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Yong J, Song J. CaMKII activity and metabolic imbalance-related neurological diseases: Focus on vascular dysfunction, synaptic plasticity, amyloid beta accumulation, and lipid metabolism. Biomed Pharmacother 2024; 175:116688. [PMID: 38692060 DOI: 10.1016/j.biopha.2024.116688] [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: 02/01/2024] [Revised: 04/25/2024] [Accepted: 04/29/2024] [Indexed: 05/03/2024] Open
Abstract
Metabolic syndrome (MetS) is characterized by insulin resistance, hyperglycemia, excessive fat accumulation and dyslipidemia, and is known to be accompanied by neuropathological symptoms such as memory loss, anxiety, and depression. As the number of MetS patients is rapidly increasing globally, studies on the mechanisms of metabolic imbalance-related neuropathology are emerging as an important issue. Ca2+/calmodulin-dependent kinase II (CaMKII) is the main Ca2+ sensor and contributes to diverse intracellular signaling in peripheral organs and the central nervous system (CNS). CaMKII exerts diverse functions in cells, related to mechanisms such as RNA splicing, reactive oxygen species (ROS) generation, cytoskeleton, and protein-protein interactions. In the CNS, CaMKII regulates vascular function, neuronal circuits, neurotransmission, synaptic plasticity, amyloid beta toxicity, lipid metabolism, and mitochondrial function. Here, we review recent evidence for the role of CaMKII in neuropathologic issues associated with metabolic disorders.
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Affiliation(s)
- Jeongsik Yong
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota Twin Cities, Minneapolis, MN, USA
| | - Juhyun Song
- Department of Anatomy, Chonnam National University Medical School, Hwasun, Jeollanam-do, Republic of Korea.
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2
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Rodriguez G, Eren M, Haupfear I, Viola KL, Cline EN, Miyata T, Klein WL, Vaughan DE, Dong H. Pharmacological inhibition of plasminogen activator inhibitor-1 prevents memory deficits and reduces neuropathology in APP/PS1 mice. Psychopharmacology (Berl) 2023; 240:2641-2655. [PMID: 37700086 DOI: 10.1007/s00213-023-06459-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 08/28/2023] [Indexed: 09/14/2023]
Abstract
RATIONALE Extracellular proteolytic activity plays an important role in memory formation and the preservation of cognitive function. Previous studies have shown increased levels of plasminogen activator inhibitor-1 (PAI-1) in the brain of mouse models of Alzheimer's disease (AD) and plasma of AD patients, associated with memory and cognitive decline; however, the exact function of PAI-1 in AD onset and progression is largely unclear. OBJECTIVE In this study, we evaluated a novel PAI-1 inhibitor, TM5A15, on its ability to prevent or reverse memory deficits and decrease Aβ levels and plaque deposition in APP/PS1 mice. METHODS We administered TM5A15 mixed in a chow diet to 3-month and 9-month-old APP/PS1 mice before and after neuropathological changes were distinguishable. We then evaluated the effects of TM5A15 on memory function and neuropathology at 9 months and 18 months of age. RESULTS In the younger mice, 6 months of TM5A15 treatment protected against recognition and short-term working memory impairment. TM5A15 also decreased oligomer levels and amyloid plaques, and increased mBDNF expression in APP/PS1 mice at 9 months of age. In aged mice, 9 months of TM5A15 treatment did not significantly improve memory function nor decrease amyloid plaques. However, TM5A15 treatment showed a trend in decreasing oligomer levels in APP/PS1 mice at 18 months of age. CONCLUSION Our results suggest that PAI-1 inhibition could improve memory function and reduce the accumulation of amyloid levels in APP/PS1 mice. Such effects are more prominent when TM5A15 is administered before advanced AD pathology and memory deficits occur.
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Affiliation(s)
- Guadalupe Rodriguez
- Department of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, 303 East Chicago Avenue, Ward 7-103, Chicago, IL, 60611, USA
| | - Mesut Eren
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA
| | - Isabel Haupfear
- Department of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, 303 East Chicago Avenue, Ward 7-103, Chicago, IL, 60611, USA
| | - Kirsten L Viola
- Department of Neurobiology, Northwestern University, 2205 Tech Drive, Hogan 4-160, Evanston, IL, 60208, USA
| | - Erika N Cline
- Department of Neurobiology, Northwestern University, 2205 Tech Drive, Hogan 4-160, Evanston, IL, 60208, USA
| | - Toshio Miyata
- Department of Molecular Medicine and Therapy, United Centers for Advanced Research and Translational Medicine, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - William L Klein
- Department of Neurobiology, Northwestern University, 2205 Tech Drive, Hogan 4-160, Evanston, IL, 60208, USA
| | - Douglas E Vaughan
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA
| | - Hongxin Dong
- Department of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, 303 East Chicago Avenue, Ward 7-103, Chicago, IL, 60611, USA.
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James AW, Bahader GA, Albassan M, Shah ZA. The ER chaperone, BIP protects Microglia from ER stress-mediated Apoptosis in Hyperglycemia. Neurochem Int 2023; 169:105573. [PMID: 37454816 PMCID: PMC10528316 DOI: 10.1016/j.neuint.2023.105573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 06/27/2023] [Accepted: 07/07/2023] [Indexed: 07/18/2023]
Abstract
A major endoplasmic reticulum (ER) chaperone, binding of Immunoglobulin heavy chain protein (BIP) facilitates the assembly of newly synthesized proteins in the ER. Microglia vigorously respond to brain injuries and eliminate the damaged neuronal and apoptotic cells through phagocytosis in the central nervous system. However, the mechanism of BIP-mediated microglial function is not clear in hyperglycemia. We explored the molecular mechanism of BIP in microglial function during hyperglycemic conditions. Hyperglycemia was induced in mice by two consecutive intraperitoneal injections of streptozotocin (STZ 100/kg) and confirmed by measuring the blood glucose from day 2 to day 14. After 14 days of experimental hyperglycemia, mice were sacrificed and brains were collected for ER chaperone expression. In-vitro hyperglycemia was induced by exposing HMC3 cells to 25 mM glucose for 5 days and proteins involved in ER stress, apoptosis, and autophagy were analyzed. In hyperglycemic conditions, BIP protein expression was dramatically reduced in HMC3 cells, which led to increased apoptosis through the activation of CHOP and mitochondrial pro-apoptotic proteins (Bax, Bad, and cleaved caspase-3). The flow cytometry results indicate hyperglycemia-induced apoptosis and reactive oxygen species (ROS) production. Interestingly, the BIP inducer X restored the apoptosis in HMC3 cells by derepressing BIP expression and inhibiting ER stress. These results suggest that the ER chaperone BIP is required for the microglial function and protects from apoptosis in hyperglycemia. A better understanding of BIP's molecular mechanism and role in microglial function may contribute to developing novel therapies for microglia dysfunction-associated neurodegenerative diseases.
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Affiliation(s)
- Antonisamy William James
- Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, Toledo, OH, USA
| | - Ghaith A Bahader
- Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, Toledo, OH, USA
| | - Mohammad Albassan
- Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, Toledo, OH, USA
| | - Zahoor A Shah
- Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, Toledo, OH, USA.
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4
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Nong X, Li N, Wang X, Li H, Wu X, Li M, Hao W, Yang G. TRIM62 knockdown by inhibiting the TLR4/NF-κB pathway and NLRP3 inflammasome attenuates cognitive impairment induced by diabetes in mice. J Clin Biochem Nutr 2023; 73:131-137. [PMID: 37700852 PMCID: PMC10493211 DOI: 10.3164/jcbn.22-104] [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: 09/26/2022] [Accepted: 04/26/2023] [Indexed: 09/14/2023] Open
Abstract
The tripartite motif 62 is an E3 ubiquitin ligase protein that regulates cellular processes, including differentiation, immunity, development and apoptosis, leading to various disease states, such as cancer and inflammatory diseases. However, the role and mechanism of the tripartite motif 62 in the process of diabetic-induced cognitive impairment have not been reported. Therefore, the aim of this study was to investigate the role and mechanism of the tripartite motif 62 in diabetic-induced cognitive impairment. The results showed that the expression of the tripartite motif 62 was up-regulated in diabetic mice. Silencing of TRIM62 increased body weight and decreased fasting blood glucose in diabetic mice. In addition, knockdown of the tripartite motif 62 inhibited STZ-induced inflammation, apoptosis and oxidative stress. Further studies showed that the TLR4/NF-κB pathway and NLRP3 inflammasomes were involved in the regulation of diabetic mice by the tripartite motif 62. More importantly, inhibition of the tripartite motif 62 improved cognitive impairment and learning ability in mice. In conclusion, inhibition of TRIM62 inhibits STZ-induced inflammation, cell apoptosis and oxidative stress, and improves the cognitive ability of mice. Therefore, the tripartite motif 62 may be an important target for the treatment of diabetes-induced cognitive impairment.
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Affiliation(s)
- Xiting Nong
- Department of Endocrinology, The Affiliated Xi’an Central Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710004, China
| | - Nan Li
- Department of Endocrinology, The Affiliated Xi’an Central Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710004, China
| | - Xiang Wang
- Department of Endocrinology, The Affiliated Xi’an Central Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710004, China
| | - Heng Li
- Department of Endocrinology, The Affiliated Xi’an Central Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710004, China
| | - Xiaoping Wu
- Department of Radiology, The Affiliated Xi’an Central Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710004, China
| | - Ming Li
- Department of Endocrinology, The Affiliated Xi’an Central Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710004, China
| | - Wenqing Hao
- Department of Endocrinology, The Affiliated Xi’an Central Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710004, China
| | - Guang Yang
- Department of Cardiology, Shaanxi Provincial People’s Hospital, 256 West Youyi Road, Xi’an, Shaanxi 710068, China
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Obradovic M, Zafirovic S, Gluvic Z, Radovanovic J, Isenovic ER. Autophagy and diabetes. EXPLORATION OF MEDICINE 2023:576-588. [DOI: 10.37349/emed.2023.00162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 05/29/2023] [Indexed: 10/13/2023] Open
Abstract
The current literature findings on autophagy’s beneficial and detrimental roles in diabetes mellitus (DM) and diabetes-related comorbidities were reviewed. The effects of oral hypoglycaemic medicines and autophagy in DM. Autophagy plays an important function in cellular homeostasis by promoting cell survival or initiating cell death in physiological settings was also assessed. Although autophagy protects insulin-target tissues, organelle failure caused by autophagy malfunction influences DM and other metabolic diseases. Endoplasmic reticulum and oxidative stress enhance autophagy levels, making it easier to regulate stress-induced intracellular changes. Evidence suggests that autophagy-caused cell death can occur when autophagy is overstimulated and constitutively activated, which might prevent or develop DM. Even though the precise role of autophagy in DM complications is uncertain, deregulation of the autophagic machinery is strongly linked to beta cell destruction and the aetiology of DM. Thus, improving autophagy dysfunction is a possible therapeutic objective in treating DM and other metabolic disorders.
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Affiliation(s)
- Milan Obradovic
- Department of Radiobiology and Molecular Genetics, VINČA Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia
| | - Sonja Zafirovic
- Department of Radiobiology and Molecular Genetics, VINČA Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia
| | - Zoran Gluvic
- Department of Endocrinology and Diabetes, Zemun Clinical Hospital, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
| | - Jelena Radovanovic
- Department of Radiobiology and Molecular Genetics, VINČA Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia
| | - Esma R. Isenovic
- Department of Radiobiology and Molecular Genetics, VINČA Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia
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Boukhalfa W, Jmel H, Kheriji N, Gouiza I, Dallali H, Hechmi M, Kefi R. Decoding the genetic relationship between Alzheimer's disease and type 2 diabetes: potential risk variants and future direction for North Africa. Front Aging Neurosci 2023; 15:1114810. [PMID: 37342358 PMCID: PMC10277480 DOI: 10.3389/fnagi.2023.1114810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 04/11/2023] [Indexed: 06/22/2023] Open
Abstract
Introduction Alzheimer's disease (AD) and Type 2 diabetes (T2D) are both age-associated diseases. Identification of shared genes could help develop early diagnosis and preventive strategies. Although genetic background plays a crucial role in these diseases, we noticed an underrepresentation tendency of North African populations in omics studies. Materials and methods First, we conducted a comprehensive review of genes and pathways shared between T2D and AD through PubMed. Then, the function of the identified genes and variants was investigated using annotation tools including PolyPhen2, RegulomeDB, and miRdSNP. Pathways enrichment analyses were performed with g:Profiler and EnrichmentMap. Next, we analyzed variant distributions in 16 worldwide populations using PLINK2, R, and STRUCTURE software. Finally, we performed an inter-ethnic comparison based on the minor allele frequency of T2D-AD common variants. Results A total of 59 eligible papers were included in our study. We found 231 variants and 363 genes shared between T2D and AD. Variant annotation revealed six single nucleotide polymorphisms (SNP) with a high pathogenic score, three SNPs with regulatory effects on the brain, and six SNPs with potential effects on miRNA-binding sites. The miRNAs affected were implicated in T2D, insulin signaling pathways, and AD. Moreover, replicated genes were significantly enriched in pathways related to plasma protein binding, positive regulation of amyloid fibril deposition, microglia activation, and cholesterol metabolism. Multidimensional screening performed based on the 363 shared genes showed that main North African populations are clustered together and are divergent from other worldwide populations. Interestingly, our results showed that 49 SNP associated with T2D and AD were present in North African populations. Among them, 11 variants located in DNM3, CFH, PPARG, ROHA, AGER, CLU, BDNF1, CST9, and PLCG1 genes display significant differences in risk allele frequencies between North African and other populations. Conclusion Our study highlighted the complexity and the unique molecular architecture of North African populations regarding T2D-AD shared genes. In conclusion, we emphasize the importance of T2D-AD shared genes and ethnicity-specific investigation studies for a better understanding of the link behind these diseases and to develop accurate diagnoses using personalized genetic biomarkers.
