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Clemons GA, Silva ACE, Acosta CH, Udo MSB, Tesic V, Rodgers KM, Wu CYC, Citadin CT, Lee RHC, Neumann JT, Allani S, Prentice H, Zhang Q, Lin HW. Protein arginine methyltransferase 4 modulates nitric oxide synthase uncoupling and cerebral blood flow in Alzheimer's disease. J Cell Physiol 2022:10.1002/jcp.30858. [PMID: 36036549 PMCID: PMC9971360 DOI: 10.1002/jcp.30858] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 07/17/2022] [Accepted: 08/08/2022] [Indexed: 12/14/2022]
Abstract
Alzheimer's disease (AD) is the leading cause of mortality, disability, and long-term care burden in the United States, with women comprising the majority of AD diagnoses. While AD-related dementia is associated with tau and amyloid beta accumulation, concurrent derangements in cerebral blood flow have been observed alongside these proteinopathies in humans and rodent models. The homeostatic production of nitric oxide synthases (NOS) becomes uncoupled in AD which leads to decreased NO-mediated vasodilation and oxidative stress via the production of peroxynitrite (ONOO-∙) superoxide species. Here, we investigate the role of the novel protein arginine methyltransferase 4 (PRMT4) enzyme function and its downstream product asymmetric dimethyl arginine (ADMA) as it relates to NOS dysregulation and cerebral blood flow in AD. ADMA (type-1 PRMT product) has been shown to bind NOS as a noncanonic ligand causing enzymatic dysfunction. Our results from RT-qPCR and protein analyses suggest that aged (9-12 months) female mice bearing tau- and amyloid beta-producing transgenic mutations (3xTg-AD) express higher levels of PRMT4 in the hippocampus when compared to age- and sex-matched C57BL6/J mice. In addition, we performed studies to quantify the expression and activity of different NOS isoforms. Furthermore, laser speckle contrast imaging analysis was indicative that 3xTg-AD mice have dysfunctional NOS activity, resulting in reduced production of NO metabolites, enhanced production of free-radical ONOO-, and decreased cerebral blood flow. Notably, the aforementioned phenomena can be reversed via pharmacologic PRMT4 inhibition. Together, these findings implicate the potential importance of PRMT4 signaling in the pathogenesis of Alzheimer's-related cerebrovascular derangement.
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Affiliation(s)
- Garrett A Clemons
- Department of Cellular Biology & Anatomy, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
| | | | - Christina H Acosta
- Department of Cellular Biology & Anatomy, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
| | - Mariana Sayuri Berto Udo
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
| | - Vesna Tesic
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
| | - Krista M Rodgers
- Department of Cellular Biology & Anatomy, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
| | - Celeste Yin-Chieh Wu
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
| | - Cristiane T Citadin
- Department of Cellular Biology & Anatomy, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
| | - Reggie Hui-Chao Lee
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
| | - Jake T Neumann
- Department of Biomedical Sciences, West Virginia School of Osteopathic Medicine, Lewisburg, West Virginia, USA
| | - Shailaja Allani
- Center for Molecular Biology and Biotechnology, Florida Atlantic University, Jupiter, Florida, USA
| | - Howard Prentice
- Department of Biomedical Sciences, Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, Florida, USA
| | - Quanguang Zhang
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
| | - Hung Wen Lin
- Department of Cellular Biology & Anatomy, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA
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2
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Couto E Silva A, Wu CYC, Clemons GA, Acosta CH, Chen CT, Possoit HE, Citadin CT, Lee RHC, Brown JI, Frankel A, Lin HW. Protein arginine methyltransferase 8 modulates mitochondrial bioenergetics and neuroinflammation after hypoxic stress. J Neurochem 2021; 159:742-761. [PMID: 34216036 DOI: 10.1111/jnc.15462] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 06/26/2021] [Accepted: 06/27/2021] [Indexed: 11/28/2022]
Abstract
Protein arginine methyltransferases (PRMTs) are a family of enzymes involved in gene regulation and protein/histone modifications. PRMT8 is primarily expressed in the central nervous system, specifically within the cellular membrane and synaptic vesicles. Recently, PRMT8 has been described to play key roles in neuronal signaling such as a regulator of dendritic arborization, synaptic function and maturation, and neuronal differentiation and plasticity. Here, we examined the role of PRMT8 in response to hypoxia-induced stress in brain metabolism. Our results from liquid chromatography mass spectrometry, mitochondrial oxygen consumption rate (OCR), and protein analyses indicate that PRMT8(-/-) knockout mice presented with altered membrane phospholipid composition, decreased mitochondrial stress capacity, and increased neuroinflammatory markers, such as TNF-α and ionized calcium binding adaptor molecule 1 (Iba1, a specific marker for microglia/macrophage activation) after hypoxic stress. Furthermore, adenovirus-based overexpression of PRMT8 reversed the changes in membrane phospholipid composition, mitochondrial stress capacity, and neuroinflammatory markers. Together, our findings establish PRMT8 as an important regulatory component of membrane phospholipid composition, short-term memory function, mitochondrial function, and neuroinflammation in response to hypoxic stress.
