
- Environment, Commonwealth Scientific and Industrial Research Organization, Ecosciences Precinct, Dutton Park, QLD 4102, Australia
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Melanie L. Hutton
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3168, Australia
| | - Steven J. Mileto
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3168, Australia
| | - Meagan L. James
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3168, Australia
| | - Chris Evans
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3168, Australia
| | - Amol B. Ghodke
- Health and Biosecurity, Commonwealth Scientific and Industrial Research Organization, Ecosciences Precinct, Dutton Park, QLD 4102, Australia
- Department of Horticulture, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Rohan M. Shah
- Environment, Commonwealth Scientific and Industrial Research Organization, Ecosciences Precinct, Dutton Park, QLD 4102, Australia
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Suzanne S. Metcalfe
- Environment, Commonwealth Scientific and Industrial Research Organization, Ecosciences Precinct, Dutton Park, QLD 4102, Australia
| | - Jian-Wei Liu
- Environment, Commonwealth Scientific and Industrial Research Organization, Agricultural and Environmental Sciences Precinct, Acton, Canberra, ACT 2601, Australia
| | - Tom Walsh
- Environment, Commonwealth Scientific and Industrial Research Organization, Agricultural and Environmental Sciences Precinct, Acton, Canberra, ACT 2601, Australia
| | - Dena Lyras
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3168, Australia
| | - Enzo A. Palombo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - David J. Beale
- Environment, Commonwealth Scientific and Industrial Research Organization, Ecosciences Precinct, Dutton Park, QLD 4102, Australia
- Correspondence:
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Caruso DJ, Palombo EA, Moulton SE, Zaferanloo B. Exploring the Promise of Endophytic Fungi: A Review of Novel Antimicrobial Compounds. Microorganisms 2022; 10:microorganisms10101990. [PMID: 36296265 PMCID: PMC9607381 DOI: 10.3390/microorganisms10101990] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [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: 09/20/2022] [Revised: 10/05/2022] [Accepted: 10/05/2022] [Indexed: 11/20/2022] Open
Abstract
Over the last few decades, many of the existing drugs used to treat infectious diseases have become increasingly ineffective due to the global emergence of antimicrobial resistance (AMR). As such, there is a constant demand to find new, effective compounds that could help to alleviate some of this pressure. Endophytic fungi have captured the attention of many researchers in this field, as they have displayed a vast ability to produce novel bioactive compounds, many of which possess wide-ranging antimicrobial activities. However, while highly promising, research in this area is still in its infancy. Endophytes inhabit the healthy tissues of plants asymptomatically, resulting in a mutualistic symbiosis in which the endophytes produce a plethora of bioactive compounds that support the fitness of the host plant. These compounds display great chemical diversity, representing structural groups, such as aliphatic compounds, alkaloids, peptides, phenolics, polyketides and terpenoids. In this review, the significant antimicrobial potential of endophytic fungi is detailed, highlighting their ability to produce novel and diverse antimicrobial compounds active against human, plant and marine pathogens. In doing so, it also highlights the significant contributions that endophytic fungi can make in our battle against AMR, thus providing the motivation to increase efforts in the search for new and effective antimicrobial drugs.
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Affiliation(s)
- Daniel J. Caruso
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
- Correspondence: (D.J.C.); (B.Z.)
| | - Enzo A. Palombo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Simon E. Moulton
- Department of Engineering Technologies, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Bita Zaferanloo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
- Correspondence: (D.J.C.); (B.Z.)
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Thompson AA, Wood JL, Palombo EA, Green WK, Wade SA. From laboratory tests to field trials: a review of cathodic protection and microbially influenced corrosion. Biofouling 2022; 38:298-320. [PMID: 35361009 DOI: 10.1080/08927014.2022.2058395] [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] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 03/18/2022] [Accepted: 03/21/2022] [Indexed: 06/14/2023]
Abstract
Cathodic protection (CP), an electrochemical method for managing corrosion, is widely used in many industries in both marine and buried environments. However, literature surrounding cathodic protection and its ability to prevent microbially influenced corrosion (MIC) is mixed. This review describes the mechanics of CP, how CP may influence MIC, and collates and summarises tests on CP and MIC reported in literature. The aim of the review is to identify any trends and knowledge gaps requiring further study. While the outcomes of CP testing are generally mixed, some trends can be seen and, overall, MIC is detrimental to the protective effects of CP, with CP being less effective when used according to current international standards. Tests conducted in the field or with mix communities of microbes showed that CP could be effective at preventing MIC, while tests with sulfate-reducing bacteria generally proved CP to be highly ineffective. It was commonly seen that the effectiveness of CP can be improved by increasing polarization, to potentials as low as -1000 mV (Ag/AgCl). However, a balance does need to be met via careful monitoring to ensure negative side effects of over protection do not become a major problem.
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Affiliation(s)
- A A Thompson
- Swinburne University of Technology, Melbourne, VIC, Australia
| | - J L Wood
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Bundoora, VIC, Australia
| | - E A Palombo
- Swinburne University of Technology, Melbourne, VIC, Australia
| | - W K Green
- Vinsi Partners Pty Ltd, Sydney, NSW, Australia
| | - S A Wade
- Swinburne University of Technology, Melbourne, VIC, Australia
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Shah RM, Stephenson S, Crosswell J, Gorman D, Hillyer KE, Palombo EA, Jones OAH, Cook S, Bodrossy L, van de Kamp J, Walsh TK, Bissett A, Steven ADL, Beale DJ. Omics-based ecosurveillance uncovers the influence of estuarine macrophytes on sediment microbial function and metabolic redundancy in a tropical ecosystem. Sci Total Environ 2022; 809:151175. [PMID: 34699819 DOI: 10.1016/j.scitotenv.2021.151175] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 10/18/2021] [Accepted: 10/19/2021] [Indexed: 06/13/2023]
Abstract
Vertical zonation within estuarine ecosystems can strongly influence microbial diversity and function by regulating competition, predation, and environmental stability. The degree to which microbial communities exhibit horizontal patterns through an estuary has received comparatively less attention. Here, we take a multi-omics ecosurveillance approach to study environmental gradients created by the transition between dominant vegetation types along a near pristine tropical river system (Wenlock River, Far North Queensland, Australia). The study sites included intertidal mudflats fringed by saltmarsh, mangrove or mixed soft substrata habitats. Collected sediments were analyzed for eukaryotes and prokaryotes using small sub-unit (SSU) rRNA gene amplicons to profile the relative taxonomic composition. Central carbon metabolism metabolites and other associated organic polar metabolites were analyzed using established metabolomics-based approaches, coupled with total heavy metals analysis. Eukaryotic taxonomic information was found to be more informative of habitat type. Bacterial taxonomy and community composition also showed habitat-specificity, with phyla Proteobacteria and Cyanobacteria strongly linked to mangroves and saltmarshes, respectively. In contrast, metabolite profiling was critical for understanding the biochemical pathways and expressed functional outputs in these systems that were tied to predicted microbial gene function (16S rRNA). A high degree of metabolic redundancy was observed in the bacterial communities, with the metabolomics data suggesting varying degrees of metabolic criticality based on habitat type. The predicted functions of the bacterial taxa combined with annotated metabolites accounted for the conservative perspective of microbial community redundancy against the putative metabolic pathway impacts in the metabolomics data. Coupling these data demonstrates that habitat-mediated estuarine gradients drive patterns of community diversity and metabolic function and highlights the real redundancy potential of habitat microbiomes. This information is useful as a point of comparison for these sensitive ecosystems and provides a framework for identifying potentially vulnerable or at-risk systems before they are significantly degraded.
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Affiliation(s)
- Rohan M Shah
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Dutton Park, QLD 4102, Australia; Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Sarah Stephenson
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Lucas Heights, NSW 2234, Australia
| | - Joseph Crosswell
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Dutton Park, QLD 4102, Australia
| | - Daniel Gorman
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Indian Ocean Marine Research Centre, Crawley, WA 6009, Australia
| | - Katie E Hillyer
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Dutton Park, QLD 4102, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Oliver A H Jones
- Australian Centre for Research on Separation Science (ACROSS), School of Science, RMIT University, Bundoora West Campus, PO Box 71, Bundoora, VIC 3083, Australia
| | - Stephen Cook
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Berrimah, NT 0828, Australia
| | - Levente Bodrossy
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Battery Point, TAS 7004, Australia
| | - Jodie van de Kamp
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Battery Point, TAS 7004, Australia
| | - Thomas K Walsh
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Acton, ACT 2601, Australia
| | - Andrew Bissett
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Battery Point, TAS 7004, Australia
| | - Andrew D L Steven
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Dutton Park, QLD 4102, Australia
| | - David J Beale
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Dutton Park, QLD 4102, Australia.
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11
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Derseh HB, Goodger JQD, Scheerlinck JPY, Samuel CS, Woodrow IE, Palombo EA, Cumming A, Snibson K. The efficacy and safety of pinocembrin in a sheep model of bleomycin-induced pulmonary fibrosis. PLoS One 2021; 16:e0260719. [PMID: 34855848 PMCID: PMC8638960 DOI: 10.1371/journal.pone.0260719] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 11/15/2021] [Indexed: 11/30/2022] Open
Abstract
The primary flavonoid, pinocembrin, is thought to have a variety of medical uses which relate to its reported anti-oxidant, anti-inflammatory, anti-microbial and anti-cancer properties. Some studies have reported that this flavonoid has anti-fibrotic activities. In this study, we investigated whether pinocembrin would impede fibrosis, dampen inflammation and improve lung function in a large animal model of pulmonary fibrosis. Fibrosis was induced in two localized lung segments in each of the 10 sheep participating in the study. This was achieved via two infusions of bleomycin delivered bronchoscopically at a two-week interval. Another lung segment in the same sheep was left untreated, and was used as a healthy control. The animals were kept for a little over 5 weeks after the final infusion of bleomycin. Pinocembrin, isolated from Eucalyptus leaves, was administered to one of the two bleomycin damaged lung segments at a dose of 7 mg. This dose was given once-weekly over 4-weeks, starting one week after the final bleomycin infusion. Lung compliance (as a measure of stiffness) was significantly improved after four weekly administrations of pinocembrin to bleomycin-damaged lung segments. There were significantly lower numbers of neutrophils and inflammatory cells in the bronchoalveolar lavage of bleomycin-infused lung segments that were treated with pinocembrin. Compared to bleomycin damaged lung segments without drug treatment, pinocembrin administration was associated with significantly lower numbers of immuno-positive CD8+ and CD4+ T cells in the lung parenchyma. Histopathology scoring data showed that pinocembrin treatment was associated with significant improvement in inflammation and overall pathology scores. Hydroxy proline analysis showed that the administration of pinocembrin did not reduce the increased collagen content that was induced by bleomycin in this model. Analyses of Masson’s Trichrome stained sections showed that pinocembrin treatment significantly reduced the connective tissue content in lung segments exposed to bleomycin when compared to bleomycin-infused lungs that did not receive pinocembrin. The striking anti-inflammatory and modest anti-fibrotic remodelling effects of pinocembrin administration were likely linked to the compound’s ability to improve lung pathology and functional compliance in this animal model of pulmonary fibrosis.
