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Keasey MP, Razskazovskiy V, Jia C, Peterknecht ED, Bradshaw PC, Hagg T. PDIA3 inhibits mitochondrial respiratory function in brain endothelial cells and C. elegans through STAT3 signaling and decreases survival after OGD. Cell Commun Signal 2021; 19:119. [PMID: 34922569 PMCID: PMC8684072 DOI: 10.1186/s12964-021-00794-z] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 10/14/2021] [Indexed: 11/20/2022] Open
Abstract
Background Protein disulfide isomerase A3 (PDIA3, also named GRP58, ER-60, ERp57) is conserved across species and mediates protein folding in the endoplasmic reticulum. PDIA3 is, reportedly, a chaperone for STAT3. However, the role of PDIA3 in regulating mitochondrial bioenergetics and STAT3 phosphorylation at serine 727 (S727) has not been described. Methods Mitochondrial respiration was compared in immortalized human cerebral microvascular cells (CMEC) wild type or null for PDIA3 and in whole organism C. Elegans WT or null for pdi-3 (worm homologue). Mitochondrial morphology and cell signaling pathways in PDIA3-/- and WT cells were assessed. PDIA3-/- cells were subjected to oxygen–glucose deprivation (OGD) to determine the effects of PDIA3 on cell survival after injury. Results We show that PDIA3 gene deletion using CRISPR-Cas9 in cultured CMECs leads to an increase in mitochondrial bioenergetic function. In C. elegans, gene deletion or RNAi knockdown of pdi-3 also increased respiratory rates, confirming a conserved role for this gene in regulating mitochondrial bioenergetics. The PDIA3-/- bioenergetic phenotype was reversed by overexpression of WT PDIA3 in cultured PDIA3-/- CMECs. PDIA3-/- and siRNA knockdown caused an increase in phosphorylation of the S727 residue of STAT3, which is known to promote mitochondrial bioenergetic function. Increased respiration in PDIA3-/- CMECs was reversed by a STAT3 inhibitor. In PDIA3-/- CMECs, mitochondrial membrane potential and reactive oxygen species production, but not mitochondrial mass, was increased, suggesting an increased mitochondrial bioenergetic capacity. Finally, PDIA3-/- CMECs were more resistant to oxygen–glucose deprivation, while STAT3 inhibition reduced the protective effect. Conclusions We have discovered a novel role for PDIA3 in suppressing mitochondrial bioenergetic function by inhibiting STAT3 S727 phosphorylation. Supplementary Information The online version contains supplementary material available at 10.1186/s12964-021-00794-z.
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Affiliation(s)
- Matt P Keasey
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, PO Box 70582, Johnson City, TN, 37614, USA.
| | - V Razskazovskiy
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, PO Box 70582, Johnson City, TN, 37614, USA
| | | | - E D Peterknecht
- Sandwell and West, Birmingham Hospitals NHS Trust, Birmingham, UK
| | - P C Bradshaw
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, PO Box 70582, Johnson City, TN, 37614, USA
| | - T Hagg
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, PO Box 70582, Johnson City, TN, 37614, USA
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Peterknecht E, Keasey MP, Beresford MW. The effectiveness and safety of biological therapeutics in juvenile-onset systemic lupus erythematosus (JSLE): a systematic review. Lupus 2018; 27:2135-2145. [PMID: 30336753 DOI: 10.1177/0961203318804879] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 01/12/2023]
Abstract
OBJECTIVE To systematically review and summarize the available literature regarding the effectiveness and safety of biologics in the treatment of juvenile-onset systemic lupus erythematosus. METHODS PubMed was systematically searched for relevant literature (2012-2017 inclusive) using the following criteria: (1) patients diagnosed with juvenile-onset systemic lupus erythematosus (≤18 years at diagnosis); (2) treatment with any biological agent; and (3) outcome measures assessing effectiveness and safety. Systematic literature reviews, meta-analyses, randomized controlled trials, cohort studies, case control studies, cross sectional surveys and case-series with ≥3 patients were included. Independent extraction of articles by two authors using predefined criteria was performed. The quality of each study was assessed using CASP tools and Oxford CEBM Levels of Evidence. RESULTS Nine articles met inclusion criteria: six cohort studies, two case series and one pilot study, totalling 230 patients. All but one article reported the effects of rituximab, the other those of belimumab. Overall, patients had active disease refractory to standard of care regimens using corticosteroids and immunosuppressants. Available evidence for rituximab demonstrated improvements in disease activity, complement levels and anti-dsDNA titres accompanying a steroid-sparing effect. CONCLUSION Rituximab can be considered an effective treatment in juvenile-onset systemic lupus erythematosus patients with severe disease manifestations and/or refractory disease. Based on current evidence, use of belimumab in juvenile-onset systemic lupus erythematosus patients cannot be recommended. The long-term safety of these biological agents remains uncertain. Further prospective studies, ideally robust randomized controlled trials, are urgently needed to obtain more accurate data on the effectiveness and long-term safety of rituximab, belimumab and other biologics in juvenile-onset systemic lupus erythematosus.
