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Hubbard WB, Velmurugan GV, Sullivan PG. The role of mitochondrial uncoupling in the regulation of mitostasis after traumatic brain injury. Neurochem Int 2024; 174:105680. [PMID: 38311216 PMCID: PMC10922998 DOI: 10.1016/j.neuint.2024.105680] [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: 11/03/2023] [Revised: 01/24/2024] [Accepted: 01/25/2024] [Indexed: 02/10/2024]
Abstract
Mitostasis, the maintenance of healthy mitochondria, plays a critical role in brain health. The brain's high energy demands and reliance on mitochondria for energy production make mitostasis vital for neuronal function. Traumatic brain injury (TBI) disrupts mitochondrial homeostasis, leading to secondary cellular damage, neuronal degeneration, and cognitive deficits. Mild mitochondrial uncoupling, which dissociates ATP production from oxygen consumption, offers a promising avenue for TBI treatment. Accumulating evidence, from endogenous and exogenous mitochondrial uncoupling, suggests that mitostasis is closely regulating by mitochondrial uncoupling and cellular injury environments may be more sensitive to uncoupling. Mitochondrial uncoupling can mitigate calcium overload, reduce oxidative stress, and induce mitochondrial proteostasis and mitophagy, a process that eliminates damaged mitochondria. The interplay between mitochondrial uncoupling and mitostasis is ripe for further investigation in the context of TBI. These multi-faceted mechanisms of action for mitochondrial uncoupling hold promise for TBI therapy, with the potential to restore mitochondrial health, improve neurological outcomes, and prevent long-term TBI-related pathology.
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Affiliation(s)
- W Brad Hubbard
- Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY, USA; Department of Physiology, University of Kentucky, Lexington, KY, USA; Lexington Veterans' Affairs Healthcare System, Lexington, KY, USA.
| | - Gopal V Velmurugan
- Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY, USA; Department of Neuroscience, University of Kentucky, Lexington, KY, USA
| | - Patrick G Sullivan
- Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY, USA; Lexington Veterans' Affairs Healthcare System, Lexington, KY, USA; Department of Neuroscience, University of Kentucky, Lexington, KY, USA.
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Hansson MJ, Elmér E. Cyclosporine as Therapy for Traumatic Brain Injury. Neurotherapeutics 2023; 20:1482-1495. [PMID: 37561274 PMCID: PMC10684836 DOI: 10.1007/s13311-023-01414-z] [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] [Accepted: 07/19/2023] [Indexed: 08/11/2023] Open
Abstract
Drug development in traumatic brain injury (TBI) has been impeded by the complexity and heterogeneity of the disease pathology, as well as limited understanding of the secondary injury cascade that follows the initial trauma. As a result, patients with TBI have an unmet need for effective pharmacological therapies. One promising drug candidate is cyclosporine, a polypeptide traditionally used to achieve immunosuppression in transplant recipients. Cyclosporine inhibits mitochondrial permeability transition, thereby reducing secondary brain injury, and has shown neuroprotective effects in multiple preclinical models of TBI. Moreover, the cyclosporine formulation NeuroSTAT® displayed positive effects on injury biomarker levels in patients with severe TBI enrolled in the Phase Ib/IIa Copenhagen Head Injury Ciclosporin trial (NCT01825044). Future research on neuroprotective compounds such as cyclosporine should take advantage of recent advances in fluid-based biomarkers and neuroimaging to select patients with similar disease pathologies for clinical trials. This would increase statistical power and allow for more accurate assessment of long-term outcomes.
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Affiliation(s)
- Magnus J Hansson
- Abliva AB, Lund, Sweden.
- Department of Clinical Sciences, Mitochondrial Medicine, Lund University, Lund, Sweden.
| | - Eskil Elmér
- Abliva AB, Lund, Sweden
- Department of Clinical Sciences, Mitochondrial Medicine, Lund University, Lund, Sweden
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Patel SP, Michael FM, Gollihue JL, Brad Hubbard W, Sullivan PG, Rabchevsky AG. Delivery of mitoceuticals or respiratory competent mitochondria to sites of neurotrauma. Mitochondrion 2023; 68:10-14. [PMID: 36371072 PMCID: PMC9805511 DOI: 10.1016/j.mito.2022.11.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Accepted: 11/04/2022] [Indexed: 11/10/2022]
Abstract
Herein, we review evidence that targeting mitochondrial dysfunction with 'mitoceuticals' is an effective neuroprotective strategy following neurotrauma, and that isolated exogenous mitochondria can be effectively transplanted into host spinal cord parenchyma to increase overall cellular metabolism. We further discuss control measures to ensure greatest potential for mitochondrial transfer, notably using erodible thermogelling hydrogels to deliver respiratory competent mitochondria to the injured spinal cord.
