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Beta cells AND Polyphenols

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https://www.readbyqxmd.com/read/28754022/unfolding-novel-mechanisms-of-polyphenol-flavonoids-for-better-glycaemic-control-targeting-pancreatic-islet-amyloid-polypeptide-iapp
#1
REVIEW
Ivana R Sequeira, Sally D Poppitt
Type 2 diabetes (T2D) is characterised by hyperglycaemia resulting from defective insulin secretion, insulin resistance, or both. The impact of over-nutrition and reduced physical activity, evidenced by the exponential rise in obesity and the prevalence of T2D, strongly supports the implementation of lifestyle modification programs. Accordingly, an increased consumption of fruits and plant-derived foods has been advocated, as their intake is inversely correlated with T2D prevalence; this has been attributed, in part, to their contained polyphenolic compounds...
July 21, 2017: Nutrients
https://www.readbyqxmd.com/read/28669771/antidiabetic-antioxidant-and-anti-inflammatory-properties-of-water-and-n-butanol-soluble-extracts-from-saharian-anvillea-radiata-in-high-fat-diet-fed-mice
#2
Chouaib Kandouli, Mathieu Cassien, Anne Mercier, Caroline Delehedde, Emilie Ricquebourg, Pierre Stocker, Mourad Mekaouche, Zineb Leulmi, Aicha Mechakra, Sophie Thétiot-Laurent, Marcel Culcasi, Sylvia Pietri
ETHNOPHARMACOLOGICAL RELEVANCE: According to Saharian traditional medicine, Anvillea radiata Coss. & Dur. (Asteraceae) has been valued for treating a variety of ailments such as gastro-intestinal, liver and pulmonary diseases, and has gained awareness for its beneficial effect on postprandial hyperglycemia. However, to best of our knowledge, no detailed study of the antidiabetic curative effects of this plant has been conducted yet. AIM OF THE STUDY: To determine the hypoglycemic and antidiabetic effect of dietary supplementation with Anvillea radiata extracts on high-fat-diet (HFD)-induced obesity and insulin resistance in C57BL/6J mice in relation with antioxidant, anti-inflammatory, pancreatic beta-cells and skeletal muscle protection, and digestive enzyme inhibiting properties...
July 31, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28610976/dioscin-suppresses-tgf-%C3%AE-1-induced-epithelial-mesenchymal-transition-and-suppresses-a549-lung-cancer-migration-and-invasion
#3
Won-Chul Lim, Hyunhee Kim, Young-Joo Kim, Kyung-Chul Choi, In Ho Lee, Ki Heon Lee, Mi Kyung Kim, Hyeonseok Ko
Epithelial-to-mesenchymal transition (EMT), an important cellular process, occurs during cancer development and progression, has a crucial role in metastasis by enhancing the motility of tumor cells. Dioscin is a polyphenolic component isolated from Phyllanthus amarus, which exhibits a wide range of pharmacological and physiological activities, such as anti-tumor, anti-inflammatory, anti-obesity, anti-fungal, and anti-viral activities. However, the possible role of dioscin in the EMT is unclear. We investigated the suppressive effect of dioscin on the EMT...
August 1, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28567323/comparative-neuroprotective-effects-of-dietary-curcumin-and-solid-lipid-curcumin-particles-in-cultured-mouse-neuroblastoma-cells-after-exposure-to-a%C3%AE-42
#4
Panchanan Maiti, Gary L Dunbar
Aggregation of amyloid beta protein (Aβ) and phosphorylated tau (p-Tau) plays critical roles in pathogenesis of Alzheimer's disease (AD). As an antiamyloid natural polyphenol, curcumin (Cur) has a potential role in prevention of neurodegeneration in AD. However, due to limited absorption of the dietary Cur, the solid lipid Cur particles (SLCP) have been suggested as being more effective for AD therapy. In the present study, we compared the role of dietary Cur and SLCP on oxidative stress, neuronal death, p-Tau level, and certain cell survival markers in vitro, after exposure to Aβ42...
2017: International Journal of Alzheimer's Disease
https://www.readbyqxmd.com/read/28456938/glioprotective-effect-of-resveratrol-an-emerging-therapeutic-role-for-oligodendroglial-cells
#5
Priscila Machado Rosa, Leo Anderson Meira Martins, Diogo Onofre Souza, André Quincozes-Santos
Resveratrol is a natural polyphenol compound highly found in red wine that displays several beneficial effects on the central nervous system (CNS), preventing or slowing the progression of a wide variety of neurological diseases. Its neuroprotective role is particularly associated to modulation of antioxidant and anti-inflammatory responses in glial cells in a mechanism dependent of heme oxygenase 1 (HO-1) signaling pathway. Oligodendrocyte progenitor cells (OPC), primarily known for giving rise to mature oligodendrocytes, have emerged as dynamic cells that are also important to maintain the CNS homeostasis...