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Affiliation(s)
- Wided Boukhalfa
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, Tunis, Tunisia
- Tunis El Manar University, Tunis, Tunisia
- Faculty of Medicine of Tunis, Tunis, Tunisia
| | - Haifa Jmel
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, Tunis, Tunisia
- Tunis El Manar University, Tunis, Tunisia
| | - Nadia Kheriji
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, Tunis, Tunisia
- Tunis El Manar University, Tunis, Tunisia
- Faculty of Medicine of Tunis, Tunis, Tunisia
| | - Ismail Gouiza
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, Tunis, Tunisia
- Tunis El Manar University, Tunis, Tunisia
- Faculty of Medicine of Tunis, Tunis, Tunisia
- University of Angers, MitoLab Team, Unité MitoVasc, UMR CNRS 6015, INSERM U1083, SFR ICAT, Angers, France
| | - Hamza Dallali
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, Tunis, Tunisia
- Tunis El Manar University, Tunis, Tunisia
| | - Mariem Hechmi
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, Tunis, Tunisia
- Tunis El Manar University, Tunis, Tunisia
| | - Rym Kefi
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, Tunis, Tunisia
- Tunis El Manar University, Tunis, Tunisia
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7
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Shapiro ALB, Bellatorre A, Dabelea D, Stafford JM, D'Agostino R, Shah AS, Urbina EM, Barrett CE, Pihoker C, Marcovina S, Liese AD, Mottl AK, Jensen ET, Wilkening G. Diabetes complications and cognitive function in young adults with youth-onset type 1 or type 2 diabetes: the SEARCH for Diabetes in Youth Study. Pediatr Diabetes 2023; 2023:4860831. [PMID: 38706530 PMCID: PMC11068325 DOI: 10.1155/2023/4860831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/07/2024] Open
Abstract
Aims/hypotheses People with type 1 (T1D) or type 2 diabetes (T2D) who also have diabetes complications can have pronounced cognitive deficits. It remains unknown, however, whether and how multiple diabetes complications co-occur with cognitive dysfunction, particularly in youth-onset diabetes. Methods Using data from the SEARCH for Diabetes in Youth study cohort, a prospective longitudinal cohort, we examined clustering of complications and their underlying clinical factors with performance on cognitive tests in young adults with youth-onset T1D or T2D. Cognition was assessed via the NIH Toolbox Cognition Battery. The main cognitive variables were age-corrected scores for composite fluid cognition and associated cognitive subdomains. Diabetes complications included retinopathy, microalbuminuria, and peripheral neuropathy (PN). Lipids, systolic blood pressure (SBP), hemoglobin A1c, and other clinical factors were included in the analyses. Clustering was applied separately to each group (T1D=646; T2D=165). A three-cluster(C) solution was identified for each diabetes type. Mean values and frequencies of all factors were compared between resulting clusters. Results The average age-corrected score for composite fluid cognition differed significantly across clusters for each group (p<0.001). People with T1D and the lowest average fluid cognition scores had the highest frequency of self-reporting at least one episode of hypoglycemia in the year preceding cognitive testing and the highest prevalence of PN. Persons with T2D and the lowest average fluid cognition scores had the highest SBP, the highest central systolic and diastolic blood pressures, and highest prevalence of PN. Conclusions/interpretations These findings highlight shared (PN) and unique factors (hypoglycemia in T1D; SBP in T2D) that could be targeted to potentially mitigate cognitive issues in young people with youth-onset diabetes.
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Affiliation(s)
- Allison L B Shapiro
- Department of Pediatrics, School of Medicine, University of Colorado Anschutz Medical Campus
- Lifecourse Epidemiology of Adiposity and Diabetes (LEAD) Center, University of Colorado Anschutz Medical Campus
| | - Anna Bellatorre
- Lifecourse Epidemiology of Adiposity and Diabetes (LEAD) Center, University of Colorado Anschutz Medical Campus
| | - Dana Dabelea
- Department of Pediatrics, School of Medicine, University of Colorado Anschutz Medical Campus
- Lifecourse Epidemiology of Adiposity and Diabetes (LEAD) Center, University of Colorado Anschutz Medical Campus
- Department of Epidemiology, Colorado School of Public Health, University of Colorado Anschutz Medical Campus
| | | | - Ralph D'Agostino
- Department of Biostatistics and Data Science, Wake Forest University
| | - Amy S Shah
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati
| | - Elaine M Urbina
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati
| | - Catherine E Barrett
- Division of Diabetes Translation, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention
| | | | - Santica Marcovina
- Division of Metabolism, Endocrinology and Nutrition, Department of Medicine, University of Washington
| | - Angela D Liese
- Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina
| | - Amy K Mottl
- University of North Carolina Kidney Center, Division of Nephrology and Hypertension, Department of Medicine, University of North Carolina, Chapel Hill
| | - Elizabeth T Jensen
- Department of Epidemiology and Prevention, Public Health Sciences, Wake Forest University
| | - Greta Wilkening
- Department of Pediatrics, School of Medicine, University of Colorado Anschutz Medical Campus
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Duarte JV, Guerra C, Moreno C, Gomes L, Castelo-Branco M. Changes in hemodynamic response function components reveal specific changes in neurovascular coupling in type 2 diabetes. Front Physiol 2023; 13:1101470. [PMID: 36703928 PMCID: PMC9872943 DOI: 10.3389/fphys.2022.1101470] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 12/12/2022] [Indexed: 01/11/2023] Open
Abstract
Type 2 Diabetes Mellitus (T2DM) is a metabolic disease that leads to multiple vascular complications with concomitant changes in human neurophysiology, which may lead to long-term cognitive impairment, and dementia. Early impairments of neurovascular coupling can be studied using event-related functional magnetic resonance imaging (fMRI) designs. Here, we aimed to characterize the changes in the hemodynamic response function (HRF) in T2DM to probe components from the initial dip to late undershoot. We investigated whether the HRF morphology is altered throughout the brain in T2DM, by extracting several parameters of the fMRI response profiles in 141 participants (64 patients with T2DM and 77 healthy controls) performing a visual motion discrimination task. Overall, the patients revealed significantly different HRFs, which extended to all brain regions, suggesting that this is a general phenomenon. The HRF in T2DM was found to be more sluggish, with a higher peak latency and lower peak amplitude, relative slope to peak, and area under the curve. It also showed a pronounced initial dip, suggesting that the initial avidity for oxygen is not compensated for, and an absent or less prominent but longer undershoot. Most HRF parameters showed a higher dispersion and variability in T2DM. In sum, we provide a definite demonstration of an impaired hemodynamic response function in the early stages of T2DM, following a previous suggestion of impaired neurovascular coupling. The quantitative demonstration of a significantly altered HRF morphology in separate response phases suggests an alteration of distinct physiological mechanisms related to neurovascular coupling, which should be considered in the future to potentially halt the deterioration of the brain function in T2DM.
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Affiliation(s)
- João Valente Duarte
- Coimbra Institute for Biomedical Imaging and Translational Research (CIBIT), Institute for Nuclear Sciences Applied to Health (ICNAS), University of Coimbra, Coimbra, Portugal,Faculty of Medicine, University of Coimbra, Coimbra, Portugal,Intelligent Systems Associate Laboratory (LASI), Coimbra, Portugal
| | - Catarina Guerra
- Coimbra Institute for Biomedical Imaging and Translational Research (CIBIT), Institute for Nuclear Sciences Applied to Health (ICNAS), University of Coimbra, Coimbra, Portugal
| | - Carolina Moreno
- Service of Endocrinology, Diabetes and Metabolism, Coimbra University Hospital, Coimbra, Portugal
| | - Leonor Gomes
- Service of Endocrinology, Diabetes and Metabolism, Coimbra University Hospital, Coimbra, Portugal
| | - Miguel Castelo-Branco
- Coimbra Institute for Biomedical Imaging and Translational Research (CIBIT), Institute for Nuclear Sciences Applied to Health (ICNAS), University of Coimbra, Coimbra, Portugal,Faculty of Medicine, University of Coimbra, Coimbra, Portugal,Intelligent Systems Associate Laboratory (LASI), Coimbra, Portugal,*Correspondence: Miguel Castelo-Branco,
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Low molecular weight fucoidan alleviates cerebrovascular damage by promoting angiogenesis in type 2 diabetes mice. Int J Biol Macromol 2022; 217:345-355. [PMID: 35841956 DOI: 10.1016/j.ijbiomac.2022.07.053] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 07/06/2022] [Accepted: 07/07/2022] [Indexed: 12/11/2022]
Abstract
Diabetes leading to brain glucose metabolism disorders and cerebrovascular complications. Fucoidan is a kind of sulfated polysaccharides which found in brown algae, has multiply bioactivities and considered to be a promising therapeutic agent. Despite the increasing amount of evidence suggesting the diabetes protective role of fucoidans, the effect of fucoidan on brain abnormalities in type 2 diabetes mellitus patients remains unclear. In this study a low molecular weight fucoidan (LMWF) was obtained from Saccharina japonica and its effect on the cerebrovascular damage in db/db mice was investigated. Results were shown after LMWF treatment, the degree of cerebrovascular damage, the number of apoptotic neuronal cells and the inflammation were all decreased in db/db mice. Moreover, LMWF could up-regulates CD34 and VEGFA expression in db/db mice brain, and the subintestinal vessel angiogenesis in zebrafish was also promoted by LMWF. Moreover, the lumen formation of HUVEC endothelial cells was rescued by LMWF which was destroyed in high glucose treated endothelial cells. Further study found, LMWF alleviates vascular injury by up-regulating the expression level of phosphorylated PI3K and phosphorylated AKT. Our study indicates that LMWF has the potential to develop a cerebrovascular protection agent for type 2 diabetes patients.
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10
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Tian X, Zuo Y, Chen S, Zhang Y, Zhang X, Xu Q, Wu S, Wang A. Hypertension, Arterial Stiffness, and Diabetes: a Prospective Cohort Study. Hypertension 2022; 79:1487-1496. [PMID: 35574838 PMCID: PMC9172905 DOI: 10.1161/hypertensionaha.122.19256] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Whether the combination of different blood pressure and arterial stiffness (AS) status is independently associated with diabetes has not been fully investigated so far. This study aimed at investigating the status of hypertension and AS in determining diabetes.
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Affiliation(s)
- Xue Tian
- Department of Neurology (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China.,China National Clinical Research Center for Neurological Diseases (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China.,Department of Epidemiology and Health Statistics, School of Public Health, Capital Medical University, Beijing, China (X.T., Y.Z.).,Beijing Municipal Key Laboratory of Clinical Epidemiology, China (X.T., Y.Z.)
| | - Yingting Zuo
- Department of Neurology (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China.,China National Clinical Research Center for Neurological Diseases (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China.,Department of Epidemiology and Health Statistics, School of Public Health, Capital Medical University, Beijing, China (X.T., Y.Z.).,Beijing Municipal Key Laboratory of Clinical Epidemiology, China (X.T., Y.Z.)
| | - Shuohua Chen
- Department of Cardiology, Kailuan Hospital, North China University of Science and Technology, Tangshan, China (S.C., S.W.)
| | - Yijun Zhang
- Department of Neurology (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China.,China National Clinical Research Center for Neurological Diseases (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China
| | - Xiaoli Zhang
- Department of Neurology (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China.,China National Clinical Research Center for Neurological Diseases (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China
| | - Qin Xu
- Department of Neurology (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China.,China National Clinical Research Center for Neurological Diseases (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China
| | - Shouling Wu
- Department of Cardiology, Kailuan Hospital, North China University of Science and Technology, Tangshan, China (S.C., S.W.)
| | - Anxin Wang
- Department of Neurology (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China.,China National Clinical Research Center for Neurological Diseases (X.T., Y.Z., Y.Z., X.Z., Q.X., A.W.), Beijing Tiantan Hospital, Capital Medical University, China
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11
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Wang S, Jiao F, Border JJ, Fang X, Crumpler RF, Liu Y, Zhang H, Jefferson J, Guo Y, Elliott PS, Thomas KN, Strong LB, Urvina AH, Zheng B, Rijal A, Smith SV, Yu H, Roman RJ, Fan F. Luseogliflozin, a sodium-glucose cotransporter-2 inhibitor, reverses cerebrovascular dysfunction and cognitive impairments in 18-mo-old diabetic animals. Am J Physiol Heart Circ Physiol 2022; 322:H246-H259. [PMID: 34951541 PMCID: PMC8759958 DOI: 10.1152/ajpheart.00438.2021] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 11/29/2021] [Accepted: 12/15/2021] [Indexed: 02/03/2023]
Abstract
Diabetes mellitus (DM) is a leading risk factor for age-related dementia, but the mechanisms involved are not well understood. We previously discovered that hyperglycemia induced impaired myogenic response (MR) and cerebral blood flow (CBF) autoregulation in 18-mo-old DM rats associated with blood-brain barrier (BBB) leakage, impaired neurovascular coupling, and cognitive impairment. In the present study, we examined whether reducing plasma glucose with a sodium-glucose cotransporter-2 inhibitor (SGLT2i) luseogliflozin can ameliorate cerebral vascular and cognitive function in diabetic rats. Plasma glucose and HbA1c levels of 18-mo-old DM rats were reduced, and blood pressure was not altered after treatment with luseogliflozin. SGLT2i treatment restored the impaired MR of middle cerebral arteries (MCAs) and parenchymal arterioles and surface and deep cortical CBF autoregulation in DM rats. Luseogliflozin treatment also rescued neurovascular uncoupling, reduced BBB leakage and cognitive deficits in DM rats. However, SGLT2i did not have direct constrictive effects on vascular smooth muscle cells and MCAs isolated from normal rats, although it decreased reactive oxygen species production in cerebral vessels of DM rats. These results provide evidence that normalization of hyperglycemia with an SGLT2i can reverse cerebrovascular dysfunction and cognitive impairments in rats with long-standing hyperglycemia, possibly by ameliorating oxidative stress-caused vascular damage.NEW & NOTEWORTHY This study demonstrates that luseogliflozin, a sodium-glucose cotransporter-2 inhibitor, improved CBF autoregulation in association with reduced vascular oxidative stress and AGEs production in the cerebrovasculature of 18-mo-old DM rats. SGLT2i also prevented BBB leakage, impaired functional hyperemia, neurodegeneration, and cognitive impairment seen in DM rats. Luseogliflozin did not have direct constrictive effects on VSMCs and MCAs isolated from normal rats. These results provide evidence that normalization of hyperglycemia with an SGLT2i can reverse cerebrovascular dysfunction and cognitive impairments in rats with long-standing hyperglycemia, possibly by ameliorating oxidative stress-caused vascular damage.
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Affiliation(s)
- Shaoxun Wang
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Feng Jiao
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Jane J Border
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Xing Fang
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Reece F Crumpler
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Yedan Liu
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Huawei Zhang
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Joshua Jefferson
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Ya Guo
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Parker S Elliott
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Kirby N Thomas
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Luke B Strong
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Austin H Urvina
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Baoying Zheng
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Arjun Rijal
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Stanley V Smith
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Hongwei Yu
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Richard J Roman
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Fan Fan
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
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12
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Frank CJ, McNay EC. Breakdown of the blood-brain barrier: A mediator of increased Alzheimer's risk in patients with metabolic disorders? J Neuroendocrinol 2022; 34:e13074. [PMID: 34904299 PMCID: PMC8791015 DOI: 10.1111/jne.13074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 11/12/2021] [Accepted: 11/26/2021] [Indexed: 01/03/2023]
Abstract
Metabolic disorders (MDs), including type 1 and 2 diabetes and chronic obesity, are among the faster growing diseases globally and are a primary risk factor for Alzheimer's disease (AD). The term "type-3 diabetes" has been proposed for AD due to the interrelated cellular, metabolic, and immune features shared by diabetes, insulin resistance (IR), and the cognitive impairment and neurodegeneration found in AD. Patients with MDs and/or AD commonly exhibit altered glucose homeostasis and IR; systemic chronic inflammation encompassing all of the periphery, blood-brain barrier (BBB), and central nervous system; pathological vascular remodeling; and increased BBB permeability that allows transfusion of neurotoxic molecules from the blood to the brain. This review summarizes the components of the BBB, mechanisms through which MDs alter BBB permeability via immune and metabolic pathways, the contribution of BBB dysfunction to the manifestation and progression of AD, and current avenues of therapeutic research that address BBB permeability. In addition, issues with the translational applicability of current animal models of AD regarding BBB dysfunction and proposals for future directions of research that address the relationship between MDs, BBB dysfunction, and AD are discussed.
