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Pradhan SP, Sahu PK, Behera A. New insights toward molecular and nanotechnological approaches to antidiabetic agents for Alzheimer's disease. Mol Cell Biochem 2023; 478:2739-2762. [PMID: 36949264 DOI: 10.1007/s11010-023-04696-1] [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: 04/20/2022] [Accepted: 02/27/2023] [Indexed: 03/24/2023]
Abstract
Alzheimer's disease (AD) is a chronic neurodegenerative disorder affecting a major class of silver citizens. The disorder shares a mutual relationship on account of its cellular and molecular pathophysiology with type-II diabetes mellitus (DM). Chronic DM increases the risk for AD. Emerging evidence recommended that resistance in insulin production develops cognitive dysfunction, which generally leads to AD. Repurposing of antidiabetic drugs can be effective in preventing and treatment of the neurodegenerative disorder. Limitations of antidiabetic drugs restrict the repurposing of the drugs for other disorders. Therefore, nanotechnological intervention plays a significant role in the treatment of neurological disorders. In this review, we discuss the common cellular and molecular pathophysiologies between AD and type-II DM, the relevance of in vivo models of type II DM in the study of AD, and the repurposing of antidiabetic drugs and the nanodelivery systems of antidiabetic drugs against AD.
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Affiliation(s)
- Sweta Priyadarshini Pradhan
- School of Pharmaceutical Sciences, Siksha 'O' Anusandhan Deemed to be University, Campus-II, Kalinga Nagar, Bhubaneswar, Odisha, India
| | - Pratap Kumar Sahu
- School of Pharmaceutical Sciences, Siksha 'O' Anusandhan Deemed to be University, Campus-II, Kalinga Nagar, Bhubaneswar, Odisha, India
| | - Anindita Behera
- School of Pharmaceutical Sciences, Siksha 'O' Anusandhan Deemed to be University, Campus-II, Kalinga Nagar, Bhubaneswar, Odisha, India.
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2
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Tetramethylpyrazine Attenuates Cognitive Impairment Via Suppressing Oxidative Stress, Neuroinflammation, and Apoptosis in Type 2 Diabetic Rats. Neurochem Res 2022; 47:2431-2444. [PMID: 35665448 DOI: 10.1007/s11064-022-03640-x] [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: 01/12/2022] [Revised: 05/14/2022] [Accepted: 05/17/2022] [Indexed: 10/18/2022]
Abstract
Cognitive dysfunction is an important complication observed in type 2 diabetes mellitus (T2DM) patients. Tetramethylpyrazine (TMP) is known to exhibit anti-diabetic and neuroprotective properties. Therefore, the present study aimed to investigate the possible therapeutic effects of TMP against type 2 diabetes-associated cognitive impairment in rats. High-fat diet (HFD) followed by a low dose of streptozotocin (35 mg/kg) was used to induce diabetes in Sprague-Dawley rats. TMP (20, 40, and 80 mg/kg) and Pioglitazone (10 mg/kg) were administered for 4 weeks. The Morris water maze (MWM) and novel objective recognition task (NOR) tests were used to assess memory function. Fasting blood glucose (FBG), lipid profile, HOMA-IR, glycosylated hemoglobin (HbA1c), and glucose tolerance were measured. Acetylcholinesterase (AChE) and choline acetytransferase (ChAT) activity, acetylcholine (ACh) levels, oxidative stress, apoptotic (Bcl-2, Bax, caspase-3), and inflammatory markers (TNF-α, IL-1β, and NF-kβ) were assessed. BDNF, p-AKT, and p-CREB levels were also measured. In the present work, we observed that treatment of diabetic rats with TMP alleviated learning and memory deficits, improved insulin sensitivity, and attenuated hyperglycemia and dyslipidemia. Furthermore, treatment with TMP increased BDNF, p-Akt, and p-CREB levels, normalized cholinergic dysfunction, and suppressed oxidative, inflammatory, and apoptotic markers in the hippocampus. Collectively, our results suggest that the TMP may be an effective neuroprotective agent in alleviating type 2 diabetes-associated cognitive deficits.
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3
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Regulation of Neuroinflammatory Signaling by PPARγ Agonist in Mouse Model of Diabetes. Int J Mol Sci 2022; 23:ijms23105502. [PMID: 35628311 PMCID: PMC9141386 DOI: 10.3390/ijms23105502] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 05/09/2022] [Accepted: 05/11/2022] [Indexed: 02/01/2023] Open
Abstract
Many relevant studies, as well as clinical practice, confirm that untreated diabetes predisposes the development of neuroinflammation and cognitive impairment. Having regard for the fact that PPARγ are widely distributed in the brain and PPARγ ligands may regulate the inflammatory process, the anti-inflammatory potential of the PPARγ agonist, pioglitazone, was assessed in a mouse model of neuroinflammation related with diabetes. In this regard, the biochemical and molecular indicators of neuroinflammation were determined in the hippocampus and prefrontal cortex of diabetes mice. The levels of cytokines (IL-1β, IL-6, and TNF) and the expression of genes (Tnfrsf1a and Cav1) were measured. In addition, behavioral tests such as the open field test, the hole-board test, and the novel object recognition test were conducted. A 14-day treatment with pioglitazone significantly decreased IL-6 and TNFα levels in the prefrontal cortex and led to the downregulation of Tnfrsf1a expression and the upregulation of Cav1 expression in both brain regions of diabetic mice. Pioglitazone, by targeting neuroinflammatory signaling, improved memory and exploratory activity in behavioral tests. The present study provided a potential theoretical basis and therapeutic target for the treatment of neuroinflammation associated with diabetes. Pioglitazone may provide a promising therapeutic strategy in diabetes patients with muffled of behavioral activity.
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Ekici Ö, Aslan E, Aladağ T, Güzel H, Korkmaz ÖA, Bostancı A, Sadi G, Pektaş MB. Masseter muscle and gingival tissue inflammatory response following treatment with high-fructose corn syrup in rats: Anti-inflammatory and antioxidant effects of kefir. J Food Biochem 2022; 46:e13732. [PMID: 33864286 DOI: 10.1111/jfbc.13732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 03/29/2021] [Accepted: 03/30/2021] [Indexed: 12/17/2022]
Abstract
The aim of the study was to evaluate whether high-fructose corn syrup (HFCS) intake (20% beverages) impacts antioxidative structures and inflammation in the gingival tissue and masseter muscle of rats. Kefir was tested for its potential utility on changes induced by HFCS. Animals were randomly divided into four groups as control, kefir, HFCS, and HFCS plus kefir. HFCS was given as 20% solutions in drinking water while kefir supplementations were given by gastric gavage for 8 weeks. It has been clearly determined that the HFCS diet increased expressions of interleukin (IL)-6, IL-1β, and tumor necrosis factor-α proinflammatory structures via lymphocyte infiltration by suppressing antioxidant enzymes such as catalase, superoxide dismutase, and glutathione peroxidase in both tissues. Kefir improved these undesirable changes in rats fed with HFCS. The results of this current study, the first investigation to examine the effects of kefir on masseter muscle and gingival tissue, may provide new access to the restorative effects of kefir consumption on oral health disorders caused by high fructose in the diet. PRACTICAL APPLICATIONS: In this study, at an early age, the effects of kefir on improving inflammation via antioxidation in the masseter muscle and gingival tissue were investigated for the first time. We showed that kefir feeding ameliorates lymphocyte infiltration on the high-fructose corn syrup (HFCS)-induced masseter muscle and gingival tissue inflammation in rats. The mRNA expressions of inflammatory parameters measured in the study were supported by protein measurements via ELISA or immunohistochemistry. In the present study, kefir may play an important role in the antioxidation and inflammation process on the masseter muscle and gingival tissue against HFCS.
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Affiliation(s)
- Ömer Ekici
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Afyonkarahisar Health Sciences University, Afyonkarahisar, Turkey
| | - Esra Aslan
- Department of Histology and Embryology, Faculty of Medicine, Afyonkarahisar Health Sciences University, Afyonkarahisar, Turkey
| | - Tuğçe Aladağ
- Department of Histology and Embryology, Faculty of Medicine, Afyonkarahisar Health Sciences University, Afyonkarahisar, Turkey
| | - Hilal Güzel
- Department of Anatomy, Faculty of Medicine, Afyonkarahisar Health Sciences University, Afyonkarahisar, Turkey
| | - Ömer Adil Korkmaz
- Department of Chemistry, Faculty of Science, Yildiz Technical University, Istanbul, Turkey
| | - Aykut Bostancı
- Department of Biology, K.Ö. Science Faculty, Karamanoglu Mehmetbey University, Karaman, Turkey
| | - Gökhan Sadi
- Department of Biology, K.Ö. Science Faculty, Karamanoglu Mehmetbey University, Karaman, Turkey
| | - Mehmet Bilgehan Pektaş
- Department of Medical Pharmacology, Faculty of Medicine, Afyonkarahisar Health Sciences University, Afyonkarahisar, Turkey
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Uniyal A, Tiwari V, Gadepalli A, Ummadisetty O, Tiwari V. Epigallocatechin-3-gallate improves chronic alcohol-induced cognitive dysfunction in rats by interfering with neuro-inflammatory, cell death and oxido-nitrosative cascade. Metab Brain Dis 2021; 36:2141-2153. [PMID: 34386880 DOI: 10.1007/s11011-021-00794-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 07/09/2021] [Indexed: 12/21/2022]
Abstract
Alcohol consumption for a longer period of time is linked with neuronal damage and an increase in inflammatory signaling resulting in cell death and dementia. Natural compounds are the focus of research due to their high efficacy and good safety profile. Here we have investigated the effect of chronic epigallocatechin-3-gallate (EGCG) administration against the alcohol-induced cognitive deficit rats. Male Wistar rats were exposed to the 12% ethanol (10 g/kg; oral gavage) for ten weeks and treated with EGCG (25, 50, and 100 mg/kg) for the same duration. Ethanol exposure led to the impaired spatial memory and learning in rats assessed using the Morris water maze and elevated plus-maze test. Further, we assessed the role of EGCG in mitigating the oxidative stress, neuroinflammatory and cell death signaling associated markers. Co-administration with EGCG significantly prevented all the behavioral, biochemical and molecular alterations in the different brain regions of ethanol-treated rats in a dose-dependent manner. EGCG suppressed the acetylcholinesterase activity, increased oxidative-nitrosative stress, cytokines (TNF-alpha and IL-1beta), NF-kappa β and caspase-3 levels in both the cortex and hippocampus of ethanol-treated rats. Our preliminary study demonstrated that EGCG improves the oxido-nitrosative stress, inflammation, and cell death signaling associated with ethanol-induced cognitive dysfunction. This suggests the potential role of EGCG in mitigating the cognitive deficits associated with chronic alcohol consumption.
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Affiliation(s)
- Ankit Uniyal
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi, UP, 221005, India
| | - Vineeta Tiwari
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi, UP, 221005, India
| | - Anagha Gadepalli
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi, UP, 221005, India
| | - Obulapathi Ummadisetty
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi, UP, 221005, India
| | - Vinod Tiwari
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi, UP, 221005, India.
