1
|
Rachmadi AT, Gyawali P, Summers G, Jabed A, Fletcher GC, Hewitt J. PMAxx-RT-qPCR to Determine Human Norovirus Inactivation Following High-Pressure Processing of Oysters. Food Environ Virol 2024:10.1007/s12560-024-09585-4. [PMID: 38457095 DOI: 10.1007/s12560-024-09585-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 01/24/2024] [Indexed: 03/09/2024]
Abstract
Norovirus is the leading cause of viral gastroenteritis globally. While person-to-person transmission is most commonly reported route of infection, human norovirus is frequently associated with foodborne transmission, including through consumption of contaminated bivalve molluscan shellfish. Reverse transcription (RT)-qPCR is most commonly used method for detecting human norovirus detection in foods, but does not inform on its infectivity, posing challenges for assessing intervention strategies aimed at risk elimination. In this study, RT-qPCR was used in conjunction with a derivative of the photoreactive DNA binding dye propidium monoazide (PMAxx™) (PMAxx-RT-qPCR) to evaluate the viral capsid integrity of norovirus genogroup I and II (GI and GII) in shellfish following high pressure processing (HPP). Norovirus GI.3 and GII.4 bioaccumulated oysters were subjected to HPP at pressures of 300 and 450 MPa at 15 °C, and 300, 450 and 600 MPa at 20 °C. Samples were analysed using both RT-qPCR and PMAxx-RT-qPCR. For each sample, norovirus concentration (genome copies/g digestive tissue) determined by RT-qPCR was divided by the PMAxx-RT-qPCR concentration, giving the relative non-intact (RNI) ratio. The RNI ratio values relate to the amount of non-intact (non-infectious) viruses compared to fully intact (possible infectious) viruses. Our findings revealed an increasing RNI ratio value, indicating decreasing virus integrity, with increasing pressure and decreasing pressure. At 300 MPa, for norovirus GI, the median [95% confidence interval, CI] RNI ratio values were 2.6 [1.9, 3.0] at 15 °C compared to 1.1 [0.9, 1.8] at 20 °C. At 450 MPa, the RNI ratio values were 5.5 [2.9, 7.0] at 15 °C compared to 1.3 [1.0, 1.6] at 20 °C. At 600 MPa, the RNI ratio value was 5.1 [2.9, 13.4] at 20 °C. For norovirus GII, RT-qPCR and PMAxx-RT-qPCR detections were significantly reduced at 450 and 600 MPa at both 15 °C and 20 °C, with the median [95% CI] RNI ratio value at 300 MPa being 1.1 [0.8, 1.6]. Following HPP treatment, the use of PMAxx-RT-qPCR enables the selective detection of intact and potential infectious norovirus, enhancing our understanding of the inactivation profiles and supporting the development of more effective risk assessment strategies.
Collapse
Affiliation(s)
- Andri Taruna Rachmadi
- Institute of Environmental Science and Research Ltd (ESR), Kenepuru Science Centre, PO Box 50348, Porirua, 5240, New Zealand
| | - Pradip Gyawali
- Institute of Environmental Science and Research Ltd (ESR), Kenepuru Science Centre, PO Box 50348, Porirua, 5240, New Zealand
| | - Graeme Summers
- The New Zealand Institute for Plant and Food Research Ltd (PFR), Private Bag 92169, Auckland, 1142, New Zealand
| | - Anower Jabed
- Institute of Environmental Science and Research Ltd (ESR), Kenepuru Science Centre, PO Box 50348, Porirua, 5240, New Zealand
| | - Graham C Fletcher
- The New Zealand Institute for Plant and Food Research Ltd (PFR), Private Bag 92169, Auckland, 1142, New Zealand
| | - Joanne Hewitt
- Institute of Environmental Science and Research Ltd (ESR), Kenepuru Science Centre, PO Box 50348, Porirua, 5240, New Zealand.
| |
Collapse
|
2
|
Vidovic S, Taylor R, Hedderley D, Fletcher GC, Wei N. Detection of non-pathogenic and pathogenic populations of Vibrio parahaemolyticus in various samples by the conventional, quantitative and droplet digital PCRs. Sci Rep 2024; 14:4137. [PMID: 38374337 PMCID: PMC10876695 DOI: 10.1038/s41598-024-54753-y] [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: 01/08/2024] [Accepted: 02/15/2024] [Indexed: 02/21/2024] Open
Abstract
In this study, three generations of polymerase chain reaction (PCR) assays: (i) conventional PCR, (ii) qPCR and (iii) droplet digital PCR (ddPCR), were systematically tested for their abilities to detect non-pathogenic and pathogenic populations of Vibrio parahaemolyticus. The limit of detection (LOD) for the ddPCR was 1.1 pg/µL of purified DNA, followed by the qPCR (5.6 pg/µL) and the conventional PCR (8.8 pg/µL). Regarding the LOD for V. parahaemolyticus cells, the ddPCR assay was able to detect 29 cells, followed by the conventional PCR assay (58 cells) and the qPCR assay (115 cells). Regarding the sensitivities to detect this pathogen from PCR inhibition prone samples (naturally contaminated mussels), the ddPCR assay significantly outperformed the conventional PCR and qPCR. The ddPCR assay was able to consistently detect non-pathogenic and pathogenic populations of V. parahaemolyticus from naturally contaminated mussels, indicating its tolerance to various PCR inhibitors. This study also revealed the significant difference between conventional PCR and qPCR. The conventional PCR assay showed significantly greater sensitivity than that of the qPCR assay in detecting V. parahaemolyticus in crude samples, whereas the qPCR assay showed better sensitivity in detecting the presence of V. parahaemolyticus in purified DNA samples.
Collapse
Affiliation(s)
- Sinisa Vidovic
- The New Zealand Institute for Plant and Food Research Limited, 120 Mount Albert Road, Sandringham, 1025, Auckland, New Zealand.
| | - Roland Taylor
- The New Zealand Institute for Plant and Food Research Limited, 120 Mount Albert Road, Sandringham, 1025, Auckland, New Zealand
| | - Duncan Hedderley
- The New Zealand Institute for Plant and Food Research Limited, Palmerston North, New Zealand
| | - Graham C Fletcher
- The New Zealand Institute for Plant and Food Research Limited, 120 Mount Albert Road, Sandringham, 1025, Auckland, New Zealand
| | | |
Collapse
|
3
|
Wang D, Palmer JS, Fletcher GC, On SLW, Gagic D, Flint SH. Efficacy of commercial peroxyacetic acid on Vibrio parahaemolyticus planktonic cells and biofilms on stainless steel and Greenshell™ mussel (Perna canaliculus) surfaces. Int J Food Microbiol 2023; 405:110372. [PMID: 37672942 DOI: 10.1016/j.ijfoodmicro.2023.110372] [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: 03/28/2023] [Revised: 08/07/2023] [Accepted: 08/26/2023] [Indexed: 09/08/2023]
Abstract
The potential of using commercial peroxyacetic acid (PAA) for Vibrio parahaemolyticus sanitization was evaluated. Commercial PAA of 0.005 % (v/v, PAA: 2.24 mg/L, hydrogen peroxide: 11.79 mg/L) resulted in a planktonic cell reduction of >7.00 log10 CFU/mL when initial V. parahaemolyticus cells averaged 7.64 log10 CFU/mL. For cells on stainless steel coupons, treatment of 0.02 % PAA (v/v, PAA: 8.96 mg/L, hydrogen peroxide: 47.16 mg/L) achieved >5.00 log10 CFU/cm2 reductions in biofilm cells for eight strains but not for the two strongest biofilm formers. PAA of 0.05 % (v/v, PAA: 22.39 mg/L, hydrogen peroxide: 117.91 mg/L) was required to inactivate >5.00 log10 CFU/cm2 biofilm cells from mussel shell surfaces. The detection of PAA residues after biofilm treatment demonstrated that higher biofilm production resulted in higher PAA residues (p < 0.05), suggesting biofilm is acting as a barrier interfering with PAA diffusing into the matrices. Based on the comparative analysis of genomes, robust biofilm formation and metabolic heterogeneity within niches might have contributed to the variations in PAA resistance of V. parahaemolyticus biofilms.
Collapse
Affiliation(s)
- Dan Wang
- School of Food and Advanced Technology, Massey University, Private Bag 11222, Palmerston North, New Zealand.
| | - Jon S Palmer
- School of Food and Advanced Technology, Massey University, Private Bag 11222, Palmerston North, New Zealand
| | - Graham C Fletcher
- The New Zealand Institute for Plant & Food Research Limited, Private Bag 92169, Auckland 1142, New Zealand
| | - Stephen L W On
- Faculty of Agriculture and Life Sciences, Lincoln University, Private Bag 85084, Canterbury, New Zealand
| | - Dragana Gagic
- School of Fundamental Sciences, Massey University, Private Bag 11222, Palmerston North, New Zealand
| | - Steve H Flint
- School of Food and Advanced Technology, Massey University, Private Bag 11222, Palmerston North, New Zealand
| |
Collapse
|
4
|
Vasey J, Jones D, Deng CH, Hedderley D, Martinez-Urtaza J, Powell A, Wang J, Wright J, Merien AMP, Fletcher GC, Vidovic S. Comparative genomics uncovered differences between clinical and environmental populations of Vibrio parahaemolyticus in New Zealand. Microb Genom 2023; 9. [PMID: 37266976 DOI: 10.1099/mgen.0.001037] [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] [Indexed: 06/03/2023] Open
Abstract
Vibrio parahaemolyticus has been identified as an emerging human pathogen worldwide with cases undergoing a global expansion over recent decades in phase with climate change. New Zealand had remained free of outbreaks until 2019, but different outbreaks have been reported consecutively since then. To provide new insights into the recent emergence of cases associated with outbreak clones over recent years, a comparative genomic study was carried out using a selection of clinical (mostly outbreak) and environmental isolates of V. parahaemolyticus obtained in New Zealand between 1973 and 2021. Among 151 isolates of clinical (n=60) and environmental (n=91) origin, 47 sequence types (STs) were identified, including 31 novel STs. The population of environmental isolates generated 30 novel STs, whereas only 1 novel ST (ST2658) was identified among the population of clinical isolates. The novel clinical ST was a single-locus variant of the pandemic ST36 strain, indicating further evolution of this pandemic strain. The environmental isolates exhibited a significant genetic heterogeneity compared to the clinical isolates. The whole-genome phylogeny separated the population of clinical isolates from their environmental counterparts, clearly indicating their distant genetic relatedness. In addition to differences in ancestral profiles and genetic relatedness, these two groups of isolates exhibited a profound difference in their virulence profiles. While the entire population of clinical isolates harboured the thermostable direct haemolysin (tdh) and/or the thermostable-related haemolysin (trh), only a few isolates of environmental origin possessed the same virulence genes. In contrast to tdh and trh, adhesin-encoding genes, vpadF and MSHA, showed a significantly (P<0.001) greater association with the environmental isolates compared to the clinical isolates. The effectors, VopQ, VPA0450 and VopS, which belong to T3SS1, were ubiquitous, being present in each isolate regardless of its origin. The effectors VopC and VopA, which belong to T3SS2, were rarely detected in any of the examined isolates. Our data indicate that the clinical and environmental isolates of V. parahaemolyticus from New Zealand differ in their population structures, ancestral profiles, genetic relatedness and virulence profiles. In addition, we identified numerous unique non-synonymous single-nucleotide polymorphisms (nsSNPs) in adhesins and effectors, exclusively associated with the clinical isolates tested, which may suggest a possible role of these mutations in the overall virulence of the clinical isolates.
