1
|
Ding H, Chen XC, Wan L, Zhang YY, Rui XH, He T, Liu J, Shang ZB. Klebsiella pneumoniae alters zebrafish circadian rhythm via inflammatory pathways and is dependent on light cues. Heliyon 2024; 10:e30829. [PMID: 38770281 PMCID: PMC11103479 DOI: 10.1016/j.heliyon.2024.e30829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 05/02/2024] [Accepted: 05/06/2024] [Indexed: 05/22/2024] Open
Abstract
Klebsiella pneumoniae is an opportunistic pathogen causing severe infections. The circadian rhythm is the internal rhythm mechanism of an organism and plays an important role in coping with changes in the 24-h circadian rhythm. Disruption of the circadian rhythm can lead to immune, behavioral, mental, and other related disorders. Whether K. pneumoniae can disrupt the circadian rhythm after infection remains unclear. Here, we examined the effects of K. pneumoniae NTUH-K2044 infection on biological rhythm and inflammation in zebrafish using behavioral assays, quantitative real-time reverse transcription PCR, neutrophil and macrophage transgenic fish, and drug treatment. The results showed that K. pneumoniae infection decreased the motor activity of zebrafish and reduced the circadian rhythm amplitude, phase, and period. The expression of core circadian rhythm-associated genes increased under light-dark conditions, whereas they were downregulated under continuous darkness. Analysis of Klebsiella pneumoniae-mediated inflammation using Tg(mpx:EGFP) and Tg(mpeg:EGFP) transgenic zebrafish, expressing fluorescent neutrophils and macrophages, respectively, showed increased induction of inflammatory cells, upregulated expression of inflammatory factor genes, and stronger inflammatory responses under light-dark conditions. These effects were reversed by the anti-inflammatory drug G6PDi-1, and the expression of clock genes following K. pneumoniae treatment was disrupted. We determined the relationship among K. pneumoniae, inflammation, and the circadian rhythm, providing a theoretical reference for studying circadian rhythm disorders caused by inflammation.
Collapse
Affiliation(s)
- Hui Ding
- Department of Laboratory Medicine, Affiliated Wuxi Fifth Hospital of Jiangnan University, Wuxi, 214005, China
| | - Xiao-chun Chen
- Department of Laboratory Medicine, Taizhou Second People's Hospital, Taizhou, 225411, China
| | - Lin Wan
- Department of Laboratory Medicine, Jiangnan University Medical Center, Wuxi, 214000, China
| | - Ying-ying Zhang
- Department of Laboratory Medicine, Affiliated Wuxi Fifth Hospital of Jiangnan University, Wuxi, 214005, China
| | - Xiao-hong Rui
- Department of Laboratory Medicine, Affiliated Wuxi Fifth Hospital of Jiangnan University, Wuxi, 214005, China
| | - Tian He
- Department of Laboratory Medicine, Affiliated Wuxi Fifth Hospital of Jiangnan University, Wuxi, 214005, China
| | - Jun Liu
- Department of Laboratory Medicine, Affiliated Wuxi Fifth Hospital of Jiangnan University, Wuxi, 214005, China
| | - Zhong-bo Shang
- Department of Laboratory Medicine, Wuxi Huishan District People's Hospital, Wuxi, 214000, China
| |
Collapse
|
2
|
Habtewold T, Tapanelli S, Masters EKG, Windbichler N, Christophides GK. The circadian clock modulates Anopheles gambiae infection with Plasmodium falciparum. PLoS One 2022; 17:e0278484. [PMID: 36454885 PMCID: PMC9714873 DOI: 10.1371/journal.pone.0278484] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 11/16/2022] [Indexed: 12/03/2022] Open
Abstract
Key behaviours, physiologies and gene expressions in Anopheles mosquitoes impact the transmission of Plasmodium. Such mosquito factors are rhythmic to closely follow diel rhythms. Here, we set to explore the impact of the mosquito circadian rhythm on the tripartite interaction between the vector, the parasite and the midgut microbiota, and investigate how this may affect the parasite infection outcomes. We assess Plasmodium falciparum infection prevalence and intensity, as a proxy for gametocyte infectivity, in Anopheles gambiae mosquitoes that received a gametocyte-containing bloodfeed and measure the abundance of the midgut microbiota at different times of the mosquito rearing light-dark cycle. Gametocyte infectivity is also compared in mosquitoes reared and maintained under a reversed light-dark regime. The effect of the circadian clock on the infection outcome is also investigated through silencing of the CLOCK gene that is central in the regulation of animal circadian rhythms. The results reveal that the A. gambiae circadian cycle plays a key role in the intensity of infection of P. falciparum gametocytes. We show that parasite gametocytes are more infectious