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Affiliation(s)
- Habtamu B. Derseh
- Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
- * E-mail: (HBD); (KS)
| | - Jason Q. D. Goodger
- School of Biosciences, University of Melbourne, Parkville, Victoria, Australia
| | - Jean-Pierre Y. Scheerlinck
- Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
| | - Chrishan S. Samuel
- Cardiovascular Disease Program, Monash Biomedicine Discovery Institute and Department of Pharmacology, Monash University, Clayton, Victoria, Australia
| | - Ian E. Woodrow
- School of Ecosystem and Forest Sciences, University of Melbourne, Parkville, Victoria, Australia
| | - Enzo A. Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | | | - Ken Snibson
- Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
- * E-mail: (HBD); (KS)
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12
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Jayawardene KLTD, Palombo EA, Boag PR. Natural Products Are a Promising Source for Anthelmintic Drug Discovery. Biomolecules 2021; 11:1457. [PMID: 34680090 PMCID: PMC8533416 DOI: 10.3390/biom11101457] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [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: 08/11/2021] [Revised: 09/23/2021] [Accepted: 09/28/2021] [Indexed: 12/23/2022] Open
Abstract
Parasitic nematodes infect almost all forms of life. In the human context, parasites are one of the major causative factors for physical and intellectual growth retardation in the developing world. In the agricultural setting, parasites have a great economic impact through a reduction in livestock performance or control cost. The main method of controlling these devastating conditions is the use of anthelmintic drugs. Unfortunately, there are only a few anthelmintic drug classes available in the market and significant resistance has developed in most of the parasitic species of livestock. Therefore, development of new anthelmintics with different modes of action is critical for sustainable parasitic control in the future. The drug development pipeline is broadly limited to two types of molecules, namely synthetic compounds and natural plant products. Compared to synthetic compounds, natural products are highly diverse, and many have historically proven valuable in folk medicine to treat various gastrointestinal ailments. This review focus on the use of traditional knowledge-based plant extracts in the development of new therapeutic leads, the approaches used as screening techniques, and common bottlenecks and opportunities in plant-based anthelmintic drug discovery.
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Affiliation(s)
- K. L. T. Dilrukshi Jayawardene
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Monash University, Melbourne, VIC 3800, Australia;
- Development and Stem Cells Program, Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC 3800, Australia
| | - Enzo A. Palombo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, VIC 3122, Australia
| | - Peter R. Boag
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Monash University, Melbourne, VIC 3800, Australia;
- Development and Stem Cells Program, Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC 3800, Australia
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13
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Jadhav SR, Bryant G, Mata JP, Ife A, Eldridge DS, Palombo EA, Harding IH, Shah RM. Structural aspects of a self-emulsifying multifunctional amphiphilic excipient: Part I. The case of Gelucire® 44/14. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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14
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Shah RM, Hillyer KE, Stephenson S, Crosswell J, Karpe AV, Palombo EA, Jones OAH, Gorman D, Bodrossy L, van de Kamp J, Bissett A, Whiteley AS, Steven ADL, Beale DJ. Functional analysis of pristine estuarine marine sediments. Sci Total Environ 2021; 781:146526. [PMID: 33798899 DOI: 10.1016/j.scitotenv.2021.146526] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 03/10/2021] [Accepted: 03/12/2021] [Indexed: 06/12/2023]
Abstract
Traditional environmental monitoring techniques are well suited to resolving acute exposure effects but lack resolution in determining subtle shifts in ecosystem functions resulting from chronic exposure(s). Surveillance with sensitive omics-based technologies could bridge this gap but, to date, most omics-based environmental studies have focused on previously degraded environments, identifying key metabolic differences resulting from anthropogenic perturbations. Here, we apply omics-based approaches to pristine environments to establish blueprints of microbial functionality within healthy estuarine sediment communities. We collected surface sediments (n = 50) from four pristine estuaries along the Western Cape York Peninsula of Far North Queensland, Australia. Sediment microbiomes were analyzed for 16S rRNA amplicon sequences, central carbon metabolism metabolites and associated secondary metabolites via targeted and untargeted metabolic profiling methods. Multivariate statistical analyses indicated heterogeneity among all the sampled estuaries, however, taxa-function relationships could be established that predicted community metabolism potential. Twenty-four correlated gene-metabolite pathways were identified and used to establish sediment microbial blueprints of essential carbon metabolism and amino acid biosynthesis that were positively correlated with community metabolic function outputs (2-oxisocapraote, tryptophan, histidine citrulline and succinic acid). In addition, an increase in the 125 KEGG genes related to metal homeostasis and metal resistance was observed, although, none of the detected metabolites related to these specific genes upon integration. However, there was a correlation between metal abundance and functional genes related to Fe and Zn metabolism. Our results establish a baseline microbial blueprint for the pristine sediment microbiome, one that drives important ecosystem services and to which future ecosurveillance monitoring can be compared.
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Affiliation(s)
- Rohan M Shah
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Dutton Park, QLD 4102, Australia; Department of Chemistry and Biotechnology, School of Science, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Katie E Hillyer
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Dutton Park, QLD 4102, Australia
| | - Sarah Stephenson
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Lucas Heights, NSW 2234, Australia
| | - Joseph Crosswell
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Dutton Park, QLD 4102, Australia
| | - Avinash V Karpe
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Dutton Park, QLD 4102, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, School of Science, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Oliver A H Jones
- Australian Centre for Research on Separation Science (ACROSS), School of Science, RMIT University, Bundoora West Campus, PO Box 71, Bundoora, VIC 3083, Australia
| | - Daniel Gorman
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Indian Ocean Marine Research Centre, Crawley, WA 6009, Australia
| | - Levente Bodrossy
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Battery Point, TAS 7004, Australia
| | - Jodie van de Kamp
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Battery Point, TAS 7004, Australia
| | - Andrew Bissett
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Battery Point, TAS 7004, Australia
| | - Andrew S Whiteley
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Floreat, WA 6014, Australia
| | - Andy D L Steven
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Dutton Park, QLD 4102, Australia
| | - David J Beale
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Dutton Park, QLD 4102, Australia.
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15
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Karpe AV, Hutton ML, Mileto SJ, James ML, Evans C, Shah RM, Ghodke AB, Hillyer KE, Metcalfe SS, Liu JW, Walsh T, Lyras D, Palombo EA, Beale DJ. Cryptosporidiosis Modulates the Gut Microbiome and Metabolism in a Murine Infection Model. Metabolites 2021; 11:metabo11060380. [PMID: 34208228 PMCID: PMC8230837 DOI: 10.3390/metabo11060380] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 06/01/2021] [Accepted: 06/01/2021] [Indexed: 02/07/2023] Open
Abstract
Cryptosporidiosis is a major human health concern globally. Despite well-established methods, misdiagnosis remains common. Our understanding of the cryptosporidiosis biochemical mechanism remains limited, compounding the difficulty of clinical diagnosis. Here, we used a systems biology approach to investigate the underlying biochemical interactions in C57BL/6J mice infected with Cryptosporidium parvum. Faecal samples were collected daily following infection. Blood, liver tissues and luminal contents were collected 10 days post infection. High-resolution liquid chromatography and low-resolution gas chromatography coupled with mass spectrometry were used to analyse the proteomes and metabolomes of these samples. Faeces and luminal contents were additionally subjected to 16S rRNA gene sequencing. Univariate and multivariate statistical analysis of the acquired data illustrated altered host and microbial energy pathways during infection. Glycolysis/citrate cycle metabolites were depleted, while short-chain fatty acids and D-amino acids accumulated. An increased abundance of bacteria associated with a stressed gut environment was seen. Host proteins involved in energy pathways and Lactobacillus glyceraldehyde-3-phosphate dehydrogenase were upregulated during cryptosporidiosis. Liver oxalate also increased during infection. Microbiome–parasite relationships were observed to be more influential than the host–parasite association in mediating major biochemical changes in the mouse gut during cryptosporidiosis. Defining this parasite–microbiome interaction is the first step towards building a comprehensive cryptosporidiosis model towards biomarker discovery, and rapid and accurate diagnostics.
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Affiliation(s)
- Avinash V. Karpe
- Land and Water, Commonwealth Scientific and Industrial Research Organization, Ecosciences Precinct, Dutton Park, QLD 4102, Australia; (A.V.K.); (R.M.S.); (K.E.H.); (S.S.M.)
| | - Melanie L. Hutton
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3800, Australia; (M.L.H.); (S.J.M.); (M.L.J.); (C.E.); (D.L.)
| | - Steven J. Mileto
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3800, Australia; (M.L.H.); (S.J.M.); (M.L.J.); (C.E.); (D.L.)
| | - Meagan L. James
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3800, Australia; (M.L.H.); (S.J.M.); (M.L.J.); (C.E.); (D.L.)
| | - Chris Evans
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3800, Australia; (M.L.H.); (S.J.M.); (M.L.J.); (C.E.); (D.L.)
| | - Rohan M. Shah
- Land and Water, Commonwealth Scientific and Industrial Research Organization, Ecosciences Precinct, Dutton Park, QLD 4102, Australia; (A.V.K.); (R.M.S.); (K.E.H.); (S.S.M.)
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia;
| | - Amol B. Ghodke
- Queensland Alliance for Agriculture and Food Innovation, Department of Horticulture, The University of Queensland, St Lucia, QLD 4072, Australia;
- BIO21 Institute, School of Biosciences, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Katie E. Hillyer
- Land and Water, Commonwealth Scientific and Industrial Research Organization, Ecosciences Precinct, Dutton Park, QLD 4102, Australia; (A.V.K.); (R.M.S.); (K.E.H.); (S.S.M.)
| | - Suzanne S. Metcalfe
- Land and Water, Commonwealth Scientific and Industrial Research Organization, Ecosciences Precinct, Dutton Park, QLD 4102, Australia; (A.V.K.); (R.M.S.); (K.E.H.); (S.S.M.)
| | - Jian-Wei Liu
- Land and Water, Commonwealth Scientific and Industrial Research Organization Research and Innovation Park, Acton, ACT 2601, Australia; (J.-W.L.); (T.W.)
| | - Tom Walsh
- Land and Water, Commonwealth Scientific and Industrial Research Organization Research and Innovation Park, Acton, ACT 2601, Australia; (J.-W.L.); (T.W.)
| | - Dena Lyras
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, VIC 3800, Australia; (M.L.H.); (S.J.M.); (M.L.J.); (C.E.); (D.L.)
| | - Enzo A. Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia;
| | - David J. Beale
- Land and Water, Commonwealth Scientific and Industrial Research Organization, Ecosciences Precinct, Dutton Park, QLD 4102, Australia; (A.V.K.); (R.M.S.); (K.E.H.); (S.S.M.)
- Correspondence: ; Tel.: +61-7-3833-5774
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16
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Hedley N, Richards DG, Palombo EA. Rapid preparation of gastrointestinal nematode eggs from faeces for PCR identification. J Microbiol Methods 2021; 187:106257. [PMID: 34062212 DOI: 10.1016/j.mimet.2021.106257] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 05/26/2021] [Accepted: 05/27/2021] [Indexed: 11/15/2022]
Abstract
Detection of gastrointestinal nematodes (GIN) as both a qualitative and quantitative test is highly desirable. Methods such as multiplex and qPCR are capable of providing such results, but can be laborious and expensive. This paper presents a rapid, low-cost method of preparing GIN egg from faecal samples that produces DNA suitable for PCR analysis. We also describe a set of primers that are suitable for single-tube multiplex PCR.
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Affiliation(s)
- Nicole Hedley
- Department of Chemistry and Biotechnology, Swinburne University of Technology, John Street, Hawthorn, VIC 3122, Australia.
| | - D Grant Richards
- Gretals Australia, Unit 8/1140 Nepean Highway, Mornington, VIC 3931, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, John Street, Hawthorn, VIC 3122, Australia
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17
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Rahman I, Mujahid A, Palombo EA, Müller M. A functional gene-array analysis of microbial communities settling on microplastics in a peat-draining environment. Mar Pollut Bull 2021; 166:112226. [PMID: 33711605 DOI: 10.1016/j.marpolbul.2021.112226] [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] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 02/22/2021] [Accepted: 02/25/2021] [Indexed: 06/12/2023]
Abstract
Concerns about microplastic (MP) pollution arise from the rafting potential of these durable particles which potentially propagate harmful chemicals and bacteria across wide spatial gradients. While many studies have been conducted in the marine environment, knowledge of MPs in coastal and freshwater systems is limited. For this study, we exposed two MPs (polyethylene terephthalate and polylactic acid) to the undisturbed peat-draining Maludam River in Malaysia, for 6 months. The microbial communities on these MPs and the surrounding water were sequenced by MiSeq, while the genetic responses of these communities were assessed by GeoChip 5.0S. Microbial communities were dominated by the phyla Proteobacteria, Acidobacteria and Actinobacteria. Metabolic processes involved with carbon, nitrogen, sulfur, metal homeostasis, organic remediation and virulence had significantly different gene expression among the communities on MPs and in the surrounding water. Our study is the first to look at changes in gene expression of whole plastisphere communities.