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Affiliation(s)
- Corey J Frank
- Behavioral Neuroscience, University at Albany, SUNY, Albany, NY, USA
| | - Ewan C McNay
- Behavioral Neuroscience, University at Albany, SUNY, Albany, NY, USA
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13
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Meng J, Zhu Y, Ma H, Wang X, Zhao Q. The role of traditional Chinese medicine in the treatment of cognitive dysfunction in type 2 diabetes. JOURNAL OF ETHNOPHARMACOLOGY 2021; 280:114464. [PMID: 34329715 DOI: 10.1016/j.jep.2021.114464] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 07/04/2021] [Accepted: 07/24/2021] [Indexed: 06/13/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Diabetic cognitive dysfunction (DCD) is mainly one of the complications of type 2 diabetes mellitus (T2DM) with complex and obscure pathogenesis. Extensive evidence has demonstrated the effectiveness and safety of traditional Chinese medicine (TCM) for DCD management. AIM OF THE STUDY This review attempted to systematically summarize the possible pathogenesis of DCD and the current Chinese medicine on the treatment of DCD. MATERIALS AND METHODS We acquired information of TCM on DCD treatment from PubMed, Web of Science, Science Direct and CNKI databases. We then dissected the potential mechanisms of currently reported TCMs and their active ingredients for the treatment of DCD by discussing the deficiencies and giving further recommendations. RESULTS Most TCMs and their active ingredients could improve DCD through alleviating insulin resistance, microvascular dysfunction, abnormal gut microbiota composition, inflammation, and the damages of the blood-brain barrier, cerebrovascular and neurons under hyperglycemia conditions. CONCLUSIONS TCM is effective in the treatment of DCD with few adverse reactions. A large number of in vivo and in vitro, and clinical trials are still needed to further reveal the potential quality markers of TCM on DCD treatment.
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Affiliation(s)
- Jinni Meng
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Ningxia, China
| | - Yafei Zhu
- College of Basic Medicine, Ningxia Medical University, Ningxia, China
| | - Huixia Ma
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Ningxia, China
| | - Xiaobo Wang
- State Key Laboratory of Southwestern Chinese Medicine Resources, Innovative Institute of Chinese Medicine and Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China.
| | - Qipeng Zhao
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Ningxia, China; Key Laboratory of Hui Ethnic Medicine Modernization, Ministry of Education, Ningxia Medical University, Ningxia, China.
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14
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Tanashyan MM, Surkova EV, Antonova KV, Lagoda OV, Naminov AV, Berdnikovich ES, Fedin PA, Titkova II. Type 2 diabetes and cognitive functions in patients with chronic cerebrovascular diseases. TERAPEVT ARKH 2021; 93:1179-1185. [DOI: 10.26442/00403660.2021.10.201108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 11/04/2021] [Indexed: 11/22/2022]
Abstract
Background. Type 2 diabetes (Т2DM) both directly and indirectly impacts the development of morphological and functional changes of the central nervous system.
Aim. The study was to determine clinical and neurophysiological patterns of cognitive impairment (CI) in patients with chronic cerebrovascular diseases (CCD) and Т2DM.
Materials and methods. We examined 132 patients with CCD. First group included 58 patients without Т2DM aged 64.5 [58; 72], second group 74 patients with CCD and Т2DM 63 [57; 70]. Clinical, neurological, neuropsychological, neurophysiological (cognitive evoked potentials (EP) and neurovisualisation (brain MRI) examination was carried out to all patients.
Results. Somatic and neurological characteristics of the patients were similar in both groups with the exception of more distinct metabolic changes in Т2DM patients. Neurovisualisation study of the brain MRI in Т2DM patients revealed more distinct changes in the form of white matter hyperintensity and subarachnoidal spaces enlargement. Neuropsychological examination in patients revealed the reduction of intellectual flexibility, constructive praxis disruption, optical spatial dysfunction and deteoration of delayed word recall. Significant disorders in the way of overall cognitive impairment, lobar dysfunction and impaired verbal associative productivity, proved by statistically lower amplitude and higher latency of P300 EP peak were noted in Т2DM patients. Correlation links were detected: for P300 amplitude and direct and inverse number listing test (r=0.366 and r=0.520; p=0.006 and p0.001 respectively); P300 latency and HbA1c (r=0.32; р0.05) in group 2 and glucose levels in both groups (r=0.30; p0.05); inverse relationship of latency with control functions evaluation (r=-0.34; p=0.008).
Conclusion. CCD especially with Т2DM manifests with neurocognitive imbalance, including control functions disruption and are accompanied by neurophysiological and neurovisualistion changes.
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15
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Pickering J, Wong R, Al-Salami H, Lam V, Takechi R. Cognitive Deficits in Type-1 Diabetes: Aspects of Glucose, Cerebrovascular and Amyloid Involvement. Pharm Res 2021; 38:1477-1484. [PMID: 34480263 DOI: 10.1007/s11095-021-03100-1] [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: 06/05/2021] [Accepted: 08/24/2021] [Indexed: 11/28/2022]
Abstract
The evidence shows that individuals with type-1 diabetes mellitus (T1DM) are at greater risk of accelerated cognitive impairment and dementia. Although, to date the mechanisms are largely unknown. An emerging body of literature indicates that dysfunction of cerebral neurovascular network and plasma dyshomeostasis of soluble amyloid-β in association with impaired lipid metabolism are central to the onset and progression of cognitive deficits and dementia. However, the latter has not been extensively considered in T1DM. Therefore, in this review, we summarised the literature concerning altered lipid metabolism and cerebrovascular function in T1DM as an implication for potential pathways leading to cognitive decline and dementia.
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Affiliation(s)
- Justin Pickering
- School of Population Health, Faculty of Health Sciences, Curtin University, Perth, WA, 6845, Australia
| | - Rachel Wong
- Institute for Resilient Regions, University of Southern Queensland, Springfield Central, QLD, 4300, Australia
| | - Hani Al-Salami
- Curtin Medical School, Faculty of Health Sciences, Curtin University, Perth, WA, 6845, Australia.,Curtin Health Innovation Research Institute, Curtin University, Perth, WA, 6845, Australia
| | - Virginie Lam
- School of Population Health, Faculty of Health Sciences, Curtin University, Perth, WA, 6845, Australia.,Curtin Medical School, Faculty of Health Sciences, Curtin University, Perth, WA, 6845, Australia
| | - Ryu Takechi
- School of Population Health, Faculty of Health Sciences, Curtin University, Perth, WA, 6845, Australia. .,Curtin Medical School, Faculty of Health Sciences, Curtin University, Perth, WA, 6845, Australia.
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16
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Jiang Y, Han J, Spencer P, Li Y, Vodovoz SJ, Ning MM, Liu N, Wang X, Dumont AS. Diabetes mellitus: A common comorbidity increasing hemorrhagic transformation after tPA thrombolytic therapy for ischemic stroke. BRAIN HEMORRHAGES 2021. [DOI: 10.1016/j.hest.2020.11.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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17
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Li X, Yin Q, Han X, Zhang H, Wang F, Ma J, Zhuang P, Zhang Y. Dynamic expression of vascular endothelial growth factor (VEGF) and platelet-derived growth factor receptor beta (PDGFRβ) in diabetic brain contributes to cognitive dysfunction. Brain Res Bull 2021; 175:99-106. [PMID: 34303767 DOI: 10.1016/j.brainresbull.2021.07.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Revised: 07/18/2021] [Accepted: 07/19/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND Cognitive dysfunction is increasingly recognized as an important complication of diabetes mellitus (DM). Accumulating evidence indicates that the abnormality of cerebrovascular structure and function plays an essential role in diabetic cognitive impairment (DCI), however, changes in cerebrovascular factors have been blurred during the development of diabetes. OBJECTIVE To evaluate the changes in the structure and function of cerebrovascular in DCI mice and to investigate the changes of cerebral angiogenesis and stability factors during the development of DM. METHODS Diabetes was induced by feeding with high-fat diet combined with intraperitoneal injection of streptozotocin (STZ,120 mg/kg). Cognitive function was evaluated at different stages of DM, cerebral neovascularization, blood-brain barrier (BBB) permeability and hippocampal neurons were measured of DCI mice, and the expression of vascular endothelial growth factor (VEGF) and platelet-derived growth factor receptor β (PDGFRβ) in hippocampus was detected during the development of DM. RESULTS With the progress of diabetes, the learning and memory ability of mice gradually decreased, and DCI mice showed neuronal degeneration, increased BBB permeability and pathological cerebral neovascularization. Moreover, the expression of VEGF in the hippocampus increased first and then decreased at DM+8week, PDGFRβ decreased continuously with the development of diabetes. CONCLUSIONS Our results demonstrate that DCI may be attributed to the dynamic expression of VEGF/PDGFRβ in diabetic hippocampus, and pathological cerebral neovascularization, increased BBB permeability and neuronal degeneration are the key links.
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Affiliation(s)
- Xueli Li
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China
| | - Qingsheng Yin
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China
| | - Xu Han
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China
| | - Hanyu Zhang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China
| | - Fang Wang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China
| | - Jing Ma
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China
| | - Pengwei Zhuang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China; Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China.
| | - Yanjun Zhang
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China.
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18
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MacIntosh BJ, Cohen E, Colby-Milley J, Fang J, Zhou L, Ouk M, Wu CY, Shah BR, Lanctôt K, Herrmann N, Linkewich E, Law M, Black SE, Swartz RH, Kapral MK, Edwards JD, Swardfager W. Diabetes Mellitus Is Associated With Poor In-Hospital and Long-Term Outcomes in Young and Midlife Stroke Survivors. J Am Heart Assoc 2021; 10:e019991. [PMID: 34219470 PMCID: PMC8483482 DOI: 10.1161/jaha.120.019991] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background The incidence of ischemic stroke has increased among adults aged 18 to 64 years, yet little is known about relationships between specific risk factors and outcomes. This study investigates in-hospital and long-term outcomes in patients with stroke aged <65 years with preexisting diabetes mellitus. Methods and Results Consecutive patients aged <65 years admitted to comprehensive stroke centers for acute ischemic stroke between 2003 and 2013 were identified from the Ontario Stroke Registry. Multinomial logistic regression was used to estimate adjusted odds ratio (OR [95% CI]) of in-hospital mortality or direct discharge to long-term or continuing care. Cox proportional hazards regression was used to estimate the adjusted hazards ratio (aHR [95% CI]) of long-term mortality, readmission for stroke/transient ischemic attack, admission to long-term care, and incident dementia. Predefined sensitivity analyses examined stroke outcomes among young (aged 18-49 years) and midlife (aged 50-65 years) subgroups. Among 8293 stroke survivors (mean age, 53.6±8.9 years), preexisting diabetes mellitus was associated with a higher likelihood of in-hospital death (adjusted OR, 1.46 [95% CI, 1.14-1.87]) or direct discharge to long-term care (adjusted OR, 1.65 [95% CI, 1.07-2.54]). Among stroke survivors discharged (N=7847) and followed up over a median of 6.3 years, preexisting diabetes mellitus was associated with increased hazards of death (aHR, 1.68 [95% CI, 1.50-1.88]), admission to long-term care (aHR, 1.57 [95% CI, 1.35-1.82]), readmission for stroke/transient ischemic attack (aHR, 1.37 [95% CI, 0.21-1.54]), and incident dementia (aHR, 1.44 [95% CI, 1.17-1.77]). Only incident dementia was not increased for young stroke survivors. Conclusions Focused secondary prevention and risk factor management may be needed to address poor long-term outcomes for patients with stroke aged <65 years with preexisting diabetes mellitus.
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Affiliation(s)
- Bradley J MacIntosh
- Hurvitz Brain Sciences ProgramSunnybrook Research Institute Toronto ON Canada.,Heart and Stroke Foundation Canadian Partnership for Stroke Recovery Toronto ON Canada
| | - Ellen Cohen
- Heart and Stroke Foundation Canadian Partnership for Stroke Recovery Toronto ON Canada.,Department of Physical Therapy University of Toronto Toronto ON Canada
| | - Jessica Colby-Milley
- Hurvitz Brain Sciences ProgramSunnybrook Research Institute Toronto ON Canada.,Heart and Stroke Foundation Canadian Partnership for Stroke Recovery Toronto ON Canada
| | | | | | - Michael Ouk
- Hurvitz Brain Sciences ProgramSunnybrook Research Institute Toronto ON Canada.,Department of Pharmacology & Toxicology University of Toronto Toronto ON Canada
| | - Che-Yuan Wu
- Hurvitz Brain Sciences ProgramSunnybrook Research Institute Toronto ON Canada.,Department of Pharmacology & Toxicology University of Toronto Toronto ON Canada
| | - Baiju R Shah
- Department of Medicine and Institute for Health Policy, Management, and Evaluation University of Toronto Toronto ON Canada.,Divisions of Endocrinology and Obstetric Medicine Department of Medicine Sunnybrook Health Sciences Centre Toronto ON Canada
| | - Krista Lanctôt
- Hurvitz Brain Sciences ProgramSunnybrook Research Institute Toronto ON Canada.,Department of Psychiatry Sunnybrook Health Sciences Centre University of Toronto Toronto ON Canada
| | - Nathan Herrmann
- Hurvitz Brain Sciences ProgramSunnybrook Research Institute Toronto ON Canada.,Department of Psychiatry Sunnybrook Health Sciences Centre University of Toronto Toronto ON Canada
| | - Elizabeth Linkewich
- Department of Occupational Science and Occupational Therapy University of Toronto Toronto ON Canada.,Regional Stroke Centre Sunnybrook Health Sciences Centre Toronto ON Canada
| | - Marcus Law
- Department of Family & Community Medicine University of Toronto Toronto ON Canada.,UHN Toronto Rehabilitation Institute Toronto ON Canada
| | - Sandra E Black
- Hurvitz Brain Sciences ProgramSunnybrook Research Institute Toronto ON Canada.,Department of Medicine (Neurology) Sunnybrook Health Sciences Centre University of Toronto Toronto ON Canada
| | - Richard H Swartz
- ICES Toronto ON Canada.,Department of Medicine (Neurology) Sunnybrook Health Sciences Centre University of Toronto Toronto ON Canada
| | - Moira K Kapral
- ICES Toronto ON Canada.,Department of Medicine and Institute for Health Policy, Management, and Evaluation University of Toronto Toronto ON Canada
| | - Jodi D Edwards
- University of Ottawa Heart InstituteUniversity of Ottawa Ottawa ON Canada.,School of Epidemiology and Public Health University of Ottawa Ottawa ON Canada
| | - Walter Swardfager
- Department of Pharmacology & Toxicology University of Toronto Toronto ON Canada.,KITE UHN Toronto Rehabilitation Institute Toronto ON Canada
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19
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Zhou D, Huang Z, Zhu X, Hong T, Zhao Y. Combination of endothelial progenitor cells and BB-94 significantly alleviates brain damage in a mouse model of diabetic ischemic stroke. Exp Ther Med 2021; 22:789. [PMID: 34055088 PMCID: PMC8145984 DOI: 10.3892/etm.2021.10221] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 04/01/2021] [Indexed: 12/12/2022] Open
Abstract
Ischemic stroke is a complication of chronic macrovascular disease in type 2 diabetes. However, the pathogenesis of diabetic ischemic stroke has not yet been fully clarified. The aim of the present study was to investigate the underlying effects of endothelial progenitor cells (EPCs) and the matrix metalloproteinase inhibitor BB-94 on diabetic stroke. In vitro experiments were performed using oxygen-glucose deprivation/reoxygenation (OGD/R) model cells, established using HT22 mouse hippocampal cells. MTT assays and flow cytometry revealed that BB-94 prominently induced the proliferation of the OGD/R model cells and prevented their apoptosis. When EPCs and BB-94 were applied to the OGD/R model cells in combination, proliferation was further accelerated and oxidative damage was attenuated. In vivo experiments were also performed using a middle cerebral artery occlusion (MCAO) mouse model. The results of modified neurological severity scoring and oxidative stress marker analysis demonstrated that EPCs and BB-94 prominently alleviated cerebral ischemia/reperfusion injury in the MCAO model mice. Furthermore, reverse transcription-quantitative PCR and western blot assays revealed that EPCs in combination with BB-94 significantly downregulated the expression of matrix metalloproteinases (MMPs) and upregulated the expression of tissue inhibitor of metalloproteinases 1 in OGD/R cells and MCAO model mice. The results suggest that EPCs were successfully isolated and identified, and the OGD/R cell and MCAO mouse models were successfully established. They also indicate that EPCs alone or in combination with BB-94 may exert protective effects against ischemic stroke via the reduction of MMP expression.