Collapse
Affiliation(s)
- Jack Vasey
- The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| | - Dan Jones
- The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| | - Cecilia H Deng
- The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| | - Duncan Hedderley
- The New Zealand Institute for Plant and Food Research Limited, Palmerston North, New Zealand
| | | | - Andy Powell
- National Centre for Biosecurity and Infectious Disease, Centre for Environmental Fisheries and Agriculture Science, Weymouth, Dorset, UK
| | - Jing Wang
- Institute of Environmental Science and Research Limited, Wellington, New Zealand
| | - Jackie Wright
- Institute of Environmental Science and Research Limited, Wellington, New Zealand
| | | | - Graham C Fletcher
- The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| | - Sinisa Vidovic
- The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| |
Collapse
|
5
|
Wang D, Fletcher GC, Gagic D, On SLW, Palmer JS, Flint SH. Comparative genome identification of accessory genes associated with strong biofilm formation in Vibrio parahaemolyticus. Food Res Int 2023; 166:112605. [PMID: 36914349 DOI: 10.1016/j.foodres.2023.112605] [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: 10/30/2022] [Revised: 02/04/2023] [Accepted: 02/14/2023] [Indexed: 02/18/2023]
Abstract
Vibrio parahaemolyticus biofilms on the seafood processing plant surfaces are a potential source of seafood contamination and subsequent food poisoning. Strains differ in their ability to form biofilm, but little is known about the genetic characteristics responsible for biofilm development. In this study, pangenome and comparative genome analysis of V. parahaemolyticus strains reveals genetic attributes and gene repertoire that contribute to robust biofilm formation. The study identified 136 accessory genes that were exclusively present in strong biofilm forming strains and these were functionally assigned to the Gene Ontology (GO) pathways of cellulose biosynthesis, rhamnose metabolic and catabolic processes, UDP-glucose processes and O antigen biosynthesis (p < 0.05). Strategies of CRISPR-Cas defence and MSHA pilus-led attachment were implicated via Kyoto Encyclopedia of Genes and Genomes (KEGG) annotation. Higher levels of horizontal gene transfer (HGT) were inferred to confer more putatively novel properties on biofilm-forming V. parahaemolyticus. Furthermore, cellulose biosynthesis, a neglected potential virulence factor, was identified as being acquired from within the order Vibrionales. The cellulose synthase operons in V. parahaemolyticus were examined for their prevalence (22/138, 15.94 %) and were found to consist of the genes bcsG, bcsE, bcsQ, bcsA, bcsB, bcsZ, bcsC. This study provides insights into robust biofilm formation of V. parahaemolyticus at the genomic level and facilitates: identification of key attributes for robust biofilm formation, elucidation of biofilm formation mechanisms and development of potential targets for novel control strategies of persistent V. parahaemolyticus.
Collapse
Affiliation(s)
- Dan Wang
- School of Food and Advanced Technology, Massey University, Private Bag 11222, Palmerston North, New Zealand
| | - Graham C Fletcher
- The New Zealand Institute for Plant & Food Research Limited, Private Bag 92169, Auckland 1142, New Zealand
| | - Dragana Gagic
- School of Fundamental Sciences, Massey University, Private Bag 11222, Palmerston North, New Zealand
| | - Stephen L W On
- Faculty of Agriculture and Life Sciences, Lincoln University, Private Bag 85084, Canterbury, New Zealand
| | - Jon S Palmer
- School of Food and Advanced Technology, Massey University, Private Bag 11222, Palmerston North, New Zealand
| | - Steve H Flint
- School of Food and Advanced Technology, Massey University, Private Bag 11222, Palmerston North, New Zealand.
| |
Collapse
|
6
|
Soria-Bretones I, Thu KL, Silvester J, Cruickshank J, El Ghamrasni S, Ba-alawi W, Fletcher GC, Kiarash R, Elliott MJ, Chalmers JJ, Elia AC, Cheng A, Rose AAN, Bray MR, Haibe-Kains B, Mak TW, Cescon DW. The spindle assembly checkpoint is a therapeutic vulnerability of CDK4/6 inhibitor-resistant ER + breast cancer with mitotic aberrations. Sci Adv 2022; 8:eabq4293. [PMID: 36070391 PMCID: PMC9451148 DOI: 10.1126/sciadv.abq4293] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 07/21/2022] [Indexed: 06/15/2023]
Abstract
Inhibitors of cyclin-dependent kinases 4 and 6 (CDK4/6i) are standard first-line treatments for metastatic ER+ breast cancer. However, acquired resistance to CDK4/6i invariably develops, and the molecular phenotypes and exploitable vulnerabilities associated with resistance are not yet fully characterized. We developed a panel of CDK4/6i-resistant breast cancer cell lines and patient-derived organoids and demonstrate that a subset of resistant models accumulates mitotic segregation errors and micronuclei, displaying increased sensitivity to inhibitors of mitotic checkpoint regulators TTK and Aurora kinase A/B. RB1 loss, a well-recognized mechanism of CDK4/6i resistance, causes such mitotic defects and confers enhanced sensitivity to TTK inhibition. In these models, inhibition of TTK with CFI-402257 induces premature chromosome segregation, leading to excessive mitotic segregation errors, DNA damage, and cell death. These findings nominate the TTK inhibitor CFI-402257 as a therapeutic strategy for a defined subset of ER+ breast cancer patients who develop resistance to CDK4/6i.
Collapse
Affiliation(s)
- Isabel Soria-Bretones
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
- Segal Cancer Centre and Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, QC, Canada
- Gerald Bronfman Department of Oncology, McGill University, Montreal, QC, Canada
| | - Kelsie L. Thu
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
- Keenan Research Centre for Biomedical Sciences, St. Michael’s Hospital , Toronto,, ON, Canada
- Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Jennifer Silvester
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | | | - Samah El Ghamrasni
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Wail Ba-alawi
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Graham C. Fletcher
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Reza Kiarash
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Mitchell J. Elliott
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
- Department of Medicine, University of Toronto, Toronto , ON, Canada
| | - Jordan J. Chalmers
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Andrea C. Elia
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Albert Cheng
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - April A. N. Rose
- Segal Cancer Centre and Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, QC, Canada
- Gerald Bronfman Department of Oncology, McGill University, Montreal, QC, Canada
| | - Mark R. Bray
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | | | - Tak W. Mak
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - David W. Cescon
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
- Department of Medicine, University of Toronto, Toronto , ON, Canada
| |
Collapse
|
7
|
Vidovic S, Paturi G, Gupta S, Fletcher GC. Lifestyle of Listeria monocytogenes and food safety: Emerging listericidal technologies in the food industry. Crit Rev Food Sci Nutr 2022; 64:1817-1835. [PMID: 36062812 DOI: 10.1080/10408398.2022.2119205] [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] [Indexed: 11/03/2022]
Abstract
Listeria monocytogenes, a causative agent of listeriosis, is a major foodborne pathogen. Among pathogens, L. monocytogenes stands out for its unique ecological and physiological characteristics. This distinct lifestyle of L. monocytogenes has a significant impact on food safety and public health, mainly through the ability of this pathogen to multiply at refrigeration temperature and to persist in the food processing environment. Due to a combination of these characteristics and emerging trends in consumer preference for ready-to-eat and minimally processed food, there is a need to develop effective and sustainable approaches to control contamination of food products with L. monocytogenes. Implementation of an efficient and reliable control strategy for L. monocytogenes must first address the problem of cross-contamination. Besides the preventive control strategies, cross-contamination may be addressed with the introduction of emerging post packaging non-thermal or thermal hurdles that can ensure delivery of a listericidal step in a packed product without interfering with the organoleptic characteristics of a food product. This review aims to present the most relevant findings underlying the distinct lifestyle of L. monocytogenes and its impact on food safety. We also discuss emerging food decontamination technologies that can be used to better control L. monocytogenes.
Collapse
Affiliation(s)
- Sinisa Vidovic
- Food Safety Preservation Team, The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| | - Gunaranjan Paturi
- Food Safety Preservation Team, The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| | - Sravani Gupta
- Food Safety Preservation Team, The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| | - Graham C Fletcher
- Food Safety Preservation Team, The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| |
Collapse
|
8
|
Chalke S, Vidovic S, Fletcher GC, Palmer J, Flint S. Differential effects of magnesium, calcium, and sodium on Listeria monocytogenes biofilm formation. Biofouling 2022; 38:786-795. [PMID: 36210503 DOI: 10.1080/08927014.2022.2131398] [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: 03/22/2022] [Revised: 08/16/2022] [Accepted: 09/26/2022] [Indexed: 06/16/2023]
Abstract
Listeria monocytogenes is a gram-positive foodborne pathogen that causes outbreaks of listeriosis associated with a diverse range of foods. L. monocytogenes forms biofilms as a strategy to enhance its survival in the environment. These biofilms then provide a source of contamination in processing plant environments. Cations like magnesium, calcium, and sodium are commonly found in the environment and are important to bacteria to maintain their homeostasis. It is, therefore, valuable to understand the relationship between these cations and biofilm formation. In this study, four isolates of L. monocytogenes from seafood processing environments were used to investigate the influence of magnesium, calcium, and sodium (1, 10, and 50 mM) on biofilms. The isolates selected were defined as being either a low biofilm former, a high biofilm former, an outbreak isolate, and a persistent isolate from the seafood industry. The study showed that the divalent cations magnesium and calcium increased biofilm formation compared with the monovalent cation, sodium. Fifty mM concentrations of the divalent cations significantly enhanced biofilm formation. The cations did not have a significant effect on the initial stages of biofilm formation but appeared to influence the later stages of biofilm development.
Collapse
Affiliation(s)
- Saili Chalke
- Food Safety and Preservation Team, The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
- Institute of Food Science and Technology, School of Food and Advanced Technology, Massey University, Palmerston North, New Zealand
| | - Sinisa Vidovic
- Food Safety and Preservation Team, The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| | - Graham C Fletcher
- Food Safety and Preservation Team, The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| | - Jon Palmer
- Institute of Food Science and Technology, School of Food and Advanced Technology, Massey University, Palmerston North, New Zealand
| | - Steve Flint
- Institute of Food Science and Technology, School of Food and Advanced Technology, Massey University, Palmerston North, New Zealand
| |
Collapse
|
9
|
Wang D, Flint SH, Palmer JS, Gagic D, Fletcher GC, On SL. Global expansion of Vibrio parahaemolyticus threatens the seafood industry: Perspective on controlling its biofilm formation. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113182] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
10
|
Wang D, Flint SH, Gagic D, Palmer JS, Fletcher GC, On SLW. In silico analysis revealing CsrA roles in motility-sessility switching and tuning VBNC cells in Vibrio parahaemolyticus. Biofouling 2021; 37:680-688. [PMID: 34369215 DOI: 10.1080/08927014.2021.1955357] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 07/05/2021] [Accepted: 07/10/2021] [Indexed: 06/13/2023]
Abstract
The formation of biofilms is a survival strategy employed by bacteria to help protect them from changing or unfavourable environments. In this research, 319 genes which govern biofilm formation in V. parahaemolyticus, as reported in 1,625 publications, were analysed using protein-protein-interaction (PPI) network analysis. CsrA was identified as a motility-sessility switch and biofilm formation regulator. Through robust rank aggregation (RRA) analysis of GSE65340, the generation of viable but non-culturable (VBNC) cells that may enhance cell tolerance to stress, was found to be associated with the TCA cycle and carbon metabolism biological pathways. The finding that CsrA is likely to play a role in the development of VBNC cells improves understanding of the molecular mechanisms of VBNC formation in V. parahaemolyticus and contributes to on-going efforts to reduce the hazard posed by this foodborne pathogen.
