1
|
Kakizawa S, Park JJ, Tonoki A. Biology of cognitive aging across species. Geriatr Gerontol Int 2024; 24 Suppl 1:15-24. [PMID: 38126240 DOI: 10.1111/ggi.14782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 11/27/2023] [Accepted: 12/01/2023] [Indexed: 12/23/2023]
Abstract
Aging is associated with cognitive decline, which can critically affect quality of life. Examining the biology of cognitive aging across species will lead to a better understanding of the fundamental mechanisms involved in this process, and identify potential interventions that could help to improve cognitive function in aging individuals. This minireview aimed to explore the mechanisms and processes involved in cognitive aging across a range of species, from flies to rodents, and covers topics, such as the role of reactive oxygen species and autophagy/mitophagy in cognitive aging. Overall, this literature provides a comprehensive overview of the biology of cognitive aging across species, highlighting the latest research findings and identifying potential avenues for future research. Geriatr Gerontol Int 2024; 24: 15-24.
Collapse
Affiliation(s)
- Sho Kakizawa
- Department of Biological Chemistry, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Joong-Jean Park
- Department of Physiology, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Ayako Tonoki
- Department of Biochemistry, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Japan
| |
Collapse
|
2
|
Mohammadi E, Nikbakht F, Vazifekhah S, Babae JF, Jogataei MT. Evaluation the cognition-improvement effects of N-acetyl cysteine in experimental temporal lobe epilepsy in rat. Behav Brain Res 2023; 440:114263. [PMID: 36563904 DOI: 10.1016/j.bbr.2022.114263] [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: 09/01/2022] [Revised: 12/13/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022]
Abstract
Memory impairment is a critical issue in patients with temporal lobe epilepsy (TLE). Neuronal loss within the hippocampus and recurrent seizures may cause cognitive impairment in TLE. N -acetyl cysteine (NAC) is a sulfur-containing amino acid cysteine that is currently being investigated due to its protective effects on neurodegenerative disorders. NAC was orally administrated at a dose of 100 mg/kg for 8 days (7-day pretreatment and 1-day post-surgery). Neuronal viability, mTOR protein level, and spatial memory were detected in the kainite temporal epilepsy model via Nissl staining, western blot method, and Morris water maze task, respectively. Results showed that NAC delayed seizure activity and ameliorated memory deficit induced by Kainic acid. Histological analysis showed that NAC significantly increased the number of intact neurons in CA3 and hilar areas of the hippocampus following the induction of epilepsy. NAC also modulated the mTOR protein level 5 days after epilepsy compared to the KA-induced group. CONCLUSION: These results suggest that NAC improved memory impairment via anticonvulsant and neuroprotective activity and, in all probability, by lowering the level of mTOR.
Collapse
Affiliation(s)
- Ekram Mohammadi
- Cellular and Molecular Research Center and Department of Physiology, School of Medicine, University of Medical Sciences, Tehran Iran
| | - Farnaz Nikbakht
- Cellular and Molecular Research Center and Department of Physiology, School of Medicine, University of Medical Sciences, Tehran Iran.
| | - Somayeh Vazifekhah
- Department of Basic Sciences, Sari Branch. Islamic Azad University, Sari, Iran
| | - Javad Fahanik Babae
- Electrophysiology Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohamad Taghi Jogataei
- Cellular and Molecular Research Center and Department of Anatomy, School of Medicine, University of Medical Sciences, Tehran Iran
| |
Collapse
|
3
|
Cho Y, Kim G, Park J. Mitochondrial aconitase 1 regulates age-related memory impairment via autophagy/mitophagy-mediated neural plasticity in middle-aged flies. Aging Cell 2021; 20:e13520. [PMID: 34799973 PMCID: PMC8672789 DOI: 10.1111/acel.13520] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 10/06/2021] [Accepted: 11/03/2021] [Indexed: 01/24/2023] Open
Abstract
Age‐related memory impairment (AMI) occurs in many species, including humans. The underlying mechanisms are not fully understood. In wild‐type Drosophila (w1118), AMI appears in the form of a decrease in learning (3‐min memory) from middle age (30 days after eclosion [DAE]). We performed in vivo, DNA microarray, and behavioral screen studies to identify genes controlling both lifespan and AMI and selected mitochondrial Acon1 (mAcon1). mAcon1 expression in the head of w1118 decreased with age. Neuronal overexpression of mAcon1 extended its lifespan and improved AMI. Neuronal or mushroom body expression of mAcon1 regulated the learning of young (10 DAE) and middle‐aged flies. Interestingly, acetyl‐CoA and citrate levels increased in the heads of middle‐aged and neuronal mAcon1 knockdown flies. Acetyl‐CoA, as a cellular energy sensor, is related to autophagy. Autophagy activity and efficacy determined by the positive and negative changes in the expression levels of Atg8a‐II and p62 were proportional to the expression level of mAcon1. Levels of the presynaptic active zone scaffold protein Bruchpilot were inversely proportional to neuronal mAcon1 levels in the whole brain. Furthermore, mAcon1 overexpression in Kenyon cells induced mitophagy labeled with mt‐Keima and improved learning ability. Both processes were blocked by pink1 knockdown. Taken together, our results imply that the regulation of learning and AMI by mAcon1 occurs via autophagy/mitophagy‐mediated neural plasticity.
Collapse
Affiliation(s)
- Yun‐Ho Cho
- Department of Physiology Korea University College of Medicine Seoul Republic of Korea
| | - Gye‐Hyeong Kim
- Department of Physiology Korea University College of Medicine Seoul Republic of Korea
| | - Joong‐Jean Park
- Department of Physiology Korea University College of Medicine Seoul Republic of Korea
| |
Collapse
|
4
|
Gabryel B, Duszkiewicz R. Sestrins as modulators of aging processes and diseases
related to age. POSTEP HIG MED DOSW 2021. [DOI: 10.5604/01.3001.0014.9471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Sestrins are highly conserved proteins that regulate cell growth, metabolism, survival
and proliferation under oxidative stress, genotoxic stress, hypoxia or endoplasmic
reticulum stress. Sestrins affect cell signaling by inhibiting the production of reactive
oxygen species, activating the AMP-activated protein kinase (AMPK), inhibiting
the mTOR pathway and acting as a positive regulator of autophagy. Therefore, their protective
role against cancer, metabolic disorders, cardiovascular diseases and neurodegeneration
is increasingly being postulated. The article describes the mechanisms of
action of sestrins and their meaning in aging and age-related diseases. The latest studies
indicating their physiological significance and role in key signaling pathways controlling
the cell metabolism and survival under stress conditions were also discussed.