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6
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El Sayed NS, Kandil EA, Ghoneum MH. Enhancement of Insulin/PI3K/Akt Signaling Pathway and Modulation of Gut Microbiome by Probiotics Fermentation Technology, a Kefir Grain Product, in Sporadic Alzheimer's Disease Model in Mice. Front Pharmacol 2021; 12:666502. [PMID: 34366841 PMCID: PMC8346028 DOI: 10.3389/fphar.2021.666502] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 07/02/2021] [Indexed: 02/04/2023] Open
Abstract
Sporadic Alzheimer's disease (AD) is the most common neurodegenerative disorder with cognitive dysfunction. Remarkably, alteration in the gut microbiome and resultant insulin resistance has been shown to be connected to metabolic syndrome, the crucial risk factor for AD, and also to be implicated in AD pathogenesis. Thus, this study, we assessed the efficiency of probiotics fermentation technology (PFT), a kefir product, in enhancing insulin signaling via modulation of gut microbiota to halt the development of AD. We also compared its effectiveness to that of pioglitazone, an insulin sensitizer that has been confirmed to substantially treat AD. AD was induced in mice by a single injection of intracerebroventricular streptozotocin (STZ; 3 mg/kg). PFT (100, 200, 400 mg/kg) and pioglitazone (30 mg/kg) were administered orally for 3 weeks. Behavioral tests were conducted to assess cognitive function, and hippocampal levels of acetylcholine (Ach) and β-amyloid (Aβ1-42) protein were assessed along with histological examination. Moreover, the expression of the insulin receptor, insulin degrading enzyme (IDE), and the phosphorylated forms of phosphoinositide 3-kinase (PI3K), protein kinase B (Akt), glycogen synthase kinase-3β (GSK-3β), mammalian target of rapamycin (mTOR), and tau were detected. Furthermore, oxidative stress and inflammatory biomarkers were estimated. Treatment with PFT reversed STZ-induced neurodegeneration and cognitive impairment, enhanced hippocampal Ach levels, and reduced Aβ1-42 levels after restoration of IDE activity. PFT also improved insulin signaling, as evidenced by upregulation of insulin receptor expression and activation of PI3K/Akt signaling with subsequent suppression of GSK-3β and mTOR signaling, which result in the downregulation of hyperphosphorylated tau. Moreover, PFT significantly diminished oxidative stress and inflammation induced by STZ. These potential effects were parallel to those produced by pioglitazone. Therefore, PFT targets multiple mechanisms incorporated in the pathogenesis of AD and hence might be a beneficial therapy for AD.
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Affiliation(s)
| | - Esraa A. Kandil
- Department of Pharmacology and Toxicology, Cairo University, Cairo, Egypt
| | - Mamdooh H. Ghoneum
- Department of Surgery, Charles R. Drew University of Medicine and Science, Los Angeles, CA, United States
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Wei Z, Koya J, Reznik SE. Insulin Resistance Exacerbates Alzheimer Disease via Multiple Mechanisms. Front Neurosci 2021; 15:687157. [PMID: 34349617 PMCID: PMC8326507 DOI: 10.3389/fnins.2021.687157] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 06/23/2021] [Indexed: 12/12/2022] Open
Abstract
Alzheimer disease (AD) is a chronic neurodegenerative disease that accounts for 60–70% of dementia and is the sixth leading cause of death in the United States. The pathogenesis of this debilitating disorder is still not completely understood. New insights into the pathogenesis of AD are needed in order to develop novel pharmacologic approaches. In recent years, numerous studies have shown that insulin resistance plays a significant role in the development of AD. Over 80% of patients with AD have type II diabetes (T2DM) or abnormal serum glucose, suggesting that the pathogenic mechanisms of insulin resistance and AD likely overlap. Insulin resistance increases neuroinflammation, which promotes both amyloid β-protein deposition and aberrant tau phosphorylation. By increasing production of reactive oxygen species, insulin resistance triggers amyloid β-protein accumulation. Oxidative stress associated with insulin resistance also dysregulates glycogen synthase kinase 3-β (GSK-3β), which leads to increased tau phosphorylation. Both insulin and amyloid β-protein are metabolized by insulin degrading enzyme (IDE). Defects in this enzyme are the basis for a strong association between T2DM and AD. This review highlights multiple pathogenic mechanisms induced by insulin resistance that are implicated in AD. Several pharmacologic approaches to AD associated with insulin resistance are presented.
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Affiliation(s)
- Zenghui Wei
- Department of Pharmaceutical Sciences, St. John's University, New York, NY, United States
| | - Jagadish Koya
- Department of Pharmaceutical Sciences, St. John's University, New York, NY, United States
| | - Sandra E Reznik
- Department of Pharmaceutical Sciences, St. John's University, New York, NY, United States.,Department of Pathology, Albert Einstein College of Medicine, New York, NY, United States.,Department of Obstetrics and Gynecology and Women's Health, Albert Einstein College of Medicine, New York, NY, United States
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Lee TH, Christie BR, Lin K, Siu PMF, Zhang L, Yuan TF, Komal P, Xu A, So KF, Yau SY. Chronic AdipoRon Treatment Mimics the Effects of Physical Exercise on Restoring Hippocampal Neuroplasticity in Diabetic Mice. Mol Neurobiol 2021; 58:4666-4681. [PMID: 34164760 PMCID: PMC8487422 DOI: 10.1007/s12035-021-02441-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 05/25/2021] [Indexed: 02/07/2023]
Abstract
Administration of exercise mimetic drugs could be a novel therapeutic approach to combat comorbid neurodegeneration and metabolic syndromes. Adiponectin is an adipocyte-secreted hormone. In addition to its antidiabetic effect, adiponectin mediates the antidepressant effect of physical exercise associated with adult hippocampal neurogenesis. The antidiabetic effect of the adiponectin receptor agonist AdipoRon has been demonstrated, but its potential pro-cognitive and neurotrophic effects in the hippocampus under diabetic condition are still unclear. This study reported that chronic AdipoRon treatment for 2 weeks improved hippocampal-dependent spatial recognition memory in streptozotocin-induced diabetic mice. Besides, AdipoRon treatment increased progenitor cell proliferation and neuronal differentiation in the hippocampal dentate gyrus (DG) of diabetic mice. Furthermore, AdipoRon treatment significantly increased dendritic complexity, spine density, and N-methyl-D-aspartate receptor-dependent long-term potentiation (LTP) in the dentate region, and increased BDNF levels in the DG of diabetic mice. AdipoRon treatment activated AMPK/PGC-1α signalling in the DG, whereas increases in cell proliferation and LTP were not observed when PGC-1α signalling was pharmacologically inhibited. In sum, chronic AdipoRon treatment partially mimics the benefits of physical exercise for learning and memory and hippocampal neuroplasticity in the diabetic brain. The results suggested that AdipoRon could be a potential physical exercise mimetic to improve hippocampal plasticity and hence rescue learning and memory impairment typically associated with diabetes.
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Affiliation(s)
- Thomas H Lee
- Department of Rehabilitation Sciences, Faculty of Health and Social Sciences, The Hong Kong Polytechnic University, 11 Yuk Choi Road, Hung Hom, Hong Kong SAR
| | - Brian R Christie
- Division of Medical Sciences, University of Victoria, Victoria, British Columbia, Canada
| | - Kangguang Lin
- Department of Affective Disorder, Guangzhou Brain Hospital, The Affiliated Brain Hospital of Guangzhou Medical University, Guangzhou, China
| | - Parco Ming-Fai Siu
- School of Public Health, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR
| | - Li Zhang
- Key Laboratory of CNS Regeneration (Ministry of Education), Guangdong-Hong Kong-Macau Institute of CNS Regeneration, Jinan University, Guangzhou, China
| | - Ti-Fei Yuan
- Shanghai Mental Health Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Pragya Komal
- Department of Biological Sciences, Birla Institute of Technology and Sciences (BITS-Pilani Hyderabad), Hyderabad, India
| | - Aimin Xu
- Department of Pharmacology and Pharmacy, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR
- State Key Laboratory of Pharmaceutical Biotechnology, The University of Hong Kong, Pokfulam, Hong Kong SAR
| | - Kwok-Fai So
- Key Laboratory of CNS Regeneration (Ministry of Education), Guangdong-Hong Kong-Macau Institute of CNS Regeneration, Jinan University, Guangzhou, China
- State Key Laboratory of Brain and Cognitive Science, The University of Hong Kong, Pokfulam, Hong Kong SAR
| | - Suk-Yu Yau
- Department of Rehabilitation Sciences, Faculty of Health and Social Sciences, The Hong Kong Polytechnic University, 11 Yuk Choi Road, Hung Hom, Hong Kong SAR.
- University Research Facility in Behavioral and Systems Neuroscience, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR.
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Mohamed HE, Asker ME, Shaheen MA, Eissa RG, Younis NN. Alleviation of fructose-induced Alzheimer's disease in rats by pioglitazone and decaffeinated green coffee bean extract. J Food Biochem 2021; 45:e13715. [PMID: 33782984 DOI: 10.1111/jfbc.13715] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 02/13/2021] [Accepted: 03/18/2021] [Indexed: 11/28/2022]
Abstract
Increased fructose consumption is among bad nutritional habits that contribute to increased incidence of neurodegenerative diseases. We proposed that coffee, the most popular beverage worldwide, may protect against the progression of Alzheimer's disease (AD). We investigated the protective potential of decaffeinated green coffee bean extract (GCBE) and the possible potentiation of pioglitazone (PIO) effects by decaffeinated GCBE in fructose-induced AD in rats. Twenty-four rats [12-untreated and 12-pre-treated (for 4 weeks) with GCBE] consumed drinking water supplemented with 10% fructose for 18 weeks. Twelve of these rats (6-GCBE-untreated and 6-GCBE-pre-treated) were treated orally with PIO starting on the 13th week for 6 weeks. Prophylactic administration of GCBE attenuated oxidative damage (increased cortical reduced glutathione and superoxide dismutase activity), while decreased malondialdehyde. It retarded the activation of acetylcholine esterase, increased acetylcholine level in the cortex of fructose-induced AD. It also impeded the upregulation of beta-secretase-1and the accumulation of Aβ plaques that were induced by fructose drinking. With PIO therapy, GCBE showed better effects alleviating oxidative stress and Aβ extracellular plaques formation, while improving cholinergic activity, learning, and memory ability. In conclusions, the consumption of GCBE may protect against the development of AD and delay the progression of AD when given with PIO. PRACTICAL APPLICATIONS: Decaffeinated dietary supplement of green coffee bean extract attenuated the deleterious consequences of fructose-induced Alzheimer's disease in rats. It improved the antioxidant status and cortical cholinergic activity, while hindered the changes responsible for amyloid plaque formation. It also improved the impaired learning and memory. These results, if confirmed by clinical studies, may recommend the consumption of decaffeinated green coffee beans extract as dietary supplement or as a regular beverage to protect against AD in individuals with family history or early signs of AD. With pioglitazone, such dietary supplement improved pioglitazone efficacy and delayed the progression of AD.
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Affiliation(s)
- Hoda E Mohamed
- Department of Biochemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Mervat E Asker
- Department of Biochemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Mohamed A Shaheen
- Department of Histology and Cell Biology, Faculty of Human Medicine, Zagazig University, Zagazig, Egypt
| | - Rana G Eissa
- Department of Biochemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Nahla N Younis
- Department of Biochemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
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10
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Tyagi A, Pugazhenthi S. Targeting Insulin Resistance to Treat Cognitive Dysfunction. Mol Neurobiol 2021; 58:2672-2691. [PMID: 33483903 DOI: 10.1007/s12035-021-02283-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 01/05/2021] [Indexed: 02/06/2023]
Abstract
Dementia is a devastating disease associated with aging. Alzheimer's disease is the most common form of dementia, followed by vascular dementia. In addition to clinically diagnosed dementia, cognitive dysfunction has been reported in diabetic patients. Recent studies are now beginning to recognize type 2 diabetes mellitus, characterized by chronic hyperglycemia and insulin resistance, as a risk factor for Alzheimer's disease and other cognitive disorders. While studies on insulin action have remained traditionally in the domain of peripheral tissues, the detrimental effects of insulin resistance in the central nervous system on cognitive dysfunction are increasingly being reported by recent clinical and preclinical studies. The findings from these studies suggest that antidiabetic drugs have the potential to be used to treat dementia. In this review, we discuss the physiological functions of insulin in the brain, studies on the evaluation of cognitive function under conditions of insulin resistance, and reports on the beneficial actions of antidiabetic drugs in the brain. This review covers clinical studies as well as investigations in animal models and will further highlight the emerging link between insulin resistance and neurodegenerative disorders.
