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Fritsch LE, Kelly C, Leonard J, de Jager C, Wei X, Brindley S, Harris EA, Kaloss AM, DeFoor N, Paul S, O'Malley H, Ju J, Olsen ML, Theus MH, Pickrell AM. STING-Dependent Signaling in Microglia or Peripheral Immune Cells Orchestrates the Early Inflammatory Response and Influences Brain Injury Outcome. J Neurosci 2024; 44:e0191232024. [PMID: 38360749 PMCID: PMC10957216 DOI: 10.1523/jneurosci.0191-23.2024] [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: 01/31/2023] [Revised: 12/16/2023] [Accepted: 01/02/2024] [Indexed: 02/17/2024] Open
Abstract
While originally identified as an antiviral pathway, recent work has implicated that cyclic GMP-AMP-synthase-Stimulator of Interferon Genes (cGAS-STING) signaling is playing a critical role in the neuroinflammatory response to traumatic brain injury (TBI). STING activation results in a robust inflammatory response characterized by the production of inflammatory cytokines called interferons, as well as hundreds of interferon stimulated genes (ISGs). Global knock-out (KO) mice inhibiting this pathway display neuroprotection with evidence that this pathway is active days after injury; yet, the early neuroinflammatory events stimulated by STING signaling remain understudied. Furthermore, the source of STING signaling during brain injury is unknown. Using a murine controlled cortical impact (CCI) model of TBI, we investigated the peripheral immune and microglial response to injury utilizing male chimeric and conditional STING KO animals, respectively. We demonstrate that peripheral and microglial STING signaling contribute to negative outcomes in cortical lesion volume, cell death, and functional outcomes postinjury. A reduction in overall peripheral immune cell and neutrophil infiltration at the injury site is STING dependent in these models at 24 h. Transcriptomic analysis at 2 h, when STING is active, reveals that microglia drive an early, distinct transcriptional program to elicit proinflammatory genes including interleukin 1-β (IL-1β), which is lost in conditional knock-out mice. The upregulation of alternative innate immune pathways also occurs after injury in these animals, which supports a complex relationship between brain-resident and peripheral immune cells to coordinate the proinflammatory response and immune cell influx to damaged tissue after injury.
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Affiliation(s)
- Lauren E Fritsch
- Graduate Program in Translational Biology, Medicine, and Health, Virginia Polytechnic Institute and State University, Roanoke, Virginia 24016
| | - Colin Kelly
- Graduate Program in Translational Biology, Medicine, and Health, Virginia Polytechnic Institute and State University, Roanoke, Virginia 24016
| | - John Leonard
- Department of Biomedical Sciences and Pathobiology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - Caroline de Jager
- Graduate Program in Translational Biology, Medicine, and Health, Virginia Polytechnic Institute and State University, Roanoke, Virginia 24016
| | - Xiaoran Wei
- Biomedical and Veterinary Sciences Graduate Program, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - Samantha Brindley
- School of Neuroscience, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - Elizabeth A Harris
- Biomedical and Veterinary Sciences Graduate Program, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - Alexandra M Kaloss
- Biomedical and Veterinary Sciences Graduate Program, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - Nicole DeFoor
- School of Neuroscience, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - Swagatika Paul
- Biomedical and Veterinary Sciences Graduate Program, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - Hannah O'Malley
- School of Neuroscience, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - Jing Ju
- Biomedical and Veterinary Sciences Graduate Program, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - Michelle L Olsen
- School of Neuroscience, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - Michelle H Theus
- Department of Biomedical Sciences and Pathobiology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - Alicia M Pickrell
- School of Neuroscience, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
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DeFoor N, Paul S, Li S, Basso EKG, Stevenson V, Browning JL, Prater AK, Brindley S, Tao G, Pickrell AM. Remdesivir increases mtDNA copy number causing mild alterations to oxidative phosphorylation. Sci Rep 2023; 13:15339. [PMID: 37714940 PMCID: PMC10504289 DOI: 10.1038/s41598-023-42704-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: 05/29/2023] [Accepted: 09/13/2023] [Indexed: 09/17/2023] Open
Abstract
SARS-CoV-2 causes the severe respiratory disease COVID-19. Remdesivir (RDV) was the first fast-tracked FDA approved treatment drug for COVID-19. RDV acts as an antiviral ribonucleoside (adenosine) analogue that becomes active once it accumulates intracellularly. It then diffuses into the host cell and terminates viral RNA transcription. Previous studies have shown that certain nucleoside analogues unintentionally inhibit mitochondrial RNA or DNA polymerases or cause mutational changes to mitochondrial DNA (mtDNA). These past findings on the mitochondrial toxicity of ribonucleoside analogues motivated us to investigate what effects RDV may have on mitochondrial function. Using in vitro and in vivo rodent models treated with RDV, we observed increases in mtDNA copy number in Mv1Lu cells (35.26% increase ± 11.33%) and liver (100.27% increase ± 32.73%) upon treatment. However, these increases only resulted in mild changes to mitochondrial function. Surprisingly, skeletal muscle and heart were extremely resistant to RDV treatment, tissues that have preferentially been affected by other nucleoside analogues. Although our data suggest that RDV does not greatly impact mitochondrial function, these data are insightful for the treatment of RDV for individuals with mitochondrial disease.
