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Beta cells AND Luteoline

Syed Haris Omar, Christopher J Scott, Adam S Hamlin, Hassan K Obied
The focus of this study was on inhibition of enzymes involved in the pathogenesis Alzheimer's disease (AD) including prime amyloid beta (Aβ) producing enzyme (β-secretase: BACE-1) and disease progression enzymes including acetylcholinesterase (AChE), butyrylcholinesterase (BChE), histone deacetylase (HDAC), and tyrosinase along with the catecholamine L-DOPA, by using olive biophenols. Here we report the strongest inhibition of BACE-1 from rutin (IC50 : 3.8 nM) followed by verbascoside (IC50 : 6.3 nM) and olive fruit extract (IC50 : 18 ng), respectively...
May 14, 2018: Fitoterapia
Osasenaga Macdonald Ighodaro, Oluseyi Adeboye Akinloye
BACKGOUND: Ethnobatanical survey associates Sapium ellipticum (SE) with antidiabetic usage among other medicinal functions in different parts of Africa. More importantly, previous studies on the plant extract in our laboratory showed that SE has significant effects on the activities of carbohydrate metabolizing enzymes such as glucokinase, glucose-6-phosphatase, α-amylase and α-glucosidase. In view of these, the anti-diabetic potential of the plant leaf extract in streptozotocin (STZ)-induced diabetes rat model (Wistar strain) was examined...
December 8, 2017: BMC Complementary and Alternative Medicine
Supatcharee Siriwong, Kanjana Thumanu, Tanaporn Hengpratom, Griangsak Eumkeb
Streptococcus pyogenes causes streptococcal toxic shock syndrome. The recommended therapy has been often failure through the interfering of beta-lactamase-producing bacteria (BLPB). The present study was to investigate antibacterial activity, synergy, and modes of action of luteolin and quercetin using alone and plus ceftazidime against S. pyogenes. The MICs of ceftazidime, luteolin, and quercetin against all S. pyogenes were 0.50, 128, and 128 µg mL(-1), respectively. A synergistic effect was exhibited on luteolin and quercetin plus ceftazidime against these strains at fractional inhibitory concentration indices 0...
2015: Evidence-based Complementary and Alternative Medicine: ECAM
Yu-Jie Fu, Wei Liu, Yuan-Gang Zu, Mei-Hong Tong, Shuang-Ming Li, Ming-Ming Yan, Thomas Efferth, Hao Luo
Luteolin and apigenin are naturally occurring flavones with a wide spectrum of pharmacological properties. In the present study, enzyme assisted extraction of luteolin and apigenin from pigeonpea leaves using commercial plant cell wall degrading enzyme preparations including cellulase, beta-glucosidase and pectinase were examined. We found that pectinase offered a better performance in enhancement of the extraction yields of luteolin and apigenin than cellulase and beta-glucosidase. The pectinase assisted extraction process was further optimized by varying different parameters such as pectinase concentration, time of incubation, pH of pectinase solution, and incubation temperature...
November 15, 2008: Food Chemistry
Hitoshi Ashida, Kiyonari Harada, Sakiho Mishima, Takakazu Mitani, Yoko Yamashita, Fumio Matsumura
2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) causes various toxic effects, including wasting syndrome, through activation of an aryl hydrocarbon receptor (AhR). Our previous report demonstrated that certain flavonoids inhibit the activation of AhR and suppress its DNA binding activity. In this study, we searched for an active compound among 13 flavonoids that suppressed TCDD-induced loss of lipid accumulation using 3T3-L1 adipocytes as a cell culture model for wasting syndrome. Two flavonoids, luteolin and epigallocatechin gallate, suppressed TCDD-induced loss of lipid accumulation in this model...
