1
|
Wang J, Li Q, Chu S, Liu X, Zhang J, He W. Impact of Codonopsis decoction on cerebral blood flow and cognitive function in rats with chronic cerebral ischemia. JOURNAL OF ETHNOPHARMACOLOGY 2024; 323:117585. [PMID: 38159825 DOI: 10.1016/j.jep.2023.117585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 12/06/2023] [Accepted: 12/11/2023] [Indexed: 01/03/2024]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Some species of Codonopsis (local name in Shanxi: Ludang) have long demonstrated high medicinal and economic value. Radix Codonopsis, the dried root of Codonopsis pilosula (Franch.) Nannf. (C. pilosula), Codonopsis pilosula var. modesta (Nannf.) L.D.Shen (C. pilosula var. modesta), or Codonopsis pilosula subsp. tangshen (Oliv.) D.Y.Hong (C. pilosula subsp. tangshen), was recorded as a traditional Chinese medicine back in the Qing Dynasty in Ben Cao Cong Xin. Radix Codonopsis, a valuable medicinal herb certified by the Chinese National Geographic Indication, is known for invigorating the spleen, nourishing the lungs, promoting blood circulation, and generating fluid properties. Given that chronic cerebral ischemia (CCI) is often associated with the symptoms of qi and blood deficiencies and fluid depletion, we explored the potential of Codonopsis decoction in the treatment of CCI. STUDY AIMS We investigated the effects of Codonopsis decoction on cerebral blood flow (CBF) and cognitive function in rats with bilateral carotid artery occlusion after surgery; explored whether Codonopsis decoction alleviates pathological injuries in brain tissue of rats after 2-VO surgery; and assessed the impact of Codonopsis decoction on the expression of chemokines, hypoxia-inducible factors, and inflammatory mediators in rats after 2-VO surgery. MATERIALS AND METHODS We used a 2-VO rat model to simulate CCI. We used a laser speckle imaging (LSI) system to observe changes in CBF before and after surgery. The goal was to examine variations in CBF at different time points after 2-VO surgery. For 4 weeks, the rats were orally administered Codonopsis decoction at doses of 2.7, 5.4, and 10.8 g/kg/day, or Ginaton at a dose of 43.2 mg/kg/day. To assess the effect of Codonopsis on cerebral hypoperfusion symptoms in rats, we conducted the Morris water maze (MWM), Barnes maze (BM), and forelimb grip strength tests. Additionally, pathological experiments including hematoxylin and eosin, Nissl, and Luxol fast blue staining were conducted. Furthermore, we used western blotting to detect changes in the levels of proteins such as the chemotactic factor CKLF1 and hypoxia-inducible actor 1-alpha (HIF-1α). RESULTS One week after 2-VO surgery, cerebral arterial blood supply in the rats rapidly reduced to approximately 43.39% ± 3.53% of the preoperative level. Cerebral cortex perfusion reached its nadir within 24 h of surgery, gradually recovering and stabilizing by the fourth week after surgery. An integration of the results from the BM, MWM, and grip strength tests, which assessed cognitive function and forelimb strength in rats after 2-VO surgery, unequivocally revealed that Codonopsis treatment significantly reduced the latency period and increased the number of platform crossings in the MWM test. Ginaton exhibited a comparable effect. Moreover, both Codonopsis and Ginaton decreased the number of errors and the time required to locate the target hole in the BM test. Histopathological staining revealed that Codonopsis and Ginaton could ameliorate pathological damage in rats after CCI and reduce the release of factors such as CKLF1 and HIF-1α. CONCLUSION Codonopsis decoction exerted its protective effects on CCI rats possibly by modulating the levels of chemokines, hypoxia-inducible factors, and neuroinflammatory mediators.
