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Son Y, Yeo IJ, Hong JT, Eo SK, Lee D, Kim K. Side-Chain Immune Oxysterols Induce Neuroinflammation by Activating Microglia. Int J Mol Sci 2023; 24:15288. [PMID: 37894967 PMCID: PMC10607006 DOI: 10.3390/ijms242015288] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 10/17/2023] [Accepted: 10/17/2023] [Indexed: 10/29/2023] Open
Abstract
In individuals with Alzheimer's disease, the brain exhibits elevated levels of IL-1β and oxygenated cholesterol molecules (oxysterols). This study aimed to investigate the effects of side-chain oxysterols on IL-1β expression using HMC3 microglial cells and ApoE-deficient mice. Treatment of HMC3 cells with 25-hydroxycholesterol (25OHChol) and 27-hydroxycholesterol (27OHChol) led to increased IL-1β expression at the transcript and protein levels. Additionally, these oxysterols upregulated the surface expression of MHC II, a marker of activated microglia. Immunohistochemistry performed on the mice showed increased microglial expression of IL-1β and MHC II when fed a high-cholesterol diet. However, cholesterol and 24s-hydroxycholesterol did not increase IL-1β transcript levels or MHC II expression. The extent of IL-1β increase induced by 25OHChol and 27OHChol was comparable to that caused by oligomeric β-amyloid, and the IL-1β expression induced by the oxysterols was not impaired by polymyxin B, which inhibited lipopolysaccharide-induced IL-1β expression. Both oxysterols enhanced the phosphorylation of Akt, ERK, and Src, and inhibition of these kinase pathways with pharmacological inhibitors suppressed the expression of IL-1β and MHC II. The pharmacological agents chlorpromazine and cyclosporin A also impaired the oxysterol-induced expression of IL-1β and upregulation of MHC II. Overall, these findings suggest that dysregulated cholesterol metabolism leading to elevated levels of side-chain oxysterols, such as 25OHChol and 27OHChol, can activate microglia to secrete IL-1β through a mechanism amenable to pharmacologic intervention. The activation of microglia and subsequent neuroinflammation elicited by the immune oxysterols can contribute to the development of neurodegenerative diseases.
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Affiliation(s)
- Yonghae Son
- Department of Pharmacology, School of Medicine, Pusan National University, Yangsan 50612, Gyeongnam, Republic of Korea;
| | - In-Jun Yeo
- College of Pharmacy, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Gyeongbuk, Republic of Korea;
- College of Pharmacy and Medical Research Center, Chungbuk National University, Osong-eup, Heungdeok-gu, Cheongju 28160, Chungbuk, Republic of Korea;
| | - Jin-Tae Hong
- College of Pharmacy and Medical Research Center, Chungbuk National University, Osong-eup, Heungdeok-gu, Cheongju 28160, Chungbuk, Republic of Korea;
| | - Seong-Kug Eo
- College of Veterinary Medicine and Bio-Safety Research Institute, Jeonbuk National University, Iksan 54596, Jeonbuk, Republic of Korea;
| | - Dongjun Lee
- Department of Convergence Medicine, School of Medicine, Pusan National University, Yangsan 50612, Gyeongnam, Republic of Korea
| | - Koanhoi Kim
- Department of Pharmacology, School of Medicine, Pusan National University, Yangsan 50612, Gyeongnam, Republic of Korea;
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Shepilov D, Kovalenko T, Osadchenko I, Smozhanyk K, Marungruang N, Ushakova G, Muraviova D, Hållenius F, Prykhodko O, Skibo G. Varying Dietary Component Ratios and Lingonberry Supplementation May Affect the Hippocampal Structure of ApoE–/– Mice. Front Nutr 2022; 9:565051. [PMID: 35252286 PMCID: PMC8890029 DOI: 10.3389/fnut.2022.565051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 01/11/2022] [Indexed: 11/28/2022] Open
Abstract