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Affiliation(s)
- Ishraq Rahman
- Faculty of Engineering, Computing and Science, Swinburne University of Technology, Sarawak Campus, 93350 Kuching, Sarawak, Malaysia; International University of Business, Agriculture and Technology (IUBAT), Uttara, Dhaka 1230, Bangladesh
| | - Aazani Mujahid
- Faculty of Resource Science & Technology, University Malaysia Sarawak, 94300, Sarawak, Malaysia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Moritz Müller
- Faculty of Engineering, Computing and Science, Swinburne University of Technology, Sarawak Campus, 93350 Kuching, Sarawak, Malaysia.
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18
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Abstract
Listeria monocytogenes is a major food-borne pathogen and causative agent of a fatal disease, listeriosis. Stringent regulatory guidelines and zero tolerance policy toward this bacterium necessitate rapid, accurate, and reliable methods of identification and subtyping. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-ToF MS) has recently become a method of choice for routine identification of pathogens in clinical settings and has largely replaced biochemical assays. Identification relies on well-curated databases such as SARAMIS. Extensive use of SARAMIS to generate consensus mass spectra, in conjunction with statistical analysis, such as partial least square-discriminant analysis and hierarchical cluster analysis, is useful in subtyping bacteria. While MALDI-ToF MS has been extensively used for pathogen detection, its application in bacterial subtyping has been limited. The protocol describes a MALDI-ToF MS workflow as a single tool for simultaneous identification and subtyping of L. monocytogenes directly from solid culture medium.
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Affiliation(s)
- Snehal R Jadhav
- Centre for Advanced Sensory Science, School of Exercise and Nutrition Sciences, Deakin University, Melbourne, VIC, Australia.
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Melbourne, VIC, Australia.
| | - Rohan M Shah
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Melbourne, VIC, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Melbourne, VIC, Australia.
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Shagaghi N, Clayton AHA, Aguilar MI, Lee TH, Palombo EA, Bhave M. Effects of Rationally Designed Physico-Chemical Variants of the Peptide PuroA on Biocidal Activity towards Bacterial and Mammalian Cells. Int J Mol Sci 2020; 21:ijms21228624. [PMID: 33207639 PMCID: PMC7696940 DOI: 10.3390/ijms21228624] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 08/26/2020] [Revised: 10/20/2020] [Accepted: 11/11/2020] [Indexed: 01/07/2023] Open
Abstract
Antimicrobial peptides (AMPs) often exhibit wide-spectrum activities and are considered ideal candidates for effectively controlling persistent and multidrug-resistant wound infections. PuroA, a synthetic peptide based on the tryptophan (Trp)-rich domain of the wheat protein puroindoline A, displays strong antimicrobial activities. In this work, a number of peptides were designed based on PuroA, varying in physico-chemical parameters of length, number of Trp residues, net charge, hydrophobicity or amphipathicity, D-versus L-isomers of amino acids, cyclization or dimerization, and were tested for antimicrobial potency and salt and protease tolerance. Selected peptides were assessed for effects on biofilms of methicillin-resistant Staphylococcus aureus (MRSA) and selected mammalian cells. Peptide P1, with the highest amphipathicity, six Trp and a net charge of +7, showed strong antimicrobial activity and salt stability. Peptides W7, W8 and WW (seven to eight residues) were generally more active than PuroA and all diastereomers were protease-resistant. PuroA and certain variants significantly inhibited initial biomass attachment and eradicated preformed biofilms of MRSA. Further, P1 and dimeric PuroA were cytotoxic to HeLa cells. The work has led to peptides with biocidal effects on common human pathogens and/or anticancer potential, also offering great insights into the relationship between physico-chemical parameters and bioactivities, accelerating progress towards rational design of AMPs for therapeutics.
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Affiliation(s)
- Nadin Shagaghi
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; (N.S.); (E.A.P.)
| | - Andrew H. A. Clayton
- Centre for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia;
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia; (M.-I.A.); (T.-H.L.)
| | - Tzong-Hsien Lee
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia; (M.-I.A.); (T.-H.L.)
| | - Enzo A. Palombo
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; (N.S.); (E.A.P.)
| | - Mrinal Bhave
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; (N.S.); (E.A.P.)
- Correspondence: ; Tel.: +61-3-9214-5759
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Radmehr B, Zaferanloo B, Tran T, Beale DJ, Palombo EA. Prevalence and Characteristics of Bacillus cereus Group Isolated from Raw and Pasteurised Milk. Curr Microbiol 2020; 77:3065-3075. [PMID: 32696237 DOI: 10.1007/s00284-020-02129-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 04/16/2020] [Accepted: 07/11/2020] [Indexed: 12/12/2022]
Abstract
The elimination of spore-forming bacteria is not guaranteed by current pasteurisation processes and is a challenging problem for the dairy industry. Given that Bacillus cereus sensu lato (B. cereus group) is an important foodborne pathogen and spoiler in the dairy industry, this study aimed at evaluating the prevalence and characteristics of B. cereus group in raw and pasteurised milk samples collected in Victoria, Australia. Isolated B. cereus group were tested for antimicrobial susceptibility, biofilm formation and virulence properties. Genetic diversity was assessed using ERIC-PCR. Proteomic profiling using MALDI-TOF MS and chemical profiling using Fourier-transform infrared (FTIR) spectroscopy were also applied for clustering of the isolates. Results showed 42.3% of milk samples contained B. cereus group, with a higher contamination level for pasteurised milk. Virulence studies identified genes nheA, nheB, hblA and nheC in most isolates and cyk gene in 46% of all isolates. Antimicrobial susceptibility testing showed a high prevalence of resistance towards ampicillin, ceftriaxone and penicillin. The biofilm-forming capacity of our isolates showed that most (53.7%) had the ability to form a biofilm. Genetic profiling using ERIC-PCR placed most B. cereus group isolates from pasteurised milk in the same cluster, indicating that they probably originated from a similar source. Raw milk isolates showed greater diversity indicating various sources. FTIR spectroscopy showed high agreement with genetic profiling. In contrast, low agreement between proteomic (MALDI-TOF MS) and genetic typing was observed. The present study showed that the FTIR spectroscopy could be adopted as a rapid tool for the typing of B. cereus group. Overall, the virulence and antimicrobial resistance characteristics, together with the ability of isolates to produce biofilm, indicate the importance of B. cereus group in the Australian dairy industry.
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Affiliation(s)
- Behrad Radmehr
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Bita Zaferanloo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Thien Tran
- Bruker Pty Ltd, Preston, VIC, 3072, Australia
| | - David J Beale
- Land and Water, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Ecosciences Precinct, Dutton Park, QLD, 4102, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia.
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21
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Topa SH, Palombo EA, Kingshott P, Blackall LL. Activity of Cinnamaldehyde on Quorum Sensing and Biofilm Susceptibility to Antibiotics in Pseudomonas aeruginosa. Microorganisms 2020; 8:microorganisms8030455. [PMID: 32210139 PMCID: PMC7143970 DOI: 10.3390/microorganisms8030455] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [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: 02/20/2020] [Revised: 03/15/2020] [Accepted: 03/22/2020] [Indexed: 02/04/2023] Open
Abstract
Quorum sensing (QS) plays an important role during infection for the opportunistic human pathogen Pseudomonas aeruginosa. Quorum sensing inhibition (QSI) can disrupt this initial event of infection without killing bacterial cells, and thus QS inhibitors have been suggested as novel approaches for anti-infective therapy. Cinnamaldehyde (CAD) is a P. aeruginosa biofilm inhibitor and disperser of preformed biofilms. In this study, the combined use of CAD and colistin (COL) revealed a synergistic activity, but this was not the case for CAD combined with carbenicillin, tobramycin (TOB), or erythromycin in checkerboard assays for P. aeruginosa. CAD demonstrated QSI activity by repression of the expression of lasB, rhlA and pqsA in GFP reporter assays. Approximately 70% reduction in GFP production was observed with the highest CAD concentration tested in all the QS reporter strains. TOB also showed strong QSI when combined with CAD in reporter assays. Combination treatments revealed an additive activity of CAD with COL and TOB in biofilm inhibition (75.2% and 83.9%, respectively) and preformed biofilm dispersion (~90% for both) when compared to the individual treatments. Therefore, a proposed method to mitigate P. aeruginosa infection is a combination therapy of CAD with COL or CAD with TOB as alternatives to current individual drug therapies.
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Affiliation(s)
- Sanjida Halim Topa
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia; (E.A.P.); (P.K.); (L.L.B.)
- Correspondence: ; Tel.: +61-426201626
| | - Enzo A. Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia; (E.A.P.); (P.K.); (L.L.B.)
| | - Peter Kingshott
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia; (E.A.P.); (P.K.); (L.L.B.)
| | - Linda L. Blackall
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia; (E.A.P.); (P.K.); (L.L.B.)
- School of Biosciences, The University of Melbourne, Parkville, VIC 3052, Australia
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Palombo EA. Ethanol treatment does not inactivate spore-forming bacteria - A cautionary note about the safe transport of bacteria prior to identification by MALDI-TOF MS. J Microbiol Methods 2020; 172:105893. [PMID: 32184160 DOI: 10.1016/j.mimet.2020.105893] [Citation(s) in RCA: 1] [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] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 03/13/2020] [Indexed: 11/29/2022]
Abstract
Treatment with 70% ethanol has been proposed as a safe and effective way to inactive bacteria for transport between laboratories prior to identification by MALDI-TOF MS. Ethanol alone does not inactivate spore-forming bacteria and additional chemical or physical treatment is necessary to guarantee inactivation of bacterial spores.
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Affiliation(s)
- Enzo A Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia.
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23
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Shah RM, Crosswell J, Metcalfe SS, Carlin G, Morrison PD, Karpe AV, Palombo EA, Steven ADL, Beale DJ. Influence of Human Activities on Broad-Scale Estuarine-Marine Habitats Using Omics-Based Approaches Applied to Marine Sediments. Microorganisms 2019; 7:microorganisms7100419. [PMID: 31590307 PMCID: PMC6843362 DOI: 10.3390/microorganisms7100419] [Citation(s) in RCA: 9] [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: 08/16/2019] [Accepted: 09/24/2019] [Indexed: 11/23/2022] Open
Abstract
Rapid urban expansion and increased human activities have led to the progressive deterioration of many marine ecosystems. The diverse microbial communities that inhabit these ecosystems are believed to influence large-scale geochemical processes and, as such, analyzing their composition and functional metabolism can be a means to assessing an ecosystem’s resilience to physical and chemical perturbations, or at the very least provide baseline information and insight into future research needs. Here we show the utilization of organic and inorganic contaminant screening coupled with metabolomics and bacterial 16S rRNA gene sequencing to assess the microbial community structure of marine sediments and their functional metabolic output. The sediments collected from Moreton Bay (Queensland, Australia) contained low levels of organic and inorganic contaminants, typically below guideline levels. The sequencing dataset suggest that sulfur and nitrite reduction, dehalogenation, ammonia oxidation, and xylan degradation were the major metabolic functions. The community metabolites suggest a level of functional homogeneity down the 40-cm core depth sampled, with sediment habitat identified as a significant driver for metabolic differences. The communities present in river and sandy channel samples were found to be the most active, with the river habitats likely to be dominated by photoheterotrophs that utilized carbohydrates, fatty acids and alcohols as well as reduce nitrates to release atmospheric nitrogen and oxidize sulfur. Bioturbated mud habitats showed overlapping faunal activity between riverine and sandy ecosystems. Nitrogen-fixing bacteria and lignin-degrading bacteria were most abundant in the sandy channel and bioturbated mud, respectively. The use of omics-based approaches provide greater insight into the functional metabolism of these impacted habitats, extending beyond discrete monitoring to encompassing whole community profiling that represents true phenotypical outputs. Ongoing omics-based monitoring that focuses on more targeted pathway analyses is recommended in order to quantify the flux changes within these systems and establish variations from these baseline measurements.
