Anthony Gordon Beckhouse
Griffith University
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Publication
Featured researches published by Anthony Gordon Beckhouse.
Journal of Immunology | 2008
Christine A. Wells; Judith Salvage-Jones; Xin Li; Kelly J Hitchens; Suzanne Butcher; Rachael Z. Murray; Anthony Gordon Beckhouse; Yu-Lan-Sandra Lo; Silvia Manzanero; Christian James Cobbold; Kate Schroder; Bo Ma; Sally Orr; Lauren Stewart; Daniel Lebus; Peter Sobieszczuk; David A. Hume; Jennifer L. Stow; Helen Blanchard; R. B. Ashman
The recognition of carbohydrate moieties by cells of the innate immune system is emerging as an essential element in antifungal immunity, but despite the number and diversity of lectins expressed by innate immune cells, few carbohydrate receptors have been characterized. Mincle, a C-type lectin, is expressed predominantly on macrophages, and is here shown to play a role in macrophage responses to the yeast Candida albicans. After exposure to the yeast in vitro, Mincle localized to the phagocytic cup, but it was not essential for phagocytosis. In the absence of Mincle, production of TNF-α by macrophages was reduced, both in vivo and in vitro. In addition, mice lacking Mincle showed a significantly increased susceptibility to systemic candidiasis. Thus, Mincle plays a novel and nonredundant role in the induction of inflammatory signaling in response to C. albicans infection.
Disease Models & Mechanisms | 2010
Nicholas Matigian; Greger Abrahamsen; Ratneswary Sutharsan; Anthony L. Cook; Alejandra Mariel Vitale; Amanda Nouwens; Bernadette Bellette; Jiyuan An; Matthew J. Anderson; Anthony Gordon Beckhouse; Maikel Bennebroek; Rowena Cecil; Alistair Morgan Chalk; Julie Cochrane; Yongjun Fan; François Féron; Richard D. McCurdy; John J. McGrath; Wayne Murrell; Chris Perry; Jyothy Raju; Sugandha Ravishankar; Peter A. Silburn; Greg T. Sutherland; Stephen M. Mahler; George D. Mellick; Stephen A. Wood; Carolyn M. Sue; Christine A. Wells; Alan Mackay-Sim
SUMMARY There is a pressing need for patient-derived cell models of brain diseases that are relevant and robust enough to produce the large quantities of cells required for molecular and functional analyses. We describe here a new cell model based on patient-derived cells from the human olfactory mucosa, the organ of smell, which regenerates throughout life from neural stem cells. Olfactory mucosa biopsies were obtained from healthy controls and patients with either schizophrenia, a neurodevelopmental psychiatric disorder, or Parkinson’s disease, a neurodegenerative disease. Biopsies were dissociated and grown as neurospheres in defined medium. Neurosphere-derived cell lines were grown in serum-containing medium as adherent monolayers and stored frozen. By comparing 42 patient and control cell lines we demonstrated significant disease-specific alterations in gene expression, protein expression and cell function, including dysregulated neurodevelopmental pathways in schizophrenia and dysregulated mitochondrial function, oxidative stress and xenobiotic metabolism in Parkinson’s disease. The study has identified new candidate genes and cell pathways for future investigation. Fibroblasts from schizophrenia patients did not show these differences. Olfactory neurosphere-derived cells have many advantages over embryonic stem cells and induced pluripotent stem cells as models for brain diseases. They do not require genetic reprogramming and they can be obtained from adults with complex genetic diseases. They will be useful for understanding disease aetiology, for diagnostics and for drug discovery.
American Journal of Pathology | 2011
M. A. Alikhan; Christina Victoria Jones; Timothy M Williams; Anthony Gordon Beckhouse; Anne L. Fletcher; Michelle M. Kett; Samy Sakkal; Chrishan S. Samuel; Robert G. Ramsay; James A. Deane; Christine A. Wells; Melissa H. Little; David A. Hume; Sharon D. Ricardo
Colony-stimulating factor (CSF)-1 controls the survival, proliferation, and differentiation of macrophages, which are recognized as scavengers and agents of the innate and the acquired immune systems. Because of their plasticity, macrophages are endowed with many other essential roles during development and tissue homeostasis. We present evidence that CSF-1 plays an important trophic role in postnatal organ growth and kidney repair. Notably, the injection of CSF-1 postnatally enhanced kidney weight and volume and was associated with increased numbers of tissue macrophages. Moreover, CSF-1 promotes postnatal renal repair in mice after ischemia-reperfusion injury by recruiting and influencing macrophages toward a reparative state. CSF-1 treatment rapidly accelerated renal repair with tubular epithelial cell replacement, attenuation of interstitial fibrosis, and functional recovery. Analysis of macrophages from CSF-1-treated kidneys showed increased expression of insulin-like growth factor-1 and anti-inflammatory genes that are known CSF-1 targets. Taken together, these data suggest that CSF-1 is important in kidney growth and the promotion of endogenous repair and resolution of inflammatory injury.
