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Lyden PD, Lamb J, Kothari S, Toossi S, Boitano P, Rajput PS. Differential effects of hypothermia on neurovascular unit determine protective or toxic results: Toward optimized therapeutic hypothermia. J Cereb Blood Flow Metab 2019; 39:1693-1709. [PMID: 30461327 PMCID: PMC6727141 DOI: 10.1177/0271678x18814614] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Therapeutic hypothermia (TH) benefits survivors of cardiac arrest and neonatal hypoxic-ischemic injury and may benefit stroke patients. Large TH clinical trials, however, have shown mixed results. Given the substantial pre-clinical literature supporting TH, we explored possible mechanisms for clinical trial variability. Using a standard rodent stroke model (n = 20 per group), we found smaller infarctions after 2 h pre- or post-reperfusion TH compared to 4 h. To explore the mechanism of this discrepancy, we used primary cell cultures of rodent neurons, astrocytes, or endothelial cells subjected to oxygen-glucose deprivation (OGD). Then, cells were randomly assigned to 33℃, 35℃ or 37℃ for varying durations after varying delay times. Both 33 and 35℃ TH effectively preserved all cell types, although 33℃ was superior. Longer cooling durations overcame moderate delays to cooling initiation. In contrast, TH interfered with astrocyte paracrine protection of neurons in a temperature-dependent manner. These findings suggest that longer TH is needed to overcome delays to TH onset, but shorter TH durations may be superior to longer, perhaps due to suppression of astrocytic paracrine support of neurons during injury. We propose a scheme for optimizing TH after cerebral injury to stimulate further studies of cardiac arrest and stroke.
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Affiliation(s)
- Patrick D Lyden
- 1 Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Jessica Lamb
- 1 Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Shweta Kothari
- 1 Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Shahed Toossi
- 1 Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, CA, USA.,2 Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Paul Boitano
- 1 Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Padmesh S Rajput
- 1 Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, CA, USA
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Zhuo Y, Wang L, Ge L, Li X, Duan D, Teng X, Jiang M, Liu K, Yuan T, Wu P, Wang H, Deng Y, Xie H, Chen P, Xia Y, Lu M. Hypoxic Culture Promotes Dopaminergic-Neuronal Differentiation of Nasal Olfactory Mucosa Mesenchymal Stem Cells via Upregulation of Hypoxia-Inducible Factor-1α. Cell Transplant 2017; 26:1452-1461. [PMID: 28901191 PMCID: PMC5680974 DOI: 10.1177/0963689717720291] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 02/14/2017] [Accepted: 02/24/2017] [Indexed: 01/09/2023] Open
Abstract
Olfactory mucosa mesenchymal stem cells (OM-MSCs) display significant clonogenic activity and may be easily propagated for Parkinson's disease therapies. Methods of inducing OM-MSCs to differentiate into dopaminergic (DAergic) neurons using olfactory ensheathing cells (OECs) are thus an attractive topic of research. We designed a hypoxic induction protocol to generate DAergic neurons from OM-MSCs using a physiological oxygen (O2) level of 3% and OEC-conditioned medium (OCM; HI group). The normal induction (NI) group was cultured in O2 at ambient air level (21%). The role of hypoxia-inducible factor-1α (HIF-1α) in the differentiation of OM-MSCs under hypoxia was investigated by treating cells with an HIF-1α inhibitor before induction (HIR group). The proportions of β-tubulin- and tyrosine hydroxylase (TH)-positive cells were significantly increased in the HI group compared with the NI and HIR groups, as shown by immunocytochemistry and Western blotting. Furthermore, the level of dopamine was significantly increased in the HI group. A slow outward potassium current was recorded in differentiated cells after 21 d of induction using whole-cell voltage-clamp tests. A hypoxic environment thus promotes OM-MSCs to differentiate into DAergic neurons by increasing the expression of HIF-1α and by activating downstream target gene TH. This study indicated that OCM under hypoxic conditions could significantly upregulate key transcriptional factors involved in the development of DAergic neurons from OM-MSCs, mediated by HIF-1α. Hypoxia promotes DAergic neuronal differentiation of OM-MSCs, and HIF-1α may play an important role in hypoxia-inducible pathways during DAergic lineage specification and differentiation in vitro.
