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Roudebush WE, Straub RJ, Massey JB, Kort HI. Temporal Production of Platelet-Activating Factor by Brewer's Yeast. JOURNAL OF THE AMERICAN SOCIETY OF BREWING CHEMISTS 2018. [DOI: 10.1094/asbcj-64-0135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Tsoupras AB, Demopoulos CA, Pappas KM. Platelet‐activating factor detection, metabolism, and inhibitors in the ethanologenic bacterium
Zymomonas mobilis. EUR J LIPID SCI TECH 2011. [DOI: 10.1002/ejlt.201000489] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Alexandros B. Tsoupras
- Laboratory of Biochemistry, Faculty of Chemistry, National & Kapodistrian University of Athens, Panepistimioupolis, Zografou, Athens, Greece
- Center of Cardiovascular Sciences, Albany Medical Center/College, Albany, NY, USA
| | - Constantinos A. Demopoulos
- Laboratory of Biochemistry, Faculty of Chemistry, National & Kapodistrian University of Athens, Panepistimioupolis, Zografou, Athens, Greece
| | - Katherine M. Pappas
- Faculty of Biology, Department of Genetics and Biotechnology, National & Kapodistrian University of Athens, Panepistimioupolis, Zografou, Athens, Greece
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Kennedy MA, Kabbani N, Lambert JP, Swayne LA, Ahmed F, Figeys D, Bennett SAL, Bryan J, Baetz K. Srf1 is a novel regulator of phospholipase D activity and is essential to buffer the toxic effects of C16:0 platelet activating factor. PLoS Genet 2011; 7:e1001299. [PMID: 21347278 PMCID: PMC3037409 DOI: 10.1371/journal.pgen.1001299] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2010] [Accepted: 01/07/2011] [Indexed: 01/06/2023] Open
Abstract
During Alzheimer's Disease, sustained exposure to amyloid-β42 oligomers perturbs metabolism of ether-linked glycerophospholipids defined by a saturated 16 carbon chain at the sn-1 position. The intraneuronal accumulation of 1-O-hexadecyl-2-acetyl-sn-glycerophosphocholine (C16:0 PAF), but not its immediate precursor 1-O-hexadecyl-sn-glycerophosphocholine (C16:0 lyso-PAF), participates in signaling tau hyperphosphorylation and compromises neuronal viability. As C16:0 PAF is a naturally occurring lipid involved in cellular signaling, it is likely that mechanisms exist to protect cells against its toxic effects. Here, we utilized a chemical genomic approach to identify key processes specific for regulating the sensitivity of Saccharomyces cerevisiae to alkyacylglycerophosphocholines elevated in Alzheimer's Disease. We identified ten deletion mutants that were hypersensitive to C16:0 PAF and five deletion mutants that were hypersensitive to C16:0 lyso-PAF. Deletion of YDL133w, a previously uncharacterized gene which we have renamed SRF1 (Spo14 Regulatory Factor 1), resulted in the greatest differential sensitivity to C16:0 PAF over C16:0 lyso-PAF. We demonstrate that Srf1 physically interacts with Spo14, yeast phospholipase D (PLD), and is essential for PLD catalytic activity in mitotic cells. Though C16:0 PAF treatment does not impact hydrolysis of phosphatidylcholine in yeast, C16:0 PAF does promote delocalization of GFP-Spo14 and phosphatidic acid from the cell periphery. Furthermore, we demonstrate that, similar to yeast cells, PLD activity is required to protect mammalian neural cells from C16:0 PAF. Together, these findings implicate PLD as a potential neuroprotective target capable of ameliorating disruptions in lipid metabolism in response to accumulating oligomeric amyloid-β42. Accelerated cognitive decline in Alzheimer's patients is associated with accumulation of choline-containing lipids. One of these lipids, C16:0 platelet activating factor (PAF), is specifically elevated in brains of Alzheimer's patients. As elevated exposure to C16:0 PAF ultimately leads to neuronal death, it is crucial to identify underlying mechanisms that mitigate the toxic effects of this lipid. In this study we exploit the conserved biology between humans and baker's yeast to identify key genes that are essential to buffer the toxic effects of C16:0 PAF. We found that Srf1, or Spo14 Regulatory Factor 1, the previously uncharacterized protein Ydl133w, is essential for mitigating the toxic effects of C16:0 PAF in yeast. We determine that Srf1 interacts with yeast phospholipase D (PLD) Spo14 and is required for PLD activity in mitotic cells. Hence we discovered a novel regulator of PLD in yeast. Further, we extend our studies to higher eukaryotes demonstrating that PLD is required to buffer the neurotoxic effect of C16:0 PAF. Our study suggests that therapeutic strategies modulating PLD activity may be effective in ameliorating Alzheimer's Disease pathology associated with disruptions in lipid metabolism.
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Affiliation(s)
- Michael A. Kennedy
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Canada
| | - Nazir Kabbani
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Canada
| | - Jean-Philippe Lambert
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Canada
| | - Leigh Anne Swayne
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Canada
| | - Fida Ahmed
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Canada
| | - Daniel Figeys
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Canada
| | - Steffany A. L. Bennett
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Canada
| | - Jennnifer Bryan
- Michael Smith Laboratories and Department of Statistics, University of British Columbia, Vancouver, Canada
| | - Kristin Baetz
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Canada
- * E-mail:
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