Collapse
Affiliation(s)
- Jie Wang
- Shanxi Key Laboratory of Chinese Medicine Encephalopathy, Shanxi University of Chinese Medicine, Jinzhong, 030619, Shanxi, China; College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, 250000, Shandong, China
| | - Qinqing Li
- Shanxi Key Laboratory of Chinese Medicine Encephalopathy, Shanxi University of Chinese Medicine, Jinzhong, 030619, Shanxi, China
| | - Shifeng Chu
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica & Neuroscience Center, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, 100050, China
| | - Xin Liu
- Shanxi Key Laboratory of Chinese Medicine Encephalopathy, Shanxi University of Chinese Medicine, Jinzhong, 030619, Shanxi, China
| | - Junlong Zhang
- Shanxi Key Laboratory of Chinese Medicine Encephalopathy, Shanxi University of Chinese Medicine, Jinzhong, 030619, Shanxi, China; College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, 250000, Shandong, China.
| | - Wenbin He
- Shanxi Key Laboratory of Chinese Medicine Encephalopathy, Shanxi University of Chinese Medicine, Jinzhong, 030619, Shanxi, China.
| |
Collapse
|
2
|
Rajeev V, Chai YL, Poh L, Selvaraji S, Fann DY, Jo DG, De Silva TM, Drummond GR, Sobey CG, Arumugam TV, Chen CP, Lai MKP. Chronic cerebral hypoperfusion: a critical feature in unravelling the etiology of vascular cognitive impairment. Acta Neuropathol Commun 2023; 11:93. [PMID: 37309012 DOI: 10.1186/s40478-023-01590-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Accepted: 05/25/2023] [Indexed: 06/14/2023] Open
Abstract
Vascular cognitive impairment (VCI) describes a wide spectrum of cognitive deficits related to cerebrovascular diseases. Although the loss of blood flow to cortical regions critically involved in cognitive processes must feature as the main driver of VCI, the underlying mechanisms and interactions with related disease processes remain to be fully elucidated. Recent clinical studies of cerebral blood flow measurements have supported the role of chronic cerebral hypoperfusion (CCH) as a major driver of the vascular pathology and clinical manifestations of VCI. Here we review the pathophysiological mechanisms as well as neuropathological changes of CCH. Potential interventional strategies for VCI are also reviewed. A deeper understanding of how CCH can lead to accumulation of VCI-associated pathology could potentially pave the way for early detection and development of disease-modifying therapies, thus allowing preventive interventions instead of symptomatic treatments.
Collapse
Affiliation(s)
- Vismitha Rajeev
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Memory Aging and Cognition Centre, National University Health System, Singapore, Singapore
| | - Yuek Ling Chai
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Memory Aging and Cognition Centre, National University Health System, Singapore, Singapore
| | - Luting Poh
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Memory Aging and Cognition Centre, National University Health System, Singapore, Singapore
| | - Sharmelee Selvaraji
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Memory Aging and Cognition Centre, National University Health System, Singapore, Singapore
- Integrative Sciences and Engineering Programme, NUS Graduate School, National University of Singapore, Singapore, Singapore
| | - David Y Fann
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Dong-Gyu Jo
- School of Pharmacy, Sungkyunkwan University, Suwon, Republic of Korea
| | - T Michael De Silva
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Bundoora, Victoria, Australia
| | - Grant R Drummond
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Bundoora, Victoria, Australia
| | - Christopher G Sobey
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Bundoora, Victoria, Australia
| | - Thiruma V Arumugam
- School of Pharmacy, Sungkyunkwan University, Suwon, Republic of Korea
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Bundoora, Victoria, Australia
| | - Christopher P Chen
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Memory Aging and Cognition Centre, National University Health System, Singapore, Singapore
- NUS Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Mitchell K P Lai
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
- Memory Aging and Cognition Centre, National University Health System, Singapore, Singapore.