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Affiliation(s)
| | | | | | | | - Chuck T Chen
- National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD, USA
| | - HarLee E Possoit
- Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | | | | | - Jennifer I Brown
- Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Adam Frankel
- Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Hung Wen Lin
- Department of Cellular Biology & Anatomy.,Louisiana State University Health Sciences Center, Shreveport, LA, USA
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3
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Lee RHC, Wu CYC, Citadin CT, Couto E Silva A, Possoit HE, Clemons GA, Acosta CH, de la Llama VA, Neumann JT, Lin HW. Activation of Neuropeptide Y2 Receptor Can Inhibit Global Cerebral Ischemia-Induced Brain Injury. Neuromolecular Med 2021; 24:97-112. [PMID: 34019239 DOI: 10.1007/s12017-021-08665-z] [Citation(s) in RCA: 2] [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: 03/30/2021] [Accepted: 05/07/2021] [Indexed: 12/17/2022]
Abstract
Cardiopulmonary arrest (CA) can greatly impact a patient's life, causing long-term disability and death. Although multi-faceted treatment strategies against CA have improved survival rates, the prognosis of CA remains poor. We previously reported asphyxial cardiac arrest (ACA) can cause excessive activation of the sympathetic nervous system (SNS) in the brain, which contributes to cerebral blood flow (CBF) derangements such as hypoperfusion and, consequently, neurological deficits. Here, we report excessive activation of the SNS can cause enhanced neuropeptide Y levels. In fact, mRNA and protein levels of neuropeptide Y (NPY, a 36-amino acid neuropeptide) in the hippocampus were elevated after ACA-induced SNS activation, resulting in a reduced blood supply to the brain. Post-treatment with peptide YY3-36 (PYY3-36), a pre-synaptic NPY2 receptor agonist, after ACA inhibited NPY release and restored brain circulation. Moreover, PYY3-36 decreased neuroinflammatory cytokines, alleviated mitochondrial dysfunction, and improved neuronal survival and neurological outcomes. Overall, NPY is detrimental during/after ACA, but attenuation of NPY release via PYY3-36 affords neuroprotection. The consequences of PYY3-36 inhibit ACA-induced 1) hypoperfusion, 2) neuroinflammation, 3) mitochondrial dysfunction, 4) neuronal cell death, and 5) neurological deficits. The present study provides novel insights to further our understanding of NPY's role in ischemic brain injury.