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Affiliation(s)
- Anit Tyagi
- Rocky Mountain Regional VA Medical Center, Aurora, CO, USA.,Department of Medicine, University of Colorado-Anschutz Medical Campus, Aurora, CO, USA.,University of Denver, Denver, CO, USA
| | - Subbiah Pugazhenthi
- Rocky Mountain Regional VA Medical Center, Aurora, CO, USA. .,Department of Medicine, University of Colorado-Anschutz Medical Campus, Aurora, CO, USA.
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11
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Yin Q, Chen J, Ma S, Dong C, Zhang Y, Hou X, Li S, Liu B. Pharmacological Inhibition of Galectin-3 Ameliorates Diabetes-Associated Cognitive Impairment, Oxidative Stress and Neuroinflammation in vivo and in vitro. J Inflamm Res 2020; 13:533-542. [PMID: 32982368 PMCID: PMC7508034 DOI: 10.2147/jir.s273858] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 09/01/2020] [Indexed: 12/15/2022] Open
Abstract
Background In diabetes, cognitive impairment is linked with oxidative stress and neuroinflammation. As the only chimeric member of the galectin family, galectin-3 (Gal3) induces neuroinflammation and cognitive impairment in models of Alzheimer’s disease (AD); however, its role in diabetes-associated cognitive impairment is not established. Methodology Here, we investigated the effects of Gal3 inhibition on cognitive impairment and the possible underlying molecular events in diabetes. We investigated the effects of the Gal3 inhibitor modified citrus pectin (MCP; 100 mg/kg/day oral for 6 weeks) in vivo in high-fat diet (HFD)/streptozotocin (STZ)-induced diabetic rats. Additionally, the effects of MCP on high glucose (HG)-stimulated BV-2 microglial cells were investigated in vitro. Results We found that MCP attenuated memory impairment in diabetic rats in the Morris water maze test and reduced insulin resistance, oxidative stress, and neuroinflammation. In HG-stimulated BV-2 microglial cells, MCP increased cell viability and decreased oxidative stress and the production of proinflammatory cytokines. Conclusion The results of this study indicate that the inhibition of Gal3 by MCP ameliorates diabetes-associated cognitive impairment, oxidative stress, and neuroinflammation, suggesting that Gal3 could be a potential new target for therapeutic intervention to prevent cognitive impairment in diabetes.
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Affiliation(s)
- Qingqing Yin
- Department of Geriatric Neurology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, People's Republic of China.,School of Medicine, Shandong University, Jinan 250021, People's Republic of China.,Department of Geriatrics, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, People's Republic of China
| | - Jian Chen
- Department of Geriatric Neurology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, People's Republic of China
| | - Shizhan Ma
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, People's Republic of China
| | - Chuanfang Dong
- Department of Geriatrics, Jinan Hospital, Jinan, Shandong 250013, People's Republic of China
| | - Yue Zhang
- School of Medicine, Shandong University, Jinan 250021, People's Republic of China.,Department of Geriatrics, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, People's Republic of China
| | - Xunyao Hou
- Department of Geriatric Neurology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, People's Republic of China
| | - Shangbin Li
- Department of Geriatric Neurology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, People's Republic of China.,Department of Geriatrics, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, People's Republic of China
| | - Bin Liu
- Department of Neurology, The First Affiliated Hospital of Shandong First Medical University, Jinan 250014, People's Republic of China.,Department of Neurology, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan 250014, People's Republic of China
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12
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Mandal SP, Reji A, Bhavimani G, Prabitha P, Durai P, Yuvaraj S, Shashank A, Krishna KL, Kumar BRP. Rational Design, Synthesis and Evaluation of Novel Rodanine Derivatives for Antihyperglycemic Activity. Polycycl Aromat Compd 2020. [DOI: 10.1080/10406638.2020.1808795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Subhankar P. Mandal
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru, Karnataka, India
| | - Anu Reji
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru, Karnataka, India
| | - Guru Bhavimani
- Department of Pharmacology, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru, Karnataka, India
| | - P. Prabitha
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru, Karnataka, India
| | - Priya Durai
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru, Karnataka, India
| | - S. Yuvaraj
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru, Karnataka, India
| | - A. Shashank
- Department of Pharmacology, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru, Karnataka, India
| | - K. L. Krishna
- Department of Pharmacology, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru, Karnataka, India
| | - B. R. Prashantha Kumar
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru, Karnataka, India
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Ghibu S, Craciun CE, Rusu R, Morgovan C, Mogosan C, Rochette L, Gal AF, Dronca M. Impact of Alpha-Lipoic Acid Chronic Discontinuous Treatment in Cardiometabolic Disorders and Oxidative Stress Induced by Fructose Intake in Rats. Antioxidants (Basel) 2019; 8:antiox8120636. [PMID: 31835800 PMCID: PMC6943500 DOI: 10.3390/antiox8120636] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 11/28/2019] [Accepted: 12/09/2019] [Indexed: 12/24/2022] Open
Abstract
Insulin resistance (IR) and cardiometabolic disorders are the main consequences of today’s alimentary behavior. This study evaluates the effects of a chronic-discontinuous treatment with alpha-lipoic acid (AL), an antioxidant substance that improves glycemic control associated with diabetes mellitus, on metabolic disorders and plasma oxidative stress induced by fructose intake, in rats. Sprague-Dawley rats (48 animals) were randomized into two series (n = 24): rats fed with standard chow or with standard chow supplemented with 60% fructose. In each of the two series, for 2 weeks/month over 12 weeks, a group of rats (n = 12) was intraperitoneally injected with NaCl 0.9%, and a second group (n = 12) received AL 50 mg/kg/day. Body weight, glycemia, and systolic blood pressure were monitored throughout the study. After 12 weeks, IR, plasma lipoproteins, uric acid, transaminase activities, and oxidative stress markers were assessed. The high fructose-enriched diet induced cardiometabolic disorders (hypertension, hyperglycemia, IR and dyslipidemia), an increase in uric acid concentration, transaminase activities and C-reactive protein level. This diet also enhanced plasma products of lipid and protein oxidation, homocysteine level, and decreased GSH/GSSG ratio. In this field, there is evidence to indicate that oxidative stress plays an important role in the etiology of diabetic complications. AL discontinuous treatment prevents the metabolic disorders induced by fructose intake, reduced plasma lipid and protein oxidation-products, and restored the GHS/GSSG ratio. Our study proves a promising potential of the chronic-discontinuous treatment of AL and highlights the pleiotropic effects of this antioxidant substance in metabolic disorders such as diabetes.
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Affiliation(s)
- Steliana Ghibu
- Department of Pharmacology, Physiology and Pathophysiology, Faculty of Pharmacy, “Iuliu Haţieganu” University of Medicine and Pharmacy, 400349 Cluj-Napoca, Romania;
| | - Cristina Elena Craciun
- Department of Pharmaceutical Biochemistry and Clinical Laboratory, Faculty of Pharmacy, “Iuliu Haţieganu” University of Medicine and Pharmacy, 400349 Cluj-Napoca, Romania;
| | - Razvan Rusu
- Department of Medical Biochemistry, Faculty of Medicine, “Iuliu Haţieganu” University of Medicine and Pharmacy, 400349 Cluj-Napoca, Romania; (R.R.); (M.D.)
| | - Claudiu Morgovan
- Preclinical Department, “Lucian Blaga” University of Sibiu, 550169 Sibiu, Romania;
| | - Cristina Mogosan
- Department of Pharmacology, Physiology and Pathophysiology, Faculty of Pharmacy, “Iuliu Haţieganu” University of Medicine and Pharmacy, 400349 Cluj-Napoca, Romania;
- Correspondence: or (C.M.); (L.R.)
| | - Luc Rochette
- Equipe d’Accueil (EA 7460), Physiopathologie et Epidémiologie Cérébro-Cardiovasculaires (PEC2), Université de Bourgogne - Franche Comté, Faculté des Sciences de Santé, 7 Bd Jeanne d’Arc, 21000 Dijon, France
- Correspondence: or (C.M.); (L.R.)
| | - Adrian Florin Gal
- Department of Cell Biology, Histology and Embryology, Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine, 400372 Cluj-Napoca, Romania;
| | - Maria Dronca
- Department of Medical Biochemistry, Faculty of Medicine, “Iuliu Haţieganu” University of Medicine and Pharmacy, 400349 Cluj-Napoca, Romania; (R.R.); (M.D.)
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14
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Beheshti F, Hosseini M, Hashemzehi M, Soukhtanloo M, Asghari A. The effects of PPAR-γ agonist pioglitazone on anxiety and depression-like behaviors in lipopolysaccharide injected rats. TOXIN REV 2019. [DOI: 10.1080/15569543.2019.1673425] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Farimah Beheshti
- Neuroscience Research Center, Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran
- Department of Physiology, School of Paramedical Sciences, Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran
| | - Mahmoud Hosseini
- Division of Neurocognitive Sciences, Psychiatry and Behavioral Sciences Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
- Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Milad Hashemzehi
- Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
- Department of Physiology, Iranshahr University of Medical Sciences, Iranshahr, Iran
| | - Mohammad Soukhtanloo
- Department of Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Amir Asghari
- Department of Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
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15
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Ohyagi Y, Miyoshi K, Nakamura N. Therapeutic Strategies for Alzheimer's Disease in the View of Diabetes Mellitus. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1128:227-248. [PMID: 31062332 DOI: 10.1007/978-981-13-3540-2_11] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Recently, Alzheimer's disease (AD) is understood as "diabetes of the brain" or "type 3 diabetes." Recent clinical trials of anti-amyloid β-protein (Aβ) therapies have not proved to be successful. Thus, glucose-insulin metabolism in the brain is thought to be an alternative therapeutic target. Various types of antidiabetic drugs such as insulin, thiazolidinediones, dipeptidyl peptidase-4 (DPP4) inhibitors, glucagon-like peptide-1 (GLP-1) agonists, biguanides, and others have been reported to be effective on cognitive impairment in animal models and patients with DM or AD. Here, recent reports are reviewed. While we identified apomorphine (APO) as a novel drug that promoted intracellular Aβ degradation and improved memory function in an AD mouse model, more recently, we have revealed that APO treatment improves neuronal insulin resistance and activates insulin-degrading enzyme (IDE), a major Aβ-degrading enzyme. In this context, recovery of impaired insulin signaling in AD neurons may be a promising therapeutic strategy for AD dementia.