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Affiliation(s)
- Rohan M Shah
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, P. O. Box 218, Hawthorn, VIC 3122, Australia.
| | - Joseph Crosswell
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organization, P. O. Box 2583, Dutton Park, QLD 4001, Australia.
| | - Suzanne S Metcalfe
- Land and Water, Commonwealth Scientific and Industrial Research Organization, P. O. Box 2583, Dutton Park, QLD 4001, Australia.
| | - Geoffrey Carlin
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organization, P. O. Box 2583, Dutton Park, QLD 4001, Australia.
| | - Paul D Morrison
- Australian Centre for Research on Separation Science, School of Applied Sciences, RMIT University, Melbourne, VIC 3001, Australia.
| | - Avinash V Karpe
- Land and Water, Commonwealth Scientific and Industrial Research Organization, P. O. Box 2583, Dutton Park, QLD 4001, Australia.
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, P. O. Box 218, Hawthorn, VIC 3122, Australia.
| | - Andy D L Steven
- Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organization, P. O. Box 2583, Dutton Park, QLD 4001, Australia.
| | - David J Beale
- Land and Water, Commonwealth Scientific and Industrial Research Organization, P. O. Box 2583, Dutton Park, QLD 4001, Australia.
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Hedley N, Richards DG, Palombo EA. Looking for insight: The role of parasite tester opinions in farm management. Prev Vet Med 2019; 171:104769. [PMID: 31518829 DOI: 10.1016/j.prevetmed.2019.104769] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 08/28/2019] [Accepted: 09/02/2019] [Indexed: 11/25/2022]
Abstract
Gastrointestinal nematode (GIN) infections cause millions of dollars of economic loss annually. Increasing cases of anthelmintic resistance have resulted in calls for restricted drug use and implementation of sustainable management practices to slow the rate of resistance. The limited uptake of available management systems and advice has sparked multiple surveys into the psychology and behaviours preventing uptake. These surveys have looked mainly at the farmers, the majority of whom have reported they rely on the advice of their local veterinarian or suppliers for treatment and management. However, there is little research into the psychology of veterinarians and people performing animal health testing on this topic. In the current study, a short survey of people performing faecal egg counts on animals was conducted. The survey focused on identifying areas for improving diagnosis to encourage uptake, and found other areas of interest worth further investigation. Respondents most frequently named manual labour as the main contributor to the cost of testing (65% of respondents) with analysis (42%) and sample preparation (32%) being the main contributors to time. In the survey comments, there was little consistency or commonality in the issues raised. The disparity between onsite and laboratory testers is an area worth investigation, particularly into how to co-ordinate behaviour and advice between proactive farmers and parasitology/veterinary services. Further investigation could provide better insight into how to encourage and maintain sustainable practices on farms.
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Leclair RM, McLean SK, Dunn LA, Meyer D, Palombo EA. Investigating the Effects of Time and Temperature on the Growth of Escherichia coli O157:H7 and Listeria monocytogenes in Raw Cow's Milk Based on Simulated Consumer Food Handling Practices. Int J Environ Res Public Health 2019; 16:E2691. [PMID: 31357682 PMCID: PMC6696089 DOI: 10.3390/ijerph16152691] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 07/15/2019] [Accepted: 07/24/2019] [Indexed: 11/16/2022]
Abstract
Consumption of raw cow's milk (RCM) is increasing in popularity in developed countries despite the associated foodborne disease risks. While previous research has focused on consumer motivations for drinking RCM, there is limited research on how consumer handling practices may impact the microbiological safety of RCM. In this study, consumer handling practices associated with transport, storage, and freezing and thawing were simulated to investigate the impact of time and temperature variables on the concentrations of either Escherichia coli O157:H7 or Listeria monocytogenes in RCM. We found that the type of storage during simulated transport had a large (η2 = 0.70) and significant (p < 0.001) effect on both pathogens. The refrigeration temperature also had a large (η2 = 0.43) and significant (p < 0.001) effect on both pathogens during refrigerated storage. The interaction between pathogen species and initial pathogen inoculum level had a large (η2 = 0.20) and significant (p = 0.012) effect on the concentration of the pathogens during ambient temperature storage. We found that freezing and thawing practices did not have a significant effect on the pathogens (p > 0.05). However, we were able to recover L. monocytogenes, but not E. coli O157:H7, from RCM after freezing for 365 days. The results from this study highlight that consumer transport and storage practices can have significant effects on the growth of E. coli O157:H7 and L. monocytogenes in RCM. Consumer food handling practices should be considered when developing public health strategies aimed at reducing the risks of RCM consumption.
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Affiliation(s)
- Roselyn M Leclair
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia.
| | - Sarah K McLean
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Louise A Dunn
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Denny Meyer
- Department of Statistics, Data Science and Epidemiology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
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26
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Kumarasingha R, Young ND, Yeo TC, Lim DSL, Tu CL, Palombo EA, Shaw JM, Gasser RB, Boag PR. Transcriptional alterations in Caenorhabditis elegans following exposure to an anthelmintic fraction of the plant Picria fel-terrae Lour. Parasit Vectors 2019; 12:181. [PMID: 31023350 PMCID: PMC6485125 DOI: 10.1186/s13071-019-3429-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 12/06/2018] [Accepted: 04/03/2019] [Indexed: 01/18/2023] Open
Abstract
Background Natural compounds from plants are known to provide a source of anthelmintic molecules. In previous studies, we have shown that plant extracts from the plant Picria fel-terrae Lour. and particular fractions thereof have activity against the free-living nematode Caenorhabditis elegans, causing quite pronounced stress responses in this nematode. We have also shown that a fraction, designated Pf-fraction 5, derived from this plant has a substantial adverse effect on this worm; however, nothing is known about the molecular processes affected in the worm. In the present study, we explored this aspect. Results Key biological processes linked to upregulated genes (n = 214) included ‘response to endoplasmic reticulum stress’ and ‘lipid metabolism’, and processes representing downregulated genes (n = 357) included ‘DNA-conformation change’ and ‘cellular lipid metabolism’. Conclusions Exposure of C. elegans to Pf-fraction 5 induces significant changes in the transcriptome. Gene ontology analysis suggests that Pf-fraction 5 induces endoplasmic reticulum and mitochondrial stress, and the changes in gene expression are either a direct or indirect consequence of this. Further work is required to assess specific responses to sub-fractions of Pf-fraction 5 in time-course experiments in C. elegans, to define the chemical(s) with potent anthelmintic properties, to attempt to unravel their mode(s) of action and to assess their selectivity against nematodes. Electronic supplementary material The online version of this article (10.1186/s13071-019-3429-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Rasika Kumarasingha
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Clayton, Victoria, 3800, Australia.,Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, 3800, Australia
| | - Neil D Young
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Tiong-Chia Yeo
- Sarawak Biodiversity Centre, KM 20 Jalan Borneo Heights, Semengoh, Locked Bag 3032, 93990, Kuching, Sarawak, Malaysia
| | - Diana S L Lim
- Sarawak Biodiversity Centre, KM 20 Jalan Borneo Heights, Semengoh, Locked Bag 3032, 93990, Kuching, Sarawak, Malaysia
| | - Chu-Lee Tu
- Sarawak Biodiversity Centre, KM 20 Jalan Borneo Heights, Semengoh, Locked Bag 3032, 93990, Kuching, Sarawak, Malaysia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria, 3122, Australia
| | - Jillian M Shaw
- Department of Health and Medical Sciences, Faculty of Health, Arts and Design, Swinburne University of Technology, Hawthorn, Victoria, 3122, Australia
| | - Robin B Gasser
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia.
| | - Peter R Boag
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Clayton, Victoria, 3800, Australia. .,Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, 3800, Australia. .,Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia.
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Beale DJ, Oh DY, Karpe AV, Tai C, Dunn MS, Tilmanis D, Palombo EA, Hurt AC. Untargeted metabolomics analysis of the upper respiratory tract of ferrets following influenza A virus infection and oseltamivir treatment. Metabolomics 2019; 15:33. [PMID: 30830484 DOI: 10.1007/s11306-019-1499-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 02/21/2019] [Indexed: 12/15/2022]
Abstract
INTRODUCTION Influenza is a highly contagious respiratory disease that causes high global morbidity and mortality each year. The dynamics of an influenza infection on the host metabolism, and how metabolism is altered in response to neuraminidase inhibitor drug therapy, is still in its infancy but of great importance. OBJECTIVES We aim to investigate the suitability of ferret nasal wash samples for metabolomics-based analysis and characterization of influenza infections and oseltamivir treatment. METHODS Virological and metabolic analyses were performed on nasal wash samples collected from ferrets treated with oseltamivir or a placebo. Untargeted metabolomics was performed using a gas chromatography coupled with mass spectrometery (GC-MS) based protocol that comprised a retention time (RT) locked method and the use of a commercial metabolomics library. RESULTS Ferret activity was reduced at 2-3 days post infection, which coincided with the highest influenza viral titre. The metabolomics data indicated a shift in metabolism during various stages of infection. The neuraminidase inhibitor oseltamivir created considerable downregulation of energy center metabolites (glucose, sucrose, glycine and glutamine), which generated high levels of branched amino acids. This further increased branched amino acid degradation and deregulation via glycerate-type intermediates and biosynthesis of fatty acids in oseltamivir-treated animals where abrogated weight loss was observed. CONCLUSION Metabolomics was used to profile influenza infection and antiviral drug treatment in ferrets. This has the potential to provide indicators for the early diagnosis of influenza infection and assess the effectiveness of drug therapies.
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Affiliation(s)
- David J Beale
- Commonwealth Scientific & Industrial Research Organization (CSIRO), Land & Water, P.O. Box 2583, Brisbane, QLD, 4001, Australia.
| | - Ding Yuan Oh
- WHO Collaborating Centre for Reference and Research on Influenza, VIDRL, at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia.
- School of Health and Life Sciences, Federation University, Churchill, VIC, Australia.
| | - Avinash V Karpe
- Commonwealth Scientific & Industrial Research Organization (CSIRO), Land & Water, P.O. Box 2583, Brisbane, QLD, 4001, Australia
| | - Celeste Tai
- WHO Collaborating Centre for Reference and Research on Influenza, VIDRL, at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - Michael S Dunn
- Analytical Science and Technology, Seqirus, Parkville, VIC, 3052, Australia
| | - Danielle Tilmanis
- WHO Collaborating Centre for Reference and Research on Influenza, VIDRL, at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - Enzo A Palombo
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC, 3122, Australia
| | - Aeron C Hurt
- WHO Collaborating Centre for Reference and Research on Influenza, VIDRL, at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
- Department of Microbiology and Immunology, University of Melbourne, Parkville, VIC, Australia
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28
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Jadhav SR, Shah RM, Karpe AV, Beale DJ, Kouremenos KA, Palombo EA. Identification of Putative Biomarkers Specific to Foodborne Pathogens Using Metabolomics. Methods Mol Biol 2019; 1918:149-164. [PMID: 30580406 DOI: 10.1007/978-1-4939-9000-9_12] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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] [Indexed: 06/09/2023]
Abstract
Metabolomics is one of the more recently developed "omics" that measures low molecular weight (typically < 1500 Da) compounds in biological samples. Metabolomics has been widely explored in environmental, clinical, and industrial biotechnology applications. However, its application to the area of food safety has been limited but preliminary work has demonstrated its value. This chapter describes an untargeted (nontargeted) metabolomics workflow using gas chromatography coupled to mass spectrometry (GC-MS) for characterizing three globally important foodborne pathogens, Escherichia coli O157:H7, Listeria monocytogenes, and Salmonella enterica, from selective enrichment liquid culture media. The workflow involves a detailed description of food spiking experiments followed by procedures for extraction of polar metabolites from media, analyzing the extracts using GC-MS and, finally, chemometric data analysis using the software "SIMCA" to identify potential pathogen-specific biomarkers.