Collapse
Affiliation(s)
- Bożena Gabryel
- Zakład Farmakologii Katedry Farmakologii, Wydział Nauk Medycznych w Katowicach, Śląski Uniwersytet Medyczny w Katowicach
| | - Roksana Duszkiewicz
- Zakład Farmakologii Katedry Farmakologii, Wydział Nauk Medycznych w Katowicach, Śląski Uniwersytet Medyczny w Katowicach
| |
Collapse
|
5
|
Underwood E, Redell JB, Zhao J, Moore AN, Dash PK. A method for assessing tissue respiration in anatomically defined brain regions. Sci Rep 2020; 10:13179. [PMID: 32764697 PMCID: PMC7413397 DOI: 10.1038/s41598-020-69867-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 07/16/2020] [Indexed: 12/28/2022] Open
Abstract
The survival and function of brain cells requires uninterrupted ATP synthesis. Different brain structures subserve distinct neurological functions, and therefore have different energy production/consumption requirements. Typically, mitochondrial function is assessed following their isolation from relatively large amounts of starting tissue, making it difficult to ascertain energy production/failure in small anatomical locations. In order to overcome this limitation, we have developed and optimized a method to measure mitochondrial function in brain tissue biopsy punches excised from anatomically defined brain structures, including white matter tracts. We describe the procedures for maintaining tissue viability prior to performing the biopsy punches, as well as provide guidance for optimizing punch size and the drug doses needed to assess various aspects of mitochondrial respiration. We demonstrate that our method can be used to measure mitochondrial respiration in anatomically defined subfields within the rat hippocampus. Using this method, we present experimental results which show that a mild traumatic brain injury (mTBI, often referred to as concussion) causes differential mitochondrial responses within these hippocampal subfields and the corpus callosum, novel findings that would have been difficult to obtain using traditional mitochondrial isolation methods. Our method is easy to implement and will be of interest to researchers working in the field of brain bioenergetics and brain diseases.
Collapse
Affiliation(s)
- Erica Underwood
- Department of Neurobiology and Anatomy, The University of Texas McGovern Medical School, Houston, TX, 77030, USA
| | - John B Redell
- Department of Neurobiology and Anatomy, The University of Texas McGovern Medical School, Houston, TX, 77030, USA
| | - Jing Zhao
- Department of Neurobiology and Anatomy, The University of Texas McGovern Medical School, Houston, TX, 77030, USA
| | - Anthony N Moore
- Department of Neurobiology and Anatomy, The University of Texas McGovern Medical School, Houston, TX, 77030, USA
| | - Pramod K Dash
- Department of Neurobiology and Anatomy, The University of Texas McGovern Medical School, Houston, TX, 77030, USA.
| |
Collapse
|
6
|
Common Protective Strategies in Neurodegenerative Disease: Focusing on Risk Factors to Target the Cellular Redox System. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:8363245. [PMID: 32832006 PMCID: PMC7422410 DOI: 10.1155/2020/8363245] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 07/15/2020] [Indexed: 12/14/2022]
Abstract
Neurodegenerative disease is an umbrella term for different conditions which primarily affect the neurons in the human brain. In the last century, significant research has been focused on mechanisms and risk factors relevant to the multifaceted etiopathogenesis of neurodegenerative diseases. Currently, neurodegenerative diseases are incurable, and the treatments available only control the symptoms or delay the progression of the disease. This review is aimed at characterizing the complex network of molecular mechanisms underpinning acute and chronic neurodegeneration, focusing on the disturbance in redox homeostasis, as a common mechanism behind five pivotal risk factors: aging, oxidative stress, inflammation, glycation, and vascular injury. Considering the complex multifactorial nature of neurodegenerative diseases, a preventive strategy able to simultaneously target multiple risk factors and disease mechanisms at an early stage is most likely to be effective to slow/halt the progression of neurodegenerative diseases.
Collapse
|
7
|
Sun W, Wang Y, Zheng Y, Quan N. The Emerging Role of Sestrin2 in Cell Metabolism, and Cardiovascular and Age-Related Diseases. Aging Dis 2020; 11:154-163. [PMID: 32010489 PMCID: PMC6961765 DOI: 10.14336/ad.2019.0320] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Accepted: 03/24/2019] [Indexed: 12/17/2022] Open
Abstract
Sestrins (Sesns), including Sesn1, Sesn2, and Sesn3, are cysteine sulfinyl reductases that play critical roles in the regulation of peroxide signaling and oxidant defense. Sesn2 is thought to regulate cell growth, metabolism, and survival response to various stresses, and act as a positive regulator of autophagy. The anti-oxidative and anti-aging roles of Sesn2 have been the focus of many recent studies. The role of Sesn2 in cellular metabolism and cardiovascular and age-related diseases must be analyzed and discussed. In this review, we discuss the physiological and pathophysiological roles and signaling pathways of Sesn2 in different stress-related conditions, such as oxidative stress, genotoxic stress, and hypoxia. Sesn2 is also involved in aging, cancer, diabetes, and ischemic heart disease. Understanding the actions of Sesn2 in cell metabolism and age-related diseases will provide new evidence for future experimental research and aid in the development of novel therapeutic strategies for Sesn2-related diseases.