April 29, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28416441/glechoma-hederacea-extracts-attenuate-cholestatic-liver-injury-in-a-bile-duct-ligated-rat-model
#6
Ya-Yu Wang, Shih-Yi Lin, Wen-Ying Chen, Su-Lan Liao, Chih-Cheng Wu, Pin-Ho Pan, Su-Tze Chou, Chun-Jung Chen
ETHNOPHARMACOLOGICAL RELEVANCE: In traditional Chinese medicine, Glechoma hederacea is frequently prescribed to patients with cholelithiasis, dropsy, abscess, diabetes, inflammation, and jaundice. Polyphenolic compounds are main bioactive components of Glechoma hederacea. AIM OF THE STUDY: This study was aimed to investigate the hepatoprotective potential of hot water extract of Glechoma hederacea against cholestatic liver injury in rats. MATERIALS AND METHODS: Cholestatic liver injury was produced by ligating common bile ducts in Sprague-Dawley rats...
April 14, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28358620/daily-coffee-intake-inhibits-pancreatic-beta-cell-damage-and-nonalcoholic-steatohepatitis-in-a-mouse-model-of-spontaneous-metabolic-syndrome-tsumura-suzuki-obese-diabetic-mice
#7
Syunsuke Watanabe, Tetsuyuki Takahashi, Hirohisa Ogawa, Hisanori Uehara, Takaaki Tsunematsu, Hayato Baba, Yuki Morimoto, Koichi Tsuneyama
BACKGROUND: Metabolic syndrome is one of the most important health issues worldwide. Obesity causes insulin resistance, hyperlipidemia, diabetes, and various diseases throughout the body. The liver phenotype, which is called nonalcoholic steatohepatitis (NASH), frequently progresses to hepatocellular carcinoma. We recently established a new animal model, Tsumura-Suzuki obese diabetic (TSOD) mice, which spontaneously exhibit obesity, diabetes, hyperlipidemia, and NASH with liver nodules...
May 2017: Metabolic Syndrome and related Disorders
https://www.readbyqxmd.com/read/28280523/resveratrol-attenuates-copper-induced-senescence-by-improving-cellular-proteostasis
#8
Liliana Matos, Alexandra Monteiro Gouveia, Henrique Almeida
Copper sulfate-induced premature senescence (CuSO4-SIPS) consistently mimetized molecular mechanisms of replicative senescence, particularly at the endoplasmic reticulum proteostasis level. In fact, disruption of protein homeostasis has been associated to age-related cell/tissue dysfunction and human disorders susceptibility. Resveratrol is a polyphenolic compound with proved antiaging properties under particular conditions. In this setting, we aimed to evaluate resveratrol ability to attenuate cellular senescence induction and to unravel related molecular mechanisms...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28265554/protective-role-of-hesperidin-against-%C3%AE-radiation-induced-oxidative-stress-and-apoptosis-in-rat-testis
#9
Nadia Z Shaban, Ahmed M Ahmed Zahran, Fatma H El-Rashidy, Ahmad S Abdo Kodous
BACKGROUND: Gamma (γ) ray, an electromagnetic radiation, is occasionally accompanying the emission of an alpha or beta particle. Exposure to such radiation can cause cellular changes such as mutations, chromosome aberration and cellular damage which depend upon the total amount of energy, duration of exposure and the dose. Ionizing radiation can impair spermatogenesis and can cause mutations in germ cells. In general, type B spermatogonia are sensitive to this type of radiation. The current study was carried out to evaluate the protective role of hesperidin (H), as a polyphenolic compound, on rat testis injury induced by γ-radiation...
December 2017: Journal of Biological Research
https://www.readbyqxmd.com/read/27700119/biomimetic-apoe-reconstituted-high-density-lipoprotein-nanocarrier-for-blood-brain-barrier-penetration-and-amyloid-beta-targeting-drug-delivery
#10
Qingxiang Song, Huahua Song, Jianrong Xu, Jialin Huang, Meng Hu, Xiao Gu, Juan Chen, Gang Zheng, Hongzhuan Chen, Xiaoling Gao
Amyloid beta (Aβ) and its aggregation forms in the brain have been suggested as key targets for the therapy of Alzheimer's disease (AD). Therefore, the development of nanocarriers that possess both blood-brain barrier permeability and Aβ-targeting ability is of great importance for the intervention of AD. Here we constructed a biomimetic nanocarrier named apolipoprotein E (ApoE)-reconstituted high density lipoprotein nanocarrier (ANC) from recombinant ApoE and synthetic lipids to achieve the above goals. α-Mangostin (α-M), a polyphenolic agent that can inhibit the formation of Aβ oligomers and fibrils and accelerate Aβ cellular degradation, was used as the model drug...