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Affiliation(s)
- Snehal R Jadhav
- Department of Chemistry and Biotechnology, School of Science, Swinburne University of Technology, Melbourne, VIC, Australia
- Centre for Advanced Sensory Science, School of Exercise and Nutrition Sciences, Deakin University, Melbourne, VIC, Australia
| | - Rohan M Shah
- Department of Chemistry and Biotechnology, School of Science, Swinburne University of Technology, Melbourne, VIC, Australia
| | - Avinash V Karpe
- Department of Chemistry and Biotechnology, School of Science, Swinburne University of Technology, Melbourne, VIC, Australia
- Land and Water, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Brisbane, QLD, Australia
| | - David J Beale
- Land and Water, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Brisbane, QLD, Australia
| | - Konstantinos A Kouremenos
- Metabolomics Australia, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Melbourne, VIC, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, School of Science, Swinburne University of Technology, Melbourne, VIC, Australia.
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29
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Jadhav SR, Shah RM, Karpe AV, Morrison PD, Kouremenos K, Beale DJ, Palombo EA. Detection of Foodborne Pathogens Using Proteomics and Metabolomics-Based Approaches. Front Microbiol 2018; 9:3132. [PMID: 30619201 PMCID: PMC6305589 DOI: 10.3389/fmicb.2018.03132] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [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: 06/10/2018] [Accepted: 12/04/2018] [Indexed: 11/22/2022] Open
Abstract
Considering the short shelf-life of certain food products such as red meat, there is a need for rapid and cost-effective methods for pathogen detection. Routine pathogen testing in food laboratories mostly relies on conventional microbiological methods which involve the use of multiple selective culture media and long incubation periods, often taking up to 7 days for confirmed identifications. The current study investigated the application of omics-based approaches, proteomics using matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-ToF MS) and metabolomics using gas chromatography-mass spectrometry (GC-MS), for detection of three red meat pathogens - Listeria monocytogenes, Salmonella enterica and Escherichia coli O157:H7. Species-level identification was achieved within 18 h for S. enterica and E. coli O157:H7 and 30 h for L. monocytogenes using MALDI-ToF MS analysis. For the metabolomics approach, metabolites were extracted directly from selective enrichment broth samples containing spiked meat samples (obviating the need for culturing on solid media) and data obtained using GC-MS were analyzed using chemometric methods. Putative biomarkers relating to L. monocytogenes, S. enterica and E. coli O157:H7 were observed within 24, 18, and 12 h, respectively, of inoculating meat samples. Many of the identified metabolites were sugars, fatty acids, amino acids, nucleosides and organic acids. Secondary metabolites such as cadaverine, hydroxymelatonin and 3,4-dihydroxymadelic acid were also observed. The results obtained in this study will assist in the future development of rapid diagnostic tests for these important foodborne pathogens.
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Affiliation(s)
- Snehal R. Jadhav
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Melbourne, VIC, Australia
| | - Rohan M. Shah
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Melbourne, VIC, Australia
| | - Avinash V. Karpe
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Melbourne, VIC, Australia
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Brisbane, QLD, Australia
| | - Paul D. Morrison
- Australian Centre for Research on Separation Science, RMIT University, Melbourne, VIC, Australia
| | - Konstantinos Kouremenos
- Metabolomics Australia, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Melbourne, VIC, Australia
| | - David J. Beale
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, Brisbane, QLD, Australia
| | - Enzo A. Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Melbourne, VIC, Australia
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30
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Beale DJ, Crosswell J, Karpe AV, Metcalfe SS, Morrison PD, Staley C, Ahmed W, Sadowsky MJ, Palombo EA, Steven ADL. Seasonal metabolic analysis of marine sediments collected from Moreton Bay in South East Queensland, Australia, using a multi-omics-based approach. Sci Total Environ 2018; 631-632:1328-1341. [PMID: 29727957 DOI: 10.1016/j.scitotenv.2018.03.106] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 03/06/2018] [Accepted: 03/09/2018] [Indexed: 06/08/2023]
Abstract
Anthropogenic effects of urban density have altered natural ecosystems. Such changes include eutrophication of freshwater and adjoining coastal habitats, and increased levels of inorganic nutrients and pollutants into waterways. In Australia, these changes are intensified by large-scale ocean-atmospheric events, leading to considerable abiotic stress on the natural flora and fauna. Bacterial communities in marine sediments from Moreton Bay (South East Queensland, Australia) were examined in order to assess the impact of rainfall changes, chemical pollution, and subsequent abiotic stress on living organisms within a marine ecosystem. Sediments were collected during the wet and dry seasons and analyzed using bacterial metagenomics and community metabolomics techniques. Physicochemical data were also analyzed to account for biological variance that may be due to non-rainfall-based abiotic stresses. Wet-dry seasonality was the dominant control on bacterial community structure and metabolic function. Changes in the availability of nutrients, organic matter and light appeared to be the major seasonal stressors. In contrast, urban and industrial pollutants appeared to be minor stressors at the sites sampled. During the wet season, the bacterial community composition reflected organisms that utilize biogeochemical pathways with fast kinetics, such as aerobic metabolism, direct assimilation of inorganic compounds, and primary production. The transition to the dry season saw the bacterial community composition shift towards organisms that utilize more complex organic energy sources, such as carbohydrates and fatty acids, and anaerobic redox processes.
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Affiliation(s)
- D J Beale
- CSIRO Land & Water, Ecosciences Precinct, Dutton Park, QLD 4102, Australia.
| | - J Crosswell
- CSIRO Oceans & Atmosphere, Ecosciences Precinct, Dutton Park, QLD 4102, Australia.
| | - A V Karpe
- CSIRO Land & Water, Ecosciences Precinct, Dutton Park, QLD 4102, Australia.
| | - S S Metcalfe
- CSIRO Land & Water, Ecosciences Precinct, Dutton Park, QLD 4102, Australia.
| | - P D Morrison
- Australian Centre for Research on Separation Science, School of Applied Sciences, RMIT University, Melbourne, VIC 3001, Australia.
| | - C Staley
- Biotechnology Institute, University of Minnesota, St. Paul, MN, United States.
| | - W Ahmed
- CSIRO Land & Water, Ecosciences Precinct, Dutton Park, QLD 4102, Australia.
| | - M J Sadowsky
- Biotechnology Institute, University of Minnesota, St. Paul, MN, United States.
| | - E A Palombo
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
| | - A D L Steven
- CSIRO Oceans & Atmosphere, Ecosciences Precinct, Dutton Park, QLD 4102, Australia.
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Topa SH, Subramoni S, Palombo EA, Kingshott P, Rice SA, Blackall LL. Cinnamaldehyde disrupts biofilm formation and swarming motility of Pseudomonas aeruginosa. Microbiology (Reading) 2018; 164:1087-1097. [PMID: 29993359 DOI: 10.1099/mic.0.000692] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Bacterial biofilms can cause serious health care complications associated with increased morbidity and mortality. There is an urge to discover and develop new biofilm inhibitors from natural products or by modifying natural compounds or understanding the modes of action of existing compounds. Cinnamaldehyde (CAD), one of the major components of cinnamon oil, has been demonstrated to act as an antimicrobial agent against a number of Gram-negative and Gram-positive pathogens, including Pseudomonas aeruginosa, Helicobacter pylori and Listeria monocytogenes. Despite the mechanism of action of CAD against the model organism P. aeruginosa being undefined, based on its antimicrobial properties, we hypothesized that it may disrupt preformed biofilms of P. aeruginosa. The minimum inhibitory concentration (MIC) of CAD for planktonic P. aeruginosa was determined to be 11.8 mM. Membrane depolarization assays demonstrated disruption of the transmembrane potential of P. aeruginosa. CAD at 5.9 mM (0.5 MIC) disrupted preformed biofilms by 75.6 % and 3 mM CAD (0.25 MIC) reduced the intracellular concentrations of the secondary messenger, bis-(3'-5')-cyclic dimeric guanosine monophosphate (c-di-GMP), which controls P. aeruginosa biofilm formation. The swarming motility of P. aeruginosa was also reduced by CAD in a concentration-dependent manner. Collectively, these findings show that sub-MICs of CAD can disrupt biofilms and other surface colonization phenotypes through the modulation of intracellular signalling processes.
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Affiliation(s)
- Sanjida Halim Topa
- 1Department of Chemistry and Biotechnology, School of Science, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Sujatha Subramoni
- 2Singapore Centre for Environmental Life Sciences Engineering (SCELSE), Nanyang Technological University, Nanyang Avenue, Singapore
| | - Enzo A Palombo
- 1Department of Chemistry and Biotechnology, School of Science, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Peter Kingshott
- 1Department of Chemistry and Biotechnology, School of Science, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Scott A Rice
- 2Singapore Centre for Environmental Life Sciences Engineering (SCELSE), Nanyang Technological University, Nanyang Avenue, Singapore.,3The School of Biological Sciences, Nanyang Technological University, Nanyang Avenue, Singapore.,4The ithree Institute, The University of Technology Sydney, Sydney, Australia
| | - Linda L Blackall
- 1Department of Chemistry and Biotechnology, School of Science, Swinburne University of Technology, Hawthorn, Victoria, Australia.,5School of BioSciences, The University of Melbourne, Parkville, Victoria, Australia
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Zaferanloo B, Pepper SA, Coulthard SA, Redfern CPF, Palombo EA. Metabolites of endophytic fungi from Australian native plants as potential anticancer agents. FEMS Microbiol Lett 2018; 365:4953740. [DOI: 10.1093/femsle/fny078] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 03/25/2018] [Indexed: 01/09/2023] Open
Affiliation(s)
- Bita Zaferanloo
- Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn 3122, Australia
| | - Stephanie A Pepper
- The Newcastle Cancer Centre, Northern Institute for Cancer Research, Newcastle University, Newcastle NE2 4HH, UK
| | - Sally A Coulthard
- The Newcastle Cancer Centre, Northern Institute for Cancer Research, Newcastle University, Newcastle NE2 4HH, UK
| | - Christopher P F Redfern
- The Newcastle Cancer Centre, Northern Institute for Cancer Research, Newcastle University, Newcastle NE2 4HH, UK
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn 3122, Australia
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Beale DJ, Crosswell J, Karpe AV, Ahmed W, Williams M, Morrison PD, Metcalfe S, Staley C, Sadowsky MJ, Palombo EA, Steven ADL. A multi-omics based ecological analysis of coastal marine sediments from Gladstone, in Australia's Central Queensland, and Heron Island, a nearby fringing platform reef. Sci Total Environ 2017; 609:842-853. [PMID: 28768216 DOI: 10.1016/j.scitotenv.2017.07.184] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 07/19/2017] [Accepted: 07/20/2017] [Indexed: 06/07/2023]
Abstract
The impact of anthropogenic factors arising from point and non-point pollution sources at a multi commodity marine port and its surrounding ecosystems were studied using sediment samples collected from a number of onshore (Gladstone Harbour and Facing Island) and offshore (Heron Island and Fitzroy Reefs) sites in Australia's Central Queensland. Sediment samples were analyzed for trace metals, organic carbon, polycyclic aromatic hydrocarbons (PAH), emerging chemicals of concern (ECC) and sterols. Similarly, the biological and biochemical interaction between the reef and its environment was analyzed by the multi-omic tools of next-generation sequencing characterization of the bacterial community and microbial community metabolic profiling. Overall, the trace elements were observed at the lower end of the Australian environmental guideline values at the offshore sites, while higher values were observed for the onshore locations Nickel and copper were observed above the high trigger value threshold at the onshore sites. The levels of PAH were below limits of detection across all sites. However, some of the ECC and sterols were observed at higher concentrations at both onshore and offshore locations, notably, the cholesterol family sterols and 17α-ethynylestradiol. Multi-omic analyses also indicated possible thermal and photo irradiation stressors on the bacterial communities at all the tested sites. The observed populations of γ-proteobacteria were found in combination with an increased pool of fatty acids that indicate fatty acid synthesis and utilisation of the intermediates of the shikimate pathways. This study demonstrates the value of applying a multi-omics approach for ecological assessments, in which a more detailed assessment of physical and chemical contaminants and their impact on the community bacterial biome is obtained.