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Affiliation(s)
- Yasumasa Ohyagi
- Department of Neurology and Geriatric Medicine, Graduate School of Medicine, Ehime University, Toon, Ehime, Japan.
| | - Katsue Miyoshi
- Long-Term Care Health Facility Cosmos, Kushiro-mutsumi, Hokkaido, Japan
| | - Norimichi Nakamura
- Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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16
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Kodumuri PK, Thomas C, Jetti R, Pandey AK. Fenugreek seed extract ameliorates cognitive deficits in streptozotocin-induced diabetic rats. J Basic Clin Physiol Pharmacol 2019; 30:jbcpp-2018-0140. [PMID: 31326961 DOI: 10.1515/jbcpp-2018-0140] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Accepted: 02/25/2019] [Indexed: 02/06/2023]
Abstract
Background Natural medicinal plants have been the focus of current research for developing neuroprotective agents to be used in the diabetes-linked cognitive dysfunction. Trigonella foenum-graecum seeds (known as fenugreek, methi in Hindi), is a well-known traditional medicinal herb and possesses anti-diabetic, anti-oxidant, and anti-inflammatory properties. Purpose This study was undertaken to explore the ameliorative effects of T. foenum-graecum seed extract on diabetes-induced cognitive dysfunction. Methods Experimental diabetes was induced by administering a single dose of streptozotocin (60 mg/kg) through intraperitoneal dose. Cognitive function was assessed using a T-maze and the Morris water maze. Lipid peroxidation levels and oxidative stress in the hippocampus was measured. Quantification of hippocampal CA1 and CA3 regions was done using cresyl violet stain. Results Diabetic rats demonstrated learning and memory impairment, which was evident from poor performance in behavioral tasks, i.e. T-maze and Morris water maze tasks. Learning and memory impairment in diabetic animals is associated with increased blood glucose levels, increased oxidative stress in the hippocampus and decreased number of neurons in the CA1 and CA3 regions of the hippocampus. The diabetic rats administered with T. foenum-graecum showed improved performance in behavioral tasks, and these changes were associated with decreased blood glucose levels, decreased oxidative stress in the hippocampus, and decreased neuronal loss from the CA1 and CA3 regions of the hippocampus. Conclusion In conclusion, administration of T. foenum-graecum seed extract ameliorates diabetes-linked cognitive dysfunction in rats by decreasing blood glucose levels, reducing lipid peroxidation and oxidative stress in the hippocampus, and preventing neuronal loss from the hippocampus.
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Affiliation(s)
- Praveen K Kodumuri
- Tomo Riba Institute of Health and Medical Sciences, Physiology, Old Assembly Complex,Naharlagun, India.,Department of Physiology, Varun Arjun Medical College and Rohilkand Hospital, Banthra, Shahjahanpur (Uttar Pradesh), India
| | - Christofer Thomas
- Department of Physiology, Sapthagiri Institute of Medical Science and Research Center, Bangalore, India
| | - Raghu Jetti
- Department of Basic Medical Sciences, College of Applied Medical Sciences, King Khalid University, Abha, Kingdom of Saudi Arabia
| | - Anil Kumar Pandey
- ESIC Medical College, Physiology, Faridabad, India.,Department of Physiology, ESIC Medical College and Hospital, Faridabad, Haryana, India, Phone: + 91-7042918222
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17
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Jojo GM, Kuppusamy G, Selvaraj K, Baruah UK. Prospective of managing impaired brain insulin signalling in late onset Alzheimers disease with excisting diabetic drugs. J Diabetes Metab Disord 2019; 18:229-242. [PMID: 31275894 DOI: 10.1007/s40200-019-00405-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Accepted: 04/12/2019] [Indexed: 12/25/2022]
Abstract
Late onset Alzheimer's disease (AD) is the most common cause of dementia among elderly. The exact cause of the disease is until now unknown and there is no complete cure for the disease. Growing evidence suggest that AD is a metabolic disorder associated with impairment in brain insulin signalling. These findings enriched the scope for the repurposing of diabetic drugs in AD management. Even though many of these drugs are moving in a positive direction in the ongoing clinical studies, the extent of the success has seen to influence by several properties of these drugs since they were originally designed to manage the peripheral insulin resistance. In depth understandings of these properties is hence highly significant to optimise the use of diabetic drugs in the clinical management of AD; which is the primary aim of the present review article.
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Affiliation(s)
- Gifty M Jojo
- Department of Pharmaceutics, JSS College of pharmacy, Ootacamund, JSS Academy of Higher Education & Research, Mysore, India
| | - Gowthamarajan Kuppusamy
- Department of Pharmaceutics, JSS College of pharmacy, Ootacamund, JSS Academy of Higher Education & Research, Mysore, India
| | - Kousalya Selvaraj
- Department of Pharmaceutics, JSS College of pharmacy, Ootacamund, JSS Academy of Higher Education & Research, Mysore, India
| | - Uday Krishna Baruah
- Department of Pharmaceutics, JSS College of pharmacy, Ootacamund, JSS Academy of Higher Education & Research, Mysore, India
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18
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Jojo GM, Kuppusamy G, De A, Karri VVSNR. Formulation and optimization of intranasal nanolipid carriers of pioglitazone for the repurposing in Alzheimer's disease using Box-Behnken design. Drug Dev Ind Pharm 2019; 45:1061-1072. [PMID: 30922126 DOI: 10.1080/03639045.2019.1593439] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Growing evidence suggest that Alzheimer's disease (AD), the most common cause of dementia among the elderly is a metabolic disorder associated with impaired brain insulin signaling. Hence, the diabetic drug can be a therapeutic option for the management AD. The researches in this area are ongoing and Pioglitazone (PIO) is one of the most investigated diabetic drug in AD. Eventhough PIO treatment was found to improve AD significantly in the preclinical models, the poor blood-brain barrier (BBB) permeability and serious peripheral side effects limited its success in the clinical trials. The objective of the present study was to formulate and optimize intranasal (IN) nano lipid carriers (NLC) of PIO for its targeted delivery to the brain. A Box-Behnken design was employed to optimize the effect of three independent variables on two dependent variables. The optimized formulation had a particle size (PS) of 211.4 ± 3.54 nm and zeta potential of (ZP) of 14.9 ± 1.09 mv. The polydispersibility index (PDI) and entrapment efficiency (EE) was found to be 0.257 ± 0.108 and 70.18 ± 4.5% respectively. Storage stability studies performed has confirmed the stability of NLCs at 4 °C and 25 °C. The in-vitro drug release study has exhibited a sustained release of drug from the NLC. The formulation was observed to improve the nasal permeability of PIO ex-vivo significantly. Toxicity studies were performed to confirm the safety of formulation for the in-vivo administration. In-vivo biodistribution study in rats has shown a direct transport of drug from the nose to brain from the IN-NLC.
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Affiliation(s)
- Gifty M Jojo
- a Department of Pharmaceutics, JSS College of Pharmacy , Ootacamund, JSS Academy of Higher Education and Research , Mysuru , India
| | - Gowthamarajan Kuppusamy
- a Department of Pharmaceutics, JSS College of Pharmacy , Ootacamund, JSS Academy of Higher Education and Research , Mysuru , India
| | - Anindita De
- a Department of Pharmaceutics, JSS College of Pharmacy , Ootacamund, JSS Academy of Higher Education and Research , Mysuru , India
| | - V V S Narayan Reddy Karri
- a Department of Pharmaceutics, JSS College of Pharmacy , Ootacamund, JSS Academy of Higher Education and Research , Mysuru , India
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19
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Cortez I, Denner L, Dineley KT. Divergent Mechanisms for PPARγ Agonism in Ameliorating Aging-Related Versus Cranial Irradiation-Induced Context Discrimination Deficits. Front Aging Neurosci 2019; 11:38. [PMID: 30930764 PMCID: PMC6427093 DOI: 10.3389/fnagi.2019.00038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 02/07/2019] [Indexed: 11/13/2022] Open
Abstract
A major aspect of mammalian aging is the decline in functional competence of many self-renewing cell types, including adult-born neuronal precursors in a process termed neurogenesis. Adult neurogenesis is limited to specific brain regions in the mammalian brain, such as the subgranular zone (SGZ) of the hippocampus. Alterations in adult neurogenesis appear to be a common hallmark in different neurodegenerative diseases including Alzheimer’s disease (AD). We and others have shown that PPARγ agonism improves cognition in preclinical models of AD as well as in several pilot clinical trials. Context discrimination is recognized as a cognitive task supported by proliferation and differentiation of adult-born neurons in the dentate gyrus of the hippocampus that we and others have previously shown declines with age. We therefore postulated that PPARγ agonism would positively impact context discrimination in middle-aged mice via mechanisms that influence proliferation and differentiation of adult-born neurons arising from the SGZ. To achieve our objective, 8-months old mice were left untreated or treated with the FDA-approved PPARγ agonist, rosiglitazone then tested for context discrimination learning and memory, followed by immunofluorescence evaluation of hippocampal SGZ cell proliferation and neuron survival. We found that PPARγ agonism enhanced context discrimination performance in middle-aged mice concomitant with stimulated SGZ cell proliferation, but not new neuron survival. Focal cranial irradiation that destroys neurogenesis severely compromised context discrimination in middle-aged mice yet rosiglitazone treatment significantly improved cognitive performance through an anti-inflammatory mechanism and resurrection of the neurogenic niche. Thus, we have evidence for divergent mechanisms by which PPARγ agonism impinges upon aging-related versus cranial irradiation-induced deficits in context discrimination learning and memory.
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Affiliation(s)
- Ibdanelo Cortez
- Department of Neurology, The University of Texas Medical Branch at Galveston, Galveston, TX, United States
| | - Larry Denner
- Department of Neurology, The University of Texas Medical Branch at Galveston, Galveston, TX, United States.,Department of Internal Medicine, The University of Texas Medical Branch at Galveston, Galveston, TX, United States
| | - Kelly T Dineley
- Department of Neurology, The University of Texas Medical Branch at Galveston, Galveston, TX, United States
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20
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Jojo GM, Kuppusamy G. Scope of new formulation approaches in the repurposing of pioglitazone for the management of Alzheimer’s disease. J Clin Pharm Ther 2019; 44:337-348. [DOI: 10.1111/jcpt.12808] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 12/28/2018] [Accepted: 01/08/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Gifty M. Jojo
- Department of Pharmaceutics JSS College of Pharmacy Ootacamund India
- JSS Academy of Higher Education and Research Mysuru India
| | - Gowthamarajan Kuppusamy
- Department of Pharmaceutics JSS College of Pharmacy Ootacamund India
- JSS Academy of Higher Education and Research Mysuru India
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21
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Fawzy Fahim V, Wadie W, Shafik AN, Ishak Attallah M. Role of simvastatin and insulin in memory protection in a rat model of diabetes mellitus and dementia. Brain Res Bull 2019; 144:21-27. [DOI: 10.1016/j.brainresbull.2018.10.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 10/21/2018] [Accepted: 10/31/2018] [Indexed: 02/06/2023]
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22
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Silva-Abreu M, Calpena AC, Andrés-Benito P, Aso E, Romero IA, Roig-Carles D, Gromnicova R, Espina M, Ferrer I, García ML, Male D. PPARγ agonist-loaded PLGA-PEG nanocarriers as a potential treatment for Alzheimer's disease: in vitro and in vivo studies. Int J Nanomedicine 2018; 13:5577-5590. [PMID: 30271148 PMCID: PMC6154713 DOI: 10.2147/ijn.s171490] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
OBJECTIVE The first aim of this study was to develop a nanocarrier that could transport the peroxisome proliferator-activated receptor agonist, pioglitazone (PGZ) across brain endothelium and examine the mechanism of nanoparticle transcytosis. The second aim was to determine whether these nanocarriers could successfully treat a mouse model of Alzheimer's disease (AD). METHODS PGZ-loaded nanoparticles (PGZ-NPs) were synthesized by the solvent displacement technique, following a factorial design using poly (lactic-co-glycolic acid) polyethylene glycol (PLGA-PEG). The transport of the carriers was assessed in vitro, using a human brain endothelial cell line, cytotoxicity assays, fluorescence-tagged nanocarriers, fluorescence-activated cell sorting, confocal and transmission electron microscopy. The effectiveness of the treatment was assessed in APP/PS1 mice in a behavioral assay and by measuring the cortical deposition of β-amyloid. RESULTS Incorporation of PGZ into the carriers promoted a 50x greater uptake into brain endothelium compared with the free drug and the carriers showed a delayed release profile of PGZ in vitro. In the doses used, the nanocarriers were not toxic for the endothelial cells, nor did they alter the permeability of the blood-brain barrier model. Electron microscopy indicated that the nanocarriers were transported from the apical to the basal surface of the endothelium by vesicular transcytosis. An efficacy test carried out in APP/PS1 transgenic mice showed a reduction of memory deficit in mice chronically treated with PGZ-NPs. Deposition of β-amyloid in the cerebral cortex, measured by immunohistochemistry and image analysis, was correspondingly reduced. CONCLUSION PLGA-PEG nanocarriers cross brain endothelium by transcytosis and can be loaded with a pharmaceutical agent to effectively treat a mouse model of AD.