Applied and Environmental Microbiology | 2003
Vincent J. Higgins; Anthony Gordon Beckhouse; Anthony D. Oliver; Peter J. Rogers; Ian W. Dawes
ABSTRACT Genome-wide expression analysis of an industrial strain of Saccharomyces cerevisiae during the initial stages of an industrial lager fermentation identified a strong response from genes involved in the biosynthesis of ergosterol and oxidative stress protection. The induction of the ERG genes was confirmed by Northern analysis and was found to be complemented by a rapid accumulation of ergosterol over the initial 6-h fermentation period. From a test of the metabolic activity of deletion mutants in the ergosterol biosynthesis pathway, it was found that ergosterol is an important factor in restoring the fermentative capacity of the cell after storage. Additionally, similar ERG10 and TRR1 gene expression patterns over the initial 24-h fermentation period highlighted a possible interaction between ergosterol biosynthesis and the oxidative stress response. Further analysis showed that erg mutants producing altered sterols were highly sensitive to oxidative stress-generating compounds. Here we show that genome-wide expression analysis can be used in the commercial environment and was successful in identifying environmental conditions that are important in industrial yeast fermentation.
Glycobiology | 2008
Andrea Bugarcic; Kelly J Hitchens; Anthony Gordon Beckhouse; Christine A. Wells; R. B. Ashman; Helen Blanchard
Candida albicans is a causative agent in mycoses of the skin, oral cavity, and gastrointestinal tract. Identification of receptors, and their respective ligands, that are engaged by immune cells when in contact with C. albicans is crucial for understanding inflammatory responses leading to invasive candidiasis. Mincle is a recently identified macrophage-expressed receptor that is important for host responses to C. albicans. The carbohydrate-recognition domain of human and mouse Mincle were expressed, purified under denaturing conditions, and successfully refolded. In addition to oligomers, there are isolatable monomeric and dimeric forms of the protein that occur under two different buffer solutions. The human and mouse homologues bound yeast extract, and the isolated dimeric and monomeric species also demonstrated the recognition of whole C. albicans yeast cells. The data are indicative of several functional states mediating the interaction of Mincle and yeast at the surface of the macrophage.
Biochimica et Biophysica Acta | 2000
Chris M. Grant; Sandra Luikenhuis; Anthony Gordon Beckhouse; Malin Soderbergh; Ian W. Dawes
Glutaredoxins are small heat-stable proteins that are active as glutathione-dependent oxidoreductases and are encoded by two genes, designated GRX1 and GRX2, in the yeast Saccharomyces cerevisiae. We report here that the expression of both genes is induced in response to various stress conditions including oxidative, osmotic, and heat stress and in response to stationary phase growth and growth on non-fermentable carbon sources. Furthermore, both genes are activated by the high-osmolarity glycerol pathway and negatively regulated by the Ras-protein kinase A pathway via stress-responsive STRE elements. GRX1 contains a single STRE element and is induced to significantly higher levels compared to GRX2 following heat and osmotic shock. GRX2 contains two STRE elements, and is rapidly induced in response to reactive oxygen species and upon entry into stationary phase growth. Thus, these data support the idea that the two glutaredoxin isoforms in yeast play distinct roles during normal cellular growth and in response to stress conditions.
Immunology and Cell Biology | 2012
Dipti Vijayan; Kristen J. Radford; Anthony Gordon Beckhouse; R. B. Ashman; Christine A. Wells
The distribution and function of the C‐type lectin Mincle has not previously been investigated in human cells, although mouse models have demonstrated a non‐redundant role for Mincle in the host response to fungal infections. This study identified an unusual pattern of reciprocal expression of Mincle on peripheral blood monocytes or neutrophils isolated from the same donor. Expression on monocytes was inversely correlated with phagocytosis and yeast killing, but was necessary for the induction of inflammatory cytokines in response to ex vivo Candida challenge. In contrast, Mincle expression on neutrophils was associated with phagocytic and candidacidal potential of those cells. Candida challenge upregulated Mincle expression but only in Mincle+ cells. These data highlight species‐specific differences between the regulation of Mincle expression in mouse and man. Reciprocal expression of Mincle modified the candidacidal potential of monocytes or neutrophils, suggesting it may also polarize the type of host response to fungal infection.