May 2015: Pesticide Biochemistry and Physiology
Xu-hong Duan, Pei He, Zong-min Ma, Lin Pei
This research is to investigate study the flavonoids from stems of Nelumbo nucifera and the cytotoxic activities of iso- lated compounds. The constituents were separated by column chromatography,and their structures were elucidated by spectroscopic data analyses. The isolated compounds were evaluated for cytoxic activities by MTT method. Twelve compounds were isolated and identified as rhamnazin-3-O-beta-D-glucopyranoside (1), luteolin-3', 4'-dimethylether-7-O-beta-D-glucoside (2), kaempferol-3-O-beta-D-xylopyranosyl-(1-->2)-O-beta-D-glucopyranoside (3), quercetin-3,3'-di-O-beta-D-glucopyranoside (4), 1, 8-dihydroxy-3,7-dimethoxyxanthone (5), isorhamnetin-3-O-beta-D-glucopyranoside(6) , kaempferol(7), isorhamnetin (8), quercetin(9), astragalin(10), hyperoside (11) and 1-hy- droxy-3,7,8-trimethoxyxanthone(12)...
November 2014: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Amira Mira, Shuntaro Yamashita, Yoshinori Katakura, Kuniyoshi Shimizu
Angelica shikokiana is widely marketed in Japan as a dietary food supplement. With a focus on neurodegenerative conditions such as Alzheimer's disease, the aerial part was extracted and through bio-guided fractionation, fifteen compounds [α-glutinol, β-amyrin, kaempferol, luteolin, quercetin, kaempferol-3-O-glucoside, kaempferol-3-O-rutinoside, methyl chlorogenate, chlorogenic acid, hyuganin E, 5-(hydroxymethyl)-2-furaldehyde, β-sitosterol-3-O-glucoside, adenosine (isolated for the first time from A. shikokiana), isoepoxypteryxin and isopteryxin] were isolated...
2015: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Nan Zheng, Peng Yuan, Changhao Li, Jun Wu, Jian Huang
Beta-secretase (BACE1) controls an essential step for the generation of amyloid- peptide (Aβ). As Aβ forms the principle pathologies in Alzheimer’s disease, lowering A production by inhibiting BACE1 is a plausible therapeutic approach. In the present study, we identified a natural polyphenol, luteolin, as a potent inhibitor of BACE1 transcription inhuman embryonic kidney 293 (HEK293) and human neuroblastoma (SH-SY5Y) cell lines. Luteolin is capable of suppressing the activation of BACE1 promoter by NF-κB signaling...
2015: Journal of Alzheimer's Disease: JAD
Liyi Yang, Kimberly F Allred, Linda Dykes, Clinton D Allred, Joseph M Awika
Activation of estrogen receptor-β (ERβ) is an important mechanism for colon cancer prevention. Specific sorghum varieties that contain flavones were shown to activate ER in non-malignant colonocytes at low concentrations. This study aimed to determine positive interactions among estrogenic flavonoids most relevant in sorghum. Apigenin and naringenin were tested separately and in combination for their ability to influence ER-mediated cell growth in non-malignant young adult mouse colonocytes (YAMC). Sorghum extracts high in specific flavanones and flavones were also tested...
March 2015: Food & Function
Fengchao Shi, Dun Zhou, Zhongqiu Ji, Zhaofeng Xu, Huilin Yang
To investigate anti-arthritic activity of luteolin (Lut) in Freund's complete adjuvant (FCA)-induced arthritis (AA) in rats. AA was induced by injecting with Freund's complete adjuvant (FCA). Male rats were randomly divided into five groups with 10 mice in each group: (1) control group (saline), (2) AA group, (3) AA+Diclofenac Sodium (AA+DS, 5 mg/kg), (4) AA+Lut (20 mg/kg), (5) AA+Lut (40 mg/kg). Male SD rats were subjected to treatment with Lut at 10 and 20 mg/kg from days 18 to 24 after immunization. Arthritic scores, tumor necrosis factor-alpha (TNF-α), interleukin-1 beta (IL-1β), interleukin-6 (IL-6), interleukin-17 (IL-17), paw histopathology and the proteins of P2X4 pathway were assessed at the end of the experiment...