Collapse
Affiliation(s)
- Dan Wang
- School of Food and Advanced Technology, Massey University, Palmerston North, New Zealand
| | - Steve H Flint
- School of Food and Advanced Technology, Massey University, Palmerston North, New Zealand
| | - Dragana Gagic
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Jon S Palmer
- School of Food and Advanced Technology, Massey University, Palmerston North, New Zealand
| | - Graham C Fletcher
- The New Zealand Institute for Plant & Food Research Limited, Auckland, New Zealand
| | - Stephen L W On
- Faculty of Agriculture and Life Sciences, Lincoln University, Canterbury, New Zealand
| |
Collapse
|
11
|
Nowak J, Visnovsky SB, Pitman AR, Cruz CD, Palmer J, Fletcher GC, Flint S. Biofilm Formation by Listeria monocytogenes 15G01, a Persistent Isolate from a Seafood-Processing Plant, Is Influenced by Inactivation of Multiple Genes Belonging to Different Functional Groups. Appl Environ Microbiol 2021; 87:e02349-20. [PMID: 33741610 PMCID: PMC8117777 DOI: 10.1128/aem.02349-20] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 02/25/2021] [Indexed: 01/13/2023] Open
Abstract
Listeria monocytogenes is a ubiquitous foodborne pathogen that results in a high rate of mortality in sensitive and immunocompromised people. Contamination of food with L. monocytogenes is thought to occur during food processing, most often as a result of the pathogen producing a biofilm that persists in the environment and acting as the source for subsequent dispersal of cells onto food. A survey of seafood-processing plants in New Zealand identified the persistent strain 15G01, which has a high capacity to form biofilms. In this study, a transposon library of L. monocytogenes 15G01 was screened for mutants with altered biofilm formation, assessed by a crystal violet assay, to identify genes involved in biofilm formation. This screen identified 36 transposants that showed a significant change in biofilm formation compared to the wild type. The insertion sites were in 27 genes, 20 of which led to decreased biofilm formation and seven to an increase. Two insertions were in intergenic regions. Annotation of the genes suggested that they are involved in diverse cellular processes, including stress response, autolysis, transporter systems, and cell wall/membrane synthesis. Analysis of the biofilms produced by the transposants using scanning electron microscopy and fluorescence microscopy showed notable differences in the structure of the biofilms compared to the wild type. In particular, inactivation of uvrB and mltD produced coccoid-shaped cells and elongated cells in long chains, respectively, and the mgtB mutant produced a unique biofilm with a sandwich structure which was reversed to the wild-type level upon magnesium addition. The mltD transposant was successfully complemented with the wild-type gene, whereas the phenotypes were not or only partially restored for the remaining mutants.IMPORTANCE The major source of contamination of food with Listeria monocytogenes is thought to be due to biofilm formation and/or persistence in food-processing plants. By establishing as a biofilm, L. monocytogenes cells become harder to eradicate due to their increased resistance to environmental threats. Understanding the genes involved in biofilm formation and their influence on biofilm structure will help identify new ways to eliminate harmful biofilms in food processing environments. To date, multiple genes have been identified as being involved in biofilm formation by L. monocytogenes; however, the exact mechanism remains unclear. This study identified four genes associated with biofilm formation by a persistent strain. Extensive microscopic analysis illustrated the effect of the disruption of mgtB, clsA, uvrB, and mltD and the influence of magnesium on the biofilm structure. The results strongly suggest an involvement in biofilm formation for the four genes and provide a basis for further studies to analyze gene regulation to assess the specific role of these biofilm-associated genes.
Collapse
Affiliation(s)
- Jessika Nowak
- The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
- Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| | - Sandra B Visnovsky
- The New Zealand Institute for Plant and Food Research Limited, Lincoln, New Zealand
| | - Andrew R Pitman
- The Foundation for Arable Research, Christchurch, New Zealand
| | - Cristina D Cruz
- The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
- Drug Research Program, Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Jon Palmer
- Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| | - Graham C Fletcher
- The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| | - Steve Flint
- Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| |
Collapse
|
12
|
Mohan V, Cruz CD, van Vliet AHM, Pitman AR, Visnovsky SB, Rivas L, Gilpin B, Fletcher GC. Genomic diversity of Listeria monocytogenes isolates from seafood, horticulture and factory environments in New Zealand. Int J Food Microbiol 2021; 347:109166. [PMID: 33838478 DOI: 10.1016/j.ijfoodmicro.2021.109166] [Citation(s) in RCA: 10] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 02/28/2021] [Accepted: 03/06/2021] [Indexed: 11/28/2022]
Abstract
Listeria monocytogenes is a foodborne human pathogen that causes systemic infection, fetal-placental infection in pregnant women causing abortion and stillbirth and meningoencephalitis in elderly and immunocompromised individuals. This study aimed to analyse L. monocytogenes from different sources from New Zealand (NZ) and to compare them with international strains. We used pulsed-field gel electrophoresis (PFGE), multilocus sequence typing (MLST) and whole-genome single nucleotide polymorphisms (SNP) to study the population structure of the NZ L. monocytogenes isolates and their relationship with the international strains. The NZ isolates formed unique clusters in PFGE, MLST and whole-genome SNP comparisons compared to the international isolates for which data were available. PFGE identified 31 AscI and 29 ApaI PFGE patterns with indistinguishable pulsotypes being present in seafood, horticultural products and environmental samples. Apart from the Asc0002:Apa0002 pulsotype which was distributed across different sources, other pulsotypes were site or factory associated. Whole-genome analysis of 200 randomly selected L. monocytogenes isolates revealed that lineage II dominated the NZ L. monocytogenes populations. MLST comparison of international and NZ isolates with lineage II accounted for 89% (177 of 200) of the total L. monocytogenes population, while the international representation was 45.3% (1674 of 3473). Rarefaction analysis showed that sequence type richness was greater in NZ isolates compared to international trend, however, it should be noted that NZ isolates predominantly came from seafood, horticulture and their respective processing environments or factories, unlike international isolates where there was a good mixture of clinical, food and environmental isolates.
Collapse
Affiliation(s)
- Vathsala Mohan
- The New Zealand Institute for Plant & Food Research Limited, Auckland, New Zealand.
| | - Cristina D Cruz
- The New Zealand Institute for Plant & Food Research Limited, Auckland, New Zealand
| | - Arnoud H M van Vliet
- Department of Pathology and Infectious Diseases, School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Daphne Jackson Road, Guildford GU2 7AL, Surrey, United Kingdom
| | - Andrew R Pitman
- The New Zealand Institute for Plant & Food Research Limited, Lincoln, New Zealand.
| | - Sandra B Visnovsky
- The New Zealand Institute for Plant & Food Research Limited, Lincoln, New Zealand
| | - Lucia Rivas
- Institute of Environmental Science and Research Limited, Christchurch, New Zealand
| | - Brent Gilpin
- Institute of Environmental Science and Research Limited, Christchurch, New Zealand
| | - Graham C Fletcher
- The New Zealand Institute for Plant & Food Research Limited, Auckland, New Zealand
| |
Collapse
|
13
|
On SLW, Zhang Y, Gehring A, Patsekin V, Chelikani V, Flint S, Wang H, Billington C, Fletcher GC, Lindsay J, Robinson JP. Elastic Light Scatter Pattern Analysis for the Expedited Detection of Yersinia Species in Pork Mince: Proof of Concept. Front Microbiol 2021; 12:641801. [PMID: 33679677 PMCID: PMC7928378 DOI: 10.3389/fmicb.2021.641801] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 01/29/2021] [Indexed: 11/23/2022] Open
Abstract
Isolation of the pathogens Yersinia enterocolitica and Yersinia pseudotuberculosis from foods typically rely on slow (10–21 day) “cold enrichment” protocols before confirmed results are obtained. We describe an approach that yields results in 39 h that combines an alternative enrichment method with culture on a non-selective medium, and subsequent identification of suspect colonies using elastic light scatter (ELS) analysis. A prototype database of ELS profiles from five Yersinia species and six other bacterial genera found in pork mince was established, and used to compare similar profiles of colonies obtained from enrichment cultures from pork mince samples seeded with representative strains of Y. enterocolitica and Y. pseudotuberculosis. The presumptive identification by ELS using computerised or visual analyses of 83/90 colonies in these experiments as the target species was confirmed by partial 16S rDNA sequencing. In addition to seeded cultures, our method recovered two naturally occurring Yersinia strains. Our results indicate that modified enrichment combined with ELS is a promising new approach for expedited detection of foodborne pathogenic yersiniae.
Collapse
Affiliation(s)
- Stephen L W On
- Department of Wine, Food and Molecular Biosciences, Lincoln University, Lincoln, New Zealand
| | - Yuwei Zhang
- Department of Wine, Food and Molecular Biosciences, Lincoln University, Lincoln, New Zealand
| | - Andrew Gehring
- Eastern Regional Research Center, Agricultural Research Service, USDA, Wyndmoor, PA, United States
| | - Valery Patsekin
- Department of Basic Medical Sciences, Purdue University, West Lafayette, IN, United States
| | - Venkata Chelikani
- Department of Wine, Food and Molecular Biosciences, Lincoln University, Lincoln, New Zealand
| | - Steve Flint
- School of Food and Advanced Technology, Massey University, Palmerston North, New Zealand
| | - Haoran Wang
- School of Food and Advanced Technology, Massey University, Palmerston North, New Zealand
| | - Craig Billington
- Institute of Environmental Science and Research, Christchurch, New Zealand
| | - Graham C Fletcher
- New Zealand Institute for Plant & Food Research Limited, Auckland, New Zealand
| | - James Lindsay
- Agricultural Research Service, Office of National Programs, USDA, Washington, DC, United States
| | - J Paul Robinson
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, United States
| |
Collapse
|
14
|
Cruz CD, Fletcher GC, Paturi G, Hedderley DI. Corrigendum to "Influence of farming methods and seawater depth on Vibrio species in New Zealand Pacific oysters" [Int. J. Food Microbiol. 325 (2020) 1-7/108633]. Int J Food Microbiol 2021; 345:109087. [PMID: 33602524 DOI: 10.1016/j.ijfoodmicro.2021.109087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Cristina D Cruz
- The New Zealand Institute for Plant and Food Research Limited, Private Bag 92169, Auckland 1142, New Zealand
| | - Graham C Fletcher
- The New Zealand Institute for Plant and Food Research Limited, Private Bag 92169, Auckland 1142, New Zealand.