during the night-time, where standard membrane feeding assays (SMFAs) at different time points in the mosquito natural circadian rhythm demonstrate that gametocytes are more infectious when ingested at midnight than midday. When mosquitoes were cultured under a reversed light/dark regime, disrupting their natural physiological homeostasis, and infected with P. falciparum at evening hours, the infection intensity and prevalence were significantly decreased. Similar results were obtained in mosquitoes reared under the standard light/dark regime upon silencing of CLOCK, a key regulator of the circadian rhythm, highlighting the importance of the circadian rhythm for the mosquito vectorial capacity. At that time, the mosquito midgut microbiota load is significantly reduced, while the expression of lysozyme C-1 (LYSC-1) is elevated, which is involved in both the immune response and microbiota digestion. We conclude that the tripartite interactions between the mosquito vector, the malaria parasite and the mosquito gut microbiota are finely tuned to support and maintain malaria transmission. Our data add to the knowledge framework required for designing appropriate and biologically relevant SMFA protocols.
Collapse
Affiliation(s)
- Tibebu Habtewold
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Sofia Tapanelli
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Ellen K. G. Masters
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Nikolai Windbichler
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | | |
Collapse
|
3
|
Immunity, Infection, and the Zebrafish Clock. Infect Immun 2022; 90:e0058821. [PMID: 35972269 PMCID: PMC9476956 DOI: 10.1128/iai.00588-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Circadian clocks are universally used to coordinate biological processes with the Earth's 24-h solar day and are critical for the health and environmental success of an organism. Circadian rhythms in eukaryotes are driven by a cell-intrinsic transcription-translation feedback loop that controls daily oscillations in gene expression which regulate diverse physiological functions. Substantial evidence now exists demonstrating that immune activation and inflammatory responses during infection are under circadian control, however, the cellular mechanisms responsible for this are not well understood. The zebrafish (Danio rerio) is a powerful model organism to study vertebrate circadian biology and immune function. Zebrafish contain homologs of mammalian circadian clock genes which, to our current knowledge, function similarly to impart timekeeping ability. Consistent with studies in mammalian models, several studies in fish have now demonstrated a bidirectional relationship between the circadian clock and inflammation: the circadian clock regulates immune activity, and inflammation can alter circadian rhythms. This review summarizes our current understanding of the molecular mechanisms of the zebrafish clock and the bi-directional relationship between the circadian clock and inflammation in fish.
Collapse
|
4
|
Guidi C, Esteban MÁ, Sánchez-Vázquez FJ, Vera LM. Administration time-dependent effects of poly (I:C) on antioxidant and immune responses along the diurnal time scale in zebrafish. Chronobiol Int 2022; 39:1256-1267. [PMID: 35786237 DOI: 10.1080/07420528.2022.2093735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The circadian clock of vertebrates regulates many biological processes, including the immune system. This paper investigated whether responsiveness to poly (I:C), a synthetic analog of double-stranded RNA used as an immunostimulant, exhibits day/night differences in zebrafish. Fish were intraperitoneally (IP) injected with either phosphate-buffered saline (PBS) or poly (I:C) at two different time points: "Zeitgeber Time" (ZT) 4 (day) and ZT16 (night). Then, 6 h later, fish were euthanized, and tissue samples (skin, liver and kidney) were collected. A control group (intact fish) was also sampled at the same time points. The effect of poly (I:C) on the expression of antioxidant and immune genes was time-of-day-dependent, and the response was stronger following poly (I:C) administration in the day than at night. Time-dependent differences were observed for some genes in the PBS and control groups. However, these differences were tissue-specific. In liver, almost all the genes were affected by time of day. In kidney, poly (I:C) affected the expression of all the gene markers regardless of administration time. These findings highlight the importance of considering the time to administer poly (I:C) when evaluating the fish immune response.