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Affiliation(s)
- E Peterknecht
- 1 University of Liverpool Medical School, University of Liverpool, Liverpool, UK
| | - M P Keasey
- 2 Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, Johnson City, USA
| | - M W Beresford
- 3 Clinical Academic Department of Paediatric Rheumatology, Alder Hey Children's NHS Foundation Trust, Liverpool, UK
- 4 Department of Women's and Children's Health, Institute of Translational Medicine, University of Liverpool, Liverpool, UK
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Banerjee K, Keasey MP, Razskazovskiy V, Visavadiya NP, Jia C, Hagg T. Reduced FAK-STAT3 signaling contributes to ER stress-induced mitochondrial dysfunction and death in endothelial cells. Cell Signal 2017; 36:154-162. [PMID: 28495589 DOI: 10.1016/j.cellsig.2017.05.007] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [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: 02/21/2017] [Revised: 05/05/2017] [Accepted: 05/06/2017] [Indexed: 12/11/2022]
Abstract
Excessive endoplasmic reticulum (ER) stress leads to cell loss in many diseases, e.g., contributing to endothelial cell loss after spinal cord injury. Here, we determined whether ER stress-induced mitochondrial dysfunction could be explained by interruption of the focal adhesion kinase (FAK)-mitochondrial STAT3 pathway we recently discovered. ER stress was induced in brain-derived mouse bEnd5 endothelial cells by thapsigargin or tunicamycin and caused apoptotic cell death over a 72h period. In concert, ER stress caused mitochondrial dysfunction as shown by reduced bioenergetic function, loss of mitochondrial membrane potential and increased mitophagy. ER stress caused a reduction in mitochondrial phosphorylated S727-STAT3, known to be important for maintaining mitochondrial function. Normal activation or phosphorylation of the upstream cytoplasmic FAK was also reduced, through mechanisms that involve tyrosine phosphatases and calcium signaling, as shown by pharmacological inhibitors, bisperoxovanadium (bpV) and 2-aminoethoxydiphenylborane (APB), respectively. APB mitigated the reduction in FAK and STAT3 phosphorylation, and improved endothelial cell survival caused by ER stress. Transfection of cells rendered null for STAT3 using CRISPR technology with STAT3 mutants confirmed the specific involvement of S727-STAT3 inhibition in ER stress-mediated cell loss. These data suggest that loss of FAK signaling during ER stress causes mitochondrial dysfunction by reducing the protective effects of mitochondrial STAT3, leading to endothelial cell death. We propose that stimulation of the FAK-STAT3 pathway is a novel therapeutic approach against pathological ER stress.
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Affiliation(s)
- Kalpita Banerjee
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, PO Box 70582, Johnson City, TN 37614, USA
| | - Matt P Keasey
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, PO Box 70582, Johnson City, TN 37614, USA
| | - Vladislav Razskazovskiy
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, PO Box 70582, Johnson City, TN 37614, USA
| | - Nishant P Visavadiya
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, PO Box 70582, Johnson City, TN 37614, USA
| | - Cuihong Jia
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, PO Box 70582, Johnson City, TN 37614, USA
| | - Theo Hagg
- Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, PO Box 70582, Johnson City, TN 37614, USA.
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Keasey MP, Lemos RR, Hagg T, Oliveira JRM. Vitamin-D receptor agonist calcitriol reduces calcification in vitro through selective upregulation of SLC20A2 but not SLC20A1 or XPR1. Sci Rep 2016; 6:25802. [PMID: 27184385 PMCID: PMC4868979 DOI: 10.1038/srep25802] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 04/21/2016] [Indexed: 01/30/2023] Open
Abstract
Vitamin D deficiency (hypovitaminosis D) causes osteomalacia and poor long bone mineralization. In apparent contrast, hypovitaminosis D has been reported in patients with primary brain calcifications (“Fahr’s disease”). We evaluated the expression of two phosphate transporters which we have found to be associated with primary brain calcification (SLC20A2, whose promoter has a predicted vitamin D receptor binding site, and XPR1), and one unassociated (SLC20A1), in an in vitro model of calcification. Expression of all three genes was significantly decreased in calcifying human bone osteosarcoma (SaOs-2) cells. Further, we confirmed that vitamin D (calcitriol) reduced calcification as measured by Alizarin Red staining. Cells incubated with calcitriol under calcifying conditions specifically maintained expression of the phosphate transporter SLC20A2 at higher levels relative to controls, by RT-qPCR. Neither SLC20A1 nor XPR1 were affected by calcitriol treatment and remained suppressed. Critically, knockdown of SLC20A2 gene and protein with CRISPR technology in SaOs2 cells significantly ablated vitamin D mediated inhibition of calcification. This study elucidates the mechanistic importance of SLC20A2 in suppressing the calcification process. It also suggests that vitamin D might be used to regulate SLC20A2 gene expression, as well as reduce brain calcification which occurs in Fahr’s disease and normal aging.