Objective This study aimed to investigate and compare the morphological and biochemical characteristics of the hippocampus and the spatial memory of young adult ApoE–/– mice on a standard chow diet, a low-fat diet (LFD), a high-fat diet (HFD), and an HFD supplemented with lingonberries. Methods Eight-week-old ApoE–/– males were divided into five groups fed standard chow (Control), an LFD (LF), an HFD (HF), and an HFD supplemented with whole lingonberries (HF+WhLB) or the insoluble fraction of lingonberries (HF+InsLB) for 8 weeks. The hippocampal cellular structure was evaluated using light microscopy and immunohistochemistry; biochemical analysis and T-maze test were also performed. Structural synaptic plasticity was assessed using electron microscopy. Results ApoE–/– mice fed an LFD expressed a reduction in the number of intact CA1 pyramidal neurons compared with HF+InsLB animals and the 1.6–3.8-fold higher density of hyperchromic (damaged) hippocampal neurons relative to other groups. The LF group had also morphological and biochemical indications of astrogliosis. Meanwhile, both LFD- and HFD-fed mice demonstrated moderate microglial activation and a decline in synaptic density. The consumption of lingonberry supplements significantly reduced the microglia cell area, elevated the total number of synapses and multiple synapses, and increased postsynaptic density length in the hippocampus of ApoE–/– mice, as compared to an LFD and an HFD without lingonberries. Conclusion Our results suggest that, in contrast to the inclusion of fats in a diet, increased starch amount (an LFD) and reduction of dietary fiber (an LFD/HFD) might be unfavorable for the hippocampal structure of young adult (16-week-old) male ApoE–/– mice. Lingonberries and their insoluble fraction seem to provide a neuroprotective effect on altered synaptic plasticity in ApoE–/– animals. Observed morphological changes in the hippocampus did not result in notable spatial memory decline.
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Affiliation(s)
- Dmytro Shepilov
- Department of Cytology, Bogomoletz Institute of Physiology, Kyiv, Ukraine
- *Correspondence: Dmytro Shepilov
| | - Tatiana Kovalenko
- Department of Cytology, Bogomoletz Institute of Physiology, Kyiv, Ukraine
| | - Iryna Osadchenko
- Department of Cytology, Bogomoletz Institute of Physiology, Kyiv, Ukraine
| | - Kateryna Smozhanyk
- Department of Cytology, Bogomoletz Institute of Physiology, Kyiv, Ukraine
| | - Nittaya Marungruang
- Department of Food Technology, Engineering and Nutrition, Lund University, Lund, Sweden
| | - Galyna Ushakova
- Department of Biochemistry and Physiology, Oles Honchar Dnipro National University, Dnipro, Ukraine
| | - Diana Muraviova
- Department of Biochemistry and Physiology, Oles Honchar Dnipro National University, Dnipro, Ukraine
| | - Frida Hållenius
- Department of Food Technology, Engineering and Nutrition, Lund University, Lund, Sweden
| | - Olena Prykhodko
- Department of Food Technology, Engineering and Nutrition, Lund University, Lund, Sweden
| | - Galyna Skibo
- Department of Cytology, Bogomoletz Institute of Physiology, Kyiv, Ukraine
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Kefir peptides alleviate high-fat diet-induced atherosclerosis by attenuating macrophage accumulation and oxidative stress in ApoE knockout mice. Sci Rep 2020; 10:8802. [PMID: 32472055 PMCID: PMC7260220 DOI: 10.1038/s41598-020-65782-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 05/11/2020] [Indexed: 02/01/2023] Open
Abstract
In the past decade, the high morbidity and mortality of atherosclerotic disease have been prevalent worldwide. High-fat food consumption has been suggested to be an overarching factor for atherosclerosis incidence. This study aims to investigate the effects of kefir peptides on high-fat diet (HFD)-induced atherosclerosis in apolipoprotein E knockout (ApoE−/−) mice. 7-week old male ApoE−/− and normal C57BL/6 mice were randomly divided into five groups (n = 8). Atherosclerotic lesion development in ApoE−/− mice was established after fed the HFD for 12 weeks compared to standard chow diet (SCD)-fed C57BL/6 and ApoE−/− control groups. Kefir peptides oral administration significantly improved atherosclerotic lesion development by protecting against endothelial dysfunction, decreasing oxidative stress, reducing aortic lipid deposition, attenuating macrophage accumulation, and suppressing the inflammatory immune response compared with the HFD/ApoE−/− mock group. Moreover, the high dose of kefir peptides substantially inhibited aortic fibrosis and restored the fibrosis in the aorta root close to that observed in the C57BL/6 normal control group. Our findings show, for the first time, anti-atherosclerotic progression via kefir peptides consumption in HFD-fed ApoE−/− mice. The profitable effects of kefir peptides provide new perspectives for its use as an anti-atherosclerotic agent in the preventive medicine.