January 25, 2015: Chemico-biological Interactions
Alana L Gray, Charles A Stephens, Rebecca L H Bigelow, David T Coleman, James A Cardelli
The presence of reactive stroma, predominantly composed of myofibroblasts, is directly associated with and drives prostate cancer progression. We have previously shown that (-)-Epigallocatechin-3-gallate (EGCG), in the form of Polyphenon E, significantly decreases serum levels of HGF and VEGF in prostate cancer patients. Given that HGF and VEGF are secreted from surrounding tumor myofibroblasts, these observations suggested that EGCG may inhibit prostate cancer-associated myofibroblast differentiation. Herein, we demonstrate that micromolar combinations of EGCG and a second polyphenol, luteolin, synergistically inhibit TGF-β-induced myofibroblast phenotypes in prostate fibroblast cell lines, as observed primarily by potentiation of fibronectin expression...
2014: PloS One
Longhuo Wu, Haiqing Liu, Linfu Li, Hai Liu, Kai Yang, Zhaowen Liu, Hao Huang
Osteoarthritis (OA) is a progressive joint disorder, which remains the leading cause of chronic disability in aged people. This study is the first report which demonstrates the cartilage protective effect of 5,7,3',4'-tetramethoxyflavone (TMF) by decreasing the concentration of IL-1β, TNF-α and PGE2 in the knee synovial fluid in OA rat models in vivo. In vitro, after induced by PGE2, the apoptosis rate of chondrocytes was significantly increased. In addition, PGE2 increased the expression of cAMP/PKA signaling pathway in chondrocytes, stabilized and accumulated β-catenin, and activated the expression of β-catenin signaling pathway...
September 26, 2014: Biochemical and Biophysical Research Communications
Irene Paterniti, Marika Cordaro, Michela Campolo, Rosalba Siracusa, Carolin Cornelius, Michele Navarra, Salvatore Cuzzocrea, Emanuela Esposito
Alzheimer's disease (AD) is the most common neurodegenerative disorder. Its neuropathological hallmarks include deposition of beta amyloid (Aβ) fibrils in senile plaques. Numerous biochemical events, leading to Aβ neurotoxicity in AD, have been proposed and it seems that neuroinflammation plays a prominent role among these. Thus, since inflammatory processes and oxidative stress are considered to play an important role in neuroinflammatory disorders and in AD pathology, in the present work we decided to test a new composite, which is a formulation constituted of an anti-inflammatory compound such as palmitoylethanolamide (PEA) and the well recognized antioxidant flavonoid luteolin (Lut), subjected to an ultra-micronization process, here designated co-ultraPEALut...
2014: CNS & Neurological Disorders Drug Targets
Ashok Kumar Pandurangan, Norhaizan Mohd Esa
Luteolin, 3', 4', 5,7-tetrahydroxyflavone, belongs to a group of naturally occurring compounds called flavonoids that are found widely in the plant kingdom. It possesses many beneficial properties including antioxidant, anti- inflammatory, anti-bacterial, anti-diabetic and anti-proliferative actions. Colorectal cancer (CRC) is a leading cause of cancer related deaths worldwide. Many signaling pathways are deregulated during the progression of colon cancer. In this review we aimed to analyze the protection offered by luteolin on colon cancer...
2014: Asian Pacific Journal of Cancer Prevention: APJCP
Zhengfu Tai, Yuan Lin, Yujiao He, Junmei Huang, Jiajia Guo, Lijuan Yang, Guolin Zhang, Fei Wang
New negative regulators of interferon (IFN) signaling, preferably with tissue specificity, are needed to develop therapeutic means to enhance the efficacy of type I IFNs (IFN-α/β) and reduce their side effects. We conducted cell-based screening for IFN signaling enhancer and discovered that luteolin, a natural flavonoid, sensitized the antiproliferative effect of IFN-α in hepatoma HepG2 cells and cervical carcinoma HeLa cells. Luteolin promoted IFN-β-induced Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathway activation by enhancing the phosphorylation of Jak1, Tyk2, and STAT1/2, thereby promoting STAT1 accumulation in the nucleus and endogenous IFN-α-regulated gene expression...