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Affiliation(s)
- Marcelle Silva-Abreu
- Department of Pharmacy, Pharmaceutical Technology and Physical Chemistry, Faculty of Pharmacy and Food Sciences, University of Barcelona, Barcelona, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, Barcelona, Spain
| | - Ana Cristina Calpena
- Department of Pharmacy, Pharmaceutical Technology and Physical Chemistry, Faculty of Pharmacy and Food Sciences, University of Barcelona, Barcelona, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, Barcelona, Spain
| | - Pol Andrés-Benito
- Servei d'Anatomia Patològica, Institut d'Investigació Biomèdica de Bellvitge-Hospital Universitari de Bellvitge, Universitat de Barcelona, L'Hospitalet de Llobregat, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Instituto de Salud Carlos III, Madrid, Spain
| | - Ester Aso
- Servei d'Anatomia Patològica, Institut d'Investigació Biomèdica de Bellvitge-Hospital Universitari de Bellvitge, Universitat de Barcelona, L'Hospitalet de Llobregat, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Instituto de Salud Carlos III, Madrid, Spain
| | - Ignacio A Romero
- School of Life, Health and Chemical Sciences, Faculty of Science, The Open University, Walton Hall, Milton Keynes, UK,
| | - David Roig-Carles
- School of Life, Health and Chemical Sciences, Faculty of Science, The Open University, Walton Hall, Milton Keynes, UK,
| | - Radka Gromnicova
- School of Life, Health and Chemical Sciences, Faculty of Science, The Open University, Walton Hall, Milton Keynes, UK,
| | - Marta Espina
- Department of Pharmacy, Pharmaceutical Technology and Physical Chemistry, Faculty of Pharmacy and Food Sciences, University of Barcelona, Barcelona, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, Barcelona, Spain
| | - Isidre Ferrer
- Servei d'Anatomia Patològica, Institut d'Investigació Biomèdica de Bellvitge-Hospital Universitari de Bellvitge, Universitat de Barcelona, L'Hospitalet de Llobregat, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Instituto de Salud Carlos III, Madrid, Spain
| | - María Luisa García
- Department of Pharmacy, Pharmaceutical Technology and Physical Chemistry, Faculty of Pharmacy and Food Sciences, University of Barcelona, Barcelona, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, Barcelona, Spain
| | - David Male
- School of Life, Health and Chemical Sciences, Faculty of Science, The Open University, Walton Hall, Milton Keynes, UK,
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23
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Enhancement of cognitive functions by rice bran extract in a neuroinflammatory mouse model via regulation of PPARγ. J Funct Foods 2018. [DOI: 10.1016/j.jff.2018.07.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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Lee JH, Jahrling JB, Denner L, Dineley KT. Targeting Insulin for Alzheimer’s Disease: Mechanisms, Status and Potential Directions. J Alzheimers Dis 2018; 64:S427-S453. [DOI: 10.3233/jad-179923] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Jung Hyun Lee
- Department of Neurology, University of Texas Medical Branch, Galveston, TX, USA
| | - Jordan B. Jahrling
- Department of Neurology, University of Texas Medical Branch, Galveston, TX, USA
| | - Larry Denner
- Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX, USA
| | - Kelly T. Dineley
- Department of Neurology, University of Texas Medical Branch, Galveston, TX, USA
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25
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Garaschuk O, Semchyshyn HM, Lushchak VI. Healthy brain aging: Interplay between reactive species, inflammation and energy supply. Ageing Res Rev 2018; 43:26-45. [PMID: 29452266 DOI: 10.1016/j.arr.2018.02.003] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 11/13/2017] [Accepted: 02/08/2018] [Indexed: 02/07/2023]
Abstract
Brains' high energy expenditure with preferable utilization of glucose and ketone bodies, defines the specific features of its energy homeostasis. The extensive oxidative metabolism is accompanied by a concomitant generation of high amounts of reactive oxygen, nitrogen, and carbonyl species, which will be here collectively referred to as RONCS. Such metabolism in combination with high content of polyunsaturated fatty acids creates specific problems in maintaining brains' redox homeostasis. While the levels of products of interaction between RONCS and cellular components increase slowly during the first two trimesters of individuals' life, their increase is substantially accelerated towards the end of life. Here we review the main mechanisms controlling the redox homeostasis of the mammalian brain, their age-dependencies as well as their adaptive potential, which might turn out to be much higher than initially assumed. According to recent data, the organism seems to respond to the enhancement of aging-related toxicity by forming a new homeostatic set point. Therefore, further research will focus on understanding the properties of the new set point(s), the general nature of this phenomenon and will explore the limits of brains' adaptivity.
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Affiliation(s)
- O Garaschuk
- Department of Neurophysiology, Institute of Physiology, University of Tübingen, 72074 Tübingen, Germany.
| | - H M Semchyshyn
- Department of Biochemistry and Biotechnology, Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Str, Ivano-Frankivsk, 76018, Ukraine.
| | - V I Lushchak
- Department of Biochemistry and Biotechnology, Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Str, Ivano-Frankivsk, 76018, Ukraine.
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26
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Mohamed HE, Asker ME, Younis NN, Shaheen MA, Eissa RG. Modulation of brain insulin signaling in Alzheimer’s disease: New insight on the protective role of green coffee bean extract. Nutr Neurosci 2018; 23:27-36. [DOI: 10.1080/1028415x.2018.1468535] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Hoda E. Mohamed
- Department of Biochemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Mervat E. Asker
- Department of Biochemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Nahla N. Younis
- Department of Biochemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Mohamed A. Shaheen
- Department of Histology and Cell Biology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Rana G. Eissa
- Department of Biochemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
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Sangüesa G, Cascales M, Griñán C, Sánchez RM, Roglans N, Pallàs M, Laguna JC, Alegret M. Impairment of Novel Object Recognition Memory and Brain Insulin Signaling in Fructose- but Not Glucose-Drinking Female Rats. Mol Neurobiol 2018; 55:6984-6999. [DOI: 10.1007/s12035-017-0863-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 12/22/2017] [Indexed: 01/10/2023]
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Al Sharif M, Alov P, Diukendjieva A, Vitcheva V, Simeonova R, Krasteva I, Shkondrov A, Tsakovska I, Pajeva I. Molecular determinants of PPARγ partial agonism and related in silico/in vivo studies of natural saponins as potential type 2 diabetes modulators. Food Chem Toxicol 2017; 112:47-59. [PMID: 29247773 DOI: 10.1016/j.fct.2017.12.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Revised: 12/04/2017] [Accepted: 12/07/2017] [Indexed: 12/29/2022]
Abstract
The metabolic syndrome, which includes hypertension, type 2 diabetes (T2D) and obesity, has reached an epidemic-like scale. Saponins and sapogenins are considered as valuable natural products for ameliorating this pathology, possibly through the nuclear receptor PPARγ activation. The aims of this study were: to look for in vivo antidiabetic effects of a purified saponins' mixture (PSM) from Astragalus corniculatus Bieb; to reveal by in silico methods the molecular determinants of PPARγ partial agonism, and to investigate the potential PPARγ participation in the PSM effects. In the in vivo experiments spontaneously hypertensive rats (SHRs) with induced T2D were treated with PSM or pioglitazone as a referent PPARγ full agonist, and pathology-relevant biochemical markers were analysed. The results provided details on the PSM modulation of the glucose homeostasis and its potential mechanism. The in silico studies focused on analysis of the protein-ligand interactions in crystal structures of human PPARγ-partial agonist complexes, pharmacophore modelling and molecular docking. They outlined key pharmacophoric features, typical for the PPARγ partial agonists, which were used for pharmacophore-based docking of the main PSM sapogenin. The in silico studies, strongly suggest possible involvement of PPARγ-mediated mechanisms in the in vivo antidiabetic and antioxidant effects of PSM from A. corniculatus.
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Affiliation(s)
- Merilin Al Sharif
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 105, 1113 Sofia, Bulgaria.
| | - Petko Alov
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 105, 1113 Sofia, Bulgaria.
| | - Antonia Diukendjieva
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 105, 1113 Sofia, Bulgaria.
| | - Vessela Vitcheva
- Faculty of Pharmacy, Medical University of Sofia, Dunav 2 Str., 1000 Sofia, Bulgaria.
| | - Rumyana Simeonova
- Faculty of Pharmacy, Medical University of Sofia, Dunav 2 Str., 1000 Sofia, Bulgaria.
| | - Ilina Krasteva
- Faculty of Pharmacy, Medical University of Sofia, Dunav 2 Str., 1000 Sofia, Bulgaria.
| | - Aleksandar Shkondrov
- Faculty of Pharmacy, Medical University of Sofia, Dunav 2 Str., 1000 Sofia, Bulgaria.
| | - Ivanka Tsakovska
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 105, 1113 Sofia, Bulgaria.
| | - Ilza Pajeva
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 105, 1113 Sofia, Bulgaria.
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Gutiérrez-Lara EJ, Navarrete-Vázquez G, Sánchez-López A, Centurión D. Pharmacological evaluation of metformin and N-benzylbiguanide, a novel analogue of metformin, on the vasopressor responses to adrenergic system stimulation in pithed rats with fructose-induced insulin resistance. Eur J Pharmacol 2017; 814:313-323. [PMID: 28870455 DOI: 10.1016/j.ejphar.2017.08.044] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 08/24/2017] [Accepted: 08/25/2017] [Indexed: 12/13/2022]
Abstract
Metformin has been associated with cardioprotection, vasorelaxation and normalization of endothelial function during type 2 Diabetes Mellitus. However, few studies have analysed its effects on vascular adrenergic system. Our study has evaluated the vasopressor responses induced by sympathetic stimulation or by i.v. bolus injections of the agonists noradrenaline (α1/2), methoxamine (α1) and UK 14,304 (α2) in rats with fructose-induced insulin resistance chronically pretreated with either metformin or EGL-6M (N-benzylbiguanide), a novel analogue of metformin. Rats were treated with fructose (15%) or tap water (control) during 16 weeks. Next, both groups were treated daily during 4 weeks with: (1) vehicle; (2) metformin (50mg/kg); or (3) EGL-6M (50mg/kg). Blood glucose and plasma insulin were determined before and after administration of glucose during oral glucose tolerance test. Animals treated with fructose showed hyperinsulinemia and insulin resistance, which were decreased by metformin and EGL-6M. In animals treated with fructose, the vasopressor responses induced by: (1) sympathetic stimulation were decreased; (2) noradrenaline were increased; and (3) methoxamine and UK 14,304 remained unaffected compared with control group. In control animals, metformin failed to modify the vasopressor responses analysed, while EGL-6M increased the vasopressor responses to sympathetic stimulation. In rats treated with fructose, metformin decreased vasopressor response to noradrenaline but did not modify the sympathetic stimulation responses. EGL-6M increased the vasopressor responses to sympathetic stimulation without modifying those to noradrenaline, methoxamine or UK 14,304. Collectively, these data suggest that EGL-6M is capable to increase insulin sensitivity and the vasopressor sympathetic outflow in rats.