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Affiliation(s)
- Samir P Patel
- University of Kentucky, Spinal Cord & Brain Injury Research Center, United States; Departments of Physiology & Neuroscience, College of Medicine, Lexington, KY 40536-0509, United States
| | - Felicia M Michael
- University of Kentucky, Spinal Cord & Brain Injury Research Center, United States; Departments of Physiology & Neuroscience, College of Medicine, Lexington, KY 40536-0509, United States
| | - Jenna L Gollihue
- Sanders-Brown Center on Aging, College of Medicine, Lexington, KY 40536-0230, United States
| | - W Brad Hubbard
- University of Kentucky, Spinal Cord & Brain Injury Research Center, United States; Lexington VA Healthcare System, Lexington, KY 40502, United States
| | - Patrick G Sullivan
- Departments of Physiology & Neuroscience, College of Medicine, Lexington, KY 40536-0509, United States; Lexington VA Healthcare System, Lexington, KY 40502, United States
| | - Alexander G Rabchevsky
- University of Kentucky, Spinal Cord & Brain Injury Research Center, United States; Departments of Physiology & Neuroscience, College of Medicine, Lexington, KY 40536-0509, United States; Lexington VA Healthcare System, Lexington, KY 40502, United States.
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Bernardi P, Pavlov E. Mitochondrial Permeability Transition. Cells 2022; 11. [PMID: 36497124 DOI: 10.3390/cells11233866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 11/29/2022] [Indexed: 12/02/2022] Open
Abstract
The mitochondrial permeability transition (PT) is a phenomenon that can be broadly defined as an increase in the permeability of the mitochondrial inner membrane [...].
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Abstract
Traumatic brain injury (TBI) is a major cause of death and disability in the population worldwide, of which key injury mechanism involving the death of nerve cells. Many recent studies have shown that regulatory necrosis is involved in the pathological process of TBI which includes necroptosis, pyroptosis, ferroptosis, parthanatos, and Cyclophilin D (CypD) mediated necrosis. Therefore, targeting the signaling pathways involved in regulatory necrosis may be an effective strategy to reduce the secondary injury after TBI. Meanwhile, drugs or genes are used as interference factors in various types of regulatory necrosis, so as to explore the potential treatment methods for the secondary injury after TBI. This review summarizes the current progress on regulatory necrosis in TBI.
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Kobayashi T, Uchino H, Elmér E, Ogihara Y, Fujita H, Sekine S, Ishida Y, Saiki I, Shibata S, Kawachi A. Disease Outcome and Brain Metabolomics of Cyclophilin-D Knockout Mice in Sepsis. Int J Mol Sci 2022; 23:961. [PMID: 35055146 PMCID: PMC8779771 DOI: 10.3390/ijms23020961] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 01/12/2022] [Accepted: 01/12/2022] [Indexed: 02/04/2023] Open
Abstract
Sepsis-associated encephalopathy (SAE) is a diffuse brain dysfunction resulting from a systemic inflammatory response to infection, but the mechanism remains unclear. The mitochondrial permeability transition pore (MPTP) could play a central role in the neuronal dysfunction, induction of apoptosis, and cell death in SAE. The mitochondrial isomerase cyclophilin D (CypD) is known to control the sensitivity of MPTP induction. We, therefore, established a cecal ligation and puncture (CLP) model, which is the gold standard in sepsis research, using CypD knockout (CypD KO) mice, and analyzed the disease phenotype and the possible molecular mechanism of SAE through metabolomic analyses of brain tissue. A comparison of adult, male wild-type, and CypD KO mice demonstrated statistically significant differences in body temperature, mortality, and histological changes. In the metabolomic analysis, the main finding was the maintenance of reduced glutathione (GSH) levels and the reduced glutathione/oxidized glutathione (GSH/GSSG) ratio in the KO animals following CLP. In conclusion, we demonstrate that CypD is implicated in the pathogenesis of SAE, possibly related to the inhibition of MPTP induction and, as a consequence, the decreased production of ROS and other free radicals, thereby protecting mitochondrial and cellular function.