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Affiliation(s)
- Daixuan Zhou
- Queen Mary College, Nanchang University, Nanchang, Jiangxi 330031, P.R. China
| | - Zhi Huang
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550002, P.R. China
| | - Xiaoxi Zhu
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550002, P.R. China
| | - Tao Hong
- Department of Neurosurgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330029, P.R. China
| | - Yuanli Zhao
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, P.R. China
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20
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Stanciu GD, Rusu RN, Bild V, Filipiuc LE, Tamba BI, Ababei DC. Systemic Actions of SGLT2 Inhibition on Chronic mTOR Activation as a Shared Pathogenic Mechanism between Alzheimer's Disease and Diabetes. Biomedicines 2021; 9:biomedicines9050576. [PMID: 34069618 PMCID: PMC8160780 DOI: 10.3390/biomedicines9050576] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 05/15/2021] [Accepted: 05/17/2021] [Indexed: 02/07/2023] Open
Abstract
Alzheimer's disease (AD) affects tens of millions of people worldwide. Despite the advances in understanding the disease, there is an increased urgency for pharmacological approaches able of impacting its onset and progression. With a multifactorial nature, high incidence and prevalence in later years of life, there is growing evidence highlighting a relationship between metabolic dysfunction related to diabetes and subject's susceptibility to develop AD. The link seems so solid that sometimes AD and type 3 diabetes are used interchangeably. A candidate for a shared pathogenic mechanism linking these conditions is chronically-activated mechanistic target of rapamycin (mTOR). Chronic activation of unrestrained mTOR could be responsible for sustaining metabolic dysfunction that causes the breakdown of the blood-brain barrier, tau hyperphosphorylation and senile plaques formation in AD. It has been suggested that inhibition of sodium glucose cotransporter 2 (SGLT2) mediated by constant glucose loss, may restore mTOR cycle via nutrient-driven, preventing or even decreasing the AD progression. Currently, there is an unmet need for further research insight into molecular mechanisms that drive the onset and AD advancement as well as an increase in efforts to expand the testing of potential therapeutic strategies aimed to counteract disease progression in order to structure effective therapies.
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Affiliation(s)
- Gabriela Dumitrita Stanciu
- Center for Advanced Research and Development in Experimental Medicine (CEMEX), Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700115 Iasi, Romania; (G.D.S.); (V.B.); (L.E.F.)
| | - Razvan Nicolae Rusu
- Pharmacodynamics and Clinical Pharmacy Department, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700115 Iasi, Romania; (R.N.R.); (D.C.A.)
| | - Veronica Bild
- Center for Advanced Research and Development in Experimental Medicine (CEMEX), Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700115 Iasi, Romania; (G.D.S.); (V.B.); (L.E.F.)
- Pharmacodynamics and Clinical Pharmacy Department, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700115 Iasi, Romania; (R.N.R.); (D.C.A.)
| | - Leontina Elena Filipiuc
- Center for Advanced Research and Development in Experimental Medicine (CEMEX), Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700115 Iasi, Romania; (G.D.S.); (V.B.); (L.E.F.)
- Department of Pharmacology, Clinical Pharmacology and Algesiology, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700115 Iasi, Romania
| | - Bogdan-Ionel Tamba
- Center for Advanced Research and Development in Experimental Medicine (CEMEX), Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700115 Iasi, Romania; (G.D.S.); (V.B.); (L.E.F.)
- Department of Pharmacology, Clinical Pharmacology and Algesiology, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700115 Iasi, Romania
- Correspondence:
| | - Daniela Carmen Ababei
- Pharmacodynamics and Clinical Pharmacy Department, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700115 Iasi, Romania; (R.N.R.); (D.C.A.)
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21
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Wu Y, Hu H, Cai J, Chen R, Zuo X, Cheng H, Yan D. Association of hypertension and incident diabetes in Chinese adults: a retrospective cohort study using propensity-score matching. BMC Endocr Disord 2021; 21:87. [PMID: 33926442 PMCID: PMC8082672 DOI: 10.1186/s12902-021-00747-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Accepted: 04/12/2021] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Reliable quantification of the relationship between hypertension and diabetes risk is limited, especially among Chinese people. We aimed to investigate the association between hypertension and the risk of diabetes in a large cohort of the Chinese population. METHODS This was a retrospective propensity score-matched cohort study among 211,809 Chinese adults without diabetes at baseline between 2010 and 2016. The target independent and dependent variable were hypertension at baseline and incident diabetes during follow-up respectively. The propensity score matching using a non-parsimonious multivariable logistic regression was conducted to balance the confounders between 28,711 hypertensive patients and 28,711 non-hypertensive participants. The doubly robust estimation method was used to investigate the association between hypertension and diabetes. RESULTS In the propensity-score matching cohort, diabetes risk increased by 11.0% among hypertensive patients (HR = 1.110, 95% confidence interval (CI): 1.031-1.195, P = 0.00539). And diabetes risk dropped to 8.3% among hypertensive subjects after adjusting for the propensity score (HR = 1.083, 95%CI: 1.006-1.166, P = 0.03367). Compared to non-hypertensive participants with low propensity score, the risk of incident diabetes increased by 2.646 times among hypertensive patients with high propensity score (HR = 3.646, 95%CI: 2.635-5.045, P < 0.0001). CONCLUSION Hypertension was associated with an 11.0% increase in the risk of developing diabetes in Chinese adults. And the figure dropped to 8.3% after adjusting the propensity score. Additionally, compared to non-hypertensive participants with low propensity scores, the risk of incident diabetes increased by 2.646 times among hypertensive patients with high propensity scores.
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Affiliation(s)
- Yang Wu
- Department of Endocrinology, The First Affiliated Hospital of Shenzhen University, No.3002 Sungang Road, Futian District, Shenzhen, 518035, Guangdong Province, China
- Department of Endocrinology, Shenzhen Second People's Hospital, Shenzhen, 518035, Guangdong Province, China
- Shenzhen University Health Science Center, Shenzhen, 518071, Guangdong Province, China
| | - Haofei Hu
- Shenzhen University Health Science Center, Shenzhen, 518071, Guangdong Province, China
- Department of Nephrology, The First Affiliated Hospital of Shenzhen University, Shenzhen, 518035, Guangdong Province, China
- Department of Nephrology, Shenzhen Second People's Hospital, Shenzhen, 518035, Guangdong Province, China
| | - Jinlin Cai
- Department of Endocrinology, The First Affiliated Hospital of Shenzhen University, No.3002 Sungang Road, Futian District, Shenzhen, 518035, Guangdong Province, China
- Department of Endocrinology, Shenzhen Second People's Hospital, Shenzhen, 518035, Guangdong Province, China
- Shantou University Medical College, Shantou, 515000, Guangdong Province, China
| | - Runtian Chen
- Department of Endocrinology, The First Affiliated Hospital of Shenzhen University, No.3002 Sungang Road, Futian District, Shenzhen, 518035, Guangdong Province, China
- Department of Endocrinology, Shenzhen Second People's Hospital, Shenzhen, 518035, Guangdong Province, China
- Shenzhen University Health Science Center, Shenzhen, 518071, Guangdong Province, China
| | - Xin Zuo
- Department of Endocrinology, The Third People's Hospital of Shenzhen, Shenzhen, 518116, Guangdong Province, China
| | - Heng Cheng
- Department of Endocrinology, The Third People's Hospital of Shenzhen, Shenzhen, 518116, Guangdong Province, China
| | - Dewen Yan
- Department of Endocrinology, The First Affiliated Hospital of Shenzhen University, No.3002 Sungang Road, Futian District, Shenzhen, 518035, Guangdong Province, China.
- Department of Endocrinology, Shenzhen Second People's Hospital, Shenzhen, 518035, Guangdong Province, China.
- Shenzhen University Health Science Center, Shenzhen, 518071, Guangdong Province, China.
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22
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Kong L, Liu Y, Zhang YM, Li Y, Gou LS, Ma TF, Liu YW. Sarsasapogenin ameliorates diabetes-associated memory impairment and neuroinflammation through down-regulation of PAR-1 receptor. Phytother Res 2021; 35:3167-3180. [PMID: 33885189 DOI: 10.1002/ptr.7005] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 12/08/2020] [Accepted: 12/15/2020] [Indexed: 12/15/2022]
Abstract
Sarsasapogenin (Sar), a natural steroidal compound, shows neuroprotection, cognition-enhancement, antiinflammation, antithrombosis effects, and so on. However, whether Sar has ameliorative effects on diabetes-associated cognitive impairment remains unknown. In this study, we found that Sar ameliorated diabetes-associated memory impairment in streptozotocin-induced diabetic rats, evidenced by increased numbers of crossing platform and percentage of time spent in the target quadrant in Morris water maze tests, and suppressed the nucleotide-binding domain and leucine-rich repeat containing protein 1 (NLRP1) inflammasome in hippocampus and cerebral cortex. Furthermore, Sar inhibited advanced glycation end-products and its receptor (AGEs/RAGE) axis and suppressed up-regulation of thrombin receptor protease-activated receptor 1 (PAR-1) in cerebral cortex. On the other hand, Sar mitigated high glucose-induced neuronal damages, NLRP1 inflammasome activation, and PAR-1 up-regulation in high glucose-cultured SH-SY5Y cells, but did not affect thrombin activity. Moreover, the effects of Sar were similar to those of a selective PAR-1 antagonist vorapaxar. Further studies indicated that activation of the NLRP1 inflammasome and NF-κB mediated the effect of PAR-1 up-regulation in high glucose condition by using PAR-1 knockdown assay. In summary, this study demonstrated that Sar prevented memory impairment caused by diabetes, which was achieved through suppressing neuroinflammation from activated NLRP1 inflammasome and NF-κB regulated by cerebral PAR-1. HIGHLIGHTS: Sarsasapogenin ameliorated memory impairment caused by diabetes in rats. Sarsasapogenin mitigated neuronal damages and neuroinflammation by down-regulating cerebral PAR-1. The NLRP1 inflammasome and NF-κB signaling mediated the pro-inflammatory effects of PAR-1. Sarsasapogenin was a pleiotropic neuroprotective agent and memory enhancer in diabetic rodents.
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Affiliation(s)
- Li Kong
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Yue Liu
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Yu-Meng Zhang
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Yu Li
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Ling-Shan Gou
- Center for Genetic Medicine, Xuzhou Maternity and Child Health Care Hospital, Xuzhou, Jiangsu, China
| | - Teng-Fei Ma
- Institute for Stem Cell and Neural Regeneration; Key Laboratory of Cardiovascular & Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical University, Nanjing, China
| | - Yao-Wu Liu
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu, China.,Department of Pharmacology, School of Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu, China
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23
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Figeys M, Zeeman M, Kim ES. Effects of Transcranial Direct Current Stimulation (tDCS) on Cognitive Performance and Cerebral Oxygen Hemodynamics: A Systematic Review. Front Hum Neurosci 2021; 15:623315. [PMID: 33897392 PMCID: PMC8058208 DOI: 10.3389/fnhum.2021.623315] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 03/11/2021] [Indexed: 11/24/2022] Open
Abstract
Background: There is increasing evidence to support the efficacy of transcranial direct current stimulation (tDCS) applications in cognitive augmentation and rehabilitation. Neuromodulation achieved with tDCS may further regulate regional cerebral perfusion affiliated through the neurovascular unit; however, components of cerebral perfusion decrease across aging. A novel neuroimaging approach, functional near-infrared spectroscopy (fNIRS), can aid in quantifying these regional perfusional changes. To date, the interaction of the effects of tDCS on cognitive performance across the lifespan and obtained fNIRS hemodynamic responses remain unknown. Objective: This review aims to examine the effects of tDCS on cognitive performance and fNIRS hemodynamic responses within the context of cognitive aging. Methods: Six databases were searched for studies. Quality appraisal and data extraction were conducted by two independent reviewers. Meta-analysis was carried out to determine overall and subgroup effect sizes. Results: Eight studies met inclusion criteria. The overall effect size demonstrates that tDCS can alter cognitive performance and fNIRS signals, with aging being a potential intermediary in tDCS efficacy. Conclusion: From the studies included, the effects of tDCS on cognitive performance and fNIRS metrics are most prominent in young healthy adults and appear to become less robust with increasing age. Given the small number of studies included in this review further investigation is recommended.
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Affiliation(s)
- Mathieu Figeys
- Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, AB, Canada
| | - Michael Zeeman
- Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
| | - Esther Sung Kim
- Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, AB, Canada.,Department of Communication Sciences and Disorders, University of Alberta, Edmonton, AB, Canada
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24
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Governa P, Caroleo MC, Carullo G, Aiello F, Cione E, Manetti F. FFAR1/GPR40: One target, different binding sites, many agonists, no drugs, but a continuous and unprofitable tug-of-war between ligand lipophilicity, activity, and toxicity. Bioorg Med Chem Lett 2021; 41:127969. [PMID: 33771587 DOI: 10.1016/j.bmcl.2021.127969] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 03/09/2021] [Accepted: 03/12/2021] [Indexed: 12/31/2022]
Abstract
The progress made so far in the elucidation of the structure of free fatty acid receptor 1 (FFAR1) and its secondary and ternary complexes with partial and full allosteric ligands led to the discovery of various putative binding regions on the FFAR1 surface. Attempts to develop FFAR1 agonists culminated with the identification of TAK-875 (1), whose phase 3 clinical trials were terminated due to potential liver toxicity. In the search of safer agonists, numerous classes of new compounds were designed, synthesized, and tested. Chemical decoration of the scaffolds was rationalized to reach a good balance between lipophilicity, activity, and toxicity. Today, targeting FFAR1 with positive modulators represents an attractive pharmacological tool for the treatment of type 2 diabetes mellitus (T2DM), mainly because of the lack of hypoglycaemic side effects associated with several antidiabetic drugs currently available. Moreover, considering the involvement of FFAR1 in many physio-pathological processes, its agonists are also emerging as possible therapeutic tools for alleviating organ inflammation and fibrosis, as well as for the treatment of CNS disorders, such as Alzheimer's disease and dementia.