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Ylilauri MP, Voutilainen S, Lönnroos E, Mursu J, Virtanen HE, Koskinen TT, Salonen JT, Tuomainen TP, Virtanen JK. Association of dietary cholesterol and egg intakes with the risk of incident dementia or Alzheimer disease: the Kuopio Ischaemic Heart Disease Risk Factor Study. Am J Clin Nutr 2017; 105:476-484. [PMID: 28052883 DOI: 10.3945/ajcn.116.146753] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Accepted: 12/01/2016] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND There is little information about the associations of intakes of cholesterol and eggs, a major source of dietary cholesterol, with the risk of cognitive decline in general populations or in carriers of apolipoprotein E ɛ4 (APO-E4), a major risk factor for dementia. OBJECTIVE We investigated the associations of cholesterol and egg intakes with incident dementia, Alzheimer disease (AD), and cognitive performance in middle-aged and older men from Eastern Finland. DESIGN A total of 2497 dementia-free men, aged 42-60 y in 1984-1989 at the baseline examinations of the prospective, population-based Kuopio Ischaemic Heart Disease Risk Factor Study, were included in the study. Information on the apolipoprotein E (Apo-E) phenotype was available for 1259 men. Data on cognitive performance tests at the 4-y re-examinations were available for 480 men. Dietary intakes were assessed with the use of 4-d food records at baseline. Dementia and AD diagnoses were based on Finnish health registers. Cox regression and ANCOVA were used for the analyses. RESULTS During the 21.9-y follow-up, 337 men were diagnosed with dementia, and 266 men were diagnosed with AD. Neither cholesterol nor egg intake was associated with a higher risk of incident dementia or AD. For example, when evaluated continuously, each intake of 100 mg cholesterol/d was associated with a multivariable-adjusted HR of 0.90 (95% CI: 0.79, 1.02) for incident dementia, and each additional 0.5 egg (27 g)/d was associated with an HR of 0.89 (95% CI: 0.78, 1.01). However, egg intake was associated with better performance on neuropsychological tests of the frontal lobe and executive functioning, the Trail Making Test, and the Verbal Fluency Test. The Apo-E4 phenotype did not modify the associations of cholesterol or egg intake (P-interactions > 0.11). CONCLUSIONS Neither cholesterol nor egg intake is associated with an increased risk of incident dementia or AD in Eastern Finnish men. Instead, moderate egg intake may have a beneficial association with certain areas of cognitive performance.