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Affiliation(s)
- Reggie Hui-Chao Lee
- Department of Neurology, Louisiana State University Health Sciences Center, 1501 Kings Hwy, Shreveport, USA
| | - Celeste Yin-Chieh Wu
- Department of Neurology, Louisiana State University Health Sciences Center, 1501 Kings Hwy, Shreveport, USA
| | - Cristiane T Citadin
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, USA
| | - Alexandre Couto E Silva
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, USA
| | - Harlee E Possoit
- Department of Neurology, Louisiana State University Health Sciences Center, 1501 Kings Hwy, Shreveport, USA
| | - Garrett A Clemons
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, USA
| | - Christina H Acosta
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, USA
| | - Victoria A de la Llama
- Department of Neurology, Louisiana State University Health Sciences Center, 1501 Kings Hwy, Shreveport, USA
| | - Jake T Neumann
- Department of Biomedical Sciences, West Virginia School of Osteopathic Medicine, Lewisburg, USA
| | - Hung Wen Lin
- Department of Neurology, Louisiana State University Health Sciences Center, 1501 Kings Hwy, Shreveport, USA. .,Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, USA.
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Wu CYC, Couto E Silva A, Citadin CT, Clemons GA, Acosta CH, Knox BA, Grames MS, Rodgers KM, Lee RHC, Lin HW. Palmitic acid methyl ester inhibits cardiac arrest-induced neuroinflammation and mitochondrial dysfunction. Prostaglandins Leukot Essent Fatty Acids 2021; 165:102227. [PMID: 33445063 PMCID: PMC8174449 DOI: 10.1016/j.plefa.2020.102227] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 12/15/2020] [Accepted: 12/15/2020] [Indexed: 12/25/2022]
Abstract
We previously discovered that palmitic acid methyl ester (PAME) is a potent vasodilator released from the sympathetic ganglion with vasoactive properties. Post-treatment with PAME can enhance cortical cerebral blood flow and functional learning and memory, while inhibiting neuronal cell death in the CA1 region of the hippocampus under pathological conditions (i.e. cerebral ischemia). Since mechanisms underlying PAME-mediated neuroprotection remain unclear, we investigated the possible neuroprotective mechanisms of PAME after 6 min of asphyxial cardiac arrest (ACA, an animal model of global cerebral ischemia). Our results from capillary-based immunoassay (for the detection of proteins) and cytokine array suggest that PAME (0.02 mg/kg) can decrease neuroinflammatory markers, such as ionized calcium binding adaptor molecule 1 (Iba1, a specific marker for microglia/macrophage activation) and inflammatory cytokines after cardiopulmonary resuscitation. Additionally, the mitochondrial oxygen consumption rate (OCR) and respiratory function in the hippocampal slices were restored following ACA (via Seahorse XF24 Extracellular Flux Analyzer) suggesting that PAME can ameliorate mitochondrial dysfunction. Finally, hippocampal protein arginine methyltransferase 1 (PRMT1) and PRMT8 are enhanced in the presence of PAME to suggest a possible pathway of methylated fatty acids to modulate arginine-based enzymatic methylation. Altogether, our findings suggest that PAME can provide neuroprotection in the presence of ACA to alleviate neuroinflammation and ameliorate mitochondrial dysfunction.
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Affiliation(s)
- Celeste Yin-Chieh Wu
- Department of Neurology, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA.