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Affiliation(s)
- Paolo Governa
- Department of Biotechnology, Chemistry and Pharmacy-Department of Excellence 2018-2022, University of Siena, via Aldo Moro 2, I-53100 Siena, Italy
| | - Maria Cristina Caroleo
- Department of Pharmacy, Health and Nutritional Sciences-Department of Excellence 2018-2022, University of Calabria, Ed. Polifunzionale, I-87036 Arcavacata di Rende, CS, Italy
| | - Gabriele Carullo
- Department of Biotechnology, Chemistry and Pharmacy-Department of Excellence 2018-2022, University of Siena, via Aldo Moro 2, I-53100 Siena, Italy
| | - Francesca Aiello
- Department of Pharmacy, Health and Nutritional Sciences-Department of Excellence 2018-2022, University of Calabria, Ed. Polifunzionale, I-87036 Arcavacata di Rende, CS, Italy.
| | - Erika Cione
- Department of Pharmacy, Health and Nutritional Sciences-Department of Excellence 2018-2022, University of Calabria, Ed. Polifunzionale, I-87036 Arcavacata di Rende, CS, Italy.
| | - Fabrizio Manetti
- Department of Biotechnology, Chemistry and Pharmacy-Department of Excellence 2018-2022, University of Siena, via Aldo Moro 2, I-53100 Siena, Italy.
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25
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Yang G, Li C, Wang W, Wang C, Dong A, Wang F, Zhang H. Risk factors for cognitive impairment in patients with first-time ischemic stroke. Am J Transl Res 2021; 13:1884-1889. [PMID: 33841715 PMCID: PMC8014415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 09/24/2020] [Indexed: 06/12/2023]
Abstract
OBJECTIVE To determine the risk factors for cognitive impairment (CI) in patients with first-time ischemic stroke. METHODS The clinical data of 180 patients with ischemic stroke who were admitted to our hospital from January 2018 to December 2019 was retrospectively analyzed. Patients with MMSE score ≤24 were included into the CI group and the rest of the patients were placed into the normal group. Multivariate logistic regression was applied to describe risk factors for CI in patients with first-time ischemic stroke. RESULTS Among the patients with first-time ischemic stroke, 96 cases (53%) developed CI, 84 cases (47%) were normal. In different subtypes of TOAST classifications, patients with large-artery atherosclerosis had the highest CI incidence (66.96%). For different infarction sites, the highest CI incidence occurred in the frontal lobe (82.35%), and the lowest was from cerebellar infarction (37.50%). The difference of CI incidences in the frontal lobe, parietal lobe, temporal lobe and occipital lobe was significant between the two groups (P<0.05). Logistic regression analysis indicated that independent risk factors for CI in patients with first ischemic stroke include age ≥60 years old, diabetes history, CRP >6.53 mg/L, Hcy >13.84 μmol/L, NIHSS score >4.37, VD <45.16 nmol/L, and the difference was statistically significant (P<0.05). CONCLUSION The study showed a high CI incidence in patients with preexisting ischemic stroke. Age ≥60 years old, history of diabetes mellitus, CRP >6.53 mg/L, Hcy >13.84 μmol/L, NIHSS score >4.37 score, VD <45.16 nmol/L are independent risk factors for CI in patients with first-time ischemic stroke.
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Affiliation(s)
- Guotao Yang
- Department of The Third Neurology, Cangzhou Central Hospital Cangzhou 061000, Hebei, China
| | - Conghui Li
- Department of The Third Neurology, Cangzhou Central Hospital Cangzhou 061000, Hebei, China
| | - Wenhui Wang
- Department of The Third Neurology, Cangzhou Central Hospital Cangzhou 061000, Hebei, China
| | - Chunyu Wang
- Department of The Third Neurology, Cangzhou Central Hospital Cangzhou 061000, Hebei, China
| | - Aiqin Dong
- Department of The Third Neurology, Cangzhou Central Hospital Cangzhou 061000, Hebei, China
| | - Fang Wang
- Department of The Third Neurology, Cangzhou Central Hospital Cangzhou 061000, Hebei, China
| | - Hailiu Zhang
- Department of The Third Neurology, Cangzhou Central Hospital Cangzhou 061000, Hebei, China
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Chavda V, Shah P, Patel SS, Bhadada S. Pre-exposure of voglibose exerts cerebroprotective effects through attenuating activation of the polyol pathway and inflammation. Eur J Neurosci 2021; 53:2541-2552. [PMID: 33608957 DOI: 10.1111/ejn.15151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 02/12/2021] [Accepted: 02/14/2021] [Indexed: 11/29/2022]
Abstract
Chronic hyperglycemia induces activation of the polyol-sorbitol pathway, which is a major contributor to microvascular complications like stroke. The current study was designed to elucidate the therapeutic role of α-glucose inhibitor in chronic hyperglycemia-induced impaired polyol pathway and associated micro-complications. Male albino-Wistar rats (200-250 g) were treated with voglibose 10 mg kg-1 day-1 /p.o. for 2 weeks before middle cerebral artery occlusion; 72 hr after surgery, neurological score was evaluated and blood was collected for the assessment of various serum biochemical parameters like CRP, CK-MB, LDH, lipid profile, and blood glucose levels. In the end, brain samples were excised for determination of brain infarct volume, brain hemisphere weight difference, Na+-K+ ATPase activity oxidative stress-related parameters, aldose reductase activity, and gene expression studies. Results from the present study indicate that pre-treatment with voglibose showed significant improvement in lipid parameters but did not impact glucose levels. Voglibose has shown a statistically significant (p < .05) reduction in neurological score and brain infarct volume, and the difference in brain hemisphere weight as compared to the disease control group. Voglibose significantly (p < .05) improve all biochemical parameters and reduced Na+-K+ ATPase and aldose reductase activity. Moreover, voglibose produced a significant reduction in oxidative stress and down-regulation of TNF-α and BCl-2 gene expression which reduces the risk of factors related to stroke. In conclusion, the pleiotropic effect of voglibose on cerebrovascular complications may be due to inhibition of aldose reductase or anti-inflammatory pathways.
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Affiliation(s)
- Vishal Chavda
- Department of Pharmacology, Institute of Pharmacy, Nirma University, Ahmadabad, Gujarat, India
| | - Pooja Shah
- Department of Pharmacology, Institute of Pharmacy, Nirma University, Ahmadabad, Gujarat, India
| | - Snehal S Patel
- Department of Pharmacology, Institute of Pharmacy, Nirma University, Ahmadabad, Gujarat, India
| | - Shraddha Bhadada
- Department of Pharmacology, Institute of Pharmacy, Nirma University, Ahmadabad, Gujarat, India
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27
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Wu Y, Hu H, Cai J, Chen R, Zuo X, Cheng H, Yan D. Machine Learning for Predicting the 3-Year Risk of Incident Diabetes in Chinese Adults. Front Public Health 2021; 9:626331. [PMID: 34268283 PMCID: PMC8275929 DOI: 10.3389/fpubh.2021.626331] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 05/21/2021] [Indexed: 02/05/2023] Open
Abstract
Purpose: We aimed to establish and validate a risk assessment system that combines demographic and clinical variables to predict the 3-year risk of incident diabetes in Chinese adults. Methods: A 3-year cohort study was performed on 15,928 Chinese adults without diabetes at baseline. All participants were randomly divided into a training set (n = 7,940) and a validation set (n = 7,988). XGBoost method is an effective machine learning technique used to select the most important variables from candidate variables. And we further established a stepwise model based on the predictors chosen by the XGBoost model. The area under the receiver operating characteristic curve (AUC), decision curve and calibration analysis were used to assess discrimination, clinical use and calibration of the model, respectively. The external validation was performed on a cohort of 11,113 Japanese participants. Result: In the training and validation sets, 148 and 145 incident diabetes cases occurred. XGBoost methods selected the 10 most important variables from 15 candidate variables. Fasting plasma glucose (FPG), body mass index (BMI) and age were the top 3 important variables. And we further established a stepwise model and a prediction nomogram. The AUCs of the stepwise model were 0.933 and 0.910 in the training and validation sets, respectively. The Hosmer-Lemeshow test showed a perfect fit between the predicted diabetes risk and the observed diabetes risk (p = 0.068 for the training set, p = 0.165 for the validation set). Decision curve analysis presented the clinical use of the stepwise model and there was a wide range of alternative threshold probability spectrum. And there were almost no the interactions between these predictors (most P-values for interaction >0.05). Furthermore, the AUC for the external validation set was 0.830, and the Hosmer-Lemeshow test for the external validation set showed no statistically significant difference between the predicted diabetes risk and observed diabetes risk (P = 0.824). Conclusion: We established and validated a risk assessment system for characterizing the 3-year risk of incident diabetes.
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Affiliation(s)
- Yang Wu
- Department of Endocrinology, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
- Department of Endocrinology, Shenzhen Second People's Hospital, Shenzhen, China
- Shenzhen University Health Science Center, Shenzhen, China
| | - Haofei Hu
- Shenzhen University Health Science Center, Shenzhen, China
- Department of Nephrology, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
- Department of Nephrology, Shenzhen Second People's Hospital, Shenzhen, China
| | - Jinlin Cai
- Department of Endocrinology, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
- Department of Endocrinology, Shenzhen Second People's Hospital, Shenzhen, China
- Shantou University Medical College, Shantou, China
| | - Runtian Chen
- Department of Endocrinology, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
- Department of Endocrinology, Shenzhen Second People's Hospital, Shenzhen, China
- Shenzhen University Health Science Center, Shenzhen, China
| | - Xin Zuo
- Department of Endocrinology, The Third People's Hospital of Shenzhen, Shenzhen, China
| | - Heng Cheng
- Department of Endocrinology, The Third People's Hospital of Shenzhen, Shenzhen, China
| | - Dewen Yan
- Department of Endocrinology, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
- Department of Endocrinology, Shenzhen Second People's Hospital, Shenzhen, China
- Shenzhen University Health Science Center, Shenzhen, China
- *Correspondence: Dewen Yan
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28
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Chaytor NS, Barbosa-Leiker C, Germine LT, Fonseca LM, McPherson SM, Tuttle KR. Construct validity, ecological validity and acceptance of self-administered online neuropsychological assessment in adults. Clin Neuropsychol 2021; 35:148-164. [PMID: 32883156 PMCID: PMC8982107 DOI: 10.1080/13854046.2020.1811893] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 08/12/2020] [Accepted: 08/13/2020] [Indexed: 12/29/2022]
Abstract
Objective: The goal of this project was to explore the initial psychometric properties (construct and ecological validity) of self-administered online (SAO) neuropsychological assessment (using the www.testmybrain.org platform), compared to traditional testing, in a clinical sample, as well as to evaluate participant acceptance. SAO assessment has the potential to expand the reach of in-person neuropsychological assessment approaches.Method: Counterbalanced, within-subjects design comparing SAO performance to in-person performance in adults with diabetes with and without Chronic Kidney Disease (CKD). Forty-nine participants completed both assessment modalities (type 1 diabetes N = 14, type 2 diabetes N = 35; CKD N = 18).Results: Associations between SAO and analogous in-person tests were adequate to good (r = 0.49-0.66). Association strength between divergent cognitive tests did not differ between SAO versus in-person tests. SAO testing was more strongly associated with age than in-person testing (age R2=0.54 versus 0.23), while prediction of education, HbA1c, and estimated glomerular filtration rate (eGFR) did not differ significantly between test modalities (education R2=0.37 versus 0.30; HbA1c R2=0.20 versus 0.12; eGFR R2 = 0.41 versus 0.33). Associations with measures of everyday functioning were also similar (Functional Activities Questionnaire R2=0.08 versus 0.07; Neuro-QoL R2=0.14 versus 0.16; Diabetes Self-Management Questionnaire R2=0.19 versus 0.19).Conclusions: The selected SAO neuropsychological tests had acceptable construct validity (including divergent, convergent, and criterion-related validity), and similar ecological validity to that of traditional testing. These SAO assessments were acceptable to participants and appear appropriate for use in research applications, although further research is needed to better understand the strengths and weaknesses in other clinical populations.
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Affiliation(s)
- Naomi S Chaytor
- WSU Health Sciences Spokane, Elson S. Floyd College of Medicine, Washington State University, Spokane, WA, USA
| | | | - Laura T Germine
- Institute for Technology in Psychiatry, McLean Hospital, Belmont, MA, USA
- Psychiatry Department, Harvard Medical School, Boston, MA, USA
| | - Luciana Mascarenhas Fonseca
- WSU Health Sciences Spokane, Elson S. Floyd College of Medicine, Washington State University, Spokane, WA, USA
| | - Sterling M McPherson
- WSU Health Sciences Spokane, Elson S. Floyd College of Medicine, Washington State University, Spokane, WA, USA
- School of Medicine, University of Washington, Seattle, WA, USA
- Providence Health Care, Spokane, WA, USA
| | - Katherine R Tuttle
- School of Medicine, University of Washington, Seattle, WA, USA
- Providence Health Care, Spokane, WA, USA
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29
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Liu Y, Zhang H, Wang S, Guo Y, Fang X, Zheng B, Gao W, Yu H, Chen Z, Roman RJ, Fan F. Reduced pericyte and tight junction coverage in old diabetic rats are associated with hyperglycemia-induced cerebrovascular pericyte dysfunction. Am J Physiol Heart Circ Physiol 2020; 320:H549-H562. [PMID: 33306445 DOI: 10.1152/ajpheart.00726.2020] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Diabetes mellitus (DM) is one of the primary pathological factors that contributes to aging-related cognitive impairments, but the underlying mechanisms remain unclear. We recently reported that old DM rats exhibited impaired myogenic responses of the cerebral arteries and arterioles, poor cerebral blood flow autoregulation, enhanced blood-brain barrier (BBB) leakage, and cognitive impairments. These changes were associated with diminished vascular smooth muscle cell contractile capability linked to elevated reactive oxygen species (ROS) and reduced ATP production. In the present study, using a nonobese T2DN DM rat, we isolated parenchymal arterioles (PAs), cultured cerebral microvascular pericytes, and examined whether cerebrovascular pericyte in DM is damaged and whether pericyte dysfunction may play a role in the regulation of cerebral hemodynamics and BBB integrity. We found that ROS and mitochondrial superoxide production were elevated in PAs isolated from old DM rats and in high glucose (HG)-treated α-smooth muscle actin-positive pericytes. HG-treated pericytes displayed decreased contractile capability in association with diminished mitochondrial respiration and ATP production. Additionally, the expression of advanced glycation end products, transforming growth factor-β, vascular endothelial growth factor, and fibronectin were enhanced, but claudin 5 and integrin β1 was reduced in the brain of old DM rats and HG-treated pericytes. Further, endothelial tight junction and pericyte coverage on microvessels were reduced in the cortex of old DM rats. These results demonstrate our previous findings that the impaired cerebral hemodynamics and BBB leakage and cognitive impairments in the same old DM model are associated with hyperglycemia-induced cerebrovascular pericyte dysfunction.NEW & NOTEWORTHY This study demonstrates that the loss of contractile capability in pericytes in diabetes is associated with enhanced ROS and reduced ATP production. Enhanced advanced glycation end products (AGEs) in diabetes accompany with reduced pericyte and endothelial tight junction coverage in the cortical capillaries of old diabetic rats. These results suggest our previous findings that the impaired cerebral hemodynamics, BBB leakage, and cognitive impairments in old DM model are associated with hyperglycemia-induced cerebrovascular pericyte dysfunction.