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Affiliation(s)
- D J Beale
- CSIRO Land & Water, Ecosciences Precinct, Dutton Park, QLD 4102, Australia.
| | - J Crosswell
- CSIRO Oceans & Atmosphere, Ecosciences Precinct, Dutton Park, QLD 4102, Australia.
| | - A V Karpe
- CSIRO Land & Water, Ecosciences Precinct, Dutton Park, QLD 4102, Australia; Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
| | - W Ahmed
- CSIRO Land & Water, Ecosciences Precinct, Dutton Park, QLD 4102, Australia.
| | - M Williams
- CSIRO Land & Water, Waite Campus, Urrbrae, SA 5064, Australia.
| | - P D Morrison
- Australian Centre for Research on Separation Science, School of Applied Sciences, RMIT University, Melbourne, VIC 3001, Australia.
| | - S Metcalfe
- CSIRO Land & Water, Ecosciences Precinct, Dutton Park, QLD 4102, Australia.
| | - C Staley
- Biotechnology Institute, University of Minnesota, St. Paul, MN, United States.
| | - M J Sadowsky
- Biotechnology Institute, University of Minnesota, St. Paul, MN, United States.
| | - E A Palombo
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
| | - A D L Steven
- CSIRO Oceans & Atmosphere, Ecosciences Precinct, Dutton Park, QLD 4102, Australia.
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Shah RM, Eldridge DS, Palombo EA, Harding IH. Microwave-assisted microemulsion technique for production of miconazole nitrate- and econazole nitrate-loaded solid lipid nanoparticles. Eur J Pharm Biopharm 2017; 117:141-150. [DOI: 10.1016/j.ejpb.2017.04.007] [Citation(s) in RCA: 24] [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] [Received: 01/23/2016] [Revised: 11/23/2016] [Accepted: 04/10/2017] [Indexed: 11/30/2022]
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Vithanage NR, Bhongir J, Jadhav SR, Ranadheera CS, Palombo EA, Yeager TR, Datta N. Species-Level Discrimination of Psychrotrophic Pathogenic and Spoilage Gram-Negative Raw Milk Isolates Using a Combined MALDI-TOF MS Proteomics–Bioinformatics-based Approach. J Proteome Res 2017; 16:2188-2203. [DOI: 10.1021/acs.jproteome.6b01046] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Nuwan R. Vithanage
- College
of Health and Biomedicine, Victoria University, Werribee, Victoria 3030, Australia
- Advanced
Food Systems, Victoria University, Werribee, Victoria 3030, Australia
| | - Jeevana Bhongir
- College
of Health and Biomedicine, Victoria University, Werribee, Victoria 3030, Australia
| | - Snehal R. Jadhav
- Faculty
of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Chaminda S. Ranadheera
- College
of Health and Biomedicine, Victoria University, Werribee, Victoria 3030, Australia
- Advanced
Food Systems, Victoria University, Werribee, Victoria 3030, Australia
| | - Enzo A. Palombo
- Faculty
of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Thomas R. Yeager
- College
of Engineering and Science, Victoria University, Melbourne, Victoria 8001, Australia
- Institute
for Sustainability and Innovation, Victoria University, Werribee, Victoria 3030, Australia
- Advanced
Food Systems, Victoria University, Werribee, Victoria 3030, Australia
| | - Nivedita Datta
- College
of Health and Biomedicine, Victoria University, Werribee, Victoria 3030, Australia
- Institute
for Sustainability and Innovation, Victoria University, Werribee, Victoria 3030, Australia
- Advanced
Food Systems, Victoria University, Werribee, Victoria 3030, Australia
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Karpe AV, Dhamale VV, Morrison PD, Beale DJ, Harding IH, Palombo EA. Winery biomass waste degradation by sequential sonication and mixed fungal enzyme treatments. Fungal Genet Biol 2017; 102:22-30. [DOI: 10.1016/j.fgb.2016.08.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 08/25/2016] [Accepted: 08/30/2016] [Indexed: 11/25/2022]
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Galappathie S, Edwards DJ, Elliott AG, Cooper MA, Palombo EA, Butler MS, Mahon PJ. Antibacterial Nerol Cinnamates from the Australian Plant Eremophila longifolia. J Nat Prod 2017; 80:1178-1181. [PMID: 28257200 DOI: 10.1021/acs.jnatprod.6b00888] [Citation(s) in RCA: 6] [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] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Two new antimicrobial agents, neryl ferulate (1) and neryl p-coumarate (2), were identified using bioassay-guided isolation from the leaves of Eremophila longifolia, which is a medicinal plant used by some Australian Aboriginal communities. Although gradual autoxidation of the nerol subunit hindered the initial attempts to purify and characterize 1 and 2, it was found that the autoxidation could be stopped through storage under argon at -20 °C. Biological evaluation showed that neryl ferulate (1) had moderate activity against various Gram-positive bacteria, while neryl p-coumarate (2) was active only against Enterococcus faecium.
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Affiliation(s)
- Savithri Galappathie
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn 3122, Victoria, Australia
| | - David J Edwards
- Institute for Molecular Bioscience, University of Queensland , St Lucia 4072, Queensland, Australia
| | - Alysha G Elliott
- Institute for Molecular Bioscience, University of Queensland , St Lucia 4072, Queensland, Australia
| | - Matthew A Cooper
- Institute for Molecular Bioscience, University of Queensland , St Lucia 4072, Queensland, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn 3122, Victoria, Australia
| | - Mark S Butler
- Institute for Molecular Bioscience, University of Queensland , St Lucia 4072, Queensland, Australia
| | - Peter J Mahon
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn 3122, Victoria, Australia
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Beale DJ, Jones OAH, Karpe AV, Dayalan S, Oh DY, Kouremenos KA, Ahmed W, Palombo EA. A Review of Analytical Techniques and Their Application in Disease Diagnosis in Breathomics and Salivaomics Research. Int J Mol Sci 2016; 18:E24. [PMID: 28025547 PMCID: PMC5297659 DOI: 10.3390/ijms18010024] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [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: 11/01/2016] [Revised: 12/12/2016] [Accepted: 12/16/2016] [Indexed: 12/14/2022] Open
Abstract
The application of metabolomics to biological samples has been a key focus in systems biology research, which is aimed at the development of rapid diagnostic methods and the creation of personalized medicine. More recently, there has been a strong focus towards this approach applied to non-invasively acquired samples, such as saliva and exhaled breath. The analysis of these biological samples, in conjunction with other sample types and traditional diagnostic tests, has resulted in faster and more reliable characterization of a range of health disorders and diseases. As the sampling process involved in collecting exhaled breath and saliva is non-intrusive as well as comparatively low-cost and uses a series of widely accepted methods, it provides researchers with easy access to the metabolites secreted by the human body. Owing to its accuracy and rapid nature, metabolomic analysis of saliva and breath (known as salivaomics and breathomics, respectively) is a rapidly growing field and has shown potential to be effective in detecting and diagnosing the early stages of numerous diseases and infections in preclinical studies. This review discusses the various collection and analyses methods currently applied in two of the least used non-invasive sample types in metabolomics, specifically their application in salivaomics and breathomics research. Some of the salient research completed in this field to date is also assessed and discussed in order to provide a basis to advocate their use and possible future scientific directions.
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Affiliation(s)
- David J Beale
- Commonwealth Scientific & Industrial Research Organization (CSIRO), Land & Water, P.O. Box 2583, Brisbane, QLD 4001, Australia.
| | - Oliver A H Jones
- Australian Centre for Research on Separation Science, School of Science, RMIT University, P.O. Box 2547, Melbourne, VIC 3001, Australia.
| | - Avinash V Karpe
- Commonwealth Scientific & Industrial Research Organization (CSIRO), Land & Water, P.O. Box 2583, Brisbane, QLD 4001, Australia.
- Department of Chemistry and Biotechnology, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia.
| | - Saravanan Dayalan
- Metabolomics Australia, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, 30 Flemington Road, Parkville, VIC 3010, Australia.
| | - Ding Yuan Oh
- WHO Collaborating Centre for Reference and Research on Influenza (VIDRL), Peter Doherty Institute for Infection and Immunity, 792 Elizabeth Street, Melbourne, VIC 3000, Australia.
- School of Applied and Biomedical Sciences, Federation University, Churchill, VIC 3350, Australia.
| | - Konstantinos A Kouremenos
- Metabolomics Australia, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, 30 Flemington Road, Parkville, VIC 3010, Australia.
| | - Warish Ahmed
- Commonwealth Scientific & Industrial Research Organization (CSIRO), Land & Water, P.O. Box 2583, Brisbane, QLD 4001, Australia.
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia.
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Shah RM, Eldridge DS, Palombo EA, Harding IH. Microwave-assisted formulation of solid lipid nanoparticles loaded with non-steroidal anti-inflammatory drugs. Int J Pharm 2016; 515:543-554. [DOI: 10.1016/j.ijpharm.2016.10.054] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 09/30/2016] [Accepted: 10/24/2016] [Indexed: 01/21/2023]
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Kumarasingha R, Karpe AV, Preston S, Yeo TC, Lim DSL, Tu CL, Luu J, Simpson KJ, Shaw JM, Gasser RB, Beale DJ, Morrison PD, Palombo EA, Boag PR. Metabolic profiling and in vitro assessment of anthelmintic fractions of Picria fel-terrae Lour. Int J Parasitol Drugs Drug Resist 2016; 6:171-178. [PMID: 27639945 PMCID: PMC5030326 DOI: 10.1016/j.ijpddr.2016.08.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2015] [Revised: 08/19/2016] [Accepted: 08/22/2016] [Indexed: 12/31/2022]
Abstract
Anthelmintic resistance is widespread in gastrointestinal nematode populations, such that there is a consistent need to search for new anthelmintics. However, the cost of screening for new compounds is high and has a very low success rate. Using the knowledge of traditional healers from Borneo Rainforests (Sarawak, Malaysia), we have previously shown that some traditional medicinal plants are a rich source of potential new anthelmintic drug candidates. In this study, Picria fel-terrae Lour. plant extract, which has previously shown promising anthelmintic activities, was fractionated via the use of a solid phase extraction cartridge and each isolated fraction was then tested on free-living nematode Caenorhabditis elegans and the parasitic nematode Haemonchus contortus. We found that a single fraction was enriched for nematocidal activity, killing ≥90% of C. elegans adults and inhibiting the motility of exsheathed L3 of H. contortus, while having minimal cytotoxic activity in mammalian cell culture. Metabolic profiling and chemometric analysis of the effective fraction indicated medium chained fatty acids and phenolic acids were highly represented. Chemical fractionation of Picria fel-terrae Lour. plant extract. Anthelmintic activity against Caenorhabditis elegans and Haemonchus contortus. Metabolic profiling and chemometric analysis of active fraction. Active fraction has minimal mammalian cytotoxicity.