Collapse
Affiliation(s)
- Costanza Guidi
- Department of Physiology, Faculty of Biology, Regional Campus of International Excellence "Campus Mare Nostrum," University of Murcia, Murcia, Spain
| | - M Ángeles Esteban
- Department of Cell Biology and Histology, Faculty of Biology, Regional Campus of International Excellence "Campus Mare Nostrum," University of Murcia, Murcia, Spain
| | - Francisco J Sánchez-Vázquez
- Department of Physiology, Faculty of Biology, Regional Campus of International Excellence "Campus Mare Nostrum," University of Murcia, Murcia, Spain
| | - Luisa M Vera
- Department of Physiology, Faculty of Biology, Regional Campus of International Excellence "Campus Mare Nostrum," University of Murcia, Murcia, Spain
| |
Collapse
|
5
|
Levraud JP, Rawls JF, Clatworthy AE. Using zebrafish to understand reciprocal interactions between the nervous and immune systems and the microbial world. J Neuroinflammation 2022; 19:170. [PMID: 35765004 PMCID: PMC9238045 DOI: 10.1186/s12974-022-02506-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 06/01/2022] [Indexed: 11/10/2022] Open
Abstract
Animals rely heavily on their nervous and immune systems to perceive and survive within their environment. Despite the traditional view of the brain as an immunologically privileged organ, these two systems interact with major consequences. Furthermore, microorganisms within their environment are major sources of stimuli and can establish relationships with animal hosts that range from pathogenic to mutualistic. Research from a variety of human and experimental animal systems are revealing that reciprocal interactions between microbiota and the nervous and immune systems contribute significantly to normal development, homeostasis, and disease. The zebrafish has emerged as an outstanding model within which to interrogate these interactions due to facile genetic and microbial manipulation and optical transparency facilitating in vivo imaging. This review summarizes recent studies that have used the zebrafish for analysis of bidirectional control between the immune and nervous systems, the nervous system and the microbiota, and the microbiota and immune system in zebrafish during development that promotes homeostasis between these systems. We also describe how the zebrafish have contributed to our understanding of the interconnections between these systems during infection in fish and how perturbations may result in pathology.
Collapse
Affiliation(s)
- Jean-Pierre Levraud
- Université Paris-Saclay, CNRS, Institut Pasteur, Université Paris-Cité, Institut des Neurosciences Paris-Saclay, 91400, Saclay, France.
| | - John F. Rawls
- grid.26009.3d0000 0004 1936 7961Department of Molecular Genetics and Microbiology, Duke Microbiome Center, Duke University School of Medicine, 213 Research Drive, Durham, NC 27710 USA
| | - Anne E. Clatworthy
- grid.66859.340000 0004 0546 1623Broad Institute of MIT and Harvard, 415 Main Street, Cambridge, MA 02142 USA ,grid.32224.350000 0004 0386 9924Department of Molecular Biology and Center for Computational and Integrative Biology, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114 USA
| |
Collapse
|
6
|
De Maria M, Kroll KJ, Yu F, Nouri MZ, Silva-Sanchez C, Perez JG, Moraga Amador DA, Zhang Y, Walsh MT, Denslow ND. Endocrine, immune and renal toxicity in male largemouth bass after chronic exposure to glyphosate and Rodeo®. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2022; 246:106142. [PMID: 35306440 PMCID: PMC9007883 DOI: 10.1016/j.aquatox.2022.106142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 03/10/2022] [Accepted: 03/11/2022] [Indexed: 05/03/2023]
Abstract
Glyphosate is the most used herbicide worldwide, with no historical comparison. It is used for genetically modified crops, and particularly in Florida, it is used as a sugar cane ripener. An aquatic formulation (Rodeo®) is used to treat aquatic weeds in waterbodies and drainage canals. Because of its extended use, glyphosate can run off or be sprayed directly into waterbodies, and chronically expose aquatic wildlife. Exposure in animal models has been associated with kidney and liver damage and glyphosate has been suggested as an endocrine disruptor. We exposed adult male largemouth bass for 21 days to two doses of glyphosate and Rodeo® (chemically equivalent concentration of glyphosate) at 0.5 mg L-1 and 10 mg L-1 and to a clean water control (n=4 fish/tank in quadruplicate). Concentrations during the experiment were corroborated with UHPLC-MS/MS. Total RNA was isolated from the trunk kidney and head kidney. RNA-seq was performed for the high doses compared to controls. Transcripts were analyzed with fish and mammalian pathway analyses software. Transcripts mapped to Zebrafish metabolic pathways using PaintOmics showed steroid hormone biosynthesis in the trunk kidney as the most significantly enriched pathway. Steroid hormones were measured in plasma by UHPLC-MS/MS. Total androgens were significantly reduced at 0.5 mg L-1 of glyphosate and at equivalent concentrations in Rodeo® compared to controls. 