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Affiliation(s)
- Yedan Liu
- Department of Pediatrics, Affiliated Hospital of Qingdao University, Qingdao, Shandong, China.,Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Huawei Zhang
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Shaoxun Wang
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Ya Guo
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Xing Fang
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Baoying Zheng
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Wenjun Gao
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Hongwei Yu
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Zongbo Chen
- Department of Pediatrics, Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
| | - Richard J Roman
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
| | - Fan Fan
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi
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Yang MY, Fan Z, Zhang Z, Fan J. MitoQ protects against high glucose-induced brain microvascular endothelial cells injury via the Nrf2/HO-1 pathway. J Pharmacol Sci 2020; 145:105-114. [PMID: 33357768 DOI: 10.1016/j.jphs.2020.10.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 10/07/2020] [Accepted: 10/23/2020] [Indexed: 12/13/2022] Open
Abstract
Brain microvascular endothelial cells (BMECs) dysfunction is related to the pathogenesis of neurovascular complication of diabetes mellitus that adversely lead to various CNS disorders. Mitoquinone (MitoQ) is a mitochondria targeted antioxidant that exerts multiple protective effects in many oxidative damage-related diseases. In this study, we determined the protective effects of MitoQ on high glucose (HG)-induced BMECs injury and investigated the underlying mechanism. We found that HG significantly reduced the expression of Nrf2 and HO-1, decreased mitochondrial membrane potential, increased intracellular and mitochondrial reactive oxygen species (ROS) generation, induced cytoskeletal damage and apoptosis in BMECs. In addition, Mito tempol, a mitochondrial ROS scavenger, significantly reduced HG-induced mitochondrial ROS production and attenuated cytoskeletal damage and cell apoptosis, suggesting MtROS production was involved in HG-induced BMECs injury. Moreover, we found that MitoQ treatment significantly upregulated the expression of Nrf2 and HO-1 in HG-induced BMECs, which is accompanied by improved mitochondrial membrane potential and decreased MtROS production. Meanwhile, MitoQ treatment also remarkably attenuated HG-induced cytoskeletal damage and cell apoptosis in BMECs. However, inhibitor of Nrf2 with ML385 impaired the protective effects of MitoQ in HG-induced BMECs. In conclusion, our results suggest that MitoQ exerts protective effect on HG-induced BMECs injury via activating Nrf2/HO-1 pathway.
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Affiliation(s)
- Min-Yan Yang
- Department of Internal Medicine, The Fourth People's Hospital of Chengdu, Chengdu, Sichuan, China
| | - Zhen Fan
- Department of Geriatrics, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan, China
| | - Zhao Zhang
- Department of Emergency, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan, China
| | - Jin Fan
- Department of Neurology, The General Hospital of Western Theater Command, Chendu, Sichuan, China.
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Yin Q, Ma J, Han X, Zhang H, Wang F, Zhuang P, Zhang Y. Spatiotemporal variations of vascular endothelial growth factor in the brain of diabetic cognitive impairment. Pharmacol Res 2020; 163:105234. [PMID: 33053446 DOI: 10.1016/j.phrs.2020.105234] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 09/25/2020] [Accepted: 10/04/2020] [Indexed: 12/14/2022]
Abstract
Although it is feared that diabetes-induced cognitive impairment (DCI) will become a major clinical problem worldwide in the future, its detailed pathological mechanism is not well known. Because patients with diabetes have various complications of vascular disease, vascular disorders in the brain are considered to be one of the main mechanisms of DCI. Mounting evidence suggests that the vascular endothelial growth factor (VEGF) family plays a crucial role in the development of DCI. In this review, we summarized the changes and functions of VEGF during the development of DCI, and speculated that it was characterized by spatiotemporal variations in DCI progression. Considering the complexity of DCI pathogenesis and the diversity of VEGF function, we focused on the interrelationship of DCI and VEGF spatiotemporal variations during DCI development. During the progression of DCI, hyperglycemia, abnormal brain insulin signals, advanced glycation end products (AGEs) and consequently hypoxia, oxidative stress, and inflammation are the main pathophysiological changes; hypoxia-inducible factor (HIF), reactive oxygen species (ROS), and nuclear factor kappa beta (NF-κB) play major roles in DCI-related VEGF spatiotemporal regulation. Furthermore, spatiotemporal variations in VEGF-mediated pathological cerebral neovascularization, repair and regeneration of dural lymphatic vessels, increased blood-brain barrier (BBB) permeability and slight neuroprotection are increasing emphasized as potential targets in the treatment of DCI.
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Affiliation(s)
- Qingsheng Yin
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China.
| | - Jing Ma
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China.
| | - Xu Han
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China.
| | - Hanyu Zhang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China.
| | - Fang Wang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China.
| | - Pengwei Zhuang
- Chinese Materia Medica College, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China; State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China.
| | - Yanjun Zhang
- State Key Laboratory of Component-based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China.
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Thapak P, Bishnoi M, Sharma SS. Pharmacological Inhibition of Transient Receptor Potential Melastatin 2 (TRPM2) Channels Attenuates Diabetes-induced Cognitive Deficits in Rats: A Mechanistic Study. Curr Neurovasc Res 2020; 17:249-258. [DOI: 10.2174/1567202617666200415142211] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 03/02/2020] [Accepted: 03/07/2020] [Indexed: 02/08/2023]
Abstract
Background:
Diabetes is a chronic metabolic disorder affecting the central nervous system.
A growing body of evidence has depicted that high glucose level leads to the activation of the
transient receptor potential melastatin 2 (TRPM2) channels. However, there are no studies targeting
TRPM2 channels in diabetes-induced cognitive decline using a pharmacological approach.
Objective:
The present study intended to investigate the effects of 2-aminoethoxydiphenyl borate
(2-APB), a TRPM2 inhibitor, in diabetes-induced cognitive impairment.
Methods:
Streptozotocin (STZ, 50 mg/kg, i.p.) was used to induce diabetes in rats. Animals were
randomly divided into the treatment group, model group and age-matched control and pre se
group. 2-APB treatment was given for three weeks to the animals. After 10 days of behavioural
treatment, parameters were performed. Animals were sacrificed at 10th week of diabetic induction
and the hippocampus and cortex were isolated. After that, protein and mRNA expression study
was performed in the hippocampus. Acetylcholinesterase (AchE) activity was done in the cortex.
Results: :
Our study showed the 10th week diabetic animals developed cognitive impairment, which
was evident from the behavioural parameters. Diabetic animals depicted an increase in the TRPM2
mRNA and protein expression in the hippocampus as well as increased AchE activity in the cortex.
However, memory associated proteins were down-regulated, namely Ca2+/calmodulin-dependent
protein kinase II (CaMKII-Thr286), glycogen synthase kinase 3 beta (GSK-3β-Ser9), cAMP
response element-binding protein (CREB-Ser133), and postsynaptic density protein 95 (PSD-95).
Gene expression of parvalbumin, calsequestrin and brain-derived neurotrophic factor (BDNF)
were down-regulated while mRNA level of calcineurin A/ protein phosphatase 3 catalytic subunit
alpha (PPP3CA) was upregulated in the hippocampus of diabetic animals. A three-week treatment
with 2-APB significantly ameliorated the alteration in behavioural cognitive parameters in diabetic
rats. Moreover, 2-APB also down-regulated the expression of TRPM2 mRNA and protein in the
hippocampus as well as AchE activity in the cortex of diabetic animals as compared to diabetic
animals. Moreover, the 2-APB treatment also upregulated the CaMKII (Thr-286), GSK-3β (Ser9),
CREB (Ser133), and PSD-95 expression and mRNA levels of parvalbumin, calsequestrin, and
BDNF while mRNA level of calcineurin A was down-regulated in the hippocampus of diabetic
animals.
Conclusion: :
This study confirms the ameliorative effect of TRPM2 channel inhibitor in the diabetes-
induced cognitive deficits. Inhibition of TRPM2 channels reduced the calcium associated
downstream signaling and showed a neuroprotective effect of TRPM2 channels in diabetesinduced
cognitive impairment.
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Affiliation(s)
- Pavan Thapak
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab, India
| | - Mahendra Bishnoi
- National Agri-Food Biotechnology Institute, Sector 81, S.A.S. Nagar, Punjab, India
| | - Shyam S. Sharma
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S. Nagar, Punjab, India
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Thapak P, Bishnoi M, Sharma SS. Amelioration of diabetes-induced cognitive impairment by Transient Receptor Potential Vanilloid 2 (TRPV2) channel inhibitor: Behavioral and mechanistic study. Neurochem Int 2020; 139:104783. [PMID: 32652268 DOI: 10.1016/j.neuint.2020.104783] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 05/29/2020] [Accepted: 06/05/2020] [Indexed: 02/08/2023]
Abstract
Transient receptor potential (TRP) channels are Ca2+ permeable non-selective cation channels which play a pivotal role in diabetes and diabetic complications. Among diabetic complications, diabetes-induced cognitive impairment is a major CNS complication. The role of several TRP channels has been investigated extensively for their diverse Ca2+ regulating mechanism, and recently their role has been postulated in the progression of neurodegenerative disorders. However, the role of TRPV2 has not been investigated yet. Therefore, in the present study, the involvement of TRPV2 channels was investigated in diabetes-induced cognitive impairment using TRPV2 inhibitor, tranilast. High glucose exposure in rat C6 glial cells enhances the Ca2+-entry through TRPV2 channels. In our in-vivo study, diabetic rats showed increased gene and protein expression of TRPV2 in the hippocampus. Subsequent increase in the acetylcholinesterase activity in the cortex, as well as decrease in the phosphorylation of Ca2+/calmodulin-dependent protein kinase II (p-CaMKII-Thr-286), p-GSK-3β (Ser-9), p-CREB (Ser-133) and postsynaptic density protein 95 (PSD-95) in the hippocampus were also observed this led to the impairment in the learning and memory as evident from behavioral parameters such as Morris water maze test, passive avoidance and Y-maze test paradigm. Three-week treatment with tranilast (30 and 100 mg/kg, p.o.) showed improvement in learning and memory associated behaviours (Morris water maze test, passive avoidance, and Y-maze test) by increasing the p-CaMKII (Thr-286), p-GSK-3β (Ser-9), p-CREB (Ser-133) and PSD-95 in the hippocampus. Cortical acetylcholinesterase activity was also reduced by the tranilast. These findings depicted that TRPV2 inhibition may be an effective treatment strategy in diabetes-induced cognitive deficits.
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Affiliation(s)
- P Thapak
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), S. A. S. Nagar, Punjab, India
| | - M Bishnoi
- National Agri-Food Biotechnology Institute (NABI), S. A. S. Nagar, Punjab, India
| | - S S Sharma
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), S. A. S. Nagar, Punjab, India.
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Ortiz K, Garcia MA, Briceño E, Diminich ED, Arévalo SP, Vega IE, Tarraf W. Glycosylated hemoglobin level, race/ethnicity, and cognition in midlife and early old age. RESEARCH IN HUMAN DEVELOPMENT 2020; 17:20-40. [PMID: 34093090 PMCID: PMC8174791 DOI: 10.1080/15427609.2020.1743810] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Empirical evidence linking racial/ethnic differences in glycosylated hemoglobin levels (HbA1c) to cognitive function in midlife and early old age is limited. We use biomarker data from the Health and Retirement Study (HRS, 2006-2014), on adults 50-64 years at baseline (57-73 years by 2014), and fit multinomial logistic regression models to assess the association between baseline HbA1c, cognitive function (using Langa-Weir classifications) and mortality across 8-years. Additionally, we test for modification effects by race/ethnicity. In age- and sex-adjusted models high HbA1c level was associated with lower baseline cognition and higher relative risk ratios (RRR; vs. normal cognition) for cognitive impairment no dementia (CIND; RRR= 2.3; 95%CI=[1.38;3.84]; p<0.01), and dementia (RRR= 4.00; 95%CI=[1.76;9.10]; p<0.01). Adjusting for sociodemographic, behavioral risk factors, and other health conditions explained the higher RRR for CIND and attenuated the RRR for dementia by approximately 30%. HbA1c levels were not linked to the slope of cognitive decline, and we found no evidence of modification effects for HbA1c by race/ethnicity. Targeting interventions for glycemic control in the critical midlife period can protect baseline cognition and buffer against downstream development of cognitive impairment. This can yield important public health benefits and reductions in burdens associated with cognitive impairment, particularly among race/ethnic minorities who are at higher risk for metabolic diseases.
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Affiliation(s)
- Kasim Ortiz
- University of New Mexico, Department of Sociology & Criminology, Institute for the Study of “Race” & Social Justice, Center for Participatory Research
| | - Marc A. Garcia
- University of Nebraska, Lincoln, Department of Sociology & Institute of Ethnic Studies
| | - Emily Briceño
- University of Michigan, School of Medicine, Department of Physical Medicine & Rehabilitation
| | - Erica D. Diminich
- Stony Brook University, Renaissance School of Medicine, Program in Public Health, Department of Family, Population and Preventive Medicine
| | - Sandra P. Arévalo
- California State University, Long Beach, Department of Human Development
| | - Irving E. Vega
- Michigan State University, College of Human Medicine, Department of Translational Neuroscience
| | - Wassim Tarraf
- Wayne State University, Institute of Gerontology & Department of Healthcare Sciences
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Song J, Cui S, Chen Y, Ye X, Huang X, Su H, Zhou Y, Liu X, Chen W, Shan X, Yan Z, Liu K. Disrupted Regional Cerebral Blood Flow in Children With Newly-Diagnosed Type 1 Diabetes Mellitus: An Arterial Spin Labeling Perfusion Magnetic Resonance Imaging Study. Front Neurol 2020; 11:572. [PMID: 32636800 PMCID: PMC7316953 DOI: 10.3389/fneur.2020.00572] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 05/19/2020] [Indexed: 01/08/2023] Open
Abstract
Object: Diabetes is associated with cerebral vascular dysfunction and increased vascular cognitive impairment. The objective of this study was to use arterial spin labeling (ASL) perfusion-weighted magnetic resonance imaging to investigate whether cerebral perfusion was changed in newly-diagnosed children with type 1 diabetes mellitus (T1DM) and the possible relationship between aberrant cerebral blood flow (CBF) with cognitive as well as clinical variables. Methods: Between January 2017 and February 2018, 34 children with newly-diagnosed T1DM and 34 age, gender, and education-matched healthy controls were included. Three dimensional pseudo-continuous ASL perfusion MRI was used to evaluate CBF. A conventional T2WI sequence was added to exclude intracranial disease. Regions with CBF differences between T1DM children and the controls were detected via voxel-wise comparisons in REST software. Associations among the result of neuropsychological test, clinical variables, and CBF values of different brains were investigated by using partial correlation analysis. Results: Compared with the controls, T1DM children show decreased CBF in the left calcarine and postcentral gyrus, and right precentral gyrus. The perfusion in the postcentral gyrus was positively correlated with IQ performance. No significant correlations were found between CBF and HbA1c, blood glucose level before imaging and IQ in other brain regions in T1DM children. Conclusion: There is an abnormal cerebral perfusion in children with newly diagnosed T1DM. The visual and sensorimotor areas are brain areas where perfusion is prone to change at the beginning of T1DM. Our study provided clues for cerebral pathophysiological changes in the initial stage of T1DM.