- NUS Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
| |
Collapse
|
3
|
Yang LJ, Wu W, Jiang WR, Zhu CL, Yao ZH. Upregulation of RasGRF1 ameliorates spatial cognitive dysfunction in mice after chronic cerebral hypoperfusion. Aging (Albany NY) 2023; 15:2999-3020. [PMID: 37053022 DOI: 10.18632/aging.204654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 03/31/2023] [Indexed: 04/14/2023]
Abstract
Chronic cerebral hypoperfusion (CCH)-mediated cognitive impairment is a serious problem worldwide. However, given its complexity, the underlying mechanisms by which CCH induces cognitive dysfunction remain unclear, resulting in a lack of effective treatments. In this study, we aimed to determine whether changes in the expression of RasGRF1, an important protein associated with cognition and synaptic plasticity, underlie the associated impairments in cognition after CCH. We found that RasGRF1 levels markedly decreased following CCH. Through prediction and validation studies, we observed that miRNA-323-3p was upregulated after CCH and could bind to the 3'-untranslated region of Rasgrf1 mRNA and regulate its expression in vitro. Moreover, the inhibition of miRNA-323-3p upregulated Rasgrf1 expression in the hippocampus after CCH, which was reversed by Rasgrf1 siRNA. This suggests that miRNA-323-3p is an important regulator of Rasgrf1. The Morris water maze and Y maze tests showed that miRNA-323-3p inhibition and Rasgrf1 upregulation improved spatial learning and memory, and electrophysiological measurements revealed deficits in long-term potentiation after CCH that were reversed by Rasgrf1 upregulation. Dendritic spine density and mature mushroom spine density were also improved after miRNA-323-3p inhibition and Rasgrf1 upregulation. Furthermore, Rasgrf1 upregulation by miRNA-323-3p inhibition improved dendritic spine density and mature mushroom spine density and ameliorated the deterioration of synapses and postsynaptic density. Overall, RasGRF1 regulation attenuated cognitive impairment, helped maintain structural and functional synaptic plasticity, and prevented synapse deterioration after CCH. These results suggest that Rasgrf1 downregulation by miRNA-323-3p plays an important role in cognitive impairment after CCH. Thus, RasGRF1 and miRNA-323-3p may represent potential therapeutic targets for cognitive impairment after CCH.
Collapse
Affiliation(s)
- Li-Jie Yang
- Department of Geriatrics, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Wei Wu
- Department of Clinical Laboratory, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Wan-Rong Jiang
- Department of Geriatrics, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Cheng-Liang Zhu
- Department of Clinical Laboratory, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Zhao-Hui Yao
- Department of Geriatrics, Renmin Hospital of Wuhan University, Wuhan 430060, China
| |
Collapse
|
4
|
Martínez-Iglesias O, Carrera I, Carril JC, Fernández-Novoa L, Cacabelos N, Cacabelos R. DNA Methylation in Neurodegenerative and Cerebrovascular Disorders. Int J Mol Sci 2020; 21:ijms21062220. [PMID: 32210102 PMCID: PMC7139499 DOI: 10.3390/ijms21062220] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/18/2020] [Accepted: 03/18/2020] [Indexed: 02/08/2023] Open
Abstract
DNA methylation is an epigenetic mechanism by which methyl groups are added to DNA, playing a crucial role in gene expression regulation. The aim of the present study is to compare methylation status of healthy subjects with that of patients with Alzheimer’s, Parkinson’s or Cerebrovascular diseases. We also analyze methylation status of a transgenic Alzheimer’s disease mouse model (3xTg-AD). Our results show that both global methylation (n = 141) and hydroxymethylation (n = 131) levels are reduced in DNA samples from buffy coats of patients with neurodegenerative disorders and age-related cerebrovascular disease. The importance of methylation and hydroxymethylation reduction is stressed by the finding that DNMT3a mRNA levels are also downregulated in buffy coats of patients with Dementia (n = 25). Global methylation is also reduced in brain, liver and serum samples of 3xTg-AD vs. wild type mice, such as DNMT3a mRNA levels that are also decreased in the brain of 3xTg-AD (n = 10). These results suggest that the use of global methylation and hydroxymethylation levels, together with the study of DNMT3a expression, could be useful as a new diagnostic biomarker for these prevalent disorders.