March 2014: Cellular Signalling
Shuang-Gang Ma, Shao-Peng Yuan, Qi Hou, Yong Li, Xia Chen, Shi-Shan Yu
Eight compounds were isolated from the leaves of Turpinia arguta by various chromatograhic techniques such as D101 macroporous resin, polyamide, Sephadex LH-20,and HPLC chromatography, and their structures were elucidated as rhoifolin (1), apigenin-7-O- [2"-O-alpha-L-rhamnopyranosyl-6"-O-alpha-L-rhamnopyranosyl] -beta-D-glucopyranoside (2), acacetin-7-O- [2"-O-alpha-L-rhamnopyranosyl-6"-O-beta-D-glucopyranosyl] -beta-D-glucopyranoside (3), acacetin-7-O- [2"-O-alpha-L-rhamnopyranosyl-6"-O-alpha-L-rhamnopyranosyl] -beta-D-glucopyranoside(neobudofficide, 4), luteolin-7-O-[2"-O-beta-D-glucopyranosyl] -beta-D-glucopyranoside (5), chrysoeiml-7-O-[2"-O-beta-D-glucopyranosyl] -beta-D-glucopyranoside (6), acacetin-7-O-alpha-L-rhamnopyranosyl-(1 --> 6) -O-beta-D-glucopyranoside (buddleoside, linarin, 7), and apigenin 6, 8-di-C-beta-D-glucopyranoside (8) on the basis of spectral data analysis...
June 2013: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Mandana Behbahani, Mehrnaz Shanehsaz Zadeh, Hassan Mohabatkar
AIM: This study was carried out to check antiherpetic substances of crude methanol leaf extract of Avicenna marina and its column chromatographic fractions. BACKGROUND: Herpes simplex virus 2 (HSV-2) is a harmful pathogen especially in highly susceptible individuals. MATERIALS AND METHODS: The antiherpetic activity of crude methanol extract and sub-fractions was performed in different concentrations (20, 2, 0.2, and 0.02μg/ml) by use of plaque-forming unit (PFU) assay and real time polymerase chain reaction (PCR) assay...
March 2013: Antiviral Research
Hyoung Joon Park, Byung Yeoup Chung, Min-Kwon Lee, Yuno Song, Seung Sik Lee, Gyo Moon Chu, Suk-Nam Kang, Young Min Song, Gon-Sup Kim, Jae-Hyeon Cho
BACKGROUND: Centipede grass (CG) originates from China and South America and is reported to contain several C-glycosyl flavones and phenolic constituents, including maysin and luteolin derivatives. This study aimed to investigate, for the first time, the antiobesity activity of CG and its potential molecular mechanism in 3T3-L1 cells. METHODS: To study the effect of CG on adipogenesis, differentiating 3T3-L1 cells were treated every day with CG at various concentrations (0-100 μg/ml) for six days...
November 26, 2012: BMC Complementary and Alternative Medicine
Gloria Gutiérrez-Venegas, Anabel Contreras-Sánchez
Periodontitis is an inflammatory process of infectious origin that affects the gums and, in severe cases, destroys connective tissue, leading to loss of the dental organ. Gram-negative Porphyromonas gingivalis bacteria are recovered from patients with chronic periodontitis. The polysaccharide obtained from these bacteria induces the expression of interleukin (IL)-1 beta, tumor necrosis factor, and IL-6. Flavonoids are molecules that participate in the control of inflammatory processes. We studied the role of the flavonoids fisetin, luteolin, myricetin, and morin in inhibiting the activation of mitogen-activated protein kinase (MAPK) and AKT as well as their role in lipopolysaccharide (LPS)-induced cyclooxygenase-2 (COX-2) transcription...
January 2013: Molecular Biology Reports
Hiroko Isoda, Hideko Motojima, Delphine Margout, Marcos Neves, Junkyu Han, Mitsutoshi Nakajima, Michel Larroque
The inhibitory effect of Picholine olive oil from Montpellier in Southern France on the chemical mediator release in type I allergy, using rat basophilic leukemia (RBL-2H3) cells, was investigated. Oil-in-water (O/W) emulsions prepared using Picholine olive oil showed an inhibitory effect on the chemical mediator release and decreased expressions of genes related to type I allergy in RBL-2H3 cells. We then measured the phenolic compounds present in Picholine olive oil using high-performance liquid chromatography and investigated some physical properties, such as droplet size, size distribution, viscosity, and surface tension of the resulting olive O/W emulsions...
August 15, 2012: Journal of Agricultural and Food Chemistry
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