| | - Alexandre Couto E Silva
- Department of Cellular Biology and Anatomy, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Cristiane T Citadin
- Department of Cellular Biology and Anatomy, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Garrett A Clemons
- Department of Cellular Biology and Anatomy, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Christina H Acosta
- Department of Cellular Biology and Anatomy, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Brianne A Knox
- Department of Neurology, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Mychal S Grames
- Department of Pharmacology, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Krista M Rodgers
- Department of Neurology, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA; Department of Cellular Biology and Anatomy, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Reggie Hui-Chao Lee
- Department of Neurology, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA; Department of Pharmacology, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Hung Wen Lin
- Department of Neurology, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA; Department of Cellular Biology and Anatomy, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA; Department of Pharmacology, Toxicology & Neuroscience Louisiana State University Health Sciences Center, Shreveport, LA, USA
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Lee RHC, Grames MS, Wu CYC, Lien CF, Couto E Silva A, Possoit HE, Clemons GA, Citadin CT, Neumann JT, Pastore D, Lauro D, Della-Morte D, Lin HW. Upregulation of serum and glucocorticoid-regulated kinase 1 exacerbates brain injury and neurological deficits after cardiac arrest. Am J Physiol Heart Circ Physiol 2020; 319:H1044-H1050. [PMID: 32946263 DOI: 10.1152/ajpheart.00399.2020] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Cardiopulmonary arrest (CA) is the leading cause of death and disability in the United States. CA-induced brain injury is influenced by multifactorial processes, including reduced cerebral blood flow (hypoperfusion) and neuroinflammation, which can lead to neuronal cell death and functional deficits. We have identified serum and glucocorticoid-regulated kinase-1 (SGK1) as a new target in brain ischemia previously described in the heart, liver, and kidneys (i.e., diabetes and hypertension). Our data suggest brain SGK1 mRNA and protein expression (i.e., hippocampus), presented with hypoperfusion (low cerebral blood flow) and neuroinflammation, leading to further studies of the potential role of SGK1 in CA-induced brain injury. We used a 6-min asphyxia cardiac arrest (ACA) rat model to induce global cerebral ischemia. Modulation of SGK1 was implemented via GSK650394, a SGK1-specific inhibitor (1.2 μg/kg icv). Accordingly, treatment with GSK650394 attenuated cortical hypoperfusion and neuroinflammation (via Iba1 expression) after ACA, whereas neuronal survival was enhanced in the CA1 region of the hippocampus. Learning/memory deficits were observed 3 days after ACA but ameliorated with GSK650394. In conclusion, SGK1 is a major contributor to ACA-induced brain injury and neurological deficits, while inhibition of SGK1 with GSK650394 provided neuroprotection against CA-induced hypoperfusion, neuroinflammation, neuronal cell death, and learning/memory deficits. Our studies could lead to a novel, therapeutic target for alleviating brain injury following cerebral ischemia.NEW & NOTEWORTHY Upregulation of SGK1 exacerbates brain injury during cerebral ischemia. Inhibition of SGK1 affords neuroprotection against cardiac arrest-induced hypoperfusion, neuroinflammation, neuronal cell death, and neurological deficits.
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Affiliation(s)
- Reggie Hui-Chao Lee
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana.,Department of Pharmacology, Toxicology, and Neuroscience, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - Mychal S Grames
- Department of Pharmacology, Toxicology, and Neuroscience, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - Celeste Yin-Chieh Wu
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - Chih-Feng Lien
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - Alexandre Couto E Silva
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - HarLee E Possoit
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - Garrett A Clemons
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - Cristiane T Citadin
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - Jake T Neumann
- Department of Biomedical Sciences, West Virginia School of Osteopathic Medicine, Lewisburg, West Virginia
| | - Donatella Pastore
- Department of Systems Medicine, University of Rome Tor Vergata, Rome. Italy
| | - Davide Lauro
- Department of Systems Medicine, University of Rome Tor Vergata, Rome. Italy
| | - David Della-Morte
- Department of Systems Medicine, University of Rome Tor Vergata, Rome. Italy.,Department of Human Sciences and Quality of Life Promotion, San Raffaele Roma Open University, Rome. Italy.,Department of Neurology and Evelyn F. McKnight Brain Institute, Miller School of Medicine, University of Miami, Miami, Florida
| | - Hung Wen Lin
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana.,Department of Pharmacology, Toxicology, and Neuroscience, Louisiana State University Health Sciences Center, Shreveport, Louisiana.,Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, Louisiana
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6
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Chen PY, Wu CYC, Clemons GA, Citadin CT, Couto E Silva A, Possoit HE, Azizbayeva R, Forren NE, Liu CH, Rao KNS, Krzywanski DM, Lee RHC, Neumann JT, Lin HW. Stearic acid methyl ester affords neuroprotection and improves functional outcomes after cardiac arrest. Prostaglandins Leukot Essent Fatty Acids 2020; 159:102138. [PMID: 32663656 DOI: 10.1016/j.plefa.2020.102138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 05/14/2020] [Indexed: 11/16/2022]
Abstract
Cardiac arrest causes neuronal damage and functional impairments that can result in learning/memory dysfunction after ischemia. We previously identified a saturated fatty acid (stearic acid methyl ester, SAME) that was released from the superior cervical ganglion (sympathetic ganglion). The function of stearic acid methyl ester is currently unknown. Here, we show that SAME can inhibit the detrimental effects of global cerebral ischemia (i.e. cardiac arrest). Treatment with SAME in the presence of asphyxial cardiac arrest (ACA) revived learning and working memory deficits. Similarly, SAME-treated hippocampal slices after oxygen-glucose deprivation inhibited neuronal cell death. Moreover, SAME afforded neuroprotection against ACA in the CA1 region of the hippocampus, reduced ionized calcium-binding adapter molecule 1 expression and inflammatory cytokines/chemokines, with restoration in mitochondria respiration. Altogether, we describe a unique and uncharted role of saturated fatty acids in the brain that may have important implications against cerebral ischemia.