Collapse
|
5
|
Braun DJ, Abner E, Bakshi V, Goulding DS, Grau EM, Lin AL, Norris CM, Sudduth TL, Webster SJ, Wilcock DM, Van Eldik LJ. Blood Flow Deficits and Cerebrovascular Changes in a Dietary Model of Hyperhomocysteinemia. ASN Neuro 2019; 11:1759091419865788. [PMID: 31362539 PMCID: PMC6668175 DOI: 10.1177/1759091419865788] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/20/2019] [Accepted: 06/21/2019] [Indexed: 12/19/2022] Open
Abstract
Elevated homocysteine in the blood, or hyperhomocysteinemia, is a recognized risk factor for multiple causes of dementia including Alzheimer’s disease. While reduction of homocysteine levels can generally be accomplished in a straightforward manner, the evidence regarding the cognitive benefits of this approach is less clear. To identify adjunct therapeutic targets that might more effectively restore cognition, the present series of experiments characterizes early and later cerebrovascular changes in a model of hyperhomocysteinemia. Sex-balanced groups of adult C57BL/6J mice were administered a diet deficient in vitamins B6, B12, and B9 (folate) and supplemented with excess methionine. They were subsequently assessed for changes in cerebral blood flow, memory, blood–brain barrier permeability, and selected vascular-associated genes. Blood flow deficits and barrier permeability changes occurred alongside changes in memory and in genes associated with metabolism, endothelial nitric oxide signaling, barrier integrity, and extracellular matrix remodeling. Significant sexually dimorphic responses to the diet were also detected. Taken together, these data deepen our understanding of a major contributor to dementia burden.
Collapse
Affiliation(s)
- David J. Braun
- Sanders-Brown Center on Aging, University of Kentucky, Lexington KY, USA
| | - Erin Abner
- Sanders-Brown Center on Aging, University of Kentucky, Lexington KY, USA
- Department of Epidemiology, University of Kentucky, Lexington KY, USA
| | - Vikas Bakshi
- Sanders-Brown Center on Aging, University of Kentucky, Lexington KY, USA
| | | | - Elizabeth M. Grau
- Sanders-Brown Center on Aging, University of Kentucky, Lexington KY, USA
| | - Ai-Ling Lin
- Sanders-Brown Center on Aging, University of Kentucky, Lexington KY, USA
- Department of Pharmacology & Nutritional Sciences, University of Kentucky, Lexington KY, USA
| | - Christopher M. Norris
- Sanders-Brown Center on Aging, University of Kentucky, Lexington KY, USA
- Department of Pharmacology & Nutritional Sciences, University of Kentucky, Lexington KY, USA
| | - Tiffany L. Sudduth
- Sanders-Brown Center on Aging, University of Kentucky, Lexington KY, USA
| | - Scott J. Webster
- Sanders-Brown Center on Aging, University of Kentucky, Lexington KY, USA
| | - Donna M. Wilcock
- Sanders-Brown Center on Aging, University of Kentucky, Lexington KY, USA
- Department of Physiology, University of Kentucky, Lexington KY, USA
| | - Linda J. Van Eldik
- Sanders-Brown Center on Aging, University of Kentucky, Lexington KY, USA
- Department of Neuroscience, University of Kentucky, Lexington KY, USA
- Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington KY, USA
| |
Collapse
|
6
|
Momany AM, Kamradt JM, Nikolas MA. A Meta-Analysis of the Association Between Birth Weight and Attention Deficit Hyperactivity Disorder. JOURNAL OF ABNORMAL CHILD PSYCHOLOGY 2018; 46:1409-1426. [PMID: 29159441 PMCID: PMC5962386 DOI: 10.1007/s10802-017-0371-9] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A large body of work has investigated the association between birth weight and ADHD and has resulted in mixed findings with regard to the direction and magnitude of this association. Despite the vast amount of research on this topic, a comprehensive and systematic quantification of the association between birth weight and ADHD has yet to be undertaken. A meta-analysis of 88 unique studies (N = 4,645,482) was conducted to quantify the overall effect size of birth weight on ADHD symptoms. Several variables were examined as moderators that may contribute to systematic variation in effect sizes. Overall, birth