| | - Gunaranjan Paturi
- The New Zealand Institute for Plant and Food Research Limited, Private Bag 92169, Auckland 1142, New Zealand
| | - Duncan I Hedderley
- The New Zealand Institute for Plant and Food Research Limited, Private Bag 11600, Palmerston North 4442, New Zealand
| |
Collapse
|
15
|
Nangul A, Bozkurt H, Gupta S, Woolf A, Phan-Thien KY, McConchie R, Fletcher GC. Decline of Listeria monocytogenes on fresh apples during long-term, low-temperature simulated international sea-freight transport. Int J Food Microbiol 2021; 341:109069. [PMID: 33508582 DOI: 10.1016/j.ijfoodmicro.2021.109069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 01/01/2021] [Accepted: 01/09/2021] [Indexed: 11/30/2022]
Abstract
Listeria monocytogenes has caused outbreaks of foodborne illness from apples in the USA, and is also a major issue for regulatory compliance worldwide. Due to apple's significance as an important export product from New Zealand, we aimed to determine the effect of long-term, low-temperature sea-freight from New Zealand to the USA (July) and Europe (March-April), two key New Zealand markets, on the survival and/or growth of L. monocytogenes on fresh apples. Temperature and humidity values were recorded during a shipment to each market (USA and Europe), then the observed variations around the 0.5 °C target temperature were simulated in laboratory trials using open ('Scired') and closed ('Royal Gala' for the USA and 'Cripps Pink' for Europe) calyx cultivars of apples inoculated with a cocktail of 107-108 cells of seven strains of L. monocytogenes. Samples were analysed for L. monocytogenes quantification at various intervals during the simulation and on each occasion, an extra set was analysed after a subsequent 8 days at 20 °C. When both the sea-freight simulations concluded, L. monocytogenes showed 5 log reductions on the equatorial surface of skin of apples, but only about 2.5 log reduction for USA and about 3.3 log reduction for Europe in the calyx. Cultivar type had no significant effect on the survival of L. monocytogenes for both sea-freight simulations, either in the calyx or on the skin (P > 0.05). Most of the reduction in the culturable cells on the skin occurred during the initial 2 weeks of the long-term storage simulations. There was also no significant difference in the reduction of L. monocytogenes at 0.5 or 20 °C. No correlation was observed between firmness or total soluble solids and survival of L. monocytogenes. Because the inoculated bacterial log reduction was lower in the calyx than on the skin, it is speculated that the risk of causing illness is higher if contaminated apple cores are eaten. The result suggested that the international sea-freight transportation does not result in the growth of L. monocytogenes irrespective of time and temperature. The results of this study provide useful insights into the survival of L. monocytogenes on different apple cultivars that can be used to develop effective risk mitigation strategies for fresh apples during long-term, low-temperature international sea-freight transportation.
Collapse
Affiliation(s)
- Agam Nangul
- ARC Industrial Transformation Training Centre for Food Safety in the Fresh Produce Industry, Sydney Institute of Agriculture, Faculty of Science, The University of Sydney, NSW 2006, Australia; The New Zealand Institute for Plant and Food Research Limited, Private Bag 92169, Auckland Mail Centre, Auckland 1142, New Zealand
| | - Hayriye Bozkurt
- ARC Industrial Transformation Training Centre for Food Safety in the Fresh Produce Industry, Sydney Institute of Agriculture, Faculty of Science, The University of Sydney, NSW 2006, Australia.
| | - Sravani Gupta
- The New Zealand Institute for Plant and Food Research Limited, Private Bag 92169, Auckland Mail Centre, Auckland 1142, New Zealand
| | - Allan Woolf
- The New Zealand Institute for Plant and Food Research Limited, Private Bag 92169, Auckland Mail Centre, Auckland 1142, New Zealand
| | - Kim-Yen Phan-Thien
- ARC Industrial Transformation Training Centre for Food Safety in the Fresh Produce Industry, Sydney Institute of Agriculture, Faculty of Science, The University of Sydney, NSW 2006, Australia
| | - Robyn McConchie
- ARC Industrial Transformation Training Centre for Food Safety in the Fresh Produce Industry, Sydney Institute of Agriculture, Faculty of Science, The University of Sydney, NSW 2006, Australia
| | - Graham C Fletcher
- The New Zealand Institute for Plant and Food Research Limited, Private Bag 92169, Auckland Mail Centre, Auckland 1142, New Zealand.
| |
Collapse
|
16
|
Kyere EO, Qiu GW, Md Zain SN, Palmer J, Wargent JJ, Fletcher GC, Flint S. A comparison of Listeria monocytogenes contamination in bagged and un-bagged lettuce in supermarkets. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.110022] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
17
|
Angane M, Gupta S, Fletcher GC, Summers G, Hedderley DI, Quek SY. Effect of air blast freezing and frozen storage on Escherichia coli survival, n-3 polyunsaturated fatty acid concentration and microstructure of Greenshell™ mussels. Food Control 2020. [DOI: 10.1016/j.foodcont.2020.107284] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
18
|
Nowak J, Visnovsky SB, Cruz CD, Fletcher GC, van Vliet AHM, Hedderley D, Butler R, Flint S, Palmer J, Pitman AR. Inactivation of the gene encoding the cationic antimicrobial peptide resistance factor MprF increases biofilm formation but reduces invasiveness of Listeria monocytogenes. J Appl Microbiol 2020; 130:464-477. [PMID: 32687650 DOI: 10.1111/jam.14790] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 12/16/2019] [Revised: 06/18/2020] [Accepted: 07/14/2020] [Indexed: 11/27/2022]
Abstract
AIMS To understand the genetics involved in surface attachment and biofilm formation of Listeria monocytogenes. METHODS AND RESULTS An in vitro screen of a Himar1 transposon library of L. monocytogenes strain 15G01 identified three transposants that produced significantly different biofilm levels when compared to the wild-type strain; two mutants exhibited enhanced biofilm formation and one produced less biofilm biomass than the wild-type. The mutant 15G01 mprF::Himar1, which had a transposon insertion in the mprF gene, was selected for further analysis. The mutant produced a more densely populated biofilm on solid surfaces such as stainless steel and polystyrene, as determined using scanning electron and light microscopy. The 15G01 mprF::Himar1 mutant remained viable in biofilms, but showed an increase in sensitivity to the cationic antimicrobial gallidermin. The mutant also displayed reduced invasiveness in CaCo-2 intestinal cells, suggesting virulence properties are compromised by the inactivation of mprF. CONCLUSIONS Biofilm formation and gallidermin resistance of L. monocytogenes is influenced by mprF, but this trait is associated with a compromise in invasiveness. SIGNIFICANCE AND IMPACT OF THE STUDY The presence of pathogenic microorganisms in the food processing environment can cause a significant problem, especially when these microorganisms are established as biofilms. This study shows that the inactivation of the mprF gene results in enhanced biofilm formation and abiotic surface attachment of L. monocytogenes.
Collapse
Affiliation(s)
- J Nowak
- The New Zealand Institute for Plant & Food Research Limited, Auckland, New Zealand.,Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| | - S B Visnovsky
- The New Zealand Institute for Plant & Food Research Limited, Lincoln, New Zealand
| | - C D Cruz
- Drug Research Program, Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - G C Fletcher
- The New Zealand Institute for Plant & Food Research Limited, Auckland, New Zealand
| | - A H M van Vliet
- School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK
| | - D Hedderley
- The New Zealand Institute for Plant & Food Research Limited, Palmerston North, New Zealand
| | - R Butler
- The New Zealand Institute for Plant & Food Research Limited, Lincoln, New Zealand
| | - S Flint
- Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| | - J Palmer
- Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| | - A R Pitman
- The Foundation for Arable Research, Christchurch, New Zealand
| |
Collapse
|
19
|
Cruz CD, Fletcher GC, Paturi G, Hedderley DI. Influence of farming methods and seawater depth on Vibrio species in New Zealand Pacific oysters. Int J Food Microbiol 2020; 325:108644. [DOI: 10.1016/j.ijfoodmicro.2020.108644] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 04/01/2020] [Accepted: 04/18/2020] [Indexed: 10/24/2022]
|
20
|
Kyere EO, Foong G, Palmer J, Wargent JJ, Fletcher GC, Flint S. Biofilm formation of Listeria monocytogenes in hydroponic and soil grown lettuce leaf extracts on stainless steel coupons. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.109114] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
21
|
Bretones IS, Thu KL, Silvester J, Kiarash R, Fletcher GC, Cruickshank J, Bray MR, Mak TW, Cescon DW. Abstract PD2-03: CDK4/6 inhibitor-resistant ER+ breast cancer cell lines are hypersensitive to TTK inhibition. Cancer Res 2020. [DOI: 10.1158/1538-7445.sabcs19-pd2-03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Inhibitors of cyclin-dependent kinases 4 and 6 (CDK4/6i), in combination with hormonal therapies, have become standard of care for the treatment of estrogen receptor-positive (ER+)/HER2-negative metastatic breast cancer. Despite demonstrating significant improvements in progression-free survival, acquired resistance to these inhibitors invariably develops. Recent analyses of clinical samples have identified emergent genomic alterations conferring acquired resistance to CDK4/6i, and begin to define the biology of this new clinical entity. Discovery of vulnerabilities of CDK4/6i-resistant tumours is imperative to improve the survival of this group of patients. We modeled CDK4/6i resistance in ER+ breast cancer cell lines using two complementary approaches: (1) spontaneous development of resistance upon continuous exposure to the palbociclib for 6-9 months, and (2) genetic engineering of RB1 loss of function. In both cases, palbociclib resistance was confirmed by colony formation and cell proliferation assays. To identify potential therapeutic strategies for CDK4/6i-resistant cells, we tested the in vitro activity of novel cell cycle inhibitors using sulforhodamine B (SRB) cytotoxicity assays. CFI-402257, a selective TTK inhibitor now in Phase I testing, induced significantly increased cytotoxicity in different CDK4/6i-resistant models compared to parental cell lines, including but not exclusively those with RB1 loss. CFI-402257 treatment caused defects in cell cycle progression and increased DNA damage and genomic instability in CDK4/6i-resistant cells, while these effects were mild in parental, CDK4/6i-sensitive cell lines. In some cases, these phenotypes were accompanied by an increase in apoptotic signaling. Analysis of the molecular determinants of these effects are being evaluated (additional results will be presented). In xenografts derived from MCF7 cells, CFI-402257 treatment completely abrogated the growth of RB1-KO tumours and had a much less pronounced effect on wild-type tumours. In summary, our results nominate the TTK inhibitor CFI-402257 as a promising therapeutic strategy for breast cancer patients who progress after CDK4/6 inhibition. A clinical trial testing this strategy is being launched.