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Affiliation(s)
- Rasika Kumarasingha
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, Victoria, 3800, Australia
| | - Avinash V Karpe
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, 3122, Victoria, Australia; Land and Water, Commonwealth Scientific and Industrial Research Organization (CSIRO), Ecosciences Precinct, Dutton Park, 4102, Queensland, Australia
| | - Sarah Preston
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, 3010, Victoria, Australia
| | - Tiong-Chia Yeo
- Sarawak Biodiversity Centre (SBC), KM 20 Jalan Borneo Heights, Semengoh, Locked Bag No. 3032, 93990, Kuching, Sarawak, Malaysia
| | - Diana S L Lim
- Sarawak Biodiversity Centre (SBC), KM 20 Jalan Borneo Heights, Semengoh, Locked Bag No. 3032, 93990, Kuching, Sarawak, Malaysia
| | - Chu-Lee Tu
- Sarawak Biodiversity Centre (SBC), KM 20 Jalan Borneo Heights, Semengoh, Locked Bag No. 3032, 93990, Kuching, Sarawak, Malaysia
| | - Jennii Luu
- Victorian Centre for Functional Genomics, Peter MacCallum Cancer Centre, East Melbourne, 3002, Victoria, Australia
| | - Kaylene J Simpson
- Victorian Centre for Functional Genomics, Peter MacCallum Cancer Centre, East Melbourne, 3002, Victoria, Australia; The Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, 3052, Victoria, Australia
| | - Jillian M Shaw
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, 3122, Victoria, Australia
| | - Robin B Gasser
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, 3010, Victoria, Australia
| | - David J Beale
- Land and Water, Commonwealth Scientific and Industrial Research Organization (CSIRO), Ecosciences Precinct, Dutton Park, 4102, Queensland, Australia
| | - Paul D Morrison
- Australian Centre for Research on Separation Science (ACROSS), School of Applied Sciences, RMIT University, Melbourne, 3001, Victoria, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, 3122, Victoria, Australia
| | - Peter R Boag
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, Victoria, 3800, Australia; Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, 3010, Victoria, Australia.
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Burton MG, Huang QM, Hossain MA, Wade JD, Palombo EA, Gee ML, Clayton AHA. Direct Measurement of Pore Dynamics and Leakage Induced by a Model Antimicrobial Peptide in Single Vesicles and Cells. Langmuir 2016; 32:6496-6505. [PMID: 27281288 DOI: 10.1021/acs.langmuir.6b00596] [Citation(s) in RCA: 5] [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] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Antimicrobial peptides are promising therapeutic alternatives to counter growing antimicrobial resistance. Their precise mechanism of action remains elusive, however, particularly with respect to live bacterial cells. We investigated the interaction of a fluorescent melittin analogue with single giant unilamellar vesicles, giant multilamellar vesicles, and bilamellar Gram-negative Escherichia coli (E. coli) bacteria. Time-lapse fluorescence lifetime imaging microscopy was employed to determine the population distribution of the fluorescent melittin analogue between pore state and membrane surface state, and simultaneously measure the leakage of entrapped fluorescent species from the vesicle (or bacterium) interior. In giant unilamellar vesicles, leakage from vesicle interior was correlated with an increase in level of pore states, consistent with a stable pore formation mechanism. In giant multilamellar vesicles, vesicle leakage occurred more gradually and did not appear to correlate with increased pore states. Instead pore levels remained at a low steady-state level, which is more in line with coupled equilibria. Finally, in single bacterial cells, significant increases in pore levels were observed over time, which were correlated with only partial loss of cytosolic contents. These observations suggested that pore formation, as opposed to complete dissolution of membrane, was responsible for the leakage of contents in these systems, and that the bacterial membrane has an adaptive capacity that resists peptide attack. We interpret the three distinct pore dynamics regimes in the context of the increasing physical and biological complexity of the membranes.
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Affiliation(s)
| | | | | | | | - Enzo A Palombo
- Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn, Victoria 3122, Australia
| | | | - Andrew H A Clayton
- Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn, Victoria 3122, Australia
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Shagaghi N, Alfred RL, Clayton AHA, Palombo EA, Bhave M. Anti-biofilm and sporicidal activity of peptides based on wheat puroindoline and barley hordoindoline proteins. J Pept Sci 2016; 22:492-500. [PMID: 27238815 DOI: 10.1002/psc.2895] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 04/10/2016] [Accepted: 04/14/2016] [Indexed: 11/11/2022]
Abstract
The broad-spectrum activity of antimicrobial peptides (AMPs) and low probability of development of host resistance make them excellent candidates as novel bio-control agents. A number of AMPs are found to be cationic, and a small proportion of these are tryptophan-rich. The puroindolines (PIN) are small, basic proteins found in wheat grains with proposed roles in biotic defence of seeds and seedlings. Synthetic peptides based on their unique tryptophan-rich domain (TRD) display antimicrobial properties. Bacterial endospores and biofilms are highly resistant cells, with significant implications in both medical and food industries. In this study, the cationic PIN TRD-based peptides PuroA (FPVTWRWWKWWKG-NH2 ) and Pina-M (FSVTWRWWKWWKG-NH2 ) and the related barley hordoindoline (HIN) based Hina (FPVTWRWWTWWKG-NH2 ) were tested for effects on planktonic cells and biofilms of the common human pathogens including Pseudomonas aeruginosa, Listeria monocytogenes and the non-pathogenic Listeria innocua. All peptides showed significant bactericidal activity. Further, PuroA and Pina-M at 2 × MIC prevented initial biomass attachment by 85-90% and inhibited >90% of 6-h preformed biofilms of all three organisms. However Hina, with a substitution of Lys-9 with uncharged Thr, particularly inhibited Listeria biofilms. The PIN based peptides were also tested against vegetative cells and endospores of Bacillus subtilis. The results provided evidence that these tryptophan-rich peptides could kill B. subtilis even in sporulated state, reducing the number of viable spores by 4 log units. The treated spores appeared withered under scanning electron microscopy. The results establish the potential of these tryptophan-rich peptides in controlling persistent pathogens of relevance to food industries and human health. Copyright © 2016 European Peptide Society and John Wiley & Sons, Ltd.
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Affiliation(s)
- Nadin Shagaghi
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, John Street, Hawthorn, VIC, 3122, Australia
| | - Rebecca L Alfred
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, John Street, Hawthorn, VIC, 3122, Australia
| | - Andrew H A Clayton
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, John Street, Hawthorn, VIC, 3122, Australia
| | - Enzo A Palombo
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, John Street, Hawthorn, VIC, 3122, Australia
| | - Mrinal Bhave
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, John Street, Hawthorn, VIC, 3122, Australia
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Gyawali P, Beale DJ, Ahmed W, Karpe AV, Magalhaes RJS, Morrison PD, Palombo EA. Determination of Ancylostoma caninum ova viability using metabolic profiling. Parasitol Res 2016; 115:3485-92. [PMID: 27236650 DOI: 10.1007/s00436-016-5112-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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: 04/21/2016] [Accepted: 05/04/2016] [Indexed: 01/05/2023]
Abstract
Differentiation between viable and non-viable hookworm ova in environmental samples is necessary in order to implement strategies to mitigate re-infections in endemic regions. In this study, an untargeted metabolic profiling method was developed that utilised gas chromatography-mass spectrometry (GC-MS) in order to investigate hookworm ova viability. Ancylostoma caninum was used to investigate the metabolites within viable and non-viable ova. Univariate and multivariate statistical analyses of the data resulted in the identification of 53 significant metabolites across all hookworm ova samples. The major compounds observed in viable and non-viable hookworm ova were tetradecanoic acid, commonly known as myristic acid [fold change (FC) = 0.4], and dodecanoic acid, commonly known as lauric acid (FC = 0.388). Additionally, the viable ova had self-protecting metabolites such as prostaglandins, a typical feature absent in non-viable ova. The results of this study demonstrate that metabolic profiling using GC-MS methods can be used to determine the viability of canine hookworm ova. Further studies are needed to assess the applicability of metabolic profiling using GC-MS to detect viable hookworm ova in the mixed (viable and non-viable) populations from environmental samples and identify the metabolites specific to human hookworm species.
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Affiliation(s)
- P Gyawali
- CSIRO Land and Water, Ecosciences Precinct, 41 Boggo Road, Brisbane, Queensland, 4102, Australia. .,School of Public Health, University of Queensland, Herston Road, Brisbane, Queensland, 4006, Australia.
| | - D J Beale
- CSIRO Land and Water, Ecosciences Precinct, 41 Boggo Road, Brisbane, Queensland, 4102, Australia
| | - W Ahmed
- CSIRO Land and Water, Ecosciences Precinct, 41 Boggo Road, Brisbane, Queensland, 4102, Australia
| | - A V Karpe
- CSIRO Land and Water, Ecosciences Precinct, 41 Boggo Road, Brisbane, Queensland, 4102, Australia.,Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Victoria, 3122, Australia
| | - R J Soares Magalhaes
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, 4343, Australia.,Children's Health Research Centre, The University of Queensland, South Brisbane, Queensland, 4101, Australia
| | - P D Morrison
- Australian Centre for Research on Separation Science (ACROSS), School of Applied Sciences, RMIT University, Melbourne, Victoria, 3001, Australia
| | - E A Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, Victoria, 3122, Australia
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Kumarasingha R, Preston S, Yeo TC, Lim DSL, Tu CL, Palombo EA, Shaw JM, Gasser RB, Boag PR. Anthelmintic activity of selected ethno-medicinal plant extracts on parasitic stages of Haemonchus contortus. Parasit Vectors 2016; 9:187. [PMID: 27036205 PMCID: PMC4818492 DOI: 10.1186/s13071-016-1458-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [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: 11/27/2015] [Accepted: 03/16/2016] [Indexed: 12/16/2022] Open
Abstract
Background Parasitic roundworms (nematodes) cause substantial morbidity and mortality in livestock animals globally, and considerable productivity losses to farmers. The control of these nematodes has relied largely on the use of a limited number of anthelmintics. However, resistance to many of these these anthelmintics is now widespread, and, therefore, there is a need to find new drugs to ensure sustained and effective treatment and control into the future. Methods Recently, we developed a screening assay to test natural, plant extracts with known inhibitory effects against the free-living worm Caenorhabditis elegans. Using this assay, we assessed here the effects of the extracts on motility and development of parasitic larval stages of Haemonchus contortus, one of the most important nematodes of small ruminants worldwide. Results The study showed that two of five extracts from Picria fel-terrae Lour. have a significant inhibitory effect (at concentrations of 3–5 mg/ml) on the motility and development of H. contortus larvae. Although the two extracts originated from the same plant, they displayed different levels of inhibition on motility and development, which might relate to the presence of various active constituents in these extracts, or the same constituents at different concentrations in distinct parts of the plant. Conclusions These results suggest that extracts from P. fel-terrae Lour. have promising anthelmintic activity and that more broadly, plant extracts are a potential rich source of anthelmintics to combat helminthic diseases.
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Affiliation(s)
- Rasika Kumarasingha
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC, 3800, Australia
| | - Sarah Preston
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia
| | - Tiong-Chia Yeo
- Sarawak Biodiversity Centre (SBC), KM 20 Jalan Borneo Heights, Semengoh, Locked Bag No. 3032, 93990, Kuching, Sarawak, Malaysia
| | - Diana S L Lim
- Sarawak Biodiversity Centre (SBC), KM 20 Jalan Borneo Heights, Semengoh, Locked Bag No. 3032, 93990, Kuching, Sarawak, Malaysia
| | - Chu-Lee Tu
- Sarawak Biodiversity Centre (SBC), KM 20 Jalan Borneo Heights, Semengoh, Locked Bag No. 3032, 93990, Kuching, Sarawak, Malaysia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Victoria, 3122, Australia
| | - Jillian M Shaw
- Department of Health and Medical Sciences, Faculty of Health, Arts and Design, Swinburne University of Technology, Victoria, 3122, Australia
| | - Robin B Gasser
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia.
| | - Peter R Boag
- Development and Stem Cells Program, Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC, 3800, Australia. .,Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia.
