Fatty Acids, Genes and Microbiota in Fatty Liver
2016年5月10日 更新者：Johane Allard
Non-alcoholic Steatohepatitis Versus Simple Hepatic Steatosis: Is There a Difference in the Nutritional Factors Influencing Lipid Perioxidation and Inflammation?
The first aim of this study is to assess oxidative stress and nutritional status in patients with elevated liver enzymes who were found to have either simple steatosis (SS) or nonalcoholic steatohepatitis (NASH) or normal histological findings on liver biopsy by measuring liver lipid peroxides and tumor necrosis factor (TNF)-α, liver pathology and immunohistochemistry, liver function tests, liver and red blood cell membrane fatty composition, insulin resistance (IR) parameters, plasma lipid peroxides, plasma antioxidant vitamins and antioxidant power, lipid profile, subject demographics, medical history and medication use.
The second aim is to detect differences in hepatic gene expression (messenger RNA, mRNA) and epigenetic regulation (micro RNA, miRNA) between patients with SS or NASH and healthy controls, in addition to determine in patients with non-alcoholic fatty liver disease (NAFLD = SS+NASH combined) whether there is an association between hepatic n-3 PUFA content and gene expression.
The third aim is to determine the intestinal microbiome (microbial composition and metagenome) in patients with SS or NASH and healthy controls.
調査の概要
状態
完了
詳細な説明
NASH is associated with obesity, diabetes and hyperlipidemia. Fat accumulation in the liver is likely due to variable degrees of disordered fatty-acid metabolism and insulin resistance (IR). Liver steatosis, especially polyunsaturated fatty acids (PUFA) in the liver, increases lipid peroxidation and is associated with a reduction in the antioxidant defense system. This oxidative stress can lead to increased production of pro-inflammatory cytokines (TNF-α, transforming growth factor-beta) contributing to the development of steatohepatitis and fibrosis.TNF-α - may further contribute to IR. In addition, changes in fatty acid composition within the liver may influence lipid metabolism and inflammation. In particular, n-3 PUFA have an effect on the insulin sensitivity, transcription of antioxidant genes, inflammatory response and production of reactive oxygen species. Differences might be seen on the gene expression level (mRNA) and also in epigenetic regulation (miRNA).
Microbiota composition might influence energy metabolism, and inflammatory tone and IR through increased endotoxemia and therefore could also play a role in the development of NAFLD.
研究の種類
観察的
入学 (実際)
205
連絡先と場所
このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。
研究場所
-
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Ontario
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Toronto、Ontario、カナダ、M5G 1Z5
- Toronto General Hospital
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参加基準
研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。
適格基準
就学可能な年齢
18年～70年 (大人、高齢者)
健康ボランティアの受け入れ
いいえ
受講資格のある性別
全て
サンプリング方法
非確率サンプル
調査対象母集団
Healthy living liver donors from the Multiorgan transplant program at the University Health Network Patients with nonalcoholic fatty liver disease (SS or NASH on liver biopsy) or patients with elevated liver enzymes but no significant findings on liver biopsy.
説明
Inclusion criteria:
- Male and female patients, age >18 y
- A liver biopsy with a diagnosis of SS or NASH OR No signs of steatosis, fibrosis or any other kind of liver disease on histology (minimal findings) OR For healthy control subjects, those with normal liver enzymes and normal liver imaging on ultrasound
- alcohol consumption (<20g of ethanol per day);
- absence of any other possible cause for liver dysfunction.
Exclusion criteria:
- any other liver disease apart from NAFLD
- anticipated need for liver transplantation in one year or complications of liver disease;
- any reasons contraindicating a liver biopsy (patients) or liver donation (healthy donors)
- chronic gastrointestinal diseases, previous gastrointestinal surgery modifying the anatomy, patients with diabetes requiring insulin.
- medications known to precipitate steatohepatitis (corticosteroids, high dose estrogens, methotrexate, amiodarone, spironolactone, sulfasalazine, perhexiline maleate, diethylamino- ethoxyhexestrol (DH), tamoxifen, diethylstilbestrol, naproxen or oxacillin) or regular intake of non-steroidal anti-inflammatory drugs (except for low dose aspirin), use of ursodeoxycholic acid or any experimental drug in the 6 months prior to entry.