Mammalian Genome | 2009
Yu-Lan Sandra Lo; Anthony Gordon Beckhouse; Sharon Louise Boulus; Christine A. Wells
The Toll-interacting protein TOLLIP is an ubiquitin-binding protein that interacts with several components of the Toll-like receptor signaling cascade. The canonical protein consists of three annotated domains: an N-terminal TBD-loop-coil domain that mediates protein-protein interactions, a C2 domain that targets TOLLIP to the endosome, and a CUE domain at the C-terminus that binds monoubiquitin. TOLLIP has been described primarily in trafficking of the interleukin-1 receptor (IL1R) and turnover of the interleukin-1 receptor-associated kinase (IRAK), so it is an essential regulator of inflammatory signaling. Here we describe the expression of numerous alternate transcripts from mouse and human TOLLIP, which are predicted to generate at least five variant proteins between the two species. Most of the variant proteins are predicted to have altered N-terminal domains, altered TBD-loop-coil domains, or a truncated C2 domain. A mouse-specific variant arises from an alternate termination exon, and the resulting protein lacks the CUE domain. Two transcripts arising from alternate initiating exons are highly conserved between mouse and human but exhibit different patterns of expression. The consequent protein isoforms retain (TOLLIP.A) or lack (TOLLIP.D) the protein-binding TBD, so are predicted to traffic monoubiquitinated proteins to alternate protein complexes within the endosomal compartment. In summary, the widespread and inducible expression of Tollip isoforms predicts diversification of its function in rodent and human immune systems. Alternate splicing of critical signaling molecules such as Tollip may provide one mechanism behind the broad repertoire of responses generated by cells of the innate immune system in response to infection.
Fems Yeast Research | 2008
Anthony Gordon Beckhouse; Chris M. Grant; Peter J. Rogers; Ian W. Dawes; Vincent J. Higgins
The molecular mechanisms involved in the ability of cells to adapt and respond to differing oxygen tensions are of great interest to the pharmaceutical, medical and fermentation industries. The transcriptional profiles reported in previous studies of cells grown under anaerobic, aerobic and dynamic growth conditions have shown significantly altered responses including induction of genes regulated by the oxidative stress transcription factor Yap1p when oxygen was present. The present study investigated the phenotypic changes that occur in cells when shifted from anaerobic to aerobic growth conditions and it was found through mutant analyses that the elevated activity of Yap1p during the shift was mediated by the phospholipid hydroperoxide-sensing protein encoded by GPX3. Cell viability and growth rate were unaffected even though anaerobically grown cells were found to be hypersensitive to low doses of the oxidative stress-inducing compound hydrogen peroxide (H(2)O(2)). Adaptation to H(2)O(2) treatment was demonstrated to occur when anaerobically grown wild-type cells were aerated for a short time that was reliant on the Yap1p and Skn7p transcription factors.
Journal of Biological Chemistry | 2009
Bonny M. Tsoi; Anthony Gordon Beckhouse; Cristy L. Gelling; Mark J. Raftery; Joyce Chiu; Abraham Tsoi; Lars Lauterbach; Peter J. Rogers; Vincent J. Higgins; Ian W. Dawes
The transcriptional activator Gcn4p is considered the master regulator of amino acid metabolism in Saccharomyces cerevisiae and is required for the transcriptional response to amino acid starvation. Here it is shown that Gcn4p plays a previously undescribed role in regulating adaptation to anaerobic growth. A gcn4 mutant exhibited a highly extended lag phase after a shift to anaerobiosis that was the result of l-serine depletion. In addition, the one-carbon metabolism and purine biosynthesis transcriptional regulator Bas1p were strictly required for anaerobic growth on minimal medium, and this was similarly due to l-serine limitation in bas1 mutants. The induction of one-carbon metabolism during anaerobiosis is needed to increase the supply of l-serine from the glycine and threonine pathways. Using a number of experimental approaches, we demonstrate that these transcription regulators play vital roles in regulating l-serine biosynthesis in the face of increased demand during adaptation to anaerobiosis. This increased l-serine requirement is most likely due to anaerobic remodeling of the cell wall, involving de novo synthesis of a large number of very serine-rich mannoproteins and an increase in the total serine content of the cell wall. During anaerobic starvation for l-serine, this essential amino acid is preferentially directed to the cell wall, indicating the existence of a regulatory mechanism to balance competing cellular demands.