Collapse
Affiliation(s)
- Wanqing Sun
- 1Cardiovascular Center, First Affiliated Hospital of Jilin University, Changchun, Jilin, China.,2Fuwai Hospital, National Center of Cardiovascular Diseases, Beijing, China
| | - Yishi Wang
- 3Department of Physiology and Pathophysiology, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Yang Zheng
- 1Cardiovascular Center, First Affiliated Hospital of Jilin University, Changchun, Jilin, China
| | - Nanhu Quan
- 1Cardiovascular Center, First Affiliated Hospital of Jilin University, Changchun, Jilin, China
| |
Collapse
|
8
|
Effect of Ginkgo biloba Extract EGb761 on Hippocampal Neuronal Injury and Carbonyl Stress of D-Gal-Induced Aging Rats. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2019; 2019:5165910. [PMID: 31871482 PMCID: PMC6907066 DOI: 10.1155/2019/5165910] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 07/09/2019] [Accepted: 07/31/2019] [Indexed: 11/17/2022]
Abstract
Background Ginkgo biloba extract is widely studied for antiaging activities, but little is known about its antiaging mechanism of protein carbonylation. In order to verify carbonyl toxification (stress) hypothesis of aging, we have investigated the effects of EGb761 on hippocampal neuronal injury and carbonyl stress of aging rats. Methods Seventy-two Wister male rats were randomly assigned into six groups (n = 12), normal control (NC), model control (MC), vitamin E (VE, 60 mg/kg) group, EGb761 low doses (GBEL, 8.75 mg/kg), EGb761 moderate doses (GBEM, 17.5 mg/kg), and EGb761 high doses (GBEH, 35 mg/kg). Except the NC, the other groups were subject to subcutaneous administration of 0.5% D-gal (10 ml/kg/day) for 6 weeks to induce aging model. The study detected cognitive impairment in rats by Morris water maze test and the contents of superoxidase dismutase (SOD), malondialdehyde (MDA), total antioxidant capacity (T-AOC) by the related kits. The level of 4-hydroxy-2-nonenal (4-HNE) protein adducts in rat brain was detected, and the ultrastructure of hippocampus was observed. Results The EGb761 treatment groups significantly improved the spatial learning and memory of rats. Moreover, EGb761 treatment could reduce hippocampal neuronal damage based on histopathological and ultrastructural observation. Further studies have proved that these activities are remarkably related with the reducing level of MDA, protein carbonyl and lipofuscin, and 4-HNE protein expression, as well as the increasing of SOD and T-AOC content. Furthermore, EGb761 improves telomerase activity by detecting telomerase activity in the brain of aging rats. Conclusion Our data indicate that EGb761 is an effective agent against D-gal-induced hippocampal neuronal loss owing to its antioxidative as well as carbonyl stress properties. Meanwhile, the carbonylation hypothesis is confirmed that the high level of 4-HNE may cause age-related neurodegenerative disorders.
Collapse
|
9
|
Differential activation of the mTOR/autophagy pathway predicts cognitive performance in APP/PS1 mice. Neurobiol Aging 2019; 83:105-113. [DOI: 10.1016/j.neurobiolaging.2019.08.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 07/19/2019] [Accepted: 08/17/2019] [Indexed: 12/16/2022]
|
10
|
Jewell JS, Duncan VD, Fesshaye A, Tondin A, Macadat E, Britten RA. Exposure to ≤15 cGy of 600 MeV/n 56Fe Particles Impairs Rule Acquisition but not Long-Term Memory in the Attentional Set-Shifting Assay. Radiat Res 2018; 190:565-575. [DOI: 10.1667/rr15085.1] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Jessica S. Jewell
- Department of a Radiation Oncology, Eastern Virginia Medical School, Norfolk, Virginia 23507
| | - Vania D. Duncan
- Department of a Radiation Oncology, Eastern Virginia Medical School, Norfolk, Virginia 23507
| | - Arriyam Fesshaye
- Department of a Radiation Oncology, Eastern Virginia Medical School, Norfolk, Virginia 23507
| | - Abigail Tondin
- Department of a Radiation Oncology, Eastern Virginia Medical School, Norfolk, Virginia 23507
| | - Evangeline Macadat
- Department of a Radiation Oncology, Eastern Virginia Medical School, Norfolk, Virginia 23507
| | - Richard A. Britten
- Department of a Radiation Oncology, Eastern Virginia Medical School, Norfolk, Virginia 23507
| |
Collapse
|
11
|
Hylin MJ, Zhao J, Tangavelou K, Rozas NS, Hood KN, MacGowan JS, Moore AN, Dash PK. A role for autophagy in long-term spatial memory formation in male rodents. J Neurosci Res 2017; 96:416-426. [PMID: 29230855 DOI: 10.1002/jnr.24121] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 06/27/2017] [Accepted: 06/28/2017] [Indexed: 12/13/2022]
Abstract
A hallmark of long-term memory formation is the requirement for protein synthesis. Administration of protein synthesis inhibitors impairs long-term memory formation without influencing short-term memory. Rapamycin is a specific inhibitor of target of rapamycin complex 1 (TORC1) that has been shown to block protein synthesis and impair long-term memory. In addition to regulating protein synthesis, TORC1 also phosphorylates Unc-51-like autophagy activating kinase-1 (Ulk-1) to suppress autophagy. As autophagy can be activated by rapamycin (and rapamycin inhibits long-term memory), our aim was to test the hypothesis that autophagy inhibitors would enhance long-term memory. To examine if learning alters autophagosome number, we used male reporter mice carrying the GFP-LC3 transgene. Using these mice, we observed that training in the Morris water maze task increases the number of autophagosomes, a finding contrary to our expectations. For learning and memory studies, male Long Evans rats were used due to their relatively larger size (compared to mice), making it easier to perform intrahippocampal infusions in awake, moving animals. When the autophagy inhibitors 3-methyladenine (3-MA) or Spautin-1 were administered bilaterally into the hippocampii prior to training in the Morris water maze task, the drugs did not alter learning. In contrast, when memory was tested 24 hours later by a probe trial, significant impairments were observed. In addition, intrahippocampal infusion of an autophagy activator peptide (TAT-Beclin-1) improved long-term memory. These results indicate that autophagy is not necessary for learning, but is required for long-term memory formation.