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Affiliation(s)
- Maija Pt Ylilauri
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; and
| | - Sari Voutilainen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; and
| | - Eija Lönnroos
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; and
| | - Jaakko Mursu
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; and
| | - Heli Ek Virtanen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; and
| | - Timo T Koskinen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; and
| | - Jukka T Salonen
- Department of Public Health, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Tomi-Pekka Tuomainen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; and
| | - Jyrki K Virtanen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland; and
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Yanev S, Aloe L, Fiore M, Chaldakov GN. Neurotrophic and metabotrophic potential of nerve growth factor and brain-derived neurotrophic factor: Linking cardiometabolic and neuropsychiatric diseases. World J Pharmacol 2013; 2:92-99. [DOI: 10.5497/wjp.v2.i4.92] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 09/20/2013] [Accepted: 10/16/2013] [Indexed: 02/06/2023] Open
Abstract
One of biggest recent achievements of neurobiology is the study on neurotrophic factors. The neurotrophins are exciting examples of these factors. They belong to a family of proteins consisting of nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), neurotrophin-3 (NT-3), NT-4/5, NT-6, and NT-7. Today, NGF and BDNF are well recognized to mediate a dizzying number of trophobiological effects, ranging from neurotrophic through immunotrophic and epitheliotrophic to metabotrophic effects. These are implicated in the pathogenesis of various diseases. In the same vein, recent studies in adipobiology reveal that this tissue is the body’s largest endocrine and paracrine organ producing multiple signaling proteins collectively termed adipokines, with NGF and BDNF being also produced from adipose tissue. Altogether, neurobiology and adipobiology contribute to the improvement of our knowledge on diseases beyond obesity such as cardiometabolic (atherosclerosis, type 2 diabetes, and metabolic syndrome) and neuropsychiatric (e.g., Alzheimer’s disease and depression) diseases. The present review updates evidence for (1) neurotrophic and metabotrophic potentials of NGF and BDNF linking the pathogenesis of these diseases, and (2) NGF- and BDNF-mediated effects in ampakines, NMDA receptor antagonists, antidepressants, selective deacetylase inhibitors, statins, peroxisome proliferator-activated receptor gamma agonists, and purinergic P2X3 receptor up-regulation. This may help to construct a novel paradigm in the field of translational pharmacology of neuro-metabotrophins, particularly NGF and BDNF.
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Popa-Wagner A, Furczyk K, Richter J, Irmisch G, Thome J. Neurotrophin levels at admission did not change significantly upon alcohol deprivation and were positively correlated with the BMI and LDL levels. J Mol Psychiatry 2013; 1:20. [PMID: 25408911 PMCID: PMC4223886 DOI: 10.1186/2049-9256-1-20] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2012] [Accepted: 11/05/2013] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND The neurotrophins brain-derived neurotrophic factor (BDNF) and neurotrophic factor 3 (NT3) could play a role in addictive behavior. Interactions between BDNF and dopamine transmission influence the alcohol intake. It has been hypothesized that extensive alcohol consumption leads to diminished circulating BDNF levels and impaired BDNF-mediated protective mechanisms. What is more, alcohol dependency causes changes in lipid metabolism which in turn may influence the neurotrophin system. METHODS In this study, we tested the hypothesis that alcohol withdrawal increases the serum levels of BDNF in alcoholic patients and investigated correlations between serum BDNF and NT3 and alcohol in breath as well as with the body-mass-index (BMI), lipoprotein profiles and lifestyle factors in 110 male in-patients diagnosed with alcohol addiction on the first day after admission and at discharge. RESULTS The intoxication level (alcohol in breath at admission) was significantly correlated with liver enzymes and BDNF concentrations (R = .28; p = .004). Patients with positive breath-alcohol test at admission had about 9 times higher NT3 levels and higher liver enzyme concentration levels than nonintoxicated subjects. Alcohol intoxicated patients with pathological aspartate aminase (ASAT) levels had even higher NT3 level (F = 5.41; p = .022). The concentration of NT3 was positively associated with the (BMI) (admission R = .36; p = .004; discharge R = .33; p = .001), and the obese patients had 3 to 5 times higher NT3 concentration than the others. Low-density lipoprotein (LDL) concentration levels were found to positively correlate with NT3 concentration levels (admission R = .025; p = .015 discharge R = .24; p = .23). CONCLUSION Other than expected, the levels of NT3 and to a lesser extent BDNF levels, were found to be significantly increased in acute alcohol abuse. Alcohol deprivation did not significantly change the serum neurotrophin levels at admission. NT3 levels were positively correlated with the BMI and LDL levels. Because of expected difference between genders, we recommend investigating these correlations further in patients of both genders.