weight was found to have a small, but significant, association with ADHD symptoms such that individuals born at lower birth weights manifested greater symptoms of ADHD (r = -0.15). Sample type, mean birth weight of the sample, geographic region, the informant of ADHD symptoms, ADHD symptom measurement method, and race were all found to contribute significantly to heterogeneity in effect sizes. Notably, several early life risk factors previously found to be associated with both ADHD and birth weight, gestational age and prenatal smoking exposure, were not found to contribute to heterogeneity in effect sizes. The findings of the current analyses align with the growing recognition that early life adversity contributes to neurodevelopmental difficulties, and the findings highlight the importance of a better understanding of the mechanisms underlying the association between early life risk factors and adverse neurodevelopmental sequela, such as that observed in ADHD.
Collapse
Affiliation(s)
- Allison M Momany
- Department of Psychological and Brain Sciences, University of Iowa, E11 Seashore Hall, Iowa City, IA, 52242, USA.
| | - Jaclyn M Kamradt
- Department of Psychological and Brain Sciences, University of Iowa, E11 Seashore Hall, Iowa City, IA, 52242, USA
| | - Molly A Nikolas
- Department of Psychological and Brain Sciences, University of Iowa, E11 Seashore Hall, Iowa City, IA, 52242, USA
| |
Collapse
|
7
|
Vetrovoy OV, Glushchenko TS, Sarieva KV, Tyulkova EI, Aramisova RM, Samoilov MO. The Acetylation of Histone H3 at Lys24 Is Accompanied by Delayed Expression of Neuroprotective Proteins Bcl-2 and BDNF in the Neocortex of Rats Exposed to Severe Hypoxia: the Effect of Postconditioning. NEUROCHEM J+ 2018. [DOI: 10.1134/s1819712418030157] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
8
|
Samoilov M, Churilova A, Gluschenko T, Vetrovoy O, Dyuzhikova N, Rybnikova E. Acetylation of histones in neocortex and hippocampus of rats exposed to different modes of hypobaric hypoxia: Implications for brain hypoxic injury and tolerance. Acta Histochem 2016; 118:80-9. [PMID: 26643215 DOI: 10.1016/j.acthis.2015.11.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 11/14/2015] [Accepted: 11/16/2015] [Indexed: 12/26/2022]
Abstract
Acetylation of nucleosome histones results in relaxation of DNA and its availability for the transcriptional regulators, and is generally associated with the enhancement of gene expression. Although it is well known that activation of a variety of pro-adaptive genes represents a key event in the development of brain hypoxic/ischemic tolerance, the role of epigenetic mechanisms, in particular histone acetylation, in this process is still unexplored. The aim of the present study was to investigate changes in acetylation of histones in vulnerable brain neurons using original well-standardized model of hypobaric hypoxia and preconditioning-induced tolerance of the brain. Using quantitative immunohistochemistry and Western blot, effects of severe injurious hypobaric hypoxia (SH, 180mm Hg, 3h) and neuroprotective preconditioning mode (three episodes of 360mm Hg for 2h spaced at 24h) on the levels of the acetylated proteins and acetylated H3 Lys24 (H3K24ac) in the neocortex and hippocampus of rats were studied. SH caused global repression of the acetylation processes in the neocortex (layers II-III, V) and hippocampus (CA1, CA3) by 3-24h, and this effect was prevented by the preconditioning. Moreover, hypoxic preconditioning remarkably increased the acetylation of H3K24 in response to SH in the brain areas examined. The preconditioning hypoxia without subsequent SH also stimulated acetylation processes in the neocortex and hippocampus. The moderately enhanced expression of the acetylated proteins in the preconditioned rats was maintained for 24h, whereas acetylation of H3K24 was intense but transient, peaked at 3h. The novel data obtained in the present study indicate that large activation of the acetylation processes, in particular acetylation of histones might be essential for the development of brain hypoxic tolerance.