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Affiliation(s)
- Nicole DeFoor
- School of Neuroscience, Virginia Tech, Life Science I Room 217, 970 Washington Street SW, Blacksburg, VA, 24061, USA
| | - Swagatika Paul
- Graduate Program in Biomedical and Veterinary Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
| | - Shuang Li
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Erwin K Gudenschwager Basso
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
| | - Valentina Stevenson
- Virginia Tech Animal Laboratory Services, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, 24061, USA
| | - Jack L Browning
- School of Neuroscience, Virginia Tech, Life Science I Room 217, 970 Washington Street SW, Blacksburg, VA, 24061, USA
| | - Anna K Prater
- School of Neuroscience, Virginia Tech, Life Science I Room 217, 970 Washington Street SW, Blacksburg, VA, 24061, USA
| | - Samantha Brindley
- School of Neuroscience, Virginia Tech, Life Science I Room 217, 970 Washington Street SW, Blacksburg, VA, 24061, USA
| | - Ge Tao
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Alicia M Pickrell
- School of Neuroscience, Virginia Tech, Life Science I Room 217, 970 Washington Street SW, Blacksburg, VA, 24061, USA.
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AlShabib A, Brindley S, Satterthwaite J. Evaluation of the Efficacy of Two Fibre-Reinforced Post Removal Techniques. Eur J Prosthodont Restor Dent 2022; 30:239-244. [PMID: 35038254 DOI: 10.1922/ejprd_02101alshabib06] [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] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
OBJECTIVE The aim of this in-vitro study was to compare the amount of material (post and luting agent) and root dentine removed using two methods for removal of endodontic posts. METHODS Human premolar teeth (n=20) were sectioned at the CEJ and fibre reinforced posts were cemented at a length of 10mm following root canal therapy. Teeth were randomly assigned to two study groups. The methods of removal compared were: the use of RTD re-access kit (Composipost, RTD, France, St Egreve) in a conventional hand-piece driven by an electric motor (Group A); or a long tapered diamond bur (FG Diamond grit bur, Dentsply Ltd, UK) in an air-driven high speed turbine (Group B). Using micro- CT the volume of material and root dentine removed for each sample was calculated. RESULTS Both the volume of material removed and the volume of root dentine removed were significantly greater when using diamond burs. (p⟨0.001). The volume of dentine removed using the diamond bur method (mean 22.64mm³) was greater than the volume removed using the reaccess kit (mean 11.71mm³). SIGNIFICANCE Use of a diamond bur to remove fibre reinforced endodontic post removal poses higher risk for root perforation compared to the reaccess kit.
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Affiliation(s)
- A AlShabib
- School of Medical Sciences, Division of Dentistry, University of Manchester, UK
- Department of Restorative Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
| | - S Brindley
- Royal Stoke Hospital, University Hospital North Midlands, UK
| | - J Satterthwaite
- School of Medical Sciences, Division of Dentistry, University of Manchester, UK
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McDonald MM, Brindley S, Halperin E, Saguy T. Promoting intergroup openness and support for equality in a new cultural context: Replicating the effects of internal criticism. J Soc Psychol 2018; 159:349-356. [PMID: 30001191 DOI: 10.1080/00224545.2018.1491470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Exposure to an outgroup member voicing criticism of his or her own group fosters greater openness to the outgroup's perspective. Research suggests that this effect owes its influence to a serial process in which participants' perception of the risk involved in voicing internal criticism leads to an increase in the perceived credibility of the speaker. The credibility makes it possible for the speaker to be viewed as open-minded, which subsequently inspires greater hope. This process culminates in an increased openness to the outgroup. These findings have been restricted to the Israeli-Palestinian conflict, but here we examine their generalizability to racial conflict in the United States. Results reveal that White Americans exposed to internal criticism expressed by a Black authority figure express greater openness to African-American perspectives on race relations and are more willing to support policies of racial equality. Replicating past research, this effect is serially mediated by risk, credibility, and hope.