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Affiliation(s)
- Aurel Popa-Wagner
- Clinic for Psychiatry and Psychotheraphy, University of Medicine Rostock, Rostock, Germany
| | - Karolina Furczyk
- Clinic for Psychiatry and Psychotheraphy, University of Medicine Rostock, Rostock, Germany
| | - Joerg Richter
- Norway Centre for Child and Adolescent Mental Health Eastern and Southern Norway, Oslo, 0405 Norway
| | - Gisela Irmisch
- Clinic for Psychiatry and Psychotheraphy, University of Medicine Rostock, Rostock, Germany
| | - Johannes Thome
- Clinic for Psychiatry and Psychotheraphy, University of Medicine Rostock, Rostock, Germany
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Ohta K, Miki T, Warita K, Suzuki S, Kusaka T, Yakura T, Liu J, Tamai M, Takeuchi Y. Prolonged maternal separation disturbs the serotonergic system during early brain development. Int J Dev Neurosci 2013; 33:15-21. [DOI: 10.1016/j.ijdevneu.2013.10.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 10/18/2013] [Accepted: 10/23/2013] [Indexed: 12/14/2022] Open
Affiliation(s)
- Ken‐ichi Ohta
- Department of Anatomy and NeurobiologyFaculty of MedicineKagawa UniversityKagawaJapan
| | - Takanori Miki
- Department of Anatomy and NeurobiologyFaculty of MedicineKagawa UniversityKagawaJapan
| | - Katsuhiko Warita
- Department of Anatomy and NeurobiologyFaculty of MedicineKagawa UniversityKagawaJapan
- Department of PathologyDivision of Molecular DiagnosticsUniversity of Pittsburgh School of MedicinePittsburghPAUSA
| | - Shingo Suzuki
- Department of Anatomy and NeurobiologyFaculty of MedicineKagawa UniversityKagawaJapan
| | - Takashi Kusaka
- Department of PediatricsFaculty of MedicineKagawa UniversityKagawaJapan
| | - Tomiko Yakura
- Department of Anatomy and NeurobiologyFaculty of MedicineKagawa UniversityKagawaJapan
| | - Jun‐Qian Liu
- Department of Anatomy and NeurobiologyFaculty of MedicineKagawa UniversityKagawaJapan
| | - Motoki Tamai
- Department of Anatomy and NeurobiologyFaculty of MedicineKagawa UniversityKagawaJapan
| | - Yoshiki Takeuchi
- Department of Anatomy and NeurobiologyFaculty of MedicineKagawa UniversityKagawaJapan
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Hohsfield LA, Ehrlich D, Humpel C. Cholesterol diet counteracts repeated anesthesia/infusion-induced cognitive deficits in male Brown Norway rats. Neurobiol Learn Mem 2013; 106:154-62. [PMID: 23973449 DOI: 10.1016/j.nlm.2013.08.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 08/09/2013] [Accepted: 08/16/2013] [Indexed: 11/18/2022]
Abstract
A variety of cardiovascular and cerebrovascular diseases are associated with alterations in cholesterol levels and metabolism. Moreover, convincing evidence shows that high cholesterol diet can lead to learning and memory impairments. On the other hand, a significant body of research has also demonstrated that learning is improved by elevated dietary cholesterol. Despite these conflicting findings, it is clear that cholesterol plays an important role in these cognitive properties. However, it remains unclear how this blood-brain barrier (BBB)-impenetrable molecule affects the brain and under what circumstances it provides either detrimental or beneficial effects to learning and memory. The aim of this study was to characterize the effects of 5% cholesterol diet on six-month-old inbred Brown Norway rats. More important, we sought to examine the role that cholesterol can play when repeated anesthesia and intravenous infusion disrupts cognitive function. This present study supports previous work showing that enriched cholesterol diet leads to significant alterations in neuroinflammation and BBB disruption. Following repeated anesthesia and intravenous infusion of saline we observe that animals under normal diet conditions exhibit significant deficiencies in spatial learning and cholinergic neuron populations compared to animals under enriched cholesterol diet, which do not show such deficiencies. These findings indicate that cholesterol diet can protect against or counteract anesthesia/infusion-induced cognitive deficits. Ultimately, these results suggest that cholesterol homeostasis serves an important functional role in the brain and that altering this homeostasis can either exert positive or negative effects on cognitive properties.
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Affiliation(s)
- Lindsay A Hohsfield
- Laboratory of Psychiatry and Experimental Alzheimer's Research, Department of Psychiatry and Psychotherapy, Innsbruck Medical University, A-6020 Innsbruck, Austria
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