November 7, 2016: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/27693453/development-of-a-neuroprotective-potential-algorithm-for-medicinal-plants
#11
Weixi Liu, Hang Ma, Nicholas A DaSilva, Kenneth N Rose, Shelby L Johnson, Lu Zhang, Chunpeng Wan, Joel A Dain, Navindra P Seeram
Medicinal plants are promising candidates for Alzheimer's disease (AD) research but there is lack of systematic algorithms and procedures to guide their selection and evaluation. Herein, we developed a Neuroprotective Potential Algorithm (NPA) by evaluating twenty-three standardized and chemically characterized Ayurvedic medicinal plant extracts in a panel of bioassays targeting oxidative stress, carbonyl stress, protein glycation, amyloid beta (Aβ) fibrillation, acetylcholinesterase (AChE) inhibition, and neuroinflammation...
September 29, 2016: Neurochemistry International
https://www.readbyqxmd.com/read/27504055/2-3-5-4-tetrahydroxystilbene-2-o-%C3%AE-glucoside-isolated-from-polygoni-multiflori-ameliorates-the-development-of-periodontitis
#12
Yu-Tang Chin, Meng-Ti Hsieh, Chi-Yu Lin, Po-Jan Kuo, Yu-Chen S H Yang, Ya-Jung Shih, Hsuan-Yu Lai, Guei-Yun Cheng, Heng-Yuan Tang, Chen-Chen Lee, Sheng-Yang Lee, Ching-Chiung Wang, Hung-Yun Lin, Earl Fu, Jacqueline Whang-Peng, Leroy F Liu
Periodontitis, a chronic infection by periodontopathic bacteria, induces uncontrolled inflammation, which leads to periodontal tissue destruction. 2,3,5,4'-Tetrahydroxystilbene-2-O-beta-glucoside (THSG), a polyphenol extracted from Polygoni Multiflori, reportedly has anti-inflammatory properties. In this study, we investigated the mechanisms of THSG on the Porphyromonas gingivalis-induced inflammatory responses in human gingival fibroblasts and animal modeling of ligature-induced periodontitis. Human gingival fibroblast cells were treated with lipopolysaccharide (LPS) extracted from P...
2016: Mediators of Inflammation
https://www.readbyqxmd.com/read/27427935/efficient-inhibition-of-protein-aggregation-disintegration-of-aggregates-and-lowering-of-cytotoxicity-by-green-tea-polyphenol-based-self-assembled-polymer-nanoparticles
#13
Koushik Debnath, Shashi Shekhar, Vipendra Kumar, Nihar R Jana, Nikhil R Jana
Green tea polyphenol epigallocatechin-3-gallate (EGCG) is known for its antiamyloidogenic property, and it is observed that molecular EGCG binds with amyloid structure, redirects fibrillation kinetics, remodels mature fibril, and lowers the amyloid-derived toxicity. However, this unique property of EGCG is difficult to utilize because of their poor chemical stability and substandard bioavailability. Here we report a nanoparticle form of EGCG of 25 nm size (nano-EGCG) which is 10-100 times more efficient than molecular EGCG in inhibiting protein aggregation, disintegrating mature protein aggregates, and lowering amyloidogenic cytotoxicity...
August 10, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27383500/arabidopsis-thaliana-extracts-optimized-for-polyphenols-production-as-potential-therapeutics-for-the-apoe-modulated-neuroinflammation-characteristic-of-alzheimer-s-disease-in-vitro
#14
Shivesh Ghura, Leon Tai, Ming Zhao, Nicole Collins, Chun-Tao Che, Katherine M Warpeha, Mary Jo LaDu
Although the cause of Alzheimer's disease (AD) is unknown, glial-induced neuroinflammation is an early symptom. Familial AD is caused by increases in amyloid-beta (Aβ) peptide, particularly soluble oligomeric (oAβ), considered a proximal neurotoxin and neuroinflammatory stimuli. APOE4, a naturally occurring genotype of APOE, is the greatest genetic risk factor for AD; increasing risk up to 12-fold compared to APOE3 and APOE2. oAβ-induced neuroinflammation is greater with APOE4 compared to APOE3 and APOE2...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27356540/neurotrophins-modulation-by-olive-polyphenols
#15
REVIEW
Valentina Carito, Mauro Ceccanti, Luigi Tarani, Giampiero Ferraguti, George N Chaldakov, Marco Fiore
BACKGROUND: Polyphenols are probably the most known and investigated molecules of nutritional interest as micronutrients present in abundance in our diet. Some of the most important food sources of polyphenols in the Mediterranean diet are olives and olive oil. A growing body of evidence from animal models to clinical studies indicates that polyphenol compounds may have neuroprotective effects in several pathologies of the nervous system through the control of oxidative stress, inflammation, apoptosis and mitochondrial dysfunction...