Citation Format: Isabel Soria Bretones, Kelsie L Thu, Jennifer Silvester, Reza Kiarash, Graham C Fletcher, Jennifer Cruickshank, Mark R Bray, Tak W Mak, David W Cescon. CDK4/6 inhibitor-resistant ER+ breast cancer cell lines are hypersensitive to TTK inhibition [abstract]. In: Proceedings of the 2019 San Antonio Breast Cancer Symposium; 2019 Dec 10-14; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2020;80(4 Suppl):Abstract nr PD2-03.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Mark R Bray
- 1University Health Network, Toronto, ON, Canada
| | - Tak W Mak
- 2University Health Network and Department of Biophysics, University of Toronto, Toronto, ON, Canada
| | - David W Cescon
- 3University Health Network and Department of Medicine, University of Toronto, Toronto, ON, Canada
| |
Collapse
|
22
|
Mohan V, Wibisono R, de Hoop L, Summers G, Fletcher GC. Identifying Suitable Listeria innocua Strains as Surrogates for Listeria monocytogenes for Horticultural Products. Front Microbiol 2019; 10:2281. [PMID: 31649633 PMCID: PMC6794387 DOI: 10.3389/fmicb.2019.02281] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 04/11/2019] [Accepted: 09/18/2019] [Indexed: 11/13/2022] Open
Abstract
A laboratory-based study testing 9 Listeria innocua strains independently and a cocktail of 11 Listeria monocytogenes strains was carried out. The aim was to identify suitable L. innocua strain(s) to model L. monocytogenes in inactivation experiments. Three separate inactivation procedures and a hurdle combination of the three were employed: thermal inactivation (55°C), UV-C irradiation (245 nm), and chemical sanitizer (TsunamiTM 100, a mixture of acetic acid, peroxyacetic acid, and hydrogen peroxide). The responses were strain dependent in the case of L. innocua with different strains responding differently to different regimes and L. innocua isolates generally responded differently to the L. monocytogenes cocktail. In the thermal inactivation treatment, inactivation of all strains including the L. monocytogenes cocktail plateaued after 120 min. In the case of chemical sanitizer, inactivation could be achieved at concentrations of 10 and 20 ppm with inactivation increasing with contact time up to 8 min, beyond which there was no significant benefit. All L. innocua strains except PFR16D08 were more sensitive than the L. monocytogenes cocktail to the hurdle treatment. PFR16D08 almost matched the resistance of the L. monocytogenes cocktail but was much more resistant to the individual treatments. A cocktail of two L. innocua strains (PFR 05A07 and PFR 05A10) had the closest responses to the hurdle treatment to those of the L. monocytogenes cocktail and is therefore recommended for hurdle experiments.
Collapse
Affiliation(s)
| | | | | | | | - Graham C. Fletcher
- Food Safety and Preservation Team, The New Zealand Institute for Plant & Food Research Limited, Auckland, New Zealand
| |
Collapse
|
23
|
Kyere EO, Foong G, Palmer J, Wargent JJ, Fletcher GC, Flint S. Rapid attachment of Listeria monocytogenes to hydroponic and soil grown lettuce leaves. Food Control 2019. [DOI: 10.1016/j.foodcont.2019.02.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
24
|
|
25
|
Affiliation(s)
- Emmanuel O. Kyere
- Institute of Food Science and Technology; School of Food and Nutrition; Massey University; Private Bag 11222 Palmerston North New Zealand
| | - Jon Palmer
- Institute of Food Science and Technology; School of Food and Nutrition; Massey University; Private Bag 11222 Palmerston North New Zealand
| | - Jason J. Wargent
- Institute of Agriculture & Environment; Massey University; Private Bag 11222 Palmerston North New Zealand
| | - Graham C. Fletcher
- The New Zealand Institute for Plant & Food Research Limited; Private Bag 92169 Auckland 1142 New Zealand
| | - Steve Flint
- Institute of Food Science and Technology; School of Food and Nutrition; Massey University; Private Bag 11222 Palmerston North New Zealand
| |
Collapse
|
26
|
Nowak J, Cruz CD, Tempelaars M, Abee T, van Vliet AHM, Fletcher GC, Hedderley D, Palmer J, Flint S. Persistent Listeria monocytogenes strains isolated from mussel production facilities form more biofilm but are not linked to specific genetic markers. Int J Food Microbiol 2017; 256:45-53. [PMID: 28599174 DOI: 10.1016/j.ijfoodmicro.2017.05.024] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [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: 03/12/2017] [Revised: 05/29/2017] [Accepted: 05/30/2017] [Indexed: 10/19/2022]
Abstract
Contamination of mussels with the human pathogen Listeria monocytogenes occurs during processing in the factory, possibly from bacteria persisting in the factory's indoor and outdoor areas. In this study, a selection of persistent (n=8) and sporadic (n=8) L. monocytogenes isolates associated with mussel-processing premises in New Zealand were investigated for their phenotypic and genomic characteristics. To identify traits that favour or contribute to bacterial persistence, biofilm formation, heat resistance, motility and recovery from dry surfaces were compared between persistent and sporadic isolates. All isolates exhibited low biofilm formation at 20°C, however, at 30°C persistent isolates showed significantly higher biofilm formation after 48h using cell enumeration and near significant difference using the crystal violet assay. All 16 isolates were motile at 20°C and 30°C and motility was fractionally higher for sporadic isolates, but no significant difference was observed. We found persistent isolates tend to exhibit greater recovery after incubation on dry surfaces compared to sporadic isolates. Two of the three most heat-resistant isolates were persistent, while four of five isolates lacking heat resistance were sporadic isolates. Comparison of genome sequences of persistent and sporadic isolates showed that there was no overall clustering of persistent or sporadic isolates, and that differences in prophages and plasmids were not associated with persistence. Our results suggest a link between persistence and biofilm formation, which is most likely multifactorial, combining subtle phenotypic and genotypic differences between isolates.
Collapse
Affiliation(s)
- Jessika Nowak
- The New Zealand Institute for Plant & Food Research Limited, Mt Albert, Auckland, New Zealand; Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand.
| | - Cristina D Cruz
- Division of Pharmaceutical Biosciences, Faculty of Pharmacy, Centre for Drug Research, University of Helsinki, Helsinki, Finland
| | - Marcel Tempelaars
- Laboratory of Food Microbiology, Wageningen University, Wageningen, The Netherlands
| | - Tjakko Abee
- Laboratory of Food Microbiology, Wageningen University, Wageningen, The Netherlands
| | - Arnoud H M van Vliet
- Department of Pathology and Infectious Diseases, School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom
| | - Graham C Fletcher
- The New Zealand Institute for Plant & Food Research Limited, Mt Albert, Auckland, New Zealand
| | - Duncan Hedderley
- The New Zealand Institute for Plant & Food Research Limited, Palmerston North, New Zealand
| | - Jon Palmer
- Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| | - Steve Flint
- Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| |
Collapse
|
27
|
Widsten P, Mesic BB, Cruz CD, Fletcher GC, Chycka MA. Inhibition of foodborne bacteria by antibacterial coatings printed onto food packaging films. J Food Sci Technol 2017; 54:2379-2386. [PMID: 28740295 DOI: 10.1007/s13197-017-2678-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 04/27/2017] [Accepted: 05/01/2017] [Indexed: 10/19/2022]
Abstract
Films containing antibacterial compounds could be used for packaging perishable foods such as fresh fish and meat for sea freighting over long distances. However, existing commercialised options (films with nanosilver zeolites or wasabi extract) are only permitted for food contact in certain regions and films containing alternative antibacterial ingredients are required e.g. for exports to Europe. Certain non-volatile phenolic plant extracts have shown promising antibacterial activity against a wide range of foodborne bacteria in in vitro assays and when integrated in coatings for perishable foods such as fish and meat. Extracts rich in gallotannins tend to show stronger antibacterial effects than other phenols such as flavonoids. Such extracts could be coated onto commercial barrier films by means of flexographic printing-a more industrially feasible option than rod coating or solvent casting typically used in antibacterial coating research. The goal of the present work was to investigate the antibacterial effect of printed latex coatings containing extracts rich in gallotannins and other types of phenolic compounds against 16 common spoilage and pathogenic bacteria of fish and meat. The largest zones of inhibition in disk diffusion assays were obtained with plastic films with coatings containing tannic acid alone, followed by tannic acid with phenolic-rich extracts of feijoa skin or mango seed. Significant inhibition was seen for all bacteria. This study shows that coatings with gallotannins as the main active ingredient can be printed onto commercial barrier films to control the bacteria that limit the shelf-life of fresh fish and meat.
Collapse
Affiliation(s)
- P Widsten
- Scion, Private Bag 3020, Rotorua, 3046 New Zealand
| | - B B Mesic
- Scion, Private Bag 3020, Rotorua, 3046 New Zealand
| | - C D Cruz
- The New Zealand Institute for Plant and Food Research Limited, Private Bag 92169, Auckland, 1142 New Zealand
| | - G C Fletcher
- The New Zealand Institute for Plant and Food Research Limited, Private Bag 92169, Auckland, 1142 New Zealand
| | - M A Chycka
- The New Zealand Institute for Plant and Food Research Limited, Private Bag 92169, Auckland, 1142 New Zealand
| |
Collapse
|
28
|
Laufer R, Li SW, Liu Y, Ng G, Lang Y, Feher M, Brokx R, Beletskaya I, Hodgson R, Mao G, Plotnikova O, Awrey DE, Mason JM, Wei X, Lin DCC, Che Y, Kiarash R, Madeira B, Fletcher GC, Mak TW, Bray MR, Pauls HW. Discovery of 4-(4-aminopyrazolo[1,5-a][1,3,5]triazin-8-yl)benzamides as novel, highly potent and selective, orally bioavailable inhibitors of Tyrosine Threonine Kinase, TTK. Bioorg Med Chem Lett 2016; 26:3562-6. [DOI: 10.1016/j.bmcl.2016.06.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 05/31/2016] [Accepted: 06/08/2016] [Indexed: 12/13/2022]
|
29
|
Liu Y, Laufer R, Patel NK, Ng G, Sampson PB, Li SW, Lang Y, Feher M, Brokx R, Beletskaya I, Hodgson R, Plotnikova O, Awrey DE, Qiu W, Chirgadze NY, Mason JM, Wei X, Lin DCC, Che Y, Kiarash R, Fletcher GC, Mak TW, Bray MR, Pauls HW. Discovery of Pyrazolo[1,5-a]pyrimidine TTK Inhibitors: CFI-402257 is a Potent, Selective, Bioavailable Anticancer Agent. ACS Med Chem Lett 2016; 7:671-5. [PMID: 27437075 DOI: 10.1021/acsmedchemlett.5b00485] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [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: 12/14/2015] [Accepted: 04/26/2016] [Indexed: 01/05/2023] Open
Abstract
This work describes a scaffold hopping exercise that begins with known imidazo[1,2-a]pyrazines, briefly explores pyrazolo[1,5-a][1,3,5]triazines, and ultimately yields pyrazolo[1,5-a]pyrimidines as a novel class of potent TTK inhibitors. An X-ray structure of a representative compound is consistent with 1(1)/2 type inhibition and provides structural insight to aid subsequent optimization of in vitro activity and physicochemical and pharmacokinetic properties. Incorporation of polar moieties in the hydrophobic and solvent accessible regions modulates physicochemical properties while maintaining potency. Compounds with enhanced oral exposure were identified for xenograft studies. The work culminates in the identification of a potent (TTK K i = 0.1 nM), highly selective, orally bioavailable anticancer agent (CFI-402257) for IND enabling studies.