- regular intake of prebiotics, probiotics, antibiotics, or laxatives; in the 3 months prior to study entry
- Pregnant or lactating
研究計画
このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。
研究はどのように設計されていますか？
デザインの詳細
- 観測モデル：コホート
- 時間の展望：断面図
コホートと介入
グループ/コホート |
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Healthy controls
Healthy living liver donors with healthy liver on imaging and/or liver histology
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Simple steatosis
Patients with non-alcoholic fatty liver disease confirmed by liver biopsy with a diagnosis of simple steatosis
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Nonalcoholic steatohepatitis
Patients with non-alcoholic fatty liver disease confirmed by liver biopsy with a diagnosis of steatohepatitis
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Minimal findings
Patients undergoing liver biopsy because of suspected fatty liver but nonspecific findings on liver histology.
This group was initially used as a control group.
Later in the study, this group was replaced by healthy donors as true healthy controls.
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この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Hepatic fatty acid composition in total lipids in liver biopsy
時間枠：Baseline
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Gas chromatography
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Baseline
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Hepatic gene expression
時間枠：Baseline
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mRNA by microarray
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Baseline
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Intestinal microbiota composition
時間枠：Baseline
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Illumina 16S technology
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Baseline
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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Lipid peroxides in the liver
時間枠：Baseline
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Test kit
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Baseline
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Hepatic liver antioxidant power
時間枠：Baseline
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Test kit
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Baseline
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Hepatic microRNA expression in the liver
時間枠：Baseline
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NanoString
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Baseline
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Intestinal microbiota - specific organisms and groups
時間枠：Baseline
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Quantitative real-time polymerase chain reaction
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Baseline
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Intestinal microbiome on a genetic level
時間枠：Baseline
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Illumina sequencing technology
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Baseline
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Short-chain fatty acids in stool
時間枠：Baseline
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Gas chromatography
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Baseline
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Plasma endotoxin
時間枠：Baseline
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Limulus assay
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Baseline
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その他の成果指標
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Hepatic phospholipid composition
時間枠：Baseline
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Gas chromatography
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Baseline
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Red blood cell fatty acid and phospholipid composition
時間枠：Baseline
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Gas chromatography
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Baseline
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Plasma fatty acid composition
時間枠：Baseline
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Gas chromatography
|
Baseline
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Plasma lipid peroxides
時間枠：Baseline
|
Test kit
|
Baseline
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Plasma antioxidant vitamins
時間枠：Baseline
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Vitamin C colorimetric, alpha- and gamma-tocopherol and beta-carotene by high-performance liquid chromatography
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Baseline
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Serum antioxidant power
時間枠：Baseline
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Test kit
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Baseline
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TNF-alpha in the liver
時間枠：Baseline
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Enzyme linked immunosorbent assay
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Baseline
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Immunohistochemistry
時間枠：Baseline
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Staining for malondialdehyde, alpha-smooth muscle actin, transforming growth factor beta
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Baseline
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Free choline in serum
時間枠：Baseline
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liquid chromatography/electrospray ionization-isotope dilution mass spectrometry (LC/ESI-IDMS)
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Baseline
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Bacterial DNA in plasma
時間枠：Baseline
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Quantitative polymerase chain reaction for bacterial 16S rDNA
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Baseline
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Insulin resistance
時間枠：Baseline
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Fasting glucose and insulin to calculate insulin resistance (HOMA-IR), C-peptide, hemoglobin A1c, all by standard laboratory methods
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Baseline
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Plasma ethanol
時間枠：Baseline
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standard laboratory measurement
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Baseline
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Anthropometry
時間枠：Baseline
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Weight, height, skinfolds, bioelectrical impedance analysis
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Baseline
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Food intake
時間枠：Baseline
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7-day food records
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Baseline
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Physical activity
時間枠：Baseline
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7 day activity logs
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Baseline
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Factors influencing intestinal microbiota
時間枠：Baseline
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Environmental questionnaire
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Baseline
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Liver function tests
時間枠：Baseline
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Alanine transaminase, aspartate transaminase, alkaline phosphatase, standard laboratory tests
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Baseline
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協力者と研究者
ここでは、この調査に関係する人々や組織を見つけることができます。
スポンサー
協力者
捜査官
- 主任研究者：Johane Allard, MD,FRCPC、University Health Network, Toronto
出版物と役立つリンク
研究に関する情報を入力する責任者は、自発的にこれらの出版物を提供します。これらは、研究に関連するあらゆるものに関するものである可能性があります。
一般刊行物
- Schwenger KJ, Allard JP. Clinical approaches to non-alcoholic fatty liver disease. World J Gastroenterol. 2014 Feb 21;20(7):1712-23. doi: 10.3748/wjg.v20.i7.1712.