11-ketotestosterone and estrone concentrations were significantly reduced in all doses. A gene involved in the conversion of testosterone to 11-ketotestosterone was down-regulated by glyphosate. Using the mammalian pathway analysis algorithm, cellular processes associated with T-cell activation/development and intracellular pH were significantly enriched in the trunk kidney by glyphosate and Rodeo® exposure. Endocrine disruption was corroborated at the hormone and gene expression levels. Rodeo® and glyphosate share gene expression pathways, however, Rodeo® had more pronounced effects in largemouth bass.
Collapse
Affiliation(s)
- Maite De Maria
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, United States.
| | - Kevin J Kroll
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, United States
| | - Fahong Yu
- Interdisciplinary Center for Biotechnology Research (ICBR), University of Florida, Gainesville, FL 32611, United States
| | - Mohammad-Zaman Nouri
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, United States
| | - Cecilia Silva-Sanchez
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, United States
| | - Juan Guillermo Perez
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, United States
| | - David A Moraga Amador
- Interdisciplinary Center for Biotechnology Research (ICBR), University of Florida, Gainesville, FL 32611, United States
| | - Yanping Zhang
- Interdisciplinary Center for Biotechnology Research (ICBR), University of Florida, Gainesville, FL 32611, United States
| | - Mike T Walsh
- Aquatic Animal Health Program, College of Veterinary Medicine, University of Florida, PO Box 100136, Gainesville, FL 32610, United States
| | - Nancy D Denslow
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, United States; Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32610, United States.
| |
Collapse
|
7
|
Mech AM, Merteroglu M, Sealy IM, Teh MT, White RJ, Havelange W, Brennan CH, Busch-Nentwich EM. Behavioral and Gene Regulatory Responses to Developmental Drug Exposures in Zebrafish. Front Psychiatry 2022; 12:795175. [PMID: 35082702 PMCID: PMC8785235 DOI: 10.3389/fpsyt.2021.795175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 11/29/2021] [Indexed: 01/22/2023] Open
Abstract
Developmental consequences of prenatal drug exposure have been reported in many human cohorts and animal studies. The long-lasting impact on the offspring-including motor and cognitive impairments, cranial and cardiac anomalies and increased prevalence of ADHD-is a socioeconomic burden worldwide. Identifying the molecular changes leading to developmental consequences could help ameliorate the deficits and limit the impact. In this study, we have used zebrafish, a well-established behavioral and genetic model with conserved drug response and reward pathways, to identify changes in behavior and cellular pathways in response to developmental exposure to amphetamine, nicotine or oxycodone. In the presence of the drug, exposed animals showed altered behavior, consistent with effects seen in mammalian systems, including impaired locomotion and altered habituation to acoustic startle. Differences in responses seen following acute and chronic exposure suggest adaptation to the presence of the drug. Transcriptomic analysis of exposed larvae revealed differential expression of numerous genes and alterations in many pathways, including those related to cell death, immunity and circadian rhythm regulation. Differential expression of circadian rhythm genes did not correlate with behavioral changes in the larvae, however, two of the circadian genes, arntl2 and per2, were also differentially expressed at later stages of development, suggesting a long-lasting impact of developmental exposures on circadian gene expression. The immediate-early genes, egr1, egr4, fosab, and junbb, which are associated with synaptic plasticity, were downregulated by all three drugs and in situ hybridization showed that the expression for all four genes was reduced across all neuroanatomical regions, including brain regions implicated in reward processing, addiction and other psychiatric conditions. We anticipate that these early changes in gene expression in response to drug exposure are likely to contribute to the consequences of prenatal exposure and their discovery might pave the way to therapeutic intervention to ameliorate the long-lasting deficits.