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Affiliation(s)
- Takayuki Kobayashi
- Department of Anesthesiology, Tokyo Medical University, Tokyo 160-0023, Japan; (H.U.); (Y.O.); (S.S.); (Y.I.); (I.S.); (S.S.); (A.K.)
| | - Hiroyuki Uchino
- Department of Anesthesiology, Tokyo Medical University, Tokyo 160-0023, Japan; (H.U.); (Y.O.); (S.S.); (Y.I.); (I.S.); (S.S.); (A.K.)
| | - Eskil Elmér
- Mitochondrial Medicine, Department of Clinical Sciences, Lund University, 221 84 Lund, Sweden;
| | - Yukihiko Ogihara
- Department of Anesthesiology, Tokyo Medical University, Tokyo 160-0023, Japan; (H.U.); (Y.O.); (S.S.); (Y.I.); (I.S.); (S.S.); (A.K.)
| | - Hidetoshi Fujita
- Department of Biomedical Engineering, Osaka Institute of Technology, Osaka 535-8585, Japan;
| | - Shusuke Sekine
- Department of Anesthesiology, Tokyo Medical University, Tokyo 160-0023, Japan; (H.U.); (Y.O.); (S.S.); (Y.I.); (I.S.); (S.S.); (A.K.)
| | - Yusuke Ishida
- Department of Anesthesiology, Tokyo Medical University, Tokyo 160-0023, Japan; (H.U.); (Y.O.); (S.S.); (Y.I.); (I.S.); (S.S.); (A.K.)
| | - Iwao Saiki
- Department of Anesthesiology, Tokyo Medical University, Tokyo 160-0023, Japan; (H.U.); (Y.O.); (S.S.); (Y.I.); (I.S.); (S.S.); (A.K.)
| | - Shoichiro Shibata
- Department of Anesthesiology, Tokyo Medical University, Tokyo 160-0023, Japan; (H.U.); (Y.O.); (S.S.); (Y.I.); (I.S.); (S.S.); (A.K.)
| | - Aya Kawachi
- Department of Anesthesiology, Tokyo Medical University, Tokyo 160-0023, Japan; (H.U.); (Y.O.); (S.S.); (Y.I.); (I.S.); (S.S.); (A.K.)
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Abstract
The loss of mitochondrial cristae integrity and mitochondrial swelling are hallmarks of multiple forms of necrotic cell death. One of the most well-studied and relevant inducers of mitochondrial swelling is matrix calcium (Ca2+). Respiring mitochondria will intake available Ca2+ into their matrix until a threshold is reached which triggers the opening of the mitochondrial permeability transition pore (MPTP). Upon opening of the pore, mitochondrial membrane potential dissipates and the mitochondria begin to swell, rendering them dysfunctional. The total amount of Ca2+ taken up by a mitochondrion prior to the engagement of the MPTP is referred to as mitochondrial Ca2+ retention capacity (CRC). The CRC/swelling assay is a useful tool for observing the dose-dependent event of mitochondrial dysfunction in real-time. In this technique, isolated mitochondria are treated with specific boluses of Ca2+ until they reach CRC and undergo swelling. A fluorometer is utilized to detect an increase in transmitted light passing through the sample as the mitochondria lose cristae density, and simultaneously measures calcium uptake by way of a Ca2+-specific membrane impermeable fluorescent dye. Here we provide a detailed protocol describing the mitochondrial CRC/swelling assay and we discuss how varying amounts of mitochondria and Ca2+ added to the system affect the dose-dependency of the assay. We also report how to validate the assay by using MPTP and calcium uptake inhibitors and troubleshooting common mistakes that occur with this approach.
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Affiliation(s)
- Arielys M Mendoza
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX, USA
| | - Jason Karch
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX, USA.
- Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX, USA.
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