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Affiliation(s)
- Erika J Gutiérrez-Lara
- Departamento de Farmacobiología, Cinvestav Unidad Coapa, Czda. de los Tenorios 235, Col. Granjas-Coapa, Deleg. Tlalpan, C.P. 14330 México City, Mexico
| | - Gabriel Navarrete-Vázquez
- Facultad de Farmacia, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, C.P. 62209 Cuernavaca Morelos, Mexico
| | - Araceli Sánchez-López
- Departamento de Farmacobiología, Cinvestav Unidad Coapa, Czda. de los Tenorios 235, Col. Granjas-Coapa, Deleg. Tlalpan, C.P. 14330 México City, Mexico
| | - David Centurión
- Departamento de Farmacobiología, Cinvestav Unidad Coapa, Czda. de los Tenorios 235, Col. Granjas-Coapa, Deleg. Tlalpan, C.P. 14330 México City, Mexico.
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de Matos AM, de Macedo MP, Rauter AP. Bridging Type 2 Diabetes and Alzheimer's Disease: Assembling the Puzzle Pieces in the Quest for the Molecules With Therapeutic and Preventive Potential. Med Res Rev 2017; 38:261-324. [PMID: 28422298 DOI: 10.1002/med.21440] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 01/18/2017] [Accepted: 02/14/2017] [Indexed: 12/19/2022]
Abstract
Type 2 diabetes (T2D) and Alzheimer's disease (AD) are two age-related amyloid diseases that affect millions of people worldwide. Broadly supported by epidemiological data, the higher incidence of AD among type 2 diabetic patients led to the recognition of T2D as a tangible risk factor for the development of AD. Indeed, there is now growing evidence on brain structural and functional abnormalities arising from brain insulin resistance and deficiency, ultimately highlighting the need for new approaches capable of preventing the development of AD in type 2 diabetic patients. This review provides an update on overlapping pathophysiological mechanisms and pathways in T2D and AD, such as amyloidogenic events, oxidative stress, endothelial dysfunction, aberrant enzymatic activity, and even shared genetic background. These events will be presented as puzzle pieces put together, thus establishing potential therapeutic targets for drug discovery and development against T2D and diabetes-induced cognitive decline-a heavyweight contributor to the increasing incidence of dementia in developed countries. Hoping to pave the way in this direction, we will present some of the most promising and well-studied drug leads with potential against both pathologies, including their respective bioactivity reports, mechanisms of action, and structure-activity relationships.
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Affiliation(s)
- Ana Marta de Matos
- Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Campo Grande, 1749-016, Lisbon, Portugal.,CEDOC Chronic Diseases, Nova Medical School, Rua Câmara Pestana n 6, 6-A, Ed. CEDOC II, 1150-082, Lisbon, Portugal
| | - Maria Paula de Macedo
- CEDOC Chronic Diseases, Nova Medical School, Rua Câmara Pestana n 6, 6-A, Ed. CEDOC II, 1150-082, Lisbon, Portugal
| | - Amélia Pilar Rauter
- Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Campo Grande, 1749-016, Lisbon, Portugal
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Yang S, Chen Z, Cao M, Li R, Wang Z, Zhang M. Pioglitazone ameliorates Aβ42 deposition in rats with diet-induced insulin resistance associated with AKT/GSK3β activation. Mol Med Rep 2017; 15:2588-2594. [PMID: 28447730 PMCID: PMC5428924 DOI: 10.3892/mmr.2017.6342] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 01/26/2017] [Indexed: 01/22/2023] Open
Abstract
Pioglitazone may have potential benefits as an alternative therapeutic treatment for patients with Alzheimer's disease (AD), particularly in individuals that also have comorbid diabetes; however, the mechanisms of action remain unclear. The present study aimed to explore the effects of pioglitazone on amyloid β, isoform 42 (Aβ42) deposition in rats with diet‑induced insulin resistance (IR). Diet‑induced IR model rats were established in the presence or absence of pioglitazone. Plasma glucose and insulin levels, and cerebrospinal fluid insulin levels were measured; in addition, hippocampal tissues were collected for immunohistochemical analysis of Aβ42 expression. The levels of insulin‑degrading enzyme (IDE) and peroxisome proliferator‑activated receptor γ (PPARγ) mRNA and protein expression were analyzed by reverse transcription‑quantitative polymerase chain reaction and western blotting, respectively. In addition, the activation of glycogen synthase kinase 3β (GSK3β) induced by phosphatidylinositol 3‑kinase (PI3K) /protein kinase B (AKT) signaling was detected by western blotting. Results from the present study demonstrated that pioglitazone may enhance peripheral and brain insulin sensitivity in diet‑induced IR model rats. Treatment with pioglitazone ameliorated Aβ42 deposition in the hippocampus by increasing IDE and PPARγ expression. Notably, activation of the PI3K/AKT/GSK3β pathway was also demonstrated to serve a role in pioglitazone‑induced Aβ42 degradation, which was abrogated by the PPARγ antagonist GW9662. Results from the present study indicated that pioglitazone may improve insulin sensitivity and ameliorate Aβ42 accumulation in rats with diet‑induced IR by regulating AKT/GSK3β activation, suggesting that pioglitazone may be a promising drug for AD treatment.
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Affiliation(s)
- Sisi Yang
- Department of Geriatrics, Tongji Hospital Affiliated to The Tongji Medical College of Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Zhe Chen
- Department of Integrated Chinese Traditional and Western Medicine, Tongji Hospital Affiliated to The Tongji Medical College of Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Ming Cao
- Department of Geriatrics, Tongji Hospital Affiliated to The Tongji Medical College of Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Renjie Li
- Department of Emergency, Tongji Hospital Affiliated to The Tongji Medical College of Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Zhigang Wang
- Department of Pathogen Biology, College of Basic Medicine, Hubei University of Chinese Medicine, Wuhan, Hubei 430065, P.R. China
| | - Muxun Zhang
- Department of Endocrinology, Tongji Hospital Affiliated to The Tongji Medical College of Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
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Mazumder AG, Sharma P, Patial V, Singh D. Crocin Attenuates Kindling Development and Associated Cognitive Impairments in Mice via Inhibiting Reactive Oxygen Species-Mediated NF-κB Activation. Basic Clin Pharmacol Toxicol 2016; 120:426-433. [PMID: 27800651 DOI: 10.1111/bcpt.12694] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 10/18/2016] [Indexed: 12/22/2022]
Abstract
Crocin is a pharmacologically active carotenoid pigment mainly present in the stigmas of Crocus sativus L. (Iridaceae). It has been well explored in experimental animal models of cognitive impairments, depression, anxiety and epilepsy. This study was designed to understand the effect of crocin on pentylenetetrazol (PTZ)-induced kindling development and its associated cognitive deficit in mouse. Crocin treatment at 5, 10 and 20 mg/kg p.o. doses showed a marked reduction in severity of PTZ-induced seizures. There was an increase in novel object preference index and discrimination ratio in the crocin-treated groups in the novel object recognition test. Its treatment also increased percentage spontaneous alternations in T-maze test at all the tested doses. Histopathological examination by Nissl staining showed a reduction in dark neurons in the hippocampal pyramidal layer of crocin-treated animals in contrast to vehicle control, indicating a decrease in neuronal damage. Biochemical estimations showed a significant increase in superoxide dismutase activity and reduced reactive oxygen species (ROS) in the hippocampus of crocin-treated animals. Immunohistochemistry results revealed attenuation in the levels of nuclear factor-κB (NF-κB) and phosphorylated NF-κB in the hippocampal sections of crocin-treated animals. The results of this study concluded that crocin treatment increased seizure threshold, thus inhibiting PTZ-induced kindling development and improving cognitive functions. The effect was found to be due to suppression of seizure-induced ROS generation and its linked NF-κB pathway-associated neuronal damage.
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Affiliation(s)
- Arindam Ghosh Mazumder
- Pharmacology and Toxicology Laboratory, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
| | - Pallavi Sharma
- Pharmacology and Toxicology Laboratory, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
| | - Vikram Patial
- Pharmacology and Toxicology Laboratory, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
| | - Damanpreet Singh
- Pharmacology and Toxicology Laboratory, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
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33
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Gad ES, Zaitone SA, Moustafa YM. Pioglitazone and exenatide enhance cognition and downregulate hippocampal beta amyloid oligomer and microglia expression in insulin-resistant rats. Can J Physiol Pharmacol 2015; 94:819-28. [PMID: 27389824 DOI: 10.1139/cjpp-2015-0242] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Insulin resistance is known to be a risk factor for cognitive impairment, most likely linked to insulin signaling, microglia overactivation, and beta amyloid (Aβ) deposition in the brain. Exenatide, a long lasting glucagon-like peptide-1 (GLP-1) analogue, enhances insulin signaling and shows neuroprotective properties. Pioglitazone, a peroxisome proliferated-activated receptor-γ (PPAR-γ) agonist, was previously reported to enhance cognition through its effect on Aβ accumulation and clearance. In the present study, insulin resistance was induced in male rats by drinking fructose for 12 weeks. The effect of monotherapy with pioglitazone (10 mg·kg(-1)) and exenatide or their combination on memory dysfunction was determined and some of the probable underlying mechanisms were studied. The current results confirmed that (1) feeding male rats with fructose syrup for 12 weeks resulted in a decline of learning and memory registered in eight-arm radial maze test; (2) treatment with pioglitazone or exenatide enhanced cognition, reduced hippocampal neurodegeneration, and reduced hippocampal microglia expression and beta amyloid oligomer deposition in a manner that is equal to monotherapies. These results may give promise for the use of pioglitazone or exenatide for ameliorating the learning and memory deficits associated with insulin resistance in clinical setting.
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Affiliation(s)
- Enas S Gad
- a Medical Department at Faculty of Commerce, Suez Canal University, Ismailia, Egypt
| | - Sawsan A Zaitone
- b Department of Pharmacology and Toxicology, Faculty of Pharmacy, Suez Canal University, Ismailia 41522, Egypt
| | - Yasser M Moustafa
- b Department of Pharmacology and Toxicology, Faculty of Pharmacy, Suez Canal University, Ismailia 41522, Egypt
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Prasad SN, Bharath MMS. Neurorestorative effects of eugenol, a spice bioactive: Evidence in cell model and its efficacy as an intervention molecule to abrogate brain oxidative dysfunctions in the streptozotocin diabetic rat. Neurochem Int 2015; 95:24-36. [PMID: 26519099 DOI: 10.1016/j.neuint.2015.10.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2015] [Revised: 10/09/2015] [Accepted: 10/24/2015] [Indexed: 02/07/2023]
Abstract
Eugenol (EU), an active principle of cloves, is also widely distributed in various other plants (eg. basil, cinnamon, etc). While its antioxidant and anti-inflammatory properties are well established, biochemical insights related to its neuromodulatory potential in diabetic conditions are not clear. In the present study, initially we investigated its potential to modulate specific biochemical responses in SHSY5Y cells under experimentally -induced hyperglycemic condition. Co-exposure of cells with EU (5-10 μM) not only enhanced the cell viability, but significantly offset glucose -associated oxidative stress (as evidenced by diminished levels of reactive oxygen species and hydroperoxides). Further EU enhanced the reduced glutathione (GSH) levels and also ameliorated the levels of 3 - nitrotyrosine and expression of HSP70. We subsequently examined its efficacy to attenuate biochemical aberrations in brain regions of a streptozotocin (STZ) diabetic rat employing an intervention approach. Brain regions of EU treated (10 mg/kg bw/d, post 6 weeks of STZ) diabetic rats showed diminished levels of oxidative markers and protein carbonyls in both cytosolic and mitochondrial fractions. EU treatment caused enhanced activities of enzymic antioxidants and diminished both GSH and total thiols. Further, activities of complex I - III, succinate dehydrogenase and citrate synthase in brain regions were also significantly restored. Interestingly, EU treatment differentially attenuated the elevated activity of acetylcholinesterase and levels of calcium in brain regions. Collectively, based on the data obtained in in vitro and in vivo models, we hypothesize that EU may be employed as an adjuvant therapeutic molecule to alleviate complications under diabetic conditions.