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Shagaghi N, Palombo EA, Clayton AHA, Bhave M. Archetypal tryptophan-rich antimicrobial peptides: properties and applications. World J Microbiol Biotechnol 2016; 32:31. [PMID: 26748808 DOI: 10.1007/s11274-015-1986-z] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [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: 09/26/2015] [Accepted: 11/25/2015] [Indexed: 12/17/2022]
Abstract
Drug-resistant microorganisms ('superbugs') present a serious challenge to the success of antimicrobial treatments. Subsequently, there is a crucial need for novel bio-control agents. Many antimicrobial peptides (AMPs) show a broad-spectrum activity against bacteria, fungi or viruses and are strong candidates to complement or substitute current antimicrobial agents. Some AMPs are also effective against protozoa or cancer cells. The tryptophan (Trp)-rich peptides (TRPs) are a subset of AMPs that display potent antimicrobial activity, credited to the unique biochemical properties of tryptophan that allow it to insert into biological membranes. Further, many Trp-rich AMPs cross bacterial membranes without compromising their integrity and act intracellularly, suggesting interactions with nucleic acids and enzymes. In this work, we overview some archetypal TRPs derived from natural sources, i.e., indolicidin, tritrpticin and lactoferricin, summarising their biochemical properties, structures, antimicrobial activities, mechanistic studies and potential applications.
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Affiliation(s)
- Nadin Shagaghi
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC, 3122, Australia
| | - Enzo A Palombo
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC, 3122, Australia
| | - Andrew H A Clayton
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC, 3122, Australia
| | - Mrinal Bhave
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC, 3122, Australia.
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Shah RM, Bryant G, Taylor M, Eldridge DS, Palombo EA, Harding IH. Structure of solid lipid nanoparticles produced by a microwave-assisted microemulsion technique. RSC Adv 2016. [DOI: 10.1039/c6ra02020h] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The current study investigates the structure of solid lipid nanoparticles, prepared using a recently reported microwave-assisted microemulsion technique, by multi-angle static and dynamic light scattering and small angle X-ray scattering techniques.
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Affiliation(s)
- Rohan M. Shah
- Department of Chemistry and Biotechnology
- Faculty of Science
- Engineering and Technology
- Swinburne University of Technology
- Melbourne
| | - Gary Bryant
- Centre for Molecular and Nanoscale Physics (NanoPHYS)
- School of Applied Sciences
- RMIT University
- Melbourne
- Australia
| | - Matthew Taylor
- Centre for Molecular and Nanoscale Physics (NanoPHYS)
- School of Applied Sciences
- RMIT University
- Melbourne
- Australia
| | - Daniel S. Eldridge
- Department of Chemistry and Biotechnology
- Faculty of Science
- Engineering and Technology
- Swinburne University of Technology
- Melbourne
| | - Enzo A. Palombo
- Department of Chemistry and Biotechnology
- Faculty of Science
- Engineering and Technology
- Swinburne University of Technology
- Melbourne
| | - Ian H. Harding
- Department of Chemistry and Biotechnology
- Faculty of Science
- Engineering and Technology
- Swinburne University of Technology
- Melbourne
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Beale DJ, Karpe AV, McLeod JD, Gondalia SV, Muster TH, Othman MZ, Palombo EA, Joshi D. An 'omics' approach towards the characterisation of laboratory scale anaerobic digesters treating municipal sewage sludge. Water Res 2016; 88:346-357. [PMID: 26512813 DOI: 10.1016/j.watres.2015.10.029] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 10/12/2015] [Accepted: 10/17/2015] [Indexed: 06/05/2023]
Abstract
In this study, laboratory scale digesters were operated to simulate potential shocks to the Anaerobic Digestion (AD) process at a 350 ML/day wastewater treatment plant. The shocks included high (42 °C) and low (32 °C) temperature (either side of mesophilic 37 °C) and a 20% loading of fats, oil and grease (FOG; 20% w:v). These variables were explored at two sludge retention times (12 and 20 days) and two organic loading rates (2.0 and 2.5 kgTS/m(3)day OLR). Metagenomic and metabolomic approaches were then used to characterise the impact of operational shocks in regard to temperature and FOG addition, as determined through monitoring of biogas production, the microbial profile and their metabolism. Results showed that AD performance was not greatly affected by temperature shocks, with the biggest impact being a reduction in biogas production at 42 °C that persisted for 32 ± 1 days. The average biogas production across all digesters at the completion of the experiment was 264.1 ± 76.5 mL/day, with FOG addition observed to significantly promote biogas production (+87.8 mL/day). Metagenomic and metabolomic analyses of the digesters indicated that methanogens and methane oxidising bacteria (MOB) were low in relative abundance, and that the ratio of oxidising bacteria (methane, sulphide and sulphate) with respect to sulphate reducing bacteria (SRB) had a noticeable influence on biogas production. Furthermore, increased biogas production correlated with an increase in short chain fatty acids, a product of the addition of 20% FOG. This work demonstrates the application of metagenomics and metabolomics to characterise the microbiota and their metabolism in AD digesters, providing insight to the resilience of crucial microbial populations when exposed to operational shocks.
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Affiliation(s)
- D J Beale
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, PO Box 2583, Brisbane, Queensland 4001, Australia.
| | - A V Karpe
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, PO Box 2583, Brisbane, Queensland 4001, Australia; Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia
| | - J D McLeod
- School of Civil, Environmental and Chemical Engineering, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
| | - S V Gondalia
- Centre for Human Psychopharmacology, Faculty of Health, Arts and Design, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia
| | - T H Muster
- Land and Water, Commonwealth Scientific and Industrial Research Organisation, PO Box 2583, Brisbane, Queensland 4001, Australia
| | - M Z Othman
- School of Civil, Environmental and Chemical Engineering, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
| | - E A Palombo
- Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia
| | - D Joshi
- Melbourne Water, PO Box 4342, Melbourne, Victoria 3001, Australia
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Shah RM, Rajasekaran D, Ludford-Menting M, Eldridge DS, Palombo EA, Harding IH. Transport of stearic acid-based solid lipid nanoparticles (SLNs) into human epithelial cells. Colloids Surf B Biointerfaces 2015; 140:204-212. [PMID: 26764103 DOI: 10.1016/j.colsurfb.2015.12.029] [Citation(s) in RCA: 38] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 12/14/2015] [Accepted: 12/15/2015] [Indexed: 11/26/2022]
Abstract
Development of drug delivery systems, as much as the drug molecule itself, is an important consideration for improving drug absorption and bioavailability. The mechanisms by which drug carriers enter target cells can differ depending on their size, surface properties and components. Solid lipid nanoparticles (SLNs) have gained an increased attention in recent years and are the drug carriers of interest in this paper. They are known to breach the cell-membrane barrier and have been actively sought to transport biomolecules. Previous studies by our group, and also other groups, provided an extensive characterization of SLNs. However, few studies have investigated the uptake of SLNs and these have had limited mechanistic focus. The aim of this work was to investigate the pathway of uptake of SLNs by human epithelial cells i.e., lung A549 and cervical HeLa cells. To the best of our knowledge, this is first study that investigates the cellular uptake of SLNs by human epithelial cells. The mechanism of cellular uptake was deciphered using pharmacologic inhibitors (sucrose, potassium-free buffer, filipin and cytochalasin B). Imaging techniques and flow assisted cell sorting (FACS) were used to assess the cellular uptake of SLNs loaded with rhodamine 123 as a fluorescent probe. This study provided evidence that the cellular uptake of SLNs was energy-dependent, and the endocytosis of SLNs was mainly dependent on clathrin-mediated mechanisms. The establishment of entry mechanism of SLNs is of fundamental importance for future facilitation of SLNs as biological or drug carriers.
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Affiliation(s)
- Rohan M Shah
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Melbourne, Australia
| | - Dhivya Rajasekaran
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Melbourne, Australia
| | - Mandy Ludford-Menting
- Immune Signalling Laboratory, Peter MacCallum Cancer Centre, East Melbourne, Australia; Cell Biology Laboratory, Center for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology Melbourne, Australia
| | - Daniel S Eldridge
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Melbourne, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Melbourne, Australia
| | - Ian H Harding
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Melbourne, Australia.
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Karpe AV, Beale DJ, Godhani NB, Morrison PD, Harding IH, Palombo EA. Untargeted Metabolic Profiling of Winery-Derived Biomass Waste Degradation by Penicillium chrysogenum. J Agric Food Chem 2015; 63:10696-704. [PMID: 26611372 DOI: 10.1021/acs.jafc.5b04834] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Winery-derived biomass waste was degraded by Penicillium chrysogenum under solid state fermentation over 8 days in a (2)H2O-supplemented medium. Multivariate statistical analysis of the gas chromatography-mass spectrometry (GC-MS) data resulted in the identification of 94 significant metabolites, within 28 different metabolic pathways. The majority of biomass sugars were utilized by day 4 to yield products such as sugars, fatty acids, isoprenoids, and amino acids. The fungus was observed to metabolize xylose to xylitol, an intermediate of ethanol production. However, enzyme inhibition and autolysis were observed from day 6, indicating 5 days as the optimal time for fermentation. P. chrysogenum displayed metabolism of pentoses (to alcohols) and degraded tannins and lignins, properties that are lacking in other biomass-degrading ascomycetes. Rapid fermentation (3-5 days) may not only increase the pentose metabolizing efficiency but also increase the yield of medicinally important metabolites, such as syringate.
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Affiliation(s)
- Avinash V Karpe
- Department of Chemistry and Biotechnology, Swinburne University of Technology , P.O. Box 218, Hawthorn, Victoria 3122, Australia
- Land and Water, Commonwealth Scientific and Industrial Research Organization (CSIRO), P.O. Box 2583, Dutton Park, Queensland 4001, Australia
| | - David J Beale
- Land and Water, Commonwealth Scientific and Industrial Research Organization (CSIRO), P.O. Box 2583, Dutton Park, Queensland 4001, Australia
| | - Nainesh B Godhani
- Department of Mechanical and Product Design Engineering, Swinburne University of Technology , P.O. Box 218, Hawthorn, Victoria 3122, Australia
| | - Paul D Morrison
- Australian Centre for Research on Separation Science, School of Applied Sciences, RMIT University , P.O. Box 2547, Melbourne, Victoria 3000, Australia
| | - Ian H Harding
- Department of Chemistry and Biotechnology, Swinburne University of Technology , P.O. Box 218, Hawthorn, Victoria 3122, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Swinburne University of Technology , P.O. Box 218, Hawthorn, Victoria 3122, Australia
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Rimoldi G, Uzal F, Chin RP, Palombo EA, Awad M, Lyras D, Shivaprasad HL. Necrotic Enteritis in Chickens Associated with Clostridium sordellii. Avian Dis 2015; 59:447-51. [PMID: 26478166 DOI: 10.1637/11077-033115-case.1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Three outbreaks of necrotic enteritis-like disease associated with Clostridium sordelii were diagnosed in commercial broiler chicken flocks with 18,000 to 31,000 birds between 18 and 26 days old. Clinical signs in the affected flocks included high mortality up to 2% a day, depression, and diarrhea. The main gross changes included segmental dilation of the small intestine with watery contents, gas, mucoid exudate, and roughened and uneven mucosa, occasionally covered with a pseudomembrane. Microscopic lesions in the small intestine were characterized by extensive areas of coagulative necrosis of the villi, fibrinous exudate in the lumen, and high numbers of large, Gram-positive rods, occasionally containing subterminal spores, seen in the necrotic tissue and lumen. These rods were identified as C. sordellii by immunohistochemistry. Clostridium sordellii was isolated in an almost pure culture from the intestine of affected birds. A retrospective study of commercial broiler chicken and turkey submissions to the California Animal Health and Food Safety Laboratory System revealed that C. sordellii had been isolated from intestinal lesions in outbreaks of necrotic enteritis-like disease in 8 of 39 cases, 5 times together with Clostridium perfringens and 3 times alone. The latter three cases are reported here.
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