2016: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/27168327/carnosic-acid-prevents-beta-amyloid-induced-injury-in-human-neuroblastoma-sh-sy5y-cells-via-the-induction-of-autophagy
#16
Jie Liu, Hua Su, Qiu-Min Qu
Beta-amyloid (Aβ), the hallmark protein in Alzheimer's disease (AD), induces neurotoxicity that involves oxidative stress and mitochondrial dysfunction, leading to cell death. Carnosic acid (CA), a polyphenolic diterpene isolated from the herb rosemary (Rosemarinus officinalis), was investigated in our study to assess its neuroprotective effect and underlying mechanism against Aβ-induced injury in human neuroblastoma SH-SY5Y cells. We found that CA pretreatment alleviated the Aβ25-35-induced loss of cell viability, inhibited both Aβ1-42 accumulation and tau hyperphosphorylation, reduced reactive oxygen species generation, and maintained the mitochondrial membrane potential...
September 2016: Neurochemical Research
https://www.readbyqxmd.com/read/27148322/cold-temperature-delays-wound-healing-in-postharvest-sugarbeet-roots
#17
Karen K Fugate, Wellington S Ribeiro, Edward C Lulai, Edward L Deckard, Fernando L Finger
Storage temperature affects the rate and extent of wound-healing in a number of root and tuber crops. The effect of storage temperature on wound-healing in sugarbeet (Beta vulgaris L.) roots, however, is largely unknown. Wound-healing of sugarbeet roots was investigated using surface-abraded roots stored at 6 and 12°C for 28 days. Surface abrasions are common injuries of stored roots, and the storage temperatures used are typical of freshly harvested or rapidly cooled roots. Transpiration rate from the wounded surface and root weight loss were used to quantify wound healing...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27134467/in-vitro-screening-on-amyloid-beta-modulation-of-aqueous-extracts-from-plant-seeds
#18
Yoshinori Okada, Mizue Okada
INTRODUCTION: Glycation process might contribute to both extensive protein cross-linking and oxidative stress in Alzheimer's disease (AD). The amyloid-like aggregation of glycated bovine serum albumin induces apoptosis in the neuronal cell. Dietary supplementation of antioxidants, vitamins, and polyphenols are beneficial to AD, and consumption of fruits and vegetables reduce the risk of AD. We conducted a screening of 14 aqueous extracts from plant seeds (PSAE) for inhibitory activity on amyloid beta (Aβ)...
April 2016: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/27057673/anti-hemolytic-hemagglutination-inhibition-and-bacterial-membrane-disruptive-properties-of-selected-herbal-extracts-attenuate-virulence-of-carbapenem-resistant-escherichia-coli
#19
Pallavi Thakur, Raman Chawla, Alka Narula, Rajeev Goel, Rajesh Arora, Rakesh Kumar Sharma
Expression of a multitude of virulence factors by multi-drug resistant microbial strains, e.g., Carbapenem Resistant Escherichia coli (Family: Enterobacteriaceae; Class: Gammaproteobacteria), is responsible for resistance against beta-lactam antibiotics. Hemolysin production and induction of hemagglutination by bacterial surface receptors inflicts direct cytotoxicity by destroying host phagocytic and epithelial cells. We have previously reported that Berberis aristata, Camellia sinensis, Cyperus rotundus Holarrhena antidysenterica and Andrographis paniculata are promising herbal leads for targeting Carbapenem resistant Escherichia coli...
June 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/26836197/nanoformulated-alpha-mangostin-ameliorates-alzheimer-s-disease-neuropathology-by-elevating-ldlr-expression-and-accelerating-amyloid-beta-clearance
#20
Lei Yao, Xiao Gu, Qingxiang Song, Xiaolin Wang, Meng Huang, Meng Hu, Lina Hou, Ting Kang, Jun Chen, Hongzhuan Chen, Xiaoling Gao
Alzheimer's disease (AD), the most common form of dementia, is now representing one of the largest global healthcare challenges. However, an effective therapy is still lacking. Accumulation of amyloid-beta (Aβ) in the brain is supposed to trigger pathogenic cascades that eventually lead to AD. Therefore, Aβ clearance strategy is being actively pursued as a promising disease modifying therapy. Here, we found that α-mangostin (α-M), a polyphenolic xanthone derivative from mangosteen, up-regulated low density lipoprotein receptor (LDLR) expression in microglia and liver cells, and efficiently facilitated Aβ clearance...
March 28, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
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