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Affiliation(s)
- Po-Yi Chen
- Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA; Department of Neurology, Louisiana State University, Health Sciences Center, Shreveport, LA; Cardiovascular Research Center, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan; Department of Medical Research, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan; PhD. Programs in Pharmacology and Toxicology, College of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Celeste Yin-Chieh Wu
- Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA; Department of Neurology, Louisiana State University, Health Sciences Center, Shreveport, LA
| | - Garrett A Clemons
- Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA; Department of Cellular Biology and Anatomy, Louisiana State University, Health Sciences Center, Shreveport, LA
| | - Cristiane T Citadin
- Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA; Department of Cellular Biology and Anatomy, Louisiana State University, Health Sciences Center, Shreveport, LA
| | - Alexandre Couto E Silva
- Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA; Department of Cellular Biology and Anatomy, Louisiana State University, Health Sciences Center, Shreveport, LA
| | - Harlee E Possoit
- Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA; Department of Neurology, Louisiana State University, Health Sciences Center, Shreveport, LA
| | - Rinata Azizbayeva
- Department of Biomedical Science, West Virginia University School of Osteopathic Medicine, Lewisburg, WV
| | - Nathan E Forren
- Department of Biomedical Science, West Virginia University School of Osteopathic Medicine, Lewisburg, WV
| | - Chin-Hung Liu
- Cardiovascular Research Center, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan; PhD. Programs in Pharmacology and Toxicology, College of Medicine, Tzu Chi University, Hualien, Taiwan
| | - K N Shashanka Rao
- Department of Cellular Biology and Anatomy, Louisiana State University, Health Sciences Center, Shreveport, LA
| | - David M Krzywanski
- Department of Cellular Biology and Anatomy, Louisiana State University, Health Sciences Center, Shreveport, LA
| | - Reggie Hui-Chao Lee
- Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA; Department of Neurology, Louisiana State University, Health Sciences Center, Shreveport, LA
| | - Jake T Neumann
- Department of Biomedical Science, West Virginia University School of Osteopathic Medicine, Lewisburg, WV
| | - Hung Wen Lin
- Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA; Department of Cellular Biology and Anatomy, Louisiana State University, Health Sciences Center, Shreveport, LA; Department of Neurology, Louisiana State University, Health Sciences Center, Shreveport, LA.