- Monteiro J, Leslie M, Moghadasian MH, Arendt BM, Allard JP, Ma DW. The role of n - 6 and n - 3 polyunsaturated fatty acids in the manifestation of the metabolic syndrome in cardiovascular disease and non-alcoholic fatty liver disease. Food Funct. 2014 Mar;5(3):426-35. doi: 10.1039/c3fo60551e.
- Mouzaki M, Allard JP. The role of nutrients in the development, progression, and treatment of nonalcoholic fatty liver disease. J Clin Gastroenterol. 2012 Jul;46(6):457-67. doi: 10.1097/MCG.0b013e31824cf51e.
- Mouzaki M, Allard J. Non-alcoholic steatohepatitis: the therapeutic challenge of a global epidemic. Ann Gastroenterol. 2012;25(3):207-217.
- Da Silva HE, Arendt BM, Noureldin SA, Therapondos G, Guindi M, Allard JP. A cross-sectional study assessing dietary intake and physical activity in Canadian patients with nonalcoholic fatty liver disease vs healthy controls. J Acad Nutr Diet. 2014 Aug;114(8):1181-94. doi: 10.1016/j.jand.2014.01.009. Epub 2014 Mar 14.
- Arendt BM, Ma DW, Simons B, Noureldin SA, Therapondos G, Guindi M, Sherman M, Allard JP. Nonalcoholic fatty liver disease is associated with lower hepatic and erythrocyte ratios of phosphatidylcholine to phosphatidylethanolamine. Appl Physiol Nutr Metab. 2013 Mar;38(3):334-40. doi: 10.1139/apnm-2012-0261. Epub 2012 Oct 15.
- Mouzaki M, Comelli EM, Arendt BM, Bonengel J, Fung SK, Fischer SE, McGilvray ID, Allard JP. Intestinal microbiota in patients with nonalcoholic fatty liver disease. Hepatology. 2013 Jul;58(1):120-7. doi: 10.1002/hep.26319. Epub 2013 May 14.
- Allard JP, Aghdassi E, Mohammed S, Raman M, Avand G, Arendt BM, Jalali P, Kandasamy T, Prayitno N, Sherman M, Guindi M, Ma DW, Heathcote JE. Nutritional assessment and hepatic fatty acid composition in non-alcoholic fatty liver disease (NAFLD): a cross-sectional study. J Hepatol. 2008 Feb;48(2):300-7. doi: 10.1016/j.jhep.2007.09.009. Epub 2007 Nov 20.
- Arendt BM, Comelli EM, Ma DW, Lou W, Teterina A, Kim T, Fung SK, Wong DK, McGilvray I, Fischer SE, Allard JP. Altered hepatic gene expression in nonalcoholic fatty liver disease is associated with lower hepatic n-3 and n-6 polyunsaturated fatty acids. Hepatology. 2015 May;61(5):1565-78. doi: 10.1002/hep.27695. Epub 2015 Feb 27.
- Pettinelli P, Arendt BM, Schwenger KJP, Sivaraj S, Bhat M, Comelli EM, Lou W, Allard JP. Relationship Between Hepatic Gene Expression, Intestinal Microbiota, and Inferred Functional Metagenomic Analysis in NAFLD. Clin Transl Gastroenterol. 2022 Jul 1;13(7):e00466. doi: 10.14309/ctg.0000000000000466. Epub 2022 Feb 10.
研究記録日
これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。
主要日程の研究
研究開始
2003年10月1日
一次修了 (実際)
2015年8月1日
研究の完了 (実際)
2015年8月1日
試験登録日
最初に提出
2014年5月23日
QC基準を満たした最初の提出物
2014年5月23日
最初の投稿 (見積もり)
2014年5月28日
学習記録の更新
投稿された最後の更新 (見積もり)
2016年5月12日
QC基準を満たした最後の更新が送信されました
2016年5月10日
最終確認日
2016年5月1日
詳しくは
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いいえ
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いいえ
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