Collapse
Affiliation(s)
- Michael J Hylin
- Department of Neurobiology and Anatomy, the University of Texas McGovern Medical School, Houston, Texas, USA
| | - Jing Zhao
- Department of Neurobiology and Anatomy, the University of Texas McGovern Medical School, Houston, Texas, USA
| | - Karthikeyan Tangavelou
- Department of Neurobiology and Anatomy, the University of Texas McGovern Medical School, Houston, Texas, USA
| | - Natalia S Rozas
- Department of Neurobiology and Anatomy, the University of Texas McGovern Medical School, Houston, Texas, USA
| | - Kimberly N Hood
- Department of Neurobiology and Anatomy, the University of Texas McGovern Medical School, Houston, Texas, USA
| | - Jacalyn S MacGowan
- Department of Neurobiology and Anatomy, the University of Texas McGovern Medical School, Houston, Texas, USA
| | - Anthony N Moore
- Department of Neurobiology and Anatomy, the University of Texas McGovern Medical School, Houston, Texas, USA
| | - Pramod K Dash
- Department of Neurobiology and Anatomy, the University of Texas McGovern Medical School, Houston, Texas, USA
| |
Collapse
|
12
|
Hadem IKH, Majaw T, Kharbuli B, Sharma R. Beneficial effects of dietary restriction in aging brain. J Chem Neuroanat 2017; 95:123-133. [PMID: 29031555 DOI: 10.1016/j.jchemneu.2017.10.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 09/14/2017] [Accepted: 10/10/2017] [Indexed: 12/20/2022]
Abstract
Aging is a multifactorial complex process that leads to the deterioration of biological functions wherein its underlying mechanism is not fully elucidated. It affects the organism at the molecular and cellular level that contributes to the deterioration of structural integrity of the organs. The central nervous system is the most vulnerable organ affected by aging and its effect is highly heterogeneous. Aging causes alteration in the structure, metabolism and physiology of the brain leading to impaired cognitive and motor-neural functions. Dietary restriction (DR), a robust mechanism that extends lifespan in various organisms, ameliorates brain aging by reducing oxidative stress, improving mitochondrial function, activating anti-inflammatory responses, promoting neurogenesis and increasing synaptic plasticity. It also protects and prevents age-related structural changes. DR alleviates many age-associated diseases including neurodegeneration and improves cognitive functions. DR inhibits/activates nutrient signaling cascades such as insulin/IGF-1, mTOR, AMPK and sirtuins. Because of its sensitivity to energy status and hormones, AMPK is considered as the global nutrient sensor. This review will present an elucidative potential role of dietary restriction in the prevention of phenotypic features during aging in brain and its diverse mechanisms.
Collapse
Affiliation(s)
| | - Teikur Majaw
- Department of Biochemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
| | - Babiangshisha Kharbuli
- Department of Biochemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India
| | - Ramesh Sharma
- Department of Biochemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India.
| |
Collapse
|
13
|
de Weerd L, Hermann PM, Wildering WC. Linking the 'why' and 'how' of ageing: evidence for somatotropic control of long-term memory function in the pond snail Lymnaea stagnalis. ACTA ACUST UNITED AC 2017; 220:4088-4094. [PMID: 28954817 DOI: 10.1242/jeb.167395] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 09/22/2017] [Indexed: 12/11/2022]
Abstract
Organisms live on a budget; hence, they cannot maximize all their activities at the same time. Instead, they must prioritize how they spend limiting resources on the many processes they rely on in their lives. Among others, they are thought to economize on the maintenance and repair processes required for survival in favour of maximizing reproduction, with ageing as a consequence. We investigate the biological mechanisms of neuronal ageing. Using Lymnaea stagnalis, we have previously described various aspects of age-associated neuronal decline and appetitive long-term memory failure. In view of postulated trade-offs between somatic maintenance and reproduction, we tested for interactions between resource allocation mechanisms and brain function. We show that removal of the lateral lobes, which are key regulators of energy balance in L. stagnalis, increases body mass and enhances appetitive learning, raising the possibility that the lateral lobes are one of the sites where the 'why' and 'how' of (neuronal) ageing meet.
Collapse
Affiliation(s)
- Lis de Weerd
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary T2N 1N4, Alberta, Canada
| | - Petra M Hermann
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary T2N 1N4, Alberta, Canada.,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary T2N 4N1, Alberta, Canada
| | - Willem C Wildering
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary T2N 1N4, Alberta, Canada .,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary T2N 4N1, Alberta, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary T2N 4N1, Alberta, Canada
| |
Collapse
|
14
|
Mozhui K, Snively BM, Rapp SR, Wallace RB, Williams RW, Johnson KC. Genetic Analysis of Mitochondrial Ribosomal Proteins and Cognitive Aging in Postmenopausal Women. Front Genet 2017; 8:127. [PMID: 28983317 PMCID: PMC5613226 DOI: 10.3389/fgene.2017.00127] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 09/04/2017] [Indexed: 11/24/2022] Open
Abstract
Genes encoding mitochondrial ribosomal proteins (MRPs) have been linked to aging and longevity in model organisms (i.e., mice, Caenorhabditis elegans). Here we evaluated if the MRPs have conserved effects on aging traits in humans. We utilized data from 4,504 participants of the Women's Health Initiative Memory Study (WHIMS) who had both longitudinal cognitive data and genetic data. Two aging phenotypes were considered: (1) gross lifespan (time to all-cause mortality), and (2) cognitive aging (longitudinal rate of change in modified mini-mental state scores). We tested genetic association with variants in 78 members of the MRP gene family. Genetic association tests were done at the single nucleotide polymorphism (SNP) level, and at gene-set level using two distinct procedures (GATES and MAGMA). We included SNPs in APOE and adjusted the tests for the APOE-ε4 allele, a known risk factor for dementia. The strongest association signal is for the known cognitive aging SNP, rs429358, in APOE (p-value = 5 × 10-28 for cognitive aging; p-value = 0.03 for survival). We found no significant association between the MRPs and survival time. For cognitive aging, we detected SNP level association for rs189661478 in MRPL23 (p-value < 9 × 10-6). Furthermore, the gene-set analysis showed modest but significant association between the MRP family and cognitive aging. In conclusion, our results indicate a potential pathway-level association between the MRPs and cognitive aging that is independent of the APOE locus. We however did not detect association between the MRPs and lifespan.