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Lee RHC, Couto E Silva A, Possoit HE, Lerner FM, Chen PY, Azizbayeva R, Citadin CT, Wu CYC, Neumann JT, Lin HW. Palmitic acid methyl ester is a novel neuroprotective agent against cardiac arrest. Prostaglandins Leukot Essent Fatty Acids 2019; 147:6-14. [PMID: 30514597 PMCID: PMC6533160 DOI: 10.1016/j.plefa.2018.11.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 11/21/2018] [Accepted: 11/22/2018] [Indexed: 01/13/2023]
Abstract
We previously discovered that palmitic acid methyl ester (PAME) is a potent vasodilator first identified and released from the superior cervical ganglion and remain understudied. Thus, we investigated PAME's role in modulating cerebral blood flow (CBF) and neuroprotection after 6 min of cardiac arrest (model of global cerebral ischemia). Our results suggest that PAME can enhance CBF under normal physiological conditions, while administration of PAME (0.02 mg/kg) immediately after cardiopulmonary resuscitation can also enhance CBF in vivo. Additionally, functional learning and spatial memory assessments (via T-maze) 3 days after asphyxial cardiac arrest (ACA) suggest that PAME-treated rats have improved learning and memory recovery versus ACA alone. Furthermore, improved neuronal survival in the CA1 region of the hippocampus were observed in PAME-treated, ACA-induced rats. Altogether, our findings suggest that PAME can enhance CBF, alleviate neuronal cell death, and promote functional outcomes in the presence of ACA.
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Affiliation(s)
- Reggie Hui-Chao Lee
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, LA, USA; Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Alexandre Couto E Silva
- Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA, USA; Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - HarLee E Possoit
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, LA, USA; Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Francesca M Lerner
- Department of Neurology, Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Po-Yi Chen
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, LA, USA; Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA, USA; Department of Pharmacology and Toxicology, Tzu Chi University, Hualien, Taiwan
| | - Rinata Azizbayeva
- Department of Biomedical Sciences, West Virginia School of Osteopathic Medicine, Lewisburg, WV, USA
| | - Cristiane T Citadin
- Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA, USA; Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Celeste Yin-Chieh Wu
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, LA, USA; Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Jake T Neumann
- Department of Biomedical Sciences, West Virginia School of Osteopathic Medicine, Lewisburg, WV, USA
| | - Hung Wen Lin
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, LA, USA; Center for Brain Health, Louisiana State University Health Sciences Center, Shreveport, LA, USA; Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA, USA.
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Wu CYC, Lerner FM, Couto E Silva A, Possoit HE, Hsieh TH, Neumann JT, Minagar A, Lin HW, Lee RHC. Utilizing the Modified T-Maze to Assess Functional Memory Outcomes After Cardiac Arrest. J Vis Exp 2018:56694. [PMID: 29364254 PMCID: PMC5908446 DOI: 10.3791/56694] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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] [Indexed: 03/15/2024] Open
Abstract
BACKGROUND Evaluating mild to moderate cognitive impairment in a global cerebral ischemia (i.e. cardiac arrest) model can be difficult due to poor locomotion after surgery. For example, rats who undergo surgical procedures and are subjected to the Morris water maze may not be able to swim, thus voiding the experiment. New Method: We established a modified behavioral spontaneous alternation T-maze test. The major advantage of the modified T-maze protocol is its relatively simple design that is powerful enough to assess functional learning/memory after ischemia. Additionally, the data analysis is simple and straightforward. We used the T-maze to determine the rats' learning/memory deficits both in the presence or absence of mild to moderate (6 min) asphyxial cardiac arrest (ACA). Rats have a natural tendency for exploration and will explore the alternate arms in the T-maze, whereas hippocampal-lesioned rats tend to adopt a side-preference resulting in decreased spontaneous alternation ratios, revealing the hippocampal-related functional learning/memory in the presence or absence of ACA. RESULTS ACA groups have higher side-preference ratios and lower alternations as compared to control. Comparison with Existing Method(s): The Morris water and Barnes maze are more prominent for assessing learning/memory function. However, the Morris water maze is more stressful than other mazes. The Barnes maze is widely used to measure reference (long-term) memory, while ACA-induced neurocognitive deficits are more closely related to working (short-term) memory. CONCLUSIONS We have developed a simple, yet effective strategy to delineate working (short-term) memory via the T-maze in our global cerebral ischemia model (ACA).
