Non-Fiction Books:

Anti-Obesity Properties of Selected Phytochemicals in Cell Culture and Animal Models

Format

Paperback

Customer rating

Click to share your rating 0 ratings (0.0/5.0 average) Thanks for your vote!

Share this product

Anti-Obesity Properties of Selected Phytochemicals in Cell Culture and Animal Models by Huiyuan Tan
Unavailable
Sorry, this product is not currently available to order

Description

This dissertation, "Anti-obesity Properties of Selected Phytochemicals in Cell Culture and Animal Models" by Huiyuan, Tan, 谭惠元, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Obesity, as a widespread epidemic disease, is one of the main health risks worldwide. Extensive studies have therefore been conducted to explore preventive and healing strategies. One promising approach is to seek naturally occurring components with anti-obesity properties. Phytochemicals are chemical compounds derived from natural plants and many of them have been verified to possess anti-obesity activities. In this thesis, I study five phytochemicals (oxyresveratrol, cyanomaclurin, cynarin, pseudoprotodioscin and 5-hydroxytryptophan) for their anti-obesity properties, whose bioactivities in obesity resistance are previously unexplored. Firstly, in vitro studies with 3T3-L1 cells were conducted to identify the efficacy of these five phytochemicals in suppressing adipogenesis. Adipogenesis is a progress through which mesenchymal stem cells develop into mature adipocytes. The exposure of oxyresveratrol (0-100 μM), cyanomaclurin (0-600 μM) or 5-hydroxytryptophan (0-400 μM) led to a dose-dependent decrease in triglyceride accumulation of 3T3-L1 cells. Their effects in suppressing adipogenesis were attributed in part to the induction of cell cycle arrest by retaining preadipocytes in the G1 phase during the first two days post-confluent through regulating cyclin D1, cyclin-dependent kinase 4 (CDK4) and cyclin-dependent kinase inhibitor 1B (P27/kip1) expressions. Their anti-adipogenic properties might also be induced by restraining major transcriptional factors expression in adipogenesis including peroxisome proliferator-activated receptor γ (PPARγ) and CCAAT/Enhancer-binding proteins α (C/EBPα). After preliminary in vitro search, oxyresveratrol was further examined for its anti-obesity effect in C57bl/6 mice. Male C57bl/6 mice were randomly assigned to control (5% fat by weight), high-fat (30% fat by weight) and high-fat supplemented with 0.25% and 0.5% oxyresveratrol diet groups for 8 weeks. Oxyresveratrol effectively ameliorated obesity-associated symptoms in mice, such as insulin resistance, hepatic steatosis and hyperglycemia. Study on specific mRNA and protein expressions in liver suggested that the anti-obesity effect of oxyresveratrol is presumably attributed to stimulating sirtuin 1 (SIRT1) expression to relieve insulin resistance in liver, suppressing glucose-6-phosphatase (G6Pase) expression and promoting AMP-activated protein kinase α2 (AMPKα2) level to decease hepatic glucose synthesis, as well as restraining sterol regulatory element-binding proteins 1 (SREBP-1), fatty acid synthase (FAS) and C/EBPα expression, and increasing AMPKα2 level to inhibit hepatic fatty acids synthesis. I further examined critical mRNA expressions in visceral fat, muscle and brain. Results showed that the anti-obesity effect of oxyresveratrol might also be induced by its regulation on glucose and lipid homeostasis in adipose tissue and muscle. Oxyresveratrol supplementation stimulated insulin sensitivity in adipose tissue and muscle by up-regulating insulin receptor substrate 1 (IRS-1) and/or glucose transporter type 4 (GLUT4) expressions in these tissues. This effect might promote blood glucose uptake into adipocytes and muscle cells, contributing to the reduced serum glucose level. Also, oxyresveratrol might promote metabolic fitness in high-fat diet-fed mice by raising adiponectin level in adipose tissue and elevating the expressions of SIRT1, AMPKα, peroxisome
Release date NZ
January 26th, 2017
Author
Contributor
Created by
Country of Publication
United States
Illustrations
colour illustrations
Imprint
Open Dissertation Press
Dimensions
216x279x9
ISBN-13
9781361043073
Product ID
26646132

Customer reviews

Nobody has reviewed this product yet. You could be the first!

Write a Review

Marketplace listings

There are no Marketplace listings available for this product currently.
Already own it? Create a free listing and pay just 9% commission when it sells!

Sell Yours Here

Help & options

  • If you think we've made a mistake or omitted details, please send us your feedback. Send Feedback
  • If you have a question or problem with this product, visit our Help section. Get Help
Filed under...

Buy this and earn 691 Banana Points