Collapse
Affiliation(s)
- Khyobeni Mozhui
- Department of Preventive Medicine, University of Tennessee Health Science CenterMemphis, TN, United States
- Department of Genetics, Genomics and Informatics, University of Tennessee Health Science CenterMemphis, TN, United States
| | - Beverly M. Snively
- Department of Biostatistical Sciences, Wake Forest University School of MedicineWinston-Salem, NC, United States
| | - Stephen R. Rapp
- Department of Psychiatry and Behavioral Medicine, Wake Forest University School of MedicineWinston-Salem, NC, United States
| | - Robert B. Wallace
- Department of Epidemiology, University of Iowa College of Public HealthIowa City, IA, United States
| | - Robert W. Williams
- Department of Genetics, Genomics and Informatics, University of Tennessee Health Science CenterMemphis, TN, United States
| | - Karen C. Johnson
- Department of Preventive Medicine, University of Tennessee Health Science CenterMemphis, TN, United States
| |
Collapse
|
15
|
Correa-Netto NF, Coelho LS, Galfano GS, Nishide F, Tamura F, Shimizu MK, Santos JG, Linardi A. Chronic intermittent exposure to ayahuasca during aging does not affect memory in mice. Braz J Med Biol Res 2017; 50:e6037. [PMID: 28591380 PMCID: PMC5463533 DOI: 10.1590/1414-431x20176037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 04/11/2017] [Indexed: 11/22/2022] Open
Abstract
The Quechua term ayahuasca refers to a beverage obtained from decoctions of the liana Banisteriopsis caapi with leaves of Psychotria viridis. The ritualistic use of ayahuasca is becoming a global phenomenon, with some individuals using this beverage throughout life, including in old age. Cognitive impairment is a common manifestation during aging. There are conflicting reports on the ability of some ayahuasca compounds to exert neuroprotective or neurotoxic effects that could improve or impair learning and memory. Animal models provide a relevant and accessible means of investigating the behavioral effects of ayahuasca without the environmental conditions associated with the ritualistic use of the beverage. In this study, we investigated the influence of chronic ayahuasca exposure throughout aging on the spatial reference and habituation memories of mice. Twenty-eight male c57bl/6 mice (6 months old) received ayahuasca or water (1.5 mL/kg, orally) twice a week for 12 months and were tested in the Morris water maze (MWM), open field and elevated plus maze (EPM) tasks before and after treatment. During aging, there was significant impairment in the evocation (but not acquisition) of spatial reference memory and in habituation to the open field. There was also a decrease in locomotor activity in the open field and EPM tests, whereas the anxiety parameters were unaltered. Ayahuasca treatment did not alter any of these parameters associated with aging. These findings indicate that chronic exposure to ayahuasca during aging did not affect memory in mice.
Collapse
Affiliation(s)
- N F Correa-Netto
- Departamento de Ciências Fisiológicas, Faculdade de Ciências Médicas, Santa Casa de São Paulo, São Paulo, SP, Brasil
| | - L S Coelho
- Departamento de Ciências Fisiológicas, Faculdade de Ciências Médicas, Santa Casa de São Paulo, São Paulo, SP, Brasil
| | - G S Galfano
- Departamento de Ciências Fisiológicas, Faculdade de Ciências Médicas, Santa Casa de São Paulo, São Paulo, SP, Brasil
| | - F Nishide
- Departamento de Ciências Fisiológicas, Faculdade de Ciências Médicas, Santa Casa de São Paulo, São Paulo, SP, Brasil
| | - F Tamura
- Departamento de Ciências Fisiológicas, Faculdade de Ciências Médicas, Santa Casa de São Paulo, São Paulo, SP, Brasil
| | - M K Shimizu
- Departamento de Ciências Fisiológicas, Faculdade de Ciências Médicas, Santa Casa de São Paulo, São Paulo, SP, Brasil
| | - J G Santos
- Departamento de Ciências Fisiológicas, Faculdade de Ciências Médicas, Santa Casa de São Paulo, São Paulo, SP, Brasil
| | - A Linardi
- Departamento de Ciências Fisiológicas, Faculdade de Ciências Médicas, Santa Casa de São Paulo, São Paulo, SP, Brasil
| |
Collapse
|
16
|
Schindler N, Mayer J, Saenger S, Gimsa U, Walz C, Brenmoehl J, Ohde D, Wirthgen E, Tuchscherer A, Russo VC, Frank M, Kirschstein T, Metzger F, Hoeflich A. Phenotype analysis of male transgenic mice overexpressing mutant IGFBP-2 lacking the Cardin-Weintraub sequence motif: Reduced expression of synaptic markers and myelin basic protein in the brain and a lower degree of anxiety-like behaviour. Growth Horm IGF Res 2017; 33:1-8. [PMID: 27919008 DOI: 10.1016/j.ghir.2016.11.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 10/18/2016] [Accepted: 11/14/2016] [Indexed: 01/07/2023]
Abstract
Brain growth and function are regulated by insulin-like growth factors I and II (IGF-I and IGF-II) but also by IGF-binding proteins (IGFBPs), including IGFBP-2. In addition to modulating IGF activities, IGFBP-2 interacts with a number of components of the extracellular matrix and cell membrane via a Cardin-Weintraub sequence or heparin binding domain (HBD1). The nature and the signalling elicited by these interactions are not fully understood. Here, we examined transgenic mice (H1d-hBP2) overexpressing a mutant human IGFBP-2 that lacks a specific heparin binding domain (HBD1) known as the Cardin-Weintraub sequence. H1d-hBP2 transgenic mice have the genetic background of FVB mice and are characterized by severe deficits in brain growth throughout their lifetime (p<0.05). In tissue lysates from brain hemispheres of 12-21day old male mice, protein levels of the GTPase dynamin-I were significantly reduced (p<0.01). Weight reductions were also found in distinct brain regions in two different age groups (12 and 80weeks). In the younger group, impaired weights were observed in the hippocampus (-34%; p<0.001), cerebellum (-25%; p<0.0001), olfactory bulb (-31%; p<0.05) and prefrontal cortex (-29%; p<0.05). At an age of 12weeks expression of myelin basic protein was reduced (p<0.01) in H1d-BP-2 mice in the cerebellum but not in the hippocampus. At 80weeks of age, weight reductions were similarly present in the cerebellum (-28%; p<0.001) and hippocampus (-31; p<0.05). When mice were challenged in the elevated plus maze, aged but not younger H1d-hBP2 mice displayed significantly less anxiety-like behaviour, which was also observed in a second transgenic mouse model overexpressing mouse IGFBP-2 lacking HBD1 (H1d-mBP2). These in vivo studies provide, for the first time, evidence for a specific role of IGFBP-2 in brain functions associated with anxiety and risk behaviour. These activities of IGFBP-2 could be mediated by the Cardin-Weintraub/HBD1 sequence and are altered in mice expressing IGFBP-2 lacking the HBD1.