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McDonald M, Brindley S, Halperin E, Saguy T. Outgroup members' internal criticism promotes intergroup openness: The role of perceived risk. Br J Soc Psychol 2017; 57:95-111. [PMID: 29150851 DOI: 10.1111/bjso.12231] [Citation(s) in RCA: 5] [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: 02/13/2017] [Revised: 10/16/2017] [Indexed: 11/28/2022]
Abstract
Research suggests that hearing an outgroup member voice internal criticism increases individuals' openness to the outgroup's perspective. We replicate and extend these findings in the context of the Israeli-Palestinian conflict. Israeli participants exposed to a Palestinian official voicing internal criticism reported more openness to the Palestinian narrative of the conflict, an effect that was mediated by an increase in participants' perception that Palestinians are open-minded and a subsequent increase in their hope for more positive relations between the two groups. In our extension of these findings, we examined a complementary mechanism contributing to the effectiveness of the criticism manipulation, specifically the extent to which participants perceive that the Palestinian official took a risk voicing criticism of Palestinians. Positive messages from a hostile outgroup may be received with suspicion, but if they are articulated under great risk to the speaker, greater credibility may be granted. Across two studies, we demonstrate that the criticism conveys risk to the speaker and that this risk is predictive of the perceived credibility of the speaker, and participants' subsequent openness to the outgroup's perspective.
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Affiliation(s)
- Melissa McDonald
- Department of Psychology, Oakland University, Rochester, Michigan, USA
| | - Samantha Brindley
- Department of Psychology, Oakland University, Rochester, Michigan, USA
| | - Eran Halperin
- School of Psychology, Interdisciplinary Center (IDC), Herzliya, Israel
| | - Tamar Saguy
- School of Psychology, Interdisciplinary Center (IDC), Herzliya, Israel
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Greetham D, Wimalasena T, Kerruish DWM, Brindley S, Ibbett RN, Linforth RL, Tucker G, Phister TG, Smart KA. Development of a phenotypic assay for characterisation of ethanologenic yeast strain sensitivity to inhibitors released from lignocellulosic feedstocks. J Ind Microbiol Biotechnol 2014; 41:931-45. [PMID: 24664516 DOI: 10.1007/s10295-014-1431-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Accepted: 02/26/2014] [Indexed: 12/16/2022]
Abstract
Inhibitors released by the breakdown of plant cell walls prevent efficient conversion of sugar into ethanol. The aim of this study was to develop a fast and reliable inhibitor sensitivity assay for ethanologenic yeast strains. The assay comprised bespoke 96-well plates containing inhibitors in isolation or combination in a format that was compatible with the Phenotypic Microarray Omnilog reader (Biolog, hayward, CA, USA). A redox reporter within the assay permits analysis of inhibitor sensitivity in aerobic and/or anaerobic conditions. Results from the assay were verified using growth on spot plates and tolerance assays in which maintenance of viability was assessed. The assay allows for individual and synergistic effects of inhibitors to be determined. It was observed that the presence of both acetic and formic acid significantly inhibited the yeast strains assessed, although this impact could be partially mitigated by buffering to neutral pH. Scheffersomyces stipitis, Candida spp., and Pichia guilliermondii demonstrated increased sensitivity to short chain weak acids at concentrations typically present in lignocellulosic hydrolysates. S. cerevisiae exhibited robustness to short chain weak acids at these concentrations. However, S. stipitis, Candida spp., and P. guilliermondii displayed increased tolerance to HMF when compared to that observed for S. cerevisiae. The results demonstrate that the phenotypic microarray assay developed in the current study is a valuable tool that can be used to identify yeast strains with desirable resistance to inhibitory compounds found in lignocellulosic hydrolysates.
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Affiliation(s)
- D Greetham
- Bioenergy and Brewing Science, School of Biosciences, Sutton Bonington Campus, University of Nottingham, Loughborough, Leicestershire, LE12 6RD, UK,
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