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Affiliation(s)
- Sathya N Prasad
- Department of Biochemistry & Nutrition, CSIR - Central Food Technological Research Institute (CFTRI), Mysuru 570020, India
| | - M M Srinivas Bharath
- Department of Neurochemistry, National Institute of Mental Health and Neurosciences (NIMHANS), #2900, Hosur Road, Bengaluru 560029, India
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35
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Lei L, Liu Q, Liu S, Huan Y, Sun S, Chen Z, Li L, Feng Z, Li Y, Shen Z. Antidiabetic potential of a novel dual-target activator of glucokinase and peroxisome proliferator activated receptor-γ. Metabolism 2015; 64:1250-61. [PMID: 26189598 DOI: 10.1016/j.metabol.2015.06.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 06/17/2015] [Accepted: 06/18/2015] [Indexed: 01/09/2023]
Abstract
BACKGROUND AND PURPOSE Glucokinase (GK) balances blood glucose levels via regulation of glucose metabolism and insulin secretion. Peroxisome proliferator activated receptor-γ (PPARγ) regulates gene expression in glucose and lipid metabolism. In this study, we investigated the therapeutic effect of a novel compound, SHP289-03, which activates both GK and PPARγ. METHODS Glucose metabolism was tested in primary hepatocytes of normal ICR mice, and insulin secretion was measured in NIT-1 insulinoma cells as well as in primary islets of normal ICR mice. The in vivo pharmacodynamics of SHP289-03 was assessed using the spontaneous type 2 diabetic mouse model, KKA(y). KEY RESULTS In hepatocytes, SHP289-03 promoted glucose consumption. In NIT-1 cells, it increased the concentration of intracellular ATP and calcium, and subsequently enhanced glucose-stimulated insulin secretion in both NIT-1 cells and primary islets. Moreover, SHP289-03 decreased the blood glucose level, improved glucose tolerance and reduced blood lipid levels in KKA(y) mice. It restored islet morphology and increased the beta cell/alpha cell mass ratio, in addition to up-regulating GK gene expression in the liver of KKA(y) mice. DISCUSSION AND CONCLUSIONS SHP289-03 has significant therapeutic potential for the treatment of diabetes mellitus.
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Affiliation(s)
- Lei Lei
- The State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P. R. China
| | - Quan Liu
- The State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P. R. China
| | - Shuainan Liu
- The State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P. R. China
| | - Yi Huan
- The State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P. R. China
| | - Sujuan Sun
- The State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P. R. China
| | - Zhiyu Chen
- The State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P. R. China
| | - Linyi Li
- The State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P. R. China
| | - Zhiqiang Feng
- The State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P. R. China
| | - Yan Li
- The State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P. R. China
| | - Zhufang Shen
- The State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P. R. China.
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Hernández-Salinas R, Decap V, Leguina A, Cáceres P, Perez D, Urquiaga I, Iturriaga R, Velarde V. Antioxidant and anti hyperglycemic role of wine grape powder in rats fed with a high fructose diet. Biol Res 2015; 48:53. [PMID: 26420015 PMCID: PMC4588460 DOI: 10.1186/s40659-015-0045-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2015] [Accepted: 09/22/2015] [Indexed: 12/14/2022] Open
Abstract
Background Metabolic syndrome is a growing worldwide health problem. We evaluated the effects of wine grape powder (WGP), rich in antioxidants and fiber, in a rat model of metabolic syndrome induced by a high fructose diet. We tested whether WGP supplementation may prevent glucose intolerance and decrease oxidative stress in rats fed with a high fructose diet. Methods Male Sprague–Dawley rats weighing 180 g were divided into four groups according to their feeding protocols. Rats were fed with control diet (C), control plus 20 % WGP (C + WGP), 50 % high fructose (HF) or 50 % fructose plus 20 % WGP (HF + WGP) for 16 weeks. Blood glucose, insulin and triglycerides, weight, and arterial blood pressure were measured. Homeostasis model assessment (HOMA) index was calculated using insulin and glucose values. A glucose tolerance test was performed 2 days before the end of the experiment. As an index of oxidative stress, thiobarbituric acid reactive substances (TBARS) level was measured in plasma and kidney, and superoxide dismutase was measured in the kidney. Results Thiobarbituric acid reactive substances in plasma and renal tissue were significantly higher when compared to the control group. In addition, the area under the curve of the glucose tolerance test was higher in HF fed animals. Furthermore, fasting blood glucose, plasma insulin levels, and the HOMA index, were also increased. WGP supplementation prevented these alterations in rats fed with the HF diet. We did not find any significant difference in body weight or systolic blood pressure in any of the groups. Conclusions Our results show that WGP supplementation prevented hyperglycemia, insulin resistance and reduced oxidative stress in rats fed with HF diet. We propose that WGP may be used as a supplement in human food as well.
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Affiliation(s)
- Romina Hernández-Salinas
- Departamento de Fisiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Valerie Decap
- Departamento de Fisiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Alberto Leguina
- Departamento de Fisiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Patricio Cáceres
- Departamento de Fisiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Druso Perez
- Center for Molecular Nutrition and Chronic Diseases, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Ines Urquiaga
- Center for Molecular Nutrition and Chronic Diseases, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Rodrigo Iturriaga
- Departamento de Fisiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile. .,Center for Molecular Nutrition and Chronic Diseases, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Victoria Velarde
- Departamento de Fisiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile. .,Center for Molecular Nutrition and Chronic Diseases, Pontificia Universidad Católica de Chile, Santiago, Chile.
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Porto ML, Lírio LM, Dias AT, Batista AT, Campagnaro BP, Mill JG, Meyrelles SS, Baldo MP. Increased oxidative stress and apoptosis in peripheral blood mononuclear cells of fructose-fed rats. Toxicol In Vitro 2015; 29:1977-81. [PMID: 26279319 DOI: 10.1016/j.tiv.2015.08.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Revised: 08/12/2015] [Accepted: 08/13/2015] [Indexed: 01/12/2023]
Abstract
BACKGROUND Measuring of oxidative stress in peripheral blood mononuclear cells is a suitable model of dietary induced systemic oxidative stress. Thus, we aimed to evaluate whether a chronic high fructose intake could induce oxidative damage in peripheral blood and bone marrow mononuclear cells of rats. METHODS Animals were randomly assigned to the following groups: Control group (standard rat chow and tap water n=8), and Fructose group (standard rat chow and a 10% fructose solution in the drinking water n=8). Reactive oxygen species and cytokines were measure using flow cytometry in peripheral blood and bone-marrow mononuclear cells. Apoptotic cell death and the advanced oxidation protein products (AOPP) were also determined. RESULTS We observed a significant increase in ROS production in peripheral blood mononuclear cells of fructose group as compared to control rats. Apoptosis and the AOPP were higher in those animals underwent high fructose intake. Serum levels of IL-6 and IL-12 were also increased after 12 weeks of high fructose intake. CONCLUSION We concluded that fructose intake leads to systemic oxidative stress and pro-inflammatory condition which affect peripheral blood mononuclear cells and bone-marrow mononuclear cells viability.
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Affiliation(s)
- Marcella L Porto
- Department of Physiological Sciences, Federal University of Espírito Santo, Av Marechal Campos 1468, Maruipe, 29042-755 Vitória, ES, Brazil
| | - Layla M Lírio
- Department of Physiological Sciences, Federal University of Espírito Santo, Av Marechal Campos 1468, Maruipe, 29042-755 Vitória, ES, Brazil
| | - Ananda T Dias
- Department of Physiological Sciences, Federal University of Espírito Santo, Av Marechal Campos 1468, Maruipe, 29042-755 Vitória, ES, Brazil
| | - Alan T Batista
- Department of Physiological Sciences, Federal University of Espírito Santo, Av Marechal Campos 1468, Maruipe, 29042-755 Vitória, ES, Brazil
| | - Bianca P Campagnaro
- Pharmaceutical Sciences Graduate Program, Vila Velha University (UVV), Vila Velha, ES, Brazil
| | - José G Mill
- Department of Physiological Sciences, Federal University of Espírito Santo, Av Marechal Campos 1468, Maruipe, 29042-755 Vitória, ES, Brazil
| | - Silvana S Meyrelles
- Department of Physiological Sciences, Federal University of Espírito Santo, Av Marechal Campos 1468, Maruipe, 29042-755 Vitória, ES, Brazil.
| | - Marcelo P Baldo
- Department of Physiological Sciences, Federal University of Espírito Santo, Av Marechal Campos 1468, Maruipe, 29042-755 Vitória, ES, Brazil.
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Cai Z, Xiao M, Chang L, Yan LJ. Role of insulin resistance in Alzheimer's disease. Metab Brain Dis 2015; 30:839-51. [PMID: 25399337 DOI: 10.1007/s11011-014-9631-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2014] [Accepted: 11/07/2014] [Indexed: 01/01/2023]
Abstract
A critical role of insulin resistance (IR) in Alzheimer's disease (AD) includes beta-amyloid (Aβ) production and accumulation, the formation of neurofibrillary tangles (NFTs), failure of synaptic transmission and neuronal degeneration. Aβ is sequentially cleavaged from APP by two proteolytic enzymes: β-secretase and γ-secretase. IR could regulate Aβ production via enhancing β- and γ-secretase activity. Meanwhile, IR induces oxidative stress and inflammation in the brain which contributes to Aβ and tau pathology. Aβ accumulation can enhance IR through Aβ-mediated inflammation and oxidative stress. IR is a possible linking between amyloid plaques and NFTs pathology via oxidative stress and neuroinflammation. Additionally, IR could disrupt acetylcholine activity, and accelerate axon degeneration and failures in axonal transport, and lead to cognitive impairment in AD. Preclinical and clinical studies have supported that insulin could be useful in the treatment of AD. Thus, an effective measure to inhibit IR may be a novel drug target in AD.