Collapse
Affiliation(s)
- N Schindler
- Institute of Genome Biology, Leibniz-Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - J Mayer
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - S Saenger
- F. Hoffmann-La Roche AG, pRED, Pharma Research & Early Development, DTA CNS, Basel, Switzerland
| | - U Gimsa
- Institute of Behavioural Physiology, Leibniz-Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - C Walz
- Institute of Genome Biology, Leibniz-Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - J Brenmoehl
- Institute of Genome Biology, Leibniz-Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - D Ohde
- Institute of Genome Biology, Leibniz-Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - E Wirthgen
- Institute of Genome Biology, Leibniz-Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - A Tuchscherer
- Institute of Genetic and Biometry, Leibniz-Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - V C Russo
- Hormone Research, Murdoch Childrens Research Institute, University of Melbourne, Australia
| | - M Frank
- Medical Biology and Electron Microscopy Centre, University Medicine Rostock, Rostock, Germany
| | - T Kirschstein
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - F Metzger
- F. Hoffmann-La Roche AG, pRED, Pharma Research & Early Development, DTA CNS, Basel, Switzerland
| | - A Hoeflich
- Institute of Genome Biology, Leibniz-Institute for Farm Animal Biology (FBN), Dummerstorf, Germany.
| |
Collapse
|
17
|
Lucanic M, Plummer WT, Chen E, Harke J, Foulger AC, Onken B, Coleman-Hulbert AL, Dumas KJ, Guo S, Johnson E, Bhaumik D, Xue J, Crist AB, Presley MP, Harinath G, Sedore CA, Chamoli M, Kamat S, Chen MK, Angeli S, Chang C, Willis JH, Edgar D, Royal MA, Chao EA, Patel S, Garrett T, Ibanez-Ventoso C, Hope J, Kish JL, Guo M, Lithgow GJ, Driscoll M, Phillips PC. Impact of genetic background and experimental reproducibility on identifying chemical compounds with robust longevity effects. Nat Commun 2017; 8:14256. [PMID: 28220799 PMCID: PMC5321775 DOI: 10.1038/ncomms14256] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Accepted: 12/13/2016] [Indexed: 12/19/2022] Open
Abstract
Limiting the debilitating consequences of ageing is a major medical challenge of our time. Robust pharmacological interventions that promote healthy ageing across diverse genetic backgrounds may engage conserved longevity pathways. Here we report results from the Caenorhabditis Intervention Testing Program in assessing longevity variation across 22 Caenorhabditis strains spanning 3 species, using multiple replicates collected across three independent laboratories. Reproducibility between test sites is high, whereas individual trial reproducibility is relatively low. Of ten pro-longevity chemicals tested, six significantly extend lifespan in at least one strain. Three reported dietary restriction mimetics are mainly effective across C. elegans strains, indicating species and strain-specific responses. In contrast, the amyloid dye ThioflavinT is both potent and robust across the strains. Our results highlight promising pharmacological leads and demonstrate the importance of assessing lifespans of discrete cohorts across repeat studies to capture biological variation in the search for reproducible ageing interventions.
Collapse
Affiliation(s)
- Mark Lucanic
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - W Todd Plummer
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Esteban Chen
- Nelson Biological Laboratories, Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Jailynn Harke
- Institute of Ecology and Evolution, University of Oregon, Eugene, Oregon 97403, USA
| | - Anna C Foulger
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Brian Onken
- Nelson Biological Laboratories, Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08854, USA
| | | | - Kathleen J Dumas
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Suzhen Guo
- Nelson Biological Laboratories, Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Erik Johnson
- Institute of Ecology and Evolution, University of Oregon, Eugene, Oregon 97403, USA
| | - Dipa Bhaumik
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Jian Xue
- Nelson Biological Laboratories, Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Anna B Crist
- Institute of Ecology and Evolution, University of Oregon, Eugene, Oregon 97403, USA
| | - Michael P Presley
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Girish Harinath
- Nelson Biological Laboratories, Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Christine A Sedore
- Institute of Ecology and Evolution, University of Oregon, Eugene, Oregon 97403, USA
| | - Manish Chamoli
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Shaunak Kamat
- Nelson Biological Laboratories, Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Michelle K Chen
- Institute of Ecology and Evolution, University of Oregon, Eugene, Oregon 97403, USA
| | - Suzanne Angeli
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Christina Chang
- Nelson Biological Laboratories, Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08854, USA
| | - John H Willis
- Institute of Ecology and Evolution, University of Oregon, Eugene, Oregon 97403, USA
| | - Daniel Edgar
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Mary Anne Royal
- Nelson Biological Laboratories, Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Elizabeth A Chao
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Shobhna Patel
- Nelson Biological Laboratories, Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Theo Garrett
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Carolina Ibanez-Ventoso
- Nelson Biological Laboratories, Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08854, USA
| | - June Hope
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Jason L Kish
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Max Guo
- Division of Aging Biology, National Institute on Aging, 7201 Wisconsin Avenue, Bethesda, Maryland 20892-9205, USA
| | - Gordon J Lithgow
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, California 94945, USA
| | - Monica Driscoll
- Nelson Biological Laboratories, Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Patrick C Phillips
- Institute of Ecology and Evolution, University of Oregon, Eugene, Oregon 97403, USA
| |
Collapse
|
18
|
Poulose SM, Rabin BM, Bielinski DF, Kelly ME, Miller MG, Thanthaeng N, Shukitt-Hale B. Neurochemical differences in learning and memory paradigms among rats supplemented with anthocyanin-rich blueberry diets and exposed to acute doses of 56Fe particles. LIFE SCIENCES IN SPACE RESEARCH 2017; 12:16-23. [PMID: 28212704 DOI: 10.1016/j.lssr.2016.12.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 12/04/2016] [Indexed: 06/06/2023]
Abstract