Collapse
Affiliation(s)
- Yong Liu
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Radoslaw Laufer
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Narendra Kumar Patel
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Grace Ng
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Peter B. Sampson
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Sze-Wan Li
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Yunhui Lang
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Miklos Feher
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Richard Brokx
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Irina Beletskaya
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Richard Hodgson
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Olga Plotnikova
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Donald E. Awrey
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Wei Qiu
- Campbell
Family Cancer Research Institute, University Health Network, Princess
Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2C4, Canada
| | - Nickolay Y. Chirgadze
- Campbell
Family Cancer Research Institute, University Health Network, Princess
Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2C4, Canada
| | - Jacqueline M. Mason
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Xin Wei
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Dan Chi-Chia Lin
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Yi Che
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Reza Kiarash
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Graham C. Fletcher
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Tak W. Mak
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Mark R. Bray
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Henry W. Pauls
- Campbell
Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| |
Collapse
|
30
|
Nowak J, Cruz CD, Palmer J, Fletcher GC, Flint S. Biofilm formation of the L. monocytogenes strain 15G01 is influenced by changes in environmental conditions. J Microbiol Methods 2015; 119:189-95. [PMID: 26524221 DOI: 10.1016/j.mimet.2015.10.022] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 10/27/2015] [Accepted: 10/28/2015] [Indexed: 02/06/2023]
Abstract
Listeria monocytogenes 15G01, a strain belonging to the persistent pulsotype 5132, was isolated from a seafood processing plant in New Zealand. Simple monoculture assays using crystal violet staining showed good biofilm formation for this strain and it was therefore chosen to be further investigated in regard to its biofilm forming ability. To evaluate its behaviour in different conditions commonly encountered in food processing environments, biofilm assays and growth studies were performed using common laboratory media under a range of temperatures (20 °C, 30 °C and 37 °C). Furthermore, the effects of incubation time and different environmental conditions including static, dynamic and anaerobic incubation on biofilm formation were investigated. Changes in the environmental conditions resulted in different biofilm phenotypes of L. monocytogenes 15G01. We demonstrated that increasing temperature and incubation time led to a higher biofilm mass and that dynamic incubation has little effect on biofilm formation at 37 °C but encourages biofilm formation at 30 °C. Biofilm production at 20 °C was minimal regardless of the medium used. We furthermore observed that anaerobic environment led to reduced biofilm mass at 30 °C for all tested media but not at 37 °C. Biofilm formation could not be narrowed down to one factor but was rather dependent on multiple factors with temperature and medium having the biggest effects.
Collapse
Affiliation(s)
- Jessika Nowak
- The New Zealand Institute for Plant & Food Research Limited, Mt Albert, Auckland, New Zealand; Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand.
| | - Cristina D Cruz
- The New Zealand Institute for Plant & Food Research Limited, Mt Albert, Auckland, New Zealand
| | - Jon Palmer
- Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| | - Graham C Fletcher
- The New Zealand Institute for Plant & Food Research Limited, Mt Albert, Auckland, New Zealand
| | - Steve Flint
- Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
| |
Collapse
|
31
|
Liu Y, Lang Y, Patel NK, Ng G, Laufer R, Li SW, Edwards L, Forrest B, Sampson PB, Feher M, Ban F, Awrey DE, Beletskaya I, Mao G, Hodgson R, Plotnikova O, Qiu W, Chirgadze NY, Mason JM, Wei X, Lin DCC, Che Y, Kiarash R, Madeira B, Fletcher GC, Mak TW, Bray MR, Pauls HW. The Discovery of Orally Bioavailable Tyrosine Threonine Kinase (TTK) Inhibitors: 3-(4-(heterocyclyl)phenyl)-1H-indazole-5-carboxamides as Anticancer Agents. J Med Chem 2015; 58:3366-92. [DOI: 10.1021/jm501740a] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yong Liu
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Yunhui Lang
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Narendra Kumar Patel
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Grace Ng
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Radoslaw Laufer
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Sze-Wan Li
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Louise Edwards
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Bryan Forrest
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Peter B. Sampson
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Miklos Feher
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Fuqiang Ban
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Donald E. Awrey
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Irina Beletskaya
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Guodong Mao
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Richard Hodgson
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Olga Plotnikova
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Wei Qiu
- Campbell Family
Cancer Research Institute, University Health Network, Princess Margaret
Cancer Centre, 610 University Avenue, Toronto, Ontario M5G 2C4, Canada
| | - Nickolay Y. Chirgadze
- Campbell Family
Cancer Research Institute, University Health Network, Princess Margaret
Cancer Centre, 610 University Avenue, Toronto, Ontario M5G 2C4, Canada
| | - Jacqueline M. Mason
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Xin Wei
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Dan Chi-Chia Lin
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Yi Che
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Reza Kiarash
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Brian Madeira
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Graham C. Fletcher
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Tak W. Mak
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Mark R. Bray
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| | - Henry W. Pauls
- Campbell Family Institute for Breast Cancer Research, University Health Network, TMDT East Tower, MaRS Centre, 101 College Street, Toronto, Ontario M5G 1L7, Canada
| |
Collapse
|
32
|
Gupta S, Farid MM, Fletcher GC, Melton LD. Color, Yield, and Texture of Heat and High Pressure Processed Mussels During Ice Storage. Journal of Aquatic Food Product Technology 2015. [DOI: 10.1080/10498850.2012.758682] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
33
|
Widsten P, Cruz CD, Fletcher GC, Pajak MA, McGhie TK. Tannins and extracts of fruit byproducts: antibacterial activity against foodborne bacteria and antioxidant capacity. J Agric Food Chem 2014; 62:11146-56. [PMID: 25339414 DOI: 10.1021/jf503819t] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [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: 05/04/2023]
Abstract
The shelf life of fresh fish and meat transported over long distances could be extended by using plant-based extracts to control spoilage bacteria. The goals of the present study were to identify plant-based extracts that effectively suppress the main spoilage bacteria of chilled fish and lamb and to assess their antioxidant capacity. The phenolic compounds in wood-based tannins and extracts isolated from byproducts of the fruit processing industry were identified and/or quantified. The total phenol content, but not the flavonoid to total phenol ratio, was strongly associated with higher antibacterial activity against several fish and lamb spoilage bacteria in zone of inhibition and minimum inhibitory concentration assays as well as greater antioxidant capacity in the DPPH (2,2-diphenyl-1-picrylhydrazyl) radical assay. The most promising compounds in both cases, and thus good candidates for antibacterial packaging or antioxidant dietary supplements, were mango seed extract and tannic acid containing mostly polygalloyl glucose type phenols.
Collapse
|
34
|
Balaban MO, Stewart K, Fletcher GC, Alçiçek Z. Color change of the snapper (Pagrus auratus) and Gurnard (Chelidonichthys kumu) skin and eyes during storage: effect of light polarization and contact with ice. J Food Sci 2014; 79:E2456-62. [PMID: 25384622 DOI: 10.1111/1750-3841.12693] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [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: 07/15/2014] [Accepted: 09/16/2014] [Indexed: 11/29/2022]
Abstract
Ten gurnard and 10 snapper were stored on ice. One side always contacted the ice; the other side was always exposed to air. At different intervals for up to 12 d, the fish were placed in a light box, and the images of both sides were taken using polarized and nonpolarized illumination. Image analysis resulted in average L*, a*, and b* values of skin, and average L* values of the eyes. The skin L* value of gurnard changed significantly over time while that of snapper was substantially constant. The a* and b* values of both fish decreased over time. The L* values of eyes were significantly lower for polarized images, and significantly lower for the side of fish exposed to air only. This may be a concern in quality evaluation methods such as QIM. The difference of colors between the polarized and nonpolarized images was calculated to quantify the reflection off the surface of fish. For accurate measurement of surface color and eye color, use of polarized light is recommended.
Collapse
Affiliation(s)
- Murat O Balaban
- Chemical and Materials Engineering Dept, Univ. of Auckland, 20 Symonds St, Auckland, 1010, New Zealand
| | | | | | | |
Collapse
|
35
|
Mason JM, Lin DCC, Wei X, Che Y, Yao Y, Kiarash R, Cescon DW, Fletcher GC, Awrey DE, Bray MR, Pan G, Mak TW. Functional characterization of CFI-400945, a Polo-like kinase 4 inhibitor, as a potential anticancer agent. Cancer Cell 2014; 26:163-76. [PMID: 25043604 DOI: 10.1016/j.ccr.2014.05.006] [Citation(s) in RCA: 135] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 03/04/2014] [Accepted: 05/12/2014] [Indexed: 11/17/2022]
Abstract
PLK4 was identified as a promising therapeutic target through a systematic approach that combined RNAi screening with gene expression analysis in human breast cancers and cell lines. A drug discovery program culminated in CFI-400945, a potent and selective PLK4 inhibitor. Cancer cells treated with CFI-400945 exhibit effects consistent with PLK4 kinase inhibition, including dysregulated centriole duplication, mitotic defects, and cell death. Oral administration of CFI-400945 to mice bearing human cancer xenografts results in the significant inhibition of tumor growth at doses that are well tolerated. Increased antitumor activity in vivo was observed in PTEN-deficient compared to PTEN wild-type cancer xenografts. Our findings provide a rationale for the clinical evaluation of CFI-400945 in patients with solid tumors, in particular those deficient in PTEN.
Collapse
Affiliation(s)
- Jacqueline M Mason
- The Campbell Family Institute for Breast Cancer Research, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - Dan Chi-Chia Lin
- The Campbell Family Institute for Breast Cancer Research, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - Xin Wei
- The Campbell Family Institute for Breast Cancer Research, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - Yi Che
- The Campbell Family Institute for Breast Cancer Research, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - Yi Yao
- The Campbell Family Institute for Breast Cancer Research, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - Reza Kiarash
- The Campbell Family Institute for Breast Cancer Research, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - David W Cescon
- The Campbell Family Institute for Breast Cancer Research, 620 University Avenue, Toronto, ON M5G 2M9, Canada
| | - Graham C Fletcher
- The Campbell Family Institute for Breast Cancer Research, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - Donald E Awrey
- The Campbell Family Institute for Breast Cancer Research, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - Mark R Bray
- The Campbell Family Institute for Breast Cancer Research, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - Guohua Pan
- The Campbell Family Institute for Breast Cancer Research, 101 College Street, Toronto, ON M5G 1L7, Canada
| | - Tak W Mak
- The Campbell Family Institute for Breast Cancer Research, 620 University Avenue, Toronto, ON M5G 2M9, Canada.
| |
Collapse
|
36
|
Affiliation(s)
- Aishath Naila
- Institute of Food Nutrition and Human Health; Massey University; Private Bag 11-222 Palmerston North 4442 New Zealand
| | - Steve Flint
- Institute of Food Nutrition and Human Health; Massey University; Private Bag 11-222 Palmerston North 4442 New Zealand
| | - Graham C. Fletcher
- Food Safety & Preservation; New Zealand Institute for Plant & Food Research Limited; Auckland New Zealand
| | - Phil J. Bremer
- Department of Food Science; University of Otago; Dunedin New Zealand
| | - Gerrit Meerdink
- Department of Food Manufacture and Automation; University of Lincoln - Holbeach Campus; Holbeach UK
| |
Collapse
|
37
|
Navaranjan N, Fletcher GC, Summers G, Parr R, Anderson R. Thermal insulation requirements and new cardboard packaging for chilled seafood exports. J FOOD ENG 2013. [DOI: 10.1016/j.jfoodeng.2013.05.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
38
|
Mohamed S, Flint S, Palmer J, Fletcher GC, Pitt JI. An extension of the Coconut Cream Agar method to screen Penicillium citrinum isolates for citrinin production. Lett Appl Microbiol 2013; 57:214-9. [PMID: 23682683 DOI: 10.1111/lam.12102] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [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: 02/26/2013] [Revised: 05/04/2013] [Accepted: 05/07/2013] [Indexed: 11/28/2022]
Abstract
A simple and rapid screening method was developed for the detection of citrinin in fungal cultures using Coconut Cream Agar (CCA) described previously for detecting aflatoxin and ochratoxin A. Fifteen isolates of Penicillium citrinum were inoculated onto CCA and incubated at 25 and 30°C for 10 days. All isolates produced a distinct yellow green fluorescence on CCA when the reverse side of the agar plates were viewed under long wavelength UV light. Detection was optimal at 25°C after four to 5 days of incubation. Isolates positive by the CCA method also tested positive for citrinin production by the TLC agar plug method after growth on CCA, Czapek yeast extract agar and yeast extract sucrose agar. Control cultures were negative by both methods, indicating that the CCA Petri dish method was suitable for screening cultures for citrinin production.