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Affiliation(s)
- Yi Zhuo
- Key Laboratory of Protein Chemistry and Developmental Biology of Ministry of Education, College of Life Sciences, Hunan Normal University, Changsha, China
| | - Lei Wang
- Department of Neurosurgery, Affiliated Haikou Hospital of Xiangya School of Central South University, Haikou, China
| | - Lite Ge
- Key Laboratory of Protein Chemistry and Developmental Biology of Ministry of Education, College of Life Sciences, Hunan Normal University, Changsha, China
| | - Xuan Li
- Cardiopulmonary Function Test Center, Hunan Cancer Hospital, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, China
| | - Da Duan
- Department of Neurosurgery, The Second Affiliated Hospital of Hunan Normal University (PLA 163 Hospital), Changsha, China
| | - Xiaohua Teng
- Department of Neurosurgery, The Second Affiliated Hospital of Hunan Normal University (PLA 163 Hospital), Changsha, China
| | - Miao Jiang
- Key Laboratory of Protein Chemistry and Developmental Biology of Ministry of Education, College of Life Sciences, Hunan Normal University, Changsha, China
| | - Kai Liu
- Key Laboratory of Protein Chemistry and Developmental Biology of Ministry of Education, College of Life Sciences, Hunan Normal University, Changsha, China
| | - Ting Yuan
- Department of Neurosurgery, The Second Affiliated Hospital of Hunan Normal University (PLA 163 Hospital), Changsha, China
| | - Pei Wu
- Department of Neurosurgery, The Second Affiliated Hospital of Hunan Normal University (PLA 163 Hospital), Changsha, China
| | - Hao Wang
- Department of Neurosurgery, The Second Affiliated Hospital of Hunan Normal University (PLA 163 Hospital), Changsha, China
| | - Yujia Deng
- Department of Neurosurgery, The Second Affiliated Hospital of Hunan Normal University (PLA 163 Hospital), Changsha, China
| | - Huali Xie
- Key Laboratory of Protein Chemistry and Developmental Biology of Ministry of Education, College of Life Sciences, Hunan Normal University, Changsha, China
| | - Ping Chen
- Key Laboratory of Protein Chemistry and Developmental Biology of Ministry of Education, College of Life Sciences, Hunan Normal University, Changsha, China
| | - Ying Xia
- Department of Neurosurgery, Affiliated Haikou Hospital of Xiangya School of Central South University, Haikou, China
| | - Ming Lu
- Key Laboratory of Protein Chemistry and Developmental Biology of Ministry of Education, College of Life Sciences, Hunan Normal University, Changsha, China
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Huang X, Yang K, Zhang Y, Wang Q, Li Y. Quinolinic acid induces cell apoptosis in PC12 cells through HIF-1-dependent RTP801 activation. Metab Brain Dis 2016; 31:435-44. [PMID: 26738727 DOI: 10.1007/s11011-015-9782-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 12/22/2015] [Indexed: 02/01/2023]
Abstract
Neurological disease comprises a series of disorders featuring brain dysfunction and neuronal cell death. Among the factors contributing to neuronal death, excitotoxicity induced by excitatory amino acids, such as glutamate, plays a critical role. However, the mechanisms about how the excitatory amino acids induce neuronal death remain elucidated. In this study, we investigated the role of HIF-1α (hypoxia inducible factor-1α) and RTP801 in cell apoptosis induced by quinolinic acid (QUIN), a glutamatergic agonist, in PC12 cells. We found that QUIN at 5 μM increased the expression of HIF-1α significantly with a peak at 24 h. After the treatment with QUIN (5-20 μM) for 24 h, the cells exhibited decreased viability and cell apoptosis with a concomitant increased expression of apoptosis related proteins. QUIN treatment also induced the generation of intracellular reactive oxygen species and RTP801 up-regulation in a HIF-1α-dependent manner that were inhibited by 2-methoxyestradiol, a HIF-1α inhibitor. Importantly, HIF-1 or RTP801 invalidation by siRNA rescued the cell apoptosis induced by QUIN or cobalt chloride, a chemical inducer of HIF-1. Taken together, these findings support the concept that neurotoxicity induced by QUIN is associated with HIF-1-dependent RTP801 activation and provide insight into the potential of RTP801 inhibitor in treatment of neurological disorders.