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Affiliation(s)
- Jiawen Song
- Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Shihan Cui
- Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Yaomeng Chen
- Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xinjian Ye
- Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xiaoyan Huang
- Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Haiyan Su
- Department of Pediatric Endocrine, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Yongjin Zhou
- Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xiaozheng Liu
- Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Wei Chen
- Department of Psychiatry, Sir Run Run Shaw Hospital, Collaborative Innovation Center for Brain Science, Zhejiang University School of Medicine, Hangzhou, China
| | - Xiaoou Shan
- Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Zhihan Yan
- Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Kun Liu
- Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
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Type 3 Diabetes and Its Role Implications in Alzheimer's Disease. Int J Mol Sci 2020; 21:ijms21093165. [PMID: 32365816 PMCID: PMC7246646 DOI: 10.3390/ijms21093165] [Citation(s) in RCA: 137] [Impact Index Per Article: 34.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Revised: 04/21/2020] [Accepted: 04/28/2020] [Indexed: 12/13/2022] Open
Abstract
The exact connection between Alzheimer’s disease (AD) and type 2 diabetes is still in debate. However, poorly controlled blood sugar may increase the risk of developing Alzheimer’s. This relationship is so strong that some have called Alzheimer’s “diabetes of the brain” or “type 3 diabetes (T3D)”. Given more recent studies continue to indicate evidence linking T3D with AD, this review aims to demonstrate the relationship between T3D and AD based on the fact that both the processing of amyloid-β (Aβ) precursor protein toxicity and the clearance of Aβ are attributed to impaired insulin signaling, and that insulin resistance mediates the dysregulation of bioenergetics and progress to AD. Furthermore, insulin-related therapeutic strategies are suggested to succeed in the development of therapies for AD by slowing down their progressive nature or even halting their future complications.
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Cui Y, Tang TY, Lu CQ, Cai Y, Lu T, Wang YC, Teng GJ, Ju S. Abnormal Cingulum Bundle Induced by Type 2 Diabetes Mellitus: A Diffusion Tensor Tractography Study. Front Aging Neurosci 2020; 12:594198. [PMID: 33384593 PMCID: PMC7771529 DOI: 10.3389/fnagi.2020.594198] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 11/16/2020] [Indexed: 01/29/2023] Open
Abstract
Purpose: In Type 2 diabetes (T2DM), white matter (WM) pathology has been suggested to play an important role in the etiology of T2DM-related cognitive impairment. This study aims to investigate the integrity of the cingulum bundle (CB), a major WM tract, in T2DM patients using diffusion tensor tractography. Methods: Thirty-seven T2DM patients and 34 age-, sex- and education matched healthy controls were included and underwent diffusion tensor imaging. Tractography of bilateral CB tracts was performed and diffusion measurements were compared between the two groups. Next, brain regions with significant group differences on fractional anisotropy (FA) values were set as the region of interest (ROI), and the CB fibers that passed through were identified. Diffusion measures were extracted from these fibers to investigate their correlations with the cognitive performances and endocrine parameters. Results: T2DM patients exhibited decreased FA in bilateral CB, increased mean diffusion (MD) in the right CB, and decreased length in the left CB. Through voxel-wise comparison, the most prominent FA difference was identified in the posterior segment of the CB and the reconstructed tract was part of the retrosplenial component. Importantly, the diffusion measurements of the tract were significantly correlated with the impaired performance in executive functioning and elevated insulin resistance (IR) in the T2DM group, instead of the control group. Conclusions: The diffusion measurements in bilateral CB were altered in T2DM patients, which might reflect important neuropathologic changes in the fibers. Our study adds to knowledge about how the cingulum changes structurally along its entire length in T2DM and highlights the relationship between WM and cognitive performance. Besides, IR might be an important risk factor that warrants further exploration.
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Affiliation(s)
- Ying Cui
- Department of Radiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Tian-Yu Tang
- Jiangsu Key Laboratory of Molecular and Functional Imaging, Department of Radiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Chun-Qiang Lu
- Department of Radiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Yu Cai
- Department of Radiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Tong Lu
- Department of Radiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Yuan-Cheng Wang
- Department of Radiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Gao-Jun Teng
- Department of Radiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Shenghong Ju
- Department of Radiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
- *Correspondence: Shenghong Ju
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Jackson L, Dong G, Althomali W, Sayed MA, Eldahshan W, Baban B, Johnson MH, Filosa J, Fagan SC, Ergul A. Delayed Administration of Angiotensin II Type 2 Receptor (AT2R) Agonist Compound 21 Prevents the Development of Post-stroke Cognitive Impairment in Diabetes Through the Modulation of Microglia Polarization. Transl Stroke Res 2019; 11:762-775. [PMID: 31792796 DOI: 10.1007/s12975-019-00752-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Revised: 10/11/2019] [Accepted: 10/30/2019] [Indexed: 12/18/2022]
Abstract
A disabling consequence of stroke is cognitive impairment, occurring in 12%-48% of patients, for which there is no therapy. A critical barrier is the lack of understanding of how post-stroke cognitive impairment (PSCI) develops. While 70% of stroke victims present with comorbid diseases such as diabetes and hypertension, the limited use of comorbid disease models in preclinical research further contributes to this lack of progress. To this end, we used a translational model of diabetes to study the development of PSCI. In addition, we evaluated the application of compound 21 (C21), an angiotensin II Type 2 receptor agonist, for the treatment of PSCI by blinding the treatment assignment, setting strict inclusion criteria, and implementing a delayed administration time point. Diabetes was induced by a high-fat diet (HFD) and low-dose streptozotocin (STZ) combination. Control and diabetic rats were subjected to 1 h middle cerebral artery occlusion (MCAO) or sham surgery. Adhesive removal task (ART) and two-trial Y-maze were utilized to test sensorimotor and cognitive function. Three days post-stroke, rats that met the inclusion criteria were administered C21 or vehicle in drinking water at a dose of 0.12 mg/kg/day for 8 weeks. Samples from freshly harvested brains were analyzed by flow cytometry and immunohistochemistry (IHC). Diabetes exacerbated the development of PSCI and increased inflammation and demyelination. Delayed administration of C21 3 days post-stroke reduced mortality and improved sensorimotor and cognitive deficits. It also reduced inflammation and demyelination through modulation of the M1:M2 ratio in the diabetic animals.
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Affiliation(s)
- Ladonya Jackson
- Program in Clinical and Experimental Therapeutics, University of Georgia College of Pharmacy, Augusta, GA, USA.,Charlie Norwood Veterans Affairs Medical Center, Augusta, USA.,Physiology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Guangkuo Dong
- Physiology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Waleed Althomali
- Program in Clinical and Experimental Therapeutics, University of Georgia College of Pharmacy, Augusta, GA, USA.,Charlie Norwood Veterans Affairs Medical Center, Augusta, USA
| | - Mohammed A Sayed
- Program in Clinical and Experimental Therapeutics, University of Georgia College of Pharmacy, Augusta, GA, USA.,Charlie Norwood Veterans Affairs Medical Center, Augusta, USA
| | - Wael Eldahshan
- Program in Clinical and Experimental Therapeutics, University of Georgia College of Pharmacy, Augusta, GA, USA.,Charlie Norwood Veterans Affairs Medical Center, Augusta, USA.,Physiology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Babak Baban
- Oral Biology, Dental College of Georgia, Augusta, GA, USA
| | - Maribeth H Johnson
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Jessica Filosa
- Physiology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Susan C Fagan
- Program in Clinical and Experimental Therapeutics, University of Georgia College of Pharmacy, Augusta, GA, USA.,Charlie Norwood Veterans Affairs Medical Center, Augusta, USA
| | - Adviye Ergul
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, 171 Ashley Ave. MSC, Charleston, SC, 908, USA. .,Ralph H. Johnson Veterans Affairs Medical Center, Charleston, SC, USA.
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Liu W, Zhou Y, Liang R, Zhang Y. Inhibition of cyclin-dependent kinase 5 activity alleviates diabetes-related cognitive deficits. FASEB J 2019; 33:14506-14515. [PMID: 31689375 DOI: 10.1096/fj.201901292r] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Cognitive deficit is a prevalent and underestimated complication of diabetes, and the underlying cellular and molecular mechanisms are not well understood. Aberrant activity of cyclin-dependent kinase (Cdk)5 is implicated in a number of neurodegenerative diseases. The present study examined the role of Cdk5 in the progression of diabetes-related cognitive deficits. We showed that the Cdk5 protein expression and kinase activity were significantly increased in diabetic mice at 16 wk. In primary cultured hippocampal neurons exposed to 30 mM glucose, Cdk5 protein and kinase activity were also elevated in a time-dependent manner. Moreover, the high glucose exposure led to an aberrant Cdk5 activation due to its activator p25 that was cleaved from p35 by calpain. Both in diabetic mice and in cultured hippocampal neurons exposed to high glucose, inhibition of Cdk5 activity with roscovitine (Ros) or short hairpin RNA (shRNA) decreased the protein levels of cleaved caspase-3 and the ratio of Bax and Bcl-2. The apoptotic rate detected by TUNEL in vivo or Annexin V and propidium iodide staining for flow cytometry in vitro also had obvious reduction. In addition, high glucose exposure resulted in the increase of phosphorylated (phospho)-MAPK kinase (MKK)6, phospho-p38, and c-Jun, which were rescued by Ros or Cdk5 shRNA. It is more important that the cognitive deficits of diabetic mice were also effectively alleviated by Ros. These results indicate that aberrant Cdk5 activity triggered hippocampal neuron apoptosis by activating MKK6/p38 MAPK cascade in hyperglycemia. Inhibition of Cdk5 overactivation attenuates neuronal apoptosis and cognitive deficits and contributes to the relief of diabetic neurotoxicity in the brain.-Liu, W., Zhou, Y., Liang, R., Zhang, Y. Inhibition of cyclin-dependent kinase 5 activity alleviates diabetes-related cognitive deficits.
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Affiliation(s)
- Wei Liu
- Department of Pathology, Hebei Medical University, Shijiazhuang, China
| | - Yi Zhou
- Department of Neurology, The Second Hospital of Hebei Medical University, Hebei Medical University, Shijiazhuang, China
| | - Rui Liang
- Department of Pathology, Hebei Medical University, Shijiazhuang, China
| | - Yue Zhang
- Department of Clinical Diagnostics, Hebei Medical University, Shijiazhuang, China
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40
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Eldahshan W, Fagan SC, Ergul A. Inflammation within the neurovascular unit: Focus on microglia for stroke injury and recovery. Pharmacol Res 2019; 147:104349. [PMID: 31315064 PMCID: PMC6954670 DOI: 10.1016/j.phrs.2019.104349] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 06/20/2019] [Accepted: 07/10/2019] [Indexed: 12/11/2022]
Abstract
Neuroinflammation underlies the etiology of multiple neurodegenerative diseases and stroke. Our understanding of neuroinflammation has evolved in the last few years and major players have been identified. Microglia, the brain resident macrophages, are considered sentinels at the forefront of the neuroinflammatory response to different brain insults. Interestingly, microglia perform other physiological functions in addition to their role in neuroinflammation. Therefore, an updated approach in which modulation, rather than complete elimination of microglia is necessary. In this review, the emerging roles of microglia and their interaction with different components of the neurovascular unit are discussed. In addition, recent data on sex differences in microglial physiology and in the context of stroke will be presented. Finally, the multiplicity of roles assumed by microglia in the pathophysiology of ischemic stroke, and in the presence of co-morbidities such as hypertension and diabetes are summarized.
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Affiliation(s)
- Wael Eldahshan
- Program in Clinical and Experimental Therapeutics, University of Georgia College of Pharmacy, United States; Charlie Norwood VA Medical Center Augusta, GA, United States
| | - Susan C Fagan
- Program in Clinical and Experimental Therapeutics, University of Georgia College of Pharmacy, United States; Charlie Norwood VA Medical Center Augusta, GA, United States
| | - Adviye Ergul
- Ralph Johnson VA Medical Center, Medical University of South Carolina, Charleston, SC, United States; Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC, United States.
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41
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Zhang X, Huang-Fu Z, Lang XY, Chun P, Chi YY, Yuan XY, Wang XG. Pathological and cognitive changes in patients with type 2 diabetes mellitus and comorbid MCI and protective hypoglycemic therapies: a narrative review. Rev Neurosci 2019; 30:757-770. [PMID: 31199776 DOI: 10.1515/revneuro-2018-0083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 01/30/2019] [Indexed: 01/04/2023]
Abstract
Type 2 diabetes mellitus (T2DM) is becoming a significant health issue worldwide. Many studies support the hypothesis that patients with T2DM have a higher-than-expected incidence of mild cognitive impairment (MCI) than individuals without diabetes. Based on the results from recent studies, MCI might be associated with the effects of T2DM on glucose metabolism and brain atrophy. As a narrative review, we will illuminate pathological and cognitive changes in patients with T2DM and comorbid MCI and protective hypoglycemic therapies. The early abnormal signs of cognition must be elucidated, and extensive investigations are needed to develop improved therapies for use in the clinic.
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Affiliation(s)
- Xiao Zhang
- The First Affiliated Hospital of Dalian Medical University, Dalian 116000, P.R. China
| | - Zhao Huang-Fu
- The Second Affiliated Hospital of Dalian Medical University, Dalian 116027, P.R. China
| | - Xing-Ying Lang
- Dalian Center for Disease Control and Prevention, Dalian 116021, P.R. China
| | - Pu Chun
- Department of Anatomy, College of Basic Medicine, Dalian Medical University, Dalian 16044, P.R. China
| | - Yan-Yan Chi
- Department of Anatomy, College of Basic Medicine, Dalian Medical University, Dalian 16044, P.R. China
| | - Xiao-Ying Yuan
- Department of Anatomy, College of Basic Medicine, Dalian Medical University, Dalian 16044, P.R. China
| | - Xu-Gang Wang
- Department of Neurology, The Second Affiliated Hospital of Dalian Medical University, Dalian 116027, P.R. China
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Borzì AM, Condorelli G, Biondi A, Basile F, Vicari ESD, Buscemi C, Luca S, Vacante M. Effects of vildagliptin, a DPP-4 inhibitor, in elderly diabetic patients with mild cognitive impairment. Arch Gerontol Geriatr 2019; 84:103896. [PMID: 31204117 DOI: 10.1016/j.archger.2019.06.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Revised: 06/02/2019] [Accepted: 06/02/2019] [Indexed: 01/06/2023]
Abstract
INTRODUCTION There is an unclear association between type 2 diabetes and mild cognitive impairment in the elderly. Both diseases are more prevalent in the older adults compared to the younger counterpart. Some anti-diabetic drugs seem to influence positively the evolution of mild cognitive impairment. This retrospective study investigated the effect of vildagliptin, an inhibitor of the enzyme dipeptidyl peptidase-4 (DPP-4), on the cognitive functioning of elderly diabetic patients with mild cognitive impairment (MCI) documented at mini mental state examination (MMSE). METHODS We included 60 diabetic elderly people which were divided in 2 groups: Group A, 30 patients with HbA1c (glycated hemoglobin) ≤7.5% and treated with metformin, and Group B, 30 patients with HbA1c >7.5%, and treated with metformin plus vildagliptin. We collected data on MMSE, fasting plasma glucose (FPG) and HbA1c at baseline and after 180 ± 10 days from the beginning of treatment. RESULTS The two groups exhibited significantly different values in FPG (P < 0.05) and HbA1c (P < 0.01) at baseline, and in MMSE score (P < 0.001) after treatment. The intragroup comparison showed a significant (P < 0.05) reduction in MMSE score in group A, and in HbA1c (P = 0.01) in group B. CONCLUSION Vildagliptin in addition to metformin resulted in the maintenance of MMSE score, showing a protecting role on cognitive functioning compared to the metformin only group.