Collapse
Affiliation(s)
- S Mohamed
- Institute of Food Nutrition and Human Health, Massey University, Palmerston North, New Zealand.
| | | | | | | | | |
Collapse
|
39
|
Woolf AB, Wibisono R, Farr J, Hallett I, Richter L, Oey I, Wohlers M, Zhou J, Fletcher GC, Requejo-Jackman C. Effect of high pressure processing on avocado slices. INNOV FOOD SCI EMERG 2013. [DOI: 10.1016/j.ifset.2013.02.011] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
40
|
Diamond JR, Eckhardt SG, Tan AC, Newton TP, Selby HM, Brunkow KL, Kachaeva MI, Varella-Garcia M, Pitts TM, Bray MR, Fletcher GC, Tentler JJ. Predictive biomarkers of sensitivity to the aurora and angiogenic kinase inhibitor ENMD-2076 in preclinical breast cancer models. Clin Cancer Res 2012; 19:291-303. [PMID: 23136197 DOI: 10.1158/1078-0432.ccr-12-1611] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
PURPOSE The Aurora kinases are a family of conserved serine-threonine kinases with key roles in mitotic cell division. As with other promising anticancer targets, patient selection strategies to identify a responsive subtype will likely be required for successful clinical development of Aurora kinase inhibitors. The purpose of this study was to evaluate the antitumor activity of the Aurora and angiogenic kinase inhibitor ENMD-2076 against preclinical models of breast cancer with identification of candidate predictive biomarkers. EXPERIMENTAL DESIGN Twenty-nine breast cancer cell lines were exposed to ENMD-2076 and the effects on proliferation, apoptosis, and cell-cycle distribution were evaluated. In vitro activity was confirmed in MDA-MB-468 and MDA-MB-231 triple-negative breast cancer xenografts. Systematic gene expression analysis was used to identify up- and downregulated pathways in the sensitive and resistant cell lines, including within the triple-negative breast cancer subset. RESULTS ENMD-2076 showed antiproliferative activity against breast cancer cell lines, with more robust activity against cell lines lacking estrogen receptor expression and those without increased HER2 expression. Within the triple-negative breast cancer subset, cell lines with a p53 mutation and increased p53 expression were more sensitive to the cytotoxic and proapoptotic effects of ENMD-2076 exposure than cell lines with decreased p53 expression. CONCLUSIONS ENMD-2076 exhibited robust anticancer activity against models of triple-negative breast cancer and the candidate predictive biomarkers identified in this study may be useful in selecting patients for Aurora kinase inhibitors in the future.
Collapse
Affiliation(s)
- Jennifer R Diamond
- Division of Medical Oncology, Department of Medicine, University of Colorado Cancer Center, Aurora, CO 80045, USA.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Naila A, Flint S, Fletcher GC, Bremer PJ, Meerdink G, Morton RH. Prediction of the amount and rate of histamine degradation by diamine oxidase (DAO). Food Chem 2012; 135:2650-60. [PMID: 22980854 DOI: 10.1016/j.foodchem.2012.07.022] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Revised: 06/29/2012] [Accepted: 07/05/2012] [Indexed: 11/19/2022]
Abstract
Histamine is a biogenic amine that forms in a variety of foods and can cause food poisoning at high concentrations (>500 ppm). In situations where the formation of histamine in food cannot be prevented through refrigeration, diamine oxidase (DAO) enzyme may be used to degrade histamine to safe levels. The aims of this work were to apply DAO in model (buffer) and real (cooked tuna soup used in the manufacture of a fish paste product, Rihaakuru) systems, in order to obtain predictions for the rates and amounts of histamine degradation. The two systems were set up with a constant concentration of histamine (500 mg/L) and the DAO enzyme (2534 units/L) at a temperature of 37°C, agitation at 100 rpm and an incubation time of 10h with variable pH (5-7) and salt concentrations (1-5%). A total of 15 experiments were designed for each system using central composite design (CCD). The data from these experiments were fitted into regression models; initially the data were used to generate an exponential decline model and then the data from this were fitted into a secondary response surface model (RSM) to predict the rate and amount of histamine degradation by DAO. The model system results indicated that DAO activity was not significantly affected by salt (p>0.05), and that activity reached a maximum within the pH range of 6-6.5 with an optimum at pH 6.3. However, the results obtained with the tuna soup model showed that the optimum oxidation of histamine using DAO occurred between pH 6-7 and salt 1-3%. This study defined the conditions for the use of DAO to degrade 500 mg/L of histamine in tuna soup used to manufacture Rihaakuru. The models generated could also be used to predict the rate and amount of histamine degradation in other foods that have similar characteristics to tuna soup.
Collapse
Affiliation(s)
- A Naila
- Institute of Food Nutrition and Human Health, Massey University, New Zealand.
| | | | | | | | | | | |
Collapse
|
42
|
Cruz CD, Fletcher GC. Assessing manufacturers' recommended concentrations of commercial sanitizers on inactivation of Listeria monocytogenes. Food Control 2012. [DOI: 10.1016/j.foodcont.2012.01.041] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
43
|
Naila A, Flint S, Fletcher GC, Bremer PJ, Meerdink G. Histamine stability in Rihaakuru at -80, 4 and 30°C. Food Chem 2012; 135:1226-9. [PMID: 22953847 DOI: 10.1016/j.foodchem.2012.05.066] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 03/08/2012] [Accepted: 05/16/2012] [Indexed: 10/28/2022]
Abstract
Rihaakuru is a shelf stable fish paste product formed from a fish soup prepared from tuna. Histamine contamination is a food safety issue with this product that is manufactured from tuna fish that has been temperature abused. Histamine concentrations decreased between 31% and 73% in Rihaakuru stored for 10months at either -80, 4 or 30°C. This appears to be a property of the product as histamine solutions are reported to be stable, at least under frozen storage. The risk of histamine food poisoning due to Rihaakuru may reduce during the storage of the product.
Collapse
Affiliation(s)
- Aishath Naila
- Institute of Food Nutrition and Human Health, Massey University, Private Bag 11-222, Palmerston North, New Zealand.
| | | | | | | | | |
Collapse
|
44
|
Cruz CD, Win JK, Chantarachoti J, Mutukumira AN, Fletcher GC. Comparing rapid methods for detecting Listeria in seafood and environmental samples using the most probably number (MPN) technique. Int J Food Microbiol 2012; 153:483-7. [DOI: 10.1016/j.ijfoodmicro.2011.12.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Revised: 12/01/2011] [Accepted: 12/07/2011] [Indexed: 10/14/2022]
|
45
|
Diamond JR, Eckhardt SG, Tan AC, Selby HM, Newton TP, Pitts TM, Bray MR, Fletcher GC, Tentler JJ. P3-01-08: In Vitro and In Vivo Antitumor Activity of the Aurora and Angiogenic Kinase Inhibitor ENMD-2076 in Triple-Negative Breast Cancer Models. Cancer Res 2011. [DOI: 10.1158/0008-5472.sabcs11-p3-01-08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background
Triple-negative breast cancer (TNBC) is an aggressive biologic subtype which lacks effective targeted anti-cancer agents and is characterized by a high mitotic index and dependence on angiogenesis. ENMD-2076 is a novel orally bioavailable Aurora and angiogenic kinase inhibitor currently in clinical development with favorable pharmacokinetics and a manageable toxicity profile. The purpose of this study was to use TNBC cell line-based in vitro and in vivo models to demonstrate the antitumor activity of ENMD-2076 towards this breast cancer subtype compared to the luminal and HER2−amplified subtypes. Additionally, we used baseline gene expression profiling and pathway analysis to explore molecular predictors of responsiveness to ENMD-2076 in TNBC.
Methods: Twenty-five breast cancer cell lines were exposed to ENMD-2076 and the effects on proliferation, apoptosis, and cell cycle distribution were evaluated. Proliferation was assessed using an SRB assay, apoptosis was analyzed using a caspase 3/7 assay and cell cycle was measured using flow cytometry. In vitro activity of ENMD-2076 was confirmed in 3-D cell culture and in MDA-MB-231 and MDA-MB-468 triple-negative breast cancer xenograft models and immunohistochemical analysis was performed for phosphor-histone H3 (pHH3). Gene array and gene set enrichment analysis (GSEA) was used to identify pathways differentially regulated in the sensitive and resistance cell lines, including within the triple-negative breast cancer subset.
Results: In vitro exposure to ENMD-2076 resulted in robust inhibition of proliferation in TNBC cell lines which was associated with a G2 cell cycle arrest and induction of caspase-dependent apoptosis. Of the TNBC cell lines screened, 1 of 10 had a mean IC50 value > 5 μmol/L and 7 of 10 had a mean IC50 ≤ 1 μmol/L (Fisher's exact test, p-value = 0.009). In comparison, only 1 luminal (ER+) and one UER2-amplified breast cancer cell line had an IC50 value < 1, whereas 7 and 5 resistant lines were luminal and HER2−amplified, respectively (Fisher's exact test, p-values = 0.02 and 0.11 for ER and HER2 status, respectively). ENMD-2076 exhibited antitumor activity towards MDA-MD-231 and MDA-MB-468 xenograft models of TNBC with statistically significant tumor growth inhibition compared to vehicle control (p< 0.05 and p< 0.01, respectively). A trend towards an increase in pHH3 staining cells in the MDA-MB-231 ENMD-2076 treated group compared to the vehicle control group was observed; however, this was not statistically significant (104.7 ± 36.2 positive cells/mm2 in treated vs. 79.9 ± 34.5 in control). Using significance of analysis of microarrays (SAM) analysis and GSEA, we identified Ran, a member of the mitotic spindle regulation pathway as upregulated in sensitive TNBC cell lines (p = 0.017). Interestingly, AURKA, the main target of ENMD-2076, is a core gene in this pathway.
Conclusions: ENMD-2076 exhibited robust anticancer activity towards preclinical models of TNBC, supporting future clinical investigations of this agent in TNBC with an emphasis on the continued development of biomarkers predictive of response in this breast cancer subset.
Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr P3-01-08.