Collapse
Affiliation(s)
- Mikhail Samoilov
- Laboratory of Regulation of Brain Neuron Functions, Pavlov Institute of Physiology, Russian Academy of Sciences, Makarova nab. 6, 199034 St. Petersburg, Russian Federation
| | - Anna Churilova
- Laboratory of Regulation of Brain Neuron Functions, Pavlov Institute of Physiology, Russian Academy of Sciences, Makarova nab. 6, 199034 St. Petersburg, Russian Federation
| | - Tatjana Gluschenko
- Laboratory of Regulation of Brain Neuron Functions, Pavlov Institute of Physiology, Russian Academy of Sciences, Makarova nab. 6, 199034 St. Petersburg, Russian Federation
| | - Oleg Vetrovoy
- Laboratory of Regulation of Brain Neuron Functions, Pavlov Institute of Physiology, Russian Academy of Sciences, Makarova nab. 6, 199034 St. Petersburg, Russian Federation; Department of Biochemistry, Faculty of Biology, St. Petersburg State University, 7-9, Universitetskaya nab., 199034 St. Petersburg, Russian Federation
| | - Natalia Dyuzhikova
- Laboratory of Genetics of High Nervous Activity, Pavlov Institute of Physiology, Russian Academy of Sciences, Makarova nab. 6, 199034 St. Petersburg, Russian Federation
| | - Elena Rybnikova
- Laboratory of Neuroendocrinology, Pavlov Institute of Physiology, Russian Academy of Sciences, Makarova nab. 6, 199034 St. Petersburg, Russian Federation.
| |
Collapse
|
9
|
Pre- and Perinatal Ischemia-Hypoxia, the Ischemia-Hypoxia Response Pathway, and ADHD Risk. Behav Genet 2016; 46:467-77. [DOI: 10.1007/s10519-016-9784-4] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Accepted: 02/10/2016] [Indexed: 02/06/2023]
|
10
|
Sandt C, Nadaradjane C, Richards R, Dumas P, Sée V. Use of infrared microspectroscopy to elucidate a specific chemical signature associated with hypoxia levels found in glioblastoma. Analyst 2016; 141:870-83. [DOI: 10.1039/c5an02112j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Detection of the chemical signature associated with hypoxia in single glioblastoma cells by synchrotron infrared microspectroscopy.