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Affiliation(s)
- Zhiyou Cai
- Department of Neurology, Renmin Hospital, Hubei University of Medicine, Shiyan Renmin Hospital, No. 39 Chaoyang Middle Road, Shiyan, 442000, Hubei Province, People's Republic of China,
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Zhang Y, Zhan RX, Chen JQ, Gao Y, Chen L, Kong Y, Zhong XJ, Liu MQ, Chu JJ, Yan GQ, Li T, He M, Huang QR. Pharmacological activation of PPAR gamma ameliorates vascular endothelial insulin resistance via a non-canonical PPAR gamma-dependent nuclear factor-kappa B trans-repression pathway. Eur J Pharmacol 2015; 754:41-51. [PMID: 25687252 DOI: 10.1016/j.ejphar.2015.02.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 01/31/2015] [Accepted: 02/03/2015] [Indexed: 12/16/2022]
Abstract
Vascular endothelial insulin resistance (IR) is a critically initial factor in cardiocerebrovascular events resulted from diabetes and is becoming a worldwide public health issue. Thiazolidinediones (TZDs) are clinical insulin-sensitizers acting through a canonical peroxisome proliferator-activated receptor gamma (PPARγ)-dependent insulin trans-activation pathway. However, it remains elusive whether there are other mechanisms. In current study, we investigated whether TZDs improve endothelial IR induced by high glucose concentration or hyperglycemia via a non-canonical PPARγ-dependent nuclear factor-kappa B (NF-κB) trans-repression pathway. Our results showed that pre-treatment with TZDs dramatically decrease the susceptibility of endothelial cell to IR, while post-treatment notably improve the endothelial IR both in vitro and in vivo. Moreover, TZDs substantially increase the levels of endothelial nitric oxide synthase (eNOS) and inhibitory κB alpha (IκBα), whereas decrease those of the phosphorylated inhibitory κB kinase alpha/beta (phosphor-IKKα/β) and the cytokines including tumor necrosis factor alpha (TNFα), interleukin-6 (IL-6), soluble intercellular adhesion molecule-1 (sICAM-1) and soluble vascular cellular adhesion molecule-1 (sVCAM-1), suggesting that TZDs act indeed through a PPARγ-dependent NF-κB trans-repression pathway. These findings highlighted a non-canonical mechanism for TZDs to ameliorate endothelial IR which might provide a potential strategy to prevent and treat the diabetic vascular complications clinically.
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Affiliation(s)
- Ying Zhang
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Ri-Xin Zhan
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Jun-Qun Chen
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Yan Gao
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Li Chen
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Ying Kong
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Xiao-Juan Zhong
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Mei-Qi Liu
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Jia-Jia Chu
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Guo-Qiang Yan
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Teng Li
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Ming He
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China
| | - Qi-Ren Huang
- Jiangxi Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang 330006, PR China; Department of Pharmacology, Pharmaceutical Science College, Nanchang University, Nanchang 330006, PR China.
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Abbasnezhad A, Hayatdavoudi P, Niazmand S, Mahmoudabady M. The effects of hydroalcoholic extract of Nigella sativa seed on oxidative stress in hippocampus of STZ-induced diabetic rats. AVICENNA JOURNAL OF PHYTOMEDICINE 2015; 5:333-40. [PMID: 26445713 PMCID: PMC4587602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Oxidative stress plays an important role in the etiology of diabetic complications. Diabetes impairs hippocampus neurogenesis, synaptic plasticity, and learning. The aim of this study was to investigate the effects of hydroalcoholic extract of Nigella sativa seed on oxidative stress in STZ-induced diabetic rats' hippocampus. MATERIALS AND METHODS Diabetes induced by 60 mg/kg STZ, i.p, and the rats were divided into five experimental groups (n=8-10 in each group) including control (received 0.5 ml normal saline), untreated STZ-diabetic (received 0.5 ml normal saline), and treated rats received Nigella sativa extract (200 and 400 mg/kg) or metformin (300 mg/kg) by gavage for 42 days. Serum glucose concentration and body weight as well as hippocampus tissue malondialdehyde and thiol levels were determined by calorimetric assay. RESULTS Serum glucose level in the diabetic rats treated with 200 mg/kg Nigella sativa extract at the days 24 and 45 decreased in comparison to untreated diabetic group (p<0.05, p<0.01, respectively). Weight loss was significantly different between metformin and Nigella sativa extract at the dose of 200 and 400 mg/kg (p<0.05). Thiol content of hippocampus increased by 200 mg/kg Nigella sativa extract in comparison to untreated diabetic group (p<0.05). Malondialdehyde content of hippocampus reduced by Nigella sativa extract, 200 mg/kg (p<0.001), 400 mg/kg (p<0.05), and metformin (p<0.05) in comparison to the untreated diabetic group. CONCLUSION The results of the present study showed that hydroalcoholic extract of the Nigella sativa decreased oxidative stress in hippocampus of the STZ-induced diabetic rats. Nigella sativa at the dose of 200 mg/kg was more effective to reduce oxidative stress in hippocampus of rats.
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Affiliation(s)
- Abbasali Abbasnezhad
- Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Parichehr Hayatdavoudi
- Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Saeed Niazmand
- Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran,Corresponding Author: Tel: +985118002225, Fax: +985118828564,
| | - Maryam Mahmoudabady
- Neurogenic Inflammation Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
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Almasi-Nasrabadi M, Gharedaghi MH, Rezazadeh P, Dehpour AR, Javadi-Paydar M. NMDA receptors interact with the retrieval memory enhancing effect of pioglitazone in mice. Pharmacol Biochem Behav 2014; 126:136-45. [DOI: 10.1016/j.pbb.2014.09.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2014] [Revised: 09/24/2014] [Accepted: 09/26/2014] [Indexed: 12/28/2022]
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Lycopene attenuates insulin signaling deficits, oxidative stress, neuroinflammation, and cognitive impairment in fructose-drinking insulin resistant rats. Neuropharmacology 2014; 86:389-96. [DOI: 10.1016/j.neuropharm.2014.07.020] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 07/17/2014] [Accepted: 07/28/2014] [Indexed: 12/25/2022]
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Insulin resistance in Alzheimer's disease. Neurobiol Dis 2014; 72 Pt A:92-103. [PMID: 25237037 DOI: 10.1016/j.nbd.2014.09.001] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 09/02/2014] [Accepted: 09/05/2014] [Indexed: 12/16/2022] Open
Abstract
Insulin is a key hormone regulating metabolism. Insulin binding to cell surface insulin receptors engages many signaling intermediates operating in parallel and in series to control glucose, energy, and lipids while also regulating mitogenesis and development. Perturbations in the function of any of these intermediates, which occur in a variety of diseases, cause reduced sensitivity to insulin and insulin resistance with consequent metabolic dysfunction. Chronic inflammation ensues which exacerbates compromised metabolic homeostasis. Since insulin has a key role in learning and memory as well as directly regulating ERK, a kinase required for the type of learning and memory compromised in early Alzheimer's disease (AD), insulin resistance has been identified as a major risk factor for the onset of AD. Animal models of AD or insulin resistance or both demonstrate that AD pathology and impaired insulin signaling form a reciprocal relationship. Of note are human and animal model studies geared toward improving insulin resistance that have led to the identification of the nuclear receptor and transcription factor, peroxisome proliferator-activated receptor gamma (PPARγ) as an intervention tool for early AD. Strategic targeting of alternate nodes within the insulin signaling network has revealed disease-stage therapeutic windows in animal models that coalesce with previous and ongoing clinical trial approaches. Thus, exploiting the connection between insulin resistance and AD provides powerful opportunities to delineate therapeutic interventions that slow or block the pathogenesis of AD.
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Capiotti KM, De Moraes DA, Menezes FP, Kist LW, Bogo MR, Da Silva RS. Hyperglycemia induces memory impairment linked to increased acetylcholinesterase activity in zebrafish (Danio rerio). Behav Brain Res 2014; 274:319-25. [PMID: 25157430 DOI: 10.1016/j.bbr.2014.08.033] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 08/12/2014] [Accepted: 08/16/2014] [Indexed: 12/20/2022]
Abstract
Diabetes mellitus, which causes hyperglycemia, affects the central nervous system and can impairs cognitive functions, such as memory. The aim of this study was to investigate the effects of hyperglycemia on memory as well as on the activity of acethylcholinesterase. Hyperglycemia was induced in adult zebrafish by immersion in glucose 111mM by 14 days. The animals were divided in 4 groups: control, glucose-treated, glucose-washout 7-days and glucose-washout 14-days. We evaluated the performance in inhibitory avoidance task and locomotor activity. We also determined acethylcholinesterase activity and gene expression from whole brain. In order to counteract the effect of hyperglycemia underlined by effects on acethylcholinesterase activity, we treated the animals with galantamine (0.05ng/g), an inhibitor of this enzyme. Also we evaluated the gene expression of insulin receptor and glucose transporter from zebrafish brain. The hyperglycemia promoted memory deficit in adult zebrafish, which can be explained by increased AChE activity. The ache mRNA levels from zebrafish brain were decrease in 111mM glucose group and returned to normal levels after 7 days of glucose withdrawal. Insulin receptors (insra-1, insra-2, insrb-1 and insrb-2) and glut-3 mRNA levels were not significantly changed. Our results also demonstrated that galantamine was able to reverse the memory deficit caused by hyperglycemia, demonstrating that these effects involve modulation of AChE activity. These data suggest that the memory impairment induced by hyperglycemia is underlined by the cholinergic dysfunction caused by the mechanisms involving the control of acetylcholinesterase function and gene expression.
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Affiliation(s)
- Katiucia Marques Capiotti
- Laboratório de Neuroquímica e Psicofarmacologia, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, PUCRS, Porto Alegre, RS, Brazil.
| | - Daiani Almeida De Moraes
- Laboratório de Neuroquímica e Psicofarmacologia, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, PUCRS, Porto Alegre, RS, Brazil.
| | - Fabiano Peres Menezes
- Laboratório de Neuroquímica e Psicofarmacologia, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, PUCRS, Porto Alegre, RS, Brazil.
| | - Luiza Wilges Kist
- Laboratório de Biologia Genômica e Molecular, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, PUCRS, Porto Alegre, RS, Brazil; Instituto Nacional de Ciência e Tecnologia Translacional em Medicina (INCT-TM), 90035-003 Porto Alegre, RS, Brazil.
| | - Maurício Reis Bogo
- Laboratório de Biologia Genômica e Molecular, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, PUCRS, Porto Alegre, RS, Brazil; Instituto Nacional de Ciência e Tecnologia Translacional em Medicina (INCT-TM), 90035-003 Porto Alegre, RS, Brazil.
| | - Rosane Souza Da Silva
- Laboratório de Neuroquímica e Psicofarmacologia, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, PUCRS, Porto Alegre, RS, Brazil; Instituto Nacional de Ciência e Tecnologia Translacional em Medicina (INCT-TM), 90035-003 Porto Alegre, RS, Brazil.
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Elevated risk of type 2 diabetes for development of Alzheimer disease: a key role for oxidative stress in brain. Biochim Biophys Acta Mol Basis Dis 2014; 1842:1693-706. [PMID: 24949886 DOI: 10.1016/j.bbadis.2014.06.010] [Citation(s) in RCA: 260] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 06/05/2014] [Accepted: 06/09/2014] [Indexed: 12/23/2022]
Abstract
Alzheimer disease (AD) is the most common form of dementia among the elderly and is characterized by progressive loss of memory and cognition. Epidemiological data show that the incidence of AD increases with age and doubles every 5 years after 65 years of age. From a neuropathological point of view, amyloid-β-peptide (Aβ) leads to senile plaques, which, together with hyperphosphorylated tau-based neurofibrillary tangles and synapse loss, are the principal pathological hallmarks of AD. Aβ is associated with the formation of reactive oxygen (ROS) and nitrogen (RNS) species, and induces calcium-dependent excitotoxicity, impairment of cellular respiration, and alteration of synaptic functions associated with learning and memory. Oxidative stress was found to be associated with type 2 diabetes mellitus (T2DM), which (i) represents another prevalent disease associated with obesity and often aging, and (ii) is considered to be a risk factor for AD development. T2DM is characterized by high blood glucose levels resulting from increased hepatic glucose production, impaired insulin production and peripheral insulin resistance, which close resemble to the brain insulin resistance observed in AD patients. Furthermore, growing evidence suggests that oxidative stress plays a pivotal role in the development of insulin resistance and vice versa. This review article provides molecular aspects and the pharmacological approaches from both preclinical and clinical data interpreted from the point of view of oxidative stress with the aim of highlighting progresses in this field.
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