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Affiliation(s)
- Xiaojia Huang
- Department of Pharmacology, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China.
| | - Kaiyong Yang
- Department of Pharmacology, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
| | - Yi Zhang
- Department of Pharmacology, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
| | - Qiang Wang
- Department of Preventive Medicine, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
| | - Yongjin Li
- Department of Pharmacology, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, China
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GONG GU, HU LING, LIU YINGHAI, BAI SHURONG, DAI XUEMEI, YIN LIANG, SUN YANGYANG, WANG XIAOWU, HOU LICHAO. Upregulation of HIF-1α protein induces mitochondrial autophagy in primary cortical cell cultures through the inhibition of the mTOR pathway. Int J Mol Med 2014; 34:1133-40. [DOI: 10.3892/ijmm.2014.1850] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Accepted: 06/26/2014] [Indexed: 11/06/2022] Open
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Hyperthermia-Conditioned OECs Serum-Free–Conditioned Medium Induce NSC Differentiation Into Neuron More Efficiently by the Upregulation of HIF-1 Alpha and Binding Activity. Transplantation 2014; 97:1225-32. [DOI: 10.1097/tp.0000000000000118] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Torrente D, Cabezas R, Avila MF, García-Segura LM, Barreto GE, Guedes RCA. Cortical spreading depression in traumatic brain injuries: is there a role for astrocytes? Neurosci Lett 2014; 565:2-6. [PMID: 24394907 DOI: 10.1016/j.neulet.2013.12.058] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 12/21/2013] [Accepted: 12/23/2013] [Indexed: 10/25/2022]
Abstract
Cortical spreading depression (CSD) is a presumably pathophysiological phenomenon that interrupts local cortical function for periods of minutes to hours. This phenomenon is important due to its association with different neurological disorders such as migraine, malignant stroke and traumatic brain injury (TBI). Glial cells, especially astrocytes, play an important role in the regulation of CSD and in the protection of neurons under brain trauma. The correlation of TBI with CSD and the astrocytic function under these conditions remain unclear. This review discusses the possible link of TBI and CSD and its implication for neuronal survival. Additionally, we highlight the importance of astrocytic function for brain protection, and suggest possible therapeutic strategies targeting astrocytes to improve the outcome following TBI-associated CSD.
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Affiliation(s)
- Daniel Torrente
- Departamento de Nutrición y Bioquímica, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá D.C., Colombia
| | - Ricardo Cabezas
- Departamento de Nutrición y Bioquímica, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá D.C., Colombia
| | - Marco Fidel Avila
- Departamento de Nutrición y Bioquímica, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá D.C., Colombia
| | | | - George E Barreto
- Departamento de Nutrición y Bioquímica, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá D.C., Colombia
| | - Rubem Carlos Araújo Guedes
- Departamento de Nutrição, Centro de Ciências da Saúde, Universidade Federal de Pernambuco, Recife, PE, Brazil.
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Evaluation of hypoxia inducible factor expression in inflammatory and neurodegenerative brain models. Int J Biochem Cell Biol 2013; 45:1377-88. [DOI: 10.1016/j.biocel.2013.04.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 04/05/2013] [Accepted: 04/06/2013] [Indexed: 01/31/2023]
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Hypoxia-inducible factor 1 is essential for spontaneous recovery from traumatic brain injury and is a key mediator of heat acclimation induced neuroprotection. J Cereb Blood Flow Metab 2013; 33:524-31. [PMID: 23281425 PMCID: PMC3618386 DOI: 10.1038/jcbfm.2012.193] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Heat acclimation (HA), a well-established preconditioning model, confers neuroprotection in rodent models of traumatic brain injury (TBI). It increases neuroprotective factors, among them is hypoxia-inducible factor 1α (HIF-1α), which is important in the response to postinjury ischemia. However, little is known about the role of HIF-1α in TBI and its contribution to the establishment of the HA protecting phenotype. Therefore, we aimed to explore HIF-1α role in TBI defense mechanisms as well as in HA-induced neuroprotection. Acriflavine was used to inhibit HIF-1 in injured normothermic (NT) or HA mice. After TBI, we evaluated motor function recovery, lesion volume, edema formation, and body temperature as well as HIF-1 downstream transcription targets, such as glucose transporter 1 (GLUT1), vascular endothelial growth factor, and aquaporin 4. We found that HIF-1 inhibition resulted in deterioration of motor function, increased lesion volume, hypothermia, and reduced edema formation. All these parameters were significantly different in the HA mice. Western blot analysis and enzyme-linked immunosorbent assay showed reduced levels of all HIF-1 downstream targets in HA mice, however, only GLUT1 was downregulated in NT mice. We conclude that HIF-1 is a key mediator in both spontaneous recovery and HA-induced neuroprotection after TBI.
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