Collapse
Affiliation(s)
- Christophe Sandt
- Synchrotron SOLEIL
- L'Orme des Merisiers
- 91192 Gif sur Yvette
- France
| | - Céline Nadaradjane
- Synchrotron SOLEIL
- L'Orme des Merisiers
- 91192 Gif sur Yvette
- France
- Department of Biochemistry
| | - Rosalie Richards
- Department of Biochemistry
- Institute of Integrative Biology
- University of Liverpool
- Liverpool
- UK
| | - Paul Dumas
- Synchrotron SOLEIL
- L'Orme des Merisiers
- 91192 Gif sur Yvette
- France
| | - Violaine Sée
- Department of Biochemistry
- Institute of Integrative Biology
- University of Liverpool
- Liverpool
- UK
| |
Collapse
|
11
|
Rybnikova E, Samoilov M. Current insights into the molecular mechanisms of hypoxic pre- and postconditioning using hypobaric hypoxia. Front Neurosci 2015; 9:388. [PMID: 26557049 PMCID: PMC4615940 DOI: 10.3389/fnins.2015.00388] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 10/05/2015] [Indexed: 12/16/2022] Open
Abstract
Exposure of organisms to repetitive mild hypoxia results in development of brain hypoxic/ischemic tolerance and cross-tolerance to injurious factors of a psycho-emotional nature. Such preconditioning by mild hypobaric hypoxia functions as a “warning” signal which prepares an organism, and in particular the brain, to subsequent more harmful conditions. The endogenous defense processes which are mobilized by hypoxic preconditioning and result in development of brain tolerance are based on evolutionarily acquired gene-determined mechanisms of adaptation and neuroprotection. They involve an activation of intracellular cascades including kinases, transcription factors and changes in expression of multiple regulatory proteins in susceptible areas of the brain. On the other hand they lead to multilevel modifications of the hypothalamic-pituitary-adrenal endocrine axis regulating various functions in the organism. All these components are engaged sequentially in the initiation, induction and expression of hypoxia-induced tolerance. A special role belongs to the epigenetic regulation of gene expression, in particular of histone acetylation leading to changes in chromatin structure which ensure access of pro-adaptive transcription factors activated by preconditioning to the promoters of target genes. Mechanisms of another, relatively novel, neuroprotective phenomenon termed hypoxic postconditioning (an application of mild hypoxic episodes after severe insults) are still largely unknown but according to recent data they involve apoptosis-related proteins, hypoxia-inducible factor and neurotrophins. The fundamental data accumulated to date and discussed in this review open new avenues for elaboration of the effective therapeutic applications of hypoxic pre- and postconditioning.
Collapse
Affiliation(s)
- Elena Rybnikova
- Laboratory of Neuroendocrinology, and Laboratory of Regulation of Brain Neuron Functions, Pavlov Institute of Physiology, Russian Academy of Sciences St. Petersburg, Russia
| | - Mikhail Samoilov
- Laboratory of Neuroendocrinology, and Laboratory of Regulation of Brain Neuron Functions, Pavlov Institute of Physiology, Russian Academy of Sciences St. Petersburg, Russia
| |
Collapse
|
12
|
Morris MJ, Monteggia LM. Role of DNA methylation and the DNA methyltransferases in learning and memory. DIALOGUES IN CLINICAL NEUROSCIENCE 2015. [PMID: 25364286 PMCID: PMC4214178 DOI: 10.31887/dcns.2014.16.3/mmorris] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Dynamic regulation of chromatin structure in postmitotic neurons plays an important role in learning and memory. Methylation of cytosine nucleotides has historically been considered the strongest and least modifiable of epigenetic marks. Accumulating recent data suggest that rapid and dynamic methylation and demethylation of specific genes in the brain may play a fundamental role in learning, memory formation, and behavioral plasticity. The current review focuses on the emergence of data that support the role of DNA methylation and demethylation, and its molecular mediators in memory formation.