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Affiliation(s)
- Antonio Maria Borzì
- Department of Clinical and Experimental Medicine, Specialization School in Geriatrics, University of Catania, AOU Policlinico, Catania, Italy.
| | - Giovanni Condorelli
- Department of Clinical and Experimental Medicine, Specialization School in Geriatrics, University of Catania, AOU Policlinico, Catania, Italy.
| | - Antonio Biondi
- Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy.
| | - Francesco Basile
- Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy.
| | - Enzo Saretto Dante Vicari
- Department of Clinical and Experimental Medicine, Specialization School in Geriatrics, University of Catania, AOU Policlinico, Catania, Italy.
| | - Carola Buscemi
- Department of Clinical and Experimental Medicine, Specialization School in Geriatrics, University of Catania, AOU Policlinico, Catania, Italy.
| | - Salvatore Luca
- Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy.
| | - Marco Vacante
- Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy.
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43
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Fouda AY, Fagan SC, Ergul A. Brain Vasculature and Cognition. Arterioscler Thromb Vasc Biol 2019; 39:593-602. [PMID: 30816798 PMCID: PMC6540805 DOI: 10.1161/atvbaha.118.311906] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 02/15/2019] [Indexed: 12/18/2022]
Abstract
There is a complex interaction between the brain and the cerebral vasculature to meet the metabolic demands of the brain for proper function. Preservation of cerebrovascular function and integrity has a central role in this sophisticated communication within the brain, and any derangements can have deleterious acute and chronic consequences. In almost all forms of cognitive impairment, from mild to Alzheimer disease, there are changes in cerebrovascular function and structure leading to decreased cerebral blood flow, which may initiate or worsen cognitive impairment. In this focused review, we discuss the contribution of 2 major vasoactive pathways to cerebrovascular dysfunction and cognitive impairment in an effort to identify early intervention strategies.
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Affiliation(s)
- Abdelrahman Y. Fouda
- Vascular Biology Center, Augusta University, GA
- Charlie Norwood VA Medical Center Augusta, GA
| | - Susan C. Fagan
- Program in Clinical and Experimental Therapeutics, University of Georgia College of Pharmacy, GA
- Charlie Norwood VA Medical Center Augusta, GA
| | - Adviye Ergul
- Ralph Johnson Veterans Administration Medical Center, Medical University of South Carolina, Charleston, SC
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC
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Disturbed neurovascular coupling in type 2 diabetes mellitus patients: Evidence from a comprehensive fMRI analysis. NEUROIMAGE-CLINICAL 2019; 22:101802. [PMID: 30991623 PMCID: PMC6447740 DOI: 10.1016/j.nicl.2019.101802] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 03/12/2019] [Accepted: 03/26/2019] [Indexed: 02/08/2023]
Abstract
Background Previous studies presumed that the disturbed neurovascular coupling to be a critical risk factor of cognitive impairments in type 2 diabetes mellitus (T2DM), but distinct clinical manifestations were lacked. Consequently, we decided to investigate the neurovascular coupling in T2DM patients by exploring the MRI relationship between neuronal activity and the corresponding cerebral blood perfusion. Methods Degree centrality (DC) map and amplitude of low-frequency fluctuation (ALFF) map were used to represent neuronal activity. Cerebral blood flow (CBF) map was used to represent cerebral blood perfusion. Correlation coefficients were calculated to reflect the relationship between neuronal activity and cerebral blood perfusion. Results At the whole gray matter level, the manifestation of neurovascular coupling was investigated by using 4 neurovascular biomarkers. We compared these biomarkers and found no significant changes. However, at the brain region level, neurovascular biomarkers in T2DM patients were significantly decreased in 10 brain regions. ALFF-CBF in left hippocampus and fractional ALFF-CBF in left amygdala were positively associated with the executive function, while ALFF-CBF in right fusiform gyrus was negatively related to the executive function. The disease severity was negatively related to the memory and executive function. The longer duration of T2DM was related to the milder depression, which suggests T2DM-related depression may not be a physiological condition but be a psychological condition. Conclusion Correlations between neuronal activity and cerebral perfusion maps may be a method for detecting neurovascular coupling abnormalities, which could be used for diagnosis in the future. Trial registry number: This study has been registered in ClinicalTrials.gov (NCT02420470) on April 2, 2015 and published on July 29, 2015. Multi-modal MRI is a method to reflect neurovascular coupling condition. Neurovascular coupling dysfunction was found in diabetics. The memory, executive function and emotion were disrupted in diabetics. The limbic system, basal ganglia, and prefrontal lobe was damaged in diabetics.
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Wang XP, Ye P, Lv J, Zhou L, Qian ZY, Huang YJ, Mu ZH, Wang X, Liu XJ, Wan Q, Yang ZH, Wang F, Zou YY. Expression Changes of NMDA and AMPA Receptor Subunits in the Hippocampus in rats with Diabetes Induced by Streptozotocin Coupled with Memory Impairment. Neurochem Res 2019; 44:978-993. [PMID: 30747310 DOI: 10.1007/s11064-019-02733-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 12/11/2018] [Accepted: 01/14/2019] [Indexed: 11/30/2022]
Abstract
Cognitive impairment in diabetes (CID) is a severe chronic complication of diabetes mellitus (DM). It has been hypothesized that diabetes can lead to cognitive dysfunction due to expression changes of excitatory neurotransmission mediated by N-methyl-D-aspartate receptors (NMDAR) and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR); however, the pathogenesis involved in this has not been fully understood, especially at early phase of DM. Here, we sought to determine the cognitive changes and aim to correlate this with the expression changes of NMDAR and AMPAR of glutamate signaling pathways in the rat hippocampus from early phase of DM and in the course of the disease progression. By Western blot analysis and immunofluorescence labeling, the hippocampus in diabetic rats showed a significant increase in protein expression NMDAR subunits NR1, NR2A and NR2B and AMPAR subunit GluR1. Along with this, behavioral test by Morris water maze showed a significant decline in their performance when compared with the control rats. It is suggested that NR1, NR2A, NR2B and GluR1are involved in learning and memory and that their expression alterations maybe correlated with the occurrence and development of CID in diabetic rats induced by streptozotocin.
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Affiliation(s)
- Xiao-Peng Wang
- Department of Pathology and Pathophysiology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China.,Drug Rehabilitation Center, Huaixian Street, Datong, 038300, Shanxi, People's Republic of China
| | - Pin Ye
- Department of Human Anatomy and Histology/Embryology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China
| | - Jiao Lv
- Department of Pathology and Pathophysiology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China
| | - Lei Zhou
- The Key Laboratory of Stem Cell and Regenerative Medicine of Yunnan Province, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China
| | - Zhong-Yi Qian
- Department of Morphological Laboratory, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China
| | - Yong-Jie Huang
- Department of Pathology and Pathophysiology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China.,Emergency Department, First Affiliated Hospital of Kunming, Medical University, 295 Xi Chang Road, Kunming, 650032, People's Republic of China
| | - Zhi-Hao Mu
- Department of Pathology and Pathophysiology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China
| | - Xie Wang
- Department of Pathology and Pathophysiology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China
| | - Xin-Jie Liu
- Department of Pathology and Pathophysiology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China.,Undergraduate of Batch 2016 in Clinical Medicine Major, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China
| | - Qi Wan
- Institute of Neuroregeneration & Neurorehabilitation, Department of Neurosurgery of the Affiliated Hospital, Qingdao University, Qingdao, 266071, People's Republic of China
| | - Zhi-Hong Yang
- Department of Pathology and Pathophysiology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China.
| | - Fang Wang
- Department of Pathology and Pathophysiology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China.
| | - Ying-Ying Zou
- Department of Pathology and Pathophysiology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, People's Republic of China.
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The predictive value of serum p-CREB level on secondary cognitive impairment in patients with mild-to-moderate craniocerebral trauma. Neurosurg Rev 2019; 42:715-720. [DOI: 10.1007/s10143-018-01072-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 12/07/2018] [Accepted: 12/12/2018] [Indexed: 12/15/2022]
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47
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Ward R, Abdul Y, Ergul A. Endothelin-1 inhibition improves the mBDNF/proBDNF ratio in endothelial cells and HT22 neurons under high glucose/palmitate growth conditions. Physiol Res 2018; 67:S237-S246. [PMID: 29947543 DOI: 10.33549/physiolres.933837] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Diabetes increases the risk and worsens the progression of cognitive impairment. The hippocampus is an important domain for learning and memory. We previously showed that endothelin-1 (ET-1) reduced diabetes-induced inflammation in hippocampal neurons, suggesting a neuroprotective effect. Given that neurons and endothelial cells within the neurovascular unit depend on each other for proper function, we investigated the effect of ET-1 on brain-derived neurotrophic factor (BDNF) synthesis, a key neurotrophin and prosurvival factor, in neuronal (HT22 hippocampal neurons) and brain microvascular endothelial (BMEC-5i) cells under normal and diabetes-mimicking (high glucose plus palmitate) conditions. Cells were treated with exogenous ET-1 or ET receptor antagonists including ET(B) receptor selective antagonist BQ788 (1 microM) or dual-receptor antagonist bosentan (10 microM). Mature (m)BDNF, proBDNF and caspase-3 levels were measured by Western blotting. Diabetic conditions reduced the prosurvival mBDNF/proBDNF ratio in both HT22 and BMEC-5i cells. Addition of exogenous ET-1 had no effect on the BDNF system in HT22 cells in diabetic conditions. Both HT22 and BMEC-5i cells had an increase in the mBDNF/proBDNF ratio when grown in diabetes-simulating conditions in the presence of endothelin receptor inhibition. These data suggest that blockade of ET-1 may provide neuroprotection to hippocampal cells through the modulation of the BDNF system.
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Affiliation(s)
- R Ward
- Department of Neuroscience and Regenerative Medicine and Department of Physiology, Augusta University, Augusta, GA, USA.
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48
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Li W, Abdul Y, Ward R, Ergul A. Endothelin and diabetic complications: a brain-centric view. Physiol Res 2018; 67:S83-S94. [PMID: 29947530 DOI: 10.33549/physiolres.933833] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The global epidemic of diabetes is of significant concern. Diabetes associated vascular disease signifies the principal cause of morbidity and mortality in diabetic patients. It is also the most rapidly increasing risk factor for cognitive impairment, a silent disease that causes loss of creativity, productivity, and quality of life. Small vessel disease in the cerebral vasculature plays a major role in the pathogenesis of cognitive impairment in diabetes. Endothelin system, including endothelin-1 (ET-1) and the receptors (ET(A) and ET(B)), is a likely candidate that may be involved in many aspects of the diabetes cerebrovascular disease. In this review, we took a brain-centric approach and discussed the role of the ET system in cerebrovascular and cognitive dysfunction in diabetes.
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Affiliation(s)
- W Li
- Charlie Norwood Veterans Affairs Medical Center, Augusta, Georgia, USA, Department of Physiology, Augusta University, Augusta, Georgia, USA.
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49
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Sanborn VE, Spitznagel MB, Crosby R, Steffen K, Mitchell J, Gunstad J. Cognitive function and quality of life in bariatric surgery candidates. Surg Obes Relat Dis 2018; 14:1396-1401. [PMID: 30049594 PMCID: PMC6165683 DOI: 10.1016/j.soard.2018.06.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 06/02/2018] [Accepted: 06/09/2018] [Indexed: 11/27/2022]
Abstract
BACKGROUND Both poor quality of life (QoL) and cognitive impairment are common in persons with severe obesity. Work in other patient populations show that cognitive impairment is associated with poorer QoL, though this possibility has not been examined in bariatric surgery candidates. OBJECTIVES We sought to determine the association between cognitive performance and QoL, both total and work related, in a sample of bariatric surgery candidates. SETTING Three sites were used for data collection, including the Neuropsychiatric Research Institute in Fargo, North Dakota, Columbia University in New York, and Cornell University in New York. METHODS Sixty participants from the Longitudinal Assessment of Bariatric Surgery project were assessed at preoperative baseline. RESULTS Hierarchical regression analyses showed that poorer cognitive function was independently associated with lower total QoL and that both reported and objectively measured cognitive impairment were associated with poorer work-related QoL. CONCLUSIONS These preliminary findings suggest that cognitive impairment may contribute to poorer total and work-related QoL in bariatric surgery candidates. Future studies should examine whether interventions to improve cognitive function can improve QoL and other outcomes in this population.
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Affiliation(s)
| | | | - Ross Crosby
- Neuropsychiatric Research Institute, Fargo, North Dakota, United States
| | - Kristine Steffen
- School of Pharmacy, North Dakota State University, Fargo, North Dakota, United States
| | - James Mitchell
- Neuropsychiatric Research Institute, Fargo, North Dakota, United States
| | - John Gunstad
- Psychological Sciences, Kent State University, Kent, Ohio, United States
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50
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Zhao L, Dong M, Wang D, Ren M, Zheng Y, Zheng H, Li C, Gao H. Characteristic Metabolic Alterations Identified in Primary Neurons Under High Glucose Exposure. Front Cell Neurosci 2018; 12:207. [PMID: 30065632 PMCID: PMC6056731 DOI: 10.3389/fncel.2018.00207] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 06/25/2018] [Indexed: 12/29/2022] Open
Abstract
Cognitive dysfunction is a central nervous system (CNS) complication of diabetes mellitus (DM) that is characterized by impaired memory and cognitive ability. An in-depth understanding of metabolic alterations in the brain associated with DM will facilitate our understanding of the pathogenesis of cognitive dysfunction. The present study used an in vitro culture of primary neurons in a high-glucose (HG) environment to investigate characteristic alterations in neuron metabolism using nuclear magnetic resonance (NMR)-based metabonomics. High performance liquid chromatography (HPLC) was also used to measure changes in the adenosine phosphate levels in the hippocampal regions of streptozotocin (STZ)-induced diabetic rats. Our results revealed significant elevations in phosphocholine and ATP production in neurons and decreased formate, nicotinamide adenine dinucleotide (NAD+), tyrosine, methionine, acetate and phenylalanine levels after HG treatment. However, the significant changes in lactate, glutamate, taurine and myo-inositol levels in astrocytes we defined previously in astrocytes, were not found in neurons, suggested cell-specific metabolic alterations. We also confirmed an astrocyte-neuron lactate shuttle between different compartments in the brain under HG conditions, which was accompanied by abnormal acetate transport. These alterations reveal specific information on the metabolite levels and transport processes related to neurons under diabetic conditions. Our findings contribute to the understanding of the metabolic alterations and underlying pathogenesis of cognitive decline in diabetic patients.
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Affiliation(s)
- Liangcai Zhao
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Minjian Dong
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Dan Wang
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Mengqian Ren
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Yongquan Zheng
- Department of Pharmacy, Women's Hospital, Medicine of School, Zhejiang University, Hangzhou, China
| | - Hong Zheng
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Chen Li
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Hongchang Gao
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
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