Collapse
Affiliation(s)
- Aleksandra M. Mech
- School of Biological and Behavioural Sciences, Faculty of Science and Engineering, Queen Mary University of London, London, United Kingdom
| | - Munise Merteroglu
- Department of Medicine, Cambridge Institute of Therapeutic Immunology and Infectious Disease, University of Cambridge, Cambridge, United Kingdom
| | - Ian M. Sealy
- Department of Medicine, Cambridge Institute of Therapeutic Immunology and Infectious Disease, University of Cambridge, Cambridge, United Kingdom
| | - Muy-Teck Teh
- Centre for Oral Immunobiology and Regenerative Medicine, Institute of Dentistry, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, England, United Kingdom
| | - Richard J. White
- Department of Medicine, Cambridge Institute of Therapeutic Immunology and Infectious Disease, University of Cambridge, Cambridge, United Kingdom
| | - William Havelange
- School of Biological and Behavioural Sciences, Faculty of Science and Engineering, Queen Mary University of London, London, United Kingdom
| | - Caroline H. Brennan
- School of Biological and Behavioural Sciences, Faculty of Science and Engineering, Queen Mary University of London, London, United Kingdom
| | - Elisabeth M. Busch-Nentwich
- School of Biological and Behavioural Sciences, Faculty of Science and Engineering, Queen Mary University of London, London, United Kingdom
- Department of Medicine, Cambridge Institute of Therapeutic Immunology and Infectious Disease, University of Cambridge, Cambridge, United Kingdom
| |
Collapse
|
8
|
Ellison AR, Uren Webster TM, Rodriguez-Barreto D, de Leaniz CG, Consuegra S, Orozco-terWengel P, Cable J. Comparative transcriptomics reveal conserved impacts of rearing density on immune response of two important aquaculture species. FISH & SHELLFISH IMMUNOLOGY 2020; 104:192-201. [PMID: 32534231 DOI: 10.1016/j.fsi.2020.05.043] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 05/13/2020] [Accepted: 05/15/2020] [Indexed: 06/11/2023]
Abstract
Infectious diseases represent an important barrier to sustainable aquaculture development. Rearing density can substantially impact fish productivity, health and welfare in aquaculture, including growth rates, behaviour and, crucially, immune activity. Given the current emphasis on aquaculture diversification, stress-related indicators broadly applicable across species are needed. Utilising an interspecific comparative transcriptomic (RNAseq) approach, we compared gill gene expression responses of Atlantic salmon (Salmo salar) and Nile tilapia (Oreochromis niloticus) to rearing density and Saprolegnia parasitica infection. Salmon reared at high-density showed increased expression of stress-related markers (e.g. c-fos and hsp70), and downregulation of innate immune genes. Upon pathogen challenge, only salmon reared at low density exhibited increased expression of inflammatory interleukins and lymphocyte-related genes. Tilapia immunity, in contrast, was impaired at low-density. Using overlapping gene ontology enrichment and gene ortholog analyses, we found that density-related stress similarly impacted salmon and tilapia in key immune pathways, altering the expression of genes vital to inflammatory and Th17 responses to pathogen challenge. Given the challenges posed by ectoparasites and gill diseases in fish farms, this study underscores the importance of optimal rearing densities for immunocompetence, particularly for mucosal immunity. Our comparative transcriptomics analyses identified density stress impacted immune markers common across different fish taxa, providing key molecular targets with potential for monitoring and enhancing aquaculture resilience in a wide range of farmed species.