The protective effects of anthocyanin-rich blueberries (BB) on brain health are well documented and are particularly important under conditions of high oxidative stress, which can lead to "accelerated aging." One such scenario is exposure to space radiation, consisting of high-energy and -charge particles (HZE), which are known to cause cognitive dysfunction and deleterious neurochemical alterations. We recently tested the behavioral and neurochemical effects of acute exposure to HZE particles such as 56Fe, within 24-48h after exposure, and found that radiation primarily affects memory and not learning. Importantly, we observed that specific brain regions failed to upregulate antioxidant and anti-inflammatory mechanisms in response to this insult. To further examine these endogenous response mechanisms, we have supplemented young rats with diets rich in BB, which are known to contain high amounts of antioxidant-phytochemicals, prior to irradiation. Exposure to 56Fe caused significant neurochemical changes in hippocampus and frontal cortex, the two critical regions of the brain involved in cognitive function. BB supplementation significantly attenuated protein carbonylation, which was significantly increased by exposure to 56Fe in the hippocampus and frontal cortex. Moreover, BB supplementation significantly reduced radiation-induced elevations in NADPH-oxidoreductase-2 (NOX2) and cyclooxygenase-2 (COX-2), and upregulated nuclear factor erythroid 2-related factor 2 (Nrf2) in the hippocampus and frontal cortex. Overall results indicate that 56Fe particles may induce their toxic effects on hippocampus and frontal cortex by reactive oxygen species (ROS) overload, which can cause alterations in the neuronal environment, eventually leading to hippocampal neuronal death and subsequent impairment of cognitive function. Blueberry supplementation provides an effective preventative measure to reduce the ROS load on the CNS in an event of acute HZE exposure.
Collapse
Affiliation(s)
- Shibu M Poulose
- USDA Human Nutrtion Research Center on Aging at Tufts University, 711 Washington Street, Boston MA 02111, USA
| | | | - Donna F Bielinski
- USDA Human Nutrtion Research Center on Aging at Tufts University, 711 Washington Street, Boston MA 02111, USA
| | - Megan E Kelly
- USDA Human Nutrtion Research Center on Aging at Tufts University, 711 Washington Street, Boston MA 02111, USA
| | - Marshall G Miller
- USDA Human Nutrtion Research Center on Aging at Tufts University, 711 Washington Street, Boston MA 02111, USA
| | - Nopporn Thanthaeng
- USDA Human Nutrtion Research Center on Aging at Tufts University, 711 Washington Street, Boston MA 02111, USA
| | - Barbara Shukitt-Hale
- USDA Human Nutrtion Research Center on Aging at Tufts University, 711 Washington Street, Boston MA 02111, USA.
| |
Collapse
|
19
|
Hadem IKH, Sharma R. Differential Regulation of Hippocampal IGF-1-Associated Signaling Proteins by Dietary Restriction in Aging Mouse. Cell Mol Neurobiol 2016; 37:985-993. [DOI: 10.1007/s10571-016-0431-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 09/30/2016] [Indexed: 12/22/2022]
|
20
|
Neurochemical correlation between major depressive disorder and neurodegenerative diseases. Life Sci 2016; 158:121-9. [DOI: 10.1016/j.lfs.2016.06.027] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 06/14/2016] [Accepted: 06/27/2016] [Indexed: 12/13/2022]
|
21
|
Li L, Peng Y, Hui Y, Zhang S, Zhou Y, Li D, Li J, Si Z, Li J, Wang D, Li Y, Dong M, Gao X. Overexpression of Heme Oxygenase 1 Impairs Cognitive Ability and Changes the Plasticity of the Synapse. J Alzheimers Dis 2015; 47:595-608. [DOI: 10.3233/jad-150027] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Lisha Li
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
- State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Harbin, China
- Key Laboratory of Cardiovascular Medicine Research (Harbin Medical University), Ministry of Education, Harbin, China
| | - Yahui Peng
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
- State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Harbin, China
- Key Laboratory of Cardiovascular Medicine Research (Harbin Medical University), Ministry of Education, Harbin, China
| | - Yang Hui
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
- State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Harbin, China
- Key Laboratory of Cardiovascular Medicine Research (Harbin Medical University), Ministry of Education, Harbin, China
| | - Shuai Zhang
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
| | - You Zhou
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
| | - Dan Li
- People’s Hospital of Yuxi City, Yuki, China
| | - Jihong Li
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
- State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Harbin, China
- Key Laboratory of Cardiovascular Medicine Research (Harbin Medical University), Ministry of Education, Harbin, China
| | - Zizhen Si
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
| | - Jing Li
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
| | - Dayong Wang
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
- State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Harbin, China
- Key Laboratory of Cardiovascular Medicine Research (Harbin Medical University), Ministry of Education, Harbin, China
| | - Yanze Li
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
- State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Harbin, China
- Key Laboratory of Cardiovascular Medicine Research (Harbin Medical University), Ministry of Education, Harbin, China
| | - Min Dong
- GE Healthcare Life Sciences, Shanghai, China
| | - Xu Gao
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China
- State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Harbin, China
- Key Laboratory of Cardiovascular Medicine Research (Harbin Medical University), Ministry of Education, Harbin, China
| |
Collapse
|
22
|
Rabin BM, Poulose SM, Carrihill-Knoll KL, Ramirez F, Bielinski DF, Heroux N, Shukitt-Hale B. Acute Effects of Exposure to56Fe and16O Particles on Learning and Memory. Radiat Res 2015. [DOI: 10.1667/rr13935.1] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
23
|
Perl A. mTOR activation is a biomarker and a central pathway to autoimmune disorders, cancer, obesity, and aging. Ann N Y Acad Sci 2015; 1346:33-44. [PMID: 25907074 DOI: 10.1111/nyas.12756] [Citation(s) in RCA: 159] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The mechanistic target of rapamycin (mTOR) is a ubiquitous serine/threonine kinase, which plays pivotal roles in integrating growth signals on a cellular level. To support proliferation and survival under stress, two interacting complexes that harbor mTOR, mTORC1 and mTORC2, promote the transcription of genes involved in carbohydrate metabolism and lipogenesis, enhance protein translation, and inhibit autophagy. Although rapamycin was originally developed as an inhibitor of T cell proliferation for preventing organ transplant rejection, its molecular target, mTOR, has been subsequently identified as a central regulator of metabolic cues that drive lineage specification in the immune system. Owing to oxidative stress, the activation of mTORC1 has emerged as a central pathway for the pathogenesis of systemic lupus erythematosus and other autoimmune diseases. Paradoxically, mTORC1 has also been identified as a mediator of the Warburg effect that allows cell survival under hypoxia. Rapamycin and new classes of mTOR inhibitors are being developed to block not only transplant rejection and autoimmunity but also to treat obesity and various forms of cancer. Through preventing these diseases, personalized mTOR blockade holds promise to extend life span.