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Affiliation(s)
- Celeste Y C Wu
- Department of Neurology, Louisiana State University Health Science Center; Center for Brain Health, Louisiana State University Health Science Center
| | - Francesca M Lerner
- Department of Neurology, Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine
| | - Alexandre Couto E Silva
- Department of Cellular Biology and Anatomy, Louisiana State University Health Science Center
| | - Harlee E Possoit
- Department of Neurology, Louisiana State University Health Science Center; Center for Brain Health, Louisiana State University Health Science Center
| | - Tsung-Han Hsieh
- Department of Neurology, Louisiana State University Health Science Center; Center for Brain Health, Louisiana State University Health Science Center
| | - Jake T Neumann
- Department of Biomedical Sciences, West Virginia School of Osteopathic Medicine
| | - Alireza Minagar
- Department of Neurology, Louisiana State University Health Science Center
| | - Hung Wen Lin
- Department of Neurology, Louisiana State University Health Science Center; Center for Brain Health, Louisiana State University Health Science Center; Department of Cellular Biology and Anatomy, Louisiana State University Health Science Center
| | - Reggie H C Lee
- Department of Neurology, Louisiana State University Health Science Center; Center for Brain Health, Louisiana State University Health Science Center;
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Lee RH, Couto E Silva A, Lerner FM, Wilkins CS, Valido SE, Klein DD, Wu CY, Neumann JT, Della-Morte D, Koslow SH, Minagar A, Lin HW. Interruption of perivascular sympathetic nerves of cerebral arteries offers neuroprotection against ischemia. Am J Physiol Heart Circ Physiol 2016; 312:H182-H188. [PMID: 27864234 DOI: 10.1152/ajpheart.00482.2016] [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] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 11/11/2016] [Accepted: 11/16/2016] [Indexed: 11/22/2022]
Abstract
Sympathetic nervous system activity is increased after cardiopulmonary arrest, resulting in vasoconstrictor release from the perivascular sympathetic nerves of cerebral arteries. However, the pathophysiological function of the perivascular sympathetic nerves in the ischemic brain remains unclear. A rat model of global cerebral ischemia (asphyxial cardiac arrest, ACA) was used to investigate perivascular sympathetic nerves of cerebral arteries via bilateral decentralization (preganglionic lesion) of the superior cervical ganglion (SCG). Decentralization of the SCG 5 days before ACA alleviated hypoperfusion and afforded hippocampal neuroprotection and improved functional outcomes. These studies can provide further insights into the functional mechanism(s) of the sympathetic nervous system during ischemia. NEW & NOTEWORTHY Interruption of the perivascular sympathetic nerves can alleviate CA-induced hypoperfusion and neuronal cell death in the CA1 region of the hippocampus to enhance functional learning and memory.
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Affiliation(s)
- Reggie H Lee
- Cerebral Vascular Disease Laboratories, University of Miami Miller School of Medicine, Miami, Florida.,Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida.,Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - Alexandre Couto E Silva
- Cerebral Vascular Disease Laboratories, University of Miami Miller School of Medicine, Miami, Florida.,Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida.,Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - Francesca M Lerner
- Cerebral Vascular Disease Laboratories, University of Miami Miller School of Medicine, Miami, Florida.,Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida
| | - Carl S Wilkins
- Florida International University Herbert Wertheim College of Medicine, Miami, Florida
| | - Stephen E Valido
- Cerebral Vascular Disease Laboratories, University of Miami Miller School of Medicine, Miami, Florida.,Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida
| | - Daniel D Klein
- Cerebral Vascular Disease Laboratories, University of Miami Miller School of Medicine, Miami, Florida.,Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida
| | - Celeste Y Wu
- Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida.,Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - Jake T Neumann
- Department of Biomedical Sciences, West Virginia School of Osteopathic Medicine, Lewisburg, West Virginia
| | - David Della-Morte
- Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida.,Department of Systems Medicine, University of Rome Tor Vergata; and.,IRCCS San Raffaele Pisana, Rome, Italy
| | - Stephen H Koslow
- Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, Florida
| | - Alireza Minagar
- Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana
| | - Hung Wen Lin
- Cerebral Vascular Disease Laboratories, University of Miami Miller School of Medicine, Miami, Florida; .,Department of Neurology, University of Miami Miller School of Medicine, Miami, Florida.,Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana
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