Collapse
Affiliation(s)
- Amy R Ellison
- School of Biosciences, Cardiff University, Cardiff, CF10 3AX, UK.
| | | | | | | | - Sofia Consuegra
- Biosciences Department, Swansea University, Swansea, SA2 8PP, UK.
| | | | - Jo Cable
- School of Biosciences, Cardiff University, Cardiff, CF10 3AX, UK.
| |
Collapse
|
9
|
Britto DD, Wyroba B, Chen W, Lockwood RA, Tran KB, Shepherd PR, Hall CJ, Crosier KE, Crosier PS, Astin JW. Macrophages enhance Vegfa-driven angiogenesis in an embryonic zebrafish tumour xenograft model. Dis Model Mech 2018; 11:dmm.035998. [PMID: 30396905 PMCID: PMC6307908 DOI: 10.1242/dmm.035998] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 10/25/2018] [Indexed: 12/11/2022] Open
Abstract
Tumour angiogenesis has long been a focus of anti-cancer therapy; however, anti-angiogenic cancer treatment strategies have had limited clinical success. Tumour-associated myeloid cells are believed to play a role in the resistance of cancer towards anti-angiogenesis therapy, but the mechanisms by which they do this are unclear. An embryonic zebrafish xenograft model has been developed to investigate the mechanisms of tumour angiogenesis and as an assay to screen anti-angiogenic compounds. In this study, we used cell ablation techniques to remove either macrophages or neutrophils and assessed their contribution towards zebrafish xenograft angiogenesis by quantitating levels of graft vascularisation. The ablation of macrophages, but not neutrophils, caused a strong reduction in tumour xenograft vascularisation and time-lapse imaging demonstrated that tumour xenograft macrophages directly associated with the migrating tip of developing tumour blood vessels. Finally, we found that, although macrophages are required for vascularisation in xenografts that either secrete VEGFA or overexpress zebrafish vegfaa, they are not required for the vascularisation of grafts with low levels of VEGFA, suggesting that zebrafish macrophages can enhance Vegfa-driven tumour angiogenesis. The importance of macrophages to this angiogenic response suggests that this model could be used to further investigate the interplay between myeloid cells and tumour vascularisation. Summary: Zebrafish embryonic macrophages associate with the distal tips of tumour xenograft blood vessels and are required for Vegfa-driven angiogenesis.
Collapse
Affiliation(s)
- Denver D Britto
- Department of Molecular Medicine and Pathology, School of Medical Sciences, University of Auckland, Auckland 1023, New Zealand
| | - Barbara Wyroba
- Department of Cell Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków 30-387, Poland
| | - Wenxuan Chen
- Department of Molecular Medicine and Pathology, School of Medical Sciences, University of Auckland, Auckland 1023, New Zealand
| | - Rhoswen A Lockwood
- Department of Molecular Medicine and Pathology, School of Medical Sciences, University of Auckland, Auckland 1023, New Zealand
| | - Khanh B Tran
- Department of Molecular Medicine and Pathology, School of Medical Sciences, University of Auckland, Auckland 1023, New Zealand
| | - Peter R Shepherd
- Department of Molecular Medicine and Pathology, School of Medical Sciences, University of Auckland, Auckland 1023, New Zealand
| | - Christopher J Hall
- Department of Molecular Medicine and Pathology, School of Medical Sciences, University of Auckland, Auckland 1023, New Zealand
| | - Kathryn E Crosier
- Department of Molecular Medicine and Pathology, School of Medical Sciences, University of Auckland, Auckland 1023, New Zealand
| | - Philip S Crosier
- Department of Molecular Medicine and Pathology, School of Medical Sciences, University of Auckland, Auckland 1023, New Zealand
| | - Jonathan W Astin
- Department of Molecular Medicine and Pathology, School of Medical Sciences, University of Auckland, Auckland 1023, New Zealand
| |
Collapse
|