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Affiliation(s)
- M P Keasey
- Department of Biomedical Sciences - Quillen College of Medicine, East Tennessee State University, Johnson City, USA.,Keizo Asami Laboratory - Federal University of Pernambuco, Recife-PE, Brazil
| | - R R Lemos
- Keizo Asami Laboratory - Federal University of Pernambuco, Recife-PE, Brazil
| | - T Hagg
- Department of Biomedical Sciences - Quillen College of Medicine, East Tennessee State University, Johnson City, USA
| | - J R M Oliveira
- Keizo Asami Laboratory - Federal University of Pernambuco, Recife-PE, Brazil.,Neuropsychiatry Department - Federal University of Pernambuco, Recife-PE, Brazil
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Keasey MP, Oliveira JRM. Letter to the editor on "Demoulin JB, Essaghir A. PDGF receptor signaling networks in normal and cancer cells. Cytokine Growth Factor Rev (2014)". Cytokine Growth Factor Rev 2014; 25:245. [PMID: 24803012 DOI: 10.1016/j.cytogfr.2014.04.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Accepted: 04/04/2014] [Indexed: 01/09/2023]
Affiliation(s)
- M P Keasey
- Keizo Asami Laboratory, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - J R M Oliveira
- Keizo Asami Laboratory, Federal University of Pernambuco, Recife, Pernambuco, Brazil; Neuropsychiatry Department, Federal University of Pernambuco, Recife, Pernambuco, Brazil.
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Howarth JL, Kelly S, Keasey MP, Glover CPJ, Lee YB, Mitrophanous K, Chapple JP, Gallo JM, Cheetham ME, Uney JB. Hsp40 Molecules That Target to the Ubiquitin-proteasome System Decrease Inclusion Formation in Models of Polyglutamine Disease. Mol Ther 2007; 15:1100-1105. [PMID: 17426712 DOI: 10.1038/sj.mt.6300163] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2006] [Accepted: 03/05/2007] [Indexed: 12/29/2022] Open
Abstract
We studied the ability of heat shock, DnaJ-like-1 (HSJ1) proteins (which contain DnaJ and ubiquitin-interacting motifs) to reduce polyglutamine-mediated inclusion formation. The experiments demonstrated that expression of heat shock protein 70 (hsp70), hsp40, HSJ1a, and HSJ1b significantly reduced protein inclusion formation in a model of spinal and bulbar muscular atrophy (SBMA). HSJ1a also mediated a significant decrease in the number of inclusions formed in a primary neuronal model of protein aggregation. Studies to elucidate the mechanisms underlying these reductions showed that hsp70 and hsp40 increased chaperone-mediated refolding. In contrast, expression of HSJ1 proteins did not promote chaperone activity but caused an increase in ubiquitylation. Furthermore, HSJ1a was associated with a ubiquitylated luciferase complex, and in the presence of HSJ1a but not an HSJ1a UIM mutant (HSJ1a-deltaUIM) there was a reduction in luciferase protein levels. Together these results show that HSJ1 proteins mediated an increase in target protein degradation via the ubiquitin-proteasome system (UPS). We also found that the expression of HSJ1a significantly decreased the number of neurons containing inclusions in an in vivo model of polyglutamine disease. These findings indicate that targeted modification of the UPS to facilitate degradation of misfolded proteins may represent a highly effective therapeutic avenue for the treatment of polyglutamine disease.
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MESH Headings
- Animals
- Blotting, Western
- Cell Line, Tumor
- Cells, Cultured
- Dependovirus/genetics
- Genetic Vectors/genetics
- HSP40 Heat-Shock Proteins/genetics
- HSP40 Heat-Shock Proteins/physiology
- HSP70 Heat-Shock Proteins/genetics
- HSP70 Heat-Shock Proteins/physiology
- Immunohistochemistry
- Immunoprecipitation
- Inclusion Bodies/metabolism
- Luciferases/chemistry
- Luciferases/genetics
- Luciferases/metabolism
- Male
- Microscopy, Fluorescence
- Muscular Atrophy, Spinal/metabolism
- Muscular Atrophy, Spinal/pathology
- Muscular Atrophy, Spinal/therapy
- Neurons/metabolism
- Peptides/genetics
- Peptides/metabolism
- Proteasome Endopeptidase Complex/metabolism
- Protein Folding
- Rats
- Rats, Sprague-Dawley
- Rats, Wistar
- Receptors, Androgen/genetics
- Receptors, Androgen/physiology
- Transfection
- Ubiquitin/metabolism
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Affiliation(s)
- J L Howarth
- Henry Wellcome Laboratories for Integrated Neuroscience and Endocrinology, University of Bristol, Bristol, UK
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