Collapse
Affiliation(s)
- Michael J Morris
- Department of Biological Sciences, University of Michigan-Dearborn, Dearborn, Michigan, USA
| | - Lisa M Monteggia
- Department of Neuroscience, UT Southwestern Medical Center, Dallas, Texas, USA
| |
Collapse
|
13
|
Vrtačnik P, Marc J, Ostanek B. Hypoxia mimetic deferoxamine influences the expression of histone acetylation- and DNA methylation-associated genes in osteoblasts. Connect Tissue Res 2015; 56:228-35. [PMID: 25674819 DOI: 10.3109/03008207.2015.1017573] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE OF THE STUDY Sufficient oxygen supply to bone tissue is essential for normal bone development and efficient bone repair. Hypoxia and hypoxia-inducible factor 1α (HIF1α) signaling pathway have been shown to exhibit profound effects on proliferation, differentiation as well as gene and protein expression in osteoblasts, osteoclasts and mesenchymal stem cells; however, as epigenetic mechanisms also perform an important regulatory role in these cells, our aim was to elucidate whether hypoxia mimetic deferoxamine could influence epigenetic mechanisms in bone cells by modulating the gene expression levels of chromatin-modifying enzymes. MATERIALS AND METHODS Osteoblast cell line HOS was exposed to deferoxamine, a widely used hypoxia mimetic, and expression profile of 40 genes associated with histone acetylation, deacetylation and DNA methylation was determined using quantitative real time polymerase chain reaction (qPCR) array followed by individual qPCR analyses. In addition, genes associated with hypoxia response, RANK/RANKL/OPG system, WNT/β-catenin signaling pathway and oxidative stress were also analyzed. RESULTS We observed induced expression of histone deacetylase 9 (HDAC9) and suppressed expression of K(lysine) acetyltransferase 5 (KAT5) and DNA methyltransferase 3A (DNMT3A) demonstrating for the first time that expression of genes encoding chromatin-modifying enzymes could be influenced by hypoxia mimetic in HOS cells. CONCLUSIONS Based on our results we can conclude that hypoxia mimetic deferoxamine influences expression of histone acetylation- and DNA methylation-associated genes in osteoblasts and that further studies of hypoxia-induced epigenetic changes in bone cells should be undertaken.
Collapse
Affiliation(s)
- Peter Vrtačnik
- Department of Clinical Biochemistry, Faculty of Pharmacy, University of Ljubljana , Ljubljana , Slovenia
| | | | | |
Collapse
|
14
|
Daulatzai MA. “Boomerang Neuropathology” of Late-Onset Alzheimer’s Disease is Shrouded in Harmful “BDDS”: Breathing, Diet, Drinking, and Sleep During Aging. Neurotox Res 2015; 28:55-93. [DOI: 10.1007/s12640-015-9528-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Revised: 04/03/2015] [Accepted: 04/03/2015] [Indexed: 12/12/2022]
|
15
|
Nesbitt AMI, McCurdy RD, Bryant SM, Alter MD. Total levels of hippocampal histone acetylation predict normal variability in mouse behavior. PLoS One 2014; 9:e94224. [PMID: 24788142 PMCID: PMC4008481 DOI: 10.1371/journal.pone.0094224] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Accepted: 03/13/2014] [Indexed: 12/01/2022] Open
Abstract
Background Genetic, pharmacological, and environmental interventions that alter total levels of histone acetylation in specific brain regions can modulate behaviors and treatment responses. Efforts have been made to identify specific genes that are affected by alterations in total histone acetylation and to propose that such gene specific modulation could explain the effects of total histone acetylation levels on behavior — the implication being that under naturalistic conditions variability in histone acetylation occurs primarily around the promoters of specific genes. Methods/Results Here we challenge this hypothesis by demonstrating with a novel flow cytometry based technique that normal variability in open field exploration, a hippocampus-related behavior, was associated with total levels of histone acetylation in the hippocampus but not in other brain regions. Conclusions Results suggest that modulation of total levels of histone acetylation may play a role in regulating biological processes. We speculate in the discussion that endogenous regulation of total levels of histone acetylation may be a mechanism through which organisms regulate cellular plasticity. Flow cytometry provides a useful approach to measure total levels of histone acetylation at the single cell level. Relating such information to behavioral measures and treatment responses could inform drug delivery strategies to target histone deacetylase inhibitors and other chromatin modulators to places where they may be of benefit while avoiding areas where correction is not needed and could be harmful.
Collapse
Affiliation(s)
- Addie May I. Nesbitt
- Center for Neurobiology and Behavior, Department of Psychiatry, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Richard D. McCurdy
- Center for Neurobiology and Behavior, Department of Psychiatry, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Sharell M. Bryant
- Center for Neurobiology and Behavior, Department of Psychiatry, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Mark D. Alter
- Center for Neurobiology and Behavior, Department of Psychiatry, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Department of Psychiatry and Pharmacology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail:
| |
Collapse
|