Collapse
Affiliation(s)
- JR Diamond
- 1University of Colorado Cancer Center, Aurora, CO; EntreMed, Inc, Toronto, ON, Canada
| | - SG Eckhardt
- 1University of Colorado Cancer Center, Aurora, CO; EntreMed, Inc, Toronto, ON, Canada
| | - AC Tan
- 1University of Colorado Cancer Center, Aurora, CO; EntreMed, Inc, Toronto, ON, Canada
| | - HM Selby
- 1University of Colorado Cancer Center, Aurora, CO; EntreMed, Inc, Toronto, ON, Canada
| | - TP Newton
- 1University of Colorado Cancer Center, Aurora, CO; EntreMed, Inc, Toronto, ON, Canada
| | - TM Pitts
- 1University of Colorado Cancer Center, Aurora, CO; EntreMed, Inc, Toronto, ON, Canada
| | - MR Bray
- 1University of Colorado Cancer Center, Aurora, CO; EntreMed, Inc, Toronto, ON, Canada
| | - GC Fletcher
- 1University of Colorado Cancer Center, Aurora, CO; EntreMed, Inc, Toronto, ON, Canada
| | - JJ Tentler
- 1University of Colorado Cancer Center, Aurora, CO; EntreMed, Inc, Toronto, ON, Canada
| |
Collapse
|
46
|
Cruz CD, Fletcher GC. Prevalence and biofilm-forming ability of Listeria monocytogenes in New Zealand mussel (Perna canaliculus) processing plants. Food Microbiol 2011; 28:1387-93. [PMID: 21839390 DOI: 10.1016/j.fm.2011.06.014] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Revised: 06/10/2011] [Accepted: 06/22/2011] [Indexed: 10/18/2022]
Abstract
Greenshell™ mussels are New Zealand's largest seafood export species. Some export markets require compliance with 'zero' tolerance legislation for Listeria monocytogenes in 25 g of product. Even though individually quick frozen (IQF) mussel products are labeled 'to be cooked', and are not classified as ready-to-eat, some markets still require them to comply with the strict policy. Three mussel processing plants were assessed for the pattern of L. monocytogenes contamination on raw material, environment, food contact surfaces, and in the final product. Cultures (n = 101) obtained from an industrial Listeria monitoring program from August 2007 to June 2009 were characterized by serotyping and pulsed field gel electrophoresis. Using the crystal violet method, isolates were assessed for their ability to form biofilms. This work confirmed the presence of L. monocytogenes in raw and processed product, and the importance of cross-contamination from external and internal environments. Processing plants had L. monocytogenes pulsotypes that were detected more than once over 6 months. No correlation was found between biofilm-forming ability and persistent isolates. Two pulsotypes (including a persistent one), were previously isolated in human cases of listeriosis in New Zealand, but none of the pulsotypes matched those involved in international outbreaks.
Collapse
Affiliation(s)
- Cristina D Cruz
- The New Zealand Institute for Plant & Food Research Limited, Auckland 1025, New Zealand.
| | | |
Collapse
|
47
|
Fletcher GC, Brokx RD, Denny TA, Hembrough TA, Plum SM, Fogler WE, Sidor CF, Bray MR. ENMD-2076 is an orally active kinase inhibitor with antiangiogenic and antiproliferative mechanisms of action. Mol Cancer Ther 2010; 10:126-37. [PMID: 21177375 DOI: 10.1158/1535-7163.mct-10-0574] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
ENMD-2076 is a novel orally active, small molecule kinase inhibitor with a mechanism of action involving several pathways key to tumor growth and survival: angiogenesis, proliferation, and the cell cycle. ENMD-2076 has selective activity against the mitotic kinase Aurora A, as well as kinases involved in angiogenesis (VEGFRs, FGFRs). ENMD-2076 inhibited the growth in vitro of a wide range of human solid tumor and hematopoietic cancer cell lines with IC(50) values ranging from 0.025 to 0.7 μmol/L. ENMD-2076 was also shown to induce regression or complete inhibition of tumor growth in vivo at well-tolerated doses in tumor xenograft models derived from breast, colon, melanoma, leukemia, and multiple myeloma cell lines. Pharmacodynamic experiments in vivo showed that in addition to inhibiting Aurora A, single doses of ENMD-2076 had sustained inhibitory effects on the activation of Flt3 as well as the angiogenic tyrosine kinases, VEGFR2/KDR and FGFR1 and 2. ENMD-2076 was shown to prevent the formation of new blood vessels and regress formed vessels in vivo at doses equivalent to those that gave substantial activity in tumor xenograft models. These results indicate that ENMD-2076 is a well-tolerated, orally active multitarget kinase inhibitor with a unique antiangiogenic/antiproliferative profile and provides strong preclinical support for use as a therapeutic for human cancers. Several phase 1 studies involving ENMD-2076 have been recently completed, and the compound is currently being evaluated in a phase 2 clinical trial in patients with platinum-resistant ovarian cancer.
Collapse
|
48
|
Diamond JR, Bastos BR, Hansen RJ, Gustafson DL, Eckhardt SG, Kwak EL, Pandya SS, Fletcher GC, Pitts TM, Kulikowski GN, Morrow M, Arnott J, Bray MR, Sidor C, Messersmith W, Shapiro GI. Phase I safety, pharmacokinetic, and pharmacodynamic study of ENMD-2076, a novel angiogenic and Aurora kinase inhibitor, in patients with advanced solid tumors. Clin Cancer Res 2010; 17:849-60. [PMID: 21131552 DOI: 10.1158/1078-0432.ccr-10-2144] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
PURPOSE ENMD-2076 is a unique orally bioavailable Aurora kinase and VEGFR inhibitor. The purpose of this phase 1 study of ENMD-2076 was to determine the MTD, pharmacokinetic, and pharmacodynamic profiles and preliminary antitumor activity. EXPERIMENTAL DESIGN Patients with refractory advanced solid malignancies were treated with ENMD-2076 orally with continuous once daily dosing. Doses from 60 to 200 mg/m(2) were evaluated using a standard 3 (to 4) + 3 design. Pharmacokinetic parameters were studied on days 1, 28, and 30 to 35 of cycle 1. Expanded MTD cohorts included patients with ovarian cancer, colorectal cancer, and refractory solid tumors. RESULTS A total of 67 patients (46 F, 21M; ages 30-76) entered the study. Dose levels of 60, 80, 120, 200, and 160 mg/m(2) were evaluated. Two patients experienced grade 3 hypertension at 200 mg/m(2), and additional grade 3 neutropenia events limited tolerability at this dose. An intermediate dose of 160 mg/m(2) was determined to be the MTD. The most common drug-related adverse events included hypertension, nausea/vomiting, and fatigue. The pharmacokinetics of ENMD-2076 were characterized by a rapid absorption phase (T(max) 3-7.8 hours), a t(1/2) of 27.3 to 38.3 hours after a single dose, and dose proportional exposure. Decreased plasma sVEGFR2 was observed posttreatment. Two patients with platinum refractory/resistant ovarian cancer had RECIST partial responses. CONCLUSIONS ENMD-2076 was well tolerated, had a linear pharmacokinetic profile, and showed promising antitumor activity, particularly in ovarian cancer. The recommended phase 2 dose of ENMD-2076 is 160 mg/m(2) administered orally once daily with continuous dosing.
Collapse
|
49
|
Naila A, Flint S, Fletcher GC, Bremer PJ, Meerdink G. Chemistry and microbiology of traditional Rihaakuru (fish paste) from the Maldives. Int J Food Sci Nutr 2010; 62:139-47. [PMID: 20883152 DOI: 10.3109/09637486.2010.515566] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Rihaakuru is a traditional Maldivian side dish consumed mainly with rice. It is a thick brown fish paste, made from tuna after prolonged heating. Samples tested were found to have a low water activity (0.55-0.8), slightly acidic pH (5.62-6.18) and moderate salt content (1.4-1.6%). The product was found to be rich in polyunsaturated fatty acids such as omega-3, had high protein content (56-59%) and an energy level of 13.8 kJ/g. The product had a low microbial count (1.54-2.31 log(10) cfu/g). The bacteria isolated belonged to the Bacillaceae (Genus Clostridium, and Bacillus), Streptococcaceae (Genus Streptococcus), Micrococcaceae (Genus Staphylococcus), and Corynebacterium. The product appears to be a nutritious and shelf-stable product.
Collapse
Affiliation(s)
- Aishath Naila
- Institute of Food Nutrition and Human Health, Massey University, Palmerston North, New Zealand.
| | | | | | | | | |
Collapse
|
50
|
Tentler JJ, Bradshaw-Pierce EL, Serkova NJ, Hasebroock KM, Pitts TM, Diamond JR, Fletcher GC, Bray MR, Eckhardt SG. Assessment of the in vivo antitumor effects of ENMD-2076, a novel multitargeted kinase inhibitor, against primary and cell line-derived human colorectal cancer xenograft models. Clin Cancer Res 2010; 16:2989-2998. [PMID: 20406842 DOI: 10.1158/1078-0432.ccr-10-0325] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
PURPOSE This in vivo study was designed to investigate the efficacy of ENMD-2076, a small-molecule kinase inhibitor with activity against the Aurora kinases A and B, and several other tyrosine kinases linked to cancer, including vascular endothelial growth factor receptor 2, cKit, and fibroblast growth factor receptor 1, against murine xenograft models of human colorectal cancer (CRC). EXPERIMENTAL DESIGN HT-29 CRC cell line xenografts were treated with either vehicle or ENMD-2076 (100 or 200 mg/kg) orally daily for 28 days. Tumor growth inhibition, dynamic contrast-enhanced magnetic resonance imaging, and (18)FDG-positron emission tomography were conducted to assess the antiproliferative, antiangiogenic, and antimetabolic responses, respectively. Effects on proliferation were also analyzed by immunohistochemical methods. Additionally, three patient-derived xenografts from primary and metastatic sites were treated with ENMD-2076 (100 mg/kg) and assessed for tumor growth inhibition. RESULTS In the HT-29 xenograft model, ENMD-2076 induced initial tumor growth inhibition followed by regression. Treatment was associated with significant tumor blanching, indicating a loss of vascularity and substantial reductions in tumor vascular permeability and perfusion as measured by dynamic contrast-enhanced magnetic resonance imaging. Positron emission tomography scanning showed significant decreases in (18)FDG uptake at days 3 and 21 of treatment, which was associated with a marked reduction in proliferation as assessed by Ki-67. All three of the patient-derived xenografts tested were sensitive to treatment with ENMD 2076 as measured by tumor growth inhibition. CONCLUSIONS ENMD-2076 showed robust antitumor activity against cell line and patient-derived xenograft models of CRC that is detectable by functional imaging, supporting clinical investigation of this agent in CRC.
Collapse
Affiliation(s)
- John J Tentler
- Division of Medical Oncology, University of Colorado Anschutz Medical Center, Aurora, Colorado
| | - Erica L Bradshaw-Pierce
- Departments of Anesthesiology and Radiology, University of Colorado Anschutz Medical Center, Aurora, Colorado
| | - Natalie J Serkova
- Departments of Anesthesiology and Radiology, University of Colorado Anschutz Medical Center, Aurora, Colorado
| | - Kendra M Hasebroock
- Departments of Anesthesiology and Radiology, University of Colorado Anschutz Medical Center, Aurora, Colorado
| | - Todd M Pitts
- Division of Medical Oncology, University of Colorado Anschutz Medical Center, Aurora, Colorado
| | - Jennifer R Diamond
- Division of Medical Oncology, University of Colorado Anschutz Medical Center, Aurora, Colorado
| | | | | | - S Gail Eckhardt
- Division of Medical Oncology, University of Colorado Anschutz Medical Center, Aurora, Colorado
| |
Collapse
|