Collapse
Affiliation(s)
- Andras Perl
- Division of Rheumatology, Department of Medicine State University of New York, Upstate Medical University, College of Medicine, Syracuse, New York.,Division of Rheumatology, Department of Microbiology and Immunology, State University of New York, Upstate Medical University, College of Medicine, Syracuse, New York
| |
Collapse
|
24
|
Hsu YW, Wang HJ, Hsieh MH, Hsieh HL, Jauh GY. Arabidopsis mTERF15 is required for mitochondrial nad2 intron 3 splicing and functional complex I activity. PLoS One 2014; 9:e112360. [PMID: 25402171 PMCID: PMC4234379 DOI: 10.1371/journal.pone.0112360] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 10/03/2014] [Indexed: 01/08/2023] Open
Abstract
Mitochondria play a pivotal role in most eukaryotic cells, as they are responsible for the generation of energy and diverse metabolic intermediates for many cellular events. During endosymbiosis, approximately 99% of the genes encoded by the mitochondrial genome were transferred into the host nucleus, and mitochondria import more than 1000 nuclear-encoded proteins from the cytosol to maintain structural integrity and fundamental functions, including DNA replication, mRNA transcription and RNA metabolism of dozens of mitochondrial genes. In metazoans, a family of nuclear-encoded proteins called the mitochondrial transcription termination factors (mTERFs) regulates mitochondrial transcription, including transcriptional termination and initiation, via their DNA-binding activities, and the dysfunction of individual mTERF members causes severe developmental defects. Arabidopsis thaliana and Oryza sativa contain 35 and 48 mTERFs, respectively, but the biological functions of only a few of these proteins have been explored. Here, we investigated the biological role and molecular mechanism of Arabidopsis mTERF15 in plant organelle metabolism using molecular genetics, cytological and biochemical approaches. The null homozygous T-DNA mutant of mTERF15, mterf15, was found to result in substantial retardation of both vegetative and reproductive development, which was fully complemented by the wild-type genomic sequence. Surprisingly, mitochondria-localized mTERF15 lacks obvious DNA-binding activity but processes mitochondrial nad2 intron 3 splicing through its RNA-binding ability. Impairment of this splicing event not only disrupted mitochondrial structure but also abolished the activity of mitochondrial respiratory chain complex I. These effects are in agreement with the severe phenotype of the mterf15 homozygous mutant. Our study suggests that Arabidopsis mTERF15 functions as a splicing factor for nad2 intron 3 splicing in mitochondria, which is essential for normal plant growth and development.
Collapse
Affiliation(s)
- Ya-Wen Hsu
- Institute of Plant Biology, National Taiwan University, Taipei, 116, Taiwan, ROC
- Institute of Plant and Microbial Biology, Academia Sinica, Nankang, Taipei, 11529, Taiwan, ROC
| | - Huei-Jing Wang
- Institute of Plant and Microbial Biology, Academia Sinica, Nankang, Taipei, 11529, Taiwan, ROC
| | - Ming-Hsiun Hsieh
- Institute of Plant and Microbial Biology, Academia Sinica, Nankang, Taipei, 11529, Taiwan, ROC
| | - Hsu-Liang Hsieh
- Institute of Plant Biology, National Taiwan University, Taipei, 116, Taiwan, ROC
| | - Guang-Yuh Jauh
- Institute of Plant and Microbial Biology, Academia Sinica, Nankang, Taipei, 11529, Taiwan, ROC
- Biotechnology Center, National Chung-Hsing University, Taichung, 402, Taiwan, ROC
- * E-mail:
| |
Collapse
|
25
|
Murakami S, Halperin AS. Alzheimer's patient feedback to complement research using model systems for cognitive aging and dementia. Front Genet 2014; 5:269. [PMID: 25147560 PMCID: PMC4123719 DOI: 10.3389/fgene.2014.00269] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Accepted: 07/21/2014] [Indexed: 11/13/2022] Open
Affiliation(s)
- Shin Murakami
- Department of Basic Sciences, College of Osteopathic Medicine, Touro University-California Vallejo, CA, USA
| | - Alexander Sandy Halperin
- Early-Stage Advisory Group/Alumnus (2012-2013), National Alzheimer's Association Chicago, IL, USA ; Alzheimer's Project, Inc. Tallahassee, FL, USA
| |
Collapse
|